Medical clamping device

Abstract

The medical clamping device comprises a base, an adjusting seat, a clamping unit, a first connecting part, a second connecting part, and a locking unit. The adjusting seat moves relative to the base to adjust the opening angle of the clamping unit. The first connecting part and the second connecting part are connected in the clamping state and are disconnected in the non-clamping state. The locking unit can slide relative to the base and the adjusting seat. When the locking unit slides to the first position, the first connecting part and the second connecting part are locked and the opening angle is fixed. When the locking unit slides to the second position, the first connecting part and the second connecting part are unlocked. The device can provide stable locking force, ensure the clamping unit to maintain a stable clamping angle, and improve the reliability and use experience of the device.

Description

Technical Field

[0001] This disclosure relates to the field of medical device technology, specifically to a medical clamping device. Background Technology

[0002] Currently, common valvular regurgitation in mitral, tricuspid, aortic, and pulmonary valves is a primary cause of valve insufficiency. Taking the mitral valve as an example, during systole, some blood from the left ventricle flows back into the left atrium through the insufficiently closed mitral valve. The left atrium simultaneously receives blood from the regurgitated blood from the left ventricle and blood from the pulmonary veins, leading to a significant increase in blood volume and pressure, resulting in left atrial hypertrophy. During diastole, even more blood flows from the left atrium to the left ventricle, causing the left ventricle to hypertrophy due to increased contraction. Ultimately, this leads to heart failure in both the left atrium and left ventricle, subsequently resulting in pulmonary congestion, pulmonary hypertension, right ventricular hypertrophy, right atrial hypertrophy, right heart failure, and systemic circulatory congestion. Current technologies primarily employ clamping devices to treat mitral and tricuspid valve insufficiency. After capturing the valve leaflets and closing the clamping tissue, these devices require locking to prevent tissue dislodgement and maintain the closed state, thus keeping the clamping arms at a constant angle after closure. However, in practice, due to variations in the thickness of the target tissue leaflets, the closing angle of the clamping arm in the closed state also varies. Therefore, the clamping device needs to maintain a good locking effect at different closing angles. Existing technologies often utilize friction to grip the control rod, keeping the clamping device locked. However, existing solutions struggle to provide sufficient friction, and the surface where the friction is applied carries a risk of slippage, preventing the clamping device from providing a stable locking effect and even causing the target tissue to detach from the clamping device. Based on the above analysis, it is evident that there is an urgent need for a clamping device with a more stable locking structure, thereby enabling more reliable valve repair and ultimately solving at least one of the aforementioned technical problems. Summary of the Invention

[0003] In order to overcome at least one of the many problems in the related art, this disclosure provides a medical clamping device.

[0004] The medical clamping device includes: A base and an adjusting seat, wherein the adjusting seat moves relative to the base to adjust the opening and closing angle of the clamping unit; A clamping unit, which is respectively connected to the base and the adjusting seat; The base is provided with a first connecting part; The adjusting seat is provided with a second connecting part; In the clamping state, the first connecting part and the second connecting part are engaged and connected; in the non-clamping state, the first connecting part and the second connecting part are disengaged. A locking unit that can slide relative to the base and the adjusting seat; When the locking unit slides to the first position, it locks the first and second connecting parts that are already connected and fixes the opening angle; when the locking unit slides to the second position, it unlocks the first and second connecting parts.

[0005] In some optional embodiments, the adjusting seat includes an elastic portion, which constrains the locking unit to switch between a first position and a second position.

[0006] In some optional embodiments, the locking unit includes a pusher portion for locking or unlocking the first connecting portion and the second connecting portion; Viewed radially from the base, when the projection of the elastic part covers the pushing part, the locking unit is in the second position; when the projection of the elastic part does not cover the pushing part, the locking unit is in the first position.

[0007] In some optional embodiments, the elastic portion includes a free end extending along the axial direction of the adjusting seat; A first limiting part is provided on one end of the base near the adjusting seat; The free end and the first limiting part constrain the position of the locking unit so that the locking unit is held in the first position.

[0008] In some optional embodiments, the adjusting seat includes a central shaft portion, the elastic portion is disposed on the central shaft portion, and the end of the elastic portion near the base is a free end.

[0009] In some optional embodiments, the end of the central shaft near the base is connected to the conveying system, and the conveying system adjusts the position of the central shaft to change the position of the adjusting seat relative to the base, and adjusts the engagement state of the first connecting part and the second connecting part.

[0010] In some optional embodiments, the elastic part includes a first guide part, and the pushing part includes a second guide part; The first guide part and the second guide part cooperate to deform the elastic part by pressing the pushing part, thereby causing the locking unit to move to the second position.

[0011] In some optional embodiments, the first connecting portion includes a plurality of first snap-fit ​​portions extending along the axial direction of the base; The second connecting portion includes a plurality of second snap-fit ​​portions extending along the axial direction of the adjusting seat; At least one of the first latching portions is selectively latched to at least one of the second latching portions, so that the opening and closing angle is adjustable in multiple levels.

[0012] In some optional embodiments, the clamping unit includes at least two lower clamping arms, each of which is pivotally connected to the base and can be adjusted to form different opening and closing angles by the movement of the adjusting seat relative to the base.

[0013] In some optional embodiments, the clamping unit further includes at least two upper clamping arms, each of which is connected to the base and can be driven to move closer to or further away from the lower clamping arm.

[0014] In some optional embodiments, the clamping unit further includes an elastic arm, one end of which is pivotally connected to the lower clamping arm; the other end of which is pivotally connected to the adjusting seat, or the other end of which is fixedly connected to the adjusting seat.

[0015] The technical solution disclosed herein has the following advantages or beneficial effects: (1) In this disclosure, the first connecting part and the second connecting part are used to control the base and the adjusting seat to switch between rapid adjustment and fine adjustment. When the opening and closing angle of the clamping unit is in the fine adjustment state, the locking unit can lock the first connecting part and the second connecting part at any time, so that the opening and closing angle remains stable. When it is necessary to readjust the opening and closing angle, it is only necessary to slide the locking unit to release the constraint relationship between the first connecting part and the second connecting part. The locking unit can provide a stable locking effect, avoiding the problem that the opening and closing angle of the clamping unit is unstable due to external force when the instrument is clamped. At the same time, the locking unit can control the instrument to switch between the locking and unlocking states by sliding to change its position, so that the instrument locking opening and closing angle can be easily, safely and reliably achieved, and the structure is simple and the cost is low. The locking unit includes a pushing surface provided on the pushing part. The pushing surface serves as a locking and unlocking element, making it simpler and more efficient to unlock or lock the first connecting part and the second connecting part by sliding, and the manufacturing cost is low.

[0016] (2) The adjusting seat of this disclosure includes an elastic part. The elastic part is provided so that the locking unit can be stably in the first position, thereby providing a stable locking force for the first connecting part and the second connecting part, ensuring that the first connecting part and the second connecting part do not move relative to each other, and ultimately keeping the opening and closing angle of the clamping unit stable.

[0017] (3) In this disclosure, the unlocking surface on the central shaft is used to constrain the displacement of the pushing part towards the adjusting seat, preventing the locking unit from disengaging from the device. At the same time, the unlocking surface can also indicate to the user that the locking unit has reached its limit position and that the locking effect between the first connecting part and the second connecting part has been released.

[0018] (4) In this disclosure, the first connecting portion includes a plurality of first snap-fit ​​portions extending along the axial direction of the base; the second connecting portion includes a plurality of second snap-fit ​​portions extending along the axial direction of the adjusting seat; at least one of the first snap-fit ​​portions is selectively snapped into contact with at least one of the second snap-fit ​​portions to make the opening and closing angles multi-level adjustable. That is, the instrument can finely adjust the opening and closing angles of the clamping unit to maintain different clamping states to adapt to tissues of different thicknesses, thereby increasing the instrument's range of applications.

[0019] (5) In this disclosure, after clamping, the elastic arm can be compressed, so that the closing angle of the clamping arm can adapt to target tissues of different thicknesses, thereby improving the compatibility of the instrument. At the same time, with different mating depths of the first and second connecting parts, the clamping unit can be closed and maintained at different opening and closing angles. With the elastic arm, the opening and closing angle can be finely and adaptively adjusted, making the instrument applicable to a wider range of target leaflet thicknesses. Attached Figure Description

[0020] The accompanying drawings are provided to better understand this disclosure and do not constitute an undue limitation thereof. Wherein: Figure 1 This is a schematic diagram of a longitudinal section in the first direction of the medical clamping device in the snap-fit ​​state according to an embodiment of the present disclosure; Figure 2 This is an isometric view of a medical clamping device according to an embodiment of the present disclosure; Figure 3 This is a schematic diagram of a second longitudinal section of a medical clamping device according to an embodiment of the present disclosure; Figure 4 This is an exploded view of a medical clamping device according to an embodiment of the present disclosure; Figure 5 This is another axonometric view of a medical clamping device according to an embodiment of the present disclosure; Figure 6 This is a schematic diagram of a longitudinal section in the first direction of the medical clamping device in an unengaged state according to an embodiment of the present disclosure; Figure 7 This is a perspective view of the base of a medical clamping device according to an embodiment of the present disclosure; Figure 8 This is a schematic longitudinal section of the base of a medical clamping device according to an embodiment of the present disclosure; Figure 9 This is a partial structural schematic diagram of the adjustment seat of the medical clamping device according to an embodiment of the present disclosure; Figure 10 This is a perspective view of the central shaft portion of a medical clamping device according to an embodiment of the present disclosure; Figure 11 This is a perspective view of the locking unit of a medical clamping device according to an embodiment of the present disclosure; Figure 12 This is a perspective view of the locking unit of a medical clamping device according to an embodiment of the present disclosure; Figure 13 This is a schematic diagram of a longitudinal section in the first direction of the medical clamping device in the first snap-fit ​​and locked state according to an embodiment of the present disclosure; Figure 14 This is a schematic diagram of a longitudinal section in the first direction of the medical clamping device in the second snap-fit ​​and locked state according to an embodiment of the present disclosure; Figure 15 This is a schematic diagram of the clamping process of a medical clamping device according to an embodiment of the present disclosure; Figure 16 This is a schematic diagram of the clamping and locking state of a medical clamping device according to an embodiment of the present disclosure; Figure 17 This is a partial structural schematic diagram of another adjustment seat of a medical clamping device according to an embodiment of the present disclosure.

[0021] Explanation of reference numerals in the attached figures: 101-Pushing part, 201-Base, 202-Adjusting seat, 203-Lower clamping arm, 204-Elastic arm, 205-Upper clamping arm, 206-First interface part, 207-Third interface part, 208-First rotating shaft, 209-Second rotating shaft, 301-Locking unit, 302-Central shaft part, 601-Fulcrum, 602-First limiting part, 611-First connecting part, 701-Second connecting part, 702-Pushing surface, 703 - Socket, 801 - Bottom end, 802 - Elastic part, 803 - Free end, 804 - Unlocking surface, 805 - Second interface part, 3011 - Pushing surface, 3012 - Locking unit through hole, 3013 - Second guide part, 3014 - Fourth interface part, 3015 - Locking surface, 1201 - First snap-fit ​​position, 1202 - Second snap-fit ​​position, 1301 - Clamping part, 1302 - Target tissue, 1401 - Elastic arm angle. Detailed Implementation

[0022] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0023] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0024] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0025] To address the problem in existing technologies where clamping instruments struggle to maintain a stable clamping angle and provide a consistent locking effect for target tissues of varying thicknesses, this invention provides a medical clamping device in some embodiments. This medical clamping device includes: a base and an adjusting seat, the adjusting seat moving relative to the base to adjust the opening angle of a clamping unit; a clamping unit connected to both the base and the adjusting seat; a first connecting portion on the base; and a second connecting portion on the adjusting seat; in the clamping state, the first and second connecting portions are engaged; in the non-clamping state, they are disengaged; and a locking unit slidable relative to the base and the adjusting seat; when the locking unit slides to a first position, it locks the engaged first and second connecting portions and fixes the opening angle; when the locking unit slides to a second position, it unlocks the first and second connecting portions.

[0026] like Figures 1 to 9As shown in the embodiments, the main body of the medical clamping device in some embodiments of the present invention includes a base 201 and an adjusting seat 202, as well as corresponding components disposed on the base 201 and the adjusting seat 202. In particular, the clamping unit disposed on the base 201 and the adjusting seat 202 is used to clamp the target tissue, and the opening and closing angle of the clamping unit is adjusted under the control of the operator to achieve the final treatment purpose. In some embodiments, to facilitate adjustment and control of the opening and closing angle of the clamping unit, this purpose is achieved by controlling the movement of the adjusting seat 202 relative to the base 201. In practice, different patients or different target tissues have different thicknesses and different clamping angle requirements; therefore, it is particularly important to quickly adjust the opening and closing angle of the clamping unit through the adjusting seat 202 and the base 201. In some embodiments, the clamping unit is connected to the base 201 and the adjusting seat 202 respectively, so that when the base 201 and the adjusting seat 202 are relatively displaced, a force is generated on the clamping unit, thereby changing the opening and closing angle of the clamping unit. That is, there is a cooperative motion relationship between the clamping unit and the adjusting seat and / or base. The base has a first connecting part 611, and the adjusting seat has a second connecting part 701. The first connecting part 611 and the second connecting part 701 are respectively provided on two different, separate components, thus allowing for a connection or disconnection relationship between them. When the first connecting part 611 and the second connecting part 701 are disconnected, the adjusting seat and the base can move independently. In practice, in this state, the positional relationship between the adjusting seat and the base can be quickly changed to achieve rapid adjustment of the opening angle of the clamping unit. However, when the first connecting part 611 and the second connecting part 701 are engaged, the motion relationship between the base and the adjusting seat will be constrained, and the distance between them cannot be quickly changed. However, by rationally designing the engagement structure between the first and second connecting parts, fine adjustment of the opening angle can be achieved. To achieve the aforementioned rapid and fine adjustment control, in some embodiments, the first connecting part and the second connecting part are engaged in the clamping state, and disengaged in the non-clamping state. Furthermore, the medical clamping device also includes a locking unit that can slide relative to the base and the adjusting seat. Figure 5The locking unit 301 shown can slide relative to the axis of the base. Specifically, the locking unit 301 is disposed within the inner hole of the base and can slide along the axis of the inner hole of the base, thereby adjusting the positional relationship of the locking unit 301 relative to the base and the adjusting seat. When the locking unit 301 slides to the first position, it locks the first and second connecting parts that are already engaged and fixes the opening and closing angle; when the locking unit slides to the second position, it unlocks the first and second connecting parts. Figure 13 As shown, after the relative movement of the control adjustment seat and the base causes the first connecting part and the second connecting part to engage, the locking unit 301 is then slid to the first position. At this position, the locking unit constrains the positional relationship between the first connecting part and the second connecting part, thereby fixing the position between the base and the adjustment seat, ultimately maintaining the opening angle of the clamping unit at the desired position. Therefore, when using the clamping unit, the operator only needs to adjust the positional relationship between the first connecting part and the second connecting part until the opening angle of the clamping unit reaches the desired value, and then fix the opening angle using the locking unit. It should be noted that "fixed" here refers to a relatively stable opening angle, not a completely still state. For example, under the action of the elastic arm described later, the opening angle can be finely adjusted according to the force exerted by the tissue, ensuring that the clamping unit stably follows the movement of the tissue and preventing the tissue from detaching from the clamping unit. Figure 1As shown, the locking unit 301 is located in the second position, which cannot provide constraint on the first and second connecting parts. When the locking unit is in this position, the positions of the adjusting seat and the base are only relatively fixed; the first and second connecting parts are not locked and can still move relative to each other when subjected to external force. As the displacement between the adjusting seat and the base increases, the first and second connecting parts will gradually release their engagement, allowing the adjusting seat and the base to regain their rapid adjustment relationship. Therefore, when the operator is not satisfied with the current opening angle, the locking unit can be slid from the first position to the second position to release the locking effect on the first and second connecting parts, and then the adjusting seat can be moved away from the base to disengage the first and second connecting parts. From the above description, it can be seen that in the above embodiment, the first and second connecting parts are used to control the switching between rapid and fine adjustment of the base and the adjusting seat. Furthermore, when the opening angle of the clamping unit is in fine adjustment mode, the locking unit can lock the first and second connecting parts at any time, thereby keeping the opening angle stable. When the opening and closing angle needs to be readjusted, simply slide the locking unit to release the constraint on the first and second connecting parts. The locking unit provides a stable locking action, preventing instability in the opening and closing angle of the clamping unit due to external forces while the instrument is being held. Furthermore, the locking unit allows for easy and reliable switching between the locked and unlocked states by sliding its position, making it easy, safe, and reliable to lock the opening and closing angle of the instrument. The structure is simple and inexpensive.

[0027] In some optional embodiments, the adjusting seat includes an elastic portion, and the elastic portion constrains the locking unit to switch between a first position and a second position. For example... Figure 1 , Figure 10 and Figure 13 In the illustrated embodiment, the adjusting seat is provided with an elastic portion 802. The elastic portion 802 is arc-shaped and offset from the axis of the base, or at least partially extends radially away from the axis of the base. Under the action of an external force, the elastic portion can be compressed and moved towards the axis of the base. After the external force is reduced or removed, the elastic portion will move away from the axis of the base and return to its initial state. Figure 13As shown, when the locking unit moves to the first position, the lower end of the locking unit can abut against the end of the elastic part near the base, or move away from the elastic part. Without external force, the locking unit cannot break through the constraint of the elastic part and will always remain in the first position. Therefore, the elastic part allows the locking unit to be stably positioned in the first position, thereby providing a stable locking force to the first and second connecting parts, ensuring that the first and second connecting parts do not move relative to each other, and ultimately keeping the opening angle of the clamping unit stable. That is, when there is no external force or the external force is small, the elastic part can stably constrain the position of the locking unit.

[0028] In some optional embodiments, the locking unit includes a pushing portion for locking or unlocking the first connecting portion and the second connecting portion; viewed radially from the base, when the projection of the elastic portion covers the pushing portion, the locking unit is in a second position; when the projection of the elastic portion does not cover the pushing portion, the locking unit is in a first position. Figure 1 , Figures 11 to 13 In the illustrated embodiment, the locking unit includes a pushing part 101, which is located at one end of the locking unit and close to the adjusting seat. The outer wall of the pushing part 101 has a pushing surface 3011, which is used to lock or unlock the first connecting part and the second connecting part. Because a pushing surface is used as the locking and unlocking element, unlocking or locking the first and second connecting parts by sliding is simpler and more efficient, and the manufacturing cost is low. Furthermore, the center of the locking unit has a locking unit through hole 3012, which allows the locking unit to be fitted onto the adjusting seat and to slide relative to the adjusting seat. Figure 1 and Figure 13 In the illustrated embodiment, viewed radially from the base, the locking unit is in the second position when the projection of the elastic portion covers the pushing portion. This coverage includes three scenarios: full coverage, partial coverage, and most coverage. Figure 1As shown, the projection of the elastic part in the radial direction largely covers the pushing part. At this time, the locking unit is in the second position and cannot provide a pushing force for the first and second connecting parts, thus keeping the first and second connecting parts unlocked. Since the elastic part has the ability to return to its initial state without external force, when the pushing part is in the second position, the free end of the elastic part can constrain the pushing part to slide along the axis of the base. Driven by the conveying system, the pushing part enters the first position and is limited between the first limiting part 602 and the free end 803. When the projection of the elastic part does not cover the pushing part, the locking unit is in the first position. Figure 13 In the illustrated embodiment, the projections of the elastic portion and the pushing portion in the radial direction do not coincide. In this case, the pushing portion is located in the first position and provides a locking effect for the first connecting portion and the second connecting portion. For example... Figures 11 to 13 In the described embodiment, a locking surface 3015 is provided on the top surface of the pushing part near the base. The locking unit has a through hole arranged radially above the locking surface 3015. Figure 9 In the example shown, the adjusting seat is provided with a second connecting portion extending along the axis of the base, and the portion of the second connecting portion near the axis has a pushing surface 702. Figure 1 As shown, when the free end of the elastic part extends into the through hole, the pushing part is clamped between the elastic part and the pushing surface 702. In this state, the conveying system, together with the elastic part, constrains and maintains the position of the pushing part, ensuring that the first connecting part and the second connecting part are not locked together.

[0029] In some optional embodiments, the elastic portion includes a free end extending along the axial direction of the adjusting seat; a first limiting portion is provided on the base near one end of the adjusting seat; the free end and the first limiting portion constrain the position of the locking unit so that the locking unit is held in the first position. Figure 10 In the illustrated embodiment, the elastic portion includes a free end portion 803. For example... Figure 7 and 8 As shown, the bottom end of the base includes a first limiting portion 602. In some embodiments, the first limiting portion 602 can be a stepped surface disposed within an axially extending stepped through hole in the base. When the locking unit slides to... Figure 13When the position is shown, without external force or with insufficient force to move the elastic part, the end of the pushing part near the adjusting seat is constrained by the free end 803 and cannot break through the elastic part to slide towards the adjusting seat. Simultaneously, due to the limiting effect of the first limiting part, the locking surface 3015 of the pushing part is limited by the first limiting part 602 and cannot continue to move away from the adjusting seat. Therefore, under the limiting effects of the free end and the first limiting part, when the locking unit is in the first position, it will be constrained between the free end and the first limiting part, thereby ensuring that the pushing surface 3011 of the pushing part stably abuts against the pushing surface 702, and providing a stable locking constraint for the first connecting part and the second connecting part.

[0030] In some optional embodiments, the adjusting seat includes a central shaft portion 302, the elastic portion is disposed on the central shaft portion, and the end of the elastic portion near the base is a free end. For example... Figure 10 In the described embodiment, the adjusting seat includes a central shaft portion, which can be, for example, Figure 10 The independent components shown are fixed to the adjusting seat by welding or threaded connection; of course, the central shaft can also be formed as an integral part with the adjusting seat. Figure 10 As shown, the bottom end 801 of the central shaft portion is provided with an unlocking surface 804, and the top end is provided with a second interface portion 805. The unlocking surface 804 is used to constrain the displacement of the pushing part towards the adjusting seat, preventing the locking unit from disengaging from the device. Simultaneously, the unlocking surface also indicates to the user that the locking unit has reached its limit position, and the locking effect between the first connecting part and the second connecting part has been released. It is understood that during operation, the user only needs to control the locking unit to slide towards the adjusting seat, and when it finds that it cannot slide further, the unlocking operation is confirmed to be complete. Furthermore, the elastic part is provided on the central shaft portion, and the end of the elastic part near the base is a free end 803. The free end 803 is the part of the elastic part with the largest displacement.

[0031] In some optional embodiments, the end of the central shaft near the base is connected to a conveying system, which adjusts the position of the central shaft to change the position of the adjusting seat relative to the base and adjusts the engagement state of the first connecting part and the second connecting part. Figure 10 In the illustrated embodiment, the second interface is used to connect to a conveying system, thereby changing the relative position between the adjusting seat and the base via the conveying system. Figure 9In the illustrated embodiment, the adjusting seat has at least one second connecting portion 701 at one end near the base, and a receiving seat 703 at the end away from the base. The receiving seat 703 can be a through hole, allowing the central shaft portion to pass through and be fixedly connected to the receiving seat 703. Figure 8 As shown, at least one first connecting part is provided in the stepped hole near the adjusting seat of the base. In the engaged state, the second connecting part is inserted into the stepped hole and engages with the first connecting part.

[0032] In some optional embodiments, the elastic portion includes a first guide portion, and the pushing portion includes a second guide portion 3013; the first guide portion and the second guide portion cooperate to deform the elastic portion by pressing it against the pushing portion, thereby causing the locking unit to move to a second position. For example... Figure 11 As shown, the second guide portion 3013 can be a chamfered, rounded, or beveled structure, etc. Correspondingly, the first guide portion can also be a chamfered, rounded, or beveled structure disposed on the free end of the elastic portion. The first and second guide portions work together to guide the pushing portion to smoothly push the free end towards the axis of the base; ultimately causing the pushing portion to enter the second position defined by the free end and the unlocking surface 804.

[0033] In some optional embodiments, the first connecting portion includes a plurality of first engaging portions extending axially along the base; the second connecting portion includes a plurality of second engaging portions extending axially along the adjusting seat; at least one of the first engaging portions selectively engages with at least one of the second engaging portions to make the opening and closing angle multi-level adjustable. Figure 8 and 9 In the illustrated embodiment, the first connecting portion includes a plurality of consecutively arranged first engaging portions, and the second connecting portion includes a plurality of consecutively arranged second engaging portions. The first and second engaging portions are correspondingly arranged, allowing the first engaging portions to smoothly engage with the second engaging portions. It is understood that the more numerous and denser the first and second engaging portions, the higher the accuracy of the opening and closing angle achievable through fine adjustment. In some embodiments, the first and second engaging portions are both connected in a serrated or rack-like shape. Figure 13 and Figure 14 In the illustrated embodiment, the first connecting part and the second connecting part can be engaged at different positions to achieve adjustment of different opening and closing angles. Figure 13 As shown, the first connecting part and the second connecting part engage at the first engaging position 1201, where the contact area is at its maximum and the opening and closing angle of the instrument is at its minimum. Figure 14As shown, the first connecting part and the second connecting part engage at the second engaging position 1202. The contact portion at this position is less than that at the first engaging position, and the opening and closing angle of the instrument is greater at this position compared to the first engaging position. Figure 13 The position will be increased. As a result, the instrument can finely adjust the opening and closing angle of the clamping unit to maintain different clamping states to adapt to tissues of different thicknesses, thus increasing the instrument's range of applications.

[0034] like Figure 1 In the described embodiment, a first interface portion 206 is provided on the end of the base away from the adjustment seat. The first interface portion 206 is used to connect to the conveying system and, under the control of the conveying system, enter the body and move towards the target position. Correspondingly, as... Figure 11 As shown, the locking unit has a fourth interface 3014 at the end away from the adjusting seat. The fourth interface is used for connection to the conveying system and is controlled by the conveying system to change the position of the locking unit relative to the base and / or the adjusting seat.

[0035] In some optional embodiments, the clamping unit includes at least two lower clamping arms, each of which is pivotally connected to the base and can form different opening and closing angles by the movement of the adjusting seat relative to the base. Figures 2 to 5 In the illustrated embodiment, a fulcrum 601 is provided on the base for mounting the lower clamping arm 203. The fulcrums are distributed at 180° intervals in the circumferential direction. One end of the lower clamping arm has two through holes, which are respectively sleeved and connected to the fulcrums, allowing the lower clamping arm to rotate along the fulcrum 601. The medical device also includes an elastic arm 204, the two ends of which are connected to the adjusting seat and the lower clamping arm via a first rotating shaft 208 and a second rotating shaft 209, respectively. The second rotating shaft 209 is pivotally connected to the middle of the lower clamping arm. The first rotating shaft 208 is pivotally connected to the base. When the base moves relative to the adjusting seat, the adjusting seat transmits the load to the lower clamping arm through the elastic arm to adjust the opening and closing state of the lower clamping arm. Advantageously, after clamping, the elastic arm can be compressed, allowing the closing angle of the clamping arm to adapt to target tissues of different thicknesses, improving device compatibility. Figure 17In the illustrated embodiment, the elastic arm and the adjusting seat can be formed as an integral part, or the elastic arm can be directly fixed to the adjusting seat instead of being connected to it via a pivot. In this fixed connection state, the elastic arm can elastically deform and rotate around its connection point with the adjusting seat, thereby changing the size of the included angle 1401. In some optional embodiments, the total number of fulcrums 601 is four, divided into two groups, each group hinged to the end of a lower clamping arm. The two groups of fulcrums are symmetrically arranged in the circumferential direction. Correspondingly, each lower clamping arm has two through holes at its end for hinged to its corresponding two fulcrums. After assembly, the lower clamping arms are distributed 180° in the circumferential direction and can rotate along their respective hinge fulcrums to move closer to or further away from each other. In this design, the geometry of the two lower clamping arms can be set to be identical, thereby reducing manufacturing costs and facilitating assembly.

[0036] In some optional embodiments, the clamping unit further includes at least two upper clamping arms 205, each of which is connected to the base and can be driven to move closer to or further away from the lower clamping arm. Figure 2 As shown, the end of the upper clamping arm is fixedly connected to the base, allowing the upper clamping arm to rotate along a fixed point. Furthermore, the upper clamping arm has several barbs protruding from the side facing the lower clamping arm. When the clamping portion 1302 formed by the lower and upper clamping arms abuts against and clamps the target tissue 1302, the barbs penetrate the target tissue, causing the clamping arm to stably anchor the target tissue. Figure 2 In the described embodiment, the free end of the upper clamping arm is further provided with a third interface 207 for connection to a pull cable of the conveying system. The other end of the pull cable extends proximally through the conveying system to facilitate operator operation. The pull cable is used to adjust the opening angle of the upper clamping arm. In some optional embodiments, the upper clamping arm is made of a shape-memory material. It is understood that only when the upper clamping arm has sufficient elastic restoring force can it stably cooperate with the lower clamping arm after the pull cable tension is removed, and provide sufficient clamping load to the target tissue. Figures 15 to 16 In the illustrated embodiment, once the target tissue position is reached, the upper and lower clamping arms are first controlled to move and clamp the target tissue. Then, the positions of the first and second connecting parts are adjusted. Finally, the two connecting parts are locked by the locking unit to form a... Figure 16 The retracted state completes the device implantation process.

[0037] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art, after considering the specification and practicing the technical solutions disclosed in this application, will readily conceive of other embodiments of this disclosure. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary technical means in the art not disclosed in this disclosure. The specification and embodiments are considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0038] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A medical clamping device, comprising: A base and an adjusting seat, wherein the adjusting seat moves relative to the base to adjust the opening and closing angle of the clamping unit; A clamping unit, which is respectively connected to the base and the adjusting seat; Its features are, The base is provided with a first connecting part; The adjusting seat is provided with a second connecting part; In the clamping state, the first connecting part and the second connecting part are engaged and connected; in the non-clamping state, the first connecting part and the second connecting part are disengaged. A locking unit that can slide relative to the base and the adjusting seat; When the locking unit slides to the first position, it locks the first and second connecting parts that are already connected and fixes the opening angle; when the locking unit slides to the second position, it unlocks the first and second connecting parts. The adjusting seat includes an elastic part, and the elastic part constrains and locks the unit to switch between a first position and a second position; The locking unit includes a pushing part, which is used to lock or unlock the first connecting part and the second connecting part; Viewed radially from the base, when the projection of the elastic part covers the pushing part, the locking unit is in the second position; when the projection of the elastic part does not cover the pushing part, the locking unit is in the first position. The elastic part includes a free end extending along the axial direction of the adjusting seat; A first limiting part is provided on one end of the base near the adjusting seat; The free end and the first limiting part constrain the position of the locking unit so that the locking unit is held in the first position; The adjusting seat includes a central shaft portion, and the elastic portion is disposed on the central shaft portion. The end of the elastic portion near the base is a free end.

2. The medical clamping device according to claim 1, characterized in that, The end of the central shaft near the base is connected to the conveying system. The conveying system adjusts the position of the central shaft to change the position of the adjusting seat relative to the base and adjusts the engagement state of the first connecting part and the second connecting part.

3. The medical clamping device according to claim 1, characterized in that, The elastic part includes a first guide part, and the pushing part includes a second guide part; The first guide part and the second guide part cooperate to deform the elastic part by pressing the pushing part, thereby causing the locking unit to move to the second position.

4. The medical clamping device according to claim 1, characterized in that, The first connecting portion includes a plurality of first snap-fit ​​portions extending along the axial direction of the base; The second connecting portion includes a plurality of second snap-fit ​​portions extending along the axial direction of the adjusting seat; At least one of the first latching portions is selectively latched to at least one of the second latching portions, so that the opening and closing angle is adjustable in multiple levels.

5. The medical clamping device according to claim 1, characterized in that, The clamping unit includes at least two lower clamping arms, each of which is pivotally connected to the base and can be adjusted to form different opening and closing angles by the movement of the adjusting seat relative to the base.

6. The medical clamping device according to claim 5, characterized in that, The clamping unit further includes at least two upper clamping arms, each of which is connected to the base and can be driven to move closer to or further away from the lower clamping arm.

7. The medical clamping device according to claim 5, characterized in that, The clamping unit further includes an elastic arm, one end of which is pivotally connected to the lower clamping arm; the other end of which is pivotally connected to the adjusting seat, or the other end of which is fixedly connected to the adjusting seat.

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