Electric stapler transmission mechanism

Abstract

The present invention relates to an electric stapler transmission mechanism, comprising a stapler body, an external sheath, a driver and a transmission mechanism; the external sheath is arranged on the front side of the stapler body, the driver is slidably connected to the inner side of the external sheath, a connecting shaft is arranged at the rear of the driver, the transmission mechanism comprises a rotating arm, a straight push rod and a threaded transmission shaft, the middle part of the rotating arm is rotatably connected to the stapler body, a vertically extending long groove is provided at the front of the rotating arm, the connecting shaft is slidably connected in the long groove, a complementary notch is provided at the rear bottom end of the rotating arm, the straight push rod is threadedly connected to the threaded transmission shaft, and an integrated pin matching the complementary notch is arranged on the straight push rod. The purpose of the present invention is to provide an electric stapler transmission mechanism. The advantages of the present invention are: high transmission efficiency: the number of rods of the transmission mechanism is small, and the influence of friction and motion interference between the rods on the transmission efficiency is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of medical equipment, and in particular to an electric stapler transmission mechanism. Background Art

[0002] Minimally invasive surgery achieves the same good results as open surgery with as little trauma as possible, and as little or no damage to the patient's internal environment (local or systemic) as possible. As a minimally invasive surgical instrument, staplers are often used for cutting and suturing tissues in some surgical operations. Existing staplers are divided into two types: manual firing and electric firing. Manual firing is to transmit force to the anastomosis component in a purely mechanical way by pressing the handle to complete the firing action. The firing process requires a huge firing force to complete the anastomosis of the tissue, and extremely high requirements are placed on the operator of the instrument. Insufficient firing force will lead to incomplete cutting and closure of tissues, causing surgical accidents. Electric firing transmits power to the anastomosis component through a drive motor to complete the firing action. The firing force is continuous and stable, which can effectively solve the problems caused by manual firing.

[0003] The current electric trigger mainly converts the rotational motion of the motor into the desired motion through the transmission mechanism to achieve the cutting and closing of the tissue by the anastomosis component. Since the tissue thickness of different patients is different, the requirements for the trigger force are also different. The low transmission efficiency of the transmission mechanism or the insufficient output power of the motor can easily lead to abnormalities such as the inability to nail or cut tissue, and the smooth operation cannot be guaranteed.

[0004] The existing technology has defects:

[0005] 1. At present, the transmission mechanism of the electric firing stapler is mainly composed of multiple transmission rods. Friction, transmission gap and interference movement between the rods will occur between the rods. Therefore, in the transmission mechanism, the more transmission rods there are, the lower the transmission efficiency is, and a larger power motor is needed to meet the firing force requirements.

[0006] 2. Conventional transmission mechanisms mainly use motors to drive the cam to rotate and control the movement of the transmission rod, which then transmits the force to the driver of the kiss-cutting component. The precision and hardness of the cam determine the movement stability of the transmission rod, so the production requirements for the cam are extremely high, which also increases the production cost.

[0007] 3. When the transmission mechanism is working, a large rotation angle will occur between the rods. Too large a rotation angle will seriously affect the transmission performance of the mechanism. Summary of the invention

[0008] The object of the present invention is to provide a transmission mechanism for an electric stapler, which can ensure that the electric stapler has sufficient firing force and stability during the firing process.

[0009] The object of the present invention is achieved through the following technical solution: an electric stapler transmission mechanism, comprising a stapler body, an outer sheath, a driver and a transmission mechanism;

[0010] The outer sheath is arranged on the front side of the stapler body, the driver is slidably connected to the inner side of the outer sheath, a connecting shaft is arranged at the rear of the driver, the transmission mechanism comprises a rotating arm, a straight push rod and a threaded transmission shaft, the middle part of the rotating arm is rotatably connected to the stapler body, a vertically extending long groove is provided at the front part of the rotating arm, the connecting shaft is slidably connected in the long groove, a complementary notch is provided at the rear bottom end of the rotating arm, the straight push rod is threadedly connected to the threaded transmission shaft, and an integrated pin matching the complementary notch is provided on the straight push rod.

[0011] Compared with the prior art, the advantages of the present invention are:

[0012] 1. High transmission efficiency: The transmission mechanism has a small number of rods, which effectively reduces the impact of friction and motion interference between the rods on the transmission efficiency. When firing, the power arm of the transmission mechanism is always larger than the resistance arm, which saves effort and avoids insufficient firing force.

[0013] 2. High safety: A firing sensing device is provided on the transmission mechanism, which eliminates the influence of transmission errors between rods by controlling the movement stroke of the rods, ensures that the driver moves to the set stroke, and avoids safety hazards such as incomplete tissue cutting.

[0014] 3. Stable firing process: During the firing process, the rotation angle of the rotating arm is small, and the force transmitted to the driver changes little. In addition, the connecting shaft that cooperates with the driver is connected with the long groove on the rotating arm through the shaft groove. When the rotating arm drives the driver to move, the force direction of the driver is almost consistent and the force is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a transmission mechanism of an electric stapler of the present invention.

[0016] Figure 2 It is a schematic diagram of the disassembled state of the electric stapler transmission mechanism.

[0017] Figure 3 It is a schematic diagram of the coordination relationship between the firing sensing unit A, the starting state sensing block A and the ending state sensing block A.

[0018] Figure 4 It is a schematic diagram of the coordination relationship between the firing sensing device B and the firing sensing device C and the starting state sensing block B and the ending state sensing block C.

[0019] Figure 5 It is a schematic diagram of the labor-saving principle of the transmission mechanism.

[0020] Explanation of reference numerals: 1 anastomosis device body, 2 outer sheath, 3 driver, 3-1 connecting shaft, 3-2 end state sensing block C, 4 rotating arm, 4-1 long slot, 4-2 complementary notch, 4-3 fixing pin, 4-4 starting state sensing block A, 4-5 end state sensing block A, 5 straight push rod, 5-1 integrated pin, 5-2 starting state sensing block B, 6 threaded transmission shaft, 7 firing sensing unit A, 8 firing sensing device B, 9 firing sensing device C. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and embodiments:

[0022] like Figures 1 to 5 Shown is a schematic diagram of an embodiment of an electric stapler transmission mechanism provided by the present invention.

[0023] An electric stapler transmission mechanism comprises a stapler body 1, an outer sheath 2, a driver 3 and a transmission mechanism;

[0024] The outer sheath 2 is arranged on the front side of the anastomosis device body 1, and the driver 3 is slidably connected to the inner side of the outer sheath 2. The outer sheath 2 restricts the driver 3 to move only along the first axis.

[0025] A connecting shaft 3-1 is provided at the rear of the driver 3, and the transmission mechanism includes a rotating arm 4, a straight push rod 5 and a threaded transmission shaft 6. The middle part of the rotating arm 4 is rotatably connected to the anastomosis body 1, so that the rotating arm 4 can rotate around a second axis, and the second axis is not parallel to the first axis.

[0026] A vertically extending long slot 4 - 1 is provided at the front of the rotating arm 4 , and the connecting shaft 3 - 1 is slidably connected in the long slot 4 - 1 . A fixing pin 4 - 3 is provided on the rotating arm 4 , and the fixing pin 4 - 3 is rotatably connected to the anastomosis device body 1 .

[0027] Since the connecting shaft 3-1 is tangentially matched with the plane of the long slot 4-1, when the rotating arm 4 rotates around the second axis, the rotating arm 4 and the connecting shaft 3-1 collide with each other, driving the connecting shaft 3-1 and the driver 3 to translate along the first axis. The purpose of adopting the shaft-slot matching connection method is to keep the motion state of the driver 3 and the rotating arm 4 unchanged during the firing process, so that the force direction of the driver 3 is almost unchanged, and the force is stable.

[0028] A complementary notch 4 - 2 is provided at the rear bottom end of the rotating arm 4 , and the straight push rod 5 is threadedly connected to the threaded transmission shaft 6 , and an integral pin 5 - 1 cooperating with the complementary notch 4 - 2 is provided on the straight push rod 5 .

[0029] The upper top of the complementary notch 4-2 is arc-shaped, and an arc hook is also provided at the lower opening thereof; the integrated pin 5-1 is a raised block with a cross-section larger than half a circle.

[0030] The complementary recesses 4 - 2 , the straight push rods 5 and the integrated pins 5 - 1 are each provided in pairs, and the bottoms of the two straight push rods 5 are connected via a bottom plate, and the bottom plate is connected to the threaded transmission shaft 6 .

[0031] The raised block can only be assembled in the complementary notch at a specific angle, ensuring that the straight push rod 5 and the rotating arm 4 will not separate during movement. When firing, the arc surface above the complementary notch contacts the arc surface of the integrated pin 5-1, the straight push rod 5 moves forward to push the rotating arm 4 to rotate, and the driver 3 moves forward; when retracting, the arc hook contacts the integrated pin 5-1, the straight push rod 5 retreats and drags the rotating arm 4, the rotating arm 4 produces a rotating motion, and the driver 3 retreats. The integrated pin on the straight push rod 5 is a columnar object with a cross-section larger than half a circle, which provides sufficient matching margin for the integrated pin 5-1 and the complementary notch during movement, so that the rotating arm and the straight push rod do not interfere with each other during the firing process.

[0032] The distance L2 between the integrated pin 5 - 1 and the fixing pin 4 - 3 is greater than the distance L1 between the fixing pin 4 - 3 and the connecting shaft 3 - 1 .

[0033] Since the entire transmission mechanism has only two parts, the straight push rod and the rotating arm, the response speed is fast when firing. A small number of transmission rods can effectively reduce the influence of friction and motion interference between the transmission rods on the transmission efficiency of the transmission mechanism. It should be pointed out in particular that during movement, the distance L2 between the integrated pin 5-1 and the fixed pin 4-3 is greater than the distance L1 between the fixed pin 4-3 and the connecting shaft 3-1, that is, the power arm is always greater than the resistance arm (L1>L2). When the motor drives the threaded transmission shaft 6 to rotate, and the torque input by the threaded transmission shaft 6 is the same, it has the effect of saving effort in firing (F1<F2) and high transmission efficiency. In addition, the stroke of the driver is short during the entire firing process, and the rotating arm does not need to rotate too much to meet the firing requirements. The force transmitted to the driver by the transmission mechanism changes little and the output is stable.

[0034] The top of the straight push rod 5 is inclined toward the front side, and the straight push rod 5 is displaced along the third axis direction, and the third axis is not parallel to the first axis and the second axis.

[0035] Electric firing has strict requirements on the stroke of the driver. Insufficient firing stroke may cause incomplete tissue cutting and ultimately lead to surgical failure. In order to accurately control the firing and retraction stroke of the electric stapler, a starting state and an ending state sensing device must be provided. The starting state and the ending state can be sensed by the same or multiple sensing devices.

[0036] The device also includes a firing sensing unit A7 arranged in the anastomosis body 1, and a starting state sensing block A4-4 and a terminal state sensing block A4-5 are provided on the rotating arm 4. Before the rotating arm 4 is fired, the starting state sensing block A4-4 is located at the sensing position of the firing sensing unit A7; after the rotating arm 4 is fired in place, the terminal state sensing block A4-5 rotates to the sensing position of the firing sensing unit A7.

[0037] When the starting state sensing block A4-4 or the ending state sensing block A4-5 moves to the set position and is detected by the firing sensing unit A7, a signal can be output to control the working state of the motor switch.

[0038] The device also includes a firing sensing device B8 disposed at the handle of the anastomosis body 1 and a firing sensing device C9 disposed at the outer sheath 2;

[0039] The straight push rod 5 is provided with a starting state sensing block B5-2, which is located at the sensing position of the firing sensing device B8 before firing;

[0040] The driver 3 is provided with a termination state sensing block C3 - 2 , which moves to the sensing position of the firing sensing device C9 after the firing is completed.

[0041] When the starting state sensing block B5-2 is in the firing sensing device B8 position, the sensing device senses that the straight push rod is in the starting state position and transmits a signal to the control circuit, and then the motor can be controlled to perform the firing operation. During the firing process, when the terminal state sensing block C3-2 moves to the firing sensing device C9 position, the sensing device senses that the driver is in the terminal state position and transmits a signal to the control circuit, the line of the drive motor is cut off, and the driver stops moving. The purpose of this design is to eliminate the influence of the transmission error between the rods and ensure that the driver moves and retreats according to the set stroke during the entire firing process.

[0042] It should be pointed out that in addition to the above-listed sensing position settings, the sensing position can also be set at different locations of the moving component, or a mechanical button structure can be used to limit the positions of the starting state and the ending state. The principles are obvious.

[0043] During firing, when the firing sensing device B8 senses that the straight push rod is in the starting state, the motor drives the straight push rod to move along the third axis. The straight push rod in the advancing state, the integrated pin 5-1 thereon contacts the complementary notch 4-2 on the rotating arm 4, and the integrated pin 5-1 drives the rotating arm to rotate around the second axis. The rotating arm in the rotating state, the long slot 4-1 thereon contacts the connecting shaft of the driver, driving the driver to move along the first axis. When the firing sensing device C9 senses that the driver moves to the terminal state, the motor stops rotating, the driver stops moving, and the cutting and suturing of the tissue are completed. At this time, a pressure holding program can be set, and the knife is automatically retracted after the pressure holding is completed, and the motor drives the straight push rod to retract along the third axis. At this time, the integrated pin 5-1 on the straight push rod contacts the arc hook of the complementary notch on the rotating arm, and the dragged rotating arm produces a rotational motion around the second axis, and the rotating arm drives the driver to retract along the first axis. When the firing sensing device B8 senses that the straight push rod retracts to the starting state, the motor stops rotating, the driver stops retracting, and the knife is retracted. The entire firing process is now completed.

Claims

1. An electric stapler transmission mechanism, characterized in that: It comprises a stapler body (1), an external sheath (2), a driver (3) and a transmission mechanism; The outer sheath (2) is arranged on the front side of the anastomosis device body (1), the driver (3) is slidably connected to the inner side of the outer sheath (2), the rear part of the driver (3) is provided with a connecting shaft (3-1), the transmission mechanism comprises a rotating arm (4), a straight push rod (5) and a threaded transmission shaft (6), the middle part of the rotating arm (4) is rotatably connected to the anastomosis device body (1), the front part of the rotating arm (4) is provided with a vertically extending long groove (4-1), the connecting shaft (3-1) is slidably connected in the long groove (4-1), the rear bottom end of the rotating arm (4) is provided with a complementary notch (4-2), the straight push rod (5) is threadedly connected to the threaded transmission shaft (6), and the straight push rod (5) is provided with an integrated pin (5-1) that cooperates with the complementary notch (4-2).

2. The electric stapler transmission mechanism according to claim 1, characterized in that: The rotating arm (4) is provided with a fixing pin (4-3), and the fixing pin (4-3) is rotatably connected to the anastomosis device body (1).

3. The electric stapler transmission mechanism according to claim 1, characterized in that: The upper top of the complementary notch (4-2) is in an arc shape, and an arc hook is also provided at the lower opening thereof; the integrated pin (5-1) is a raised block with a cross section larger than half a circle.

4. The electric stapler transmission mechanism according to claim 2, characterized in that: The distance L2 between the integrated pin (5-1) and the fixed pin (4-3) is greater than the distance L1 between the fixed pin (4-3) and the connecting shaft (3-1).

5. The electric stapler transmission mechanism according to claim 1, characterized in that: The top of the straight push rod (5) is inclined toward the front side.

6. The electric stapler transmission mechanism according to any one of claims 1 to 5, characterized in that: The anastomosis device further comprises a firing sensing unit A (7) arranged in the anastomosis device body (1); the rotating arm (4) is provided with a starting state sensing block A (4-4) and a final state sensing block A (4-5); before the rotating arm (4) is fired, the starting state sensing block A (4-4) is located at the sensing position of the firing sensing unit A (7); after the rotating arm (4) is fired in place, the final state sensing block A (4-5) rotates to the sensing position of the firing sensing unit A (7).

7. The electric stapler transmission mechanism according to claim 6, characterized in that: It also includes a firing sensing device B (8) arranged at the handle of the anastomosis device body (1) and a firing sensing device C (9) arranged at the outer sheath (2); The straight push rod (5) is provided with an initial state sensing block B (5-2), and before firing, the initial state sensing block B (5-2) is located at a sensing position of a firing sensing device B (8); The driver (3) is provided with a termination state sensing block C (3-2), and after the firing is completed, the termination state sensing block C (3-2) moves to the sensing position of the firing sensing device C (9).

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