CN109833075B - an oscillating saw - Google Patents

Abstract

An oscillating saw includes a housing, a driving shaft, a driven shaft, a connecting rod, a swing shaft, and a tool holding device installed at the end of the swing shaft. The tail and middle parts of the driving shaft are respectively provided with a power input interface and A first gear, a second gear meshing with the first gear is provided in the middle of the driven shaft, and a first eccentric shaft is connected to one end of the connecting rod through a bearing at the end of the driven shaft, The other end of the connecting rod is connected to the second eccentric shaft at the tail of the swing shaft through a bearing. The invention overcomes the shortcomings of the transmission structure of the existing oscillating saw, and provides an oscillating saw that reduces noise, reduces vibration, improves the movement accuracy of the saw blade, increases the rotation speed, reduces heat, ensures smooth operation, and improves safety during surgery.

Description

an oscillating saw

Technical field

The present invention relates to a medical surgical instrument device, and in particular to an oscillating saw.

Background technique

The oscillating saw is a commonly used tool for cutting bone tissue in surgery. It needs to be able to cut bone tissue quickly and accurately. The common problems of oscillating saws at present are high noise, large vibration, low blade movement accuracy, and low speed. , severe fever, unstable operation, poor safety during surgery, and adverse effects on patients.

In the prior art, the transmission mechanism of the oscillating saw usually uses an eccentric sleeve to press the inner wall of the swing groove to complete the oscillating cutting, such as what is disclosed in the drawings of Chinese patents CN200720063571.5 and CN02226669.0, taking CN02226669.0 as an example. Analyze the disadvantages of this transmission mechanism: During the rotation of the rear shaft, the distance between the eccentric shaft at its end and the center of the front shaft changes greatly. According to the lever principle, the instantaneous cutting speed of the tool and the force provided by the drive motor to the saw blade The cutting torque will also fluctuate accordingly, causing the swing saw to run unevenly; in addition, the eccentric shaft, eccentric bushing and chute of this swing saw are relatively easy to wear, generate serious heat during operation, and the front axle swings to both sides. Impact noise and vibration will be generated when reversing. At the same time, the impact generated during reversing will also cause the saw blade to beat, resulting in low precision of saw blade movement and posing safety risks. This kind of swing saw has a low rotational speed, which reduces surgical efficiency.

Therefore, how to reduce noise and vibration of an oscillating saw, improve the movement accuracy of the saw blade, increase the rotation speed, reduce heat, ensure smooth operation, and improve safety during surgery has become an important technical issue that technicians in this field need to solve urgently.

Contents of the invention

In view of this, the present invention provides an oscillating saw that can avoid the disadvantages caused by the transmission mechanism of the oscillating saw in the prior art, thereby reducing noise, reducing vibration, improving the movement accuracy of the saw blade, increasing the rotation speed, reducing heat, and ensuring The purpose is to operate smoothly and improve safety during surgery.

In order to achieve the above objects, the present invention is achieved through the following technical solutions: an oscillating saw, including a housing, a driving shaft, a driven shaft, a connecting rod, a swing shaft, and a tool holding device installed at the end of the swing shaft, The tail and middle parts of the driving shaft are respectively provided with a power input interface and a first gear. The middle part of the driven shaft is provided with a second gear meshing with the first gear. The end part of the driven shaft is provided with a power input interface and a first gear. The first eccentric shaft is connected to one end of the connecting rod through a bearing, and the other end of the connecting rod is connected to the second eccentric shaft at the tail of the swing shaft through a bearing.

Preferably, the shell includes a front shell, a front piece of the middle shell, a rear piece of the middle shell, and a rear shell. The front shell, the front piece of the middle shell, the rear piece of the middle shell, and the rear shell are nested together in sequence. There is a first cavity between the front shell and the front piece of the middle shell that can make way for the connecting rod when it moves. There is a first cavity between the front piece of the middle shell and the back piece of the middle shell that can make way for the first gear and the second gear. The gear gives way to the second cavity, and the swing shaft is installed inside the front housing.

Preferably, the tool holding device includes a blade-face clamping lip provided at the front end of the swing shaft and a locking sleeve capable of locking the blade-face clamping lip.

Beneficial results of the present invention: Compared with the existing technology, the advantages of the oscillating saw disclosed in the present invention are: reducing noise, reducing vibration, improving the movement accuracy of the saw blade, increasing the rotation speed, reducing heat, ensuring smooth operation, and improving the surgical process. security in.

Description of drawings

Figure 1 is a perspective view of an oscillating saw with part of the casing removed according to a preferred embodiment of the present invention;

Figure 2 is an exploded view of an oscillating saw according to a preferred embodiment of the present invention;

Figure 3 is a perspective view of a cutter used by an oscillating saw according to a preferred embodiment of the present invention;

Detailed ways

In order to explain the technical content and structural features of the present invention in detail, further detailed description is provided below in conjunction with the embodiments and drawings.

An oscillating saw includes a housing (1), a driving shaft (2), a driven shaft (3), a connecting rod (4), a swing shaft (5), and a tool holder installed at the end of the swing shaft (5) A holding device (6) is provided with a power input interface (201) and a first gear (202) at the tail and middle parts of the driving shaft (2), and a power input interface (201) and a first gear (202) are provided at the middle part of the driven shaft (3). A second gear (301) meshes with a gear (202). The end of the driven shaft (3) is provided with a first eccentric shaft (302) connected to one end of the connecting rod (4) through a bearing (401). , the other end of the connecting rod (4) is connected to the second eccentric shaft (501) at the tail of the swing shaft (5) through a bearing (402).

When in use, insert the saw handle (701) of the tool (7) into the clamping lip (502) at the front end of the swing shaft (5), lock the locking sleeve (601), and start the power connection with the tail of the driving shaft (2). A drive motor connected to the input interface (201). The rotation of the drive motor drives the driving shaft (2) to rotate. The driving shaft (2) drives the driven shaft (3) to rotate through gear meshing. The driven shaft (3) passes through its end. The first eccentric shaft (302) triggers the connecting rod (4) to drive the swing shaft (5) to swing back and forth, and the swing shaft (5) drives the cutter (7) fixed at its front end to swing back and forth to achieve cutting.

Claims (3)

1. An oscillating saw, characterized in that it includes a housing (1), a driving shaft (2), a driven shaft (3), a connecting rod (4), a swing shaft (5), and a swing shaft (5) installed on the swing shaft (5). ) end of the tool clamping device (6), the tail and middle of the driving shaft (2) are respectively provided with a power input interface (201) and a first gear (202), and the middle part of the driven shaft (3) There is a second gear (301) meshing with the first gear (202), and the end of the driven shaft (3) is provided with a third gear connected to one end of the connecting rod (4) through a bearing (401). An eccentric shaft (302), the other end of the connecting rod (4) is connected to the second eccentric shaft (501) at the tail of the swing shaft (5) through a bearing (402). 2. An oscillating saw according to claim 1, characterized in that the housing (1) includes a front housing (101), a front piece of the middle housing (102), a rear piece of the middle housing (103), and a rear housing. (104), the front shell (101), the front piece of the middle shell (102), the rear piece of the middle shell (103), and the rear shell (104) are nested together in sequence. The front shell (101) and the middle shell There is a first cavity (1001) between the front pieces (102) that can give way to the connecting rod (4) when it moves, and between the front piece (102) of the middle shell and the rear piece (103) of the middle shell. There is a second cavity (1002) that can make way for the first gear (202) and the second gear (301). The swing shaft (5) is installed inside the front housing (101). 3. An oscillating saw according to claim 1, characterized in that the tool clamping device (6) includes a blade surface clamping lip (502) provided at the front end of the swing shaft (5) and a blade capable of holding the blade. The locking sleeve (601) is locked with the clamping lip (502).