A clip applier with adjustable clamping force

Abstract

This invention discloses a clamping force adjustable clamp, comprising a fixed handle and a rotating handle, which are hinged together and a limiting mechanism is provided between them. A first spring plate is provided on the inner side of the fixed handle, with its lower end fixed to the fixed handle. A second spring plate is provided on one side of the first spring plate, with its lower end fixed to the inner side of the rotating handle. The upper end of the first spring plate is connected to the upper end of the second spring plate. A first recessed area is provided on the inner wall of the upper part of the fixed handle, and first connecting plates extending towards the rotating handle are provided on both sides of the first recessed area. A second connecting plate connected to the rotating handle is provided between the two first connecting plates. The clamp also includes a rotating shaft that passes through the first and second connecting plates.

Description

Technical Field

[0001] This invention belongs to the field of medical clamps. Background Technology

[0002] Existing ligation clips are used for ligating blood vessels during human surgical procedures. For example, a ligation clip in application publication number CN103356264B includes two elastic arms, one end of which is fixed together to form a roughly V-shaped structure. A locking mechanism is provided between the other ends of the two elastic arms. In use, the two elastic arms are positioned on either side of the blood vessel, and after the two arms are squeezed together and locked, the blood vessel is ligated.

[0003] Because ligation clips are relatively small, and the operating space at the surgical site is also limited, it is obviously impossible to ligate blood vessels by hand using ligation clips. Currently, ligation clips are generally first fixed to the clamp head of the clamping forceps, the forceps handle is slightly closed to allow the clamp head to hold the ligation clip, and the ligation clip is then delivered to the corresponding blood vessel position while remaining open and positioned. Finally, the forceps handle is forcefully closed, causing the two elastic arms of the ligation clip to squeeze and lock together.

[0004] Existing clamps, such as the clamp with adjustable clamp angle disclosed in CN113349871B, include a fixed handle, a rotating handle hinged to one side of the fixed handle, an outer sleeve at the upper end of the fixed handle, and a push rod movably connected to the upper end of the rotating handle, passing through the outer sleeve. An angle adjustment mechanism is provided on the outer sleeve, and a clamp is located at the front end of the push rod. When the fixed handle and the rotating handle are closed, the rotating handle drives the clamp to close via the push rod. The existing clamping forceps have solved the problem that the clamp angle of traditional clamping forceps cannot be adjusted according to actual needs, which is not conducive to practical use. After being put into production and use, they have been welcomed by the market. However, feedback shows that the following problems still exist: Because the elastic force generated when the two elastic arms of the ligation clamp squeeze each other is always relatively small, the feedback to doctors is weak. Some newly practicing doctors lack experience and do not know how much force to close the handle to fix the ligation clamp without causing it to jam. Their hands are also not steady and they cannot maintain the proper opening of the handle. In addition, it is difficult to clearly see the status of the ligation clamp throughout the process of inserting the ligation clamp into the human body. Sometimes they can only rely on feeling to clamp the ligation clamp, which can easily cause the ligation clamp to close completely due to excessive compression. After reaching the blood vessel, the ligation clamp cannot open again and cannot be inserted into the blood vessel, thus failing to complete the ligation of the blood vessel. The operation is quite difficult.

[0005] Therefore, existing clamping pliers have the drawback of being difficult to operate. Summary of the Invention

[0006] The purpose of this invention is to provide a clamping force adjustable in clamping force. This invention has the advantage of being easy to operate.

[0007] The technical solution of the present invention: a clamping force adjustable clamping clamp, comprising a fixed handle and a rotating handle, the fixed handle and the rotating handle being hinged together, and a limiting mechanism being provided between the fixed handle and the rotating handle.

[0008] In the aforementioned clamping force adjustable clamp, a first spring plate is provided on the inner side of the fixed handle, the lower end of the first spring plate is fixed to the fixed handle, a second spring plate is provided on one side of the first spring plate, the lower end of the second spring plate is fixed to the inner side of the rotating handle, and the upper end of the first spring plate is connected to the upper end of the second spring plate.

[0009] In the aforementioned clamping force adjustable clamp, a first recessed area is provided on the inner side wall of the upper part of the fixed handle, and a first connecting plate extending toward the rotating handle is provided on both sides of the first recessed area, and a second connecting plate connected to the rotating handle is provided between the two first connecting plates; it also includes a rotating shaft that passes through the first connecting plate and the second connecting plate.

[0010] In the aforementioned clamping force adjustable clamp, the limiting mechanism includes a locking core shaft located below the rotating shaft. The locking core shaft passes through the fixed handle and is slidably connected to the fixed handle. One side of the locking core shaft is located in the first recessed area, and one side of the locking core shaft is provided with a concave stepped surface. When the fixed handle and the rotating handle are closed, the second connecting plate abuts against one side of the locking core shaft.

[0011] In the aforementioned clamping force adjustable clamp, the rotating handle is provided with a through hole, and the second connecting plate is located inside the through hole.

[0012] In the aforementioned clamping force adjustable clamp, the lock cylinder shaft is rotatably connected to the fixed handle, and the limiting mechanism includes a second recessed area. The second recessed area is located on the outer peripheral surface of the lock cylinder shaft facing the second connecting plate. The second recessed area is located between the two first connecting plates. The bottom surface of the second recessed area is in the shape of an Archimedean spiral. A stop block fixed to the second connecting plate is provided in the second recessed area. When the fixed handle and the rotating handle are closed, the second connecting plate abuts against the bottom surface of the second recessed area through the stop block.

[0013] In the aforementioned clamping force adjustable clamp, the wrap angle of the second recessed area is less than 180°.

[0014] In the aforementioned clamping force adjustable clamp, the two ends of the rotating shaft are respectively fixed to two first connecting plates, and the second connecting plate is provided with a through hole through which the rotating shaft passes; the limiting mechanism includes a recess located on the inner wall of the through hole, and the outer peripheral surface of the rotating shaft is provided with a retractable ball.

[0015] Compared with existing technologies, this invention adds a limiting mechanism between the fixed handle and the rotating handle to the existing clamping forceps. When the clamp handle is closed, the limiting mechanism prevents it from closing completely, allowing the clamp head to remain at a fixed opening. At this point, the clamp head can hold the ligation clip without causing it to jam, greatly reducing the difficulty of operation for the doctor. The doctor can smoothly deliver the ligation clip to the ligation position of the blood vessel, and then, through the limiting mechanism, the clamp handle and clamp head are fully closed, locking the ligation clip in place to complete the ligation of the blood vessel. Therefore, this invention has the advantage of low operational difficulty. Attached Figure Description

[0016] Figure 1 This is a front view of Example 1.

[0017] Figure 2 This is a front view of the fixed handle in Embodiment 1.

[0018] Figure 3 This is a right view of the fixed handle in Embodiment 1.

[0019] Figure 4 A top view of the lock cylinder shaft in Example 1.

[0020] Figure 5 This is a rear view of the lock cylinder shaft.

[0021] Figure 6 Front view of the rotating handle in Example 1.

[0022] Figure 7 This is a left view of the rotating handle in Embodiment 1.

[0023] Figure 8 This is a front view of the second connecting plate in Embodiment 1.

[0024] Figure 9 This is a cross-sectional view of the lock cylinder shaft in Example 2.

[0025] Figure 10 yes Figure 9 A diagram at point AA.

[0026] Figure 11 This is a front view of Example 3.

[0027] Figure 12 This is a top view of the rotating shaft in Embodiment 3.

[0028] The labels in the attached diagram are as follows: 1-Fixed handle, 2-Rotating handle, 3-First spring plate, 4-Second spring plate, 5-First recessed area, 6-First connecting plate, 7-Second connecting plate, 8-Lock cylinder shaft, 9-Stepped surface, 10-Through hole, 11-Second recessed area, 12-Pit, 13-Sphere, 14-Rotating shaft, 15-First riser, 16-First screw, 17-Cavity, 18-Stop, 19-Blind hole, 20-Spring, 21-Baffle. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0030] Example 1. A clamping force adjustable clamp, such as... Figure 1 As shown, this is an improvement on the adjustable clamp with adjustable chuck published in CN113349871B. It includes a clamp handle consisting of a fixed handle 1 and a rotating handle 2, which are hinged together. The improvements are as follows:

[0031] The inner side of the fixed handle 1 is provided with a first spring plate 3, the lower end of which is fixed to the fixed handle 1. A second spring plate 4 is provided on one side of the first spring plate 3, the lower end of which is fixed to the inner side of the rotating handle 2. The upper end of the first spring plate 3 is connected to the upper end of the second spring plate 4. The first spring plate 3 and the second spring plate 4 are commonly found in most pliers. The upper end of the first spring plate 3 has a slot. When the fixed handle 1 and the rotating handle 2 are closed, the upper end of the second spring plate 4 is inserted into the slot, and the upper end of the second spring plate 4 and the upper end of the first spring plate 3 are elastically connected together, allowing the pliers to open automatically after the force is lost.

[0032] like Figure 2 and Figure 3 As shown, a first recessed area 5 is provided on the inner side wall of the upper part of the fixed handle 1. A first connecting plate 6 extending towards the rotating handle 2 is provided on both sides of the first recessed area 5. The extended end of the first connecting plate 6 is semi-circular. A second connecting plate 7 connected to the rotating handle 2 is provided between the two first connecting plates 6.

[0033] It also includes a rotating shaft 14, which passes through a first connecting plate 6 and a second connecting plate 7. The rotating shaft 14 is formed on a screw, which passes through one of the first connecting plates 6 and the second connecting plate 7 and is then screwed to the other first connecting plate 6. The optical axis of the screw is the rotating shaft 14.

[0034] like Figure 4 and Figure 5As shown, a limiting mechanism is provided between the fixed handle 1 and the rotating handle 2 to limit the angle between them. The limiting mechanism includes a locking cylinder 8 located below the rotating shaft 14. The locking cylinder 8 passes through the fixed handle 1, and its length is greater than the thickness of the fixed handle 1. The outer circumferential surface of the locking cylinder 8 consists of two cylindrical surfaces and two flat surfaces. The locking cylinder 8 is slidably connected to the fixed handle 1, and it does not rotate around its own axis when sliding left and right on the fixed handle 1. One side of the locking cylinder 8 is located within the first recessed area 5, and a stepped surface 9 is provided on one side. When the fixed handle 1 and the rotating handle 2 are closed, the second connecting plate 7 abuts against one side of the locking cylinder 8. One end of the locking cylinder 8 has a first cap 15, and the other end has a first screw 16. After unscrewing the first screw 16 from the locking cylinder 8, the locking cylinder 8 can be moved axially and removed.

[0035] like Figure 6 and Figure 7 As shown, the rotating handle 2 is provided with a through hole 10, the second connecting plate 7 is located in the through hole 10, and both sides of the through hole 10 are provided with recesses 17 that cooperate with the corresponding first connecting plate 6.

[0036] Working principle of Example 1: In the initial state, such as Figure 4 As shown, pushing the lock cylinder shaft 8 upwards corresponds to... Figure 1 In the first step, push the locking cylinder 8 to the right, grasp the clamp handle, and rotate the handle 2 around the rotating shaft 14 towards the fixed handle 1. The second connecting plate 7 abuts against the outer circumferential surface of the locking cylinder 8. At this time, the clamp is not yet fully closed, and the clamping force of the clamp is relatively small. The clamp can hold the ligation clip, but it cannot completely close. The doctor can confidently grip the handle without worrying that excessive force will cause the clamp to close completely, thus preventing the ligation clip from closing. This is because with greater gripping force, the second connecting plate 7 cannot move forward due to the obstruction of the locking cylinder 8, preventing the rotating handle 2 from continuing to rotate. After the doctor places the ligation clip at the blood vessel using the clamp, push the locking cylinder 8 downward. At this time, the stepped surface 9 corresponds to the second connecting plate 7, and a gap is formed between the second connecting plate 7 and the stepped surface 9, allowing the rotating handle 2 to continue rotating at a certain angle. The clamp can then completely close, and the clamping force of the clamp is greater, thus closing the ligation clip on the clamp and completing the ligation of the blood vessel.

[0037] Example 2. (As shown) Figure 9 and Figure 10As shown, unlike Embodiment 1, the lock cylinder shaft 8 is rotatably connected to the fixed handle 1. The lock cylinder shaft 8 is a cylindrical shaft, and its length is equal to the thickness of the fixed handle 1. The limiting mechanism includes a second recessed area 11, which is located on the outer circumferential surface of the lock cylinder shaft 8 facing the second connecting plate 7. The second recessed area 11 is located between the two first connecting plates 6. The bottom surface of the second recessed area 11 is shaped like an Archimedean spiral, such that the depth of one end of the second recessed area 11 is greater than the depth of the other end, and the bottom surface of the second recessed area 11 is a smooth surface. A stop 18 fixed to the second connecting plate 7 is provided in the second recessed area 11. When the fixed handle 1 and the rotating handle 2 are closed, the second connecting plate 7 abuts against the bottom surface of the second recessed area 11 through the stop 18. The wrap angle of the second recessed area 11 is 140°.

[0038] Working principle of Example 2: as follows Figure 10 As shown, rotating the locking cylinder 8 causes the stop 18 to approach the upper end of the second recessed area 11 when the handle is closed. At this point, the clamp is not yet fully closed; the clamp can hold the ligation clip, but it cannot completely close. The doctor can confidently grip the handle without worrying about excessive force causing the clamp to close completely and thus the ligation clip to shut. After the doctor places the ligation clip on the blood vessel using the clamping forceps, rotating the locking cylinder 8 causes the lower end of the second recessed area 11 to approach the stop 18. Since the lower end of the second recessed area 11 is deeper than the upper end, rotating the handle 2 can continue to rotate a certain angle, allowing the clamp to close completely. The ligation clip on the clamp is then closed, and the blood vessel is ligated.

[0039] Example 3. (As shown) Figure 11 and Figure 12 As shown, unlike Embodiment 1, the lock cylinder shaft 8 is omitted. The two ends of the rotating shaft 14 are respectively fixed to two first connecting plates 6. The second connecting plate 7 is provided with a through hole through which the rotating shaft 14 passes. The limiting mechanism includes a recess 12 located on the inner wall of the through hole. A blind hole 19 is provided on the outer peripheral surface of the rotating shaft 14. A ball 13 is provided in the blind hole 19. A spring 20 is provided between the ball 13 and the bottom surface of the blind hole 19. A baffle 21 is provided between the spring 20 and the ball 13.

[0040] Working principle of Example 3: In the initial state, the clamp handle is open, and the recess 12 is on the upper side of the ball 13. After the clamp handle is closed, the second connecting plate 7 rotates with the rotating handle 2. When the recess 12 is at the same height as the ball 13, a small part of the ball 13 enters the recess 12 under the elastic force of the spring 20. At this time, the clamp can clamp the ligation clip, but cannot completely close it. After the doctor places the ligation clip at the blood vessel through the clamp, he continues to close the handle until the clamp is fully clamped, the ligation clip is closed, and the blood vessel is ligated. During the process of the clamp handle being fully opened to fully closed, the feedback force given to the doctor has a leap stage. The leap point is when the ball 13 enters the recess 12 and the clamp handle is to be closed again. The doctor can keep the opening of the clamp constant within a large range of force, so that the clamp clamps the ligation clip without completely closing it. The baffle 21 reduces the contact area between the spring and the ball 13. During the opening and closing of the clamp handle, the ball 13 can rotate, reducing the frictional resistance during opening and closing, making the clamp handle open and close more smoothly and improving the performance.

[0041] Comparison of Examples 1, 2, and 3:

[0042] In Example 1, the locking cylinder 8 is set up to achieve the limiting by moving the locking cylinder 8 left and right. During use, the clamp can be operated with one hand. That is, while the clamp is being held, the locking cylinder 8 can be moved with the index finger or thumb, freeing up one hand for other operations, making it more convenient to use. However, when the locking cylinder 8 is moved so that the second connecting plate 7 abuts against the step surface 9, the reaction force on the second connecting plate 7 suddenly disappears. Under the clamping force of the handle, some shaking may occur. The lateral force acting on the locking cylinder 8 will also aggravate the shaking amplitude to a certain extent, which may cause secondary trauma to other wounds or fragile organs near blood vessels. When the doctor's practice is not proficient enough, it is more suitable for use when there are no other wounds or fragile organs around the blood vessels.

[0043] In Example 2, the locking cylinder 8 is set up to achieve the limiting by rotating the locking cylinder 8. Since the second recessed area 11 is a continuous surface, the clamp is not subjected to lateral force when the locking cylinder 8 is rotated, and it is not easy to produce vibration, which makes it more widely applicable. However, since the first cap 15 at the end of the locking cylinder 8 cannot be made very large, it is difficult to turn it with the fingers on the handle of the clamp. The other hand is needed when rotating the locking cylinder 8, which may be slightly inconvenient to use.

[0044] The structures of Examples 1 and 2 are simple and reliable. When adjusting the clamping force of the ligation clip, they do not rely on elastic elements, thus avoiding the elastic decay problem that may occur after long-term use of elastic elements and resulting in a longer service life.

[0045] In Example 3, the limiting mechanism is set on the rotating shaft 14, eliminating the lock cylinder shaft 8. The structure is more compact, and there are no parts that need to be adjusted during use. The clamp can be operated with one hand, making it more convenient to use. Since there are no parts that need to be adjusted during use, there is no lateral force interference, and it is not easy to shake (but not as well as in Example 2). The range of applications is also wider.

Claims

1. A clamping force adjustable clamp, comprising a fixed handle (1) and a rotating handle (2), wherein the fixed handle (1) and the rotating handle (2) are hinged, characterized in that: A limiting mechanism is provided between the fixed handle (1) and the rotating handle (2), which is used to limit the angle between the fixed handle (1) and the rotating handle (2); The upper inner wall of the fixed handle (1) is provided with a first recessed area (5), and both sides of the first recessed area (5) are provided with a first connecting plate (6) extending toward the rotating handle (2), and a second connecting plate (7) connected to the rotating handle (2) is provided between the two first connecting plates (6); it also includes a rotating shaft (14), which passes through the first connecting plate (6) and the second connecting plate (7). The limiting mechanism includes a lock core shaft (8) located below the rotating shaft (14), the lock core shaft (8) passes through the fixed handle (1), the length of the lock core shaft (8) is greater than the thickness of the fixed handle (1), the lock core shaft (8) is slidably connected to the fixed handle (1), one side of the lock core shaft (8) is located in the first recessed area (5), and one side of the lock core shaft (8) is provided with a concave stepped surface (9). When the fixed handle (1) and the rotating handle (2) are closed, the second connecting plate (7) abuts against the side of the lock core shaft (8) with the stepped surface (9). In the initial state, the second connecting plate (7) abuts against the outer circumferential surface of the lock cylinder shaft (8). At this time, the chuck is not yet fully closed, pushing the lock cylinder shaft (8) to move, so that the concave surface of the step surface (9) corresponds to the second connecting plate (7). A gap is formed between the second connecting plate (7) and the concave surface of the step surface (9), so that the rotating handle (2) can continue to rotate at a certain angle, and the chuck can be fully closed.

2. The clamping force adjustable clamping clamp according to claim 1, characterized in that: The inner side of the fixed handle (1) is provided with a first spring plate (3), the lower end of the first spring plate (3) is fixed to the fixed handle (1), and a second spring plate (4) is provided on one side of the first spring plate (3). The lower end of the second spring plate (4) is fixed to the inner side of the rotating handle (2), and the upper end of the first spring plate (3) is connected to the upper end of the second spring plate (4).

3. The clamping force adjustable clamping clamp according to claim 1, characterized in that: The rotating handle (2) is provided with a through hole (10), and the second connecting plate (7) is located inside the through hole (10).

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