Transmission mechanism of electric anastomat

Abstract

The utility model relates to a transmission mechanism of an electric anastomat. The transmission mechanism comprises an anastomat body, an outer sheath, a driver and a transmission mechanism body, the outer sheath is arranged on the front side of the anastomat body, the driver is slidably connected to the inner side of the outer sheath, a connecting shaft is arranged on the rear portion of the driver, the transmission mechanism comprises a rotating arm, a straight push rod and a threaded transmission shaft, the middle of the rotating arm is rotatably connected to the anastomat body, and a long groove extending vertically is formed in the front portion of the rotating arm. The connecting shaft is connected into the long groove in a sliding mode, a complementary notch is formed in the bottom end of the rear portion of the rotating arm, the straight push rod is connected to the threaded transmission shaft in a threaded mode, and an integrated pin matched with the complementary notch is arranged on the straight push rod. The utility model aims to provide a transmission mechanism of an electric anastomat. The transmission mechanism has the advantages that the transmission efficiency is high, the number of rod pieces of the transmission mechanism is small, and the influence of friction and motion interference between the rod pieces on the transmission efficiency is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, and specifically discloses an electric anastomat transmission mechanism. BACKGROUND

[0002] Minimally invasive surgery is to achieve the same good effect as open surgery with as little or no trauma and as little or no damage to the internal environment (local or systemic) of the patient. As a kind of minimally invasive surgical instrument, an anastomat is often used for cutting and suturing tissues in some surgical operations. The existing anastomat is divided into two types: manual firing and electric firing. Manual firing is to complete the firing action by pressing the handle to transmit force to the anastomizing assembly in a purely mechanical way. A huge firing force is required to complete the anastomosis of the tissue during the firing process, which requires a high level of skill for the operator of the instrument. Insufficient firing force will lead to incomplete cutting and closing of the tissue, resulting in surgical accidents. Electric firing is to complete the firing action by transmitting power to the anastomizing assembly through a driving motor. The firing force is continuous and stable, which can effectively solve the problems of manual firing.

[0003] Currently, the electric firing mainly converts the rotary motion of the motor into the expected motion through the transmission mechanism to realize the cutting and closing of the anastomizing assembly on the tissue. Since the thickness of the tissue of different patients is inconsistent, the requirement for the firing force is also different. The low transmission efficiency of the transmission mechanism or the insufficient output power of the motor can easily lead to abnormal situations such as the failure of the instrument to form a nail or the failure of the instrument to cut the tissue, which cannot guarantee the smoothness of the operation.

[0004] The prior art has the following defects:

[0005] 1. The transmission mechanism of the current electric firing anastomat mainly consists of multiple transmission rods. Friction, transmission gap and interference motion between the rods may occur between the rods. Therefore, the more the number of transmission rods in the transmission mechanism, the lower the transmission efficiency, and a larger power motor is required to meet the requirement of the firing force.

[0006] 2. The conventional transmission mechanism mainly controls the motion of the transmission rod by rotating the cam driven by the motor, and then the transmission rod transmits the force to the driver of the anastomizing assembly. The precision and hardness of the cam determine the stability of the motion of the transmission rod, so the production requirement for the cam is extremely high, which also increases the production cost.

[0007] 3. When the transmission mechanism is working, a large rotation angle may occur between the rods, which seriously affects the transmission performance of the mechanism. SUMMARY

[0008] The utility model aims at providing a kind of electric anastomat transmission mechanism, can guarantee that electric anastomat has sufficient firing force and stability in the process of firing.

[0009] The utility model discloses a drive mechanism of electric anastomat, including anastomat body, external sheath, driver and drive mechanism,

[0010] The external sheath is arranged at the front side of the anastomat body, the driver is slidably connected to the inner side of the external sheath, the rear portion of the driver is provided with a connecting shaft, the drive mechanism comprises a rotating arm, a straight push rod and a threaded transmission shaft, the middle portion of the rotating arm is rotatably connected to the anastomat body, the front portion of the rotating arm is provided with a vertically extending long slot, the connecting shaft is slidably connected to the long slot, the rear bottom end of the rotating arm is provided with a complementary notch, the straight push rod is threadedly connected to the threaded transmission shaft, and the straight push rod is provided with an integral type pin matched with the complementary notch.

[0011] Compared with the prior art, the utility model has the advantages that:

[0012] 1. High transmission efficiency: the number of rod members of the drive mechanism is small, effectively reducing the influence of friction and motion interference between rod members on transmission efficiency. The power arm of the drive mechanism is always greater than the resistance arm during firing, which plays the effect of labor-saving firing and avoids insufficient firing force.

[0013] 2. High safety: the firing sensing device is arranged on the drive mechanism, the influence of transmission error between rod members is eliminated by controlling the motion stroke of the rod member, the driver is ensured to travel to the set stroke, and safety hazards such as incomplete tissue cutting are avoided.

[0014] 3. Stable firing process: during the firing process, the rotation angle of the rotating arm is small, and the force change transmitted to the driver is small. In addition, the connecting shaft matched with the driver and the long slot on the rotating arm are connected through the shaft slot, and when the rotating arm drives the driver to move, the stress direction of the driver is almost consistent, and the stress is stable. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the drive mechanism of the utility model electric anastomat.

[0016] Figure 2 It is a split state schematic diagram of the drive mechanism of the electric anastomat.

[0017] Figure 3 It is the cooperation relationship schematic diagram of the firing sensing unit A and the starting state sensing block A and the termination state sensing block A.

[0018] Figure 4 It is the cooperation relationship schematic diagram of the firing sensing device B and the firing sensing device C and the starting state sensing block B and the termination state sensing block C.

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

[0020] Brief description of the drawings: 1 anastomat body, 2 external sheath, 3 driver, 3-1 connecting shaft, 3-2 termination state sensing block C, 4 rotating arm, 4-1 long slot, 4-2 complementary notch, 4-3 fixed pin, 4-4 initial state sensing block A, 4-5 termination state sensing block A, 5 straight push rod, 5-1 integral pin, 5-2 initial 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 content of the utility model will be described in detail below in combination with the drawings and examples of the specification:

[0022] As Figures 1 to 5 shown is an embodiment schematic diagram of the electric anastomat transmission mechanism provided by the utility model.

[0023] An electric anastomat transmission mechanism, comprising an anastomat body 1, an external sheath 2, a driver 3 and a transmission mechanism;

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

[0025] 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 anastomat body 1, so that the rotating arm 4 can rotate around the second axis, and the second axis is not parallel to the first axis.

[0026] The front part of the rotating arm 4 is provided with a vertically extending long slot 4-1, the connecting shaft 3-1 is slidably connected to the long slot 4-1, and the rotating arm 4 is provided with a fixed pin 4-3, and the fixed pin 4-3 is rotatably connected to the anastomat body 1.

[0027] Since the connecting shaft 3-1 is tangent to 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 are in contact, which drives the connecting shaft 3-1 and the driver 3 to move along the first axis. The purpose of the shaft slot connection mode is to keep the movement state of the driver 3 and the rotating arm 4 unchanged during the firing process, so that the force of the driver 3 hardly changes, and the stability of the force is ensured.

[0028] 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 integral pin 5-1 matched with the complementary notch 4-2.

[0029] The upper top of the complementary recess 4-2 is circular arc-shaped, and a circular arc hook is arranged at the lower side opening thereof; the integral pin 5-1 is a convex block with a cross section greater than one-half of a circle.

[0030] The complementary recess 4-2, the straight push rod 5 and the integral pin 5-1 are arranged in pairs, the bottoms of the two straight push rods 5 are connected through a bottom plate, the bottom plate is connected with the threaded transmission shaft 6.

[0031] The convex block can be assembled into the complementary recess only at a specific angle, so that the straight push rod 5 and the rotating arm 4 are always not separated during movement. When firing, the circular arc surface above the complementary recess is in contact with the circular arc surface of the integral pin 5-1, the straight push rod 5 advances to push the rotating arm 4 to rotate, and the driver 3 advances; when retracting, the circular arc hook is in contact with the integral pin 5-1, the straight push rod 5 retreats to drag the rotating arm 4, the rotating arm 4 generates rotary motion, and the driver 3 retreats. The integral pin on the straight push rod 5 is a columnar object with a cross section greater than one-half of a circle, which provides sufficient fitting allowance for the integral pin 5-1 and the complementary recess during movement, so that the rotating arm and the straight push rod do not interfere with each other during firing.

[0032] The distance L2 between the integral 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.

[0033] Since only the straight push rod and the rotating arm are provided in the entire transmission mechanism, the response speed during firing is fast. The small number of transmission rods can effectively reduce the influence of the friction and movement interference between the rods on the transmission efficiency. It should be particularly pointed out that the distance L2 between the integral 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 during movement, that is, the power arm is always greater than the resistance arm (L1>L2). When the motor rotates the threaded transmission shaft 6, the torsion input by the threaded transmission shaft 6 is the same, so that the firing labor-saving effect is achieved (F1<F2), and the transmission efficiency is high. In addition, the stroke of the driver during the entire firing process is short, the rotating arm does not need to rotate through a large angle to meet the firing requirements, the force transmitted by the transmission mechanism to the driver changes little, and the output is stable.

[0034] The top of the straight push rod 5 is inclined to the front side, 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] The electric firing has strict requirements on the stroke of the driver, and insufficient firing stroke may cause incomplete cutting of the tissue and finally lead to surgical failure. In order to accurately control the firing and retraction strokes of the electric anastomat, a starting state and a termination state sensing device need to be arranged, which can be the same or multiple sensing devices for sensing the starting state and the termination state.

[0036] The device also comprises a firing sensing unit A7 arranged in the anastomat body 1, and the rotating arm 4 is provided with a starting state sensing block A4-4 and a termination state sensing block A4-5, wherein the starting state sensing block A4-4 is located in the sensing position of the firing sensing unit A7 before the rotating arm 4 is fired, and the termination state sensing block A4-5 is rotated to the sensing position of the firing sensing unit A7 after the rotating arm 4 is fired.

[0037] When the starting state sensing block A4-4 or the termination 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 switch of the motor.

[0038] The device also comprises a firing sensing device B8 arranged at the handle of the anastomat body 1 and a firing sensing device C9 arranged at the external sheath 2.

[0039] The straight push rod 5 is provided with a starting state sensing block B5-2, and the starting state sensing block B5-2 is located in 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, and the termination state sensing block C3-2 moves to the sensing position of the firing sensing device C9 after firing.

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

[0042] It should be noted that in addition to the above-mentioned sensing position settings, the sensing position settings can also be arranged at different positions of the moving member, or a mechanical button structure can be used to limit the positions of the starting state and the termination state, and the principles are obvious.

[0043] When the firing sensing device B8 senses that the straight push rod is in the initial state, the motor drives the straight push rod to move along the third axis. The integrated pin 5-1 on the straight push rod in the advancing state is in contact with 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 long slot 4-1 on the rotating arm in the rotating state is in contact with the connecting shaft of the driver, and drives the driver to advance along the first axis. When the firing sensing device C9 senses that the driver advances to the terminal state, the motor stops rotating, the driver stops advancing, the cutting and suturing of the tissue are completed, at this time, a pressure maintaining program can be set, after the pressure maintaining is completed, the automatic retraction is performed, the motor drives the straight push rod to retreat along the third axis. At this time, the integrated pin 5-1 on the straight push rod is in contact with the arc hook of the complementary notch on the rotating arm, the dragged rotating arm rotates around the second axis, and the rotating arm drives the driver to retreat along the first axis. When the firing sensing device B8 senses that the straight push rod retreats to the initial state, the motor stops rotating, the driver stops retreating, and the retraction is completed. Thus, the entire firing process is completed.

Claims

1. An electrically powered anastomosis device transmission mechanism characterized by: The anastomat comprises an anastomat body (1), an external sheath (2), a driver (3) and a transmission mechanism. The external sheath (2) is arranged on the front side of the anastomat body (1), the driver (3) is slidably connected to the inner side of the external 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 anastomat body (1), the front part of the rotating arm (4) is provided with a vertical long slot (4-1), the connecting shaft (3-1) is slidably connected to the long slot (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 integral pin (5-1) matched with the complementary notch (4-2).

2. The motorized anastomosis device transmission mechanism of claim 1, wherein: The rotating arm (4) is provided with a fixed pin (4-3) rotatably connected to the anastomat body (1).

3. The motorized anastomosis device transmission mechanism of claim 1, wherein: The upper top of the complementary notch (4-2) is in the shape of a circular arc, and the lower side opening is further provided with a circular arc hook; the integral pin (5-1) is a convex block with a cross section greater than one-half of a circle.

4. The motorized anastomosis device transmission mechanism of claim 2, wherein: The distance L2 between the integral 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 motorized anastomosis device transmission mechanism of claim 1, wherein: The top of the straight push rod (5) is inclined to the front side.

6. The electrically powered anastomosis device drive mechanism according to any one of claims 1-5, wherein: Further comprising a firing sensing unit A (7) arranged in the anastomat body (1), the rotating arm (4) is provided with a starting state sensing block A (4-4) and a termination 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 termination state sensing block A (4-5) is rotated to the sensing position of the firing sensing unit A (7).

7. The motorized anastomosis device transmission mechanism of claim 6, wherein: Further comprising a firing sensing device B (8) arranged at the handle of the anastomat body (1) and a firing sensing device C (9) arranged at the external sheath (2); The straight push rod (5) is provided with a starting state sensing block B (5-2), which is located at the sensing position of the firing sensing device B (8) before firing; The driver (3) is provided with a termination state sensing block C (3-2), which moves to the sensing position of the firing sensing device C (9) after firing.

Images