A push type secondary firing prevention safety mechanism of a linear cutting stapler

Abstract

The present application relates to a kind of secondarily fired prevention mechanism of endoscopic linear cutting anastomat, it is characterized in that, including the firing block being arranged in cartridge holder and cutting knife assembly, the cutting knife assembly includes cutting knife and the pusher bar of driving cutting knife movement, it is characterized in that, the cartridge holder is rotatably connected with safety assembly in, and safety assembly is connected with cartridge holder inner wall by elastic element;Its elastic drive safety assembly one end lock block rotates to be connected with the locking portion being arranged on cutting knife, limit cutting knife to cutting direction movement, realize locking.By firing block release safety block, only in the anastomat after use safety block is released, cutting knife is limited, i.e. guarantee cartridge normal firing, can also prevent repeated firing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a dial type secondary firing prevention safety mechanism of a linear cutting stapler. BACKGROUND

[0002] The linear cutting stapler is one of the instruments widely used in minimally invasive surgery, which is mainly used for tissue resection, transection and anastomosis in open surgery. The existing stapler usually only has a safety mechanism on the driving mechanism to prevent the medical staff from misoperating and causing premature firing. After firing, the knife is reset, and then the stapler is withdrawn. In this process, if the medical staff misjudges that the stapler is in an unfired state and starts the firing operation again, the knife assembly will cut the already cut tissue again, causing a serious medical accident. In addition, when there is no staple cartridge and firing block in the staple cartridge holder, the knife will still be pushed out by the knife pushing rod, which may also cause an accident. Therefore, a secondary firing prevention safety mechanism needs to be designed to solve the problems existing in the prior art. SUMMARY

[0003] The purpose of the present application is to provide a dial type secondary firing prevention safety mechanism of a linear cutting stapler to solve the problem of medical accidents caused by misjudging that the staple cartridge has not been fired and secondary firing.

[0004] The technical solution of the present application is: a dial type secondary firing prevention safety mechanism of a linear cutting stapler, characterized in that a firing block and a knife assembly are arranged in a staple cartridge holder, the knife assembly comprises a knife and a knife pushing rod for driving the knife to move, and characterized in that an insurance assembly is rotatably connected in the staple cartridge holder, and the insurance assembly is connected with the inner wall of the staple cartridge holder through an elastic element; one end of the elastic drive insurance assembly is rotatably connected with a locking block provided on the knife, which limits the movement of the knife in the cutting direction and realizes locking;

[0005] The other end of the insurance assembly away from the locking block is provided with a guide part connected with an unlocking part provided on the firing block, the unlocking part pushes the guide part, so that the insurance assembly rotates to make the locking block away from the locking part;

[0006] The insurance assembly further comprises a first dial and a second dial which are rotatably driven, the locking block is connected with the second dial, and the guide part is connected with the first dial.

[0007] Preferably, the first dial is further provided with a first dial lever, the second dial is provided with a second dial lever connected with the first dial lever, and the first dial lever and the second dial lever are dialled with each other to relatively rotate the second dial and the first dial.

[0008] Preferably, the second dial is provided with a first connecting block and a second connecting block in sequence away from one end of the second dial lever, the lock block is arranged on the second connecting block close to one side of the cutter, and the elastic element is arranged on the second connecting block away from the lock block.

[0009] Preferably, the guide part is connected with the first dial away from one end of the first dial lever, the first inclined surface is arranged on the guide part, and the unlocking part is opposite to the first inclined surface, so that the first dial rotates.

[0010] Preferably, the nail cartridge frame is further provided with a stress block connected with the first connecting block, the stress block is arranged on the opposite side of the elastic element, and the position of the first connecting block is limited to limit the stroke of the safety assembly.

[0011] Preferably, the lock block is provided with a second inclined surface, the cutter is reversely movable and can be slidably connected with the second inclined surface, and the second inclined surface can be arc-shaped.

[0012] Preferably, the locking part is a limiting hole arranged on the cutter.

[0013] Preferably, the safety assembly and the stress block are symmetrically designed and arranged on both sides of the cutter.

[0014] Compared with the prior art, the application has the following advantages:

[0015] (1) The safety block is released by the firing block, and the safety block is released only after the anastomat is used, so that the cutter is limited, that is, the normal firing of the nail cartridge is ensured, and repeated firing is prevented.

[0016] (2) When there is no firing block in the nail cartridge frame, the cutter can be in the safety state, and the accidental accidents caused by the cutter being pushed out when the nail cartridge frame is idle are also avoided

[0017] (3) The application has simple structure and convenient use, greatly improves the safety factor of the anastomat in use, and ensures the medical safety. BRIEF DESCRIPTION OF DRAWINGS

[0018] The application will be further described below in combination with the drawings and embodiments:

[0019] Figure 1 The application is a structure diagram of the anastomat in a closed state of the safety mechanism for preventing secondary firing.

[0020] Figure 2 The application is a structure diagram of the anastomat in an open state of the safety mechanism for preventing secondary firing.

[0021] Figure 3 The application is a structure diagram of the locking assembly when being unlocked.

[0022] Figure 4 As Figure 3 the structure diagram of the structure enlarged at C in the figure;

[0023] Figure 5 As Figure 1 the structure diagram of the structure enlarged at C in the figure;

[0024] Figure 6 As Figure 5 the structure diagram of the structure enlarged at C in the figure

[0025] Figure 7 As Figure 2 the structure diagram of the structure enlarged at C in the figure;

[0026] Figure 8 As the structure diagram of the structure enlarged at C in the figure

[0027] Figure 9 As the structure diagram of the structure enlarged at C in the figure

[0028] Figure 10 As the structure diagram of the structure enlarged at C in the figure DETAILED DESCRIPTION

[0029] The content of the application will be further described in detail below in combination with specific embodiments:

[0030] As Figures 1-2 shown, the stapler for preventing secondary firing safety mechanism includes a cartridge assembly, and a driving end (not shown in the figure) connected with the cartridge assembly through an adapter 7.

[0031] The cartridge assembly includes a cartridge frame 1 and an anvil 2 rotationally connected with the cartridge frame 1, and the cartridge frame 1 and the anvil 2 have at least an open and closed state. The cartridge frame 1 is provided with a cutter assembly 3 and a cartridge 4, and the bottom of the cartridge 4 is provided with a firing block 5 in cooperation. The cutter assembly 3 includes a cutter 31 and a pusher rod 32 fixedly connected with the cutter 31, and the end of the pusher rod 32 away from the cutter 31 is connected with the driving end through the adapter. During suturing, the cartridge frame 1 and the anvil 2 are closed, the driving end drives the cutter 32 to move forward through the pusher rod 32, and then the cutter 32 drives the firing block 5 to move forward, the firing block 5 fires the suturing needle of the cartridge 4, the fired suturing needle cooperates with the needle groove 21 provided on the lower surface of the anvil 2 to realize tissue suturing; the cutter 31 moves forward at the same time to cut the tissue; after the suturing and cutting are completed, the driving end drives the cutter 31 to move reversely to the initial position through the pusher rod 32, the cartridge frame 1 and the anvil 2 are opened, and the stapler can be taken out. It should be noted that the firing block 5 and the cutter 32 are not fixedly connected, the cutter 32 can drive the firing block 5 to move forward, but when the cutter 32 retreats to the initial position, the firing block 5 will not retreat with it.

[0032] As Figures 3-10 shown, the dial type secondary firing prevention safety mechanism, including the firing block 5 and the cutter assembly 3 arranged in the nail cartridge frame 1, the cutter assembly 3 includes the cutter 31 and the cutter bar 32 driving the cutter 31 movement, the nail cartridge frame 1 is rotatably connected with the safety assembly 6, the safety assembly 6 is connected with the inner wall of the nail cartridge frame 1 through the elastic element 611; the elastic drive safety assembly 6 one end of the lock block 612 is rotated to be connected with the locking part arranged on the cutter 31, the locking part is the limiting hole 311 arranged on the cutter 31, limiting the cutter 31 movement to the cutting direction, realizing locking;

[0033] The end of the safety assembly 6 away from the lock block 612 is provided with the guide part 6212 connected with the unlocking part 51 arranged on the firing block 5, the unlocking part 51 pushes the guide part 6212, so that the safety assembly 6 is rotated to the lock block 612 away from the locking part;

[0034] The safety assembly 6 further includes the first dial wheel 621 and the second dial wheel 622 rotatably driven each other, the lock block 612 is connected with the second dial wheel 622, and the guide part 6212 is connected with the first dial wheel 621. The first dial wheel 621 is further provided with the first dial lever 6211, and the second dial wheel 622 is provided with the second dial lever 6221 connected with the first dial lever 6211, the second dial wheel 622 and the first dial wheel 621 relatively rotate through the mutual dialing of the first dial lever 6211 and the second dial lever 6221. The end of the second dial wheel 622 away from the second dial lever 6221 is sequentially provided with the first connecting block 613 and the second connecting block 614, the lock block 612 is arranged on the second connecting block 614, close to one side of the cutter 31, and the elastic element 611 is arranged on the second connecting block 614, away from the lock block 612.

[0035] The guide part 6212 is connected with the end of the first dial wheel 621 away from the first dial lever 6211, the first inclined surface 6213 is arranged on the guide part 6212, the unlocking part 51 is abutted with the first inclined surface 6213, so that the first dial wheel 621 is rotated, and the first inclined surface 6213 can also be provided with an arc surface.

[0036] The nail cartridge frame 1 is further provided with the stress block 11 connected with the first connecting block 613, the stress block 11 is arranged on the side opposite to the elastic element 611, which limits the position of the first connecting block 613, so as to limit the stroke of the safety assembly 6 rotation. At the same time, the design of the limiting block 11 also plays a supporting role on the lock block 612 when preventing secondary firing, which can prevent the lock block 612 from failing due to the excessive force of the cutter 31 forward movement through the support of the first connecting block and the second connecting block.

[0037] The second inclined surface 6121 is arranged on the lock block 612, which can be slidably connected with the second inclined surface 6121 when the cutter 31 moves reversely, and the second inclined surface 6121 can be arc-shaped.

[0038] In this embodiment, when the anastomat is used or when the firing block 5 and the staple cartridge 4 are not installed in the staple cartridge holder 1 (as shown in Figures 5-8 The firing block 5 is away from the initial position (or not in the staple cartridge holder), under the action of the elastic element 611, the second connecting block 614, the locking block 612, the second dial 622 rotate clockwise, and the first connecting block 613 contacts the force receiving block 1. At this time, the locking block 612 is in the running path of the cutter 31, that is, in the locked state.

[0039] During the reverse movement of the cutter 31, although the locking block 612 is in its running path, the locking block 612 does not affect the reset of the cutter 31 through the sliding fit of the cutter 31 and the second inclined surface 6121 (that is, in the process of the cutter 31 retreating, the second inclined surface 6121 is abutted and slides). When the cutter 31 retreats to the locking hole 311 where the locking block 612 is inserted, the cutter 31 is locked for forward movement, that is, the secondary firing is prevented. However, at this time, the cutter 31 can still move in the reverse direction because the second inclined surface 6121 and the edge of the locking hole 311 can abut and slide. That is, the anvil 2 and the staple cartridge holder 1 can be opened, and the anastomat can be taken out.

[0040] When the anastomat is replaced with a staple cartridge 4, as shown in Figures 3-4 The firing block 5 and the staple cartridge 4 are pushed into the staple cartridge holder 1 in the reverse direction, and under the abutting and sliding of the unlocking part 51 and the first inclined surface 6213, the first dial 621 rotates clockwise, thereby driving the second dial 622 to rotate counterclockwise through the cooperation of the first dial rod 6211 and the second dial rod 6221, the locking block 612 and the connecting block 613 rotate counterclockwise, and the elastic element 611 is compressed. At this time, the locking block 612 is away from the running path of the cutter 31, that is, the safety assembly 6 is in the unlocked state. In this state, the forward movement of the cutter 31 is not limited.

[0041] Among them:

[0042] The safety assembly 6, the force receiving block 11, etc. are symmetrically designed and are respectively on both sides of the cutter 31;

[0043] For the sake of convenience, the clockwise rotation and counterclockwise rotation mentioned above are for the components on one side, that is, the side at position A as shown in Figure 7 The rotating direction of the opposite side at position B is synchronous and opposite, which will not be described here;

[0044] The cooperation of the first dial 621 and the second dial 622 can also be gear cooperation or other cooperation, which can realize relative direction rotation;

[0045] The elastic element 611 can be a spring, a spring sheet, an elastic rubber, etc.

[0046] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application, therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A dial-type secondary-firing prevention safety mechanism for an endoscopic linear cutting stapler, characterized by, The application relates to a firing block and a cutter assembly arranged in a staple cartridge frame, wherein the cutter assembly comprises a cutter and a cutter pushing rod for driving the cutter to move, characterized in that an insurance assembly is rotationally connected in the staple cartridge frame, the insurance assembly is connected with the inner wall of the staple cartridge frame through an elastic element; the elastic element drives a lock block at one end of the insurance assembly to rotate to be connected with a locking part arranged on the cutter, so that the movement of the cutter to the cutting direction is limited, and locking is realized. An orientation part arranged at the other end of the insurance assembly is connected with an unlocking part arranged on the firing block, the unlocking part pushes the orientation part, so that the insurance assembly rotates to make the lock block away from the locking part; wherein the firing block and the cutter are not fixedly connected, when firing, the cutter can push the firing block to move forward, but after firing, when the cutter retreats to the initial position, the firing block will not retreat with the cutter; The insurance assembly further comprises a first ratchet wheel and a second ratchet wheel which are rotationally driven, the lock block is connected with the second ratchet wheel, and the orientation part is connected with the first ratchet wheel; A first ratchet lever is further arranged on the first ratchet wheel, a second ratchet lever is arranged on the second ratchet wheel and connected with the first ratchet lever, the second ratchet wheel and the first ratchet wheel are relatively rotated through mutual ratcheting of the first ratchet lever and the second ratchet lever; A first connecting block and a second connecting block are sequentially arranged at the other end of the second ratchet wheel away from the second ratchet lever, the lock block is arranged on the second connecting block and located on the side close to the cutter, and the elastic element is arranged on the second connecting block and located on the side away from the lock block.

2. The push-to-activate anti-recocking safety mechanism for a linear cutting stapler according to claim 1, wherein: The orientation part is connected with the other end of the first ratchet wheel away from the first ratchet lever, a first inclined surface is arranged on the orientation part, and the unlocking part is abutted with the first inclined surface, so that the first ratchet wheel rotates.

3. The push-to-activate anti-recocking safety mechanism for a linear cutting stapler according to claim 1, wherein: A stress block connected with the first connecting block is further arranged on the staple cartridge frame, the stress block is arranged on the side opposite to the elastic element, the position of the first connecting block is limited, so that the stroke of the rotation of the insurance assembly is limited.

4. The push-to-activate anti-recocking safety mechanism for a linear cutting stapler according to claim 1, wherein: A second inclined surface is arranged on the lock block, the second inclined surface can be slidably connected with the cutter when the cutter moves reversely, and the second inclined surface can be arc-shaped.

5. The push-to-activate anti-recocking safety mechanism for a linear cutting stapler according to claim 1, wherein: The locking part is a limiting hole arranged on the cutter.

6. The push-to-activate anti-recocking safety mechanism for a linear cutting stapler according to claim 3, wherein: The insurance assembly and the stress block are symmetrically designed and arranged on both sides of the cutter.

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