Medical electric fretsaw driven by double pendulums

Abstract

The invention discloses a double-pendulum transmission medical electric fret saw which comprises a shell, two motors, two swing rods, a fret saw blade, a motor driver and a controller, and the two motors are symmetrically installed in the shell; the two oscillating rods are respectively mounted on output shafts of the two motors and are symmetrically distributed; the two ends of the fret saw blade are fixed to the two swing rods correspondingly, and a fret saw blade body extends out of the shell. The motor driver and the controller are both installed in the shell, the two motors are electrically connected with the motor driver, and the motor driver is electrically connected with the controller. The two motors drive the two swing rods to move in the same direction, and then the fretsaw blade is driven to reciprocate left and right, so that contact friction cutting force is generated between the fretsaw blade and a bone to cut the bone; therefore, the situation that the fretsaw is clamped in an osteotomy seam in the osteotomy process or the fretsaw is broken in the osteotomy process due to improper manual force and direction is avoided, and the osteotomy operation can be stably, reliably and efficiently completed.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, and more particularly to a medical electric wire saw with a double pendulum transmission. Background Art

[0002] In orthopedic surgery, the target bone needs to be cut and separated in order to perform bone remodeling, fracture repair, joint replacement, etc. During the osteotomy process, different orthopedic surgical instruments are available for different parts of the bones, such as osteotome, bone rasp, wire saw, electric oscillating saw, electric grinding drill and ultrasonic bone knife. The existing osteotomy method generally involves exposing the target bone and then performing osteotomy from the outside of the bone toward the bone tissue from the outside to the inside. For example, when using an osteotome to perform osteotomy, a hammer is needed to be used to hit the osteotome to perform osteotomy. Before hammering, the contact between the surrounding soft tissue and the bone needs to be carefully observed. When the osteotome is about to cut the bone, the force of the hammer should be evaluated. Using too much force may directly penetrate the bone and damage important tissues such as surrounding soft tissue, nerves, and blood vessels. For example, there is a serious risk of overshoot during osteotomy using an electric oscillating saw, which may cause damage to the surrounding soft tissue, blood vessels, and nerves, and is not conducive to the postoperative recovery of patients. A wire saw is a tool that can perform osteotomy from the inside toward the bone tissue from the inside to the outside after exposing the target bone. The wire saw is placed below the bone to be cut and then performs an eccentric motion tightly around the bone from below, which means that it is impossible to jump or overshoot into the surrounding tissue during the cutting process.

[0003] However, the existing wire saws are usually operated manually, and during use, the wire saw may be easily stuck in the bone joint or broken due to improper pushing and pulling frequency, pulling force and wire saw angle between the left and right hands.

[0004] Therefore, providing a medical electric wire saw with a double pendulum transmission is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a medical electric wire saw with a double pendulum transmission, which can stably, reliably and efficiently complete the osteotomy operation.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A medical electric wire saw with a double-pendulum transmission comprises a housing, two motors, two swing arms, a wire saw blade, a motor driver and a controller, wherein the two motors are symmetrically mounted inside the housing; the two swing arms are respectively mounted on the output shafts of the two motors and are symmetrically distributed; the two ends of the wire saw blade are respectively fixed on the two swing arms, and the wire saw blade is located outside the housing or the wire saw blade body extends to the outside of the housing; the motor driver and the controller are both mounted inside the housing, the two motors are respectively electrically connected to the motor driver, and the motor driver is electrically connected to the controller.

[0008] By adopting the above technical solution, the beneficial effects of the present invention are:

[0009] Two motors drive two swing arms to move in the same direction, which in turn drives the wire saw blade to reciprocate left and right, thereby generating contact friction cutting force between the wire saw blade and the bone to perform osteotomy, thereby avoiding the wire saw getting stuck in the osteotomy bone gap or breaking during osteotomy due to improper manual force and direction, and the osteotomy operation can be completed stably, reliably and efficiently.

[0010] Furthermore, it also includes two fixed pulleys, which are symmetrically installed inside the shell and respectively contact the two outer side surfaces of the wire saw blade.

[0011] The beneficial effect of adopting the above further technical solution is that the position of the wire saw blade is limited during osteotomy.

[0012] Furthermore, a handle is provided on one side of the shell.

[0013] The beneficial effect of adopting the above further technical solution is that it is easy to hold during the osteotomy operation.

[0014] Furthermore, the swing arm and the motor output shaft, as well as the end of the wire saw blade and the swing arm are fixedly connected by screws.

[0015] Furthermore, the wire saw blade is made of nickel-titanium alloy.

[0016] The beneficial effect of adopting the above further technical solution is that it has good flexibility and fatigue resistance.

[0017] Furthermore, both of the two motors are DC motors.

[0018] Furthermore, it also includes a bone clamp, which includes a movable clamp body and a fixed clamp body, and the movable clamp body and the fixed clamp body are hinged through an axis; the shell has a slide groove; the slider at the extended end of the axis is slidably connected to the slide groove.

[0019] The beneficial effect of adopting the above further technical solution is that the bone clamp is integrated with the electric wire saw body to fix the bones, which is convenient for operation.

[0020] Furthermore, the tail end of the movable clamp body is provided with an arc-shaped pointed hook.

[0021] The beneficial effect of adopting the above further technical solution is that it can clamp the edge of the bone during the clamping process, making it more stable.

[0022] Furthermore, the movable jaw body is 2 cm longer than the fixed jaw body.

[0023] The beneficial effect of adopting the above further technical solution is that the fixation is more firm during the clamping process.

[0024] Furthermore, it also includes a wire saw guide, which includes a handle and a hook connected as one body, and the inside of the hook is hollow for the wire saw blade to penetrate.

[0025] The beneficial effect of adopting the above further technical solution is that it is used to accurately position the guide wire saw blade during orthopedic osteotomy surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0027] Figure 1 The accompanying drawing is a schematic structural diagram of a medical electric wire saw with a double pendulum transmission provided by the present invention in working state;

[0028] Figure 2 The accompanying drawing is a schematic diagram of the connection between the motor driver and the controller pins provided by the present invention;

[0029] Figure 3 The accompanying drawing is a schematic structural diagram of the wire saw guide provided by the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1-3 As shown, an embodiment of the present invention discloses a medical electric wire saw with a double-pendulum transmission, comprising a housing 1, two motors 2, two swing arms 3, a wire saw blade 4, a motor driver 5 and a controller 6. The two motors 2 are symmetrically mounted inside the housing 1. In the present embodiment, the motors 2 are all DC motors; the two swing arms 3 are respectively mounted on the output shafts of the two motors 2 and are symmetrically distributed. In the present embodiment, the two output shafts extend out of the housing 1, and correspondingly, the two swing arms 3 are both located outside the housing 1; both ends of the wire saw blade 4 are respectively fixed on the two swing arms 3, and the wire saw blade 4 is located outside the housing 1 or the main body of the wire saw blade 4 extends to the outside of the housing 1; the motor driver 5 and the controller 6 are both mounted inside the housing 1, the two motors 2 are respectively electrically connected to the motor driver 5, and the motor driver 5 is electrically connected to the controller 6. The present invention drives two swing arms 3 to move in the same direction through two motors 2, thereby driving the wire saw blade 4 to reciprocate left and right, thereby achieving contact friction cutting force between the wire saw blade 4 and the bone for osteotomy, thereby avoiding the wire saw being stuck in the osteotomy bone gap or breaking during osteotomy due to improper manual force and direction, and can complete the osteotomy operation stably, reliably and efficiently.

[0032] In order to further optimize the technical solution of the present invention, two fixed pulleys 7 are also included. The two fixed pulleys 7 are symmetrically installed inside the housing 1 and are in contact with the two outer side surfaces of the wire saw blade 4 respectively, so as to limit the position of the wire saw blade 4 during bone cutting.

[0033] In order to further optimize the technical solution of the present invention, a handle 11 is provided on one side of the housing 1 for easy holding during the osteotomy operation.

[0034] Specifically, the swing arm 3 and the output shaft of the motor 2 , as well as the end of the wire saw blade 4 and the swing arm 3 are fixedly connected by screws.

[0035] In order to further optimize the technical solution of the present invention, the wire saw blade 4 is made of nickel-titanium alloy, which has good flexibility and fatigue resistance.

[0036] In this embodiment, the motor driver 5 receives the control level from the controller 6 through the four pins IN1, IN2, IN3, and IN4 to control the forward and reverse rotation of the motor 2. The motor driver 5 has ENA and ENB enable terminals, which are connected to the controller 6 to control the speed of the two motors 2 (the first motor and the second motor). The control logic of the two swing arms 3 is shown in the following table.

[0037]

[0038] The swing control of the swing lever 3 is divided into three actions: forward transmission, reverse transmission and stop, corresponding to the three motion states of the electric wire saw: left transmission, right transmission and stop.

[0039] ① The two swing arms 3 rotate forward at the same time, corresponding to the first motor and the second motor rotating forward at the same time, IN1 and IN3 in the motor driver 5 are at high level, IN2 and IN4 are at low level, and the enable terminals (ENA and ENB) in the motor driver 5 are both at high level, and the wire saw blade 4 is transmitted to the left at this time;

[0040] ② The two swing arms 3 reverse at the same time, corresponding to the first motor and the second motor reverse at the same time, IN1 and IN3 in the motor driver 5 are low level, IN2 and IN4 are high level, the enable terminals (ENA and ENB) in the motor driver 5 are both high level, and the wire saw blade 4 is driven to the right;

[0041] ③ The two swing arms 3 stop at the same time, correspondingly the first motor and the second motor stop at the same time, IN1, IN2, IN3 and IN4 in the motor driver 5 are all at low level, the enable terminals (ENA, ENB) in the motor driver 5 are all at high level, and the wire saw blade 4 stops transmission.

[0042] Specifically, the circuit in the motor driver 5 adopts an H-bridge circuit, and the two DC circuit steering (forward, reverse and stop) control adopts two H circuits, and each H-bridge circuit includes four switches and four transistors.

[0043] Specifically, the speeds of the two motors 2 are controlled by the duty cycle of the PWM wave. The rotation speed of the motor 2 is controlled to control the speed of the two swing arms 3, and then the bone cutting speed of the wire saw is controlled. The duty cycle values ​​of the two motors 2 are equal.

[0044] Specifically, the controller 6 implements the output of PWM waves through a timer / counter module, and the speed regulation of the two motors 2 requires two timers to generate two PWM waves with the same duty cycle.

[0045] Specifically, it also includes a bone clamp, which includes a movable clamp body and a fixed clamp body, and the movable clamp body and the fixed clamp body are hinged by an axis; the shell 1 has a slide groove; the slider at the extended end of the axis is slidably connected to the slide groove, so that the bone clamp is integrated with the electric wire saw body for fixing bones, which is convenient for operation.

[0046] In order to further optimize the technical solution of the present invention, an arc-shaped pointed hook is provided at the tail end of the movable clamp body, which plays a role in clamping the edge of the bone during the clamping process, making it possible to clamp more stably.

[0047] In order to further optimize the technical solution of the present invention, the movable clamp body is 2 cm longer than the fixed clamp body, so that it is more firmly fixed during the clamping process.

[0048] Specifically, the wire saw guide 8 is also included. The wire saw guide 8 includes a handle 81 and a hook 82 which are connected as one body. The hook 82 is hollow inside for the wire saw blade 4 to penetrate, and is used for guiding the wire saw blade 4 to accurately position during orthopedic osteotomy surgery.

[0049] The embodiment of the present invention also discloses a method for osteotomy using the above-mentioned medical electric wire saw with double pendulum transmission, and the specific steps are as follows:

[0050] 1) First, adjust the position of the bone clamp in the slide slot and clamp the cut bone with the bone clamp to prevent the bone tissue from swinging randomly during the cutting process;

[0051] 2) The wire saw blade 4 is then inserted into the hollow hook 82, which is inserted along the bone side through the surgical incision, and then the wire saw guide 8 is rotated around the bone to be pulled out, so that the wire saw blade 4 passes through the lower part of the cut bone;

[0052] 3) The two ends of the wire saw blade 4 are fixedly connected to the two swing rods 3 by screws;

[0053] 4) During the osteotomy process, one hand holds the handle 11 and places the wire saw blade 4 close to the osteotomy part. Then the other hand holds the movable clamp body and the fixed clamp body handle to clamp the osteotomy bone. The wire saw blade 4 rubs against the bone as the two swing bars 3 swing in the same direction to generate osteotomy force. During the osteotomy process, the swing speed of the swing bar 3 remains constant. Hold the handle 11 and pull it up while cutting the osteotomy. During the osteotomy, inject physiological saline along the edge of the wire saw blade 4 to cool the heat generated during the osteotomy process and reduce the thermal damage caused by mechanical bone cutting until the osteotomy is completed.

[0054] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0055] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A medical electric wire saw with double pendulum transmission, characterized in that: It comprises a housing, two motors, two swinging rods, a wire saw blade, a motor driver and a controller, wherein the two motors are symmetrically mounted inside the housing; the two swinging rods are respectively mounted on the output shafts of the two motors and are symmetrically distributed; the two ends of the wire saw blade are respectively fixed on the two swinging rods, and the wire saw blade is located outside the housing or the wire saw blade body extends outside the housing; The motor driver and the controller are both installed inside the housing, the two motors are electrically connected to the motor drivers respectively, and the motor driver is electrically connected to the controller.

2. A medical electric wire saw with double pendulum transmission according to claim 1, characterized in that: It also includes two fixed pulleys, which are symmetrically installed inside the shell and respectively contact the two outer side surfaces of the wire saw blade.

3. A medical electric wire saw with double pendulum transmission according to claim 1 or 2, characterized in that: A handle is provided on one side of the shell.

4. The medical electric wire saw with double pendulum transmission according to claim 3, characterized in that: The swing arm and the motor output shaft, as well as the end of the wire saw blade and the swing arm are fixedly connected by screws.

5. The medical electric wire saw with double pendulum transmission according to claim 3, characterized in that: The wire saw blade is made of nickel-titanium alloy.

6. The medical electric wire saw with double pendulum transmission according to claim 3, characterized in that: Both of the motors are DC motors.

7. The medical electric wire saw with double pendulum transmission according to claim 1, characterized in that: It also includes bone clamps, which include a movable clamp body and a fixed clamp body, and the movable clamp body and the fixed clamp body are hinged through a shaft; the shell has a slide groove; the slider at the extended end of the shaft is slidably connected to the slide groove.

8. The medical electric wire saw with double pendulum transmission according to claim 7, characterized in that: The tail end of the movable clamp body is provided with an arc-shaped pointed hook.

9. The medical electric wire saw with double pendulum transmission according to claim 7, characterized in that: The movable clamp body is 2 cm longer than the fixed clamp body.

10. The medical electric wire saw with double pendulum transmission according to claim 1, characterized in that: The utility model also comprises a wire saw guide, wherein the wire saw guide comprises a handle and a hook which are connected as one body, and the inside of the hook is hollow for the wire saw blade to penetrate.

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