Hemostatic clip

Abstract

The application belongs to the technical field of medical devices, and particularly relates to a hemostatic clamp, which comprises a clamp head assembly and a pushing assembly. The clamp head assembly comprises a clamp cylinder with a cylinder cavity and a clamp jaw capable of extending into or being retracted from the cylinder cavity to realize opening or closing. The pushing assembly comprises a connecting shaft separably connected with the clamp cylinder, a pull rod axially arranged in the connecting shaft and separably connected with the clamp jaw, and a separation mechanism movably arranged between the clamp cylinder and the connecting shaft. The separation mechanism comprises a butt joint pipe and a separation piece movably sleeved on the butt joint pipe. The separation piece movably arranged on the butt joint pipe exerts opposite forces on the clamp jaw and the connecting shaft located on both sides of the separation piece during continuous backward movement of the pull rod, so that the pull rod and the clamp jaw are separated, and the clamp cylinder and the connecting shaft are separated to realize release of the clamp head assembly, thereby avoiding displacement phenomenon caused by release of the clamp cylinder before the clamp cylinder assembly in the prior art, and improving operation precision.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a hemostatic clip. Background Technology

[0002] Chinese patent CN119970132A discloses a hemostatic clip, which includes a clamping head component and a pushing component. The clamping head component includes a sleeve and a clamp housed in the sleeve and moving back and forth. The pushing component includes a docking release shaft connected to the clamp and a connecting pipe sleeved outside the docking release shaft. When release is required, the docking release component moves backward, and the clamp moves together with the docking release shaft. During the backward movement, the clamp gradually retracts to clamp the part to be clamped. During the backward movement of the docking release component, the connecting pipe moves backward together. The connecting pipe disengages from the sleeve through the inlet and outlet. Then, the docking release component moves backward again, and the docking release shaft disengages from the clamp through a connecting mechanism, thereby causing the pushing component to disengage from the clamping head component as a whole.

[0003] In this process, the sleeve is first connected to the pushing component through the connecting pipe. The connecting pipe is movably sleeved outside the docking release shaft, which causes the sleeve position to be unstable. This makes it impossible for the chuck assembly to accurately reach the clamping position and thus fail to clamp accurately. Furthermore, the pushing component separates from the sleeve first, and then the clamp separates from the docking release shaft. The sleeve separating first may cause displacement during the process, resulting in reduced operational accuracy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is as follows: In the prior art, the sleeve is connected to the pushing component through the connecting pipe, and the connecting pipe is movably sleeved outside the docking release shaft, which causes the sleeve position to be unstable, making it impossible for the clamping assembly to accurately reach the clamping part and thus unable to clamp accurately. Furthermore, the pushing component separates from the sleeve first, and then the clamp separates from the docking release shaft. The sleeve separating first may cause displacement during the process, resulting in reduced operating accuracy. Therefore, a hemostatic clamp is provided.

[0005] The technical solution adopted by this invention to solve its technical problem is: a hemostatic clip, comprising: A chuck assembly comprising a chuck having a cavity and a clamp that can extend or retract into the cavity to open or close; The pushing component includes a connecting shaft that is detachably connected to the clamp, a pull rod that passes through the connecting shaft axially and is detachably connected to the clamp, and a separation mechanism that is movably disposed between the clamp and the connecting shaft. The separation mechanism includes a connecting tube and a separation element that is movably sleeved on the connecting tube. As the pull rod moves the clamp backward, the clamp gradually closes and remains closed. Then the pull rod continues to move backward, and the separator between the clamp and the connecting shaft is forced to separate from the pull rod as the pull rod moves backward. At the same time, the connecting shaft is forced to retract to release the clamp from the cylinder.

[0006] Furthermore, the clamping cylinder wall is provided with at least two stop arms in the direction of clamping, and there is a stop between the at least two stop arms that can expand under the action of external force to allow the clamp to pass through and reset after the external force is released to limit the forward movement of the clamp.

[0007] Furthermore, the clamp is provided with at least one limiting arm for abutting against the stop arm to limit the forward movement of the clamp.

[0008] Furthermore, the separating element includes at least a top cap for pushing the stop arm during the rearward movement of the pull rod to expand the stop for the clamp to pass through.

[0009] Furthermore, the front end of the connecting shaft is formed with a plurality of docking claws spaced apart along its circumference. The plurality of docking claws can clamp the clamping cylinder and move closer together under the force of the separating member to release the clamping of the clamping cylinder.

[0010] Furthermore, the separating component also includes a cap disposed at the rear end of the top cap, the inner peripheral wall of the cap having a clamping surface that is smaller at the front and larger at the back to clamp the docking claw.

[0011] Furthermore, the top cap has a pressing surface that is larger in the front and smaller in the back to press against the stop arm.

[0012] Furthermore, the front end of the pull rod is formed with at least two clamping arms that can move closer to or further away from each other, and the clamp is formed with a clamping groove for the clamping arms to engage to clamp or release the clamping arms.

[0013] Furthermore, the clamp is an integral structure, which includes two clamping pieces that can move closer to or further away from each other, and a connecting part formed by bending from the rear end of the clamping pieces in a direction away from each other and used to connect the two clamping pieces.

[0014] Furthermore, the connecting shaft also includes a connecting sleeve sleeved outside the docking claw and a limiting ring that protrudes radially to limit the rearward movement of the connecting sleeve, and the docking claw is recessed to form a limiting step for limiting the forward movement of the connecting sleeve.

[0015] The beneficial effects of the present invention are as follows: The present invention utilizes the separating member movably set on the connecting tube to apply opposite forces to the clamps and connecting shafts located on both sides of it during the continuous backward movement of the pull rod, so that the pull rod separates from the clamps and the clamps separates from the connecting shaft at the same time, thereby releasing the clamp assembly. This avoids the displacement phenomenon caused by the clamps releasing before the clamp assembly in the prior art, and improves the operating accuracy.

[0016] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is the front view of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a schematic diagram of the structure when the clamps are opened in this invention; Figure 4 This is a schematic diagram of the gradually closing clamp structure of the present invention; Figure 5 This is a schematic diagram of the structure of the present invention, in which the top cap opens the stop arm to allow the clamping connection part to pass through; Figure 6 yes Figure 5 A magnified view of part A in the middle; Figure 7 This is a schematic diagram of the structure of the cap and the docking claw of the present invention; Figure 8 This is a schematic diagram of the structure of the clamp assembly and the push assembly after separation. Figure 9 This is an exploded view of the present invention; In the picture: 1. Clamp; 101. Cylinder cavity; 102. Stop arm; 103. Stop; 104. Stopping wing; 2. Clamp; 201. Limiting arm; 202. Clamping groove; 203. Clamping plate; 204. Connecting part; 3. Connecting shaft; 301. Docking jaws; 302. Connecting sleeve; 303. Limiting ring; 304. Limiting step; 4. Pull rod; 401. Clamping arm; 5. Takeover; 6. Top cap; 601. Pressing surface; 7. Cap; 701. Clamping surface; 8. Bourdon tube; 9. Cable. Detailed Implementation

[0019] The invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams illustrating only the basic structure of the invention. Therefore, they only show the components relevant to the invention; orientations and references (e.g., up, down, left, right, etc.) and are intended solely to aid in the description of the features in the drawings. Thus, the following specific embodiments are not intended to be limiting, and the scope of the claimed subject matter is defined only by the appended claims and their equivalents.

[0020] like Figure 1-9 As shown, a hemostatic clip includes: The chuck assembly includes a chuck 1 having a cylindrical cavity 101 and a clamp 2 that can extend or retract into the cylindrical cavity 101 to open or close. The chuck 1 is a hollow cylindrical shape, and the front end of the chuck 1 is provided with a blocking wing 104 for limiting the maximum displacement of the clamp 2 extending forward (away from the operator). The number of blocking wings 104 can be, but is not limited to, one or two. When the clamp 2 extends forward into the cylindrical cavity 101, it is in an open state. When the clamp 2 retracts into the cylindrical cavity 101, it closes under the pressure of the cavity wall of the cylindrical cavity 101. The pushing assembly includes a connecting shaft 3 detachably connected to the clamp 1, a pull rod 4 axially passing through the connecting shaft 3 and detachably connected to the clamp 2, a separation mechanism movably disposed between the clamp 1 and the connecting shaft 3, a pull cable 9 connected to the pull rod 4, and a spring tube 8 connected to the connecting shaft 3. The connecting shaft 3 is a hollow cylindrical shape and is located at the rear end of the clamp 1 (near the operator). The connecting shaft 3 is configured to be detached from the clamp 1 under external force, and the pull rod 4 is also configured to be detached from the clamp 2 under external force. At this time, the clamp assembly can remain inside the human body. The separation mechanism includes a connecting pipe 5 and a separation component movably sleeved on the connecting pipe 5; First, the hemostatic clamp is pushed to the clamping site via the endoscope. Then, the lever 4 pushes the clamp 2 forward, and the clamp 2 extends out of the cylinder 101 in an open state. After the target lesion tissue or wound is contained in clamp 2, the lever 4 pulls clamp 2 backward. Clamp 2 is gradually drawn into the cylinder 101 and gradually closes under the pressure of the cylinder 101 wall to clamp the tissue and maintain the clamped state. Finally, the pull rod 4 continues to apply pressure and pull force to the clamp 2. As the pull rod 4 gradually moves backward, it forces the pull rod 4 to separate from the clamp 2. At the same time, it forces the connecting shaft 3 to retract to release the clamping of the clamp 1. At this time, the clamp assembly separates from the push assembly, and the clamp assembly remains in the human body.

[0021] In this embodiment, the separating member movably set on the connecting tube 5 applies opposite forces to the clamps 2 and connecting shaft 3 located on both sides of the pull rod 4 as the pull rod 4 continues to move backward. This causes the pull rod 4 to separate from the clamps 2, and the clamp 1 to separate from the connecting shaft 3, thereby releasing the clamp assembly. This avoids the displacement phenomenon caused by the clamp 1 releasing before the clamp 1 assembly in the prior art.

[0022] In some examples, the wall of the clamp 1 is provided with at least two stop arms 102 in the direction of the clamp 2. A stop 103 is left between the at least two stop arms 102, which can expand under the action of external force to allow the clamp 2 to pass through and reset after the external force is released to limit the forward movement of the clamp 2. The stop arms 102 are stamped and have stamped holes at their locations. Each stop arm 102 includes an axial extension section connected to the wall and extending axially, and a radial extension section that bends inward from the tail of the axial extension section (here, "radial" is an approximate direction, not an absolute radial, and can be slightly inclined). The above-mentioned stop 103 is left between the ends of the multiple radial extension sections that are close to each other. The ends of the axial extension sections are fixed to the wall, and deformation grooves are left between the two sides and the walls of the stamped holes to allow the stop arms 102 to undergo elastic deformation. When the pull rod 4 moves the clamp 2 backward to the position of the stop arm 102, the clamp 2 applies pressure to the stop arm 102 to deform it. At this time, the stop 103 expands to allow the rear end of the clamp 2 to pass through.

[0023] In some examples, the clamp 2 is provided with at least one limiting arm 201 for abutting against the stop arm 102 to limit the forward movement of the clamp 2. The limiting arm 201 is stamped and has a stamped hole at its location. One end of the limiting arm 201 is fixed to the clamp 2, and the other end is bent outward. Deformation grooves that allow the limiting arm 201 to elastically deform are formed between the two sides of the limiting arm 201 and the wall of the stamped hole. The limiting arm 201 is located at the rear end of the clamp 2. When the clamp 2 drives the limiting arm 201 on it to pass through the stop 103, the limiting arm 201 abuts against the stop arm 102 to limit the forward movement of the clamp 2. Preferably, the number of limiting arms 201 and stop arms 102 corresponds, and each stop arm 102 abuts against its corresponding limiting arm 201.

[0024] In some examples, the separating element includes at least a cap 6 for pushing the stop arm 102 during the retraction of the pull rod 4 to expand the stop 103 for the clamp 2 to pass through. The cap 6 is slidably fitted onto the coupling tube 5 and is confined between the clamp 2 and the connecting shaft 3. In the initial state, see [reference needed]. Figure 3 The top cap 6 is located at the front end of the stop arm 102, see [reference]. Figure 4 When the lever 4 moves the clamp 2 backward until the clamp 2 abuts against the connecting tube 5, it moves the connecting tube 5 backward in sync. When the top cap 6 moves between the clamp 2 and the stop arm 102, the continuously moving clamp 2 applies pressure to the top cap 6. The top cap 6 is pressed and pushes the stop arm 102. The stop arm 102 opens up, causing the stop 103 to expand, so that the top cap 6 and the limiting arm 201 can pass through.

[0025] In some examples, the front end of the connecting shaft 3 is formed with a plurality of docking claws 301 spaced apart along its circumference. The plurality of docking claws 301 can clamp the clamping cylinder 1 and move closer together under the force of the separating member to release the clamping of the clamping cylinder 1. A deformation groove is left between two adjacent docking claws 301 to allow the docking claws 301 to deform. In the initial state, the docking claws 301 are located inside the clamping cylinder 1 and clamp the clamping cylinder 1 in place. When the plurality of docking claws 301 are forced to move closer together, the clamping cylinder 1 and the connecting shaft 3 can be separated.

[0026] In some examples, the separating element also includes a cap 7 disposed at the rear end of the top cap 6. The inner peripheral wall of the cap 7 is formed with a clamping surface 701 that is smaller at the front and larger at the back to clamp the docking claws 301, and the outer peripheral wall of the docking claws 301 is formed with a clamping surface that is smaller at the front and larger at the back to cooperate with the clamping surface 701. The cap 7 is slidably sleeved outside the docking tube 5 and is always confined between the stop arm 102 and the connecting shaft 3. When the pull rod 4 drives the clamp 2 to move backward to clamp the top cap 6 and the cap 7 between itself and the connecting shaft 3, the clamp 2 applies pressure to the cap 7 through the top cap 6, causing the cap 7 to move towards the connecting shaft 3, and the cooperation between the conical clamping surface 701 and the conical clamping surface presses several docking claws 301 together. At this time, the clamp 1 and the connecting shaft 3 can be separated.

[0027] In some examples, the top cap 6 has a pressing surface 601 that is larger at the front and smaller at the back to push the stop arm 102. The tapered pressing surface 601 makes it easier to open the stop arm 102. The pressing surface 601 is located at the rear end of the top cap 6, and the front end of the top cap 6 is shaped to match the clamp 2.

[0028] In some examples, the front end of the pull rod 4 is formed with at least two clamping arms 401 that can move closer to or further away from each other, and the clamping arms 401 can restrict the connecting tube 5 and its top cap 6 from moving forward out of the pull rod 4. The clamp 2 is formed with a clamping groove 202 for the clamping arms 401 to engage to clamp or release the clamping arms 401. A deformation groove is formed between at least two clamping arms 401 to allow them to elastically deform. Each clamping arm 401 includes a guide arc surface at the front end for guiding the clamping arm 401 into the clamping groove 202 and an abutting surface at the rear end for abutting against the clamp 2 to confine the clamping arm 401 within the clamping groove 202.

[0029] In some examples, the clamp 2 is an integral structure, which includes two clamping pieces 203 that can be close to or far from each other, and a connecting portion 204 that bends from the rear end of the clamping pieces 203 in a direction away from each other and is used to connect the two clamping pieces 203. The end of the clamping piece 203 away from the connecting portion 204 is the clamping end, which has clamping teeth for clamping tissue. The connecting portion 204 is in an enlarged state, which has a larger contact area with the top cap 6 to more efficiently transmit the pulling force applied by the pull rod 4 to the top cap 6. The clamping groove 202 is located on the connecting portion 204.

[0030] In some examples, the connecting shaft 3 further includes a connecting sleeve 302 sleeved outside the docking claw 301 and a limiting ring 303 that protrudes radially to limit the rearward movement of the connecting sleeve 302. The docking claw 301 is recessed to form a limiting step 304 for limiting the forward movement of the connecting sleeve 302. The limiting step 304 and the limiting ring 303 clamp the connecting sleeve 302. The connecting sleeve 302 has a ring structure. When the connecting shaft 3 is fixed to the clamping cylinder 1, the connecting sleeve 302 is located between the docking claw 301 and the wall of the clamping cylinder 1, leaving a gap between the docking claw 301 and the wall of the clamping cylinder 1. When the cap 7 gradually moves backward and is forced into the gap by the clamp 2, the docking claw 301 can be gradually retracted to release the clamping cylinder 1.

[0031] Working principle: First, the hemostatic clamp is pushed to the clamping site under endoscopy. Then, the lever 4 pushes the clamp 2 forward. The clamp 2 extends out of the cylinder 101 and is in an open state. At this time, the top cap 6 is located at the front end of the stop arm 102 and the cover cap 7 is located at the rear end of the stop arm 102. Then, the lever 4 pulls the clamp 2 backward, and the clamp 2 gradually retracts into the cylinder cavity 101 and gradually closes under the pressure of the cylinder cavity 101 wall to clamp the tissue. When the lever 4 drives the clamp 2 to move backward until the clamp 2 abuts against the connecting tube 5, it drives the connecting tube 5 to move backward synchronously. When the clamp 2 moves backward and abuts against the top cap 6, it can drive the top cap 6 to move backward synchronously. When the top cap 6 moves between the clamp 2 and the stop arm 102, the continuously moving clamp 2 applies pressure to the top cap 6. The top cap 6 is pressed and opens the stop arm 102 through the pushing surface 601. The stop arm 102 deforms and the stop 103 expands to allow the top cap 6 and the limiting arm 201 to pass through. After the limiting arm 201 passes through, the stop arm 102 returns to its original position and abuts against the limiting arm 201 to restrict the clamp 2 from moving forward. At this time, the clamp 2 is confined within the cylinder cavity 101. Next, the pull rod 4 continues to apply pressure and pulling force to the clamp 2. Under continuous action, the clamp arm 401 disengages from the clamp groove 202, realizing the separation of the pull rod 4 and the clamp 2. At the same time, the top cap 6 and the cover cap 7 clamped between the connecting part 204 and the connecting shaft 3 are pressed, causing the cover cap 7 to move towards the connecting shaft 3. Through the cooperation of the conical clamping surface 701 and the conical clamping surface, several mating claws 301 are pressed together, realizing the separation of the clamp cylinder 1 and the connecting shaft 3. At this time, the clamp assembly and the pushing assembly separate, and the clamp assembly remains in the human body.

[0032] The above description, based on the preferred embodiments of the present invention, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A hemostatic clip, characterized in that: include: The clamp assembly includes a clamping cylinder (1) having a cylindrical cavity (101) and a clamp (2) that can extend or retract into the cylindrical cavity (101) to open or close. The wall of the clamping cylinder (1) is provided with at least two stop arms (102) in the direction of the clamp (2). A stop (103) is provided between the at least two stop arms (102) to expand under the action of external force to allow the clamp (2) to pass through and to reset after the external force is released to limit the forward movement of the clamp (2). The pushing assembly includes a connecting shaft (3) detachably connected to the clamp (1), a pull rod (4) axially passing through the connecting shaft (3) and detachably connected to the clamp (2), and a separation mechanism movably disposed between the clamp (1) and the connecting shaft (3). The separation mechanism includes a connecting tube (5) and a separation member movably sleeved on the connecting tube (5). The separation member includes at least a top cap (6) for pushing the stop arm (102) during the backward movement of the pull rod (4) to expand the stop (103) for the clamp (2) to pass through, and a cap (7) disposed at the rear end of the top cap (6). The front end of the connecting shaft (3) is formed with a plurality of docking claws (301) spaced apart along its circumference. The plurality of docking claws (301) can clamp the clamp (1) and move closer together under the force of the separation member to release the clamp (1). The inner circumferential wall of the cap (7) is formed with a clamping surface (701) that is smaller at the front and larger at the back to clamp the docking claws (301). When the pull rod (4) moves the clamp (2) backward, the clamp (2) gradually closes and remains in the closed state. Then the pull rod (4) continues to move backward. The separator between the clamp (2) and the connecting shaft (3) applies opposite forces to the clamp (2) and the connecting shaft (3) on both sides of the pull rod (4) as the pull rod (4) moves backward, forcing the pull rod (4) to separate from the clamp (2) and at the same time forcing the connecting shaft (3) to retract to release the clamp (1).

2. The hemostatic clip according to claim 1, characterized in that: The clamp (2) is provided with at least one limiting arm (201) for abutting against the stop arm (102) to limit the forward movement of the clamp (2).

3. A hemostatic clip according to claim 1, characterized in that: The top cap (6) has a pressing surface (601) that is larger in the front and smaller in the back to press against the stop arm (102).

4. A hemostatic clip according to claim 1, characterized in that: The front end of the pull rod (4) has at least two clamping arms (401) that can move closer to or further away from each other, and the clamp (2) has a clamping groove (202) for the clamping arms (401) to be engaged to clamp or release the clamping arms (401).

5. A hemostatic clip according to claim 1, characterized in that: The clamp (2) is an integral structure, which includes two clamping pieces (203) that can be close to or far from each other, and a connecting part (204) formed by bending from the rear end of the clamping pieces (203) in a direction away from each other and used to connect the two clamping pieces (203).

6. A hemostatic clip according to claim 1, characterized in that: The connecting shaft (3) also includes a connecting sleeve (302) sleeved outside the docking claw (301) and a limiting ring (303) that protrudes radially to limit the rearward movement of the connecting sleeve (302). The docking claw (301) is recessed to form a limiting step (304) for limiting the forward movement of the connecting sleeve (302).

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