End effectors and surgical instruments

Abstract

The present invention relates to an end effector and a surgical instrument, comprising a nail anvil assembly, a nail magazine assembly support arranged relative to the nail anvil assembly, and a closing drive assembly driving the nail magazine assembly support and the nail anvil assembly to move relative to each other so as to close or open the end effector, the end effector further comprising a driven wheel and a driving block, a driven wheel is arranged on the side wall of one of the nail magazine assembly support and the nail anvil assembly, and a hook groove is arranged on the side wall, and a driving block is arranged on the other, the driven wheel comprises a contact portion contacting the driving block and a hook portion connected with the hook groove by a buckle, when the closing drive assembly drives the end effector to close, the driving block docks with the contact portion to drive the driven wheel to rotate, and drives the hook portion to move toward the hook groove until a buckle connection is achieved. The present invention is provided with a driven wheel and a driving block that cooperate with each other, so that when the end effector is closed, the driving block drives the driven wheel to buckle with the hook groove to reliably connect the end effector and prevent it from flipping.

Description

Technical Field

[0001] The invention relates to an end effector and a surgical instrument, belonging to the technical field of medical instruments. Background Art

[0002] In general surgical treatment, surgical instruments are surgical tools used in medical operations, and staplers are surgical instruments that are often used to complete the cutting and anastomosis of tissues. They are medically used devices that replace manual suturing, and their main working principle is to use titanium staples (suture staples) to separate or anastomose tissues, similar to a stapler. However, the staplers of the prior art have the following disadvantages: when closing the target tissue during surgery, since the front end of the stapler is a cantilever structure, such a design makes the stapler rigid. When the stapler is closing a larger target tissue, it will be subjected to pressure from other parts of the target tissue, causing the stapler to deform and the jaws to flip. The prior art has a complex structure, and requires a lot of manual force to overcome the flipping of the jaws. In addition, the reliability is not high, and the force control is difficult to grasp. Summary of the invention

[0003] The object of the present invention is to provide an end effector and a surgical instrument which can prevent the jaws from turning over and have a simple structure and are easy to operate.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an end actuator, comprising an anvil assembly, a nail magazine assembly bracket arranged relative to the nail anvil assembly, and a closing drive assembly driving the nail magazine assembly bracket and the nail anvil assembly to move relative to each other so that the end actuator is closed or opened, the end actuator also comprising a driven wheel and a driving block, the driven wheel is arranged on the side wall of one of the nail magazine assembly bracket and the nail anvil assembly and a hook groove is arranged on the side wall, the driving block is arranged on the other of the nail magazine assembly bracket and the nail anvil assembly, the driven wheel comprises a contact portion contacting the driving block, the driven wheel is provided with a hook portion snap-connected to the hook groove, when the closing drive assembly drives the end actuator to close, the driving block docks with the contact portion to drive the driven wheel to rotate, and drives the hook portion to move toward the hook groove until the snap connection is achieved.

[0005] Furthermore, a plurality of end face teeth are formed on the contact portion, and the driving block is a rack.

[0006] Furthermore, the contact portion is a roller, and the driving block is tangent to the outer circular end surface of the roller.

[0007] Furthermore, a protrusion is provided on the side wall of one of the nail magazine assembly bracket and the nail anvil assembly, and the hook groove is formed on the protrusion.

[0008] Furthermore, the nail magazine assembly bracket includes a frame portion for installing the nail magazine assembly and a connecting portion extending rearward from the frame portion, the closing drive assembly includes a closing axis, the connecting portion of the nail magazine assembly bracket is movably mounted on the closing axis, and the nail magazine assembly bracket moves on the closing axis along the longitudinal direction of the closing axis; when the anvil assembly applies a thrust to the frame portion of the nail magazine assembly bracket, the connecting portion of the nail magazine assembly bracket can swing relative to the closing drive assembly along a first direction, and the first direction is the direction of the force exerted by the anvil bracket on the nail magazine assembly bracket.

[0009] Furthermore, the closing drive assembly also includes a closing nut arranged on the closing shaft, the closing nut is threadedly connected to the closing shaft, the connecting end has a mounting hole, the closing nut is inserted into the mounting hole, and there is a clearance fit between the closing nut and the mounting hole.

[0010] Furthermore, the end actuator also includes a cutting assembly fired by the firing rod and used to cut the target tissue.

[0011] Furthermore, the cutting assembly includes a firing nut disposed on the firing rod and a blade disposed on the firing nut.

[0012] Furthermore, the blade has a cutting edge surface, and the cutting edge surface is arranged opposite to the firing rod.

[0013] The present invention also provides a surgical instrument, comprising a handle portion and a working head, wherein the working head comprises the end effector as described above.

[0014] The beneficial effects of the present invention are as follows: the present invention is provided with a driven wheel and a driving block that cooperate with each other, and a hook portion is provided on the driven wheel, so that when the end actuator is closed, the driving block drives the hook portion on the driven wheel to be connected with the hook groove to fix the end actuator to prevent it from flipping over; the present invention has a simple structure and is easy to operate.

[0015] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a surgical instrument shown in Example 1 of the present invention.

[0017] Figure 2 for Figure 1 Cross-sectional view of the end effector when open.

[0018] Figure 3 for Figure 1 Another cross-sectional view of the middle end actuator when it is open.

[0019] Figure 4 for Figure 1 Cross-sectional view of the end effector when closed.

[0020] Figure 5 Schematic diagram of the driven wheel and driving block combination. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention. The above, below, left, right, front, and back position relationships described below are based on the following embodiments. Figure 1 As a reference reference, Figure 1 The direction of the arrow aa is the up-down direction, and the direction of the arrow bb is the front-back direction.

[0022] See also Figures 1 to 5 The surgical instrument shown in one embodiment of the present invention is an electrically driven stapler (hereinafter referred to as a stapler), which is used for suturing and cutting tissues. The stapler includes a gun body and a staple cartridge assembly 100 mounted on the gun body. The gun body includes a handle portion (not shown) and a working head 10. In this embodiment, the handle portion is a reusable and sterilizable electric handle, which is provided with a quick connector and a signal transmission port. A replaceable battery pack for providing power is also provided in the handle portion. A power input device (not shown) for inputting power is provided in the handle portion, and the power input device includes a motor. The connection method between the motor and the battery is a conventional design in the prior art, so it will not be described in detail here. The closing, opening and firing actions of the working head 10 are driven by the handle portion.

[0023] The working head 10 includes a housing 1, a central support (not shown), a closing transmission assembly (not shown), a firing transmission assembly (not shown), a switching component (not shown), and an end actuator 2. The central support is fixed in the housing 1, and the closing transmission assembly and the firing transmission assembly are enclosed in the housing 1. One end of the closing transmission assembly and the firing rotation assembly is connected to the motor through a power transmission assembly (not shown), and the other ends of the closing transmission assembly and the firing transmission assembly are respectively connected to the end actuator 2 and supported by the central support. The closing transmission assembly and the firing transmission assembly are connected to the handle part to transmit the power of the handle part to the end actuator 2, so that the closing transmission assembly and the firing transmission assembly drive the end actuator 2 to achieve closing, firing, firing reset and opening. The closing transmission assembly, the firing transmission assembly, the switching component and the central support are conventional designs in the art, so they are not described in detail here.

[0024] See also Figures 2 to 5 The end actuator 2 includes an anvil assembly 21, a cartridge assembly support 22 arranged relative to the anvil assembly 21, and a closing drive assembly that drives the cartridge assembly support 22 and the anvil assembly 21 to move relative to each other so as to close or open the end actuator. The opening or closing of the end actuator 2 is completed by the anvil assembly 21 and the cartridge assembly support 22. The anvil assembly 21 and the cartridge assembly support 22 form a jaw, and the closing of the jaw is the closing of the end actuator 2, and the opening of the jaw is the opening of the end actuator 2. In this embodiment, the anvil assembly 21 is fixedly arranged, and the closing drive assembly is connected to the cartridge assembly support 22 to drive the cartridge assembly support 22 to move relative to the anvil assembly 21.

[0025] The anvil assembly 21 includes an anvil support 211 and an anvil head 212 disposed at the end of the anvil support 211, the anvil head 212 is snap-connected with the anvil support 211, and the anvil support 211 includes a bottom wall 2111 and side walls 2112 extending upward from the left and right sides of the bottom wall 2111. The nail magazine assembly support 22 is a cantilever structure, and includes a frame portion 221 for fixing the nail magazine assembly and a connection portion 222 extending backward from the frame portion 221 and used to connect the frame portion 221 and the closing drive assembly.

[0026] The end actuator also includes a cutting assembly 4 that is fired by the firing rod 3 and is used to cut the target tissue, and the cutting assembly 4 is arranged on the anvil assembly 21 or the nail magazine assembly bracket 22. The cutting assembly 4 includes a firing nut 42 arranged on the firing rod 3 and a blade 41 arranged on the firing nut 42. The blade 41 has a blade surface and a blade back arranged opposite to the blade surface, and the blade surface is arranged opposite to the firing rod 3. In this embodiment, the cutting assembly 4 is arranged on the anvil assembly 21, and the anvil assembly 21 is fixedly arranged, and the nail magazine assembly bracket 22 moves relative to the anvil assembly 21. Of course, the cutting assembly 4 can also be arranged on the nail magazine assembly bracket 22, and the nail magazine assembly bracket 22 is fixedly arranged, and the anvil assembly 21 moves relative to the nail magazine assembly bracket 22.

[0027] The closing drive assembly includes a closing shaft 51, and the connecting portion 222 of the staple cartridge assembly support 22 is movably mounted on the closing shaft 51, and the staple cartridge assembly support 22 moves on the closing shaft 51 along the longitudinal direction of the closing shaft 51. When the nail anvil assembly 21 applies a thrust to the frame portion 221 of the nail cartridge assembly support 22, the connecting portion 222 of the nail cartridge assembly support 22 can swing relative to the closing drive assembly along a first direction, and the first direction is the direction of the force applied by the nail anvil support 211 on the nail cartridge assembly support 22. When the surgical instrument is clamping and cutting tissue, the staple cartridge assembly support 22 will be subjected to a force in the first direction, and thus will swing along the first direction (i.e., the aa direction). The source of the thrust is generated by the surgical instrument when clamping and cutting tissue, one is the thrust generated by squeezing the tissue, and the other is the force generated by suturing and cutting tissue.

[0028] The closing drive assembly further includes a closing nut 52 disposed on the closing shaft 51, the closing nut 52 being threadedly connected to the closing shaft 51, the connecting portion 222 having a mounting hole, the closing nut 52 being inserted into the mounting hole, and a clearance fit between the closing nut 52 and the mounting hole. A bevel transmission gear set is disposed between the closing shaft 51 and the closing transmission assembly, the bevel transmission gear set including a first bevel gear 61 disposed on the closing transmission assembly and a second bevel gear 62 meshing with the first bevel gear 61 and disposed on the closing shaft 51.

[0029] The end actuator also includes a driven wheel 24 and a driving block 23. The driven wheel 24 is arranged on the side wall 2112 of one of the nail magazine assembly bracket 22 and the nail anvil assembly 21, and a hook groove 25 is arranged on the side wall 2112. The driving block 23 is arranged on the other of the nail magazine assembly bracket 22 and the nail anvil assembly 21. The driven wheel 24 includes a contact portion 241 that contacts the driving block 23, and a hook portion 242 that is snap-connected with the hook groove 25 is arranged on the driven wheel 24. When the closing drive assembly drives the end actuator to close, the driving block 23 docks with the contact portion 241 to drive the driven wheel 24 to rotate, and drives the hook portion 242 to move toward the hook groove 25 until the snap connection is achieved. In this embodiment, the driving block 23 is fixedly arranged on the nail magazine assembly bracket 22, the hook groove 25 is fixedly arranged on the side wall 2112 of the nail anvil bracket 211, and the driven wheel 24 is connected to the side wall 2112 through a shaft. Of course, in other embodiments, the driving block 23 can also be arranged on the nail anvil assembly 21, and correspondingly, the driven wheel 24 and the hook groove 25 are arranged on the nail magazine assembly bracket 22, which is not specifically limited here. The following description is based on this embodiment.

[0030] The driving block 23 is a rack, and a plurality of end teeth are formed on the contact portion 241. The end teeth mesh with the rack to form a gear rack mechanism. The rack moves to drive the driven wheel 24 to move so that the hook portion 242 moves. A protrusion 26 is provided on the side wall 2112 of the anvil assembly 21, and the hook groove 25 is formed on the protrusion 26. The hook portion 242 moves and finally snaps into connection with the snap groove to achieve the effect of fixing the nail magazine assembly bracket 22. Of course, the driving block 23 may not be a rack. In this case, the contact portion 241 is a roller, and the driving block 23 is tangent to the outer cylindrical end surface of the roller, which can also achieve the effect of driving the driven wheel 24. No specific limitation is made here.

[0031] The working process of the end effector is as follows: when the nail magazine assembly bracket 22 slides toward the nail anvil assembly 21, the driving block 23 moves toward the nail anvil assembly 21 along with the nail magazine assembly bracket 22 until the contact portion 241 of the driven wheel 24 disposed in the nail anvil assembly 21 contacts the driving block 23. The driving block 23 drives the driven wheel 24 to rotate through the contact portion 241, so that the hook portion 242 disposed on one side of the driven wheel 24 moves toward the hook groove 25 until it is buckled and connected with the hook groove 25.

[0032] In summary, the present invention is provided with a driven wheel 24 and a driving block 23 that cooperate with each other, and a hook portion 242 is provided on the driven wheel 24, so that when the end actuator is closed, the driving block 23 drives the hook portion 242 on the driven wheel 24 to snap into connection with the hook groove 25 to fix the end actuator to prevent it from flipping over; the present invention has a simple structure and is easy to operate.

[0033] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An end actuator, comprising an anvil assembly, a cartridge assembly support arranged relative to the anvil assembly, and a closing drive assembly for driving the cartridge assembly support and the anvil assembly to move relative to each other so as to close or open the end actuator, characterized in that: The end actuator also includes a driven wheel and a driving block, the driven wheel is arranged on the side wall of one of the nail magazine assembly bracket and the nail anvil assembly, and the side wall is provided with a hook groove, the driving block is arranged on the other of the nail magazine assembly bracket and the nail anvil assembly, the driven wheel includes a contact portion that contacts the driving block, and the driven wheel is provided with a hook portion that is buckled and connected with the hook groove. When the closing drive assembly drives the end actuator to close, the driving block docks with the contact portion to drive the driven wheel to rotate, driving the hook portion to move toward the hook groove until the buckle connection is achieved, a plurality of end face teeth are formed on the contact portion, and the driving block is a rack. The end actuator also includes a cutting assembly that is fired by the firing rod and is used to cut the target tissue.

2. The end effector according to claim 1, characterized in that: A protrusion is arranged on the side wall of one of the nail magazine assembly support and the nail anvil assembly, and the hook groove is formed on the protrusion.

3. The end effector according to claim 1, characterized in that: The nail magazine assembly bracket includes a frame portion for installing the nail magazine assembly and a connecting portion extending backward from the frame portion, the closing drive assembly includes a closing axis, the connecting portion of the nail magazine assembly bracket is movably mounted on the closing axis, and the nail magazine assembly bracket moves on the closing axis along the longitudinal direction of the closing axis; when the anvil assembly applies a thrust to the frame portion of the nail magazine assembly bracket, the connecting portion of the nail magazine assembly bracket can swing relative to the closing drive assembly along a first direction, and the first direction is the direction of the force exerted by the anvil assembly on the nail magazine assembly bracket.

4. The end effector according to claim 3, characterized in that: The closing drive assembly also includes a closing nut arranged on the closing shaft, the closing nut is threadedly connected to the closing shaft, the connecting portion has a mounting hole, the closing nut is inserted into the mounting hole, and there is a clearance fit between the closing nut and the mounting hole.

5. The end effector according to claim 1, characterized in that: The cutting assembly includes a firing nut arranged on the firing rod and a blade arranged on the firing nut.

6. The end effector according to claim 5, characterized in that: The blade has a cutting edge surface, and the cutting edge surface is arranged opposite to the firing rod.

7. A surgical instrument, comprising a handle and a working head, characterized in that: The working head comprises the end effector according to any one of claims 1 to 6.

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