Patent Description:
With the development of endoscopic minimally invasive technologies, some digestive tract diseases, such as early digestive tract tumors, which require surgical laparotomy or laparoscopic treatment, can be treated by a digestive endoscopic minimally invasive surgery. In the process of endoscopic minimally invasive surgery, the suturing of digestive tract mucosal defects, including digestive tract bleeding and perforation, is the most common problem to be processed in surgery.

Currently, defect suturing instruments mainly used in endoscopic minimally invasive surgery include: endoscopic clips, nylon rope combined with metal clips (purse-string), endoscopic suturing devices (such as OTSC), suturing instruments for surgical suture (such as Overstitch), and the like. The endoscope clip is simple to use and inexpensive, but can hardly repair large defects or defects at a site difficult to operate; the nylon rope combined with metal clips for suturing can treat a large wound surface in one go, but there are risks that the wound surface cannot be completely closed and the metal clips fall into the wound surface during the suturing, which brings inconvenience to the operation; the endoscopic suturing device can provide a relatively large closing force, and can also perform full-layer suturing for a wound surface such as perforation, but the wound surface treated thereby is usually less than <NUM>, only one time of suturing can be performed by one time of endoscope entering, and the assembling operation of the instrument and the endoscope is relatively complex, and requires prior training to use; and the suturing instruments for surgical suture have their unique advantages as representative instruments for suture suturing, but the instruments are complicated in both structure and operation, and need specialized training and long-term practical operation to be mastered. For example, <CIT> discloses a chute type multi-arm clamp.

An objective of the present disclosure lies in providing a three-arm clamp, which can simply, quickly, and effectively carry out clamping and suturing of a large defect of the digestive tract and a defect at a site difficult to operate in an endoscopic minimally invasive surgery.

Embodiments of the present disclosure are realized as follows.

An embodiment of the present disclosure provides a three-arm clamp, including: three-arm clamp, including: a clamping assembly and a releasing member connected to each other, the clamping assembly includes a fixed arm and two movable arms respectively rotatably connected to the fixed arm through a hinge pin, a first sliding slot is provided at a proximal end of each movable arm, a sliding pin is slidably provided in the first sliding slot, an inner cavity is formed at a proximal end of the fixed arm, the releasing member is inserted into the inner cavity and connected to the sliding pin, an elastic sheet is further provided at the proximal end of the movable arms; when the movable arms clamp and are closed with the fixed arm, the elastic sheet is gradually folded in the inner cavity and abuts against the releasing member; in the above, a connecting end of the elastic sheet first enters the inner cavity until a free end of the elastic sheet also completely enters the inner cavity, and in the clamping and closed state of the movable arms and the fixed arm, the releasing member is separated from the sliding pin, the elastic sheet releases part of accumulated elastic potential energy, so that the free end of the elastic sheet releases part of compression amount and elastically abut against an inner wall of the inner cavity.

A clamp holder is further provided at the proximal end of the fixed arm, the inner cavity is formed between the clamp holder and the fixed arm, the releasing member is separated from the movable arms, and the free end of the elastic sheet elastically abuts against an inner wall of the clamp holder.

Optionally, the elastic sheet is perpendicular to a longitudinal direction of the movable arms, the elastic sheet has one end connected to the proximal end of the movable arm, and the other end rises upwards towards a side away from the fixed arm in the free state, and when the movable arms are rotated along the hinge pin to clamp and be closed with the fixed arm, the elastic sheet is folded in the inner cavity of the clamp holder along a radial direction of the clamp holder and abuts against the releasing member, so that the elastic sheet is folded in the inner cavity of the clamp holder or reduces the friction when being extended out, and moves smoothly.

Optionally, a locking portion extending inwards is formed on an outer edge of the clamp holder, the releasing member is separated from the movable arms, the elastic sheet releases part of the accumulated elastic potential energy to spring towards the direction of the clamp holder, until the free end of the elastic sheet abuts against the locking portion, and the locking portion limits the movement of the elastic sheet by being perpendicular to a movement direction of the elastic sheet, thus ensuring the locking of a clamping position of the elastic sheet.

Optionally, the clamp holder is of a cylindrical structure, a slot for the movable arms to pass through is formed on the clamp holder, and the locking portion is formed on a side wall of the slot, thus the locking portion can be formed with the cylindrical structure of the clamp holder, so that the three-arm clamp has a compact overall structure, and the smoothness of the whole three-arm clamp is improved, facilitating the operations in the body.

Optionally, grooves are formed at two sides of the proximal end of the fixed arm, and the clamp holder is connected with the fixed arm through the grooves. The spaces of existing structures are fully utilized, so that the three-arm clamp of the embodiments of the present disclosure has a compact structure.

Optionally, a second sliding slot is provided on the fixed arm, and the second sliding slot is a strip-shaped slot. A longitudinal direction of the second sliding slot is the same as a movement direction of the releasing member, the sliding pin is provided to extend into the second sliding slot and slides in the second sliding slot, and the second sliding slot can guide the movement of the sliding pin, moreover, while sliding in the second sliding slot, the sliding pin also slides in the first sliding slot and drives the opening and closing movement of the movable arms. The first sliding slot includes an arc-shaped section and a tail section in communication with each other. The first sliding slot and the second sliding slot form a wedge relationship during the movement, so that it is more labor-saving to pull the sliding pin through the releasing member to control the opening and closing of the movable arms.

Optionally, a sliding pin cap is provided at one end of the sliding pin located in the second sliding slot, the diameter of the sliding pin cap is matched with the width of the second sliding slot so as to slide in the second sliding slot, and the sliding pin slides in the first sliding slot. The width of the second sliding slot is greater than that of the first sliding slot. The sliding pin cap that fits and slides in the second sliding slot cannot axially penetrate through the first sliding slot due to a larger plane width thereof, thus providing structural limitation for an axial movement of the sliding pin, and improving the movement stability of the sliding pin.

Optionally, the releasing member includes a releasing lever and a releasing portion connected to a distal end of the releasing lever, a connection hole is formed in the releasing portion, a detachment portion is formed between the connection hole and the distal end of the releasing portion, the releasing member is connected to the sliding pin through the connection hole. The releasing member is located on a side of the movable arm away from the fixed arm. After the two movable arms of the clamp assembly both accurately clamp and are closed with the fixed arm, by directly pulling the releasing member continuously, the sliding pin can be detached from the connection hole through the detachment portion, thus the releasing member is separated. The process of separating the releasing member only requires withdrawing the releasing member towards the proximal direction along the movement direction of the releasing member without any lateral operation, thus saving the lateral dimension space of the three-arm clamp of the embodiments of the present disclosure, and facilitating the miniaturization and compact design of the structure.

Optionally, a sliding pin sleeve is fixedly provided on the sliding pin, and a diameter of the sliding pin sleeve is greater than an aperture of the connection hole on the releasing portion. Due to the limitation of the sliding pin sleeve, the releasing portion will not be axially displaced during the movement, and the movement stability of the releasing member can be effectively improved.

Optionally, a retainer is further coupled in the inner cavity, and the retainer includes an annular portion and at least two claws extending outwards from the annular portion, the claws are elastically coupled with the inner wall of the inner cavity, the proximal end of the releasing member is inserted into the annular portion, and the separation of the releasing members from the movable arms can drive the retainer to be separated and retracted. In an operating process of controlling the movable arms and the fixed arm of the clamping assembly to be opened and closed with each other through the releasing member so as to clamp a target object, two releasing levers of the movable arms at two side are respectively controlled to have a telescopic movement in the annular portion, and the annular portion can restrict a movement direction of the releasing member, so that the releasing member has better straightness during the movement, and after the clamping of the target object is completed, the releasing member separated from the movable arms are retracted towards the proximal direction. Generally, the width of the releasing member is set to be greater than the inner diameter of the annular portion, then in the process of retracting the releasing member, the claws of the retainer can be driven to separate from the elastic coupling with the clamp holder, and retracted together with the releasing member.

Optionally, the three-arm clamp of the embodiments of the present disclosure further includes a handle assembly, the handle assembly includes a handle bracket and two handle sliders provided at two sides of the handle bracket and respectively slidable on the handle bracket, the proximal end of the releasing member is connected to an operating wire, and the two handle sliders are correspondingly connected to proximal ends of the operating wires at the same side, respectively. When the three-arm clamp of the embodiments of the present disclosure is applied to endoscopic surgery, the handle assembly is operated outside the body, connected to an operation part entering the body through the operating wire and controls the operation, and after the clamping operation in the body is completed, a part at the distal end other than clamping assembly is withdrawn from the body through the control of the handle assembly.

Optionally, the proximal end of the fixed arm is connected to one end of a spring tube, the other end of the spring tube is connected to the handle bracket, and the operating wires are provided in the spring tube. The spring tube itself has a certain flexible telescopic and bending capability, and by guiding the introduction or extraction of the operating wires into or out of the body through the spring tube, the operation difficulty can be reduced, and the spring tube can protect the operating wires.

The embodiments of the present disclosure include the following beneficial effects.

The embodiments of the present disclosure provide a three-arm clamp, including: a clamping assembly and a releasing member connected to each other, the clamping assembly includes a fixed arm and two movable arms respectively rotatably connected to the fixed arm through a hinge pin, a first sliding slot is provided at a proximal end of each movable arm, a sliding pin is slidably provided in the first sliding slot, an inner cavity is provided at a proximal end of the fixed arm, the releasing member is inserted into the inner cavity and connected to the sliding pin, and the releasing member continues to be pushed towards a distal end along a direction in which the releasing member is inserted, each movable arm is driven to rotate with the hinge pin as a center through the movement of the sliding pin along with the releasing member towards the distal end and the sliding of the sliding pin in the first sliding slot, and the distal end of the movable arm is opened relative to the fixed arm. After a target object is confirmed, the releasing member is pulled towards the proximal direction, and the sliding pin moves towards the proximal direction along with the releasing member and slides in the first sliding slot, to drive the movable arms to rotate, and the distal ends of the movable arms are closed towards the fixed arm so as to clamp the target object. An elastic sheet is further provided at the proximal ends of the movable arms, and when the movable arms are rotated along the hinge pin to clamp and be closed with the fixed arm, the elastic sheet is gradually folded in the inner cavity and abuts against the releasing member; in the above, as the distal ends of the movable arms approach the fixed arm, a connecting end of the elastic sheet first enters the inner cavity until the distal ends of the movable arms clamp and are closed with the fixed arm, the free end of the elastic sheet also completely enters the inner cavity, and the free end of the elastic sheet abuts against a surface of the releasing member. After the movable arms at two sides are respectively controlled to clamp the target object, the releasing member is separated from the sliding pin, the releasing member can be folded through the proximal end, the free end of the elastic sheet is separated from the abutment against the surface of the releasing member, and after releasing part of accumulated elastic potential energy, elastically abuts against the inner wall of the inner cavity. The elastic abutment of the elastic sheet against the inner wall of the inner cavity effectively ensures stability of clamping and fixing between the fixed arm and the movable arms in the part of the clamping assembly left in the body after the operation is completed.

In order to more clearly illustrate the technical solutions of embodiments of the present disclosure, accompanying drawings which need to be used in the embodiments will be introduced below briefly, and it should be understood that the accompanying drawings below merely show some embodiments of the present disclosure, and therefore should not be considered as limitation to the scope, and a person ordinarily skilled in the art still could obtain other relevant accompanying drawings according to these accompanying drawings, without any inventive effort.

Reference signs: <NUM>-clamping assembly; <NUM>-hinge pin; <NUM>-fixed arm; <NUM>-groove; <NUM>-second sliding slot; <NUM>-movable arm; <NUM>-first sliding slot; <NUM>-elastic sheet; <NUM>-clamp holder; <NUM>-slot; <NUM>-locking portion; <NUM>-releasing member; <NUM>-releasing lever; <NUM>-releasing portion; <NUM>-connection hole; <NUM>-detachment portion; <NUM>- sliding pin; <NUM>- sliding pin cap; <NUM>- sliding pin sleeve; <NUM>-retainer; <NUM>-annular portion; <NUM>-claw; <NUM>-handle assembly; <NUM>-handle bracket; <NUM>-handle slider; <NUM>-spring tube; <NUM>-operating wire; A, B, C-arrow coordinate direction; T-partially enlarged region.

In order to make objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present disclosure, and apparently, some but not all embodiments of the present disclosure are described. Generally, components in the embodiments of the present disclosure described and shown in the accompanying drawings herein may be arranged and designed in different configurations.

It should be noted that similar reference signs and letters represent similar items in the following accompanying drawings, therefore, once a certain item is defined in one accompanying drawing, it is not needed to be further defined or explained in subsequent accompanying drawings.

In the description of the present disclosure, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product is usually placed in use. It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the mentioned device or element must be in a specific orientation, or constructed or operated in a specific orientation, and therefore it cannot be understood as a limitation to the present disclosure. Besides, terms such as "first", "second", and "third" are merely for distinctive description, but should not be construed as indicating or implying importance in the relativity.

In the description of the present disclosure, it should be further illustrated that, unless otherwise specifically regulated and defined, the terms "set", "join", and "connect" should be understood in a broad sense, for example, a connection may be a fixed connection, a detachable connection, or an integrated connection; it may be a mechanical connection or an electrical connection; it may be direct joining or indirect joining through an intermediary, and it also may be inner communication between two elements. For those ordinarily skilled in the art, the specific meanings of the above-mentioned terms in the present disclosure can be understood in specific situations.

Those skilled in the art could understand that a three-arm clamp of an embodiment of the present disclosure can be used in endoscopic surgery, and when applied in endoscopic surgery, the three-arm clamp includes a distal part which is extended into a human body to perform operations such as clamping, and a proximal part which is operated by a doctor outside the body. Therefore, in contrast, in the embodiments of the present disclosure, for the three-arm clamp as a whole and each part thereof, a side close to the operations in the body is called as a distal end, and a side close to the doctors' operations is called as a proximal end.

<FIG> is a first structural schematic view of the three-arm clamp provided in an embodiment of the present disclosure. Referring to <FIG>, an embodiment of the present disclosure provides a three-arm clamp, including: a clamping assembly <NUM> and a releasing member <NUM> connected to each other, the clamping assembly <NUM> includes a fixed arm <NUM> and two movable arms <NUM> respectively rotatably connected to the fixed arm <NUM> through a hinge pin <NUM>, a first sliding slot <NUM> is provided at a proximal end of each movable arm <NUM>, and a sliding pin <NUM> is slidably provided in the first sliding slot <NUM>, an inner cavity is further provided at the proximal end of the fixed arm <NUM>, the releasing member <NUM> is inserted into the inner cavity and connected to the sliding pin <NUM>, a distal end of each movable arm <NUM> can be opened and closed with the fixed arm <NUM> under the control of extension and retraction of the releasing member <NUM>, and an elastic sheet <NUM> is further provided at the proximal end of the movable arms <NUM>; when the movable arms <NUM> are rotated along the hinge pin <NUM> to clamp and be closed with the fixed arm <NUM>, the elastic sheet <NUM> is gradually folded in the inner cavity and abuts against the releasing member <NUM>; in the above, a connecting end of the elastic sheet <NUM> first enters the inner cavity until a free end of the elastic sheet <NUM> also completely enters the inner cavity, and in the clamping and closed state of the movable arms <NUM> and the fixed arm <NUM>, the releasing member <NUM> is separated from the sliding pin <NUM>, the elastic sheet <NUM> releases part of accumulated elastic potential energy, so that the free end of the elastic sheet <NUM> releases part of compression amount and elastically abuts against an inner wall of the inner cavity.

The three-arm clamp of the embodiments of the present disclosure is usually applied to a surgical operation through an endoscope, for a clamping operation of a part to be sutured in a body, especially a clamping operation for suturing a large-area wound or distant positions.

In the three-arm clamp of the embodiments of the present disclosure, the clamping assembly <NUM> and the releasing member <NUM> connected to each other as shown in <FIG> are both extended into the patient. <FIG> shows a view that the fixed arm <NUM> and the movable arms <NUM> in the clamping assembly <NUM> are in an opened state, at this time, the whole clamping assembly <NUM> can be controlled to move, so that tissue structures of a site to be clamped or a wound edge are located between the opened fixed arm <NUM> and movable arms <NUM>. When the tissue structures at the wound edge are confirmed to be located between the opened fixed arm <NUM> and movable arms <NUM>, the releasing member <NUM> is pulled linearly towards the proximal direction. The releasing member <NUM> is connected to the sliding pin <NUM>. As the releasing member <NUM> retreats, the sliding pin <NUM> is driven to retreat, and while the sliding pin <NUM> slides in the first sliding slot <NUM>, due to the movement of position of the sliding pin <NUM>, the movable arms <NUM> are also driven to rotate, and both the proximal end and the distal end of each movable arm <NUM> approach the proximal end and the distal end of the fixed arm <NUM> respectively. When the sliding pin <NUM> slides to a position close to a terminal end of the proximal end of the first sliding slot <NUM>, the movable arms <NUM> are rotated to clamp and be closed with the fixed arm <NUM>, at this time, the tissue structures at the wound edge have been clamped and fixed between the movable arms <NUM> and the fixed arm <NUM>. <FIG> is a second structural schematic view of the three-arm clamp provided in the present disclosure, and as shown in <FIG>, it is a closed state. At this time, the position of the whole clamping assembly <NUM> may be moved again, if needed, to a position that needs to be sutured to the tissue structures at the wound edge, the movable arm <NUM> at the other side is opened in the same way to clamp and then close the position, in this way, the structures that need to be sutured to each other are clamped and fixed together by the three-arm clamp of the embodiments of the present disclosure from two separated places, at this time, suturing through a suturing device under an endoscope can reduce the difficulty of operation, and effectively improve the suturing effect.

In the above, as shown in <FIG>, when the movable arms <NUM> and the fixed arm <NUM> are in the opened state, the elastic sheet <NUM> connected to and provided at the proximal end of each movable arm <NUM> is also in a free state away from a clamp holder <NUM>. <FIG> is a structural schematic view of the movable arm <NUM> in the three-arm clamp of an embodiment of the present disclosure. It can be seen from <FIG> that when the elastic sheet <NUM> is in the free state, the free end of the elastic sheet <NUM> rises upwards and is higher than a rotation plane of the movable arm <NUM>. Referring to the opened and closed state views of <FIG> and <FIG> in combination again, as shown in <FIG>, the inner cavity covers at least the proximal end position of the fixed arm <NUM>, when the releasing member <NUM> is controlled to move towards the proximal direction, the movable arm <NUM> at one side correspondingly controlled by the releasing member <NUM> is rotated therewith, and changes from the opened state in <FIG> to the closed state in <FIG>, the elastic sheet <NUM> is gradually folded into the clamp holder <NUM> from the connecting end thereof connected to the movable arm <NUM> to the free end, as shown in <FIG>. As the releasing member <NUM> is inserted into the inner cavity and connected to the sliding pin, the releasing member <NUM> is located outside the movable arm <NUM>, and when the movable arm <NUM> is gradually folded into the inner cavity, the free end of the elastic sheet <NUM> is gradually deformed and compressed and then abuts against a surface of the releasing member <NUM>.

Without doubt, in the above surgical operation, considering that the clamping of the tissue structures at the wound edge probably will not be completed at one time, re-clamping may be involved after one time of inaccurate clamping, or after clamping and suturing at one site, the clamped site needs to be released, to clamp and suture another site again, the above opening and closing of the movable arms <NUM> and the fixed arm <NUM> can be repeated a plurality of times under the control of the releasing member <NUM>. Moreover, the magnitude of an opening angle of the movable arms <NUM> relative to the fixed arm <NUM> can be adjusted adaptively according to needs, for example, being adjusted by setting the shape and length of the first sliding slot <NUM>, or possibly being finely adjusted by adjusting setting positions of the hinge pin <NUM> on the movable arms <NUM> and the fixed arm <NUM>. When the fixed arm <NUM> and the movable arms <NUM> in a clamping state need to be expanded, it is only required to push the releasing member <NUM> to move linearly towards the distal end, the elastic sheet <NUM> on the movable arms <NUM> merely abuts against a plane of the releasing member <NUM> through the free end, and the abutment state does not affect the operation of pushing the movable arms <NUM> to rotate and open.

After the clamping operation of the three-arm clamp of the embodiments of the present disclosure in the patient is completely accomplished, the clamping state of the clamping assembly <NUM> further needs to be locked, and the releasing member <NUM> and the clamping assembly <NUM> needs to be disconnected, so that the releasing member <NUM> is withdrawn through a surgical portal, and the clamping assembly <NUM> remains in the body to meet the clamping requirement. According to the three-arm clamp of the embodiments of the present disclosure, after the releasing member <NUM> and the sliding pin <NUM> are disconnected, and the releasing member <NUM> is withdrawn from the inner cavity, the free end of the elastic sheet <NUM> originally abutting against the releasing member <NUM> loses an abutting force, then releases part of the accumulated elastic potential energy. The free end of the elastic sheet <NUM> releases part of the compressed amount and rises upwards, and elastically abuts against the inner wall of the inner cavity. In this way, due to the restriction of an inner wall edge of the inner cavity, a position of the elastic sheet <NUM> is abutted and limited, thus ensuring the clamping stability of the clamping assembly <NUM> after the releasing member <NUM> is withdrawn.

It should be noted that, first, in the three-arm clamp of the embodiments of the present disclosure, the fixed arm <NUM> and the movable arms <NUM> are rotatably connected through the hinge pin <NUM>, wherein the hinge pin <NUM> refers to a generalized rotating shaft, as long as the fixed arm <NUM> and the movable arms <NUM> provided thereon can be rotated relative to each other with the hinge pin <NUM> as a center, and a specific structural form of the hinge pin <NUM> is not limited and required in the embodiments of the present disclosure. By the same reasoning, in the three-arm clamp of the embodiments of the present disclosure, a specific shape structure of the sliding pin <NUM> slidably provided in the first sliding slot <NUM> is not defined, either, the sliding pin <NUM> is slidably provided in the first sliding slot <NUM>, and is connected to the distal end of the releasing member <NUM>. As the hinge pin <NUM> has a certain distance from the first sliding slot <NUM>, pulling the releasing member <NUM> to make the sliding pin <NUM> move in the first sliding slot <NUM> is equivalent to pulling each movable arm <NUM> from the proximal end of the movable arm <NUM>, so that the movable arm <NUM> is rotated relative to the fixed arm <NUM> along the hinge pin <NUM>, and the distal end of the movable arm <NUM> and the distal end of the fixed arm <NUM> are opened and closed under rotation. In this process, as it is difficult to avoid change of angle between the releasing member <NUM> and the movable arm <NUM>, when the change of angle occurs between the two, corresponding rotation angle of the sliding pin <NUM> in the first sliding slot <NUM> is sufficient. Therefore, as long as the sliding pin <NUM> meets the conditions required by the above motion operation, the embodiments of the present disclosure do not specifically limit other structural features of the sliding pin <NUM>.

Second, the inner cavity is provided at the proximal end of the fixed arm <NUM>, the movable arms <NUM> and the fixed arm <NUM> clamp and are closed, the proximal end of each movable arm <NUM> is folded in the inner cavity, and the elastic sheet <NUM> provided at the proximal ends of the movable arms <NUM> abuts against the releasing member <NUM>. After the clamping operation is completed at the distal end, the releasing member <NUM> is separated from the sliding pin <NUM>, the releasing member <NUM> is withdrawn from the proximal end, at this time, the elastic sheet <NUM> can release part of the accumulated elastic potential energy in the space where the releasing member <NUM> is withdrawn, and elastically abuts against the inner wall of the inner cavity. In the above, in the embodiments of the present disclosure, the manner of providing the inner cavity is not specifically limited, for example, it may be as shown in <FIG>, in which the inner cavity is located between the fixed arm <NUM> and the clamp holder <NUM> provided at the proximal end of the fixed arm <NUM>, wherein the clamp holder <NUM> may be fixedly connected to the proximal end of the fixed arm <NUM>, or may be integrally formed with the fixed arm <NUM>, or the fixed arm <NUM> itself may include an inner cavity at the proximal end formed by an extended structure.

An embodiment of the present disclosure provides a three-arm clamp, including a clamping assembly <NUM> and a releasing member <NUM> connected to each other, the clamping assembly <NUM> includes a fixed arm <NUM> and two movable arms <NUM> respectively rotatably connected to the fixed arm <NUM> through a hinge pin <NUM>, a first sliding slot <NUM> is provided at the proximal end of each movable arm <NUM>, and a sliding pin <NUM> is slidably provided in the first sliding slot <NUM>, an inner cavity is formed at a proximal end of the fixed arm <NUM>, the releasing member <NUM> is inserted into the inner cavity and connected to the sliding pin <NUM>, and the releasing member <NUM> continues to be pushed towards a distal end along a direction in which the releasing member <NUM> is inserted, each movable arm <NUM> is driven to rotate with the hinge pin <NUM> as a center through the movement of the sliding pin <NUM> along with the releasing member <NUM> towards the distal end and the sliding of the sliding pin <NUM> in the first sliding slot <NUM>, and the distal end of the movable arm <NUM> is opened relative to the fixed arm <NUM>. After a target object is confirmed, the releasing member <NUM> is pulled towards the proximal direction, and the sliding pin <NUM> moves towards the proximal direction along with the releasing member <NUM> and slides in the first sliding slot <NUM>, to drive the movable arms <NUM> to rotate, and the distal ends of the movable arms <NUM> are closed towards the fixed arm <NUM> so as to clamp the target object. An elastic sheet <NUM> is further provided at the proximal ends of the movable arms <NUM>, and when the movable arms <NUM> are rotated along the hinge pin <NUM> to clamp and be closed with the fixed arm <NUM>, the elastic sheet <NUM> is gradually folded in the inner cavity and abuts against the releasing member <NUM>; in the above, as the distal ends of the movable arms <NUM> approach the fixed arm <NUM>, a connecting end of the elastic sheet <NUM> first enters the inner cavity until the distal ends of the movable arms <NUM> clamp and are closed with the fixed arm <NUM>, the free end of the elastic sheet <NUM> also completely enters the inner cavity, and the free end of the elastic sheet <NUM> abuts against a surface of the releasing member <NUM>. After the movable arms <NUM> at two sides are respectively controlled to clamp the target object, the releasing member <NUM> is separated from the sliding pin <NUM>, the releasing member <NUM> can be folded through the proximal end, the free end of the elastic sheet <NUM> is separated from the abutment against the surface of the releasing member <NUM>, and after releasing part of accumulated elastic potential energy, elastically abuts against the inner wall of the inner cavity. The elastic abutment of the elastic sheet <NUM> against the inner wall of the inner cavity effectively ensures stability of clamping and fixing between the fixed arm <NUM> and the movable arms <NUM> in the part of the clamping assembly <NUM> left in the body after the operation is completed.

As seen in <FIG> and <FIG>, a clamp holder <NUM> is provided at the proximal end of the fixed arm <NUM>, the inner cavity is formed between the clamp holder <NUM> and the fixed arm <NUM>, the releasing member <NUM> is separated from the movable arms <NUM>, and the free end of the elastic sheet <NUM> elastically abuts against the inner wall of the clamp holder <NUM>.

As shown in <FIG>, the clamp holder <NUM> is provided at the proximal end of the fixed arm <NUM>, wherein the clamp holder <NUM> may be integrally molded and connected to the fixed arm <NUM>, alternatively, the clamp holder <NUM> also may be fixedly connected to the fixed arm <NUM> in other manners, and the inner cavity is formed between the clamp holder <NUM> and the fixed arm <NUM>, in this way, the size of the inner cavity can be correspondingly adjusted according to the dimension of the clamp holder <NUM>, and has the designability in a certain range , furthermore, as the inner cavity is formed between the clamp holder <NUM> and the fixed arm <NUM>, the inner wall of the clamp holder <NUM> can serve as the inner wall of the inner cavity, is configured to elastically abut against the free end of the elastic sheet <NUM>, and fully utilizes the existing structure features, so that the three-arm clamp of the embodiments of the present disclosure has a compact structure, and has a high space utilization rate.

In the following description, a specific structure and operation mode will be described with reference to the accompanying drawings, in which the clamp holder <NUM> is provided at the proximal end of the fixed arm <NUM>, and the inner cavity is formed between the fixed arm <NUM> and the clamp holder <NUM>.

Alternatively, referring to <FIG> and <FIG> in combination, the elastic sheet <NUM> is perpendicular to a longitudinal direction of the movable arms <NUM>, the elastic sheet <NUM> has one end connected to the proximal end of the movable arm <NUM>, and the other end rises upwards towards a side away from the fixed arm <NUM> in the free state, and when the movable arms <NUM> are rotated along the hinge pin <NUM> to clamp and be closed with the fixed arm <NUM>, the elastic sheet <NUM> is folded in the inner cavity of the clamp holder <NUM> along a radial direction of the clamp holder <NUM> and abuts against the releasing member <NUM>.

As shown in <FIG>, an extending direction of the elastic sheet <NUM> is approximately perpendicular to a longitudinal direction when the movable arms <NUM> are in the closed state, therefore, then when the movable arms <NUM> are closed to make the elastic sheet <NUM> to be gradually folded in the inner cavity, the process in which the elastic sheet <NUM> abuts against the releasing member <NUM> gradually abuts and slides in a direction indicated by an arrow in <FIG>, in this way, on the one hand, in the whole process that the elastic sheet <NUM> abuts against the releasing member <NUM>, the elastic sheet <NUM> is always in contact with the releasing member <NUM> with the smallest width, so that a friction force between the two is as small as possible, thus the operation is labor-saving and smooth; on the other hand, it also effectively avoids the problem that when the elastic sheet <NUM> enters and exits in a manner of having friction with the releasing member <NUM> at a certain angle, direct contact between an edge of the elastic sheet <NUM> and an edge of the releasing member <NUM> possibly causes serious abrasion or jamming there between.

<FIG> is a sectional view of <FIG> from another perspective. Optionally, as shown in <FIG>, a locking portion <NUM> extending inwards is formed on an outer edge of the clamp holder <NUM>, and an extending direction of the locking portion <NUM> is a direction shown by an arrow B of a coordinate axis in <FIG>, the releasing member <NUM> is separated from the movable arms <NUM> (the releasing member <NUM> is withdrawn in a direction opposite to an arrow C in <FIG>), the elastic sheet <NUM> releases part of the accumulated elastic potential energy to spring towards the direction of the clamp holder <NUM> (i.e., a direction opposite to arrow B in <FIG>), until the free end of the elastic sheet <NUM> abuts against the locking portion <NUM>, the movable arms <NUM> need to be rotated to open, and the free end of the elastic sheet <NUM> needs to move in a direction of an arrow A in <FIG>, the free end of the elastic sheet <NUM> elastically abuts against the locking portion <NUM>, and the locking portion <NUM> limits the movement of the elastic sheet <NUM> by being perpendicular to a movement direction of the elastic sheet <NUM>, thus ensuring the locking of a clamping position of the elastic sheet <NUM>.

Optionally, as shown in <FIG>, the clamp holder <NUM> is of a cylindrical structure, a slot <NUM> for the movable arms <NUM> to pass through is formed on the clamp holder <NUM>, and the locking portion <NUM> is formed on a side wall of the slot <NUM>.

The clamp holder <NUM> of a cylindrical structure has a smooth and rounded outer circumference, so that the three-arm clamp of the embodiments of the present disclosure, in the process of being extended into a wounded part in the body and moved to operate, avoids scratches that may be caused by edges and corners to human tissues, and the clamp holder <NUM> of a cylindrical structure also can protect the fixed arm <NUM> and the movable arms <NUM> located in the inner cavity thereof. When the clamp holder <NUM> is of a cylindrical structure, in order to ensure that the movable arms <NUM> can smoothly enter and exit the inner cavity of the clamp holder <NUM> while rotating, the slot <NUM> needs to be preset at a position of the clamp holder <NUM> where the movable arms <NUM> enter and exit, so as to avoid an interference on the movement of the movable arms <NUM>, and in this case, the locking portion <NUM> can be formed at a position of a side wall of the slot <NUM> on the clamp holder <NUM>, or in other words, the side wall of the slot <NUM> on the cylindrical clamp holder <NUM> is directly used as the holding portion, so that no additional locking portion <NUM> needs to be provided on the clamp holder <NUM>.

Without doubt, it should be noted that the length of the clamp holder <NUM>, the position, size, dimension and etc. of the slot <NUM> formed on the clamp holder <NUM> are not specifically limited in the embodiments of the present disclosure, and may be correspondingly set and selected according to the structure and movement requirements of the movable arms <NUM> in the three-arm clamp.

<FIG> are structural schematic views of the fixed arm <NUM> of the three-arm clamp in an embodiment of the present disclosure. Optionally, as shown in <FIG> in combination with <FIG>, grooves <NUM> are formed at two sides of the proximal end of the fixed arm <NUM>, a clamp holder <NUM> is further provided at the proximal end of the fixed arm <NUM>, the inner cavity is formed between the clamp holder <NUM> and the fixed arm <NUM>, and the clamp holder <NUM> is connected with the fixed arm <NUM> through the grooves <NUM>.

The clamp holder <NUM> is clamped and fixed at the proximal end of the fixed arm <NUM> by means of the grooves <NUM>, which, on the basis of ensuring the clamping stability, fully utilizes spaces of existing structures, and reduces an outer diameter of the clamp holder <NUM> without affecting the structure and smooth operation, so that the three-arm clamp of the embodiments of the present disclosure has a compact structure.

Optionally, as shown in <FIG>, a second sliding slot <NUM> is provided on the fixed arm <NUM>, and the second sliding slot <NUM> is a strip-shaped slot. <FIG> is a partial enlarged view of a region T in <FIG>. Referring to <FIG> again, a longitudinal direction (indicated by a bidirectional arrow in <FIG>) of the second sliding slot <NUM> is the same as a movement direction of the releasing member <NUM>, the sliding pin <NUM> is provided to extend into the second sliding slot <NUM> and slides in the second sliding slot <NUM>, and the second sliding slot <NUM> can guide the movement of the sliding pin <NUM>, avoiding possible lateral bouncing or motion offset when the sliding pin <NUM> is pushed and pulled to move only by the releasing member <NUM>.

It should be noted that the second sliding slot <NUM> being a strip-shaped slot means that the second sliding slot <NUM> may be a straight-strip-shaped slot as shown in <FIG>, and it also includes the case that the second sliding slot is processed into a slot similar to a straight strip due to processing errors or special operation requirements, as long as the second sliding slot <NUM> can guide the movement of the sliding pin <NUM>.

Moreover, while sliding in the second sliding slot <NUM>, the sliding pin <NUM> also slides in the first sliding slot <NUM> and drives the opening and closing movement of the movable arms <NUM>. It can be seen from <FIG> that the first sliding slot <NUM> includes an arc-shaped section and a tail section in communication with each other. As shown in <FIG>, the first sliding slot <NUM> and the second sliding slot <NUM> form a wedge relationship during the movement, so that it is more labor-saving to pull the sliding pin <NUM> through the releasing member <NUM> to control the opening and closing of the movable arms <NUM>.

The first sliding slot <NUM> includes the arc-shaped section and the tail section in communication with each other, and when the sliding pin <NUM> moves in position in the arc-shaped section of the first sliding slot <NUM>, the movable arms <NUM> are rotated relative to the hinge pin <NUM>, so that the distal ends of the movable arms <NUM> and the fixed arm <NUM> are opened and closed, when the sliding pin <NUM> moves to a terminal end of the arc-shaped section, the distal ends of the movable arms <NUM> have been closed and clamped with the fixed arm <NUM>, in this case, the tail section of the first sliding slot <NUM> overlaps with an extending direction of the second sliding slot <NUM>, the releasing member <NUM> is further pulled, so that when the sliding pin <NUM> enters the terminal end of the tail section, the releasing member <NUM> and the sliding pin <NUM> can be separated from each other, meanwhile, the clamping and closed relationship between the movable arms <NUM> and the fixed arm <NUM> is locked by limiting a position of an elastic section of the elastic sheet <NUM>.

Optionally, as shown in <FIG>, a sliding pin cap <NUM> is provided at one end of the sliding pin <NUM> located in the second sliding slot <NUM>, the diameter of the sliding pin cap <NUM> is matched with the width of the second sliding slot <NUM> so as to slide in the second sliding slot <NUM>, and the sliding pin <NUM> slides in the first sliding slot <NUM>. The width of the second sliding slot <NUM> is greater than that of the first sliding slot <NUM>.

In this way, the sliding pin cap <NUM> that fits and slides in the second sliding slot <NUM> cannot axially penetrate through the first sliding slot <NUM> due to a larger plane width thereof, thus providing structural limitation for an axial movement of the sliding pin <NUM>, and improving the movement stability of the sliding pin <NUM>.

Optionally, as shown in <FIG>, the releasing member <NUM> includes a releasing lever <NUM> and a releasing portion <NUM> connected to a distal end of the releasing lever <NUM>, a connection hole <NUM> is formed in the releasing portion <NUM>, a detachment portion <NUM> is formed between the connection hole <NUM> and the distal end of the releasing portion <NUM>, the releasing member <NUM> is connected to the sliding pin <NUM> through the connection hole <NUM>, the width of the detachment portion <NUM> is less than an axial diameter of the sliding pin <NUM>, and the releasing member <NUM> is located at one side of the movable arms <NUM> away from the fixed arm <NUM>.

Hooked structures are usually adopted in the prior art, so as to ensure that the clamping state of the clamping assembly <NUM> is locked after the releasing member <NUM> is separated. However, as the operating action of the releasing member <NUM> is a linear movement, to realize stable hooking, the hooked structures can only adopt structures perpendicular to the straight line direction, then to realize the hooked state by the action of the releasing member <NUM>, the releasing member <NUM> also must be moved laterally, which will result in an increased lateral dimension of the whole structure of the device.

As shown in <FIG>, after the two movable arms <NUM> of the clamping assembly <NUM> both accurately clamp and are closed with the fixed arm <NUM>, by directly pulling the releasing member <NUM> continuously, the sliding pin <NUM> can be detached from the connection hole <NUM> through the detachment portion <NUM>, thus the releasing member <NUM> is separated. The process of separating the releasing member <NUM> only requires withdrawing the releasing member <NUM> towards the proximal direction along the movement direction of the releasing member <NUM> without any lateral operation, thus saving the lateral dimension space of the three-arm clamp of the embodiments of the present disclosure, and facilitating the miniaturization and compact design of the body structure of the three-arm clamp.

It should be noted that, for the three-arm clamp of the embodiments of the present disclosure, the structure form of the detachment portion <NUM> is not specifically limited, as long as the releasing member <NUM> can be further pulled towards the proximal direction, so that the releasing member <NUM> can be detached from the connection hole <NUM> through the detachment portion <NUM>. Several forms of the detachment portion <NUM> will be exemplified below with reference to the <FIG>, respectively.

Exemplarily, as shown in <FIG>, the detachment portion <NUM> may be a notch structure formed on a side of the releasing member <NUM> opposite to the connection hole <NUM>, the width of the notch structure is less than the diameter of the sliding pin <NUM>, and when the releasing member <NUM> is operated normally, the releasing member <NUM> will not be detached from the sliding pin <NUM> through the notch structure, and in the process of further pulling the releasing member <NUM> to make the same to be separated from the sliding pin <NUM>, the notch structure is elastically deformed to a certain extent, so that it is more labor-saving detach the sliding pin <NUM> from the notch structure, and damage caused by rigid tearing at a distal end position of the releasing member <NUM> is avoided.

Exemplarily, as shown in <FIG>, the detachment portion <NUM> may be a split structure formed on a side of the releasing member <NUM> opposite to the connection hole <NUM>, that is, at the position where the split structure is located, a part originally forming an outer wall of the connection hole <NUM> is cut in a linear direction, in this way, when an external force is applied, two parts which are cut in the linear direction can be separated from each other, and when the releasing member <NUM> is operated normally, the split structure is subjected to a smaller external force, and the releasing member <NUM> will not be detached from the sliding pin <NUM> through the split structure. In the process of further pulling the releasing member <NUM> to make the same to be separated from the sliding pin <NUM>, the split structure is subjected to a sufficient external force to be elastically deformed to a certain extent, thus making it labor-saving for the sliding pin <NUM> to be detached from the split structure, and avoiding damage caused by rigid tearing at the distal end position of the releasing member <NUM>.

Exemplarily, as shown in <FIG>, the releasing member <NUM> also may be made of a material with small disconnection strength, or the detachment portion <NUM> of the releasing member <NUM> is provided to be thinner than other positions.

The detachment portion <NUM> may be a V-shaped notch formed on a side of the releasing member <NUM> opposite to the connection hole <NUM>, wherein opening directions of V-shaped notches shown in <FIG> are opposite. By providing the V-shaped notch, guiding structures capable of being separated from each other by force are formed between the connection hole <NUM> and the distal end of the releasing portion <NUM>, but the V-shaped notch is not disconnected from the connection hole <NUM>, in this way, when the releasing member <NUM> is operated normally, an external force applied to the V-shaped notch is relatively small, and the V-shaped notch will not adversely affect the operation strength of the releasing member <NUM>. In the process of further pulling the releasing member <NUM> to be separated from the sliding pin <NUM>, due to the smaller strength that the material of the detachment portion <NUM> can withstand, or due to the relatively small thickness provided, the position of the detachment portion <NUM> can be made to be subjected to force first, and due to the configuration of the V-shaped notch, the thickness at the position of the V-shaped notch is minimized, so as to guide a disconnection position to the V-shaped notch, and under a tensile force of appropriate strength, disconnection occurs at the thinnest position between the connection hole <NUM> and the V-shaped notch, so that it is labor-saving when making the sliding pin <NUM> to be detached from the V-shaped notch, and avoiding damage caused by rigid tearing at the distal end position of the releasing member <NUM>.

On the basis of providing the sliding pin cap <NUM> on the sliding pin <NUM> in the above, optionally, as shown in <FIG>, a sliding pin sleeve <NUM> is further fixedly provided on the sliding pin <NUM>, and a diameter of the sliding pin sleeve <NUM> is greater than an aperture of the connection hole on the releasing portion <NUM>. The releasing portion <NUM> can only move linearly along the longitudinal direction of the second sliding slot <NUM> during the movement process. Due to the guiding effect of the second sliding slot <NUM>, the releasing portion <NUM> will not swing laterally. Due to the limitation of the sliding pin sleeve <NUM> and the sliding pin cap <NUM>, the releasing portion <NUM> will not be axially displaced, therefore, the movement stability of the releasing member <NUM> can be effectively improved, thus ensuring that the operation process of the three-arm clamp of the embodiments of the present disclosure is accurately controlled.

In addition, as shown in <FIG>, the second sliding slot <NUM> is provided at the proximal end of the fixed arm <NUM>, a terminal end of the proximal end of the second sliding slot <NUM> is provided with a slot in communication with the second sliding slot <NUM>, in this way, by applying a relative force to two sides for providing the clamp holder <NUM> at the proximal end of the fixed arm <NUM>, the two sides can be elastically deformed and are relatively close to each other, thus the clamp holder <NUM> can be elastically fitted and sleeved in the groove directly from the proximal end of the fixed arm <NUM>, so that the assembly of the clamp holder <NUM> is convenient and quick.

Optionally, as shown in <FIG>, a retainer <NUM> is further clamped in the clamp holder <NUM>, and the retainer <NUM> includes an annular portion <NUM> and at least two claws <NUM> extending outwards from the annular portion <NUM>, the claws <NUM> are elastically coupled with the clamp holder <NUM>, the proximal end of the releasing member <NUM> is inserted into the annular portion <NUM>, and in an operating process of controlling the movable arms <NUM> and the fixed arm <NUM> of the clamping assembly <NUM> to be opened and closed with each other through the releasing member <NUM> so as to clamp a target object, the two releasing members <NUM> respectively controlling the movable arms <NUM> at two sides both have a telescopic movement in the annular portion <NUM>, and the annular portion <NUM> can restrict a movement direction of the releasing members <NUM>, so that the releasing members <NUM> have better straightness during the movement, and after the clamping of the target object is completed, the releasing members <NUM> separated from the movable arms <NUM> are retracted towards the proximal direction, and the separation of the releasing members <NUM> from the movable arms <NUM> can drive the retainer <NUM> to be retracted together with the releasing members <NUM>.

Exemplarily, as shown in <FIG>, taking the releasing member <NUM> being of a structure including the releasing lever <NUM> and the releasing portion <NUM> connected to the distal end of the releasing lever <NUM> as an example, with reference to <FIG> again, the width of the releasing portion <NUM> is generally set to be greater than the inner diameter of the annular portion <NUM>, in this way, as the width of the releasing portion <NUM> is greater than the inner diameter of the annular portion <NUM>, in the process of retracting the releasing member <NUM>, the claws <NUM> of the retainer <NUM> can be driven to separate from the elastic coupling with the clamp holder <NUM>, and retracted together with the releasing member <NUM>.

Alternatively, as shown in <FIG>, the three-arm clamp of the embodiments of the present disclosure further includes a handle assembly <NUM>, the handle assembly <NUM> includes a handle bracket <NUM> and two handle sliders <NUM> provided at two sides of the handle bracket <NUM> and respectively slidable on the handle bracket <NUM>, the proximal end of the releasing member <NUM> is connected to an operating wire, and the two handle sliders <NUM> are correspondingly connected to proximal ends of the operating wires at the same side, respectively. When the three-arm clamp of the embodiments of the present disclosure is applied to endoscopic surgery, the handle assembly <NUM> is operated outside the body, and connected to the operation part entering the body through the operating wire <NUM> and controls operation, and after the clamping operation in the body is completed, a part at the distal end other than clamping assembly <NUM> is withdrawn from the body through the control of the handle assembly <NUM>.

Optionally, as shown in <FIG> in combination with <FIG>, the proximal end of the clamp holder <NUM> is connected to one end of a spring tube <NUM>, the other end of the spring tube <NUM> is connected to the handle bracket <NUM>, and the operating wires <NUM> are provided in the spring tube <NUM>. The spring tube <NUM> itself has a certain flexible telescopic and bending capability, and by guiding the introduction or extraction of the operating wires <NUM> into or out of the body through the spring tube <NUM>, the operation difficulty can be reduced, and the spring tube <NUM> can protect the operating wires <NUM>.

Claim 1:
A three-arm clamp, comprising: a clamping assembly (<NUM>) and two releasing members (<NUM>) connected to the clamping assembly, wherein the clamping assembly (<NUM>) comprises a fixed arm (<NUM>) and two movable arms (<NUM>) respectively rotatably connected to the fixed arm (<NUM>) through a hinge pin (<NUM>), a first sliding slot (<NUM>) is provided at a proximal end of each of the movable arms (<NUM>), two sliding pins (<NUM>) are slidably provided in the first sliding slots (<NUM>) respectively, a clamp holder (<NUM>) is further provided at the proximal end of the fixed arm (<NUM>), an inner cavity is formed between the clamp holder (<NUM>) and the fixed arm (<NUM>), each of the releasing members (<NUM>) is inserted into the inner cavity and connected to the corresponding sliding pin (<NUM>), an elastic sheet (<NUM>) is further provided at the proximal end of each of the movable arms (<NUM>); when one of the movable arms (<NUM>) cooperates with the fixed arm (<NUM>) to realize clamping and closing, the corresponding elastic sheet (<NUM>) is folded in the inner cavity and abuts against the corresponding releasing member (<NUM>) along a radial direction of the fixed arm (<NUM>) from a connecting end to a free end; and when one of the releasing members (<NUM>) is detached from the corresponding movable arm (<NUM>), the free end of the corresponding elastic sheet (<NUM>) elastically abuts against an inner wall of the clamp holder (<NUM>).