A reloadable clip applier with reduced recoil

Abstract

The present application belongs to the technical field of medical devices, and particularly relates to a continuous delivery clip applier capable of reducing rebound resistance. The present application aims at the problem that the existing technology cannot use non-elastic body material to manufacture the head body, and provides a continuous delivery clip applier capable of reducing rebound resistance, which comprises a driving handle. An outer sleeve and an inner sleeve are further arranged between the driving handle and the driving rod. The driving handle is drivingly connected with the outer sleeve, the driving rod is fixedly connected with the inner sleeve, the inner sleeve is sleeved in the outer sleeve and is movably arranged opposite to the outer sleeve. Sliding the outer sleeve or the inner sleeve can switch the outer sleeve and the inner sleeve between the elastic connection state and the hard connection state. The connection state between the inner sleeve and the outer sleeve of the present application can be switched between the elastic connection state and the hard connection state, so that the non-elastic body material can also ensure the smooth progress of the entire clip application process.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to a rapid-fire clamp that can reduce rebound resistance. Background Technology

[0002] A repeating clamp is a surgical instrument used to clamp tissue during surgical procedures. Most existing repeating clamp heads are made of elastomeric materials. When the clamp is pushed into the head body by a pusher mechanism, the head body is opened by the clamp's own elasticity to facilitate subsequent clamping steps. However, clamp heads made of elastomeric materials need to be able to be opened by the clamp, so they are generally thin and thin, resulting in low strength, easy damage, and a very short service life. If a non-elastomeric material is used for the head body, opening the clamp requires the synchronous movement of many internal components, thus requiring greater force to open the head body, which is difficult to achieve using the clamp's own elasticity.

[0003] For example, a Chinese invention patent application discloses a repeating clamp [Application No.: CN202111376487.X]. This invention patent application includes a clamp housing, a clamp head push rod connected to the clamp housing with a clamp head at one end, and moving the clamp head push rod can cause the clamp head to open or close. The clamp housing is provided with a clip mounting structure, and a clip assembly for accommodating at least two tissue clips is mounted on the clip mounting structure. The end of the clamp head push rod away from the clamp head is connected to a propulsion structure. A first feed mechanism and a second feed mechanism are provided between a drive handle rotatably connected to the clamp housing and the propulsion structure. The drive handle pushes the propulsion structure into a first feed space through the first feed mechanism, and the drive handle pushes the propulsion structure into a second feed space through the second feed mechanism.

[0004] This invention patent application has the advantage of effectively reducing the amplitude of the automatic opening action of the tissue clip when it is pushed out, but it still does not solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a rapid-fire clamp that can reduce rebound resistance.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions: A rapid-fire clamp with reduced rebound resistance includes an outer shell with an internal mounting cavity, a drive handle rotatably connected to the outer shell, an adjustable clamp head assembly on the outer shell, a drive rod connected to one end of the clamp head assembly, and sliding the drive rod can open or close the clamp head assembly. The end of the drive rod away from the clamp head assembly extends into the mounting cavity and is drivenly connected to the drive handle. An outer sleeve and an inner sleeve are provided between the drive handle and the drive rod. The drive handle is drivenly connected to the outer sleeve, and the drive rod is fixedly connected to the inner sleeve. The inner sleeve is fitted inside the outer sleeve and is movably arranged relative to the outer sleeve. Sliding the outer sleeve or the inner sleeve can switch the outer sleeve and the inner sleeve between an elastic connection state and a rigid connection state.

[0007] In the aforementioned type of rapid-fire clamp that can reduce rebound resistance, a first spring is provided on the outer sleeve, and a limiting flange protruding from the side of the outer sleeve is provided at one end of the outer sleeve. One end of the first spring is pressed on the limiting flange, and the other end is pressed on the outer shell. The first spring is in a compressed state.

[0008] In the aforementioned type of rapid-fire clamp that can reduce rebound resistance, the limiting flanges are connected end to end in a ring shape.

[0009] In the aforementioned type of rapid-fire clamp that can reduce rebound resistance, the inner sleeve includes an integrally formed large cylindrical section and a small cylindrical section. The outer diameter of the large cylindrical section is larger than the outer diameter of the small cylindrical section. The outer surface of the small cylindrical section and the inner surface of the outer sleeve form an elastic connection area. An elastic element is disposed in the elastic connection area to make the outer sleeve and the inner sleeve elastically connected.

[0010] In the above-mentioned rapid-fire clamp that can reduce rebound resistance, the elastic element includes a second spring sleeved on the surface of the small cylinder section and located in the elastic connection area. One end of the second spring is pressed on the outer sleeve, and the other end is pressed on the end face of the large cylinder section. The second spring is in a compressed state.

[0011] In the aforementioned type of rapid-fire clamp that reduces rebound resistance, the stiffness coefficient of the second spring is smaller than that of the first spring.

[0012] In the aforementioned type of repeating clamp that reduces rebound resistance, the axis of the second spring is parallel to or coincides with the axis of the first spring.

[0013] In the aforementioned type of rapid-fire clamp that can reduce rebound resistance, the outer surface of the large barrel section is in contact with the inner surface of the outer sleeve, and the centerlines of the large barrel section, the small barrel section, and the outer sleeve are parallel or coincident to each other.

[0014] In the above-mentioned rapid-fire clamp that can reduce rebound resistance, a limiting step is fixedly connected to the end of the large barrel section away from the small barrel section. The edge of the limiting step protrudes from the side of the large barrel section. The sliding outer sleeve or inner sleeve can press the end of the outer sleeve onto the limiting step to achieve a hard connection.

[0015] In the aforementioned type of repeating clamp that can reduce rebound resistance, one end of the clamp head assembly is rotatably connected to a drive slider, and the drive rod is fixedly connected to the end of the drive slider away from the clamp head assembly.

[0016] Compared with existing technologies, the advantages of this invention are: 1. The connection state between the inner cannula and the outer cannula of the present invention can be switched between an elastic connection state and a rigid connection state. When the clamp assembly needs to be clamped open, the inner cannula and the outer cannula are in an elastic connection state to reduce the rebound resistance. When the clamp assembly is driven to clamp the clamp onto the tissue or blood vessel, the inner cannula and the outer cannula are in a rigid connection state to ensure sufficient clamping force transmission. Thus, even if the clamp assembly is made of a non-elastic material, the entire clamping process can be guaranteed to proceed smoothly.

[0017] 2. The present invention has a simple structure, is easy to use, and is suitable for large-scale promotion and use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal structure of the present invention; Figure 2 This is a structural schematic diagram of a portion of the present invention; Figure 3 This is a cross-sectional view of a portion of the structure of the present invention; Figure 4 This is an exploded view of part of the structure of the present invention; In the diagram: 1. Installation cavity; 2. Outer shell; 3. Drive handle; 4. Pliers head assembly; 5. Drive rod; 6. Outer sleeve; 7. Inner sleeve; 8. Limiting flange; 9. First spring; 10. Drive slider; 71. Large cylindrical section; 72. Small cylindrical section; 73. Elastic connection area; 74. Second spring; 75. Limiting step. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1As shown, a rapid-fire clamp that reduces rebound resistance includes an outer shell 2 with an internal mounting cavity 1, a drive handle 3 rotatably connected to the outer shell 2, and an adjustable clamp head assembly 4 on the outside of the outer shell 2. A drive rod 5 is connected to one end of the clamp head assembly 4, and sliding the drive rod 5 can open or close the clamp head assembly 4. The end of the drive rod 5 away from the clamp head assembly 4 extends into the mounting cavity 1 and is drivenly connected to the drive handle 3. An outer sleeve 6 and an inner sleeve 7 are also provided between the drive handle 3 and the drive rod 5. The drive handle 3 is drivenly connected to the outer sleeve 6, and the drive rod 5 is fixedly connected to the inner sleeve 7. The inner sleeve 7 is sleeved inside the outer sleeve 6 and is movably arranged relative to the outer sleeve 6. Sliding the outer sleeve 6 or the inner sleeve 7 can switch the outer sleeve 6 and the inner sleeve 7 between an elastic connection state and a rigid connection state.

[0021] In use, when the clamp head assembly 4 is in the closed state, the clamp is pushed out into the clamp head assembly 4. The clamp pushing action can be achieved using existing methods, such as an independently driven clamp pushing structure, or synchronously driven by the drive handle 3, where the rotation of the drive handle 3 simultaneously drives the clamp pushing structure to push out the clamp. At this time, the outer sleeve 6 and the inner sleeve 7 are in an elastic connection state to ensure that the clamp experiences minimal resistance during the process of opening the clamp head assembly 4 under elastic force. When clamping tissue or blood vessels is required, the outer sleeve 6 and the inner sleeve 7 are in a rigid connection state to ensure sufficient force to drive the clamping process. Therefore, the connection state between the inner sleeve 7 and the outer sleeve 6 of the present invention can be switched between an elastic connection state and a rigid connection state. When the clamp assembly 4 needs to be clamped open, the inner sleeve 7 and the outer sleeve 6 are in an elastic connection state to reduce the rebound resistance. When the clamp assembly 4 is driven to clamp the clamp onto the tissue or blood vessel, the inner sleeve 7 and the outer sleeve 6 are in a rigid connection state to ensure sufficient clamping force transmission. Thus, even if the clamp assembly 4 is made of a non-elastic material, the entire clamping process can still be guaranteed to proceed smoothly.

[0022] Combination Figure 2-4 As shown, the outer tube 6 is fitted with a first spring 9. One end of the outer tube 6 has a limiting flange 8 protruding from the side of the outer tube 6. One end of the first spring 9 presses against the limiting flange 8, and the other end presses against the outer shell 2. The first spring 9 is in a compressed state. Under the elastic force of the first spring 9, the outer tube 6 can always maintain a forward movement tendency, which is also the initial position of the outer tube 6.

[0023] Preferably, the limiting eaves 8 are connected end to end in a ring shape. This ensures that the end of the first spring 9 is supported at various angles.

[0024] like Figure 3As shown, the inner sleeve 7 includes an integrally formed large cylindrical section 71 and a small cylindrical section 72. The outer diameter of the large cylindrical section 71 is larger than the outer diameter of the small cylindrical section 72. The outer surface of the small cylindrical section 72 and the inner surface of the outer sleeve 6 form an elastic connection area 73. An elastic element is disposed within the elastic connection area 73, thereby elastically connecting the outer sleeve 6 and the inner sleeve 7. The elastic element includes a second spring 74 sleeved on the surface of the small cylindrical section 72 and located within the elastic connection area 73. One end of the second spring 74 presses against the outer sleeve 6, and the other end presses against the end face of the large cylindrical section 71. The second spring 74 is in a compressed state.

[0025] In use, the drive handle 3 drives the outer sleeve 6 to move backward, thereby compressing the second spring 74 and causing the large cylinder section 71 and the small cylinder section 72 to move backward synchronously. The large cylinder section 71 pulls the drive rod 5 to clamp the clamp head assembly 4.

[0026] Preferably, the spring constant of the second spring 74 is less than that of the first spring 9. This ensures that the resistance that the pliers assembly 4 needs to overcome when opening under the force of the clamping spring is relatively small.

[0027] Preferably, the axis of the second spring 74 is parallel to or coincides with the axis of the first spring 9. The outer surface of the large cylindrical section 71 is in contact with the inner surface of the outer sleeve 6, and the axes of the large cylindrical section 71, the small cylindrical section 72, and the outer sleeve 6 are parallel to or coincident with each other. This ensures that the movement of all components remains in the same horizontal direction throughout the entire process, thereby ensuring the stability of the working process.

[0028] Combination Figure 3 and Figure 4 As shown, a limiting step 75 is fixedly connected to the end of the large cylindrical section 71 away from the small cylindrical section 72. The edge of the limiting step 75 protrudes from the side of the large cylindrical section 71. Sliding the outer sleeve 6 or the inner sleeve 7 allows the end of the outer sleeve 6 to be pressed against the limiting step 75 to achieve a rigid connection. When the end of the outer sleeve 6 is pressed against the limiting step 75, the force between the two can be transmitted through the contact between the outer sleeve 6 and the limiting step 75, rather than through the second spring 74. This allows a larger force to be transmitted to the clamp head assembly 4 through the drive rod 5, ensuring sufficient force to clamp the clamp onto the tissue or blood vessel.

[0029] like Figure 1 As shown, one end of the pliers assembly 4 is rotatably connected to a drive slider 10, and the drive rod 5 is fixedly connected to the end of the drive slider 10 away from the pliers assembly 4.

[0030] In use, the clamp assembly 4 is initially open, with both the first spring 9 and the second spring 74 compressed. Rotating the drive handle 3 moves the outer sleeve 6 backward, further compressing the first spring 9. Simultaneously, the outer sleeve 6 applies force to the large cylindrical section 71 by further compressing the second spring 74, causing both the large and small cylindrical sections 71 to move backward. The large cylindrical section 71 then clamps the clamp assembly 4 by pulling the drive rod 5. At this point, the force between the outer sleeve 6 and the inner sleeve 7 is transmitted through the second spring 74, maintaining an elastic connection. When the clamp assembly 4 is closed, the clamps are pushed out into the clamp assembly 4. Under the elastic action of the clamps, the clamp assembly 4 passively opens. During the opening process, the drive rod 5 moves the large and small cylindrical sections 71 and 72 forward. Because the outer sleeve 6 and the inner sleeve 7 are elastically connected, the clamp assembly 4 only needs to overcome the spring force of the compressed second spring 74 during the opening process, i.e., a relatively small resistance. After the clamp assembly 4 opens, further rotation of the drive handle 3 causes the outer sleeve 6 to move backward. During this movement, the end of the outer sleeve 6 presses against the limiting step 75 to achieve a rigid connection. The force between the two is transmitted through the contact between the outer sleeve 6 and the limiting step 75, rather than through the second spring 74. This allows a larger force to be transmitted to the clamp assembly 4 through the drive rod 5, ensuring sufficient force to clamp the tissue or blood vessel. Therefore, the connection state between the inner sleeve 7 and the outer sleeve 6 of this invention can switch between an elastic connection state and a rigid connection state. When the clamp assembly 4 needs to be clamped open, the inner sleeve 7 and the outer sleeve 6 are in an elastic connection state to reduce rebound resistance. When the clamp assembly 4 is driven to clamp the tissue or blood vessel, the inner sleeve 7 and the outer sleeve 6 are in a rigid connection state to ensure sufficient clamping force transmission. Thus, even if the clamp assembly 4 is made of a non-elastic material, the entire clamping process can still be carried out smoothly.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0032] Although this document frequently uses terms such as mounting cavity 1, outer shell 2, drive handle 3, clamp head assembly 4, drive rod 5, outer sleeve 6, inner sleeve 7, limiting flange 8, first spring 9, drive slider 10, large cylindrical section 71, small cylindrical section 72, elastic connection area 73, second spring 74, and limiting step 75, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A rapid-fire clamp with reduced rebound resistance, comprising an outer shell (2) having an internal mounting cavity (1), a drive handle (3) rotatably connected to the outer shell (2), an adjustable clamp head assembly (4) provided outside the outer shell (2), a drive rod (5) connected to one end of the clamp head assembly (4), and sliding the drive rod (5) can open or close the clamp head assembly (4), wherein the end of the drive rod (5) away from the clamp head assembly (4) extends into the mounting cavity (1) and is drivenly connected to the drive handle (3), characterized in that: An outer sleeve (6) and an inner sleeve (7) are provided between the drive handle (3) and the drive rod (5). The drive handle (3) is driven to connect with the outer sleeve (6), and the drive rod (5) is fixedly connected to the inner sleeve (7). The inner sleeve (7) is sleeved inside the outer sleeve (6) and is movably arranged relative to the outer sleeve (6). Sliding the outer sleeve (6) or the inner sleeve (7) can switch the outer sleeve (6) and the inner sleeve (7) between an elastic connection state and a hard connection state.

2. The rapid-fire clamp as described in claim 1, characterized in that: The outer tube (6) is fitted with a first spring (9). One end of the outer tube (6) is provided with a limiting eave (8) protruding from the side of the outer tube (6). One end of the first spring (9) is pressed on the limiting eave (8), and the other end is pressed on the outer shell (2). The first spring (9) is in a compressed state.

3. A rapid-fire clamp with reduced rebound resistance as described in claim 2, characterized in that: The limiting eaves (8) are connected end to end in a ring.

4. A rapid-fire clamp with reduced rebound resistance as described in claim 2, characterized in that: The inner sleeve (7) includes an integrally formed large cylindrical section (71) and a small cylindrical section (72). The outer diameter of the large cylindrical section (71) is larger than the outer diameter of the small cylindrical section (72). The outer surface of the small cylindrical section (72) and the inner surface of the outer sleeve (6) enclose an elastic connection area (73). An elastic element is set in the elastic connection area (73) to make the outer sleeve (6) and the inner sleeve (7) elastically connected.

5. A rapid-fire clamp with reduced rebound resistance as described in claim 4, characterized in that: The elastic element includes a second spring (74) sleeved on the surface of the small cylindrical section (72) and located in the elastic connection area (73). One end of the second spring (74) is pressed on the outer sleeve (6), and the other end is pressed on the end face of the large cylindrical section (71). The second spring (74) is in a compressed state.

6. A rapid-fire clamp with reduced rebound resistance as described in claim 5, characterized in that: The spring constant of the second spring (74) is less than that of the first spring (9).

7. A rapid-fire clamp with reduced rebound resistance as described in claim 5, characterized in that: The axis of the second spring (74) is parallel to or coincides with the axis of the first spring (9).

8. A rapid-fire clamp with reduced rebound resistance as described in claim 4, characterized in that: The outer surface of the large cylindrical section (71) is in contact with the inner surface of the outer sleeve (6), and the center lines of the large cylindrical section (71), the small cylindrical section (72) and the outer sleeve (6) are parallel or coincident to each other.

9. A rapid-fire clamp with reduced rebound resistance as described in claim 4, characterized in that: The end of the large cylindrical section (71) away from the small cylindrical section (72) is fixedly connected to a limiting step (75). The edge of the limiting step (75) protrudes from the side of the large cylindrical section (71). The sliding outer sleeve (6) or inner sleeve (7) can press the end of the outer sleeve (6) onto the limiting step (75) to achieve a hard connection.

10. A rapid-fire clamp with reduced rebound resistance as described in claim 1, characterized in that: One end of the pliers assembly (4) is rotatably connected to a drive slider (10), and the drive rod (5) is fixedly connected to the end of the drive slider (10) away from the pliers assembly (4).

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