Patent Description:
Delivering medicine to a user, specifically insulin delivery, plays an important role in the prevention and treatment of diseases, in particular in the treatment of diabetes mellitus. Besides using injection pens or syringes, insulin delivery may specifically be performed by using insulin pumps.

In particular, a user is generally required to wear the insulin pump on his or her body at all times, thus leading to a preferably small and compact construction of the insulin pump and its components. Common pumps for delivering medicine, such as for example insulin, comprise a plurality of medicine reservoirs. As an example, fluid delivery devices are disclosed in <CIT>. The fluid delivery device comprises a housing having a fluid reservoir. A needle is in fluid communication with the fluid reservoir in an engaged position and out of fluid communication with the fluid reservoir in armed and storage positions. A proximal end of a biasing member is coupled to the housing and a distal end of the biasing member is configured to deliver a force to the fluid reservoir. A piston member extends through the biasing member and is coupled to the distal end of the biasing member. The piston member is fixed with respect to the housing in a locked position such that the biasing member does not deliver the force to the fluid reservoir and the piston member is moveable with respect to the housing in a released position such that the biasing member delivers the force to the fluid reservoir. Transitioning the needle from the storage position to the armed position transitions the piston from the locked position to the released position.

<CIT> describes medical devices which are adapted for application to a skin surface of a user and comprise a transcutaneous device which is supplied in a sterile condition. Thus, a medical device is provided, comprising a mounting surface adapted for application to the skin of a subject, a first portion having a first end adapted to penetrate the skin of the subject, and a second portion in fluid communication with the first portion and having a second end. The device further comprises enclosure means being transformable from an initial configuration encapsulating the first and second portions in an initial aseptic state, to a second configuration in which the ends of the first and second portions are allowed to communicate with the exterior through the enclosure means, wherein the enclosure means does not enclose the mounting surface.

<CIT> describes a medical device for transcutaneously inserting an insertable element into a body tissue is disclosed. The medical device comprises: at least one insertable element, wherein the insertable element comprises at least one in vivo distal end for subcutaneous insertion and at least one ex vivo proximal end; at least one insertion cannula for subcutaneously inserting the insertable element, the insertion cannula having a lumen which fully or partially is enclosed by a wall of the insertion cannula, wherein the insertable element is received in the lumen, wherein the insertion cannula is a pre-bended insertion cannula. The medical device further comprises at least one patch which is configured to be mounted onto a skin of a user. The patch comprises a patch base. The patch comprises an integrated insertion mechanism for driving the insertion cannula from a storage position within the patch into an inserted position within the body tissue on a curved insertion path.

Another device for delivering fluid to a patient is known from <CIT>.

Despite the advantages of state of the art pumps for delivering insulin, several technical challenges remain. Commonly, the cannula is inserted via a separate insertion unit or via electro mechanics which are positioned within a patch. However, due to the external insertion unit, there is an external interface and additional handling steps are required. In case electro mechanics are applied, there is an increased manufacturing effort which leads to increased costs.

It is therefore an objective of the present invention to provide a medical device for transcutaneously inserting a cannula into a body tissue, a medication device for delivering at least one medication to a user and a method for transcutaneously inserting a cannula into a body tissue, which at least partially avoid the shortcomings of known devices and methods of this kind and which at least partially address the above-mentioned challenges. Specifically, devices and methods shall be disclosed which allow for easy manufacturing and simple handling processes by a user.

This problem is addressed by a medical device for transcutaneously inserting a cannula into a body tissue, a medication device for delivering at least one medication to a user and a method for transcutaneously inserting a cannula into a body tissue with the features of the independent claims. Advantageous embodiments which might be realized in an isolated fashion or in any arbitrary combinations are listed in the dependent claims.

Further, it shall be noted that the terms "at least one", "one or more" or similar expressions indicating that a feature or element may be present once or more than once, typically will be used only once when introducing the respective feature or element.

The terms "patient" and "user" as used herein are broad terms and are to be given their ordinary and customary meaning to a person of ordinary skill in the art and are not to be limited to a special or customized meaning. The terms specifically may refer, without limitation, to a human being or an animal, independent from the fact that the human being or animal, respectively, may be in a healthy condition or may suffer from one or more diseases. As an example, the patient or the user may be a human being or an animal suffering from diabetes. However, additionally or alternatively, the invention may be applied to other types of users or patients or diseases.

The term "body tissue" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to a cellular organizational level intermediate between cells and a complete origin. The body tissue may specifically be an ensemble of similar cells from the same origin that together carry out a specific function. Thereby, organs may then be formed by functional grouping together of multiple tissues. As an example for body tissue, interstitial tissue, i.e. connective tissue between cellular elements if a structure, may be named.

In a first aspect of the present invention, a medical device for transcutaneously inserting a cannula into a body tissue is disclosed. The medical device comprises at least one cannula. The cannula comprises a lumen which is fully or partially enclosed by a wall of the cannula. Further, the medical device comprises at least one patch configured to be mounted onto a skin of a user. The patch comprises at least one patch base. The patch further comprises at least one integrated insertion mechanism for driving the cannula from a storage position within the patch into an inserted position within the body tissue. The patch further comprises at least one reservoir configured for storing at least one therapeutical medical fluid. Further, the integrated insertion mechanism is a spring driven insertion mechanism.

The term "medical device" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary device configured for conducting at least one medical procedure. The medical device therefore generally may be an arbitrary device configured for performing at least one therapeutic purpose. The medical device specifically may comprise one component or an assembly of two or more components capable of interacting with each other, such as in order to perform one or more therapeutic purposes, such as in order to perform the medical procedure. The medical device generally may also be or may comprise at least one of a medical system or a medical kit. The medical device generally may be used for delivering at least one medication such as a drug and/or a therapeutic agent to a user. Thus, the medical device may be used as part of one or more medical treatments.

The medical device may specifically be a disposable medical device. The term "disposable" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to the property of a component or an element to be disposed of after use. Thus, the disposable element or component may be designed to be irreversibly altered or even destroyed during use, such as by mechanical deformation or by irreversible separation of components of the disposable element. Thus, the disposable element may be configured to be disposed of after use. Thus, this component may be made of at least one material which specially may be low priced and/or easily recyclable. Still, other embodiments are feasible.

The medical device may be provided in a sterile packaging before usage. The term "packaging" may refer to an arbitrary object which is configured for fully or partially enclosing or encasing at least one other component, wherein the at least one other component, as an example, may be a component which requires protection, such as mechanical protection and/or protection against moisture and/or microbial contaminations. The term "sterile" may generally refer to a property of an arbitrary object of being at least to a large extent free from all forms of life and/or other biological agents such as prions, viruses, fungi, bacteria or spore forms. Thus, the sterile object may be treated by at least one sterilization process that one or more of reduces, eliminates or deactivates the forms of life and/or of the other biological agents.

The term "transcutaneous" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to a property of an arbitrary element of being adapted to be fully or at least partly arranged through the body tissue of the patient or the user. For this purpose, the element may comprise an insertable portion. In order to further render the element to be usable as a transcutaneous element, the element may fully or partially provide a biocompatible surface, i.e. a surface which, at least during durations of use, does not have any detrimental effects on the user, the patient or the body tissue. Further, the transcutaneous element generally may be dimensioned such that a transcutaneous insertion of the element into the body tissue is feasible, such as by providing a width in a direction perpendicular to an insertion direction of no more than <NUM>, preferably of no more than <NUM>, more preferably of no more than <NUM>. Thus, the term "subcutaneous" may generally refer to a property of an arbitrary element of being situated or lying under the skin and within the body tissue of the user or the patient. Specifically, the object may be configured to be introduced under the skin, exemplarily as an injection
The term "cannula" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary element which may be insertable at least partially into an arbitrary body tissue, particularly in order to deliver or to transfer a further element. Therefore, the cannula may specifically be or may comprise a hollow tube or a hollow needle.

As described above, the cannula has a lumen which is fully or partially enclosed by a wall of the cannula. The term "lumen" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an interior volume of an arbitrary element. The interior volume may specifically be an open interior volume. Thus, the interior volume may not be fully enclosed or surrounded by a wall of the element. Instead, a flow of a fluid medium or an insertion of another object from one end of the element to a further end through the lumen may be feasible.

The term "wall" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary structure, specifically a structural material, which is configured to at least partially surround another object or volume thereby defining physical limits of an object. Further, the wall may be configured to protect the volume or the other object at least partially enclosed by the wall.

Specifically, the cannula may be selected from the group consisting of: a closed cannula with the wall circumferentially enclosing the lumen; The term "circumferentially enclosing" may generally refer to a property of an arbitrary object or volume of being fully enclosed by another object in at least two dimensions. Specifically, the lumen of the cannula may be fully enclosed by the cannula in directions perpendicular to a direction of extension of the cannula.

The cannula may be selected from the group consisting of: an insertion cannula for inserting an infusion cannula; an infusion cannula. The term "infusion cannula" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary cannula being configured to introduce an infusion, i.e. a liquid substance, specifically a liquid substance comprising a medicine, into the body tissue, exemplarily directly into a vein of the patient. Therefore, the infusion cannula may be attached to a reservoir comprising the liquid substance, specifically via the ex vivo proximal end of the infusion cannula. The infusion cannula may be part of an infusion kit. The term "infusion kit" may refer to an assembly of components which are required for a conduction of an arbitrary infusion. Thus, besides of the infusion cannula, the infusion kit may further comprise at least one fluid coupling for coupling the infusion kit to at least one medication device, preferably to at least one medication pump.

Alternatively, the cannula may be an insertion cannula for inserting an infusion cannula. The insertion cannula may specifically be an injection needle. the injection needle may be arranged within a lumen of a soft cannula and the injection needle may be removed after insertion of the soft cannula, e.g. the soft cannula, which is configured to stay at least partially within the body tissue and to stay within the body tissue during the useful lifetime of the medical device. The term "soft cannula" may refer to an arbitrary cannula which is at least partially made of at least one soft, e.g. elastic material. The elastic material may specifically comprise at least one elastic material. Thus, the soft cannula may be or may comprise a flexible tube. Meanwhile, the injection needle may stay outside of the body tissue but may be incorporated within the medical device. Specifically, the injection needle may be protectively enclosed by the medical device such that the injection needle may not be a source of risk to the user or the patient. Thus, the user or the patient may have the injection needle protectively enclosed by the medical device, specifically by a housing of the medical device, attached to the body tissue via medical device. Thus, the injection needle and the soft cannula may be configured to be removed from the body of the patient at the same time after the useful expiration time of the medical device is expired.

The cannula may at least partially be made of at least one biocompatible material, i.e. a surface which, at least during durations of use, does not have any detrimental effects on the user, the patient or the body tissue. The cannula, specifically the infusion cannula, may be at least partially made of steel, specifically stainless steel. The steel, specifically the stainless steel may be biocompatible. Further, by applying the steel, specifically the stainless steel, a rigid infusion cannula may be provided. However, other materials may be feasible, such as a plastic material.

The cannula may be a pre-bended cannula. The term "pre-bended" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to a geometrical property of an element which, at least in absence of external forces, is an at least partially non-straight shape. Thus, the insertion cannula, at least in absence of external forces, may be at least partially non-straight. Thus, the cannula specifically may fully or partially be embodied as having a non-straight saying, specifically fully or partially be embodied as having a curved shape. Specifically, the cannula may fully or partially be embodied as having the shape of a segment of a circle. Thus, specifically, the cannula may be pre-bended in such a way that it fully or partially has the shape of a segment of a circle. More specifically, as an example, the pre-bended cannula may be a steel cannula, specifically a stainless steel cannula, being pre-bended in such a way that it is fully or partially curved, specifically having the shape of a segment of a circle.

The cannula may comprise at least one curvature. Thereby, parts of the cannula such as one end of the cannula may be arranged in an angle relative to the major axis. Specifically, the cannula may have an angle of <NUM>° to <NUM>°, preferably of <NUM>° to <NUM>°, more preferably of <NUM>°, to the major axis. Specifically, the second shape configuration may correspond to an arch form of the cannula. The arch form may specifically refer to a state of the cannula, wherein the cannula may be curved such that one part of the cannula, specifically one end of the cannula, more specifically one end of the cannula comprising the in vivo distal end of the insertable element, sticks out from the major axis. Thereby, the curvature may preferably be, at least to a large extent, free from bends.

The infusion cannula may be configured to be removed from the body tissue subsequent to an expiration of a useful lifetime of the medical device. The term "useful lifetime" may refer to a period of time during which an arbitrary device may be applied in an intended manner. Specifically, the medical device may be configured to stay mounted onto the skin of the patient or the user for several days such as for two to four days. During this period of time, the medical device may be configured to transfer an infusion into the body tissue as will further be described below. Further, during this period of time, the cannula may stay within the body tissue.

The term "patch" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to a device which is attachable to a skin or a skin site of a user or a patient. Thus, the patch may comprise at least one attachment component which is capable of connecting the body mount to the skin, such as at least one adhesive surface and/or at least one adhesive strip or plaster. Thus, the term "mounting" specifically may refer, without limitation, to an arbitrary process of fixing or attaching an element to an object. The attachment may be a permanent attachment, e.g. the element and the object may have a permanent connection to each other which may not be disconnected when the unit of the element and the object is bent or when a mechanical stress is applied to the element and/or to the object.

As outlined above, the patch comprises the patch base. As further used herein, the term "base" refers to an arbitrary support of an object on which further components of the object rest. Thereby, the base may have a supporting surface serving bearing area for the further components. Specifically, the patch base may be a flat element. The patch base may comprise a bottom surface facing the body tissue of the user or the patient. The bottom surface may be the adhesive surface as described above. Further, the patch base may comprise an upper surface. The upper surface may be configured as bearing surface and may be configured to serve as a host for further components of the medical device. Therefore, the patch may also be referred to a body mount. The patch base may comprise at least one passage opening. The cannula may be movable from the patch into the body tissue through the passage opening. A shape of the passage opening may correspond to a shape of the cannula.

The term "reservoir" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to a hollow element or container which may fully or partially be fillable with a fluid such as with a drug and/or a therapeutic agent. Specifically, the reservoir may be fillable with insulin. The reservoir may be removably placable within the medical device. Specifically, the insertion cannula may be the infusion cannula as described above and the reservoir may be configured for releasing the therapeutical medical fluid via the cannula. The reservoir may comprise at least one cartridge or vial. The vial may have a cylindrical shape. The reservoir may be a vial, specifically a rigid vial.

The medical device may further comprise at least one further reservoir configured for storing and releasing at least one further therapeutical medical fluid. The reservoir and the further reservoir may be arranged next to each other. Thus, the reservoir and the further reservoir may be arranged in a space saving manner. The medical device may further comprise at least one mixing device. The mixing device may comprise at least one static mixer. The mixing device may be configured for mixing the therapeutical medical fluid of the reservoir and the further therapeutical medical fluid of the further reservoir such that a mixture is formed before the mixture is applied to the user via the cannula.

The medical device may further comprise at least one piston, specifically at least one piston rod. The piston may be configured to displace the therapeutical medical fluid of the reservoir. The term "piston" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary moving component that is contained by a cylinder and is made, at least to a large extent, gas-tight and/or water-tight by piston rings. In a pump, the piston may be configured to transfer a force from a crankshaft to a cylinder for the purpose of compressing or ejecting a fluid in the cylinder. The term "displacement" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to a process of reducing a free volume of a defined interior space. Thus, by reducing the free volume, a part of a fluid which is received within the defined interior space may leave the interior space. e.g. the fluid may be released from the interior volume.

The medical device may further comprise at least one drive spindle. The drive spindle may be operably connectable to at least one medication pump. The term "drive spindle" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary rotatable axis which is configured to urge another element in a desired direction preferably by pushing or pulling the other element. Specifically, the drive spindle may be configured for pushing or pulling the other element in a linear manner. As described above, the medical device may comprise the at least one piston. The medication pump may be configured to move the piston via the drive spindle. Thus, by rotating the drive spindle, the piston may displace the therapeutical fluid of the reservoir.

The term "insertion mechanism" may generally refer to an assembly of components which are configured to interact with each other with the purpose of inserting an element at least partially into another object. Therefore, the insertion mechanism may be configured such that a movement of the element in a direction of insertion, i.e. toward a surface of the other object, is introduced. The insertion mechanism may be an integrated insertion mechanism. The term "integrated insertion mechanism" may refer to an assembly of the components which are configured to interact with each other with the purpose of inserting the element at least partially into another object, wherein the assembly of the components is provided as one unit, as a whole and/or as an "all-in-one" system. Thus, the user may find the medical device comprising a fully assembled insertion mechanism without the need to add other components to the medical device or the need to apply a further device in addition to the medical device for the purpose of inserting the cannula into the body tissue. Further, optionally, the integrated insertion mechanism may be also configured for subsequently driving the cannula back from the inserted position into the storage position. However, the medical device may also be configured for removing the medical device from the body tissue while the cannula is in the inserted position as further described below in more detail.

The term "storage position" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to a position of the cannula within the patch, in which the cannula does not protrude into the body tissue. Specifically, the cannula may be fully or partially surrounded by the patch. The term "inserted position" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to a position of the cannula in which the cannula fully or partially protrudes from the patch, such as by fully or partially protruding into the body tissue, which preferably a proximal end of the cannula is fully or partially held by the patch or connected to the patch. In the storage position and in the inserted position, the cannula may have the same shape or may have a different shape. Exemplarily, the cannula may have the same bending radius or the same shape in the storage position.

The integrated insertion mechanism may be configured for driving the cannula into the body tissue of the user or the patient on a curved path. The term "on a curved path" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to the fact that a tip of the cannula, during movement from the storage position into the inserted position, follows a path which is at least partially non-straight. Specifically, the path may at least partially have the shape of a segment of a circle.

The term "spring driven insertion mechanism" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary insertion mechanism, wherein an interaction of an assembly of components for the purpose of inserting an element at least partially into another object is driven or triggered by a spring element. Thus, a force may be created by a spring, specifically by a force which is set free when a tensioned spring is released from a tensioned position. As a consequence, by releasing the spring from the tensioned position, the cannula may be urged in a direction of insertion, preferably by pushing or pulling the cannula.

The integrated insertion mechanism, specifically the spring driven insertion mechanism, may be a manual insertion mechanism. The term "manual insertion mechanism" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary insertion mechanism, wherein the insertion mechanism is triggered or conducted just by applying mechanical forces. The mechanical forces, e.g. a tensioning of the spring element as described above or as will further be described below in more detail, may be created by a manual procedure of the user or the patient, as will further be described below in more detail. Thus, the integrated insertion mechanism may be triggerable without a need of an electrical energy source. The medical device, specifically the patch base, may be connectable to at least one external element interacting with the cannula. The integrated insertion mechanism may be configured to be driven by a force established when connecting the external element to the medical device.

The integrated insertion mechanism comprises at least one drive unit configured for urging the cannula in a direction of insertion, preferably by pushing the cannula. The term "drive unit" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an element or an assembly of elements which are configured to interact with each other in order to create a force leading a movement, specifically a pre-determined movement, of another element. Specifically, the drive unit may be configured to urge the cannula in a direction of insertion, preferably by pushing or pulling the cannula. Specifically, the drive unit may be configured for moving in a direction of extension of the reservoir. Thus, the drive unit may at least partially surround the reservoir and may be configured to move along the reservoir.

The integrated insertion mechanism may be a sliding mechanism, preferably a linear sliding mechanism. The term "sliding mechanism" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary mechanism which is based on a linear sliding movement of two or more components relative to each other. Thereby, the term "sliding movement" may refer to a movement along a continuous connection with another element, specifically with a surface, more specifically of a smooth surface, of the other element. Specifically, the linear sliding mechanism may comprise one or more interacting sliding elements, such as one or more guide rails or the like. Further, the term "linear sliding movement" may generally refer to a movement along a straight line, e.g. within two dimensions.

The integrated insertion mechanism may further comprise at least one spring element. The term "spring element" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary elastic object which is used to store mechanical energy. In case an object may be coupled to the spring element, the spring element may be configured to be tensioned when the object is moved. Thereby, the spring element may be configured to move the object back to its original position when the spring element is relaxed. Specifically, the spring element may be configured to be tensioned before insertion of the cannula into the body tissue. Further, the spring element may be configured to support an insertion of the cannula into the body tissue. The spring element may exemplarily be a spiral spring element and/or a compression spring element.

Specifically, the spring element may be tensible parallel to a direction of insertion. The drive unit may be configured to compress the spring element as will further be described below in more detail. Thus, the spring element may be configured to relax in the direction of insertion, thereby pushing the cannula in the direction of insertion. Specifically, the reservoir may be at least partially received within the spring element. Further, the cannula may be at least partially received within the spring element. Thus, the components of the medical device may be arranged in a space saving manner and a construction size of the medical device may be reduced. The spring element may be configured to prevent at least to a large extent, a withdrawing of the cannula from the body tissue after insertion. Thus, in the inserted position, the cannula may be at least partially inserted into the body tissue. The spring element may be existent in a relaxed state, thereby applying a force on the cannula in a direction of insertion, specifically on an ex vivo end of the cannula.

Further, the medical device may comprise a decoupling of a movement of the cannula. The spring element may be configured to be tensioned parallel to a direction of insertion. Thus, the cannula may be flexible in the direction of insertion.

The integrated insertion mechanism further comprises at least one interlocking element configured for securing the drive unit in fixed position. The term "interlocking element" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to hold or secure an object in a certain position in order to prevent an undesired movement or separation from another element, specifically through an application of an inward pressure. The interlocking element is fixedly connected to the drive unit.

The interlocking element may comprise at least one first interlocking element component and at least one second interlocking element component, wherein the first interlocking element component and the second interlocking element component are at least partially made of an elastic material, wherein the first interlocking element component and the second interlocking element component are configured to form a mechanical connection, specifically a form-fit connection. The form-fit connection may be a releasable form-fit connection. The interlocking element has a snap closure. The term "snap closure" may refer to an arbitrary closure which engages via a snapping or clip mechanism. The clicking mechanism may be a one-way clip mechanism.

The medical device may further comprise at least one elongate element. The elongate element may extend in a direction transverse, particularly perpendicular to a direction of extension of the cannula. The cannula, specifically at least one end of the cannula, may be fixedly received within a receptacle of the elongate element. The patch base may comprise a sliding guide receptacle, preferably a linear sliding guide receptacle. The linear sliding guide receptacle may be configured for receiving a protrusion of the elongate element at least partially. The receptacle may specifically be part of the protrusion. The protrusion may be configured to slide within the linear sliding guide receptacle. The linear sliding guide receptacle may extend in a direction transverse, particularly perpendicular to a direction of extension of the cannula. The reservoir may be connectable to the cannula via at least one fluid channel. The fluid channel may exemplarily be a flexible tube. One end of the fluid channel may be received in the protrusion of the elongate element. Further, the ex vivo proximal end of the cannula may also be at least partially received within the protrusion of the elongate element. Thus, the protrusion may be configured to establish a fluid connection between the fluid channel, e.g. the reservoir, and the cannula.

The interlocking element may be configured to enclose the elongate element. Thus, before insertion, when the cannula is in the storage position, the interlocking element may be moved in a direction reverse the direction of insertion. Thus, the interlocking element may be opened, thereby enclosing the elongate element and establishing a fixed connection with the elongate element.

The integrated insertion mechanism may further comprise at least one release button. The release button may be an elongate element with a first end and a second end. The first end may have a receptacle. The receptacle may have a shape which corresponds to a shape of the elongate element. Exemplarily, the elongate element may be a cylinder having a round cross-section and the receptacle may have a round shape correspondingly. A second end of the release button may be located outside of the patch. Thus, the second end may be accessible for the user or the patient. The release button may be configured for holding the elongate element in a predetermined position and for subsequently releasing the elongate element. The release button may be configured to be pressed, thereby triggering the integrated insertion mechanism. Thus, the integrated insertion mechanism may be triggerable manually. However, other embodiments may be feasible. Exemplarily, the integrated insertion mechanism may be triggered as soon as the medical device and the external element are assembled. Thereby, the medical device may be arranged and fixedly applied on the skin site of the user prior to the assembly of the medical device and the external element. However, also other embodiments may be feasible. The integrated insertion mechanism may also be a button-free integrated insertion mechanism. Exemplarily, the integrated insertion mechanism may be triggered as soon as the external element is connected to the medical device.

In a further aspect of the present invention, a medication device for delivering at least one therapeutical medical fluid to a user is disclosed. The medication device comprises at least one first part. The first part comprises at least one medical device as described above or as will be described in further detail below. Further, the medication device comprises at least one second part. The second part comprises at least one medication pump fluidically connectable to the cannula. Further, the second part comprises at least one electronics unit. The medication device comprises at least one medical device as described above or as will further be described below.

The term "medication device" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary device which is configured to administer or deliver a drug and/or a therapeutic agent via a specific route of administration. Such devices are commonly used as part of one or more medical treatments. Specifically, the term "medication device" may refer to a device for administering insulin by using at least one pump.

The terms "first" and "second", as generally used herein for denoting components or elements, may be considered as nomenclature only, without numbering or ranking the named elements, without specifying an order and without excluding a possibility that several kinds of first parts and second parts may be present. Further, additional parts such as one or more third parts or elements may be present. The term "part" may refer to an arbitrary component of an object. The component may be configured for interacting with a further component of the object. Specifically, the first part and the second part of the medication device may be capable of interacting with each other, such as in order to perform one or more therapeutic purposes, such as in order to perform the medical procedure as outlined above. The first part may be a disposable component and the second part may be a reusable component. The second part and/or the first part may be a watertight component. Specifically, the medication device may be a watertight medication device. For this purpose, the second part may have one or more sealing elements which may be configured to be pressed against at least one surface of the first component. Thus, an interior formed by the first part and the second part may be enclosed in a watertight manner.

The term "medication pump" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary pump which is configured to move a drug and/or a therapeutic agent by mechanical action. Specifically, the medication pump may be an infusion pump which is configured to infuse an arbitrary medication into a patient's circulatory system. Generally, the infusion pump may be configured to be applied intravenously or subcutaneously. However, other applications are feasible. The medication pump may be a positive displacement pump. The positive displacement pump may be configured to move at least one piston of the medical device in a direction of extension of the reservoir, specifically via at least one drive spindle of the medical device.

The terms "fluidically coupled" or "fluidically connectable" may generally refer to a property of two or more elements such that an arbitrary fluid may be transferable between the two or more elements. The medication pump may specifically be an insulin pump. The term "insulin pump" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to a device for administering insulin by using at least one pump. The term "fluidically connectable" may thus also be referred to as "operably connectable", as far as a fluidic operation is concerned.

The term "electronics unit" as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning. The term specifically may refer, without limitation, to an arbitrary device having at least one electronic component. Specifically, the electronics unit may comprise at least one electronic component for one or more of performing a measurement with the sensor, performing a voltage measurement, performing a current measurement, recording sensor signals, storing measurement signals or measurement data, transmitting sensor signals or measurement data to another device. The electronics unit may specifically be embodied as a transmitter or may comprise a transmitter, for transmitting data. Other embodiments of the electronic components are feasible. The electronics unit may comprise at least one interconnect device, preferably a printed circuit board, more preferably a flexible printed circuit board. The electronics unit may specifically be configured for controlling and operating the medication pump. Further, the second part may comprise at least one energy storage device. The energy storage device may be part of the electronics unit. The energy storage device may be selected from the group consisting of: a battery, a rechargeable battery, an accumulator. Also other embodiments are feasible.

The first part and the second part may be configured to establish at least one mechanical connection, selected from the group consisting of: a form-fit connection, a press-fit connection. As used herein, the term "mechanical connection" generally refers to a connection of two or more components by mechanical holding forces. As an example, the mechanical connection may be or may comprise at least one of a form-fit or a force-fit connection. As further used herein, the term "releasable", in the context of the mechanical connection, generally refers to the fact that the mechanical connection may be brought from a disconnected state, also referred to as a non-mated state, into a connected state, also referred to as a mated state, and back into the disconnected state. Thus, the mechanical connection may be closed and released at will. Specifically, the mechanical connection may be releasable without using any tools, simply by manual action. As an example, for opening a connection between the first part and the second part, forces of no more than <NUM> N, such as of no more than <NUM> N, such as of no more than <NUM> N, may be required, which may be applied by one hand or even the fingers or fingertips of the user.

Specifically, the first part and the second part may be connectable via at least one linear sliding mechanism. The first part may comprise at lease one linear sliding receptacle and the second part may comprise at least one linear sliding guide rail or vice versa. The linear sliding receptacle and the linear sliding guide rails in conjunction may form a linear sliding connector configured for establishing a releasable mechanical connection between the first part and the second part. As further used herein, the terms "linear sliding receptacle" and "linear sliding guide rail" may refer to elements which are complementary to each other and which are configured to interact with each other in order to realize the linear sliding mechanism. Exemplarily, the linear sliding guide rail may be formed as a protrusion of the first part and the linear sliding receptacle may be the second part or vice versa. However, other embodiments may be feasible. The linear sliding guide rail and the linear sliding receptacle may be shaped complementary to each other. Exemplarily, the linear sliding receptacle and the linear guide rail may have an elongate shape and may extend along a longitudinal axis of the first part and/or of the second part. The linear sliding receptacle and the linear sliding guide rail in conjunction may form a linear sliding connector configured for establishing a releasable mechanical connection between the electronics unit and the patch. The term "linear sliding connector", also referred to as a linear sliding connection, may generally refer to an arbitrary connector or connection between two linear sliding contours. Therein, generally, one or both of the linear sliding contours involved may comprise at least one protrusion and, in a complementary fashion, the other one of the linear sliding contours may comprise at least one linear sliding groove or linear sliding slot in which the protrusion may be guided in order to form the linear sliding connection or linear sliding connector.

By connecting the first part and the second part, the interlocking element may be moved in a direction reverse the direction of insertion. Thus, the interlocking element may be opened, thereby enclosing the elongate element and establishing a fixed connection with the elongate element.

In a further aspect of the present invention a method for transcutaneously inserting a cannula into a body tissue is disclosed. The method comprises the method steps as given in the independent claims and as listed as follows. The method steps may be performed in the given order. However, other orders of the method steps are feasible. Further, one or more of the method steps may be performed in parallel and/or in a timely overlapping fashion. Further, one or more of the method steps may be performed repeatedly. Further, additional method steps may be present which are not listed.

Step b) may be performed before conducting step c). Alternatively, step b) may be performed after conducting step c).

The proposed medical device, the analyte measurement device, the medication device and the proposed method for transcutaneously inserting an insertable element into a body tissue provide many advantages over known devices and methods.

Commonly, the infusion cannula may be inserted via a separate insertion unit or via electro mechanics which are positioned within a patch. However, due to the external insertion unit, there is an external interface and additional handling steps are required. In case electro mechanics are applied, there is an increased manufacturing effort which leads to increased costs.

On the contrary, the medical device, the medication device and the method according to the present invention allow for easy manufacturing and simple handling processes by a user. Further, a necessity of utilizing a separate insertion unit may be avoided. Thus, additional mounting elements as well as an additional manufacturing process may be omitted.

Energy for inserting the cannula may be afforded via an insertion mechanism which is integrated within the patch. An electrical drive may not be necessary. The cannula may have an arch shape and may be arranged within the patch in a space saving manner. Further, the cannula may be a guided cannula and may only require a small opening within the patch base. Thus, an insertion of the cannula may be feasible with an only low deformation of the tissue of the user or the patient.

Further, the spring elements may be arranged within the patch in a space saving manner. Specifically, the reservoir may be arranged within an interior of the spring element or the cannula may be arranged within the interior of the spring element.

Further, after insertion, the cannula may be arranged centrally below the patch. Thus, the cannula may be able to move elastically during application of the medical device. As a consequence, a wearing comfort may be increased.

A handling effort of the user or the patient may be decreased as the second part, comprising the medication pump and the electronics unit, may serve as a slider for tensioning the spring element.

Through the watertight design of the medication device, the medication device does not need to be removed from the skin site of the user or the patient for doing the shower, taking a bath or swimming. The second part may be reusable and the battery may be exchanged by the user or the patient himself. Alternatively, the second part may have an accumulator and the second part may have a covering for a charging contact. Further, an inductive charging may be provided.

By applying a plurality of reservoirs such as by applying two of the reservoirs, the medical device may be designable in a flat manner. Further, by applying a plurality of reservoirs more than one kind of fluid may be applied.

Summarizing and without excluding further possible embodiments, the following embodiments may be envisaged:
The application refers, in a first embodiment, to a medical device for transcutaneously inserting a cannula into a body tissue, wherein the medical device comprises:.

wherein the patch further comprises at least one reservoir configured for storing at least one therapeutical medical fluid and wherein the integrated insertion mechanism is a spring driven insertion mechanism, wherein the integrated insertion mechanism (<NUM>) comprises at least one drive unit (<NUM>) configured for urging the cannula (<NUM>) in a direction of insertion, wherein the integrated insertion mechanism (<NUM>) further comprises at least one interlocking element (<NUM>) configured for securing the drive unit (<NUM>) in a fixed position, wherein the interlocking element (<NUM>) is fixedly connected to the drive unit (<NUM>), wherein the interlocking element (<NUM>) has a snap closure (<NUM>).

The application further refers to the medical device according to the preceding embodiment, wherein the medical device is a disposable medical device.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the integrated insertion mechanism is a sliding mechanism, preferably a linear sliding mechanism.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the at least one drive unit is configured for urging the cannula in the direction of insertion by pushing the cannula.

The application further refers to the medical device according to the preceding embodiment, wherein the drive unit is configured for moving in a direction of extension of the reservoir.

The application further refers to the medical device according to any one of the two preceding embodiments, wherein the drive unit at least partially surrounds the reservoir and is configured to move along the reservoir.

The application further refers to the medical device according to any one of the three preceding embodiments, wherein the medical device, specifically the patch base, is connectable to at least one external element, wherein the integrated insertion mechanism is configured to be driven by a force established when connecting the external element to the medical device.

The application further refers to the medical device according to any one of the four preceding embodiments wherein the integrated insertion mechanism further comprises at least one spring element.

The application further refers to the medical device according to the preceding embodiment, wherein the spring is tensible parallel to a direction of insertion.

The application further refers to the medical device according to the preceding embodiment, wherein the drive unit is configured to compress the spring element.

The application further refers to the medical device according to any one of the two preceding embodiments, wherein the reservoir is at least partially received within the spring element.

The application further refers to the medical device according to any one of the three preceding embodiments, wherein the cannula is at least partially received within the spring element.

The application further refers to the medical device according to any one of the four preceding embodiments, wherein the spring element is configured to push the cannula in a direction of insertion.

The application further refers to the medical device according to any one of the five preceding embodiments, wherein the spring element is configured to prevent at least to a large extent, a withdrawing of the cannula from the body tissue after insertion.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the interlocking element comprises at least one first interlocking element component and at least one second interlocking element component, wherein the first interlocking element component and the second interlocking element component are at least partially made of an elastic material, wherein the first interlocking element component and the second interlocking element component are configured to from a mechanical connection, specifically a form-fit connection.

The application further refers to the medical device according to the preceding embodiment, wherein the form-fit connection is a releasable form-fit connection.

The application further refers to the medical device according to any one of the five preceding embodiments, wherein the medical device further comprises at least one elongate element having at least one protrusion, wherein the cannula, specifically at least one end of the cannula, is fixedly received within a receptacle of the protrusion, wherein the interlocking element is configured to enclose the elongate element.

The application further refers to the medical device according to the preceding embodiment, wherein the integrated insertion mechanism further comprises at least one release button, wherein the release button is configured for holding the elongate element in a pre-determined position and for subsequently releasing the elongate element.

The application further refers to the medical device according to any one of the two preceding embodiments, wherein the patch base comprises a sliding guide rail, preferably a linear sliding guide rail, wherein the linear sliding guide rail is configured for receiving the protrusion at least partially, wherein the protrusion is configured to slide within the linear sliding guide rail.

The application further refers to the medical device according to any one of the three preceding embodiments, wherein the release button is configured to be pressed, thereby triggering the integrated insertion mechanism.

The application further refers to the medical device according to any one of the nine preceding embodiments, wherein the interlocking element has a clip mechanism, specifically a one-way clip mechanism.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the integrated insertion mechanism is triggerable manually.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the medical device further comprises at least one piston, specifically at least one piston rod, wherein the piston is configured to displace the therapeutical medical fluid of the reservoir.

The application further refers to the medical device according to the preceding embodiment, wherein the medical device further comprises at least one drive spindle, wherein the drive spindle is operably connectable to at least one medication pump; wherein the medication is configured to move the piston via the drive spindle.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the reservoir is connectable to the cannula via at least one fluid channel.

The application further refers to the medical device according to the preceding embodiment, wherein the fluid channel is a flexible tube.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the reservoir is a vial, specifically a rigid vial.

The application further refers to the medical device according to the preceding embodiment, wherein the vial has a cylindrical shape.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the cannula is at least partially made of at least one material selected from the group consisting of: steel, specifically stainless steel; a plastic material.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the cannula is a pre-bended cannula.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the cannula is an infusion cannula, wherein the reservoir is configured for releasing the therapeutical medical fluid via the cannula.

The application further refers to the medical device according to the preceding embodiment, wherein the cannula is pre-bended in such a way that the cannula at least partially has the shape of a segment of a circle.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the cannula is at least partially made of at least one biocompatible material.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the integrated insertion mechanism comprises at least one element configured to prevent at least to a large extent a withdrawing of the cannula from the body tissue after insertion.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the integrated insertion mechanism is configured for driving the cannula from a storage position within the patch into an inserted position within the body tissue on a curved insertion path.

The application further refers to the medical device according to the preceding embodiment, wherein the insertion path is at least partially shaped as a segment of a circle.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the patch base comprises at least one passage opening, wherein the cannula is movable from the patch into the body tissue through the passage opening.

The application further refers to the medical device according to the preceding embodiment, wherein a shape of the passage opening corresponds to a shape of the cannula.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the medical device further comprises at least one further reservoir configured for storing and releasing at least one further therapeutical medical fluid.

The application further refers to the medical device according to the preceding embodiment, wherein the reservoir and the further reservoir are arranged next to each other.

The application further refers to the medical device according to any one of the two preceding embodiments, wherein the medical device further comprises at least one mixing device, wherein the mixing device is configured for mixing the therapeutical medical fluid of the reservoir and the further therapeutical medical fluid of the further reservoir such that a mixture is formed before the mixture is applied to the user via the cannula.

The application further refers to the medical device according to any one of the three preceding embodiments, wherein the mixing device comprises at least one static mixer.

The application further refers to the medical device according to any one of the preceding embodiments, wherein the cannula is at least partially connected to the patch base and/or placed inside the patch base.

The application refers, in a further embodiment, to a medication device for delivering at least one therapeutical medical fluid to a user, wherein the medication device comprises:.

The application further refers to the medication device according to the preceding embodiment, wherein the second part, specifically the electronics unit, has at least one energy supply component, specifically a battery and/or an accumulator.

The application further refers to the medication device according to the preceding embodiment, wherein the first part is a disposable component and wherein the second part is a reusable component.

The application further refers to the medication device according to any one of the preceding embodiments referring to a medication device, wherein the second part further comprises at least one energy storage device.

The application further refers to the medication device according to the preceding embodiment, wherein the energy storage device is selected from the group consisting of: a battery, a rechargeable battery.

The application further refers to the medication device according to any one of the preceding embodiments referring to a medication device, wherein the first part and/or the second part is a watertight component.

The application further refers to the medication device according to any one of the preceding embodiments referring to a medication device, wherein the medication pump is a positive displacement pump.

The application further refers to the medication device according to the preceding embodiment, wherein the positive displacement pump is configured to move at least one piston of the medical device in a direction of extension of the reservoir, specifically via at least one drive spindle of the medical device.

The application further refers to the medication device according to any one of the preceding embodiments referring to a medication device, wherein the first part and the second part are configured to establish at least one connection, selected from the group consisting of: a form-fit connection, a press-fit connection.

The application further refers to the medication device according to the preceding embodiment, wherein the first part and the second part are connectable via at least one linear sliding mechanism,, wherein the first part comprises at lease one linear sliding receptacle and the second part comprises at least one linear sliding guide rail or vice versa, wherein the linear sliding receptacle and the linear sliding guide rails in conjunction form a linear sliding connector configured for establishing a releasable mechanical connection between the first part and the second part.

The application further refers to the medication device according to the preceding embodiment, wherein the linear sliding guide rails and the linear sliding receptacle are shaped complementary to each other.

The application further refers to the medication device according to any one of the preceding embodiments referring to a medication device, wherein the second part is flush with the first part.

The application refers, in a further embodiment, to a method for transcutaneously inserting a cannula into a body tissue, wherein the method comprises:.

The application further refers to the method according to the preceding embodiment, wherein step b) is performed before conducting step c).

The application further refers to the method according to any one of the two preceding embodiments, wherein step b) is performed after conducting step c).

<FIG> show an exemplarily medication device <NUM> for delivering at least one therapeutical medical fluid to a user. In <FIG> the medication device <NUM> is depicted in a disassembled state. Thereby, a perspective view is shown in <FIG> whereas in <FIG> a sectional view is shown. In <FIG>, the medication device <NUM> in an assembled state is depicted. Thereby, the medication device <NUM> is shown in a sectional view.

The medication device <NUM> comprises at least one first part <NUM> and at least one second part <NUM>. The first part <NUM> comprises at least one medical device <NUM> which will further be described below in more detail. The second part <NUM>, as specifically depicted in <FIG>, comprises at least one medication pump <NUM>. Further, the second part <NUM> comprises at least one electronics unit <NUM> and may comprise one or more energy storage devices (not shown), such as a battery.

The second part <NUM> may have a housing <NUM> configured for receiving the first part <NUM> at least partially. Thus, the housing <NUM>, such as depicted in <FIG> may have a free volume <NUM>. The free volume <NUM> may be configured for receiving the first part <NUM> such that the first part <NUM> is in direct contact with walls <NUM> of the second part <NUM>.

The first part <NUM> and the second part <NUM> may be configured to establish at least one mechanical connection such as a form-fit connection. Specifically, the first part <NUM> and the second part <NUM> may be connectable via at least one linear sliding mechanism <NUM>. The first part <NUM> may comprise at lease one linear sliding receptacle <NUM> and the second part <NUM> may comprise at least one linear sliding guide rail <NUM>, such as depicted in <FIG>. The linear sliding receptacle <NUM> and the linear sliding guide rail <NUM> may be configured for establishing a releasable mechanical connection between the first part <NUM> and the second part <NUM>. The linear sliding guide rail <NUM> may be formed as a protrusion <NUM> of the second part <NUM>. The linear sliding guide rail <NUM> and the linear sliding receptacle <NUM> may be shaped complementary to each other. Exemplarily, the linear sliding receptacle <NUM> and the linear guide rail <NUM> may have an elongate shape and may extend along a longitudinal axis <NUM> of the first part <NUM> and/or of the second part <NUM>.

<FIG> shows an exemplary embodiment of a medical device <NUM> according to the present invention in a perspective view. The medical device <NUM> may be a component of the first part <NUM> as depicted in <FIG>. Thus, reference may be made to the description above.

The medical device <NUM> comprises at least one patch <NUM> configured to be mounted onto a skin of a user. The patch <NUM> comprises at least one patch base <NUM>. Therefore, the patch <NUM>, specifically the patch base <NUM>, may comprise at least one adhesive surface <NUM>. Exemplarily, the patch base <NUM> have a plaster <NUM> and the adhesive surface <NUM> may be part of the plaster <NUM>. The patch <NUM> further comprises at least one integrated insertion mechanism <NUM> for driving a cannula <NUM> from a storage position within the patch <NUM> into an inserted position within the body tissue. The integrated insertion mechanism <NUM> is a spring driven insertion mechanism <NUM>. The second part <NUM> as described above may be an external element <NUM> which is connectable to the medical device <NUM>. The integrated insertion mechanism <NUM> may be configured to be driven by a force established when connecting the external element <NUM> to the medical device <NUM>.

The patch <NUM> further comprises at least one reservoir <NUM> configured for storing at least one therapeutical medical fluid. Specifically, the reservoir <NUM> may be fillable with insulin. The reservoir <NUM> may comprise at least one cylindrical vial <NUM>. The cylindrical vial <NUM> may specifically be rigid. The medical device <NUM> may further comprise at least one further reservoir <NUM>. The further reservoir <NUM> and the reservoir <NUM> may be arranged next to each other. Thus, the reservoir <NUM> and the further reservoir <NUM> may be arranged in a space saving manner. The reservoir <NUM> and the further reservoir <NUM> may respectively be configured for storing the same therapeutical medical fluid. Thus, a supply of the therapeutical medical fluid may be increased and a number of exchanges of the reservoirs <NUM>, <NUM> and thus of the medical device <NUM> may be reduced. However, alternatively, the further reservoir <NUM> may be configured for storing at least one further therapeutical medical fluid. Thereby, the medical device <NUM> may further comprise at least one mixing device <NUM>. The mixing device <NUM> may comprise at least one static mixer <NUM> and may be configured for mixing the therapeutical medical fluid of the reservoir <NUM> and the further therapeutical medical fluid of the further reservoir <NUM> such that a mixture is formed before the fluids are applied. The reservoir <NUM> and the further reservoir <NUM> may respectively be fluidically connected to the mixing device <NUM> via tubes <NUM>. The medical device <NUM> may further comprise at least one piston <NUM>, specifically at least one piston rod <NUM>. The piston <NUM> may be configured to displace the therapeutical medical fluid of the reservoirs <NUM>, <NUM>. The medical device <NUM> may further comprise at least one drive spindle <NUM>. The drive spindle <NUM> may be operably connectable to the medication pump <NUM> as depicted in <FIG>.

The integrated insertion mechanism <NUM> may further comprise at least one spring element <NUM>. Specifically, the spring element <NUM> may be configured to be tensioned before insertion of the cannula <NUM> into the body tissue. The reservoir <NUM> may be at least partially received within an interior space <NUM> of the spring element <NUM>. Thus, the reservoir <NUM> and the spring element <NUM> may be arranged in a space saving manner.

The integrated insertion mechanism <NUM> further comprises at least one drive unit <NUM> configured for urging the cannula <NUM> in a direction of insertion, preferably by pushing the cannula <NUM>. A functionality of the drive unit <NUM> may further be described below in more detail.

Moreover, the medical device <NUM> may further comprise at least one elongate element <NUM>.

The elongate element <NUM> may extend in a direction transverse, particularly perpendicular to a direction of extension of the spring element <NUM>, as illustrated with arrow <NUM>. The patch base <NUM> may comprise a sliding guide receptacle <NUM>, preferably a linear sliding guide rail <NUM>. The linear sliding guide rail <NUM> may extend parallel to a direction of extension of the cannula. The linear sliding guide rail <NUM> may be configured for receiving and guiding a protrusion <NUM> of the elongate element <NUM> at least partially. The protrusion <NUM> may be configured to slide within the linear sliding guide rail <NUM>. The protrusion <NUM> may have a receptacle (not shown) for fixedly receiving one end of the cannula <NUM>. Further, the reservoir <NUM> and the further reservoir <NUM> may be connectable to the cannula <NUM> via at least one fluid channel <NUM>. In this embodiment, one end of the fluid channel <NUM> may be received in the protrusion <NUM> of the elongate element <NUM>. The other end of the fluid channel <NUM> may be fluidically connected to the mixing device <NUM>. Thus, the protrusion <NUM> may be configured to establish a fluid connection between the fluid channel <NUM>, e.g. the reservoir <NUM> and the further reservoir <NUM>, and the cannula <NUM>. A functionality of the elongate element <NUM> may further be described below in more detail.

The integrated insertion mechanism <NUM> may further comprise at least one release button <NUM>. The release button <NUM> may be an elongate element with a first end <NUM> and a second end <NUM>. The first end <NUM> may have a receptacle <NUM>. The receptacle <NUM> may have a shape which corresponds to a shape of the elongate element <NUM>. Exemplarily, the elongate element <NUM> may be a cylinder having a round cross-section and the receptacle <NUM> may have a round shape correspondingly. The second end <NUM> of the release button <NUM> may be located outside of the patch <NUM>. Thus, the second end <NUM> may be accessible for the user or the patient. A functionality of the release button <NUM> may further be described below in more detail.

<FIG> show exemplarily embodiments of the medication device <NUM> in different assembling states in various cross-sectional views (<FIG>, <FIG> and <FIG>) and in various detailed views (<FIG>, <FIG>, <FIG>, <FIG>). The medication device <NUM> may correspond at least partially to the medical device <NUM> according to <FIG>. The medical device <NUM> of the medication device <NUM> may correspond at least partially to the medical device <NUM> according to <FIG>. Thus, reference may be made to the description of <FIG> above.

In <FIG>, a detailed view of the integrated insertion mechanism <NUM> is shown, before the first part <NUM> and the second part <NUM> are assembled. The medical device <NUM> may comprise the elongate element <NUM>. The elongate element <NUM> is held in position by the release button <NUM> having the first end <NUM> and the second end <NUM> (not shown in <FIG>). The first end <NUM> may comprise the receptacle <NUM>. Thus, the elongate element <NUM> may have a cylindrical shape and the receptacle <NUM> may have a corresponding round cross-section.

The integrated insertion mechanism <NUM> further comprises at least one interlocking element <NUM> configured for securing the drive unit <NUM> in a fixed position. The interlocking element <NUM> is fixedly connected to the drive unit <NUM>. The interlocking element <NUM> may comprise at least one first interlocking element component <NUM> and at least one second interlocking element component <NUM>. The first interlocking element component <NUM> and the second interlocking element component <NUM> may be at least partially made of an elastic material. The first interlocking element component <NUM> and the second interlocking element component <NUM> may be configured to form a mechanical connection, specifically a form-fit connection as will further be described below in more detail. The interlocking element has a snap closure <NUM> with a clip mechanism. The clicking mechanism may be a one-way clip mechanism.

In <FIG>, a cross-sectional view of the medication device <NUM> is shown. The medication device <NUM> comprises the first part <NUM> having the medical device <NUM>. In <FIG>, the first part <NUM> and the second part <NUM> are partially assembled. At this stage, the first part <NUM> may already be placed and attached to a skin site of the user or the patient such as via the adhesive surface <NUM>. Alternatively, the assembling of the first part <NUM> and the second part <NUM> may be conducted while the first part <NUM> is not yet attached to the skin site. As described above with regard to <FIG>, the first part <NUM> and the second part <NUM> may be connectable via at least one linear sliding mechanism <NUM>.

The elongate element <NUM> may comprise the protrusion <NUM>. The reservoir <NUM> may be connectable to the cannula <NUM> via the fluid channel <NUM>. One end <NUM> of the fluid channel <NUM> may be received in the protrusion <NUM> of the elongate element <NUM>. One ex vivo end <NUM> of the cannula <NUM> may be received in the protrusion <NUM> as well. Thus, the protrusion <NUM> may be configured to establish a fluid connection between the fluid channel <NUM>, e.g. the reservoir <NUM> and the further reservoir <NUM>, and the cannula <NUM>.

In <FIG>, the cannula <NUM> is depicted in a storage position <NUM>. Thus, the cannula <NUM>, specifically an in vivo end <NUM> of the cannula <NUM> may be received inside the patch <NUM>. The patch <NUM> may have a passage opening <NUM> such that the cannula <NUM> may be able to be inserted into the body tissue as will further be described below in more detail. The patch <NUM> may further comprise at least one cannula receptacle <NUM> configured for receiving at least a section of the cannula <NUM>. Moreover, the patch base <NUM> may comprise a sliding guide receptacle <NUM>, preferably a linear sliding guide rail <NUM> which may be configured for receiving and guiding the protrusion <NUM> of the elongate element <NUM>. Thus, the protrusion <NUM> may be configured to slide within the linear sliding guide rail <NUM>.

The cannula <NUM> has a lumen which is fully or partially enclosed by a wall <NUM> of the cannula <NUM>. Specifically, the cannula <NUM> may be a closed cannula with the wall <NUM>. Further, the cannula <NUM> may be an infusion cannula <NUM>. Specifically, the infusion cannula <NUM> may be at least partially made of steel, specifically stainless steel. The steel, specifically the stainless steel, may be biocompatible. Further, by applying the steel, specifically the stainless steel, a rigid infusion cannula may be provided. The cannula <NUM> may be a pre-bended cannula <NUM>. Thus, the cannula <NUM>, at least in absence of external forces, may be at least partially non-straight. Specifically, the cannula <NUM> may fully or partially be embodied as having the shape of a segment of a circle.

In the partially assembled state such as depicted in <FIG>, the interlocking element <NUM> may get in touch with the elongate element <NUM>. Thus, a connection between the first interlocking element component <NUM> and at least one second interlocking element component <NUM> may be opened. The second interlocking element component <NUM> may enclose the elongate element <NUM>. Meanwhile, the receptacle <NUM> of the release button <NUM> still secures the elongate element <NUM>. This state is also depicted in <FIG> in a detailed view.

In <FIG>, a cross-sectional view of the medication device <NUM> is shown. The medication device <NUM> comprises the first part <NUM> having the medical device <NUM>. In <FIG>, the first part <NUM> and the second part <NUM> are assembled. Thus, the housing <NUM> may be flush with the patch <NUM>. The receptacle <NUM> of the release button <NUM> may still secure the elongate element <NUM>. Thus, the receptacle <NUM> of the release button <NUM> may receive the elongate element <NUM>. The elongate element <NUM> may be positioned between the first interlocking element component <NUM> and at least one second interlocking element component <NUM>. Thus, the first interlocking element component <NUM> and at least one second interlocking element component <NUM> may enclose the elongate element <NUM>. The first interlocking element component <NUM> and the second interlocking element component <NUM> may be configured to form a mechanical connection <NUM>. This state is also depicted in <FIG> in a detailed view.

In <FIG>, a cross-sectional view of the medication device <NUM> is shown. The medication device <NUM> comprises the first part <NUM> having the medical device <NUM>. In <FIG>, the first part <NUM> and the second part <NUM> are assembled and the integrated insertion mechanism <NUM> is triggered. Thus, the cannula <NUM> is in an inserted position <NUM>.

The integrated insertion mechanism <NUM> may be triggerable via the release button <NUM>. Thus, by pushing the second end <NUM> in a direction transverse to the skin site (not shown) as indicated with arrow <NUM>, the first end <NUM>, e.g. the receptacle <NUM> may release the elongate element <NUM>. Thereby, the spring element <NUM> may relax in a direction of insertion such as indicated with arrow <NUM>. Consequently, the drive unit <NUM> may move in the direction of insertion. As the interlocking element <NUM> may be fixedly connected to the drive unit <NUM>, the elongate element <NUM> with the ex vivo end <NUM> of the cannula <NUM> being received in the protrusion <NUM> of the elongate element <NUM> also moves in the direction of insertion. The cannula <NUM>, specifically the in vivo end <NUM> of the cannula <NUM> may extend through the passage opening <NUM> and may be inserted into the body tissue (not shown). Thereby, the fluid channel <NUM> which may be flexible may pass from a bended configuration to a stretched configuration. Thus, a fluid connection between the reservoir <NUM> and the cannula <NUM> via the fluid channel <NUM> may be maintained. This state is also depicted in <FIG> in a detailed view.

<FIG> show an exemplary embodiment of a medical device <NUM> in different cross-sectional views. The medical device <NUM> partially corresponds to the medical device <NUM> as depicted in <FIG>. Thus, reference may be made to the description above. The medical device <NUM> comprises the patch <NUM> and the cannula <NUM>. Further, the patch <NUM> comprises the reservoir <NUM>. For further details on these components, reference may be made to the description above.

The patch <NUM> also comprises the integrated insertion mechanism <NUM>. Further, the medical device <NUM> has the drive unit <NUM>. In the medical device <NUM> according to <FIG> the drive unit <NUM> may be moveable in a direction parallel to a direction of insertion as indicated by arrow <NUM>. Thus, the spring element <NUM> may be compressible in the direction of insertion by the drive unit <NUM>. The ex vivo end <NUM> of the cannula <NUM> may be fixedly attached to an element <NUM>. The element <NUM> may be in direct contact with a support surface <NUM> of the drive unit <NUM>.

In <FIG>, the cannula <NUM> is the storage position <NUM>. Thus, the cannula <NUM>, specifically the in vivo end <NUM> of the cannula <NUM> is received in the patch <NUM>. By moving the drive unit <NUM> in the direction of insertion, the element <NUM> may slide along the sliding guide receptacle <NUM> of the path <NUM>. Thus, the cannula <NUM> may be driven from the patch <NUM> into the inserted position <NUM> within the body tissue such as depicted in <FIG>. The element <NUM> may be received by a receptacle <NUM> which is arranged in proximity to the passage opening <NUM>. Specifically, the element <NUM> may be configured to seal the receptacle <NUM>.

Claim 1:
A medical device (<NUM>) for transcutaneously inserting a cannula (<NUM>) into a body tissue, wherein the medical device (<NUM>) comprises:
• at least one cannula (<NUM>), wherein the cannula (<NUM>) comprises a lumen which is fully or partially enclosed by a wall (<NUM>) of the cannula (<NUM>);
• at least one patch (<NUM>) configured to be mounted onto a skin of a user, wherein the patch (<NUM>) comprises at least one patch base (<NUM>), wherein the patch (<NUM>) further comprises at least one integrated insertion mechanism (<NUM>) for driving the cannula (<NUM>) from a storage position (<NUM>) within the patch (<NUM>) into an inserted position (<NUM>) within the body tissue;
wherein the patch (<NUM>) further comprises at least one reservoir (<NUM>) configured for storing at least one therapeutical medical fluid and wherein the integrated insertion mechanism (<NUM>) is a spring driven insertion mechanism (<NUM>), wherein the integrated insertion mechanism (<NUM>) comprises at least one drive unit (<NUM>) configured for urging the cannula (<NUM>) in a direction of insertion, wherein the integrated insertion mechanism (<NUM>) further comprises at least one interlocking element (<NUM>) configured for securing the drive unit (<NUM>) in a fixed position, wherein the interlocking element (<NUM>) is fixedly connected to the drive unit (<NUM>), wherein the interlocking element (<NUM>) has a snap closure (<NUM>).