An eccentric shaft structure for a medical reciprocating saw handpiece

Abstract

An eccentric shaft structure of a medical reciprocating saw handpiece includes an eccentric shaft body, a bevel gear, a bearing, a left pressure block, a right pressure block and a locking screw. Compared with the prior art, the eccentric shaft structure of a medical reciprocating saw handpiece disclosed in the present invention has the following advantages: it can increase the working speed of the handpiece to achieve high-speed cutting, improve surgical efficiency, reduce heat and reduce accessory wear, and save a lot of trouble of frequent oiling and lubrication of the handpiece, and can reduce the external dimensions of the handpiece to facilitate operation in a small space. In addition, the left pressure block, the right pressure block and the screw can act as a flywheel after assembly, which can reduce vibration and improve the stability of the tool during reversing, which is beneficial to surgical safety.

Description

Technical Field

[0001] The invention relates to a medical reciprocating saw handpiece, in particular to an eccentric shaft structure of the medical reciprocating saw handpiece. Background Art

[0002] Medical reciprocating saw handpieces are commonly used tools for bone tissue cutting during surgical operations. The operating speed and dimensions of medical reciprocating saw handpieces are important indicators for judging whether the handpiece can achieve high-speed cutting and whether it can be flexibly operated in a narrow space.

[0003] Currently, the transmission mechanism of medical reciprocating saws typically utilizes a bevel gear set, with an eccentric shaft attached to one of the bevel gears driving a connecting rod to achieve the reciprocating cutting motion of the tool. As disclosed in Chinese patents CN201621421198.1, CN201510434434.7, and the accompanying drawings of CN201020248014.2, the central cylindrical diameter of the eccentric shaft in this structure is relatively large. If a bearing is installed on this cylindrical shaft before connecting it to the connecting rod hole, the associated bevel gear and housing would need to be increased in size. This increased housing size would make the medical reciprocating saw difficult to operate in confined spaces. Therefore, the eccentric shaft in this structure is typically connected to the connecting rod via a sliding sleeve. This structure is prone to wear and heat generation between the eccentric shaft and the sliding sleeve, and the rotational speed is low, requiring frequent lubrication.

[0004] Therefore, how to increase the rotation speed and reduce the size of a medical reciprocating saw mobile phone has become an important technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an eccentric shaft structure for a medical reciprocating saw handpiece, which can avoid the disadvantages of the transmission mechanism of the medical reciprocating saw handpiece under the prior art, thereby achieving the purpose of both increasing the rotation speed and reducing the overall size.

[0006] To achieve the above-mentioned objectives, the present invention is implemented through the following technical solutions: an eccentric shaft structure of a medical reciprocating saw mobile phone, comprising an eccentric shaft body, a bevel gear, a bearing, a left pressure block, a right pressure block and a locking screw, the eccentric shaft body and the bevel gear are nested and fixed together, the bearing is installed on the middle shaft of the eccentric shaft body, the left pressure block and the right pressure block are respectively provided with grooves that match the lower end shaft of the eccentric shaft body, and are tightly clamped on the lower end shaft of the eccentric shaft body by the locking screw, the end of the right pressure block is provided with a right pressure block shaft, the right pressure block shaft is coaxial with the upper end shaft of the eccentric shaft body and has an eccentricity with the middle axis of the eccentric shaft body.

[0007] Preferably, the diameter of the middle shaft of the eccentric shaft body is about 2 to 3 mm.

[0008] Preferably, the diameter of the upper end shaft of the eccentric shaft body and the right pressing block shaft at the right pressing block end is about 2 to 3 mm.

[0009] The beneficial results of the present invention are as follows: compared with the prior art, the advantages of a medical reciprocating saw mobile phone disclosed by the present invention are: it can increase the working speed of the mobile phone to achieve high-speed cutting, improve surgical efficiency, reduce heat and reduce wear of accessories, and save a lot of trouble of frequent oiling and lubrication of the mobile phone, and can reduce the external dimensions of the mobile phone to facilitate operation in a small space. In addition, the left pressure block, the right pressure block and the screw can act as a flywheel after assembly, which can reduce vibration and improve the stability of the tool during reversing, which is beneficial to surgical safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram of an eccentric shaft structure of a medical reciprocating saw handpiece according to an embodiment of the present invention;

[0011] Figure 2 This is an embodiment of the present invention Figure 1 BB cross-sectional view; DETAILED DESCRIPTION

[0012] To illustrate the technical content and structural features of the present invention in detail, the following is a further detailed description with reference to the embodiments and drawings.

[0013] The invention discloses an eccentric shaft structure for a medical reciprocating saw mobile phone, comprising an eccentric shaft body (1), a bevel gear (2), a bearing (3), a left pressure block (4), a right pressure block (5) and a locking screw (6); the eccentric shaft body (1) and the bevel gear (2) are nested and fixed together; the bearing (3) is installed on the middle shaft (102) of the eccentric shaft body (1); the left pressure block (4) and the right pressure block (5) are respectively provided with grooves that match the lower end shaft (103) of the eccentric shaft body (1) and are tightly clamped on the lower end shaft (103) of the eccentric shaft body (1) by the locking screw (6); the end of the right pressure block (5) is provided with a right pressure block shaft (501); the right pressure block shaft (501) is coaxial with the upper end shaft (101) of the eccentric shaft body (1) and has an eccentricity with the middle shaft (102) of the eccentric shaft body (1).

[0014] During processing, the rough-machined eccentric shaft body (1) can be pressed into the hole of the bevel gear (2) and fixed, and then the upper end shaft (101), the middle shaft (102) and the lower end shaft (103) are finely machined.

[0015] During assembly, the bearing (3) can be first installed into the connecting rod hole and fixed, and then the bearing (3) can be installed on the middle shaft (102), and then the left pressing block (4) and the right pressing block (5) can be installed and the boss surface can be closely attached to the bearing (3). Then, with the upper end shaft (101) as the reference, the right pressing block shaft (501) can be tested by the meter to ensure that the radial runout is qualified, and then the left pressing block (4) and the right pressing block (5) can be tightened and fixed with the locking screw (6).

Claims

1. An eccentric shaft structure of a medical reciprocating saw mobile phone, comprising an eccentric shaft body (1), a bevel gear (2), a bearing (3), a left pressure block (4), a right pressure block (5) and a locking screw (6), wherein the eccentric shaft body (1) and the bevel gear (2) are nested and fixed together, the bearing (3) is installed on the middle shaft (102) of the eccentric shaft body (1), the left pressure block (4) and the right pressure block (5) are respectively provided with grooves that match the lower end shaft (103) of the eccentric shaft body (1), and are tightly clamped on the lower end shaft (103) of the eccentric shaft body (1) by the locking screw (6), the end of the right pressure block (5) is provided with a right pressure block shaft (501), the right pressure block shaft (501) is coaxial with the upper end shaft (101) of the eccentric shaft body (1) and has an eccentricity with the middle shaft (102) of the eccentric shaft body (1), The diameter of the middle shaft (102) of the eccentric shaft body (1) is 2 mm. The diameter of the upper end shaft (101) of the eccentric shaft body (1) and the right pressing block shaft (501) at the end of the right pressing block (5) is 2 mm.

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