Jaw assembly and clamping pliers

Abstract

The present application relates to a jaw assembly and a clip applier, belonging to a medical surgical device. The jaw assembly includes a clamp mechanism, which includes two elastic arms arranged opposite to each other and clamps formed one-to-one on the front ends of the two elastic arms. The two clamps move between an open position and a closed position to clamp a ligation clip located in the clamp mechanism. A symmetry axis is formed between the two clamps. An inner groove is formed on the outer side surface of at least one elastic arm. The inner groove has a supporting wall extending roughly along the direction of the symmetry axis. The jaw assembly also includes a sleeve arranged on the outer side of the elastic arm. The sleeve is partially inserted into the inner groove and abuts against the supporting wall. The sleeve moves along the direction of the symmetry axis to push the supporting wall to move in a direction perpendicular to the symmetry axis, so that the two clamps change between an open position and a closed position. The jaw assembly can stabilize the firing of the clip applier and improve the clamping effect of the ligation clip, and can reduce the firing force.

Description

Technical Field

[0001] The invention relates to a jaw assembly and a clip applier, belonging to medical surgical devices. Background Art

[0002] In order to fully expose the surgical field of view during surgery, it is necessary to ligate the blood vessels around the target tissue to stop bleeding. Hemostasis technology has become one of the core basic surgical operation techniques. Surgical operations on any part of the human body almost without exception involve bleeding and hemostasis. Generally, a clip applier ligature is used to close the hemostasis. When the clip applier in the prior art is used, the closure of the clamp is achieved by squeezing the side of the clamp through the outer sleeve, and the outer sleeve is located at the end of the clamp, which causes the ligature to cross, twist and be shaped when closed. Summary of the invention

[0003] The object of the present invention is to provide a jaw assembly which can stabilize firing, improve clamping effect and reduce firing force.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a jaw assembly, including a clamping mechanism, the clamping mechanism includes two elastic arms arranged opposite to each other and one-to-one clamps formed on the front ends of the two elastic arms, the two clamps move between an open position and a closed position to clamp the ligation clamp located in the clamping mechanism, a symmetry axis is formed between the two clamps, an inner groove is formed inwardly on the outer side surface of at least one of the elastic arms, the inner groove has a supporting wall extending roughly along the direction of the symmetry axis, the jaw assembly also includes a sleeve arranged on the outer side of the elastic arm, the sleeve is partially inserted into the inner groove and abuts against the supporting wall, the sleeve moves along the direction of the symmetry axis to push the abutment wall to move in a direction perpendicular to the symmetry axis, so that the two clamps change between an open position and a closed position.

[0005] Furthermore, each of the inner grooves has two sets of abutting walls that are arranged in parallel or substantially parallel.

[0006] Furthermore, the two groups of abutment walls on each of the inner grooves are arranged in an up-and-down direction in the thickness direction, and each of the inner grooves also includes a connecting wall connecting the two abutment walls, and the two groups of abutment walls and the connecting wall form an inverted step shape, and the sleeve has a hook portion that cooperates with the inner groove.

[0007] Furthermore, the supporting wall is pushed to move in a direction perpendicular to the axis of symmetry to form a first position corresponding to the open position and a second position corresponding to the closed position. When the sleeve moves from the second position to the first position, the two clamps move from the closed position to the open position under the action of the rebound force of the elastic arm.

[0008] Furthermore, the supporting wall includes an oblique extension section that causes the two clamps to move between an open position and a closed position, and the oblique extension section has a first end and a second end that are relatively arranged, and the first end is away from the front end of the clamp mechanism; the oblique extension section gradually deviates outward from the first end toward the second end along the opening direction of the clamp mechanism.

[0009] Furthermore, the supporting wall also includes a stabilizing section extending forward from the second end, and the stabilizing section is parallel to the symmetry axis.

[0010] Furthermore, the clamp mechanism also includes a connecting portion connecting the two elastic arms, and the connecting portion, the elastic arms and the clamp are integrally formed.

[0011] Furthermore, the abutting wall is arranged close to the clamp.

[0012] Furthermore, each of the clamps is provided with an inner groove, and the two inner grooves are symmetrically arranged.

[0013] Furthermore, at least one recess is formed on the inner side wall of at least one of the clamps.

[0014] Furthermore, a clamping groove for clamping the ligation clip is formed inwardly on the inner side wall of the clamp, and the depth of the recess is greater than the depth of the clamping groove.

[0015] The present invention also provides a clamp, comprising a working head, a handle mounted on the working head for holding, and a shaft device assembled on the working head, wherein the shaft device comprises an outer sleeve assembled with the working head, a rod body assembly arranged in the outer sleeve, and the above-mentioned jaw assembly assembled on the rod body assembly.

[0016] Furthermore, an extension arm is provided on one side of the jaw assembly, and the extension arm is arranged on both sides of the jaw assembly opposite to the sleeve, and the extension arm extends to the bottom of the clamp.

[0017] The beneficial effects of the present invention are as follows: the jaw assembly of the present invention forms an inner groove on the outer side of the elastic arm, and the sleeve cooperates with the abutting wall of the inner groove, so that when the sleeve moves along the direction of the symmetry axis, the abutting wall can be pushed to move in a direction perpendicular to the symmetry axis, so that the two clamps can change between the open position and the closed position, so that the firing of the clip applicator can be stable and the clamping effect of the ligation clip can be improved. Since the inner groove that cooperates with the sleeve is formed on the elastic arm, the jaw assembly can achieve local material removal, reduce the stress cross section, and thus reduce the firing force. In addition, by arranging the abutting wall on the elastic arm, the force applied by the sleeve acts on the elastic arm, thereby reducing the concentration of stress on the clamp, and the required firing force is smaller than that of the prior art.

[0018] In addition, by forming a recess on the inner wall of the jaws, the blood vessel can be embedded in the recess when clamping the blood vessel, thereby helping to increase the clamping force.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a jaw assembly and a shaft device according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 An exploded view of the mid-shaft assembly;

[0022] Figure 3 for Figure 1 Enlarged view of the middle circle, with the clamp mechanism in the open position;

[0023] Figure 4 is a schematic diagram of the clamp mechanism in a closed position;

[0024] Figure 5 is a schematic diagram of the structure of the clamping mechanism;

[0025] Figure 6 It is a schematic diagram of the structure of a part of the clamping structure in another direction;

[0026] Figure 7 for Figure 5 A schematic diagram of the partial structure of the middle sleeve;

[0027] Figure 8 A schematic diagram of a working head and a handle of an electric clip applier shown in one embodiment of the present invention;

[0028] Fig. 9 for Figure 8 The structural diagram of the working head;

[0029] Fig.10 for Fig. 9 Schematic cross-sectional view of ;

[0030] Fig.11 is a partial enlarged view of another jaw assembly that can be used in the present invention, with the jaw mechanism in an open position;

[0031] Fig.12 It is a structural schematic diagram of a clamping mechanism in the prior art;

[0032] Fig.13 for Fig.11 Illustration of the jaw assembly in use. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] The clamp is used to fix the ligation clip on the blood vessel to block the blood flow in the blood vessel. The ligation clip is closed (i.e., clamped) by the jaw assembly of the clamp. The clamp can be a manual clamp or an electric clamp. An embodiment of the present invention is described by taking an electric clamp as an example. The electric clamp includes a jaw assembly for setting the ligation clip, and the jaw assembly is used to clamp the ligation clip. Figure 3 and Figure 4 Combined with Figure 1 The jaw assembly 4 shown in one embodiment of the present invention includes a clamp mechanism 41 and a sleeve 42 arranged outside the clamp mechanism 41. The ligation clip 10 is arranged in the clamp mechanism 41, and the clamp mechanism 41 has two positions: an open position ( Figure 3 shown) and closed position ( Figure 4As shown in the figure, the ligation clip 10 in the clamp mechanism 41 can be closed into a clamp by the movement of the clamp mechanism 41 from the open position to the closed position. The ligation clip 10 is a titanium clip. The clamp mechanism 41 is moved from the open position to the closed position by cooperating with the sleeve 42. In the actual clip applicator structure, the clamp mechanism 41 can be assembled on the outer sleeve, the clamping assembly, or the rod assembly, but the clamp mechanism 41 can usually only be opened or closed, and cannot move along the longitudinal direction of the outer sleeve.

[0038] See also Figure 5 The clamp mechanism 41 includes a first elastic arm 413 and a second elastic arm 414 that are arranged opposite to each other, a first clamp 411 formed on the front end of the first elastic arm 413, a second clamp 412 formed on the front end of the second elastic arm 414, and a connecting portion 415 connecting the first elastic arm 413 and the second elastic arm 414. The first clamp 411 and the second clamp 412 can move relative to each other ( Figure 3 The direction indicated by the arrows a1-a2 is the opening direction of the clamp mechanism), and the first clamp 411 and the second clamp 412 move between the open position and the closed position to clamp the ligation clip 10 located in the clamp mechanism 41. A symmetry axis X is formed between the first clamp 411 and the second clamp 412 (the extension direction of the symmetry axis X is the same as the longitudinal direction of the outer sleeve). The first clamp 411 and the second clamp 412 have the same structure and are mirror-imaged. The first clamp 411 is used as an example for detailed description. The first clamp 411 includes a clamping portion 4111 and an extension portion 4112 extending forward from the clamping portion 4111. The end of the clamping portion 4111 away from the extension portion 4112 is named as the end of the first clamp 411 (not numbered), and the end of the extension portion 4112 away from the clamping portion 4111 is named as the front end 4113, and the front end 4113 is the front end 4113 of the clamp mechanism 41. A clamping groove 4114 for clamping the ligation clip 10 is formed in the inner side wall (not numbered) of the clamping portion 4111 . The clamping groove 4114 extends from the end of the clamping portion 4111 to the extension portion 4112 and is close to the front end 4113 of the extension portion 4112 , but does not pass through the front end 4113 of the extension portion 4112 .

[0039] The first clamp 411, the second clamp 412, the first elastic arm 413, the second elastic arm 414 and the connecting portion 415 are an integrated structure, that is, the clamp mechanism 41 is formed in one piece. The first elastic arm 413 and the second elastic arm 414 are arranged roughly in parallel under normal conditions (usually the first elastic arm 413 and the second elastic arm 414 will slightly expand outward), and there is a movable gap between the two. The two can move relative to each other under the action of external force, and after the external force is removed, they move in opposite directions under the action of their elastic forces and return to a relatively parallel state. The first elastic arm 413 and the second elastic arm 414 have the same structure and are arranged in a mirror image. The structure of the first elastic arm 413 is described below by taking the first elastic arm 413 as an example. The first elastic arm 413 is in the shape of a straight strip. The thickness of the first elastic arm 413 is less than the thickness of the first clamp 411 with which it is connected. The first elastic arm 413 has a first connecting portion 4131 disposed near the first clamp 411. Specifically, the first connecting portion 4131 is connected to the first clamp 411. Conventionally, the width of the first connecting portion 4131 gradually widens from the first elastic arm 413 to the first clamp 411 (e.g., Fig.12 ), but, in this embodiment, an inner groove 416 is formed on the outer side surface of the first connecting portion 4131, and the inner groove 416 has a supporting wall 4161 extending substantially along the direction of the symmetry axis X. In addition, a material-cutting design is performed on the connecting portion 415 (i.e., a material-cutting groove 4152 is formed). Specifically, the connecting portion 415 has a flat portion for connecting with the rod body assembly and a second connecting portion 4151 formed on the flat portion. The first elastic arm 413 and the second elastic arm 414 are both connected to the second connecting portion 4151, and a material-cutting groove 4152 is formed between the second connecting portion 4151 and the first elastic arm 413 and the second elastic arm 414.

[0040] See also Figures 3 to 6 , the sleeve 42 moves in the direction of the axis of symmetry X. The sleeve 42 is located on one side of the first elastic arm 413 and the second elastic arm 414 in the thickness direction of the clamping mechanism 41. In the present embodiment, the sleeve 42 is mounted on the rod body assembly, and the sleeve 42 is driven by the rod body assembly to move along the axis of symmetry X. The sleeve 42 is an arc-shaped sheet body. Of course, in other embodiments, the sleeve 42 can also be arranged on the outer sleeve, and the sleeve 42 is driven by the outer sleeve to move in the direction of the axis of symmetry X. The sleeve 42 is partially inserted into the inner groove 416 and abuts against the abutting wall 4161. The sleeve 42 moves in the direction of the axis of symmetry X to push the abutting wall 4161 to move in a direction perpendicular to the axis of symmetry X, causing the first clamp 411 and the second clamp 412 to change between an open position and a closed position. The sleeve 42 pushes the abutting wall 4161 to move in a direction perpendicular to the axis of symmetry X to form a first position corresponding to the open position (see Figure 3 ) and a second position corresponding to the closed position (see Figure 4), when the sleeve 42 moves from the second position to the first position, the two first clamps 411 and the second clamps 412 are moved from the closed position to the open position under the action of the rebound force of the first elastic arm 413 and the second elastic arm 414. Through this arrangement, the first clamp 411 and the second clamp 412 are automatically opened without the need for additional parts.

[0041] In this embodiment, the first elastic arm 413 and the second elastic arm 414 are both formed with inner grooves 416, and the two inner grooves 416 are symmetrically arranged. However, in other embodiments, the inner groove 416 may be formed on only one of the first elastic arm 413 and the second elastic arm 414. When the inner groove 416 is formed on only one of the first elastic arm 413 and the second elastic arm 414, the other is set as a fixed component, such as forming the inner groove 416 on the first elastic arm 413. At this time, the second elastic arm 414 is a fixed component. When the sleeve 42 moves along the direction of the symmetry axis X, due to the cooperation between the sleeve 42 and the abutting wall 4161 of the first elastic arm 413, the sleeve 42 will push the first clamp 411 to move in the direction of the second clamp 412 until the first clamp 411 and the second clamp 412 are closed (that is, the first clamp 411 and the second clamp 412 are in the closed position).

[0042] Each inner groove 416 has two groups of abutment walls 4161 arranged in parallel or approximately in parallel, specifically: the two groups of abutment walls 4161 are respectively named as upper abutment wall 4162 and lower abutment wall 4163. The upper abutment wall 4162 and the lower abutment wall 4163 on each inner groove 416 are arranged in the up and down directions in the thickness direction, wherein the upper abutment wall 4162 is located above the lower abutment wall 4163, and the upper abutment wall 4162 and the lower abutment wall 4163 are staggered. Each inner groove 416 also includes a connecting wall 4164 connecting the upper abutment wall 4162 and the lower abutment wall 4163. The two groups of abutment walls 4161 and the connecting wall 4164 form an inverted step shape. Each inner groove 416 increases the contact area and improves the thrust by setting two abutment walls 4161. In this embodiment, please combine Figure 7 and Figure 6 The sleeve 42 has a hook portion 421 that cooperates with the inner groove 416. The hook portion 421 has two abutment surfaces 422 formed by corresponding upper abutment walls 4162 and lower abutment walls 4163 and a horizontal surface 423 connecting the two abutment surfaces 422. The horizontal surface 423 is located below the connecting wall 4164 to abut against the connecting wall 4164 to prevent the sleeve 42 from separating from the inner groove 416.

[0043] Each abutting wall 4161 includes an oblique extension section 4166 that causes the two clamps to move between the open position and the closed position, and a stabilizing section 4167 that extends vertically or substantially vertically from one end of the oblique extension section 4166. The oblique extension section 4166 has a first end (not numbered) and a second end (not numbered) that are relatively arranged, and the first end is away from the front end of the clamp mechanism; the oblique extension section 4166 gradually deviates outward from the first end toward the second end along the opening direction of the clamp mechanism. The stabilizing section 4167 is formed by extending forward from the second end, and the stabilizing section 4167 is parallel or substantially parallel to the symmetry axis. The stabilizing section 4167 is provided to ensure the clamping effect. In the present embodiment, in order to prevent the inner groove 416 and the sleeve 42 from separating when the two move relative to each other, the oblique extension section 4166 and the abutment surface 422 are V-shaped, wherein the V-shaped opening of the oblique extension section 4166 is arranged outward. Specifically, in the present embodiment, the oblique extension section 4166 includes a first inclined surface 4168 and a second inclined surface 4169, and the angle between the first inclined surface 4168 and the axis X is smaller than the angle between the second inclined surface 4169 and the axis X. In detail, the first inclined surface 4168 is roughly parallel to the axis X, and the second inclined surface 4169 can prevent the sleeve 42 from moving out of the inner groove 416. In the present embodiment, the first inclined surface 4168 and the second inclined surface 4169 are linear surfaces. Of course, in other embodiments, the first inclined surface 4168 and the second inclined surface 4169 can also be curved surfaces.

[0044] Please combine Figure 8 and Figure 1 The electric clamp usually includes a working head 2, a handle 1 mounted on the working head 2 for holding, and a shaft device 3 assembled on the working head 2. The jaw assembly 4 is arranged on the shaft device 3. In this embodiment, the handle 1, the working head 2 and the shaft device 3 are detachably connected, so that any one of them can be directly replaced when damaged, without replacing the surgical instrument as a whole to save medical costs and reduce the economic pressure on patients. The working head 2 and the handle 1, the working head 2 and the shaft device 3 can be detachably connected by means of clamping, threaded fitting, plug-in, etc. In this embodiment, the working head 2 and the handle 1 are connected by clamping, and the working head 2 and the shaft device 3 are connected by plug-in.

[0045] See also Figures 8 to 10 The working head 2 includes a housing 21, a driving rod 23 disposed in the housing 21, a first communication component, and a rotating head 22 mounted on the housing 21. The housing 21 is provided with an opening 211 for connecting the first communication component (not shown) with the outside, the opening 211 is located in the rotating head 22, and a first guide 222 is formed in the rotating head 22.

[0046] The handle 1 is an electric handle 1, which includes a handle housing 13 with a receiving cavity, a motor 14 disposed in the receiving cavity, a control circuit electrically connected to the motor 14, a first switch 11 and a second switch 12 disposed on the handle housing 13 and coupled to the control circuit, and the working head 2 is also provided with a transmission mechanism 25 for converting the radial force of the motor 14 into an axial force, and the driving rod 23 is connected to the transmission mechanism 25. Among them, the first switch 11 is used to drive the driving rod 23 to move forward, and the second switch 12 is used to drive the driving rod 23 to move backward. Of course, the driving component, the control circuit, the first switch 11 and the second switch 12 can also be disposed in the working part, depending on the actual situation, and are not specifically limited here.

[0047] Please combine Figure 1 , Figure 2 and Fig. 9 The rod body device 3 includes a docking portion 32 matched with the working head 2, an outer sleeve 31 fixed on the docking portion 32, a rod body assembly arranged in the docking portion 32 and the outer sleeve 31, and a clamping chamber assembly arranged on the rod body assembly. In this embodiment, the outer sleeve 31 is fixed on the docking portion 32. After the docking portion 32 is fixed on the working head 2, the outer sleeve 31 will not move relative to the working head 2 in the axial direction. A plurality of ligation clips 10 are arranged in the clamping chamber assembly, which are clamped out through the rod body assembly. The docking portion 32 includes a docking shell 321 for inserting into the rotating head 22 and a second communication assembly 322 arranged at the front end of the docking shell 321 to be plugged with the first communication assembly. A second guide member 323 is formed on the docking shell 321 to cooperate with the first guide member 222 to adjust the docking position of the second communication assembly 322 and the first communication assembly. When the shaft device 3 is inserted into the rotating head 22, the first guide member 222 and the second guide member 323 cooperate with each other to make the first communication component dock with the second communication component 322, and the driving rod 23 (see Fig.10 ) is connected to the rod body assembly.

[0048] In this embodiment, the first communication component and the second communication component 322 have the problem of being difficult to dock, wherein the second communication component 322 includes a communication housing 3221 mounted on the docking housing 321 and an electrical terminal 3222 arranged in the communication housing 3221, the communication housing 3221 is formed with a rectangular opening 3225 for exposing the electrical terminal 3222, and the first communication component includes a docking port plugged into the rectangular opening 3225, and the docking port and the rectangular opening 3225 need to be fully aligned when docking. Therefore, the design of the first guide 222 and the second guide 323 is particularly important to achieve a quick, convenient and efficient effect. Specifically, the first guide 222 includes at least two first bosses 2221 arranged at intervals, and the second guide 323 includes at least a second boss 3231 that engages between at least two first bosses 2221, and the first boss 2221 and the second boss 3231 are arrow-shaped structures. When preparing for plugging, the arrows of the first boss 2221 and the second boss 3231 are arranged opposite to each other; after the plugging is completed, the arrows of the first boss 2221 and the second boss 3231 are misaligned and arranged opposite to each other.

[0049] The communication housing 3221 is a cylindrical structure, and an annular protrusion 3224 is protruded from the outer cylindrical surface of the communication housing 3221. The docking housing 321 is provided with a first groove 3211 that matches the protrusion 3224, and the second communication component 322 can rotate relative to the docking housing 321. Correspondingly, the docking housing 321 is also a cylindrical structure, and a second groove 3212 is provided on the docking housing 321. The rotating head 22 is provided with a ball 221 that engages with the second groove 3212. The plug-in process of the shaft device 3 and the rotating head 22 is: rotate the communication housing 3221 to make it rotate relative to the docking housing 321 to adjust the position of the second communication component 322, so that the second communication component 322 corresponds to the position of the first communication component, and the second boss 3231 roughly corresponds to the interval position between the two first bosses 2221. When the shaft device 3 is inserted into the rotating head 22, the position of the shaft device 3 is finely adjusted so that the second boss 3231 is matched with the first boss 2221 until the rectangular opening 3225 is completely connected with the docking port, and the second groove 3212 is engaged with the ball 221. After the shaft device 3 and the rotating head 22 are connected, when the rotating head 22 is rotated to adjust the angle of the shaft device 3, since the second communication component 322 and the first communication component are connected and remain stationary, the docking housing 321 rotates relative to the second communication component 322 to complete the angle adjustment of the shaft device 3.

[0050] The rod assembly includes a closing push cylinder 341 disposed in the docking housing 321, a clamping push cylinder 342 disposed in the closing push cylinder 341, a fixing sleeve 343 sleeved between the closing push cylinder 341 and the docking housing 321, and a closing rod 33 and a clamping rod 35 disposed in the outer sleeve 31. A first spring 361 is disposed in the clamping push cylinder 342, and the clamping push cylinder 342 passes through the communication housing 3221 and abuts against the driving rod in the working head 2, so as to push the clamping push cylinder 342 to move in the clamping direction through the transmission assembly in the working head 2. A first spring 361 is disposed in the clamping push cylinder 342, and an inner step portion (not shown) is disposed in the clamping push cylinder 342. One end of the first spring 361 abuts against the inner step, and the other end abuts against the clamping rod 35. The clamping rod 35 is connected to the clamping push cylinder 342 through the first pin 362. The clamping rod 35 is formed with a long slot 351 extending along the clamping direction, and the first pin 362 passes through the long slot 351. The clamping push cylinder 342 and the closing push cylinder 341 are sleeved with a second spring 353. One end of the second spring 353 abuts against the outer edge of the clamping push cylinder 342, and the other end extends between the closing push cylinder 341 and the fixed sleeve 343 and abuts against the fixed sleeve 343. The closing push cylinder 341 is also sleeved with a third spring 354, one end of the third spring 354 abuts against the fixing plate 355, and the other end abuts against the outer flange 3411 of the closing push cylinder 341. The closing push cylinder 341 is divided into a front sleeve portion 3412 and a rear sleeve portion 3413 by the outer flange 3411. The second spring 353 is sleeved on the rear sleeve portion 3413, and the third spring 354 is sleeved on the front sleeve portion 3412. The fixing plate 355 is fixed to the front end opening of the docking housing 321. The front opening side of the docking housing 321 is provided with a third pin 357, which is located inside the fixing plate 355. The third pin 357 passes through the long slot 351 of the push-clamp rod 35 and the strip slot 331 of the closing rod 33. The third pin 357 cooperates with the long slot 351 and the strip slot 331 to limit the push-clamp rod 35 and the closing rod 33 to retreat (i.e., reset) position. The closing push cylinder 341 is connected to the closing rod 33 through a second pin 356, which also passes through the long slot 351. The second pin 356 is arranged closer to the clamp mechanism 41 than the first pin 362. A fixing groove 3214 for fixing the fixing sleeve 343 is formed in the external housing 321. In this embodiment, the rear end of the sleeve 42 is extended to form an extension plate 44, which is clamped with the closing rod 33. In other embodiments, the sleeve 42 can be directly arranged on the closing rod 33. The connection portion 415 of the clamp mechanism 41 is partially overlapped below the closing rod 33 , and overlapping comb teeth 40 are formed on both the connection portion 415 and the closing rod 33 .

[0051] The clipping chamber assembly includes a clipping chamber box 37, a push clamping plate 38 disposed in the clipping chamber box 37, and a cover plate 39 disposed relative to the clipping chamber box 37. The push clamping plate 38 and the cover plate 39 are disposed relatively to each other at the upper and lower sides of the connecting portion 415 and the closing rod 33, that is, the push clamping plate 38 and the cover plate 39 are surrounded to form a storage space (not shown) for placing the ligation clip 10, the connecting portion 415 and the closing rod 33 are partially located in the storage space, and the ligation clip 10 is disposed near the cover plate 39 relative to the connecting portion 415 and the closing rod 33. A combing portion (not numbered) that matches the combing tooth portion 40 is formed on the clipping chamber box 37. A plurality of back grooves 391 are formed on the cover plate 39, and a barb 381 that matches the back grooves 391 is formed on the push clamping plate 38. A plurality of ligation clips 10 are arranged in the clipping chamber box 37. The push rod 35 and the magazine box 37 are both formed with elongated grooves 352 and 371, and the cover plate 39 is formed with a protruding block 392, which extends into the elongated grooves 352 and 371 and can move along the axial direction in the elongated grooves 352 and 371. The magazine assembly also includes a push rod 30 extending into the lower side of the clamp mechanism to resist the ligation clamp 10 located in the jaw assembly 4.

[0052] See also Figure 2 and Figure 5 , and combined with Figure 3 and Figure 4 In order to stabilize the clamp, an extension arm 311 is extended from the outer sleeve 31, and the extension arm 311 is arranged on one side of the jaw assembly. The extension arm 311 and the sleeve 42 are arranged on both sides of the jaw assembly. Specifically, the extension arm 311 extends to the bottom of the clamping portion 4111 and further extends toward the extension portion 4112. The extension arm 311 and the sleeve 42 are arranged on both sides of the jaw assembly, and the extension arm 311 blocks the hook portion 432. In this embodiment, the extension arm 311 and the outer sleeve 31 are integrally formed. Of course, in other embodiments, the extension arm 311 and the outer sleeve 31 can also be separated, that is, the extension arm 311 is fixed to the outer sleeve 31 by fasteners or welding. In addition, in other embodiments, the extension arm 311 can also be set on other non-moving parts. By extending the extension arm 311 to below the clamping portion 4111 , the suspended portion of the first clamp 411 and the second clamp 412 is reduced, thereby preventing the first clamp 411 and the second clamp from twisting under the action of stress, which helps to stabilize the clamp.

[0053] See also Fig.11 and Fig.13The jaw assembly may also be structured as follows: a recess 47 is formed on the inner side wall of at least one of the first jaw 411 and the second jaw 412. The depth of the recess 47 is greater than the depth of the clamping groove 4114. Of course, in other embodiments, the inner part 47 may be formed only on one of the first jaw 411 or the second jaw 412. Of course, the number of the recess 47 may also be set to multiple according to actual needs. By forming the recess 47 on the inner side wall of at least one of the first jaw 411 and the second jaw 412, the blood vessel 20 can be embedded in the recess 47 when clamping the blood vessel 20, thereby helping to increase the clamping force. It should be noted that the jaw assembly in this embodiment can use a special ligation clamp, which is formed with a curved portion corresponding to the recess 47. Specifically, the ligation clamp includes two clamp arms arranged opposite to each other, and an elastic connection portion connecting the two clamp arms. The clamp arms are raised outward to form a curved portion. When the ligation clamp enters the jaw assembly, the clamp arms are placed in the clamping groove, and the curved portion is placed in the recess 47. When the ligation clamp of this embodiment is clamped, the farthest end of the ligation clamp is first closed to a certain extent by force, and the proximal part of the semi-closed titanium clamp is then closed to prevent the blood vessel from sliding outward horizontally. The number of curved portions of the ligation clamp is set according to the number of matching recesses 47.

[0054] In summary, the above-mentioned jaw assembly forms an inner groove 416 on the outer side of the elastic arm, and the sleeve 42 cooperates with the abutting wall 4161 of the inner groove 416, so that when the sleeve 42 moves along the direction of the symmetry axis X, it can push the abutting wall 4161 to move perpendicular to the direction of the symmetry axis X, so that the two clamps can change between the open position and the closed position, so that the firing of the clamp can be stable and the clamping effect of the ligation clamp can be improved. Since the inner groove 416 that cooperates with the sleeve 42 is formed on the elastic arm, the jaw assembly can achieve local material removal, reduce the stress cross section, and thus reduce the firing force. In this embodiment, the inner groove 416 is arranged close to the clamp, so as to reduce the deviation of the clamp mechanism 41 when clamping, and ensure the clamping effect. In addition, by arranging the abutting wall 4161 on the elastic arm, the force applied by the sleeve 42 acts on the elastic arm, thereby reducing the concentration of stress on the clamp, and the required firing force is smaller than that of the prior art.

[0055] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A jaw assembly, comprising a clamp mechanism, wherein the clamp mechanism comprises two elastic arms arranged opposite to each other and clamps formed one by one on the front ends of the two elastic arms, wherein the two clamps move between an open position and a closed position to clamp a ligation clamp in the clamp mechanism, wherein a symmetry axis is formed between the two clamps, and wherein: An inner groove is formed on the outer side surface of at least one of the elastic arms, and the inner groove has a supporting wall extending in the direction of the symmetry axis. The jaw assembly also includes a sleeve arranged on the outer side of the elastic arm, the sleeve is partially inserted into the inner groove and abuts against the supporting wall, and the sleeve moves in the direction of the symmetry axis to push the supporting wall to move in a direction perpendicular to the symmetry axis, so that the two jaws change between an open position and a closed position; The sleeve pushes the abutting wall to move in a direction perpendicular to the symmetry axis to form a first position corresponding to the open position and a second position corresponding to the closed position. When the sleeve moves from the second position to the first position, the two clamps move from the closed position to the open position under the action of the rebound force of the elastic arm. The clamp mechanism further comprises a connecting portion connecting the two elastic arms, and the connecting portion, the elastic arms and the clamp are integrally formed.

2. The jaw assembly according to claim 1, characterized in that Each of the inner grooves has two sets of abutment walls which are arranged in parallel or substantially parallel.

3. The jaw assembly according to claim 2, characterized in that The two groups of abutment walls on each inner groove are arranged in an up-and-down direction in the thickness direction. Each inner groove also includes a connecting wall connecting the two abutment walls. The two groups of abutment walls and the connecting wall form an inverted step shape. The sleeve has a hook portion that cooperates with the inner groove.

4. The jaw assembly according to claim 1, characterized in that: The supporting wall includes an oblique extension section that causes the two clamps to move between an open position and a closed position, the oblique extension section having a first end and a second end that are relatively arranged, the first end being away from the front end of the clamp mechanism; the oblique extension section gradually deviates outward from the first end toward the second end along the opening direction of the clamp mechanism.

5. The jaw assembly according to claim 4, characterized in that The supporting wall further includes a stabilizing section extending forward from the second end, and the stabilizing section is parallel to the symmetry axis.

6. The jaw assembly according to claim 1, wherein: The abutment wall is disposed adjacent to the clamp.

7. The jaw assembly according to claim 1, wherein: Each of the clamps is provided with an inner groove, and the two inner grooves are symmetrically arranged.

8. The jaw assembly according to any one of claims 1 to 7, characterized in that: At least one recess is formed on the inner side wall of at least one of the clamps.

9. The jaw assembly according to claim 8, characterized in that The inner side wall of the clamp is concavely formed with a clamping groove for clamping the ligation clip, and the depth of the concave portion is greater than the depth of the clamping groove.

10. A clip applier comprising a working head, a handle mounted on the working head for holding, and a shaft device mounted on the working head, characterized in that: The shaft device comprises an outer sleeve assembled with the working head, a shaft assembly disposed in the outer sleeve, and a jaw assembly according to any one of claims 1 to 9 assembled on the shaft assembly.

11. The clip applier according to claim 10, wherein: An extension arm is arranged on one side of the jaw assembly. The extension arm and the sleeve are arranged on both sides of the jaw assembly opposite to each other, and the extension arm extends to the bottom of the clamp.

Images