Novel manual back-up device for anastomat

Abstract

The utility model relates to anastomat technical field especially a new anastomat manual back -off device, including support frame, fixed pin, gear seat, pawl, cam upper pressure block, tool withdrawal rocker and cam lower pressure block, cam upper pressure block, tool withdrawal rocker, cam lower pressure block are laid out around fixed pin, tool withdrawal rocker is matched with the poking protruding block through the sector groove, and the linear motion of gear seat is driven through the meshing tooth, when cam upper pressure block rotates, the helical surface drives lower pressure block to move down and locks and makes pawl and rack engage, and spring is in compression state. The design passes through gear engagement, pawl clutch and cam locking structure, solves the problem that the existing device is insufficient in reliability, realizes power stable transmission and accurate control, improves operation safety and convenience, is applicable to anastomat manual back -off scene.

Description

Technical Field

[0001] This utility model relates to the field of anastomosis device technology, and in particular to a novel manual retraction device for anastomosis device. Background Technology

[0002] In the field of surgical stapler technology, the manual retraction mechanism is a key component of medical staplers and serves as the last line of defense for the instrument. Its main function is to allow manual retraction of the cutting blade to its initial position when automatic firing fails or the instrument jams, thus ensuring surgical safety. However, existing manual retraction devices have certain structural design flaws, such as unstable power transmission and insufficient precision in the fit between components. These flaws necessitate improvements to the reliability and safety of the retraction operation, highlighting the urgent need for a structurally improved manual retraction device to address these issues. Utility Model Content

[0003] The present invention aims to solve the above-mentioned defects and provide a novel manual retraction device for an anastomosis device.

[0004] To overcome the defects in the background technology, the technical solution adopted by this utility model to solve its technical problem is: a novel manual retraction device for an anastomosis device, including a support frame with a fixing pin installed on it and a gear seat slidably disposed on it. The gear seat has a receiving cavity for accommodating a pawl on its side. One end of the pawl is rotatably disposed in the receiving cavity, and the other end is constructed into a hook-shaped structure. A spring piece is provided on the upper part of the hook-shaped end of the pawl, and the spring piece overlaps with the step part provided in the support frame to restrict the downward swing of the hook-shaped end of the pawl.

[0005] The cam pressure block has a fixed pin inserted through the central hole so that the cam pressure block can rotate around the fixed pin, and a toggle protrusion is provided below it.

[0006] The tool retraction rocker has a fixed pin inserted through an opening on it, and a fan-shaped groove centered on the fixed pin for accommodating a moving protrusion. When the tool retraction rocker is rotated, the inner wall of the fan-shaped groove contacts the moving protrusion and pushes the moving protrusion to move, causing the pressure block on the cam to rotate together with the tool retraction rocker. The cam has meshing teeth in a partial circumferential direction, and the gear seat has a toothed portion corresponding to the meshing teeth. The toothed portion meshes with the meshing teeth.

[0007] A cam limiting piece has a fixing pin inserted through an opening on it, and the cam limiting piece is mounted on a support frame;

[0008] A lower cam block has a fixed pin inserted through its opening, which is connected to the upper cam block. When the upper cam block rotates, the rotational movement of the upper cam block drives the lower cam block to move downward, and after the lower cam block moves downward a certain distance, the lower cam block locks with the upper cam block.

[0009] A transmission gear has a fixed pin inserted through its central hole, allowing it to rotate around the fixed pin and meshing with the rack on the side, with the pawl located above the rack;

[0010] A spring, which is sleeved on the fixing pin, is used to support the transmission gear 5 and the cam lower pressure block 4.

[0011] The fixed pin is provided with, from top to bottom, an upper cam pressure block, a retraction rocker, a cam limit plate, a lower cam pressure block, a transmission gear, and a spring.

[0012] Further improvements include the cam lower pressure block comprising a limiting plate and a cylinder vertically fixedly connected to the limiting plate. An opening is provided on the free end sidewall adjacent to the cylinder, and a spiral arc surface with a spiral structure is formed on one sidewall of the opening. The spiral arc surface extends to the free end face of the cylinder with a gradual curvature to complete the transition connection. When the cam upper pressure block is rotated, the spiral arc surface on the cylinder precisely fits with the bottom surface of the arc groove on the cam upper pressure block, thereby driving the cam lower pressure block to move downward. The inner bottom surface of the arc groove extends to the limit protrusion provided on the cam upper pressure block. When the cam upper pressure block rotates to the limit position, the limit protrusion is embedded in the locking groove constructed on the free end face of the cylinder.

[0013] Further improvements include bending a portion of the spring sheet to form a bent area, so that the bent area on the spring sheet exerts a force on the inner wall of the receiving cavity, causing the hook-shaped end of the pawl to swing downward rapidly.

[0014] Further improvements include circumferentially positioned limiting protrusions on the pressure block of the cam.

[0015] The beneficial effects of this utility model are as follows: This design adopts a special structure of upper and lower cam pressure blocks, which enables the upper cam pressure block to drive the lower cam pressure block to move when it rotates; through the meshing transmission of the meshing teeth of the retraction rocker and the gear seat tooth profile, efficient and stable power transmission is achieved, avoiding slippage or idle rotation and ensuring the reliability of manual retraction operation; the pawl cooperates with the support frame step through the spring piece, separating from the rack in the non-working state and quickly engaging during operation, effectively preventing accidental retraction caused by misoperation and improving the safety of instrument use; the upper and lower cam pressure blocks achieve precise locking through the spiral arc surface, limit protrusion, and locking groove structure, and with the spring support, ensure that the retraction stroke is controllable and the reset is convenient, improving the operating accuracy. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is an exploded view of this utility model;

[0018] Figure 2 It is the axial side of this utility model Figure 1 ;

[0019] Figure 3 It is the axial side of this utility model Figure 2 ;

[0020] Figure 4 It is the axial side of this utility model Figure 3 ;

[0021] Figure 5 This is an axial view of the pressure block on the cam in this utility model;

[0022] Figure 6 This is an axonometric view of the cam pressing block in this utility model;

[0023] Figure 7 This is a top view of the assembly of the cam pressure block and the retraction rocker in this utility model;

[0024] Figure 8 yes Figure 7 BB section view;

[0025] Figure 9 This is the main assembly view of the cam pressure block and the retracting rocker arm in this utility model;

[0026] Figure 10 This utility model is an assembly isometric. Figure 1 ;

[0027] Figure 11 This utility model is an assembly isometric. Figure 2 ;

[0028] Figure 12 yes Figure 11 Enlarged view of A in the middle;

[0029] Figure 13 This is an axonometric view of the retracting rocker arm in this utility model;

[0030] In the figure, 1-cam upper pressure block, 2-retracting rocker arm, 3-cam limit plate, 4-cam lower pressure block, 5-transmission gear, 6-spring plate, 7-pawl, 8-gear seat, 9-spring, 10-fixing pin, 11-rack, 12-support frame;

[0031] 101-Limiting protrusion, 102-Extreme protrusion, 103-Arc groove, 104-Actuating protrusion;

[0032] 201 - Meshing tooth, 202 - Sector groove;

[0033] 401-Limiting plate, 402-Cylinder body, 403-Opening, 404-Locking groove, 405-Helical arc surface;

[0034] 801 - Toothed portion, 802 - Receiving cavity

[0035] 121 - Step section. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort in accordance with the embodiments of the basic utility model are within the scope of protection of this utility model.

[0037] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 as well as Figure 13 A novel manual retraction device for a stapler includes a support frame 12 with a fixing pin 10 mounted on it and a gear seat 8 slidably disposed on it. The gear seat 8 has a receiving cavity 802 on its side for accommodating a pawl 7. One end of the pawl 7 is rotatably disposed in the receiving cavity 802, and the other end is constructed into a hook-shaped structure. A spring piece 6 is provided on the upper part of the hook-shaped end of the pawl 7, and the spring piece 6 overlaps with the step portion 121 provided in the support frame 12 to restrict the downward swing of the hook-shaped end of the pawl 7, ensuring that the pawl 7 and the rack 11 are separated in the non-working state, and that the hook teeth on the hook-shaped end of the pawl 7 mesh with the upper part of the rack 11 in the working state.

[0038] The cam pressure block 1 has a fixed pin 10 inserted through the central hole so that the cam pressure block 1 can rotate around the fixed pin 10. Below it is a toggle protrusion 104, which is used to cooperate with the retracting rocker arm 2 to realize the transmission of power.

[0039] The tool retraction rocker 2 has a fixed pin 10 inserted through an opening on it. A fan-shaped groove 202 is formed on it, centered on the fixed pin 10, to accommodate an actuating protrusion 104. The actuating protrusion 104 moves within the fan-shaped groove 202. When the tool retraction rocker 2 is rotated, the inner wall of the fan-shaped groove 202 contacts the actuating protrusion 104 and pushes the actuating protrusion 104 to move, causing the pressure block 1 on the cam to rotate together with the tool retraction rocker 2. The cam is partially provided with meshing teeth 201, and the gear seat 8 is provided with a toothed part 801 corresponding to the meshing teeth 201. The toothed part 801 meshes with the meshing teeth 201. When the tool retraction rocker 2 is rotated, the gear seat 8 moves linearly through the meshing transmission of the meshing teeth 201 and the toothed part 801, realizing the transmission of power from the tool retraction rocker 2 to the gear seat 8.

[0040] The cam limiting plate 3 has a fixing pin 10 inserted through its opening, and the cam limiting plate 3 is installed on the support frame 12. The function of the cam limiting plate 3 is to limit the rotation position of the pressure block 1 and other components on the cam. The cam limiting plate 3 enables the retracting rocker 2 to move smoothly on a plane and provides support for the retracting rocker 2.

[0041] The lower cam block 4 has a fixing pin 10 inserted through its opening, which is connected to the upper cam block 1. When the upper cam block 1 rotates, due to the connection structure design of the two, the rotational motion of the upper cam block 1 drives the lower cam block 4 to move downward. After the lower cam block 4 moves downward a certain distance, the lower cam block 4 locks with the upper cam block 1, thereby realizing a specific mechanical action.

[0042] The transmission gear 5 has a fixed pin 10 inserted in its central hole, allowing it to rotate around the fixed pin 10. It meshes with the rack 11 laterally and simultaneously with the gear connected to the motor output end. When the motor is started, the gear at the motor output end rotates, driving the transmission gear 5 to rotate through gear transmission, which in turn drives the rack 11 to move, thus realizing the power drive of the device. The pawl 7 is located above the rack 11, making it convenient for the hook-shaped end of the pawl 7 to swing down and mesh with the rack 11.

[0043] Spring 9, which is sleeved on the fixing pin 10, is used to support the transmission gear 5 and the cam lower pressure block 4 and realize the function of resetting;

[0044] The fixed pin 10 is provided with, from top to bottom, a cam upper pressure block 1, a retraction rocker 2, a cam limit plate 3, a cam lower pressure block 4, a transmission gear 5, and a spring 9.

[0045] In this embodiment, reference Figure 5 and Figure 6As shown, the cam lower pressure block 4 includes a limiting plate 401 and a cylinder 402 vertically fixed to the limiting plate 401. An opening 403 is provided on the free end sidewall adjacent to the cylinder 402. A spiral arc surface 405 with a spiral structure is formed on one sidewall of the opening 403. The spiral arc surface 405 extends to the free end face of the cylinder 402 with a gradually changing curvature to complete the transition connection. When the cam upper pressure block 1 is rotated, the spiral arc surface 405 on the cylinder 402 and the cam upper pressure block 1... The bottom surface of the upper arc groove 103 fits precisely, and the transmission characteristics of the spiral curved surface drive the lower cam pressure block 4 to move downward. The inner bottom surface of the arc groove 103 extends to the limit protrusion 102 provided on the upper cam pressure block 1. When the upper cam pressure block 1 rotates to the limit position, the limit protrusion 102 is embedded in the locking groove 404 constructed on the free end face of the cylinder 402, thereby realizing the locking of the lower cam pressure block 4 and the upper cam pressure block 1, ensuring the stability and accuracy of the entire mechanism during operation.

[0046] In this embodiment, reference Figure 1 As shown, a portion of the spring piece 6 is bent to form a bent area, which can produce elastic deformation so that the bent area on the spring piece 6 applies a stable and effective force to the inner wall of the receiving cavity 802, making it easy for the hook-shaped end of the pawl 7 to swing downward quickly.

[0047] In this embodiment, in order to limit the rotation angle of the pressure block 1 on the cam, refer to Figure 5 As shown, the cam pressure block 1 is provided with a limiting protrusion 101 in the circumferential direction. The limiting protrusion 101 provides precise mechanical feedback for the tossing stroke of the retracting rocker arm 2, ensuring the safety and controllability of the manual retraction operation.

[0048] Working principle: When manual retraction is required, the retraction rocker 2 is rotated. The retraction rocker 2 has a sector-shaped groove 202 centered on the fixing pin 10. The actuating protrusion 104 of the cam pressure block 1 is located in the sector-shaped groove 202. As the retraction rocker 2 rotates, the inner wall of the sector-shaped groove 202 contacts the actuating protrusion 104 and pushes it to move, thereby causing the cam pressure block 1 to rotate around the fixing pin 10. The sector-shaped groove 202 adjusts the range of motion of the retraction rocker 2.

[0049] At the same time, the meshing teeth 201 partially provided in the circumferential direction of the retraction rocker 2 mesh with the toothed part 801 on the gear seat 8. When the retraction rocker 2 rotates, the power is transmitted from the retraction rocker 2 to the gear seat 8 through this meshing transmission. At this time, the spring 6 disengages from the step part 121, and the end of the pawl 7 with the hook-shaped structure swings downward.

[0050] When the upper cam pressure block 1 rotates, the spiral arc surface 405 on the cylinder 402 of the lower cam pressure block 4 precisely fits with the bottom surface of the arc groove 103 on the upper cam pressure block 1. Utilizing the transmission characteristics of the spiral curved surface, the lower cam pressure block 4 is driven to move downward. When the upper cam pressure block 1 rotates to its limit position, the limit protrusion 102 on it is embedded in the locking groove 404 on the free end face of the cylinder 402, thereby locking the lower cam pressure block 4 and the upper cam pressure block 1. As the lower cam pressure block 4 moves downward, it pushes the transmission gear 5 to move together. At this time, the transmission gear 5 will disengage from the rack 11.

[0051] During the downward movement of the cam pressing block 4, it will not affect the spring 6. At this time, after the spring 6 moves a certain distance on the step 121, the spring 6 disengages from the step 121, causing the hook-shaped end of the pawl 7 to swing downward quickly and engage with the teeth above the rack 11.

[0052] Finally, when the retracting rocker 2 is moved back to its original position, it drives the gear seat 8 to move linearly. The hook teeth at one end of the pawl 7 with its hook-like structure engage with the rack 11, pushing the rack 11 to move back. When the retracting rocker 2 is moved forward, the hook teeth at one end of the pawl 7 with its hook-like structure disengage from the rack 11, causing the hook teeth at one end of the pawl 7 to move on the rack 11. By reciprocating the rotation of the retracting rocker 2, the rack 11 moves gradually, thus realizing the manual retraction function.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel manual retraction device for a stapler, characterized in that, Includes a support frame (12) on which a fixing pin (10) is installed and a gear seat (8) is slidably disposed on it. The gear seat (8) has a receiving cavity (802) on its side for accommodating a pawl (7). One end of the pawl (7) is rotatably disposed in the receiving cavity (802) and the other end is constructed into a hook-shaped structure. A spring piece (6) is provided on the upper part of the hook-shaped end of the pawl (7), and the spring piece (6) overlaps on the step (121) provided in the support frame (12) to restrict the downward swing of the hook-shaped end of the pawl (7). The cam pressure block (1) has a fixed pin (10) inserted through the central opening so that the cam pressure block (1) can rotate around the fixed pin (10), and a toggle protrusion (104) is provided below it. The tool retraction rocker (2) has a fixed pin (10) inserted through its opening. It has a fan-shaped groove (202) centered on the fixed pin (10) and used to accommodate the actuating protrusion (104). When the tool retraction rocker (2) is rotated, the inner wall of the fan-shaped groove (202) contacts the actuating protrusion (104) and pushes the actuating protrusion (104) to move, causing the pressure block (1) on the cam to rotate together with the tool retraction rocker (2). It has meshing teeth (201) in a circumferential part, and the gear seat (8) has a toothed part (801) corresponding to the meshing teeth (201). The toothed part (801) meshes with the meshing teeth (201). A cam limiting piece (3) has a fixing pin (10) inserted through its opening, and the cam limiting piece (3) is mounted on the support frame (12); The lower cam block (4) has a fixed pin (10) inserted through its opening, which is connected to the upper cam block (1). When the upper cam block (1) rotates, the rotational motion of the upper cam block (1) drives the lower cam block (4) to move downward, and after the lower cam block (4) moves downward a certain distance, the lower cam block (4) locks with the upper cam block (1). The transmission gear (5) has a fixed pin (10) inserted in its central hole, which allows it to rotate around the fixed pin (10) and meshes with the rack (11) laterally, and the pawl (7) is located above the rack (11); Spring (9), which is sleeved on the fixed pin (10), is used to support the transmission gear (5) and the cam lower pressure block (4); The fixed pin (10) is arranged from top to bottom as follows: upper cam pressure block (1), retracting rocker (2), cam limiting plate (3), lower cam pressure block (4), transmission gear (5) and spring (9).

2. The novel manual retraction device for a stapler as described in claim 1, characterized in that: The cam lower pressure block (4) includes a limiting plate (401) and a cylinder (402) vertically fixed to the limiting plate (401). An opening (403) is provided on the free end side wall adjacent to the cylinder (402). A spiral arc surface (405) with a spiral structure is formed on one side wall of the opening (403). The spiral arc surface (405) extends to the free end face of the cylinder (402) with a gradual curvature to complete the transition connection. When the cam upper pressure block (1) is rotated, The spiral arc surface (405) on the cylinder (402) precisely fits the bottom surface of the arc groove (103) on the upper cam block (1), thereby driving the lower cam block (4) to move downward. The inner bottom surface of the arc groove (103) extends to the limit protrusion (102) provided on the upper cam block (1). When the upper cam block (1) rotates to the limit position, the limit protrusion (102) is embedded in the locking groove (404) constructed on the free end face of the cylinder (402).

3. The novel manual retraction device for a stapler as described in claim 1, characterized in that: The spring piece (6) is partially bent to form a bending area, so that the bending area on the spring piece (6) applies a force to the inner wall of the receiving cavity (802), causing the end of the pawl (7) with a hook-like structure to swing downward rapidly.

4. The novel manual retraction device for a stapler as described in claim 1, characterized in that: The cam upper pressure block (1) is provided with a limiting protrusion (101) in the circumferential direction.

Images