A continuous-feed clip handle assembly for an endoscope

Abstract

The application relates to the technical field of medical devices and discloses a continuous-release clamp handle assembly for an endoscope, which comprises a sheath pipe, a gear adjusting pipe, a gear pipe, a connecting pipe, a main pipe, a pull ring and a rear ring. The sheath pipe is rotationally connected with the gear adjusting pipe. The inner side of the gear adjusting pipe is fixedly connected with a connecting sleeve used for connecting an outer pipe. The rear side of the gear adjusting pipe is provided with an elastic clamping block. The outer surface of the gear pipe is provided with a spiral ladder track. The gear adjusting pipe is arranged on the outer side of the gear pipe, and the elastic clamping block is clamped on the spiral ladder track. The gear pipe is clamped with the connecting pipe. The other side of the connecting pipe is clamped with the main pipe. The other side of the main pipe is clamped with the rear ring. The middle side wall of the main pipe is provided with a through guide groove. The pull ring is arranged on the outer side of the main pipe. The pull ring inner lining is slidably arranged in the main pipe and is clamped with the pull ring along the guide groove. The clamping device and the clamping device reset mechanism on the rear side of the clamping device are arranged in the mounting cavity of the main pipe. The inner guide rod opening and closing mechanism is arranged in the connecting pipe. The inner guide assembly is arranged in the inner cavity of the gear pipe.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a multi-shot clip handle assembly for endoscopes. Background Technology

[0002] There are two main types of hemostatic clips used in endoscopes on the market: 1) A guidewire body is pre-loaded with one split hemostatic clip, and multiple split hemostatic clips are also provided. When one of the hemostatic clips is released into the body, the guidewire needs to be pulled out of the endoscope, a new split hemostatic clip needs to be loaded, and then the endoscope needs to be reinserted. (Hereinafter referred to as "split hemostatic clip") 2) A guidewire body is pre-loaded with one split hemostatic clip, and no other split hemostatic clips are provided or can be replaced. When the hemostatic clip is released into the body, the guidewire is pulled out of the endoscope and then discarded. A new hemostatic clip is then used and reinserted into the endoscope to repeat other operations.

[0003] The two types of hemostatic clips mentioned above can only be applied once per lesion, and are classified as single-use hemostatic clips. This makes the surgical procedure cumbersome, seriously affects the efficiency of the surgery, increases the workload of medical staff, and fails to meet the needs of high efficiency, low cost, simple operation, and precise and stable surgery. Summary of the Invention

[0004] This invention provides an endoscope-mounted clip handle assembly. This handle assembly can be used to operate the continuous-fire hemostatic clips, enabling the safe, efficient, and reliable placement of the hemostatic clips from the clip module onto the lesion site in sequence. This improves surgical efficiency and convenience, reduces repetitive labor in surgical procedures, alleviates the workload of medical staff, and enhances the precision and stability of the surgery.

[0005] The above-mentioned objective of the invention is achieved through the following technical solution: An endoscope-type trigger handle assembly includes a sheath tube, a gear adjustment tube, a gear tube, a connecting tube, a main tube, a pull ring, and a rear ring. The sheath tube is rotatably engaged with the gear adjustment tube. The inner front part of the gear adjustment tube is fixedly connected along the axial direction to a connecting sleeve for connecting an outer tube. The rear side of the gear adjustment tube is provided with an elastic locking block. The outer surface of the gear tube is provided with a spiral staircase track. The gear adjustment tube is sleeved on the outside of the gear tube, and the elastic locking block is engaged with the spiral staircase track. The gear tube is engaged with the connecting tube. The other side of the connecting tube is engaged with the main tube. The other side of the main tube is engaged with the rear ring. The middle sidewall of the main tube is provided with a through guide groove along the axial direction. The pull ring is sleeved on the outside of the main tube. A pull ring liner is slidably installed inside the main tube and engaged with the pull ring along the guide groove. The inner cavity on the rear side of the main tube is provided with a convex ring. The convex ring and the rear side of the main tube form an installation cavity. The installation cavity is provided with a clamp and a clamp reset mechanism on its rear side. The clamp includes a tube body, a three-jaw clamp and a retaining ring. The three-jaw clamp is fixedly connected to the front side of the tube body, and the retaining ring is fixedly connected to the outside of the tube body. The three-jaw clamp passes forward through the convex ring and the retaining ring abuts against the convex ring. The connecting tube is provided with an inner guide rod opening and closing mechanism, which includes an opening and closing tube, an opening and closing spring, and an external threaded retaining ring. The rear end of the connecting tube is fixedly connected to a sealing plate. The sealing plate has a through hole coaxial with the connecting tube. The rear end of the opening and closing tube is provided with a radially protruding limiting ring. The limiting ring abuts against the sealing plate. The opening and closing spring is sleeved on the outside of the opening and closing tube. The external threaded retaining ring is threadedly connected to the front inner wall of the connecting tube. The gear shift tube has an inner guide assembly, which includes an inner guide cylinder, an inner guide wire clamping part, an inner guide rod, and a return spring. The inner guide cylinder is slidably disposed in the gear shift tube and the two are circumferentially fixed. The rear end of the inner guide cylinder is fixedly connected to a rear plate. The front end of the inner guide rod has a T-shaped head. The T-shaped head is located inside the inner guide cylinder and the inner guide rod passes through the rear plate. The return spring is sleeved on the outside of the inner guide rod and is located between the T-shaped head and the rear plate. The inner guide wire clamping part is screwed to the front end of the inner guide cylinder. The inner guide rod passes through the opening and closing tube, the pull ring liner, and the three-jaw clamp in sequence. The inner guide rod inside the opening and closing tube has a friction part.

[0006] The aforementioned endoscope-use trigger handle assembly includes a pull ring liner comprising a sliding sleeve, a push cylinder, and an elastic latch. The push cylinder is coaxially fixed to the front end of the sliding sleeve, and the outer diameter of the push cylinder is smaller than the inner diameter of the limiting ring. The elastic latch is disposed on the side wall of the sliding sleeve and extends out of the guide groove. The rear side of the elastic latch is provided with a forward-inclined guide surface. The inner side of the main tube is provided with a sliding groove along the axial direction. The outer side of the sliding sleeve is provided with a protrusion that matches the sliding groove along the axial direction. The rear inner cavity of the sliding sleeve is provided with a coaxial flared groove that matches the three-jaw clamp.

[0007] The aforementioned endoscope-use trigger handle assembly includes a pull ring comprising a ring cylinder and a pull ring body. The pull ring body comprises two rings symmetrically fixed to both sides of the ring cylinder. The ring cylinder has a through groove for connection with an elastic latch. A strip-shaped locking block is provided axially on the inner side of the ring cylinder. The rear end of the locking block has a locking slot. A sliding groove is formed on the outer wall of the main tube and coaxially with the guide groove. The sliding groove is adapted to the locking block. A limiting protrusion is provided on the bottom surface of the sliding groove.

[0008] In the aforementioned endoscope-use trigger handle assembly, the friction part includes a necking groove on the inner guide rod, an O-ring is fitted on the necking groove, the inner wall of the opening and closing tube is provided with a plurality of venting grooves along the circumference, the venting grooves pass through the opening and closing tube along the axial direction, and the outer edge of the O-ring abuts against the inner wall of the opening and closing tube; the necking groove includes a cylindrical part distributed from front to back and a conical part that is larger at the front and smaller at the back.

[0009] The aforementioned endoscope-use multi-shot clip handle assembly includes a clamp reset mechanism comprising a compression spring and an external threaded ring. The compression spring is sleeved on the outer side of the tube body behind the retaining ring, and the external threaded ring is screwed to the rear end of the main tube. The compression spring is located between the external threaded ring and the retaining ring.

[0010] In the aforementioned endoscope-mounted trigger handle assembly, the inner cross-section of the stop tube is polygonal, and the side wall of the inner guide tube is adapted to the inner cavity of the stop tube and can slide along the axial direction within the stop tube.

[0011] The aforementioned endoscope-mounted clip handle assembly includes a spiral staircase track comprising a radial limiting section and an axial slide rail connected in sequence, and a stop tube having a stop marking corresponding to the limiting section.

[0012] The aforementioned endoscope-use trigger handle assembly includes an internal guidewire clamping part comprising a female plug and a male plug. The female plug comprises a cylindrical housing, with a first clamping part having a C-groove fixed to its front end. An opening is provided near the first clamping part at the front end of the housing, and elastic latching parts are provided on both side walls of the housing. The male plug comprises a connecting block adapted to the inner cavity of the housing. A screw is provided at the rear end of the connecting block and screwed to the front end of the internal guide tube. A slot extending inward to accommodate the internal guidewire fixing clip is provided on one side of the connecting block. A second clamping part having a C-groove is provided at the front end of the connecting block, which aligns with the first clamping part. A latching groove adapted to the elastic latching part is provided on the side of the connecting block opposite to the slot.

[0013] The aforementioned endoscope-mounted trigger handle assembly includes a boss on the inner side of the rear wall of the sheath tube, and a convex ring on the outer side of the front wall of the gear adjustment tube that rotatably engages with the boss; a first locking protrusion on the inner side of the rear wall of the gear adjustment tube, and a first groove on the front wall of the connecting tube that matches the first locking protrusion; a second locking protrusion on the outer side of the rear wall of the connecting tube, and a second groove on the front wall of the main body tube that matches the second locking protrusion; and a third locking protrusion on the rear wall of the main body tube.

[0014] The aforementioned endoscope trigger handle assembly includes a rear ring comprising a cylindrical body, ring lugs, and a rear ring body. The ring lugs are symmetrically distributed on both sides of the cylindrical body, and the rear ring body is fixedly connected to the rear end of the cylindrical body. The front sidewall of the cylindrical body is provided with a third groove that engages with a third locking protrusion.

[0015] In summary, the beneficial technical effects of the present invention are as follows: Multiple hemostatic clips are continuously placed in the spring tube with their ends interlocking. The spring tube is inserted into the endoscope at once, and multiple hemostatic clips can be released to the lesion in sequence. The handle assembly can safely, efficiently and reliably place the hemostatic clips to the lesion in sequence, improving surgical efficiency and convenience, reducing repetitive labor in surgical operations, reducing the labor intensity of medical staff, and improving the accuracy and stability of the surgery. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an axial sectional view of the present invention; Figure 3 yes Figure 2 Enlarged view of part A; Figure 4 This is a schematic diagram of the gear adjustment tube of the present invention; Figure 5 This is a schematic diagram of the structure of the gear tube of the present invention; Figure 6 This is a schematic diagram of the connecting pipe of the present invention; Figure 7 This is a schematic diagram of the opening and closing tube of the present invention; Figure 8 This is a schematic diagram of the structure of the main tube of the present invention; Figure 9 This is a schematic diagram of the structure of the clamp of the present invention; Figure 10 This is a schematic diagram of the structure of the pull ring liner of the present invention; Figure 11 This is a schematic diagram of the pull ring structure of the present invention; Figure 12 This is an exploded structural diagram of the internal guide component of the present invention.

[0017] The diagram shows: 100, sheath tube; 101, boss; 200, gear adjustment tube; 201, connecting sleeve; 202, elastic locking block; 203, convex ring; 300, gear tube; 301, spiral staircase track; 3011, limiting section; 3012, slide rail; 3013, gear indicator; 3014, forward / backward groove; 302, first locking protrusion; 400, connecting tube; 401, sealing plate; 4011, through hole; 402, first groove. ; 403, Second locking protrusion; 500, Main tube; 501, Guide groove; 502, Protruding ring; 503, Mounting cavity; 504, Sliding groove; 505, Second groove opening; 506, Third locking protrusion; 507, Sliding groove; 508, Limiting protrusion; 510, Clamp; 5101, Tube body; 5102, Three-jaw clamp; 5103, Retaining ring; 520, Clamp reset mechanism; 5201, Compression spring; 5202, External threaded ring; 600. Pull ring; 601. Ring cylinder; 6011. Through groove; 6012. Locking block; 6013. Snap-on groove; 602. Pull ring body; 700. Rear ring; 701. Cylinder body; 7011. Third groove; 702. Ring lug; 703. Rear ring body; 800. Pull ring liner; 801. Sliding sleeve; 8011. Trumpet-shaped groove; 8012. Protrusion; 802. Push cylinder; 803. Elastic latch; 8031. Guide surface; 900. Inner guide rod opening and closing mechanism; 901. Opening and closing tube; 9011. Limiting ring; 9012. Exhaust groove; 902. Opening and closing spring; 903. External threaded retaining ring. <code> 910. Internal guide components;< / code> 911. Inner guide tube; 9111. Rear plate; 912. Inner guide wire clamping part; 9121. Female plug; 9122. Housing; 9123. First clamping part; 9124. Elastic snap-fit ​​part; 9125. Male plug; 9126. Connecting block; 9127. Screw; 9128. Slot; 9129. Second clamping part; 913. Inner guide rod; 9131. T-shaped head; 914. Return spring; 915. Friction part; 9151. Necking groove; 9152. O-ring; 9153. Column part; 9154. Conical part; a. Outer tube; b. Inner guide wire; c. Inner guide wire fixing clamp. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1-12 The present invention will be described in further detail.

[0019] like Figure 1-12As shown, an endoscope-grade trigger handle assembly includes a sheath tube 100, a gear adjustment tube 200, a gear tube 300, a connecting tube 400, a main tube 500, a pull ring 600, and a rear ring 700. The sheath tube 100 is rotatably engaged with the gear adjustment tube 200. The inner front part of the gear adjustment tube 200 is fixedly connected along the axial direction to a connecting sleeve 201 for connecting an outer tube a. An elastic locking block 202 is provided on the rear side of the gear adjustment tube 200. A spiral staircase track 301 is provided on the outer surface of the gear tube 300 for gear adjustment. Pipe 200 is sleeved on the outside of the stop pipe 300 and elastic locking block 202 is locked on the spiral stair rail 301. The rear side of the stop pipe 300 is locked with the connecting pipe 400, the rear side of the connecting pipe 400 is locked with the front side of the main pipe 500, and the rear side of the main pipe 500 is locked with the rear ring 700. The middle side wall of the main pipe 500 is provided with a through guide groove 501 along the axial direction. Pull ring 600 is sleeved on the outside of the main pipe 500. Pull ring liner 800 is slidably installed inside the main pipe 500 and is locked with pull ring 600 along the guide groove 501.

[0020] The inner side of the rear wall of the sheath tube 100 is provided with a boss 101, and the outer side of the front wall of the gear adjustment tube 200 is provided with a protruding ring 203 that is rotatably engaged with the boss 101; the inner side of the rear wall of the gear tube 300 is provided with a first locking protrusion 302, and the front wall of the connecting tube 400 is provided with a first groove 402 that is adapted to the first locking protrusion 302; the outer side of the rear wall of the connecting tube 400 is provided with a second locking protrusion 403, and the front wall of the main tube 500 is provided with a second groove 505 that is adapted to the second locking protrusion 403; the rear wall of the main tube 500 is provided with a third locking protrusion 506.

[0021] like Figure 1 As shown, the rear ring 700 includes a cylindrical body 701, a ring lug 702 and a rear ring body 703. The ring lug 702 is symmetrically distributed on both sides of the cylindrical body 701. The rear ring body 703 is fixedly connected to the rear end of the cylindrical body 701. The front side wall of the cylindrical body 701 is provided with a third slot 7011 that is adapted to the third latch 506.

[0022] like Figure 5 As shown, the spiral staircase track 301 includes a radially connected limiting section 3011 and an axially connected slide rail 3012. The stop tube 300 is provided with a stop mark 3013 corresponding to the limiting section 3011. The limiting section 3011 is used to switch stops, the length of the slide rail 3012 is used to limit the extension stroke of the hemostatic clip, and the stop mark 3013 can display the total number of pre-installed hemostatic clips and the number of hemostatic clips currently in use.

[0023] like Figure 1 As shown, in one embodiment, the limiting section 3011 at the end of the spiral track 301 on the gear tube 300 is provided with an inlet / outlet groove 3014 extending along the axial direction of the gear tube 300. The inlet / outlet groove 3014 is distributed on the front and rear sides of the end limiting section 3011, and the inlet / outlet groove 3014 can retract the exposed release clamp into the outer tube.

[0024] like Figure 2 , 12 As shown, the inner cavity of the gear position tube 300 is provided with an inner guide assembly 910. The inner guide assembly 910 includes an inner guide cylinder 911, an inner guide wire clamping part 912, an inner guide rod 913, and a return spring 914. The inner guide cylinder 911 is slidably disposed within the gear position tube 300 and the two are circumferentially fixed relative to each other. The rear end of the inner guide cylinder 911 is fixedly connected to a rear plate 9111. The rear plate 9111 has a through hole in the center. The front end of the inner guide rod 913 has a T-shaped head 9131. The T-shaped head 9131 is located inside the inner guide cylinder 911 and the inner guide rod 914 is fixed to the inner guide cylinder 911. 3. The rear plate 9111 is inserted backward. The return spring 914 is sleeved on the outside of the inner guide rod 913 and located between the T-shaped head 9131 and the rear plate 9111. The inner guide wire clamping part 912 is used to clamp the inner guide wire b extending backward from the tail of the outer tube a. The inner guide wire clamping part 912 is screwed to the front end of the inner guide tube 911. The inner guide rod 913 passes backward through the opening and closing tube 901, the pull ring liner 800 and the three-jaw clamp 5102 in sequence. The inner guide rod 913 in the opening and closing tube 901 is provided with a friction part 915.

[0025] like Figure 2 , 12 As shown, the outer tube a is sleeved on the outside of the inner guide wire b, and the tail of the outer tube a is embedded in the connecting sleeve 201. When the sheath tube 100 and the gear adjustment tube 200 rotate relative to each other, the gear adjustment tube 200 drives the gear tube 300 to rotate synchronously, and the gear tube 300 drives the inner guide tube 911 to rotate synchronously. Finally, the inner guide wire b on the inner guide wire clamping part 912 rotates relative to the outer tube a, thereby controlling the rotation of the opened hemostatic clamp and realizing the adjustment and control of the angle and orientation of the hemostatic clamp relative to the lesion site.

[0026] like Figure 5 , 12 As shown, in order to ensure that the inner guide assembly 910 can rotate synchronously when the gear tube 300 is rotated, so as to realize the rotation of the inner guide wire b, in one embodiment, the inner cavity cross section of the gear tube 300 is polygonal, and the side wall of the inner guide cylinder 911 is adapted to the inner cavity of the gear tube 300 and can slide along the axial direction inside the gear tube 300.

[0027] The preload A of the return spring 914 must be greater than the locking force B when the hemostatic clip holds the tissue and less than the pull-out force C between the hemostatic clips in the clip module.

[0028] like Figure 2 , 3As shown in Figure 6, the connecting pipe 400 is provided with an inner guide rod opening and closing mechanism 900. The inner guide rod opening and closing mechanism 900 includes an opening and closing pipe 901, an opening and closing spring 902, and an external threaded retaining ring 903. The rear end of the connecting pipe 400 is fixedly connected to a sealing plate 401. The sealing plate 401 has a through hole 4011 coaxial with the connecting pipe 400. The rear end of the opening and closing pipe 901 has a radially protruding limiting ring 9011. The outer diameter of the limiting ring 9011 is adapted to the inner diameter of the connecting pipe 400. The limiting ring 9011 and the sealing plate 401 are connected. Plate 401 abuts against the opening and closing spring 902, which is sleeved on the outside of the opening and closing tube 901. The inner wall of the front side of the connecting tube 400 is provided with an internal thread that is screwed into the external threaded retaining ring 903. The opening and closing spring 902 abuts against the limiting ring 9011 and the external threaded retaining ring 903 respectively. The outer diameter of the opening and closing tube 901 is smaller than the inner diameter of the external threaded retaining ring 903, thereby ensuring that the limiting ring 9011 on the opening and closing tube 901 can slide back and forth in the connecting tube 400, avoiding interference of the external threaded retaining ring 903 with the opening and closing tube 901.

[0029] like Figure 3 , 7 As shown, the friction part 915 in this embodiment includes a necking groove 9151 opened on the inner guide rod 913, an O-ring rubber ring 9152 is sleeved on the necking groove 9151, and a plurality of exhaust grooves 9012 are provided on the inner wall of the opening and closing tube 901 along the circumferential direction. The exhaust grooves 9012 penetrate the opening and closing tube 901 along the axial direction of the opening and closing tube 901. The outer edge of the O-ring rubber ring 9152 abuts against the inner wall of the opening and closing tube 901 to generate frictional force D. The necking groove 9151 includes a columnar part 9153 distributed from front to back and a conical part 9154 that is larger at the front and smaller at the back. The O-ring rubber ring 9152 can slide on the necking groove 9151.

[0030] When the O-ring 9152 on the inner guide rod 913 moves axially within the opening and closing tube 901, the gas in the inner guide rod opening and closing mechanism 900 can flow through the O-ring 9152 via the exhaust groove 9012, ensuring the smooth movement of the inner guide rod 913.

[0031] like Figure 3 As shown, the constriction groove 9151 includes a cylindrical portion 9153 and a tapered portion 9154, which is larger at the front and smaller at the back, distributed from front to back. When the opening and closing tube 901 moves forward, it pushes the O-ring 9152 onto the cylindrical portion 9153. At this time, the frictional force generated between the opening and closing tube 901 and the O-ring 9152 is D1. When the opening and closing tube 901 returns to its original position under the action of the opening and closing spring 902, it pushes the O-ring 9152 onto the tapered portion 9154. At this time, the frictional force generated between the opening and closing tube 901 and the O-ring 9152 is D2. The relationship between the frictional forces D1 and D2 and the frictional force E between the clip module and the outer tube is D1 > E > D2. To ensure that the hemostatic clip is not pushed out of the outer tube head during the clip pushing process, the frictional force D1 must be less than the force F that pushes the hemostatic clip out of the outer tube head.

[0032] During use, when the opening and closing tube 901 moves axially forward, the frictional force D1 generated by the opening and closing tube 901 and the O-ring 9152 is greater than the frictional force E of the clamp module in the outer tube, thus pushing the hemostatic clip in the clamp module open. When the opening and closing tube 901 is reset by the elastic force of the opening and closing spring 902, the frictional force D2 generated by the opening and closing tube 901 and the O-ring 9152 is less than the frictional force E of the clamp module in the outer tube. Therefore, the opening and closing tube 901 will not drive the clamp module to move when resetting. This design is to ensure that the hemostatic clip in the clamp module can be pushed open when the opening and closing tube 901 moves forward, but will not cause the hemostatic clip to close when the opening and closing tube 901 resets, and will not push the hemostatic clip out of the outer tube head.

[0033] like Figure 3 , 8 As shown in Figure 9, the inner cavity on the rear side of the main tube 500 is provided with a convex ring 502 perpendicular to its axis. The convex ring 502 and the rear side of the main tube 500 form an installation cavity 503. The installation cavity 503 is provided with a clamp 510 and a clamp reset mechanism 520 on its rear side. The clamp 510 includes a tube body 5101, a three-jaw clamp 5102 and a retaining ring 5103. The three-jaw clamp 5102 is fixedly connected to the front side of the tube body 5101, and the retaining ring 5103 is fixedly connected to the outside of the tube body 5101. The three-jaw clamp 5102 passes forward through the convex ring 502 and the retaining ring 5103 abuts against the convex ring 502.

[0034] like Figure 2 , 3 As shown, the clamp reset mechanism 520 includes a compression spring 5201 and an external threaded ring 5202. The compression spring 5201 is sleeved on the outside of the tube body 5101 behind the retaining ring 5103. The inner wall of the main tube 500 at the rear end of the mounting cavity 503 is provided with an internal thread. The external threaded ring 5202 is screwed to the rear end of the main tube 500. The compression spring 5201 is located between the external threaded ring 5202 and the retaining ring 5103.

[0035] like Figure 3 , 10 As shown, the pull ring liner 800 includes a sliding sleeve 801, a push cylinder 802, and an elastic latch 803. The push cylinder 802 is coaxially fixed to the front end of the sliding sleeve 801. The outer diameter of the push cylinder 802 is smaller than the inner diameter of the limiting ring 9011. The elastic latch 803 is provided on the side wall of the sliding sleeve 801 and extends out of the guide groove 501. The rear side of the elastic latch 803 is provided with a forward-inclined guide surface 8031. The inner side of the main tube 500 is provided with a sliding groove 504 along the axial direction. The outer side of the sliding sleeve 801 is provided with a protrusion 8012 that matches the sliding groove 504 along the axial direction. The inner cavity of the rear side of the sliding sleeve 801 is provided with a coaxial trumpet-shaped slot 8011, which matches the three-jaw clamp 5102.

[0036] like Figure 8 , 11As shown, the pull ring 600 includes a ring cylinder 601 and a pull ring body 602. The pull ring body 602 includes two rings symmetrically fixed to both sides of the ring cylinder 601. The ring cylinder 601 is provided with a through groove 6011 that is snapped into place by an elastic latch 803. A strip-shaped latch 6012 is provided axially on the inner side of the ring cylinder 601. The rear end of the latch 6012 is provided with a latching slot 6013. A sliding groove 507 is provided on the outer wall of the main tube 500 and coaxially with the guide groove 501. The sliding groove 507 is adapted to the latch 6012. A limiting protrusion 508 is provided on the bottom surface of the sliding groove 507.

[0037] When the pull ring 600 is pulled backward, the pull ring 600 drives the pull ring liner 800, which is engaged with it, to slide backward in sync. When the snap-fit ​​groove 6013 of the pull ring 600 is engaged with the limiting protrusion 508 on the main tube 500, a "click" sound will be made, indicating to the operator that the pull ring liner 800 has moved into place.

[0038] like Figure 3 As shown, during use, by pulling the pull ring 600 backward, the pull ring 600 moves the inner liner 800 backward. Simultaneously, the trumpet-shaped slot 8011 of the rear inner cavity of the sliding sleeve 801 radially compresses the three-jaw clamp 5102 of the clamp 510. The three-jaw clamp 5102 clamps the tail of the inner guide rod 913. During clamping, initially, the clamp 510 remains stationary under the support of the spring force of the compression spring 5201. When the backward pulling force of the pull ring 600 exceeds the spring force of the compression spring 5201, the clamp 510 retracts into the mounting cavity 503, and the inner guide rod 913 also moves backward, thereby moving the inner guide wire b backward, achieving the clamping of the hemostatic clip onto the tissue. Therefore, the locking force G of the three-jaw clamp 5102 on the inner guide rod 913 must be greater than the locking force B of the hemostatic clip when the clamp locks the tissue, and greater than the force F that pushes the hemostatic clip out of the outer tube head.

[0039] During the process of the pull ring 600 pulling the inner guide rod 913 backward, the return spring 914 may be further compressed. At this time, the pressure A of the return spring 914 will increase. However, the maximum pressure Amax that the return spring 914 can generate is still less than the pull-out force C between the hemostatic clips. This is to ensure that the hemostatic clips will not be pulled out when locking the tissue.

[0040] To improve the clamping effect of the inner guide rod 913, a soft silicone layer is coated on the rear end of the inner guide rod 913 to increase the clamping force of the three-jaw clamp 5102.

[0041] like Figure 12As shown, the inner guide wire clamping part 912 includes a female plug 9121 and a male plug 9125. The female plug 9121 includes a cylindrical housing 9122. The front end of the housing 9122 is fixedly connected to a first clamping part 9123 with a C-shaped groove. The front end of the housing 9122 has an opening near the first clamping part 9123. The two side walls of the housing 9122 are respectively provided with elastic latching parts 9124. The male plug 9125 includes a connecting block 9126 adapted to the inner cavity of the housing 9122. The rear end of the connecting block 9126 is provided with a connection to the front of the inner guide tube 911. The screw 9127 is screwed to the end. The connecting block 9126 has an inwardly extending slot 9128 on one side for accommodating the inner guide wire fixing clip b. The front end of the connecting block 9126 has a second clamping part 9129 with a C-shaped groove that passes through the front opening of the housing 9122 and is combined with the first clamping part 9123. The C-shaped groove is used to clamp the inner guide wire b. The side of the connecting block 9126 opposite to the slot 9128 has a snap-fit ​​groove that is adapted to the elastic snap-fit ​​part 9124, thereby realizing the snap-fit ​​connection of the female plug 9121 and the male plug 9125.

[0042] The operation steps of the handle assembly are as follows: Push the pull ring 600 forward. The pull ring 600 drives the push cylinder 802 on the inner liner 800 of the pull ring to push the opening and closing tube 901 to move forward against the elastic force of the opening and closing spring 902. During the forward movement of the opening and closing tube 901, it drives the inner guide rod 913 to move forward through friction with the O-ring rubber ring 9152, and drives the inner guide assembly 910 to move forward as a whole. The inner guide assembly 910 then drives the inner guide wire b to move forward in the outer tube a, thereby realizing the opening of the hemostatic clamp.

[0043] After the hemostatic clamp opens, the pull ring 600 is released, and the opening and closing tube 901 is reset under the action of the opening and closing spring 902. At the same time, the pull ring 600 is reset. At this time, the hemostatic clamp is still in the open state. At this time, the left hand holds the sheath tube 100, and the right hand rotates the main body tube 500. The main body tube 500 drives the stop tube 300 to rotate, and the stop tube 300 drives the inner guide component 910 to rotate, thereby realizing the rotation of the hemostatic clamp.

[0044] After the hemostatic clamp is rotated and positioned, pull the pull ring 600 backward. The pull ring 600 drives the inner liner 800 to move backward. During the movement, the trumpet-shaped groove 8011 on the rear side of the inner liner 800 radially compresses the three-jaw clamp 5102 until it clamps the inner guide rod 913. At this time, the pull ring 600, the inner guide rod 913 and the clamp 510 are integrated. During the process of the clamp 510 clamping the inner guide rod 913, the inner guide rod 913 will not move relative to the main tube 500, so the hemostatic clamp remains open.

[0045] Continue pulling the pull ring 600 backward. The pull ring 600 moves the inner guide wire b on the inner guide assembly 910 backward, locking the hemostatic clip. During this process, the inner clamp 510 will compress the compression spring 5201. Since the backward pull of the pull ring 600 on the inner guide rod 913 is much greater than the locking stroke of the hemostatic clip, when the hemostatic clip is locked and the pull ring 600 is pulled backward continuously, the return spring 914 on the inner guide assembly 910 is compressed, causing the inner guide rod 913 to disengage from the inner guide wire clamping part 912. The inner guide rod 913 continues to move to the bottom with the pull ring 600, while the position of the inner guide wire b remains unchanged.

[0046] The maximum elastic force generated during the compression of the return spring 914 must be less than the pull-out force C between the hemostatic clips to prevent the clip modules from being unable to be pulled apart and causing damage.

[0047] After the hemostatic clip is locked, release the pull ring 600. At this time, the pull ring 600 returns to its original position under the action of the spring 5201, but the inner liner 800 and the clamp 510 will not be released, and the inner guide rod 913 remains locked. At this time, rotating relative to the gear adjustment tube 200 pushes the gear tube 300 to change gears, releasing the current hemostatic clip in the clip module and pushing out the next hemostatic clip. After the instrument has changed gears, push the pull ring 600 forward to separate the inner liner 800 and the inner clamp 510, thus reaching the initial state of the instrument.

[0048] After all hemostatic clips have been released, the release clip will extend out of the outer tube head, move the gear adjustment tube 200 along the infeed / retract groove 3014 of the gear tube 300, and retract the release clip into the outer tube. Then, the handle assembly will be withdrawn from the instrument channel. At this point, all the procedures for using the instrument are complete.

[0049] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An endoscope-mounted trigger handle assembly, characterized in that, The device includes a sheath tube, a gear adjustment tube, a gear tube, a connecting tube, a main tube, a pull ring, and a rear ring. The sheath tube is rotatably engaged with the gear adjustment tube. The inner front part of the gear adjustment tube is fixedly connected along the axial direction to a connecting sleeve for connecting to an outer tube. The rear side of the gear adjustment tube is provided with an elastic locking block. The outer surface of the gear tube is provided with a spiral staircase track. The gear adjustment tube is sleeved on the outside of the gear tube, and the elastic locking block is engaged with the spiral staircase track. The gear tube is engaged with the connecting tube. The other side of the connecting tube is engaged with the main tube. The other side of the main tube is engaged with the rear ring. The middle sidewall of the main tube is provided with a through guide groove along the axial direction. The pull ring is sleeved on the outside of the main tube. A pull ring liner is slidably installed inside the main tube and engaged with the pull ring along the guide groove. The inner cavity on the rear side of the main tube is provided with a convex ring. The convex ring and the rear side of the main tube form an installation cavity. The installation cavity is provided with a clamp and a clamp reset mechanism on its rear side. The clamp includes a tube body, a three-jaw clamp and a retaining ring. The three-jaw clamp is fixedly connected to the front side of the tube body, and the retaining ring is fixedly connected to the outside of the tube body. The three-jaw clamp passes forward through the convex ring and the retaining ring abuts against the convex ring. The connecting tube is provided with an inner guide rod opening and closing mechanism, which includes an opening and closing tube, an opening and closing spring, and an external threaded retaining ring. The rear end of the connecting tube is fixedly connected to a sealing plate. The sealing plate has a through hole coaxial with the connecting tube. The rear end of the opening and closing tube is provided with a radially protruding limiting ring. The limiting ring abuts against the sealing plate. The opening and closing spring is sleeved on the outside of the opening and closing tube. The external threaded retaining ring is threadedly connected to the front inner wall of the connecting tube. The gear shift tube has an inner guide assembly, which includes an inner guide cylinder, an inner guide wire clamping part, an inner guide rod, and a return spring. The inner guide cylinder is slidably disposed in the gear shift tube and the two are circumferentially fixed. The rear end of the inner guide cylinder is fixedly connected to a rear plate. The front end of the inner guide rod has a T-shaped head. The T-shaped head is located inside the inner guide cylinder and the inner guide rod passes through the rear plate. The return spring is sleeved on the outside of the inner guide rod and is located between the T-shaped head and the rear plate. The inner guide wire clamping part is screwed to the front end of the inner guide cylinder. The inner guide rod passes through the opening and closing tube, the pull ring liner, and the three-jaw clamp in sequence. The inner guide rod inside the opening and closing tube has a friction part.

2. The endoscope trigger clip handle assembly according to claim 1, characterized in that, The pull ring liner includes a sliding sleeve, a push cylinder, and an elastic latch. The push cylinder is coaxially fixed to the front end of the sliding sleeve. The outer diameter of the push cylinder is smaller than the inner diameter of the limiting ring. The elastic latch is disposed on the side wall of the sliding sleeve and extends out of the guide groove. The rear side of the elastic latch is provided with a forward-inclined guide surface. The inner side of the main tube is provided with a sliding groove along the axial direction. The outer side of the sliding sleeve is provided with a protrusion that matches the sliding groove along the axial direction. The inner cavity of the rear side of the sliding sleeve is provided with a coaxial trumpet-shaped slot, which matches the three-jaw clamp.

3. The endoscope trigger clip handle assembly according to claim 2, characterized in that, The pull ring includes a ring cylinder and a pull ring body. The pull ring body includes two rings that are symmetrically fixed to both sides of the ring cylinder. The ring cylinder is provided with a through groove that is connected to the elastic latch for snapping. The inner side of the ring cylinder is provided with a strip-shaped locking block along the axial direction. The rear end of the locking block is provided with a snapping groove. The outer wall of the main tube is provided with a sliding groove that is coaxial with the guide groove. The sliding groove is adapted to the locking block. The bottom surface of the sliding groove is provided with a limiting protrusion.

4. The endoscope trigger clip handle assembly according to claim 1, characterized in that, The friction part includes a necking groove on the inner guide rod, an O-ring is fitted on the necking groove, and the inner wall of the opening and closing tube is provided with a plurality of venting grooves along the circumference. The venting grooves pass through the opening and closing tube along the axial direction, and the outer edge of the O-ring abuts against the inner wall of the opening and closing tube. The necking groove includes a cylindrical part and a tapered part that is larger at the front and smaller at the back, distributed from front to back.

5. The endoscope trigger clip handle assembly according to claim 1, characterized in that, The clamp reset mechanism includes a compression spring and an external threaded ring. The compression spring is sleeved on the outside of the tube body behind the retaining ring. The external threaded ring is screwed to the rear end of the main tube. The compression spring is located between the external threaded ring and the retaining ring.

6. The endoscope trigger clip handle assembly according to claim 1, characterized in that, The inner cavity of the gear shift tube has a polygonal cross-section, and the side wall of the inner guide cylinder is adapted to the inner cavity of the gear shift tube and can slide along the axial direction inside the gear shift tube.

7. The endoscope trigger clip handle assembly according to claim 1, characterized in that, The spiral staircase track includes a radial limiting section and an axial slide rail connected in sequence, and the stop tube is provided with a stop mark corresponding to the limiting section.

8. The endoscope trigger clip handle assembly according to claim 1, characterized in that, The inner guide wire clamping part includes a female plug and a male plug. The female plug includes a cylindrical housing. A first clamping part with a C-shaped groove is fixed to the front end of the housing. An opening is provided near the first clamping part at the front end of the housing. Elastic snap-fit ​​parts are provided on both side walls of the housing. The male plug includes a connecting block adapted to the inner cavity of the housing. A screw is provided at the rear end of the connecting block and screwed to the front end of the inner guide tube. A slot extending inward to accommodate the inner guide wire fixing clamp is provided on one side of the connecting block. A second clamping part with a C-shaped groove is provided at the front end of the connecting block and aligns with the first clamping part. A snap-fit ​​groove adapted to the elastic snap-fit ​​part is provided on the side of the connecting block opposite to the slot.

9. The endoscope trigger clip handle assembly according to claim 1, characterized in that, The inner side of the rear wall of the sheath tube is provided with a boss, and the outer side of the front wall of the gear adjustment tube is provided with a convex ring that rotates and engages with the boss; the inner side of the rear wall of the gear adjustment tube is provided with a first locking protrusion, and the front wall of the connecting tube is provided with a first groove that matches the first locking protrusion; the outer side of the rear wall of the connecting tube is provided with a second locking protrusion, and the front wall of the main tube is provided with a second groove that matches the second locking protrusion; the rear wall of the main tube is provided with a third locking protrusion.

10. The endoscope trigger clip handle assembly according to claim 9, characterized in that, The rear ring includes a cylinder, ring ears, and a rear ring body. The ring ears are symmetrically distributed on both sides of the cylinder, and the rear ring body is fixedly connected to the rear end of the cylinder. The front side wall of the cylinder is provided with a third groove that cooperates with a third locking protrusion.

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