Circumferential positioning structure and laparoscopic surgical instrument having the same

Abstract

The present application relates to the technical field of medical apparatus and instruments, and discloses a circumferential positioning structure and a laparoscopic surgical instrument with the same, the circumferential positioning structure comprising: a base; a rotating shaft body rotatably arranged on the base; a first positioning corrugated portion arranged on the rotating shaft body; and an open snap ring coaxially arranged with the rotating shaft body, wherein the open snap ring is made of elastic material, an inner side peripheral wall of the open snap ring is provided with a second positioning corrugated portion, the second positioning corrugated portion is adapted to be in elastic interference with the first positioning corrugated portion, the open snap ring comprises a first clamping arm and a second clamping arm, the first clamping arm and the second clamping arm are oppositely arranged along a first radial direction and form an adjusting gap, and the width of the adjusting gap is adjusted according to the size of the elastic interference. In the present application, the open snap ring does not need to be machined in a slot during the machining process, and can be directly clamped with the base during the assembly process, thereby greatly simplifying the preparation process and reducing the preparation difficulty.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a circumferential positioning structure and a laparoscopic surgical instrument having the same. Background Technology

[0002] Laparoscopic minimally invasive surgery typically involves manipulating laparoscopic surgical instruments outside the abdominal cavity to explore, electrocoagulate, stop bleeding, separate and cut tissues, and suture lesions within the abdominal cavity.

[0003] Existing laparoscopic minimally invasive surgical instruments typically utilize methods such as... Figure 1 The positioning structure shown provides circumferential positioning for the tool holder shaft. The structure includes a first positioning element 91 and a second positioning element 92. One axial end of the first positioning element 91 is circumferentially fixed to the shaft, while the other end has several positioning grooves 911 evenly distributed around its circumference. The second positioning element 92 has an axially oriented mounting groove 921 containing a positioning ball 93 and a spring 94. The second positioning element 92 covers the mounting groove 921 with a cover plate 95. The cover plate 95 has a limiting hole to allow at least a partial exposure of the positioning ball 93 under the spring action of the spring 94, and to allow the positioning ball 93 to engage with the positioning grooves 911. During shaft rotation, the positioning ball 93 engages with any one of the positioning grooves 911, thereby providing circumferential positioning for the shaft. However, this circumferential positioning structure not only requires slotting the first positioning component 91, the second positioning component 92 and the cover plate 95 in sequence during machining, but also requires laser welding of the cover plate 95 and the second positioning component 92 during assembly. The required tooling fixtures are relatively complex and the manufacturing process is relatively complex. Summary of the Invention

[0004] In view of this, the present invention provides a circumferential positioning structure and a laparoscopic surgical instrument having the same, to solve the problem of the complex manufacturing process of the circumferential positioning structure of existing laparoscopic minimally invasive surgical instruments. The circumferential positioning structure of the present invention has a first positioning corrugated portion on the outer peripheral wall of the rotating shaft body along the circumferential direction, and a second positioning corrugated portion on the inner peripheral wall of the open retaining ring. The second positioning corrugated portion can elastically interfere with and fully engage with the first positioning corrugated portion, thereby enabling circumferential positioning of the rotating shaft body at any angle during circumferential rotation relative to the base. The open retaining ring includes an integrally formed first retaining arm and a second retaining arm. The open retaining ring does not require machining or grooving during processing; it can be directly snapped onto the base during assembly, eliminating the need for tooling fixtures and laser welding, thus greatly simplifying the manufacturing process and reducing manufacturing difficulty and cost.

[0005] In a first aspect, the present invention provides a circumferential positioning structure, comprising:

[0006] Base;

[0007] The rotating shaft body is rotatably mounted on the base; a first positioning corrugated portion is provided on the outer peripheral wall of the rotating shaft body in at least a portion along the circumferential direction;

[0008] An open retaining ring is fixedly installed on one axial side of the base and is coaxially arranged with the rotating shaft body. The open retaining ring is made of elastic material and has a second positioning corrugated part on its inner peripheral wall. The second positioning corrugated part is adapted to elastically interfere with the first positioning corrugated part.

[0009] The open retaining ring includes a first retaining arm and a second retaining arm. The first retaining arm and the second retaining arm are arranged at a distance from each other along a first radial direction to form an adjustment notch. The width of the adjustment notch is adapted to be adjusted according to the elastic interference between the second positioning corrugated part and the first positioning corrugated part.

[0010] The outer peripheral wall of the rotating shaft body is provided with a first positioning corrugated portion along the circumferential direction at least partially, and the inner peripheral wall of the open retaining ring is provided with a second positioning corrugated portion. The second positioning corrugated portion can elastically interfere with and fully engage with the first positioning corrugated portion, thereby positioning the rotating shaft body at any angle during the circumferential rotation of the rotating shaft body relative to the base. The open retaining ring includes an integrally formed first retaining arm and a second retaining arm. No machining grooving is required during the processing, and it can be directly snapped into the base during the assembly process. No tooling fixtures or laser welding are required, which greatly simplifies the manufacturing process and reduces the manufacturing difficulty and cost.

[0011] In one optional embodiment, a first mounting plate is provided on the side of the base close to the open retaining ring along the axial direction, and a first limiting groove and a second limiting groove are provided on the first mounting plate along the axial direction; a first retaining claw and a second retaining claw are provided on the side of the open retaining ring close to the base along the axial direction.

[0012] One axial end of the first claw is connected to the first claw arm, and the other end is engaged with the first limiting groove.

[0013] One end of the second claw is connected to the second claw arm, and the other end is engaged with the second limiting groove.

[0014] The first claw engages with the first limiting groove to engage the first clamping arm with the first mounting plate, and the second claw engages with the second limiting groove to engage the second clamping arm with the first mounting plate. This allows the open clamping ring and the first mounting plate to be fixed by a snap fastener, which is convenient for disassembly and assembly. No tooling or fixtures are required, and no laser welding is needed, which greatly simplifies the manufacturing process and reduces the manufacturing difficulty.

[0015] In one optional embodiment, the first claw includes a first sliding portion and a first abutting portion. The first sliding portion is formed by the first claw arm extending axially toward the base, and the first abutting portion is formed by the first sliding portion extending radially away from the second claw arm. The first sliding portion is adapted to move radially within the first limiting groove, and the first abutting portion is adapted to pass through the first limiting groove axially and always remain abutting against the side of the first mounting plate axially away from the open retaining ring.

[0016] The second claw includes a second sliding portion and a second abutting portion. The second sliding portion is formed by the second claw arm extending axially toward the base. The second abutting portion is formed by the second sliding portion extending radially away from the first claw arm. The second sliding portion is adapted to move radially within the second limiting groove. The second abutting portion is adapted to pass through the second limiting groove axially and always abut against the side of the first mounting plate axially away from the open retaining ring.

[0017] During assembly, the first abutting part passes through the first limiting groove axially, and then, under the elastic restoring force of the open retaining ring, it remains in contact with the side of the first mounting plate axially away from the open retaining ring, ensuring that the first retaining arm and the first mounting plate are always in a snap-fit ​​state. Simultaneously, the second abutting part passes through the second limiting groove axially, and then, under the elastic restoring force of the open retaining ring, it remains in contact with the side of the first mounting plate axially away from the open retaining ring, ensuring that the second retaining arm and the first mounting plate are always in a snap-fit ​​state, thus preventing the open retaining ring from detaching from the base. During operation, with the approximately periodic elastic interference between the first and second positioning corrugated parts, the first sliding part moves radially within the first limiting groove, and simultaneously, the second sliding part moves radially within the second limiting groove. This allows for adjustment of the notch width, enabling circumferential positioning of the rotating shaft body at any angle during circumferential rotation relative to the base. Furthermore, it ensures the firmness and stability of the connection between the open retaining ring and the base before and after the elastic interference.

[0018] In one alternative embodiment, before the first positioning corrugated part is built into the second positioning corrugated part, the adjustment notch closes from its natural state along the first radial direction under the action of external force until the first abutting part and / or the second abutting part disengages from the first mounting plate.

[0019] After the first positioning corrugated part is built into the second positioning corrugated part, during the process of the adjustment notch closing from its natural state along the first radial direction, both the first abutting part and the second abutting part remain in contact with the first mounting plate at all times.

[0020] When the first positioning corrugated part abuts against the second positioning corrugated part, the width of the adjustment notch can no longer be reduced. Both the first abutting part and the second abutting part remain in contact with the first mounting plate, thereby preventing the open retaining ring from detaching from the first mounting plate. This not only greatly simplifies the assembly process but also ensures the reliability of the open retaining ring's engagement with the base. At the same time, it can also perform circumferential positioning of the rotating shaft body at any angle during the circumferential rotation of the rotating shaft body relative to the base.

[0021] In one optional embodiment, a third limiting groove is also provided on the first mounting plate along the axial direction, and a third pawl is also provided on the side of the open retaining ring close to the base along the axial direction. One end of the third pawl is connected to both the first and second retaining arms, and the other end is engaged with the third limiting groove.

[0022] The third claw engages with the third limiting groove to fix the open retaining ring to the first mounting plate, thereby maintaining the relative position between the open retaining ring and the base and preventing the open retaining ring from shifting relative to the base during the reciprocating sliding of the first sliding part and / or the second sliding part along the first radial direction.

[0023] In one optional embodiment, the third latch includes a first latching portion, a second latching portion, and a third latching portion. The first latching portion is formed by an open retaining ring extending axially toward the base. The second and third latching portions are both formed by the first latching portion extending radially away from the adjustment notch. The first latching portion is adapted to engage with the third limiting groove. The second and third latching portions are adapted to pass through the third limiting groove axially and always maintain contact with the side of the first mounting plate axially away from the open retaining ring.

[0024] The first locking part engages with the third limiting groove, thereby radially fixing the open retaining ring to the first mounting plate. The second and third locking parts, after passing through the third limiting groove axially, always abut against the side of the first mounting plate away from the open retaining ring axially, thereby axially fixing the open retaining ring to the first mounting plate. At the same time, the third claw, the first claw, and the second claw together limit the open retaining ring, which not only ensures the reliability of the engagement between the open retaining ring and the first mounting plate, but also allows for the adjustment of the width of the notch, thereby enabling circumferential positioning of the rotating shaft body at any angle during circumferential rotation relative to the base.

[0025] In one optional embodiment, the second and third snap-fit ​​portions are spaced apart circumferentially to form a fourth limiting groove; a rib is fixedly provided on the side of the first mounting plate away from the open snap ring along the axial direction, and the rib is adapted to snap into the fourth limiting groove.

[0026] By engaging the rib with the fourth limiting groove, the open retaining ring and the first mounting plate are further circumferentially fixed. This not only helps ensure the reliability of the engagement between the open retaining ring and the first mounting plate, but also helps ensure the assembly accuracy between the open retaining ring and the first mounting plate. It also ensures that the elastic interference between the first positioning corrugated part and the second positioning corrugated part is within the design range, thereby facilitating circumferential positioning of the rotating shaft body at any angle during the circumferential rotation of the rotating shaft body relative to the base.

[0027] In a second aspect, the present invention also provides a laparoscopic surgical instrument, comprising: a laparoscopic surgical instrument body, and a circumferential positioning structure as described above.

[0028] The base and the rotating shaft are rotatably connected by bearings.

[0029] The base and the rotating shaft body are rotatably connected by bearings to ensure the coaxiality between the rotating shaft body, the base, and the open retaining ring, and to ensure that the elastic interference between the first positioning corrugated part and the second positioning corrugated part is within the design range. This facilitates circumferential positioning of the rotating shaft body at any angle during the circumferential rotation of the rotating shaft body relative to the base.

[0030] In one alternative embodiment, an open retaining ring is provided on the side of the bearing axially away from the open retaining ring, and the open retaining ring is adapted to position the bearing axially.

[0031] A second mounting plate is also provided on the side of the base away from the open retaining ring along the axial direction. The second mounting plate is engaged with the open retaining ring.

[0032] An open retaining ring is provided on the side of the bearing away from the open retaining ring along the axial direction to position the bearing axially. A second mounting plate is also provided on the side of the base away from the open retaining ring along the axial direction. The second mounting plate can be assembled by engaging with the open retaining ring.

[0033] In one alternative embodiment, a first slot is radially provided on the second mounting plate; the opening retaining ring is made of elastic material and includes a fourth and a fifth engaging portion spaced apart circumferentially, the fourth and fifth engaging portions being adapted to engage in the first slot when the opening retaining ring is subjected to pressure.

[0034] The second mounting plate has a second slot along the radial direction, and the outer peripheral wall of the open retaining ring extends radially away from the central axis to form a sixth engaging part, which is adapted to engage with the second slot.

[0035] During assembly, when the open retaining ring is subjected to external pressure, the circumferential distance between the fourth and fifth locking parts decreases. When the external pressure is removed, due to the elastic restoring force of the open retaining ring itself, the circumferential distance between the fourth and fifth locking parts returns to its initial state, thereby making the fourth and fifth locking parts stably locked in the first slot. At the same time, the sixth locking part is locked in the second slot. This not only ensures the reliability of the connection between the open retaining ring and the second mounting plate, but also helps to simplify the processing and assembly process. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram illustrating the working principle of the circumferential positioning structure of the laparoscopic minimally invasive surgical instruments before the improvement in the background art.

[0038] Figure 2 This is an exploded view of a circumferential positioning structure according to an embodiment of the present invention;

[0039] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0040] Figure 4 for Figure 2 A three-dimensional structural diagram of the base along the axial direction near the open retaining ring;

[0041] Figure 5 for Figure 2 A three-dimensional structural diagram of the open retaining ring in the middle;

[0042] Figure 6 for Figure 2 A three-dimensional structural diagram of the base along the axial direction away from the open retaining ring;

[0043] Figure 7 This is a schematic diagram illustrating the connection principle between an open retaining ring and a first mounting plate according to an embodiment of the present invention;

[0044] Figure 8 for Figure 7 A magnified view of part B in the diagram;

[0045] Figure 9 for Figure 7 A magnified view of part of C;

[0046] Figure 10 This is a front view schematic diagram of the connection between an open retaining ring and a second mounting plate according to an embodiment of the present invention;

[0047] Figure 11 This is a schematic diagram illustrating the connection principle between an open retaining ring and a second mounting plate according to an embodiment of the present invention.

[0048] Figure 12 for Figure 11 A magnified view of part of D;

[0049] Figure 13 for Figure 11 A magnified view of part of E in the diagram.

[0050] Explanation of reference numerals in the attached figures:

[0051] 10. Base; 100. Rib plate; 11. First mounting plate; 111. First limiting groove; 112. Second limiting groove; 113. Third limiting groove; 12. Second mounting plate; 121. First slot; 122. Second slot;

[0052] 20. Rotating shaft body; 200. First positioning corrugated part;

[0053] 30. Open retaining ring; 300. Second positioning corrugated part; 31. First retaining arm; 310. First retaining claw; 311. First sliding part; 312. First abutting part; 32. Second retaining arm; 320. Second retaining claw; 321. Second sliding part; 322. Second abutting part; 33. Adjustment notch; 330. Third retaining claw; 331. First locking part; 332. Second locking part; 333. Third locking part; 34. Fourth limiting groove;

[0054] 40. Bearings;

[0055] 50. Opening retaining ring; 51. Fourth snap-fit ​​part; 52. Fifth snap-fit ​​part; 53. Sixth snap-fit ​​part. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] The following is combined with Figures 2 to 13 The following describes embodiments of the present invention.

[0058] According to an embodiment of the present invention, in one aspect, a circumferential positioning structure is provided, comprising:

[0059] Base 10;

[0060] The rotating shaft body 20 is rotatably mounted on the base 10; a first positioning corrugated portion 200 is provided on the outer peripheral wall of the rotating shaft body 20 along the circumferential direction at least in part.

[0061] An open retaining ring 30 is fixedly disposed on one axial side of the base 10. The open retaining ring 30 is coaxially disposed with the rotating shaft body 20. The open retaining ring 30 is made of elastic material. A second positioning corrugated part 300 is provided on the inner peripheral wall of the open retaining ring 30. The second positioning corrugated part 300 is adapted to elastically interfere with the first positioning corrugated part 200.

[0062] The open retaining ring 30 includes a first retaining arm 31 and a second retaining arm 32. The first retaining arm 31 and the second retaining arm 32 are arranged at a relative distance along a first radial direction to form an adjustment notch 33. The width of the adjustment notch 33 is adapted to be adjusted according to the elastic interference between the second positioning corrugated part 300 and the first positioning corrugated part 200.

[0063] It should be noted that the principle of "elastic interference" refers to the following: when the second positioning corrugated part 300 is fully engaged with the first positioning corrugated part 200, the adjusting notch 33 has its initial width in its natural state; when the second positioning corrugated part 300 is not fully engaged with the first positioning corrugated part 200, because the open retaining ring 30 is made of elastic material, the adjusting notch 33 opens at least partially in its natural state along the first radial direction, so that during the rotation of the shaft body 20 relative to the open retaining ring 30, the first positioning corrugated part 200 and the second positioning corrugated part 300 are always in a contacting state; during the rotation of the shaft body 20, the second positioning corrugated part 300... Each time the first positioning corrugated part 200 is fully engaged, the open retaining ring 30 completes a circumferential positioning of the rotating shaft body 20. During the rotation cycle between each adjacent fully engaged action, the second positioning corrugated part 300 and the first positioning corrugated part 200 are in a partially engaged state. The adjusting notch 33 opens at least part of its width from its natural state along the first radial direction to achieve "elastic interference" between the first positioning corrugated part 200 and the second positioning corrugated part 300. When the second positioning corrugated part 300 and the first positioning corrugated part 200 are fully engaged, the open retaining ring 30 promptly returns to the initial width of the adjusting notch 33 through its own elastic restoring force.

[0064] It should be noted that, please refer to Figure 2As shown, the circumferential positioning structure provided in this embodiment mainly includes a base 10, a rotating shaft body 20, and an open retaining ring 30. The base 10 can be fixedly installed inside the handle of a laparoscopic surgical instrument. One axial end of the rotating shaft body 20 is rotatably connected to the base 10 via a bearing, and the other end is adapted to drive the distal end of the instrument to rotate circumferentially relative to the base 10. The open retaining ring 30 can be detachably and fixedly connected to the base 10. Please refer to... Figure 3 As shown, a first positioning corrugated portion 200 is at least partially provided on the outer peripheral wall of the rotating shaft body 20 along the circumferential direction. In this embodiment, the first positioning corrugated portion 200 can be symmetrically arranged on both sides of the rotating shaft body 20 along the first radial direction, and the first positioning corrugated portion 200 can be integrally formed with the rotating shaft body 20; the open retaining ring 30 is coaxially arranged with the rotating shaft body 20, and the open retaining ring 30 can be made of plastic material to have the elasticity required to achieve elastic interference. A second positioning corrugated portion 300 is provided on the inner peripheral wall of the open retaining ring 30, and the second positioning corrugated portion 300 can... The first positioning corrugated part 200 is elastically interference-fitted and fully engaged, thereby enabling circumferential positioning of the rotating shaft body 20 at any angle during circumferential rotation relative to the base 10; the open retaining ring 30 includes a first retaining arm 31 and a second retaining arm 32, which can be integrally molded plastic structures. No machining or grooving is required during processing, and it can be directly snapped into the base 10 during assembly. No tooling fixtures or laser welding are required, which greatly simplifies the manufacturing process and reduces the manufacturing difficulty and cost.

[0065] It should be noted that, for better understanding, the terms "proximal" and "distal" are defined from the perspective of the physician (or other surgeon). Therefore, the term "proximal" refers to the side or end of the device closest to the external body wall and / or the surgeon, while the term "distal" refers to the side or end of the structure in the direction opposite to the external body wall and / or the surgeon.

[0066] In one embodiment, a first mounting plate 11 is provided on the side of the base 10 close to the open retaining ring 30 along the axial direction. The first mounting plate 11 is provided with a first limiting groove 111 and a second limiting groove 112 along the axial direction. The open retaining ring 30 is provided with a first retaining claw 310 and a second retaining claw 320 along the side of the base 10 along the axial direction.

[0067] One axial end of the first claw 310 is connected to the first claw arm 31, and the other end is engaged with the first limiting groove 111.

[0068] One axial end of the second claw 320 is connected to the second claw arm 32, and the other end is engaged with the second limiting groove 112.

[0069] It should be noted that a first mounting plate 11 is provided on the side of the base 10 closest to the open retaining ring 30 along the axial direction. Please refer to [link to relevant documentation]. Figure 4 As shown, a first limiting groove 111 and a second limiting groove 112 are formed along the axial direction on the first mounting plate 11. The first limiting groove 111 and the second limiting groove 112 are respectively disposed on both sides of the first mounting plate 11 along the first radial direction; please refer to Figure 5 As shown, the open retaining ring 30 has a first retaining claw 310 and a second retaining claw 320 on the side of the axial direction close to the base 10. The first retaining claw 310, the second retaining claw 320, the first retaining arm 31 and the second retaining arm 32 are integrally formed into the open retaining ring 30. The first retaining claw 310 engages with the first limiting groove 111 to engage the first retaining arm 31 with the first mounting plate 11. The second retaining claw 320 engages with the second limiting groove 112 to engage the second retaining arm 32 with the first mounting plate 11. Thus, the open retaining ring 30 and the first mounting plate 11 can be fixed by snapping together, which is convenient for disassembly and assembly. No tooling fixtures or laser welding are required, which greatly simplifies the manufacturing process and reduces the manufacturing difficulty.

[0070] In one embodiment, the first claw 310 includes a first sliding portion 311 and a first abutting portion 312. The first sliding portion 311 is formed by the first claw arm 31 extending axially toward the base 10, and the first abutting portion 312 is formed by the first sliding portion 311 extending radially away from the second claw arm 32. The first sliding portion 311 is adapted to move radially within the first limiting groove 111, and the first abutting portion 312 is adapted to pass through the first limiting groove 111 axially and always remain abutting against the side of the first mounting plate 11 axially away from the open retaining ring 30.

[0071] The second claw 320 includes a second sliding portion 321 and a second abutting portion 322. The second sliding portion 321 is formed by the second claw arm 32 extending axially toward the base 10. The second abutting portion 322 is formed by the second sliding portion 321 extending radially away from the first claw arm 31. The second sliding portion 321 is adapted to move radially within the second limiting groove 112. The second abutting portion 322 is adapted to pass through the second limiting groove 112 axially and always maintain abutment with the side of the first mounting plate 11 axially away from the open retaining ring 30.

[0072] It should be noted that, please refer to Figure 5 As shown, the first claw 310 includes a first sliding portion 311 and a first abutting portion 312, and the second claw 320 includes a second sliding portion 321 and a second abutting portion 322. Please combine them together. Figure 6 and Figure 9As shown, during assembly, the first abutting part 312 passes through the first limiting groove 111 axially, and then, under the elastic restoring force of the open retaining ring 30, it remains in contact with the side of the first mounting plate 11 axially away from the open retaining ring 30, ensuring that the first retaining arm 31 and the first mounting plate 11 are always in a snap-fit ​​state. Simultaneously, the second abutting part 322 passes through the second limiting groove 112 axially, and then, under the elastic restoring force of the open retaining ring 30, it remains in contact with the side of the first mounting plate 11 axially away from the open retaining ring 30, ensuring that the second retaining arm 32 and the first mounting plate 11 are always in a snap-fit ​​state, thereby preventing the opening... The retaining ring 30 disengages from the base 10. During operation, with the approximately periodic elastic interference between the first positioning corrugated part 200 and the second positioning corrugated part 300, the first sliding part 311 moves along the first radial direction in the first limiting groove 111, while the second sliding part 321 moves along the first radial direction in the second limiting groove 112. On the one hand, this enables the adjustment of the width of the adjusting notch 33, thereby enabling circumferential positioning of the rotating shaft body 20 at any angle during the circumferential rotation of the rotating shaft body 20 relative to the base 10. On the other hand, it ensures the firmness and stability of the connection between the open retaining ring 30 and the base 10 before and after the elastic interference.

[0073] In one embodiment, before the first positioning corrugated portion 200 is built into the second positioning corrugated portion 300, the adjustment notch 33 closes from its natural state along the first radial direction under the action of external force until the first abutting portion 312 and / or the second abutting portion 322 disengage from the first mounting plate 11.

[0074] After the first positioning corrugated part 200 is built into the second positioning corrugated part 300, during the process of the adjustment notch 33 closing from its natural state along the first radial direction, both the first abutting part 312 and the second abutting part 322 remain in contact with the first mounting plate 11.

[0075] It is worth noting that the assembly process of the circumferential positioning structure provided in this embodiment is very simple. During assembly, the open retaining ring 30 is first engaged with the base 10. Before engagement, the width of the adjusting notch 33 of the open retaining ring 30 is reduced under the action of external force. After the open retaining ring 30 and the base 10 are engaged and the external force is removed, the open retaining ring 30 is engaged with the first mounting plate 11 under the action of its own elastic restoring force. At this time, if external force is applied to the open retaining ring 30 again, the width of the adjusting notch 33 will decrease again until the first abutting part 312 and / or the second abutting part 322 disengage from the first mounting plate 11, thereby removing the open retaining ring 30 from the base 10. After the open retaining ring 30 and the base 10 are engaged, the rotating shaft body 20 and the base 10 are then connected by bearings. When the first positioning corrugated part 200 on the shaft body 20 and the second positioning corrugated part 300 on the open retaining ring 30 are located at the structural position specified in the design, if an external force is applied to the open retaining ring 30 again, the width of the adjustment notch 33 will decrease again. However, when the first positioning corrugated part 200 and the second positioning corrugated part 300 abut against each other, the width of the adjustment notch 33 cannot continue to decrease. The first abutting part 312 and the second abutting part 322 are always in contact with the first mounting plate 11, thereby preventing the open retaining ring 30 from detaching from the first mounting plate 11. This not only greatly simplifies the assembly process, but also ensures the reliability of the engagement between the open retaining ring 30 and the base 10. At the same time, it can also perform circumferential positioning of the shaft body 20 at any angle during the circumferential rotation of the shaft body 20 relative to the base 10.

[0076] In one embodiment, a third limiting groove 113 is also provided on the first mounting plate 11 along the axial direction, and a third claw 330 is also provided on the side of the open retaining ring 30 close to the base 10 along the axial direction. One end of the third claw 330 is connected to the first retaining arm 31 and the second retaining arm 32 at the same time, and the other end is engaged with the third limiting groove 113.

[0077] It should be noted that, please refer to Figure 4 As shown, a third limiting groove 113 is also provided on the first mounting plate 11 along the axial direction. The third limiting groove 113 is arranged on the first mounting plate 11 opposite to the first limiting groove 111 and the second limiting groove 112 in the second radial direction. Please refer to [link to relevant documentation]. Figure 5 As shown, the open retaining ring 30 is also provided with a third retaining claw 330 on the side of the axial direction close to the base 10. The third retaining claw 330 can be integrally formed with the first retaining arm 31 and the second retaining arm 32. The third retaining claw 330 engages with the third limiting groove 113 to fix the open retaining ring 30 on the first mounting plate 11, thereby maintaining the relative position between the open retaining ring 30 and the base 10 and preventing the open retaining ring 30 from shifting relative to the base 10 during the reciprocating sliding of the first sliding part 311 and / or the second sliding part 321 along the first radial direction.

[0078] In one embodiment, the third latch 330 includes a first latching portion 331, a second latching portion 332, and a third latching portion 333. The first latching portion 331 is formed by extending the open retaining ring 30 axially toward the base 10. The second latching portion 332 and the third latching portion 333 are both formed by extending the first latching portion 331 radially away from the adjustment notch 33. The first latching portion 331 is adapted to latch with the third limiting groove 113. The second latching portion 332 and the third latching portion 333 are adapted to pass through the third limiting groove 113 axially and always maintain contact with the side of the first mounting plate 11 axially away from the open retaining ring 30.

[0079] It should be noted that, please refer to Figure 5 As shown, the third latch 330 includes a first latching portion 331, a second latching portion 332, and a third latching portion 333, which are formed by extending the first latching portion 331 in a second radial direction away from the adjustment notch 33. Please refer to [link to relevant documentation]. Figure 8 As shown, the first locking part 331 engages with the third limiting groove 113, thereby radially fixing the open retaining ring 30 to the first mounting plate 11. The second locking part 332 and the third locking part 333 pass through the third limiting groove 113 axially and maintain contact with the side of the first mounting plate 11 away from the open retaining ring 30 axially, thereby axially fixing the open retaining ring 30 to the first mounting plate 11. At the same time, the third claw 330, the first claw 310 and the second claw 320 together limit the open retaining ring 30, which can not only ensure the reliability of the engagement between the open retaining ring 30 and the first mounting plate 11, but also realize the width adjustment of the adjustment notch 33, thereby enabling circumferential positioning of the rotating shaft body 20 at any angle during the circumferential rotation of the rotating shaft body 20 relative to the base 10.

[0080] In one embodiment, the second snap-fit ​​portion 332 and the third snap-fit ​​portion 333 are spaced apart circumferentially to form a fourth limiting groove 34; a rib plate 100 is fixedly provided on the side of the first mounting plate 11 away from the open snap ring 30 along the axial direction, and the rib plate 100 is adapted to snap into the fourth limiting groove 34.

[0081] It should be noted that, please refer to Figure 5 As shown, the second latching portion 332 and the third latching portion 333 form a fourth limiting groove 34 at circumferential intervals. Please refer to [link / reference]. Figure 8As shown, the rib 100 is disposed on the side of the first mounting plate 11 away from the open retaining ring 30 along the axial direction. The rib 100 is engaged with the fourth limiting groove 34, thereby further fixing the open retaining ring 30 and the first mounting plate 11 circumferentially. This not only helps to ensure the reliability of the engagement between the open retaining ring 30 and the first mounting plate 11, but also helps to ensure the assembly accuracy between the open retaining ring 30 and the first mounting plate 11. It also ensures that the elastic interference between the first positioning corrugated part 200 and the second positioning corrugated part 300 is within the design range, which in turn facilitates the circumferential positioning of the rotating shaft body 20 at any angle during the circumferential rotation of the rotating shaft body 20 relative to the base 10.

[0082] According to an embodiment of the present invention, in another aspect, a laparoscopic surgical instrument is also provided, comprising: a laparoscopic surgical instrument body, and a circumferential positioning structure as described above;

[0083] The base 10 and the rotating shaft body 20 are rotatably connected by a bearing 40.

[0084] It should be noted that, please refer to Figure 10 As shown, the base 10 and the rotating shaft body 20 are rotatably connected by the bearing 40 to ensure the coaxiality between the rotating shaft body 20, the base 10 and the open retaining ring 30, and to ensure that the elastic interference between the first positioning corrugated part 200 and the second positioning corrugated part 300 is within the design range, thereby facilitating the circumferential positioning of the rotating shaft body 20 at any angle during the circumferential rotation of the rotating shaft body 20 relative to the base 10.

[0085] In one embodiment, an open retaining ring 50 is provided on the side of the bearing 40 away from the open retaining ring 30 along the axial direction, and the open retaining ring 50 is adapted to position the bearing 40 axially.

[0086] A second mounting plate 12 is also provided on the side of the base 10 away from the open retaining ring 30 along the axial direction. The second mounting plate 12 is engaged with the open retaining ring 50.

[0087] It should be noted that, please refer to Figure 10 As shown, an open retaining ring 50 is provided on the side of the bearing 40 away from the open retaining ring 30 along the axial direction to position the bearing 40 axially. A second mounting plate 12 is also provided on the side of the base 10 away from the open retaining ring 30 along the axial direction. The second mounting plate 12 can be assembled by engaging with the open retaining ring 50.

[0088] In one embodiment, a first slot 121 is radially provided on the second mounting plate 12; the opening retaining ring 50 is made of elastic material and includes a fourth snap-fit ​​portion 51 and a fifth snap-fit ​​portion 52 arranged circumferentially spaced apart, the fourth snap-fit ​​portion 51 and the fifth snap-fit ​​portion 52 being adapted to snap into the first slot 121 when the opening retaining ring 50 is subjected to pressure.

[0089] The second mounting plate 12 has a second slot 122 radially provided. The outer peripheral wall of the opening retaining ring 50 extends radially away from the central axis to form a sixth engaging part 53, which is adapted to engage with the second slot 122.

[0090] It should be noted that conventional retaining ring mounting structures for holes typically involve creating a retaining groove around the circumference of the mounting hole, which is quite difficult to machine. For mounting structures different from conventional retaining rings for holes, please refer to [link to relevant documentation]. Figure 11 and Figure 12 As shown, a first slot 121 is radially formed on the second mounting plate 12; the opening retaining ring 50 is made of elastic material and includes a fourth engaging portion 51 and a fifth engaging portion 52 spaced apart circumferentially; please refer to Figure 11 and Figure 13 As shown, at least two second slots 122 are radially provided on the second mounting plate 12. The outer peripheral wall of the open retaining ring 50 extends radially away from the central axis to form a sixth engaging portion 53. During assembly, when the open retaining ring 50 is subjected to external pressure, the circumferential distance between the fourth engaging portion 51 and the fifth engaging portion 52 decreases. When the external pressure is removed, due to the elastic restoring force of the open retaining ring 50 itself, the circumferential distance between the fourth engaging portion 51 and the fifth engaging portion 52 returns to its initial state, thereby making the fourth engaging portion 51 and the fifth engaging portion 52 stably engaged in the first slot 121. At the same time, the sixth engaging portion 53 engages with the second slot 122. This not only ensures the reliability of the connection between the open retaining ring 50 and the second mounting plate 12, but also helps to simplify the processing and assembly process.

[0091] It should be noted that the laparoscopic surgical instrument of the present invention can be applied to electrocoagulation, hemostasis, tissue separation and incision, suturing and other applications of intra-abdominal lesions. Depending on the surgical application scenario, the actuator of the distal head of the laparoscopic surgical instrument of the present invention can be a clamp, a dissecting forceps, or scissors or other actuators, thereby forming various special laparoscopic minimally invasive surgical instruments with different functions. These can be adjusted according to actual needs and are not limited to the situation in this embodiment.

[0092] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A circumferential positioning structure, characterized by, include: Base (10); The rotating shaft body (20) is rotatably mounted on the base (10); the outer peripheral wall of the rotating shaft body (20) is provided with at least a portion of a first positioning corrugated portion (200) along the circumferential direction. An open retaining ring (30) is fixedly disposed on one axial side of the base (10), and the open retaining ring (30) is coaxially disposed with the rotating shaft body (20); the open retaining ring (30) is made of elastic material, and a second positioning corrugated part (300) is provided on the inner peripheral wall of the open retaining ring (30), and the second positioning corrugated part (300) is adapted to elastically interfere with the first positioning corrugated part (200); The open retaining ring (30) includes a first retaining arm (31) and a second retaining arm (32). The first retaining arm (31) and the second retaining arm (32) are arranged at a distance from each other along a first radial direction and form an adjustment notch (33). The width of the adjustment notch (33) is adapted to be adjusted according to the elastic interference between the second positioning corrugated part (300) and the first positioning corrugated part (200). The base (10) is provided with a first mounting plate (11) on the side of the open retaining ring (30) along the axial direction. The first mounting plate (11) is provided with a first limiting groove (111) and a second limiting groove (112) along the axial direction. The open retaining ring (30) is provided with a first pawl (310) and a second pawl (320) on the side of the base (10) along the axial direction. One axial end of the first claw (310) is connected to the first claw arm (31), and the other end is engaged with the first limiting groove (111); One axial end of the second claw (320) is connected to the second claw arm (32), and the other end is engaged with the second limiting groove (112).

2. The circumferential positioning structure of claim 1, wherein, The first claw (310) includes a first sliding portion (311) and a first abutting portion (312). The first sliding portion (311) is formed by the first claw arm (31) extending axially toward the base (10). The first abutting portion (312) is formed by the first sliding portion (311) extending radially away from the second claw arm (32). The first sliding portion (311) is adapted to move radially within the first limiting groove (111). The first abutting portion (312) is adapted to pass through the first limiting groove (111) axially and always abut against the side of the first mounting plate (11) axially away from the open retaining ring (30). The second claw (320) includes a second sliding portion (321) and a second abutting portion (322). The second sliding portion (321) is formed by the second claw arm (32) extending axially toward the base (10). The second abutting portion (322) is formed by the second sliding portion (321) extending radially away from the first claw arm (31). The second sliding portion (321) is adapted to move radially within the second limiting groove (112). The second abutting portion (322) is adapted to pass through the second limiting groove (112) axially and always abut against the side of the first mounting plate (11) axially away from the open retaining ring (30).

3. The circumferential positioning structure of claim 2, wherein, Before the first positioning corrugated part (200) is built into the second positioning corrugated part (300), the adjustment notch (33) closes from its natural state along the first radial direction under the action of external force until the first abutting part (312) and / or the second abutting part (322) disengage from the first mounting plate (11); After the first positioning corrugated part (200) is built into the second positioning corrugated part (300), during the process of the adjustment notch (33) closing from its natural state along the first radial direction, both the first abutting part (312) and the second abutting part (322) remain in contact with the first mounting plate (11).

4. The circumferential positioning structure according to any one of claims 1 to 3, wherein The first mounting plate (11) is also provided with a third limiting groove (113) along the axial direction. The open retaining ring (30) is also provided with a third retaining claw (330) on the side of the base (10) along the axial direction. One end of the third retaining claw (330) is connected to the first retaining arm (31) and the second retaining arm (32) at the same time, and the other end is engaged with the third limiting groove (113).

5. The circumferential positioning structure of claim 4, wherein, The third latch (330) includes a first latching portion (331), a second latching portion (332), and a third latching portion (333). The first latching portion (331) is formed by the open retaining ring (30) extending axially toward the base (10). The second latching portion (332) and the third latching portion (333) are both formed by the first latching portion (331) extending radially away from the adjustment notch (33). The first latching portion (331) is adapted to latch with the third limiting groove (113). The second latching portion (332) and the third latching portion (333) are adapted to pass through the third limiting groove (113) axially and always maintain contact with the side of the first mounting plate (11) axially away from the open retaining ring (30).

6. The circumferential positioning structure according to claim 5, characterized in that, The second snap-fit ​​portion (332) and the third snap-fit ​​portion (333) are spaced apart circumferentially to form a fourth limiting groove (34); the first mounting plate (11) is fixedly provided with a rib plate (100) on the side away from the open snap ring (30) along the axial direction, and the rib plate (100) is adapted to snap into the fourth limiting groove (34).

7. A laparoscopic surgical instrument, characterized in that, include: The laparoscopic surgical instrument body, and the circumferential positioning structure as described in any one of claims 1 to 6 above; The base (10) and the rotating shaft body (20) are rotatably connected by a bearing (40).

8. The laparoscopic surgical instrument according to claim 7, characterized in that, The bearing (40) is provided with an open retaining ring (50) on the side away from the open retaining ring (30) along the axial direction. The open retaining ring (50) is adapted to position the bearing (40) axially. The base (10) is provided with a second mounting plate (12) on the side away from the open retaining ring (30) along the axial direction. The second mounting plate (12) is engaged with the open retaining ring (50).

9. The laparoscopic surgical instrument according to claim 8, characterized in that, The second mounting plate (12) has a first slot (121) radially formed on it; the opening retaining ring (50) is made of elastic material and includes a fourth snap-fit ​​part (51) and a fifth snap-fit ​​part (52) arranged circumferentially, the fourth snap-fit ​​part (51) and the fifth snap-fit ​​part (52) being adapted to snap into the first slot (121) when the opening retaining ring (50) is subjected to pressure; The second mounting plate (12) has a second slot (122) radially provided. The outer peripheral wall of the opening retaining ring (50) extends radially away from the central axis to form a sixth engaging part (53). The sixth engaging part (53) is adapted to engage with the second slot (122).

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