Patent Description:
A thrombelastography device is an apparatus which is configured to test blood coagulation data of blood in vitro, and monitor the blood coagulation process from entire dynamic processes, such as platelet aggregation, blood coagulation and fibrinolysis, thereby obtaining rates of blood coagulation and fibrinolysis, the strength of coagulation and the like. The rates of blood coagulation and fibrinolysis and the strength of coagulation can be used as a basis for clinical diagnosis of diseases, such as cardiovascular and cerebrovascular diseases.

In the existing thrombelastography device, a cap of a cup needs to be buckled with a cup body containing liquid (e.g., blood) in blood testing. At the end of testing, since the blood may be adhered to the cap of the cup, it is necessary to replace the cap of the used cup in order to improve the accuracy in next testing.

Prior art related to the present application is seen in <CIT>. This discloses a measuring unit for measuring characteristics of a sample liquid, in particular viscoelastic characteristics of a blood sample, comprising a support member having at least one upper bearing arm with an upper bearing unit, at least one lower bearing arm with a lower bearing unit and a base for being attachable to a respective measuring system; a shaft having shaft toes and being rotatably supported about a rotation axis by said upper bearing unit and said lower bearing unit, wherein said upper bearing unit, said lower bearing unit and said shaft toes form toe bearings, respectively; an interface member having a detecting element and a drive element, said interface member being fixed on said shaft and being connected to a coupling shaft with a probe connector section for measuring characteristics of said sample liquid; wherein said interface member and the coupling shaft are coaxially aligned with said shaft. The disclosure is also directed to a corresponding measuring system.

In view of this, embodiments of the present invention provide a thrombelastography device according to independent claim <NUM>.

In the drawings, unless otherwise specified, the same reference numerals used throughout the drawings refer to the same or similar components and elements. It is should be understood that these drawings are merely illustrative of some embodiments of the present invention and are not to be construed as limiting the scope of the present invention.

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, without departing from the scope of the appended claims. Therefore, the drawings and description are to be regarded as exemplary, rather than restrictive.

In the description of the present invention, it should be understood that, the terms "center", "longitudinal", "transverse", "length", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like, which denote orientations or positional relationship, are based on the orientations or positional relationships shown in the drawings, for the purposes of describing the present invention and simplifying the description, do not indicate or imply that the device or component referred to necessarily has a specific orientation or is constructed and operated according to a specific orientation, and are therefore not to be construed as limiting the present invention. Thus, features defining "first" or "second" may include one or more of the described features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality of" is two or more, unless specifically defined otherwise.

As shown in <FIG>, an aspect of the present disclosure which may be used with the claimed invention provides a cap removal device. The cap removal device comprises a drive part <NUM>, a connection shaft <NUM>, and a cap removal member <NUM>, wherein.

The connection shaft <NUM> can further move downward under a driving force of the drive part <NUM>, such that the cap removal member <NUM> after the completion of the cap removal operation can be reset to prepare for the next cap removal operation. Here, the case where the connection shaft and the cap removal member are reset "under the driving force of the drive part" means that the drive part generates a downward driving force to the connection shaft, or the drive part reduces or eliminates an upward driving force applied to the connection shaft, such that the connection shaft and the cap removal member move downward under their own gravity to be reset.

The travel of the connection shaft that can move upward and downward under the driving force of the drive part is approximately <NUM>.

Specifically, when the connection shaft <NUM> moves downward under the driving force of the drive part <NUM>, the pivotal connection between the connection shaft <NUM> and the first end <NUM> rotates the cap removal member <NUM> around the pivot point <NUM> (in a counterclockwise as viewed from the angle in <FIG>), such that the second end <NUM> of the cap removal member <NUM> moves upward, the connection shaft <NUM> moves downward to its initial position, and the second end <NUM> of the cap removal member <NUM> moves upward to its initial position to complete resetting.

As shown in <FIG>, in order to facilitate flexible movement of the cap removal member <NUM>, the first end <NUM> of the cap removal member <NUM> is provided with a through hole <NUM>. The first end <NUM> passes through the through hole <NUM>, and is connected to a pivot shaft <NUM> of the connection shaft <NUM> and pivotally connected to the connection shaft <NUM>, such that the cap removal member <NUM> can rotate under the driving of the connection shaft <NUM>.

In an example, the drive part <NUM> drives the connection shaft <NUM> to move in a linear direction parallel to the axis of the connection shaft <NUM>. In order to prevent the occurrence of the problem that the movement failure occurs when the cap removal member <NUM> rotates relative to the connection shaft <NUM>, the dimension of the through hole <NUM> in the length direction of the cap removal member <NUM> may be larger than the diameter of the pivot shaft <NUM>, such that the pivot shaft <NUM> can slide in the through hole <NUM> when the connection shaft <NUM> moves upward and downward to drive the cap removal member <NUM> to rotate around the pivot point <NUM>, thereby ensuring a linear movement of the connection shaft <NUM> along its own axis direction and the circumferential movement of the cap removal member <NUM> along the fixed pivot point <NUM>. In another embodiment, the dimension of the through hole <NUM> is exactly matched with the diameter of the pivot shaft <NUM>, so that the pivot shaft <NUM> cannot translate within the through hole <NUM>. However, the position of the pivot point <NUM> relative to the cap removal member <NUM> is fixed. Specifically, the pivot shaft for pivotally connecting the cap removal member <NUM> at the pivot point <NUM> and the through hole, which is used for accommodating the pivot shaft, in the cap removal member <NUM> are arranged in such a manner: the dimension of the through hole in the length direction of the cap removal member <NUM> is larger than the diameter of the pivot shaft, such that when the connection shaft <NUM> moves upward and downward to drive the cap removal member <NUM> to rotate around the pivot point <NUM>, the pivot shaft can slide within the through hole, thereby ensuring that the connection shaft moves linearly along its own axis.

The cap removal device may further comprise a control unit which is configured to, in response to a cap removal request, control the drive part <NUM> to drive the connection shaft <NUM> to move upward. In an example, the cap removal request may be a signal indicating that previous measurement has been completed, which is detected by the control unit itself or detected by other components and sent to the control unit, or may be a cap removal request which is sent to the control unit or other components by a user through an input component. The control unit sends a control signal to the drive part <NUM> after receiving the cap removal request, and controls the drive part to operate, so as to drive the connection shaft <NUM> to move upward to an appropriate position where the cap can be removed, for example, the maximum travel position of the connection shaft. In this way, automatic control of the drive part <NUM> is achieved, automatic execution of the cap removal operation of the cap removal member <NUM> can be driven, the operation efficiency is improved, and therefore the cap <NUM> can be removed more conveniently.

In an example, after the control unit sends a control signal to cause the drive part to drive the connection shaft such that the cap removal member knocks off the cap for a predetermined time, for example, about <NUM> seconds after sending the control signal, the control unit may transmit to another control signal to the drive part, such that drive part applies a downward driving force to the connection shaft or reduces or eliminates the applied upward driving force, thereby resetting the connection shaft and the cap removal member.

In an example, the control unit may send a control signal to the drive part, such that the drive part drives the cap removal member to execute the cap removal operation for a plurality of times within a short time, thereby ensuring that the cap is knocked off.

As shown in <FIG>, the cap removal member <NUM> comprises a first part <NUM> and a second part <NUM> which are fixedly connected, wherein the first part <NUM> comprises a first end <NUM>, and the second part <NUM> comprises a second end <NUM>. The first part <NUM> and the second part <NUM> are arranged to form a certain inclination angle.

In an example, the first part <NUM> is arranged to form an inclination angle with the top surface of the cap, and the second part <NUM> is arranged to be substantially parallel to the top surface of the cap, such that when the first part <NUM> rotates around the pivot point <NUM>, the second end of the second part <NUM> can ensure the maximum contact with the top surface of the cap <NUM> and ensure that the cap <NUM> can be knocked off.

It needs to be noted that the included angle between the first part <NUM> and the second part <NUM> may be any appropriate angle, as long as the second end <NUM> of the cap removal member <NUM> is substantially parallel to the top surface of the cap <NUM>.

The pivot point <NUM> is located on the first part <NUM>, as shown in <FIG>.

In an example, the drive part <NUM> is an electromagnet, and at least a portion of the connection shaft <NUM> is composed of a material that can be attracted (or otherwise magnetically repelled) by the magnetic force of the magnet. In this example, the control unit controls, in response to the cap removal request, the supply of an appropriate current to the electromagnet, such that the electromagnet generates a magnetic force, and further the connection shaft moves upward under the attraction of the magnetic force. When a reset is required, the control unit may control to cut off or change the current supplied to the electromagnet, so that the magnetic force disappears or decreases, and further the connection shaft moves downward due to the gravity.

In another example, the drive member part is an electromagnet and at least a portion of the connection shaft <NUM> is a magnet material. In this example, the control unit controls, in response to the cap removal request, the supply of a current in an appropriate direction to the electromagnet, such that the electromagnet generates a magnetic force that is attracted to the connection shaft, and further the connection shaft moves upward under the attraction of the magnetic force. When a reset is required, the control unit may control to or reduce the current supplied to the electromagnet or change its current direction, such that the magnetic force disappears or decreases or becomes a magnetic force repelling the connection shaft, and further the connection shaft moves downward due to the gravity and/or repulsive force.

It will be appreciated that, in addition to the example of the electromagnet described above, the "drive part" herein may be any other component capable of driving the connection shaft to move, such as a motor, a lifting mechanism, or the like.

<FIG> is a schematic block diagram of a cap removal device which may be combined with the present invention. As shown in <FIG>, the cap removal device comprises a control unit <NUM>, a drive part <NUM>, a connection shaft <NUM> and a cap removal member <NUM>. The drive part <NUM> drives the connection shaft <NUM> to move upward under the control of the control unit <NUM>, thereby driving the cap removal member <NUM> whose one end is pivotally connected to the connection shaft to rotate around a fixed pivot point, and further allowing the other end of the cap removal member <NUM> to move downward to knock off the cap.

Although the cap removal device is shown and described herein for use with a thrombelastography device, those skilled in the art will recognize that the cap removal device may be used with other instrument devices as well.

In an embodiment of the thrombelastography device of the present invention, as shown in <FIG>, the cap <NUM> sleeves a rotary shaft <NUM>, the second end <NUM> is provided with an opening <NUM>, and the rotary shaft <NUM> passes through the opening <NUM> in a manner substantially perpendicular to the second end <NUM>, such that the second end <NUM> sleeves the rotary shaft <NUM>, and the cap <NUM> is located below the opening <NUM> on the rotary shaft <NUM>. In an example, a hole is formed in the center of the cap <NUM> and allows the rotary shaft <NUM> to pass through, wherein the diameter of the hole is slightly smaller than the diameter of the rotary shaft <NUM> in a natural state. In addition, the cap <NUM> is made of a material having appropriate flexibility, so that the cap can be sleeved and pressed against the rotary shaft <NUM>, and can be removed from the rotary shaft <NUM> while being subjected to an appropriate external force.

It should be noted that the width of the opening <NUM> is larger than the diameter of the rotary shaft <NUM>, that is, the opening <NUM> sleeves the rotary shaft <NUM> and does not contact the rotary shaft <NUM> when moving or being stationary, thereby avoiding the interference to the rotational movement of the rotary shaft <NUM> when the opening <NUM> is in contact with the rotary shaft <NUM> in case that the rotary shaft <NUM> rotates. Meanwhile, the width of the opening <NUM> should be not larger than the diameter of the cap <NUM>, i.e., when the second end <NUM> of the cap removal member <NUM> moves downward, the opening of the second end <NUM> can be ensured to come into contact with the cap <NUM>, thereby removing the cap <NUM>. In an example, the size of the opening <NUM> is adjustable.

In an example, in order to ensure that the cap <NUM> can be knocked off completely, the shape of the lower end surface of the second end <NUM> of the cap removal member <NUM> may be set to be substantially consistent with the shape of the cap <NUM>, thereby maximizing the contact area between the second end <NUM> and the cap <NUM>, so that the cap <NUM> can be removed from the rotary shaft <NUM> more easily.

In an embodiment of the present invention, as shown in <FIG>, the rotary shaft <NUM> is supported by the support <NUM>. The drive part <NUM> is fixed to a support <NUM>, and the cap removal member <NUM> is pivotally connected to the support <NUM> at the pivot point <NUM>. In an example, the cap removal member <NUM> is connected to the support <NUM> through a connection member. The connection member is fixedly connected to the support <NUM>, and the cap removal member <NUM> is pivotally connected to the connection member at the pivot point <NUM>.

As shown in <FIG>, the drive part <NUM> is fixedly connected to one side of the support <NUM>, and ensures that the drive part <NUM> can drive the connection shaft <NUM> to move upward and downward relative to the support <NUM> in a vertical direction. The pivot point <NUM> of the cap removal member <NUM> which is pivotally connected to the rotary shaft <NUM> is pivotally connected to the lower part (or the connection member) of the support <NUM>. The rotary shaft <NUM> is supported on the support <NUM> in a vertically downward manner. The opening <NUM> of the second end <NUM> of the cap removal member <NUM> sleeves a position, close to the tail end, of the rotary shaft <NUM>. The cap <NUM> sleeves the rotary shaft <NUM>, and is located below the opening <NUM>.

When the cap removal device operates, the control unit is configured to, in response to a cap removal request, control the drive part <NUM> to drive the connection shaft <NUM> to move upward. When the rotary shaft <NUM> moves upward, the first end <NUM> of the cap removal member <NUM>, which is connected to the connection shaft <NUM>, is pulled upward, thereby driving the cap removal member <NUM> to rotate around the pivot point <NUM>. When the first end <NUM> of the cap removal member <NUM> moves upward, the second end <NUM> moves downward till contacting the cap <NUM>. When the second end <NUM> continues to move downward, the lower end surface of the second end <NUM> is in contact with the top surface of the cap <NUM> and presses the cap <NUM>, such that the cap <NUM> is removed from the rotary shaft <NUM>, thereby completing the cap removal operation of the cap removal member <NUM>.

The connection shaft <NUM> may be driven downward by the control unit before the next cap removal operation is required. When the connection shaft <NUM> moves downward, the first end <NUM> of the cap removal member <NUM>, which is connected to the connection shaft <NUM>, moves downward together to drive the cap removal member <NUM> to rotate around the pivot point <NUM>. When the first end <NUM> of the cap removal member <NUM> moves downward, the second end <NUM> moves upward substantially along the rotary shaft <NUM> to an initial position, thereby completing a resetting operation of the cap removal member <NUM>.

An embodiment of the present invention according to the claims provides a thrombelastography device. As shown in <FIG>, the thrombelastography device comprises a support <NUM>, a rotary shaft <NUM> and may include the cap removal device, wherein.

In an embodiment of the present invention, as shown in <FIG>, the support comprises a fixed support part <NUM>, a movable support part <NUM>, a first connection part <NUM> and a second connection part <NUM>, wherein.

In an example as shown in <FIG>, the fixed support part <NUM> supports the movable support part and the supported object by means of the connection part, the first connection part <NUM> and the second connection part <NUM> in the connection part are connected together in a form of point contact, and the supported object which is in stress drives the movable support part <NUM> to rotate around the contact point between the first connection part <NUM> and the second connection part <NUM>. Since the first connection part <NUM> and the second connection part <NUM> are connected together in a form of point contact, when the movable support part <NUM> and the fixed support part <NUM> rotate relative to each other, only one contact point generates a frictional force to impede the rotation of the movable support part <NUM>. Therefore, the frictional force generated on the support may be reduced, and further the rotational resistance encountered when the supported object rotates is reduced.

In the embodiment provided by the present invention, the point connection may resides in that: two contact components are not in full contact and the contact area is less than a predetermined value. For example, when the first connection part <NUM> and the second fixed connection part <NUM> are connected together in a form of point contact, the contact area is less than <NUM> square millimeter.

In an example shown in <FIG>, the first connection part <NUM> comprises a jewel bearing <NUM>, and the second connection part <NUM> comprises a top cone <NUM>;
or.

As shown in <FIG>, the jewel bearing <NUM> is of a cake structure. The tapered groove <NUM> is formed in a plane of the jewel bearing <NUM>. The top cone <NUM> may be of a tapered structure. The tip of the top cone <NUM> is located in the groove <NUM>, and only the tip of the top cone <NUM> is in contact with the bottom of the groove <NUM>, such that the jewel bearing <NUM> is connected to the top cone <NUM> in a form of point contact. For example, when the tip of the top cone <NUM> has an area of <NUM> square millimeter, the top cone is connected to the tapered groove <NUM> of the jewel bearing <NUM> in a form of point contact by means of this tip having the area of <NUM> square millimeter.

In an embodiment of the present invention, the first connection part in the connection part may be a jewel bearing or a top cone. When the first connection part is the jewel bearing, the second connection part is a top cone. When the first connection part is the top cone, the second connection part is the jewel bearing. The structure of the support will be described below in the following cases in which the first connection part is the jewel bearing and the first connection part is the top cone, respectively.

In an embodiment of the present invention, as shown in <FIG>, the jewel bearing <NUM> which serves as the first connection part is fixedly connected to the fixed support part <NUM>, the top cone <NUM> which serves as the second connection part is fixedly connected to the movable support part <NUM>, and the tip of the top cone <NUM> is located in a groove of the jewel bearing <NUM> and is in point contact with the bottom of the groove of the jewel bearing <NUM>. The fixed support part <NUM> supports, by means of the jewel bearing <NUM>, the top cone <NUM> and the movable support part <NUM> which are fixedly connected.

In another embodiment of the present invention, as shown in <FIG>, the top cone <NUM> which serves as the first connection part is fixedly connected to the fixed support part <NUM>, the jewel bearing <NUM> which serves as the second connection part is fixedly connected to the movable support part <NUM>, and the tip of the top cone <NUM> is in point contact with the bottom of the jewel bearing <NUM>. The fixed support part <NUM> supports, by means of the top cone <NUM>, the jewel bearing <NUM> and the movable support part <NUM> which are fixedly connected.

In the present claimed invention, the support further comprises at least a pair of magnets;.

The support provided by the embodiment of the present invention will be further described below by taking the support which comprises two pairs of magnets as an example.

In an embodiment of the present invention, as shown in <FIG>, the support comprises two pairs of magnets. The first pair of magnets includes a magnet <NUM> and a magnet <NUM>. The second pair of magnets includes a magnet <NUM> and a magnet <NUM>. The magnet <NUM> and the magnet <NUM> are fixed to the fixed support part <NUM>, and the magnet <NUM> and the magnet <NUM> are fixed to the movable support part <NUM>. The magnet <NUM> and the magnet <NUM> in the first pair of magnets are stacked in parallel. The surfaces, which are close to each other, of the magnet <NUM> and the magnet <NUM> have magnetic poles which have the same polarity, for example, the N pole of the magnet <NUM> is directed to the movable support part <NUM>, and the N pole of the magnet <NUM> is directed to the fixed support part <NUM>; the magnet <NUM> and the magnet <NUM> in the second pair of magnets are stacked in parallel; the surfaces, which are close to each other, of the magnet <NUM> and the magnet <NUM> have magnetic poles which have the same polarity, for example, the S pole of the magnet <NUM> is directed to the movable support part <NUM>, and the S pole of the magnet <NUM> is directed to the fixed support part <NUM>.

In an embodiment of the present invention, the thrombelastography device further comprises a measurement device which is used for measuring a rotation angle of the rotary shaft, and forming a thrombelastogram corresponding to measured blood according to the rotation angle of the rotary shaft.

In an embodiment of the present invention, as shown <FIG>, the measurement device comprises at least one reflective sheet <NUM>, at least one light emitting module <NUM>, at least one light receiving module <NUM> and a processing module <NUM>, wherein.

In the thrombelastography device provided by the embodiment of the present invention, the reflective sheet reflects the light emitted by the light emitting module to the light receiving module. When the reflective sheet rotates under the driving of the rotary shaft, since the light emitting module emits light in a fixed direction, the amount of light received by the reflective sheet changes, and at the same time, the optical path of light reflected by the reflective sheet changes due to the rotation of the reflective sheet, resulting in a change in the intensity of light received by the light receiving module that receives the light in the fixed direction. The light receiving module converts the received light into a corresponding electrical signal according to the intensity of the light. The processing module determines the rotation angle of the rotary shaft according to the electrical signal. In this case, the light is taken as a signal for detecting the rotation angle of the rotary shaft. Since the intensity of the light does not change as external factors such as temperature change, the accuracy of detecting the rotation angle of the rotary shaft can be improved by detecting the rotation angle of the rotary shaft through light.

In an embodiment of the present invention, as shown in <FIG>, the light emitting module <NUM> comprises a light emitting diode <NUM> and a light guide column <NUM>, wherein the light emitting diode <NUM> emits light to the reflective sheet <NUM> through the light guide column <NUM>;
and/or
the light receiving module <NUM> comprises a photocell <NUM> and a light guide column <NUM>, wherein the photocell <NUM> receives light reflected by the reflective sheet <NUM> through the light guide column <NUM>.

In the embodiment of the present invention, since the inner surface of a second through hole <NUM> is a machined surface which has a certain roughness, if the light emitting diode <NUM> directly emits light to the reflective sheet <NUM>, the light emitted by the light emitting diode <NUM> will be diffusely reflected within the second through hole <NUM>, resulting in loss of light energy on the one hand, and difficulty in control over the direction and amount of light outgoing from the second through hole <NUM> on the other hand. The light emitted from the light emitting diode <NUM> is directed to the reflective sheet <NUM> through the light guide column <NUM>. The light emitted from the light emitting diode <NUM> is conducted inside the light guide column <NUM>, and may not be diffusely reflected, thereby improving the utilization rate of the light energy and ensuring that the light emitted from the second through hole <NUM> has a specific direction and a specific amount, and further ensuring the accuracy of detecting the rotation angle of the rotary shaft <NUM>.

In an embodiment of the present invention, each of the light receiving modules comprises a photocell and a light guide column which are fixed in a third through hole respectively, wherein the light guide column is located close to one of the reflective sheets. The light guide column receives the light reflected by the corresponding reflective sheet in a fixed direction, and transmits the received light to the photocell. The photocell converts the received light into a corresponding electrical signal according to the intensity of the light.

In an embodiment of the present invention, since the third through hole <NUM> is formed by machining, the inner surface of the third through hole <NUM> has a certain roughness. If the light reflected by the reflective sheet <NUM> directly enters the third through hole <NUM> and reaches the photocell <NUM>, the light will be diffusely reflected on the inner wall of the third through hole <NUM>, resulting in the loss of light energy. The energy of the light finally reaching the photocell <NUM> is less than the energy of the light entering the third through hole <NUM>, resulting in a relatively large error in the finally detected rotation angle of the rotary shaft <NUM>. The light reflected by the reflective sheet <NUM> is received by the light guide column <NUM>, and the light is transmitted inside the light guide column <NUM> and is not diffusely reflected during the transmission, thereby ensuring that the energy of the light received by the photocell <NUM> is equal to the energy of light reflected by the reflective sheet <NUM> to the light guide column <NUM>, and further ensuring the accuracy of detecting the rotation angle of the rotary shaft <NUM>.

In an embodiment of the present invention, the thrombelastography device further includes at least one light blocking sheet, the number of the light blocking sheets being equal to the number of the light guide columns, and each of the light blocking sheets corresponding to one of the light guide columns. Each light blocking sheet is provided with a light passing hole having a fixed shape and a fixed size. The light blocking sheet is arranged between the reflective sheet and the light guide column, so that the light reflected by the reflective sheet can only be emitted to the light guide column through the light passing hole in the light blocking sheet.

In an embodiment of the present invention, as shown in <FIG>, the thrombelastography device further comprises a position correction device <NUM>, wherein.

The present invention provides a thrombelastography device, wherein the rotary shaft is able to rotate under the support of the support, and the position correction device is connected to the rotary shaft. When the rotary shaft rotates away from a balanced position under the driving force of the measured blood, the position correction device is caused to generate an acting force for rotating the rotary shaft towards the balanced position. In this way, when the driving effect of the measured blood on the rotary shaft is removed, if the position where the rotary shaft is located is not the balanced position, the rotary shaft automatically returns to the balanced position under the acting force of the position correction device, and thus does not need to be calibrated by manual adjustment. Therefore, the time of calibrating the rotary shaft is saved, and the efficiency in blood coagulation measurement is improved.

As shown in <FIG>, the position correction device may comprise at least one hair spring <NUM>, wherein an inner ring of the hair spring <NUM> is fixedly connected to an outer circumferential surface of the rotary shaft <NUM>, and an outer ring of the hair spring is fixedly connected to the support <NUM>. When the rotary shaft <NUM> is in the balanced position, the hair spring <NUM> is in a free state, and does not exert an acting force on the rotary shaft <NUM>. When the rotary shaft <NUM> rotates under the driving force of the measured blood, the hair spring <NUM> rotates inward to deform or rotates outward to deform. The hair spring <NUM> restores an elastic force after being deformed. The function of restoring the elastic force is to restore the rotary shaft <NUM> to the balanced position, such that the hair spring <NUM> restores to the free state. When the driving force of the measured blood on the rotary shaft <NUM> is removed, if the position where the rotary shaft <NUM> is not the balanced position, the rotary shaft <NUM> rotates towards the balanced position as the hair spring <NUM> restores the elastic force, and finally the rotary shaft <NUM> restores to the balanced position.

In an embodiment of the present invention, when the position correction device <NUM> comprises two or more hair springs <NUM>, the spiral direction of at least one of the hair springs <NUM> from the inner ring to the outer ring is different from the spiral direction of the other hair spring <NUM> from the inner ring to the outer ring.

As shown in <FIG>, the position correction device comprises a hair spring <NUM> and a hair spring <NUM>, wherein inner rings of the hair spring <NUM> and the hair spring <NUM> are fixed to the rotary shaft <NUM> respectively, and outer rings of the hair spring <NUM> and the hair spring <NUM> are fixed to the support <NUM> respectively. As viewed from an observation position shown in <FIG>, the spiral direction of the hair spring <NUM> from the inner ring to the outer ring is clockwise, and the spiral direction of the hair spring <NUM> from the inner ring to the outer ring is counterclockwise. When the rotary shaft <NUM> rotates counterclockwise, the hair spring <NUM> is screwed, and when the rotary shaft <NUM> rotates clockwise, the hair spring <NUM> is screwed.

Since the hair spring outputs a stable acting force when it is screwed than the acting force output when it is unscrewed, the hair spring is set to a different spiral direction. When the rotary shaft rotates in different directions, there is always a corresponding hair spring that is screwed to provide an acting force for the rotary shaft to restore to the balanced position. By means of such a structure, on the one hand, the rotary shaft rotates more stably, and on the other hand, the plastic deformation caused by excessive unscrewing of the hair spring can be avoided.

In an embodiment of the present invention, the position correction device further comprises at least one zero setting module, wherein each zero setting module corresponds to one hair spring. One end of each zero setting module is fixedly connected to the support, and the other end of the zero setting module is fixedly connected to different positions on the outer ring of the corresponding hair spring in an adjustable manner, so as to adjust the balanced position.

As shown in <FIG>, the position correction device comprises a hair spring <NUM>, a hair spring <NUM>, a zero setting device <NUM>, and a zero setting device <NUM>, wherein the hair spring <NUM> corresponds to the zero setting device <NUM>, and the hair spring <NUM> corresponds to the zero setting device <NUM>. One end of the zero setting device <NUM> is fixedly connected to the support <NUM>, and the other end of the zero setting device <NUM> is fixed to the outer ring of the hair spring <NUM> by a U-shaped structure. A position, which is fixed to the U-shaped structure, on the outer ring of the hair spring <NUM> is adjustable. One end of the zero setting device <NUM> is fixedly connected to the support <NUM>, and the other end of the zero setting device is fixed to the outer ring of the hair spring <NUM> by a U-shaped structure. A position, which is fixed to the U-shaped structure, on the outer ring of the hair spring <NUM> is adjustable. The inner rings of the hair spring <NUM> and the hair spring <NUM> are fixed to the outer circumferential surface of the rotary shaft <NUM>.

Claim 1:
A thrombelastography device, comprising:
a rotary shaft (<NUM>) able to be sleeved with a cap (<NUM>) to be removed; and
a support (<NUM>) connected to one end of the rotary shaft (<NUM>) to support the rotary shaft, such that the rotary shaft (<NUM>) is able to rotate, wherein the support (<NUM>) comprises a fixed support part (<NUM>), a movable support part (<NUM>) fixedly connected to the rotary shaft (<NUM>), a first connection part (<NUM>) and a second connection part (<NUM>),
the first connection part (<NUM>) is fixedly connected to the fixed support part (<NUM>), the second connection part (<NUM>) is fixedly connected to the movable support part (<NUM>), and the first connection part (<NUM>) and the second connection part (<NUM>) are connected together in a form of point contact, such that the moveable support part (<NUM>) is able to rotate relative to the fixed support part (<NUM>) via a single contact point;
the movable support part (<NUM>) rotates relative to the fixed support part (<NUM>) under the driving force of the rotary shaft (<NUM>) by means of the point contact between the first connection part (<NUM>) and the second connection part (<NUM>) wherein
the support further comprises at least a pair of magnets (<NUM>, <NUM>; <NUM>, <NUM>);
in each pair of magnets, the first magnet (<NUM>; <NUM>) is fixed to one side, close to the movable support part (<NUM>), on the fixed support part (<NUM>), and the second magnet (<NUM>; <NUM>) is fixed to one side, close to the fixed support part (<NUM>), on the movable support part (<NUM>); and
the first magnet (<NUM>; <NUM>) and the second magnet (<NUM>; <NUM>) are stacked in parallel, and two surfaces that are close each other are the like magnetic poles.