Tong head assembly and clip applier

Abstract

The utility model relates to a forceps head assembly and a clip applier, and belongs to the technical field of medical tools, the forceps head assembly comprises a first forceps head and a second forceps head which are connected through a pin shaft, the inner side of a forceps arm of the first forceps head is provided with a first groove for containing a ligature clip, and the second forceps head is provided with a second groove for containing a ligature clip. A first circular groove for containing the ligation clamp supporting lug is further formed in the side wall of the end of the first groove. Correspondingly, a second groove and a second circular groove are formed in the tong arm, facing the first tong head, of the second tong head. A plug is arranged at the root part of the clamp arm of the first clamp head, a slot is formed in the root part of the clamp arm of the second clamp head, and the plug can be inserted into the slot for closing and limiting. Due to the fact that the closing limiting structure is additionally arranged between the two forceps heads, it is guaranteed that the forceps heads do not deflect when closed, and it is guaranteed that the ligature clamp is closed accurately.

Description

Technical Field

[0001] This utility model relates to the field of medical tool technology, and in particular to a forceps head assembly and a clamping forceps. Background Technology

[0002] Ligation clips are used for ligating blood vessels or other tubular structures in clinical laparoscopic surgery or surgical non-absorbable ligation nail clamps. Ligation clips are used to seal tubular structures within the body during surgical procedures and require the assistance of clamping forceps. Clamping forceps are typically made of materials such as stainless steel. This product has two relatively movable rods, and the clamping force is controlled by a handle and movable gripper, facilitating the surgeon's operation. The end of the clamping forceps is the clamp head, which grips vascular closure clips or closed vascular closure clips, requiring a stable gripping and clamping effect.

[0003] Patent CN112190301A discloses a multi-size combination clamp with graduations and a ligation clip surgical kit containing the clamp. The clamp includes a clamp head, a push rod, and a handle. The clamp head has graduations for measuring blood vessel width. It also includes a clamp head size adjustment switch, which includes an adjustment post and a switch button. The adjustment post is located at the rear end of the top of the movable handle and its two ends pass through the fixed handle. A size adjustment panel is provided on the surface of the adjustment post opposite the movable handle. The ligation clip surgical kit consists of a ligation clip set containing at least two sizes and one clamp.

[0004] Utility model patent CN211355690U discloses a ligation clamp, including a clamp head, a handle, a rotating wheel base, and a clamp bar. The rotating wheel base is connected to the handle; the clamp bar is connected to the rotating wheel base; the clamp head includes two clamping plates assembled together; the clamping plates are integrally formed; from left to right, the clamping plates are a clamping part, an assembly part, and a connecting part; the clamping part is provided with a positioning groove and positioning teeth for clamping items; one end of the positioning groove is open; the positioning teeth are located on both sides of the positioning groove; the clamping part and the assembly part form an angle α; the connecting part is provided with a clamp bar connecting hole for connecting the clamp bar and a push rod limiting hole for connecting the push rod; both clamping plates are connected to the clamp bar pin through the clamp bar connecting hole.

[0005] The invention patent with announcement number CN111904527A discloses a clamping forceps, including a clamp head, a ligation clip, and a handle assembly. The ligation clip is installed inside the clamp head, and the handle assembly is connected to the clamp head to drive the clamp head to open and close. The clamp head includes an upper clamp head and a lower clamp head, which form a jaw for installing the ligation clip, and the upper and lower clamp heads form a clamping connection with the ligation clip. The jaw is also provided with a ligation clip auxiliary spring mechanism. The ligation clip auxiliary spring mechanism is an arc-shaped spring plate vertically installed inside the jaw, and the natural opening and closing angle of the upper and lower ends of the spring plate is not greater than the maximum natural opening and closing angle of the ligation clip.

[0006] However, in all the above-mentioned patented technical solutions, the two clamp heads are only connected by a pin. Since the upper and lower clamp heads are moving parts, there is an inevitable gap in the fit. Moreover, the clamp heads extend a long way, which makes them prone to tilting when the clamps are closed. Sometimes this can cause the ligation clamp to fail to close properly, especially when the gap between the clamp heads increases after long-term use of the clamps.

[0007] Therefore, it is necessary to develop a clamping head assembly and clamping pliers to address the aforementioned shortcomings. Utility Model Content

[0008] The purpose of this invention is to provide a clamping head assembly and clamping clamp, which ensures that the clamping head does not deviate when closing by adding a closing limiting structure between the two clamping heads, thus ensuring accurate closure of the ligation clamp.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0010] This utility model comprises a clamp head assembly, including a first clamp head and a second clamp head connected by a pin. The inner side of the clamp arm of the first clamp head is provided with a groove for accommodating a ligation clip, and the end side wall of the groove is also provided with a circular groove for accommodating the ligation clip lug. Correspondingly, the clamp arm of the second clamp head facing the first clamp head is also provided with a second groove and a second circular groove. A plug is provided at the root of the clamp arm of the first clamp head, and a slot is provided at the root of the clamp arm of the second clamp head. The plug can be inserted into the slot for closure and positioning.

[0011] Furthermore, the width fit gap between the plug and the slot is less than 0.1 mm.

[0012] Furthermore, both the plug and the slot have rectangular cross-sections, and the top of the plug narrows towards the middle with rounded edges.

[0013] Furthermore, with the first and second pliers open, the top of the plug enters the slot.

[0014] Furthermore, a convex pad is provided at the bottom of the circular groove one at the corresponding position, and the convex pad abuts against the rear sidewall of the ligation clip; a convex pad two is also provided on the second clamp head accordingly.

[0015] Furthermore, a limiting plate is provided on one side of the step of the docking platform of the first clamp head, the height of the limiting plate protruding from the docking platform and able to abut against the step surface of the second clamp head; correspondingly, a limiting plate is also provided on the second clamp head.

[0016] This utility model also discloses a clamping pliers, including a clamping pliers body, the head of the clamping pliers body is equipped with the clamping head assembly described in any of the above claims, the outer sleeve end of the clamping pliers body is connected by a pin to the pin hole at the tail of the first clamping head and the second clamping head using a pin shaft; the top rod end of the clamping pliers body is provided with a drive pin, the drive pin is slidably connected in the drive pin groove at the tail of the first clamping head and the second clamping head.

[0017] Furthermore, the tail rod is coaxially connected to the tail end of the top rod of the clamp body, and a limit ring groove is provided in the rear section of the tail rod. A limit protrusion that cooperates with the limit ring groove is installed at the top of the handle of the clamp body.

[0018] Furthermore, the limiting ring groove is an arc groove, and the top of the limiting protrusion is set as a ball head.

[0019] Furthermore, the top of the snap-fit ​​lug at the top of the movable handle of the clamp body is set as a convex round head, and the tail rod is set as a snap-fit ​​groove at the position corresponding to the snap-fit ​​lug, with a rounded corner at the root of the snap-fit ​​groove.

[0020] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0021] This practical clamp assembly, by setting a closing limiting structure between the first and second clamp heads, ensures that the two clamp heads, which have a movable gap, do not misalign when the ligation clamp is closed, allowing the clamp's snap-fit ​​structure to smoothly engage. The plug and slot, respectively located on the inner side of the clamp arm root, provide limiting at a position close to the pin, thereby ensuring alignment at the distal end.

[0022] Furthermore, by setting a small mating gap in the width direction of the plug and slot, the sway margin of the first and second clamp heads can be limited, avoiding alignment failures. By setting the plug and slot with rectangular cross-sections, a larger guiding contact area can be obtained, thus achieving more stable positioning. Increasing the length of the plug prevents jamming when closing the clamp heads. Setting the slot as a blind hole prevents external tissue debris or oblique pieces from entering the slot during surgical procedures, making cleaning difficult. By adding two convex pads at the bottom of the groove, the convex pads can abut against the rear wall of the ligation clip when closing force is applied, avoiding the problem of deformation of the outer ear that can easily occur when relying solely on the circular groove and groove to push against the outer ear of the ligation clip. The setting of limiting plates one and two limits the degree of closure of the two clamp heads, preventing excessive compression of the ligation clip.

[0023] This utility model of clamping forceps, by adding a limiting ring groove and a limiting protrusion, allows doctors to clearly feel the applied force through a click when manipulating the forceps, resulting in superior control. By setting the top of the limiting protrusion as a ball head and the limiting ring groove as an arc groove, jamming is prevented during the axial movement of the push rod. By setting the top of the locking lug as a convex round head, the jaws can be forcibly reset and opened when the forceps head is obstructed. The convex round head reduces damage to the sidewall of the locking groove and facilitates return. By setting a rounded corner at the root of the locking groove, the connection strength at the root of the locking groove is ensured, and it will not break even if forcibly reset. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a three-dimensional structural diagram of the pliers head assembly of this utility model;

[0026] Figure 2 This is a three-dimensional structural diagram of the first clamp head in this utility model;

[0027] Figure 3 This is a three-dimensional structural diagram of the second clamp head in this utility model;

[0028] Figure 4 This is a three-dimensional structural diagram of the clamping pliers of this utility model;

[0029] Figure 5 This is a schematic diagram of the cross-sectional structure of the clamping device of this utility model;

[0030] Figure 6 for Figure 5 A partially enlarged structural diagram of the middle clamp head section;

[0031] Figure 7 for Figure 5 A magnified schematic diagram of the structure of part I in the middle.

[0032] Explanation of reference numerals in the attached drawings: 1. First clamp head; 101. Groove 1; 102. Circular groove 1; 103. Convex pad 1; 104. Plug; 105. Limiting plate 1; 2. Second clamp head; 201. Groove 2; 202. Circular groove 2; 203. Convex pad 2; 204. Slot; 205. Limiting plate 2; 3. Pin hole; 4. Drive pin groove; 5. Clamping clamp body; 501. Tail rod; 5011. Limiting ring groove; 5012. Rounded corner; 502. Limiting protrusion; 503. Convex round head. Detailed Implementation

[0033] The core of this utility model is to provide a clamp head assembly, which ensures that the clamp head does not deviate when closing by adding a closing limiting structure between the two clamp heads, thus ensuring accurate closure of the ligation clamp.

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Refer to the attached diagram. Figure 1 This is a three-dimensional structural diagram of the pliers head assembly of this utility model; Figure 2 This is a three-dimensional structural diagram of the first clamp head in this utility model; Figure 3 This is a three-dimensional structural diagram of the second clamp head in this utility model;

[0037] Figure 4 This is a three-dimensional structural diagram of the clamping pliers of this utility model; Figure 5 This is a schematic diagram of the cross-sectional structure of the clamping device of this utility model; Figure 6 for Figure 5 A partially enlarged structural diagram of the middle clamp head section; Figure 7 for Figure 5 A magnified schematic diagram of the structure of part I in the middle.

[0038] Example 1

[0039] like Figures 1-3As shown, similar to existing clamping pliers, the clamping head assembly of this utility model also includes a first clamping head 1 and a second clamping head 2 connected by a pin. The inner side of the clamp arm of the first clamping head 1 has a groove 101 for accommodating a ligation clip, and the end side wall of the groove 101 also has a circular groove 102 for accommodating a ligation clip lug. Correspondingly, the clamp arm of the second clamping head 2 facing the first clamping head 1 also has a groove 201 and a circular groove 202. The groove 101 and the groove 201 are arranged face-to-face. The difference from existing clamping pliers is that the clamping head assembly of this application has a closing limiting structure between the first clamping head 1 and the second clamping head 2: a plug 104 is provided at the root of the clamp arm of the first clamping head 1, and a slot 204 is provided at the root of the clamp arm of the second clamping head 2. The plug 104 can be inserted into the slot 204 to limit the clamping head closure.

[0040] By setting a closing limiting structure between the first clamp head 1 and the second clamp head 2, the two clamp heads with movable gaps can be prevented from misaligning when the ligation clip is closed, so that the snap-fit ​​structure of the ligation clip can be smoothly connected. By setting the plug 104 and the slot 204 on the inner side of the root of the clamp arm, the limiting can be performed at a position close to the pin shaft, thereby ensuring the alignment of the distal end.

[0041] In one specific implementation of this embodiment, such as Figures 1-3 As shown, the width fit clearance between the plug 104 and the slot 204 is less than 0.1 mm. The plug 104 and the slot 204 can have a larger fit clearance along the extension direction of the pliers arm, as long as it does not affect the opening and closing of the pliers head.

[0042] By setting a small mating gap in the width direction between the plug 104 and the slot 204, the sway margin of the first clamp head 1 and the second clamp head 2 can be limited, thus avoiding alignment failure.

[0043] Specifically, such as Figure 2 and Figure 3 As shown, both the plug 104 and the slot 204 have rectangular cross-sections. The top of the plug 104 narrows towards the middle and the edges are rounded.

[0044] Obviously, the cross-sections of the plug 104 and the slot 204 can also be cylindrical and oblong holes, and similar simple replacement methods all fall within the protection scope of this utility model.

[0045] Specifically, such as Figures 1-3 As shown, with the first pliers 1 and the second pliers 2 open, the top of the plug 104 enters the slot 204, thus increasing the length of the plug 104. This ensures that the plug 104 remains within the slot 204 during the opening and closing of the pliers, preventing misalignment. Furthermore, the slot 204 is a blind hole.

[0046] By setting the plug 104 and slot 204, both of which have rectangular cross-sections, a larger guiding contact area can be obtained, thereby achieving a more stable limit. By increasing the length of the plug 104, jamming when closing the forceps head is avoided. By setting the slot 204 as a blind hole, it is prevented that peripheral tissue debris or oblique pieces from entering the slot 204 during surgical operations, which would make cleaning inconvenient.

[0047] In one specific implementation of this embodiment, such as Figures 1-3 As shown, a raised pad 103 is provided at the bottom of the circular groove 102 corresponding to the groove 101. The top edge of the raised pad 103 is level with the bottom surface of the circular groove 102, and the raised pad 103 abuts against the rear sidewall of the ligation clip. A raised pad 203 is also provided on the corresponding second clamp head 2.

[0048] By adding convex pad 103 and convex pad 203 at the bottom of the groove, the convex pad can close and abut against the rear side wall of the ligation clip when the closing force is applied, thus avoiding the problem of deformation of the outer support ear when the outer support ear of the ligation clip is pushed up by the circular groove 102 and the groove 201 alone.

[0049] Because ligation clips are generally made of plastic, if the operator applies excessive force to the movable handle during the closure process, the two clamp heads may excessively compress the ligation clip, potentially damaging it. In one specific embodiment of this example, as... Figures 1-3 As shown, a limiting plate 105 is provided on one side of the step of the docking platform of the first clamp head 1. The height of the limiting plate 105 protrudes from the docking platform and can abut against the step surface of the second clamp head 2. Correspondingly, a limiting plate 205 is also provided on the second clamp head 2.

[0050] By setting the limiting plate 105 and the limiting plate 205, the degree of closure of the two clamp heads can be limited, avoiding excessive compression of the ligation clip.

[0051] In summary, the clamp head assembly of this utility model, by setting a closing limiting structure between the first clamp head 1 and the second clamp head 2, ensures that the two clamp heads with movable gaps do not misalign when the ligation clip is closed, allowing the snap-fit ​​structure of the ligation clip to smoothly engage. By setting the plug 104 and slot 204 on the inner side of the root of the clamp arm, limiting the clamping position close to the pin shaft, thus ensuring alignment at the distal end. Furthermore, by setting a small mating gap in the width direction of the plug 104 and slot 204, the sway margin of the first clamp head 1 and the second clamp head 2 can be limited, avoiding alignment failure. By setting the plug 104 and slot 204, both with rectangular cross-sections, a larger guiding contact area can be obtained, thus achieving more stable limiting; by increasing the length of the plug 104, jamming when closing the clamp heads is avoided; by setting the slot 204 as a blind hole, it is prevented that peripheral tissue debris or oblique pieces from entering the slot 204 during surgical procedures, thus avoiding inconvenience in cleaning. By adding convex pad 103 and convex pad 203 at the bottom of the groove, the convex pads can abut against the rear side wall of the ligation clip when a closing force is applied, thus avoiding the problem of deformation of the outer ear that is easily caused when the outer ear of the ligation clip is pushed up by the circular groove 102 and the groove 201 alone. The setting of the limiting plate 105 and the limiting plate 205 can limit the degree of closure of the two clamp heads, avoiding excessive compression of the ligation clip.

[0052] Example 2

[0053] This utility model also discloses a clamping pliers, such as Figures 4-6 As shown, the clamping pliers of this utility model include a clamping pliers body 5. The clamping head assembly of Embodiment 1 is installed on the head of the clamping pliers body 5. The end lug of the outer sleeve of the clamping pliers body 5 is connected by a pin to the pin hole 3 at the tail of the first clamping head 1 and the second clamping head 2. The structure of other parts of the clamping pliers body 5 is generally the same as that of clamping pliers in the prior art, and will not be described in detail here. The pin hole 3 is opened in the middle of the mating platform. Drive pins are provided on both sides of the top rod end of the clamping pliers body 5. The drive pins are cylindrical pins and are slidably connected in the drive pin grooves 4 at the tail of the first clamping head 1 and the second clamping head 2. The two drive pin grooves 4 are arranged crosswise, and the drive pin slides at the intersection.

[0054] In one specific implementation of this embodiment, such as Figure 4 and Figure 5 As shown, a tail rod 501 is coaxially connected to the tail end of the top rod. A limiting ring groove 5011 is provided at the rear section of the tail rod 501. A limiting protrusion 502 that mates with the limiting ring groove 5011 is installed at the top of the handle of the clamping body 5. When the limiting protrusion 502 is engaged in the limiting ring groove 5011, the clamping head assembly is in the closed position.

[0055] By adding a limiting ring groove 5011 and a limiting protrusion 502, doctors can clearly feel the force applied when operating the clamping forceps through a clicking sensation, resulting in better controllability.

[0056] Specifically, such as Figure 4 and Figure 5 As shown, the limiting ring groove 5011 is an arc groove, and the top of the limiting protrusion 502 is set as a ball head. The ball head is inserted into the arc groove. The limiting protrusion 502 is supported by a compression spring in the mounting groove, allowing it to extend and retract.

[0057] By setting the top of the limiting protrusion 502 as a ball head and the limiting ring groove 5011 as an arc groove, jamming can be prevented during the axial movement of the push rod.

[0058] Specifically, such as Figure 5 and Figure 7 As shown, the top of the snap-fit ​​lug at the top of the movable handle of the clamp body 5 is set as a convex round head 503, and the tail rod 501 is set as a snap-fit ​​groove at the position corresponding to the snap-fit ​​lug, and the root of the snap-fit ​​groove is provided with a rounded corner 5012.

[0059] By setting the top of the snap-fit ​​lug as a convex round head 503, when the jaws are blocked and cannot be opened, the jaws can be forcibly reset and opened. The convex round head 503 position reduces damage to the side wall of the snap-fit ​​groove and facilitates return. By setting a rounded corner 5012 at the root of the snap-fit ​​groove, the connection strength at the root of the snap-fit ​​groove is ensured, and it will not break even if it is forcibly reset.

[0060] The procedure for using this utility model of clamps is as follows: Different models of clamps are selected for treatment based on the patient's condition. Disinfection is performed before surgery, and the disinfection time and temperature should comply with the instrument's instruction manual. The movable handle is pressed to check the clamp's function, which should also meet the requirements of the instrument's instruction manual.

[0061] After determining the surgical location, the surgeon uses clamping forceps to retrieve a single ligation clip from the clip box. Using instruments such as a trocar, the clip is positioned at the treatment site. The surgeon presses the handle, pushing the push rod forward. The drive pin moves the intersection point of the drive pin groove 4 forward, causing the first clamp head 1 and the second clamp head 2 to close. When a clicking sound is heard as the limiting protrusion 502 enters the limiting ring groove 5011, the ligation clip has clamped the blood vessel. The handle is then released, and the clamping forceps are withdrawn. It is important to note that as the first clamp head 1 and the second clamp head 2 close, the plug 104 gradually depresses into the slot 204, preventing clamp head misalignment.

[0062] After the operation is completed, clean and disinfect promptly, and store properly for future use.

[0063] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0064] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A clamp head assembly, comprising a first clamp head (1) and a second clamp head (2) connected by a pin, wherein the inner side of the clamp arm of the first clamp head (1) is provided with a groove (101) for accommodating a ligation clip, and a circular groove (102) for accommodating the lug of the ligation clip is also provided on the end side wall of the groove (101); correspondingly, the clamp arm of the second clamp head (2) facing the first clamp head (1) is also provided with a groove (201) and a circular groove (202); characterized in that, The first pliers (1) has a plug (104) at the base of its pliers arm, and the second pliers (2) has a slot (204) at the base of its pliers arm. The plug (104) can be inserted into the slot (204) for closing and limiting.

2. The jaw assembly of claim 1, wherein, The width fit gap between the plug (104) and the slot (204) is less than 0.1 mm.

3. The jaw assembly of claim 1, wherein, Both the plug (104) and the slot (204) have rectangular cross-sections, and the top of the plug (104) narrows towards the middle and the edges are rounded.

4. The jaw assembly of claim 3, wherein, With the first clamp (1) and the second clamp (2) open, the top of the plug (104) enters the slot (204).

5. The forceps head assembly of claim 1, wherein, The groove one (101) is provided with a convex pad one (103) at the bottom of the circular groove one (102), and the convex pad one (103) abuts against the rear side wall of the ligation clip; the corresponding second clamp head (2) is also provided with a convex pad two (203).

6. The forceps head assembly of claim 1, wherein, A limiting plate (105) is provided on one side of the docking platform of the first clamp head (1). The height of the limiting plate (105) protrudes from the docking platform and can abut against the step surface of the second clamp head (2). A limiting plate (205) is also provided on the second clamp head (2).

7. A clip applier, comprising: The clamp body (5) includes a clamping pliers body (5) with a clamping head assembly as described in any one of claims 1 to 6 mounted on its head. The end of the outer sleeve of the clamping pliers body (5) is connected by a pin to the pin hole (3) at the tail of the first clamping head (1) and the second clamping head (2). The top rod end of the clamping pliers body (5) is provided with a drive pin, which is slidably connected in the drive pin groove (4) at the tail of the first clamping head (1) and the second clamping head (2).

8. The clip applier of Claim 7, wherein, The tail rod (501) of the clamp body (5) is coaxially connected to the tail rod end. The tail rod (501) is provided with a limiting ring groove (5011) at the rear end. The top of the handle of the clamp body (5) is equipped with a limiting protrusion (502) that cooperates with the limiting ring groove (5011).

9. The clip applier of Claim 8, wherein, The limiting ring groove (5011) is an arc groove, and the top of the limiting protrusion (502) is set as a ball head.

10. The clip applier of Claim 8, wherein, The top of the snap-fit ​​lug at the top of the movable handle of the clamp body (5) is set as a convex round head (503), and the tail rod (501) is set as a snap-fit ​​groove at the position corresponding to the snap-fit ​​lug, and the root of the snap-fit ​​groove is provided with a rounded corner (5012).

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