Forceps head assembling structure of laparoscopic surgical instrument

Abstract

The utility model discloses a forceps head assembly structure of a laparoscopic surgical instrument, the forceps head assembly structure comprises a forceps head and a connecting rod which are separated from each other, the connecting rod comprises an inner connecting rod and an outer connecting rod which are coaxially arranged, the forceps head comprises a shell and a traction part arranged in the shell, the outer connecting rod is connected with the shell, the inner connecting rod is connected with the traction part, and the inner connecting rod is connected with the shell. And the inner connecting rod can axially move in the outer connecting rod. The structure provided by the utility model comprises various assembling structures, so that the assembling connection of the connecting rod and the tong head can be realized, the defect that the current integrated structure cannot adapt to various standards and specifications is overcome, and the application scene is very good.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a forceps head assembly structure of a laparoscopic surgical instrument. Background Art

[0002] In laparoscopic surgery, different surgical forceps are used because the target organs are different. The conventional solution is to use the laparoscopic surgical channel to replace the surgical instruments to perform the surgery. Although this method is direct and effective, the objective disadvantages are also obvious. To meet this method, it is necessary to open a larger hole in the patient's abdomen for the surgical instruments to pass through, which will have a certain impact on the patient's postoperative recovery.

[0003] The patent publication (CN219461364U) discloses a laparoscopic surgical instrument assembled in vivo, in which the surgical forceps head is separated from the connecting rod and assembled in the abdominal cavity during the operation by means of a locking pin.

[0004] The inventor's prior application (2023211979585) designed a detachable and assembled laparoscopic surgical instrument, which can be assembled in the abdominal cavity during surgery by separating the inner pull rod and the outer pull rod from each other.

[0005] The inventor's prior application (202321713855X) disclosed a small-caliber detachable and assembled laparoscopic surgical instrument, which achieves the purpose of minimally invasive surgery by reducing the rod diameter of the pull rod, and the forceps head still adopts a design structure separated from the connecting rod.

[0006] The inventor's prior application (2023108628592) changes the traditional pull rod structure, adopts a sleeve-free structure design, and adopts a mode in which the pliers head and two pull rods can be separated and connected.

[0007] The inventor's prior application (2023114541350) adopted a locking clamp structure to lock the pliers head and the pull rod at different positions, so that the pliers head can be assembled inside or outside the abdominal cavity.

[0008] In order to solve the problem of portable assembly in the abdominal cavity, the inventor's prior application (2023114541223) proposed to assemble the clamp head and the pull rod in the abdominal cavity by means of a magnetic field.

[0009] The above existing technologies still face corresponding problems in actual clinical practice. In actual surgery, there are many types of surgical forceps, each with different functions, so the forceps are often not universal. In addition, the existing surgical forceps basically adopt an integrated structure, which is large in size and cannot meet the needs of minimally invasive surgery. Therefore, it is necessary to design various surgical forceps and pull rods separately to meet the needs of minimally invasive surgery. Summary of the invention

[0010] The purpose of the present invention is to provide an assembly structure, which improves the interconnection mode between the clamp head and the connecting rod by design, so as to realize effective assembly of the instrument.

[0011] To achieve the above object, the present invention adopts the following technical solution:

[0012] A forceps head assembly structure of a laparoscopic surgical instrument includes a forceps head and a connecting rod separated from each other, the connecting rod includes an inner connecting rod and an outer connecting rod arranged coaxially, the forceps head includes a shell and a traction part arranged in the shell, the outer connecting rod can be connected to the shell, the inner connecting rod can be connected to the traction part, and the inner connecting rod can move axially in the outer connecting rod.

[0013] In the above solution, a keyway is provided on the outer connecting rod, and a key protruding from the surface of the outer connecting rod is provided in the keyway.

[0014] In the above solution, an inner slide groove is axially arranged in the shell along the connection direction, and the inner slide groove matches the key.

[0015] In the above solution, an annular groove is provided on the outer connecting rod, and a protrusion is provided in the shell body corresponding to the inner sliding groove.

[0016] In the above solution, the annular groove divides the outer connecting rod into a front section and a rear section, and an outer sliding groove is arranged on the front section along the axial direction, and the outer sliding groove matches the protrusion.

[0017] In the above solution, a locking buckle is provided between the outer connecting rod and the shell.

[0018] In the above solution, an annular groove is provided on the outer connecting rod, and the locking buckle can be arranged in the annular groove.

[0019] In the above solution, a protrusion is provided on the locking buckle, and an inner sliding groove is provided in the shell corresponding to the protrusion.

[0020] In the above solution, a latch is provided between the shell and the external connecting rod, and the latch connects the shell and the external connecting rod.

[0021] In the above solution, a key slot is provided on the outer connecting rod, a through hole is provided on the housing, and the latch passes through the through hole and is inserted into the key slot.

[0022] In the above solution, threads are arranged on the outer surface of the shell, and a locking sleeve is connected via the threads, and the locking sleeve can cover the through hole on the shell.

[0023] In the above solution, a clamp is provided between the shell and the external connecting rod, and two ends of the clamp are respectively connected to the shell and the external connecting rod.

[0024] In the above solution, one end of the clamp is inserted into the housing, and the other end of the clamp is a petal-shaped structure, which clamps the outer connecting rod.

[0025] In the above solution, an annular groove is provided on the outer connecting rod, and a convex tooth is provided on the inner wall of the petal-shaped structure, and the convex tooth can be buckled with the annular groove.

[0026] In the above solution, a locking sleeve is included, the locking sleeve is connected to the housing through threads, and the clamp is arranged in the locking sleeve.

[0027] In the above scheme, a circular hole is arranged on the outer connecting rod, a through hole penetrating the shell is arranged on the shell, a ball is arranged between the through hole and the circular hole, and the diameter of the ball is smaller than the through hole and larger than the circular hole.

[0028] In the above solution, the front end of the shell is connected to a fixing block via threads, the fixing block and the surface of the shell form a cavity in the axial direction, and the circular hole is arranged in the cavity.

[0029] In the above solution, a sliding block is coaxially arranged in the cavity with the shell, a spring is arranged between the sliding block and the fixed block, and a ball is arranged between the sliding block and the shell.

[0030] In the above solution, a thermal clamp is coaxially arranged inside the shell and between the outer connecting rod.

[0031] In the above solution, a plurality of resistance wires are arranged in the thermal clamp.

[0032] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0033] The structure proposed in the present application includes a variety of assembly structures, which can realize the assembly connection between the connecting rod and the pliers head, solving the defect that the current one-piece structure cannot adapt to a variety of standards and specifications, and has a good application scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0035] Figure 1is a schematic diagram of a structural cross-section of the first embodiment;

[0036] Figure 2 is a schematic diagram of the overall structure of the first embodiment;

[0037] Figure 3 is a schematic cross-sectional view of the structure of the second embodiment;

[0038] Figure 4 is a schematic diagram of the overall structure of the second embodiment;

[0039] Figure 5 is a schematic diagram of the overall structure of the third embodiment;

[0040] Figure 6 is a cross-sectional schematic diagram of embodiment 3;

[0041] Figure 7 is a schematic structural diagram of Embodiment 4;

[0042] Figure 8 is a structural diagram of Embodiment 5;

[0043] Fig. 9 is a schematic diagram of the explosion structure of the fifth embodiment;

[0044] Fig.10 is a structural diagram of Embodiment 6;

[0045] Fig.11 is a structural diagram of Embodiment 7;

[0046] Among them: 1 is the shell, 2 is the traction part, 3 is the positioning key, 4 is the outer connecting rod, 5 is the inner connecting rod, 6 is the inner slide groove, 7 is the ring groove, 8 is the locking buckle, 9 is the inner protrusion, 10 is the outer slide groove, 11 is the locking sleeve, 12 is the pin, 13 is the clamp, 14 is the thermal clamp, 15 is the resistance wire, 16 is the slider, 17 is the fixing block, 18 is the spring, and 19 is the ball bearing. DETAILED DESCRIPTION

[0047] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0048] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0049] The connecting rod described in this embodiment includes an external connecting rod and an internal connecting rod in an actual surgical instrument. The length of the external connecting rod is fixed, the rear end is fixedly connected to the hand-held part, and the front end is connected to the shell of the forceps head. During the operation, the relative position of the external connecting rod will not change, so the external connecting rod and the forceps head do not need to be fixedly connected. Embodiment 1

[0050] like Figure 1 and Figure 2 As shown, the pliers head structure includes a housing 1 and a traction part 2 arranged therein, and a cavity is arranged in the housing 1 for a connecting rod to pass through. The connecting rod includes an outer connecting rod 4 and an inner connecting rod 5, and the inner connecting rod 5 is connected to the traction part 2 in the pliers head by threads, and the outer connecting rod 4 is in limited contact with the housing 1.

[0051] like Figure 2 As shown, an inner groove 6 is provided on the inner wall of the housing 1 along the axis of the cavity, and a keyway is provided on the outer wall of the outer connecting rod 4, and a positioning key 3 is provided in the keyway. When the inner connecting rod 5 and the outer connecting rod 4 are inserted into the housing 1 of the pliers head together, the positioning key 3 is inserted into the inner groove 6. When the inner connecting rod 5 is fixedly connected to the pliers head, the inner connecting rod 5 can be driven to rotate together by the pliers head while the outer connecting rod 4 is rotated due to the relative matching of the positioning key 3 and the inner groove 6. Most of the force of the entire connecting rod will be borne by the outer connecting rod 4 and the pliers head part, and the external force will not bring additional influence to the inner connecting rod 5, ensuring that the inner connecting rod 5 will not be deformed. Embodiment 2

[0052] This embodiment is based on the first embodiment, and the structure inside the clamp head housing 1 and the structure of the external connecting rod 4 are mutually adjusted to achieve the same function.

[0053] like Figure 3 and Figure 4 As shown, in this embodiment, a radially protruding inner convex block 9 is provided on the inner wall of the housing 1, and an annular groove 7 is provided on the outer wall of the rod body of the outer connecting rod 4. The annular groove 7 divides the outer connecting rod 4 into two sections, front and rear, and an outer slide groove 10 is provided on the surface of the front section along the axial direction. During the connection process, when the inner connecting rod 5 and the outer connecting rod 4 are inserted into the housing 1, the outer slide groove 10 slides along the inner convex block 9 until the inner convex block 9 enters the annular groove 7.

[0054] In this embodiment, when the connected outer connecting rod 4 is subjected to a large torque, the inner protrusion 9 can slide in a circle in the annular groove 7, thereby avoiding the loss of rigidity of the outer connecting rod 4 and the inner connecting rod 5 due to the large force. At the same time, because the annular groove 7 limits the inner protrusion 9, the outer connecting rod 4 will not be easily withdrawn from the clamp head housing 1, and the clamp head will not fall off. Embodiment 3

[0055] like Figure 5 As shown, based on the first and second embodiments, the connection method between the external connecting rod 4 and the housing 1 is optimized and improved.

[0056] An annular groove 7 is provided on the outer surface of the outer connecting rod 4, and an independent locking buckle 8 is provided between the outer connecting rod 4 and the housing 1, and the locking buckle 8 can be sleeved on the annular groove 7. An inner slide groove 6 is axially provided on the inner wall of the housing 1, and the inner slide groove 6 matches the protrusion on the locking buckle 8.

[0057] The locking buckle 8 in this embodiment is designed as an open-loop structure, which has a small amount of deformation ability, and a stepped cavity is set in the shell 1. When the locking control couple 8 is brought into the shell 1 by the annular groove 7, the locking buckle 8 can fix the external connecting rod 4 in the shell 1 to prevent the external connecting rod 4 from falling off from the shell 1. Figure 6 shown. Embodiment 4

[0058] like Figure 7 As shown, the structure of the first embodiment is optimized and improved.

[0059] The outer surface of the connecting end of the housing 1 is provided with a threaded structure, and a locking sleeve 11 is connected to the threaded structure by threads. The threaded structure is provided with a through hole penetrating the surface of the housing 1, and the locking sleeve 11 can cover the through hole.

[0060] A keyway is provided on the outer connecting rod 4. When the outer connecting rod 4 is inserted into the housing 1, a latch 12 is inserted through the through hole of the housing 1. The latch 12 passes through the through hole and is inserted into the keyway of the outer connecting rod 4. The locking sleeve 11 is then used to connect the outer connecting rod 4 to the housing 1. The locking sleeve 11 is rotated until the latch 12 is covered to prevent the latch 12 from falling off.

[0061] The structure of this embodiment can fix the housing 1 and the outer connecting rod 4 together. When the inner connecting rod 5 is fixedly connected to the traction part 2, it is equivalent to that the inner connecting rod 5 and the outer connecting rod 4 are fixedly connected to the clamp head at the same time, thereby increasing the reliability of the connection. Embodiment 5

[0062] This embodiment optimizes the structure on the basis of the fourth embodiment, and adds a clamp 13 and a locking sleeve 11 between the connecting rod and the clamp head, specifically:

[0063] The outer surface of the connection end of the pliers head housing 1 is provided with an external thread for connecting the locking sleeve 11. A movable clamp 13 is inserted into the end of the housing 1. When the connecting rod is connected to the pliers head, the clamp 13 is sleeved on the connecting rod, and then the clamp 13 is connected to the housing 1 through the locking sleeve 11 to fix the clamp 13. The overall position relationship from inside to outside after connection is: inner connecting rod 5, outer connecting rod 4, clamp 13 and housing 1, locking sleeve 11, as shown in FIG. Figure 8 shown.

[0064] like Fig. 9 As shown, an annular groove 7 is provided on the outer connecting rod 4, and a petal-shaped structure is provided at one end of the clamp 13. The inside of the petal-shaped structure is provided with convex teeth along the radial direction, and the convex teeth can be buckled in the annular groove 7 of the outer connecting rod 4 to prevent the outer connecting rod 4 from falling off. Embodiment 6

[0065] This embodiment is an extended structural design of the fifth embodiment, and optimizes its connection mode, specifically:

[0066] like Fig.10 As shown, a plurality of circular holes are arranged on the outer connecting rod 4, and the circular holes are distributed in the same circumferential direction. An external thread is arranged at the front end of the connecting end of the housing 1, and a fixing block 17 is connected through the external thread. The fixing block 17 and the outer surface of the housing 1 after connection form a cavity in the axial direction, and a through hole is arranged at the bottom of the cavity to penetrate the housing. A sliding block 16 is arranged coaxially with the housing 1 in the cavity, and a boss is arranged inside the sliding block 16. A spring 18 coaxial with the housing 1 is arranged between the front end of the boss, the sliding block 16, and the fixing block 17, and a ball 19 is arranged between the rear end of the boss, the sliding block 16, and the housing 1.

[0067] Its working principle is that when the external connecting rod 4 is inserted into the shell 1, the circular hole and the through hole of the cavity are aligned, and the ball 19 falls into the circular hole through the through hole. The diameter of the ball 19 is larger than the circular hole, so the ball 19 is stuck between the through hole and the circular hole. The force of the spring 18 pushes the sliding block 16 to move, and the ball is pressed into the through hole by the boss, so as to fix the shell 1 and the external connecting rod 4. When the external force acts on the sliding block 16, the sliding block 16 compresses the spring 18, the convex block moves to expose the ball 19, and the external connecting rod 4 is pulled. The ball 19 moves from the circular hole to the through hole under the action of the external force, and the sliding block 16 is released. The sliding block 16 is reset under the action of the spring 18, and the ball is fixed in the shell 1. Embodiment 7

[0068] This embodiment is an extended design of the first to sixth embodiments, and changes the traditional clamping method, specifically:

[0069] A heat clamp 14 is coaxially arranged between the inside of the housing 1 and the external connecting rod 4. The heat clamp 14 uses the principle of thermal expansion and contraction to clamp the external connecting rod 4. To this end, a plurality of resistance wires 15 are arranged in the heat clamp 14. When the resistance wires 15 are energized, the heat clamp 14 expands in all directions due to the heat, thereby squeezing the housing 1 and the external connecting rod 4 and fixing the external connecting rod 4. Fig.11 shown.

[0070] Because the actual use scenario of this embodiment is laparoscopic surgery, the requirement for clamping force is not particularly high, so the extrusion force provided by the thermal expansion method proposed in this embodiment can meet actual needs.

[0071] All of the above embodiments can be applied in different surgical environments, and one of the embodiments can be used to construct surgical instruments for different surgeries.

[0072] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A forceps head assembly structure for a laparoscopic surgical instrument, characterized in that: It comprises a pliers head and a connecting rod separated from each other, wherein the connecting rod comprises an inner connecting rod and an outer connecting rod arranged coaxially, the pliers head comprises a shell and a traction part arranged in the shell, the outer connecting rod can be connected to the shell, the inner connecting rod can be connected to the traction part, and the inner connecting rod can move axially in the outer connecting rod.

2. The laparoscopic surgical instrument forceps assembly structure according to claim 1, characterized in that The outer connecting rod is provided with a keyway, and the keyway is provided with a key protruding from the surface of the outer connecting rod.

3. The laparoscopic surgical instrument forceps assembly structure according to claim 2, characterized in that An inner slide groove is axially arranged in the shell along the connection direction, and the inner slide groove matches the key.

4. The forceps assembly structure of a laparoscopic surgical instrument according to claim 1, characterized in that The outer connecting rod is provided with an annular groove, and the shell body is provided with a protrusion corresponding to the inner sliding groove.

5. The laparoscopic surgical instrument forceps assembly structure according to claim 4, characterized in that The annular groove divides the outer connecting rod into a front section and a rear section. The front section is provided with an outer sliding groove along the axial direction, and the outer sliding groove matches the protruding portion.

6. The laparoscopic surgical instrument forceps assembly structure according to claim 1, characterized in that A locking buckle is arranged between the outer connecting rod and the shell.

7. The forceps assembly structure of a laparoscopic surgical instrument according to claim 6, characterized in that The outer connecting rod is provided with an annular groove, and the locking buckle can be arranged in the annular groove.

8. A laparoscopic surgical instrument forceps assembly structure according to claim 6 or 7, characterized in that The locking buckle is provided with a protrusion, and an inner sliding groove is provided in the shell body corresponding to the protrusion.

9. The forceps assembly structure of a laparoscopic surgical instrument according to claim 1, characterized in that A latch is provided between the shell and the outer connecting rod, and the latch connects the shell and the outer connecting rod.

10. The forceps assembly structure of a laparoscopic surgical instrument according to claim 9, characterized in that The outer connecting rod is provided with a keyway, the shell is provided with a through hole, and the latch passes through the through hole and is inserted into the keyway.

11. The laparoscopic surgical instrument forceps assembly structure according to claim 10, characterized in that The outer surface of the shell is provided with threads, and a locking sleeve is connected via the threads. The locking sleeve can cover the through hole on the shell.

12. The laparoscopic surgical instrument forceps assembly structure according to claim 1, characterized in that A clamp is arranged between the shell and the external connecting rod, and two ends of the clamp are respectively connected to the shell and the external connecting rod.

13. The laparoscopic surgical instrument forceps assembly structure according to claim 12, characterized in that One end of the clamp is inserted into the shell, and the other end of the clamp is a petal-shaped structure, which clamps the outer connecting rod.

14. The laparoscopic surgical instrument forceps assembly structure according to claim 13, characterized in that The outer connecting rod is provided with an annular groove, and the inner wall of the petal-shaped structure is provided with convex teeth, and the convex teeth can be buckled with the annular groove.

15. A laparoscopic surgical instrument forceps head assembly structure according to any one of claims 12 to 14, characterized in that It comprises a locking sleeve, which is connected to the housing through threads, and the clamp is arranged in the locking sleeve.

16. The forceps assembly structure of a laparoscopic surgical instrument according to claim 1, characterized in that The outer connecting rod is provided with a circular hole, the shell is provided with a through hole penetrating the shell, a ball is provided between the through hole and the circular hole, and the diameter of the ball is smaller than the through hole and larger than the circular hole.

17. The forceps assembly structure of a laparoscopic surgical instrument according to claim 16, characterized in that The front end of the shell is connected with a fixing block through a thread, the fixing block and the surface of the shell form a cavity in the axial direction, and the circular hole is arranged in the cavity.

18. The forceps assembly structure of a laparoscopic surgical instrument according to claim 17, characterized in that A sliding block is coaxially arranged in the cavity with the shell, a spring is arranged between the sliding block and the fixed block, and a ball bearing is arranged between the sliding block and the shell.

19. The forceps assembly structure of a laparoscopic surgical instrument according to claim 1, characterized in that A thermal clamp is coaxially arranged inside the housing and between the outer connecting rod.

20. The forceps assembly structure of a laparoscopic surgical instrument according to claim 19, characterized in that A plurality of resistance wires are arranged in the thermal clamp.

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