CN219763486U - Power transmission mechanism of medical reciprocating grinding tool and medical reciprocating grinding tool - Google Patents

Abstract

The utility model relates to a power transmission mechanism of a medical reciprocating grinding tool and the medical reciprocating grinding tool, wherein the power transmission mechanism of the medical reciprocating grinding tool comprises: the device comprises an input shaft, an output shaft and a reciprocating mechanism, wherein the reciprocating mechanism is used for converting one-direction rotary motion of the input shaft into reciprocating rotary motion of the output shaft; the front end of the input shaft is eccentrically provided with an input driving part, and the rear end of the output shaft is eccentrically provided with an output driving part; the reciprocating mechanism comprises a supporting shaft and a swingable transmission shifting fork arranged on the supporting shaft, wherein the input end of the transmission shifting fork is in transmission fit with the input driving part and used for converting the rotation motion of the input shaft into the reciprocating swing of the transmission shifting fork, and the output end of the transmission shifting fork is in transmission fit with the output driving part and used for driving the output shaft to rotate reciprocally. The power transmission mechanism of the medical reciprocating grinding tool and the medical reciprocating grinding tool have the advantages of simple and convenient assembly of the reciprocating structure and low manufacturing difficulty.

Description

Power transmission mechanism of medical reciprocating grinding tool and medical reciprocating grinding tool

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a power transmission mechanism of a medical reciprocating grinding tool and the medical reciprocating grinding tool.

Background

In surgery, a medical grinding tool is generally used for grinding bone tissue or soft tissue in a human body, and the existing grinding tool generally adopts a power handle to drive a grinding head/tool bit to rotate at a high speed for grinding. Because the grinding heads/tool heads do 360-degree circular rotation, soft tissues are damaged when hard bone tissues are ground, and meanwhile, the soft tissues are more easily wound on the inner cutter tube of the drill and mill, so that the cutter tube is blocked and the soft tissues are further damaged.

In order to solve the above-mentioned problems, a medical reciprocating grinding tool in which a grinding head/bit can be reciprocally rotated clockwise and counterclockwise, which converts unidirectional rotational motion of a motor into reciprocal rotational motion of the grinding head/bit through a power transmission mechanism, has been developed in the prior art. However, the existing power transmission mechanism is a crank rocker mechanism, and has the problems of complex structure, high assembly difficulty and adverse processing and manufacturing.

Disclosure of Invention

Accordingly, it is necessary to provide a power transmission mechanism for a medical reciprocating grinding tool and a medical reciprocating grinding tool, which solve the problems that the assembling difficulty of the medical reciprocating grinding tool is high and the manufacturing is not easy due to the complicated structure of the power transmission mechanism.

A power transmission mechanism for a medical reciprocating grinding tool, comprising: a housing; an input shaft having an input end and an output end, the axis of the output end being parallel to the axis of the input end, the input end being for receiving external power and being driven to rotate the input shaft in one direction; the reciprocating mechanism comprises a supporting shaft, a transmission shifting fork and an output shaft, one end of the transmission shifting fork is pivoted in the shell through the supporting shaft, a driving part is arranged at the other end of the transmission shifting fork, the rear end of the driving part is connected with the output end of the input shaft, the front end of the driving part is connected with the output shaft, and the rotation motion of the input shaft is converted into the reciprocating motion of the output shaft around the axis of the output shaft through the transmission shifting fork.

By adopting the structure, the power transmission mechanism of the medical reciprocating grinding tool simplifies the structure of the power transmission mechanism of the reciprocating grinding tool, reduces the assembly difficulty and is convenient for processing and manufacturing the medical reciprocating grinding tool.

In one embodiment, an input groove is formed in the rear end of the driving part, the output end of the input shaft is located in the input groove, and the outer side wall of the output end is matched with the inner side wall of the input groove; the front end of the driving part is provided with an output groove, one end of the output shaft is positioned in the output groove, and the outer side wall of one end of the output shaft positioned in the output groove is matched with the inner side wall of the output groove.

In one embodiment, one end of the transmission fork is provided with an axially penetrating through hole, the through hole forms the driving part, and a spacer is arranged on the inner wall of the through hole and divides the driving part into the input groove and the output groove.

In one embodiment, an input bearing is sleeved at the output end of the input shaft, an inner ring of the input bearing is sleeved at the outer wall of the output end, and an outer ring of the input bearing is abutted with the inner wall of the input groove; the output shaft sleeve is provided with an output bearing, the inner ring of the output bearing is sleeved on the outer wall of the output shaft, and the outer ring of the output bearing is in butt joint with the inner wall of the output groove.

In one embodiment, two ends of the transmission shifting fork in the radial direction are arc-shaped, a shaft hole is formed in one end of the transmission shifting fork, which is not provided with the driving part, and the supporting shaft penetrates through the shaft hole.

In one embodiment, the front end of the shell is provided with a concave part, and the concave part is provided with a mounting hole for one end of the support shaft to pass through; the side wall of the shell is radially provided with a clamping groove, the other end of the supporting shaft is connected with a positioning piece, and the supporting shaft is fixedly connected with the shell through the positioning piece and the clamping groove.

In one embodiment, the positioning piece is in a fan shape, a supporting hole is formed in the top of the fan shape, one end, which is not connected with the mounting hole, of the supporting shaft penetrates through the supporting hole, and the circular arc portion at the bottom of the fan shape is clamped in the clamping groove.

In one embodiment, a support shaft bearing is sleeved outside the support shaft, and the support shaft bearing is abutted with the inner wall of the cavity of the shell.

In one embodiment, an oil-containing bearing is sleeved on the output shaft at the neck position of the front end of the shell, and an oil groove is formed in the output shaft at a position corresponding to the sleeved position of the oil-containing bearing.

A medical reciprocating grinding tool, comprising a tool bar, a grinding head and a power transmission mechanism as set forth in any one of the above; the rear end of the cutter bar is arranged in the shell in a penetrating way and is connected with the output shaft, the front end of the cutter bar is connected with the grinding head, and the grinding head is driven to reciprocate through the reciprocating motion of the output shaft.

Drawings

FIG. 1 is a schematic view of a medical reciprocating grinding tool according to an embodiment of the present utility model;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic cross-sectional view of FIG. 1;

FIG. 4 is a schematic perspective view of a transmission fork according to an embodiment of the present utility model;

fig. 5 is a schematic perspective view of a handle housing according to an embodiment of the utility model.

Reference numerals:

10. a handle housing;

11. a concave portion;

111. a mounting hole;

12. a clamping groove;

21. an input shaft;

211. an input driving section;

212. inputting a mandrel;

213. first bearing

22. An output shaft;

221. an output driving section;

222. outputting a mandrel;

223. an output bearing;

24. a support shaft;

25. a transmission fork;

251. an input groove;

252. an output groove;

253. a spacer;

254. a shaft hole;

26. a positioning piece;

27. a support shaft bearing;

28. an oil-impregnated bearing.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1 and 2, an embodiment of the present utility model provides a medical reciprocating grinding tool, comprising: a housing 10; a power transmission mechanism provided in the housing 10; the rear end of the cutter bar 30 is arranged in the shell 10 in a penetrating way, and a grinding head driving shaft is arranged in the cutter bar 30 and is connected with the power transmission mechanism; a grinding head 40 is mounted on the front end of the cutter bar 30 and is connected to the grinding head drive shaft. The power transmission mechanism is used for accessing external power, and drives the power transmission mechanism to rotate through the external power, and the power transmission mechanism drives the grinding head driving shaft in the cutter bar 30 to rotate in a reciprocating manner (positive and negative rotation), so that the grinding head 40 is driven to rotate in a reciprocating manner to grind tissues.

In one embodiment, referring to fig. 2-4, the power transmission mechanism includes: an input shaft 21 rotating about an axis L1, an output shaft 22 rotating about an axis L2, and a reciprocating mechanism; the input shaft 21 receives an external driving force to rotate in one direction, the output shaft 22 is connected to a grinding head driving shaft in the cutter bar 30, and the reciprocating mechanism converts the one-directional rotation of the input shaft 21 into the reciprocating motion of the output shaft 22, thereby reciprocating the grinding head. Specifically, the front end of the input shaft 21 is eccentrically provided with an input drive portion 211 that rotates about the axis L3, and the rear end of the output shaft 22 is eccentrically provided with an output drive portion 221 that rotates about the axis L4; the reciprocating mechanism comprises a supporting shaft 24 swinging around an axis L5 and a swingable transmission shifting fork 25 arranged on the supporting shaft, wherein the input end of the transmission shifting fork 25 is in transmission fit with the input driving part 211, the rotation motion of the input shaft 21 is converted into the reciprocating swing of the transmission shifting fork 25 around the axis L5, and the output end of the transmission shifting fork 25 is in transmission fit with the output driving part 221 to drive the output shaft 22 to rotate reciprocally around the axis L2.

The power transmission mechanism of the embodiment simplifies the existing structure, reduces the assembly difficulty and improves the processing and manufacturing efficiency.

The axes L1-L5 in the embodiment are mutually parallel, so that the internal transmission efficiency and the stability of the medical reciprocating grinding tool are improved.

Fig. 4 is a schematic perspective view of a transmission fork according to an embodiment of the utility model. Referring to fig. 3 and 4, the input end of the transmission fork 25 is provided with an elongated input groove 251, the input driving part 211 is positioned in the input groove 251, and the outer side wall of the input driving part 211 is matched with the inner side wall of the input groove 251; the output end of the transmission shifting fork 25 is provided with an elongated output groove 252, the output driving part 221 is positioned in the output groove 252, and the outer side wall of the output driving part 221 is matched with the inner side wall of the output groove 252.

In one embodiment, the input driving part 211 comprises an input mandrel 212 and a first bearing 213 sleeved on the input mandrel, and the input driving part 211 is matched with the inner side wall of the input groove 251 through the first bearing 213; the output driving part 221 comprises an output mandrel 222 and an output bearing 223 sleeved on the output mandrel, and the output driving part 221 is matched with the inner side wall of the output groove 252 through the output bearing 223.

In an embodiment of the present utility model, two ends of the transmission fork 25 in the length direction are arc-shaped, so that the transmission fork 25 has enough movable space in the limited space in the accommodating cavity of the housing 10; a key slot extends through the body of the drive fork 25, with an input recess 251 at one end and an output recess 252 at the other end. The inner wall of the key groove may be provided with a spacer 253, and the spacer 253 divides the input groove 251 and the output groove 252 to prevent interference during rotation of the two. Preferably, the spacer 253 is an integrally formed rib extending from the inner wall of the keyway to reduce assembly components.

The transmission fork (the lower end of the transmission fork 25 main body) on one side in the longitudinal direction of the input groove 251 and the output groove 252 is provided with a shaft hole 254 through which the support shaft 24 passes.

Preferably, the outer wall of the circular arc at the lower end of the main body of the transmission fork 25, which corresponds to the shaft hole 254, is slightly pointed, so that when the input driving part 211 of the input shaft 21 rotationally drives the transmission fork 25 to rotationally swing around the supporting shaft 24, the outer wall of the lower end of the main body of the transmission fork 25 interferes with the inner wall of the internal accommodating cavity of the casing 10, and thus the transmission fork 25 swings more smoothly.

Fig. 5 is a schematic perspective view of a handle housing according to an embodiment of the utility model. Referring to fig. 1 to 5, the front end of the housing 10 is provided with a recess 11, the recess 11 is provided with a mounting hole 111 through which one end of the support shaft 24 passes, and one end of the support shaft 24 passes through a shaft hole 254 of the transmission fork 25 and then passes into the mounting hole 111; the side wall of the shell 10 is provided with a clamping groove 12, and the other end of the supporting shaft 24 is clamped in the clamping groove 12 through a positioning piece 26 so as to position the supporting shaft in the shell 10 and simultaneously support a transmission shifting fork 25. The supporting shaft 24 is fixed on the casing 10, the casing 10 cannot rotate due to rotation of the input shaft, and the supporting shaft 24 can support the transmission fork 25, so that the rotation motion of the input shaft can be converted into reciprocating swing of the transmission fork 25, and further the reciprocating swing of the grinding head connected with the output shaft is realized; meanwhile, when the transmission fork 25 reciprocates around the support shaft 24 due to the rotation of the input shaft 21, vibration during the entire tool swinging process can be reduced by the support shaft 24.

In one embodiment, the positioning piece 26 is in a fan shape, a supporting hole is formed in the top of the fan shape, the positioning piece 26 is sleeved on the other end of the supporting shaft 24, which does not pass through the mounting hole 111, and the arc portion of the bottom of the fan shape is clamped in the clamping groove 12, so that the supporting shaft 24 is supported and positioned through the positioning piece 26.

In one embodiment, the support shaft 24 is sleeved with a support shaft bearing 27, the support shaft bearing 27 is located between the mounting hole 111 and the positioning piece 26, the outer wall of the support shaft bearing is abutted against the inner wall of the shell 10, and the support shaft 24 is firmly positioned in the shell 10 through the support shaft bearing 27 and the positioning piece 26.

In one embodiment, the oil bearing 28 is sleeved on the output shaft 22 at the neck position of the front end of the housing 10, and the oil groove is arranged at the position of the output shaft 22 corresponding to the sleeved oil bearing 28, so that the abrasion in the rotation process of the output shaft 22 is reduced, and the rotation smoothness is improved.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A power transmission mechanism for a medical reciprocating grinding tool, comprising:

a housing;

an input shaft having an input end and an output end, the axis of the output end being parallel to the axis of the input end, the input end being for receiving external power and being driven to rotate the input shaft in one direction;

the reciprocating mechanism comprises a supporting shaft, a transmission shifting fork and an output shaft, one end of the transmission shifting fork is pivoted in the shell through the supporting shaft, a driving part is arranged at the other end of the transmission shifting fork, the rear end of the driving part is connected with the output end of the input shaft, the front end of the driving part is connected with the output shaft, and the rotation motion of the input shaft is converted into the reciprocating motion of the output shaft around the axis of the output shaft through the transmission shifting fork.

2. The power transmission mechanism of the medical reciprocating grinding tool according to claim 1, wherein an input groove is formed in the rear end of the driving part, the output end of the input shaft is positioned in the input groove, and the outer side wall of the output end is matched with the inner side wall of the input groove; the front end of the driving part is provided with an output groove, one end of the output shaft is positioned in the output groove, and the outer side wall of one end of the output shaft positioned in the output groove is matched with the inner side wall of the output groove.

3. The power transmission mechanism of a medical reciprocating grinding tool according to claim 2, wherein one end of the transmission fork has an axially penetrating through hole forming the driving part, and a spacer is provided at an inner wall of the through hole, the spacer dividing the driving part into the input groove and the output groove.

4. The power transmission mechanism of the medical reciprocating grinding tool according to claim 2, wherein an input bearing is sleeved at the output end of the input shaft, an inner ring of the input bearing is sleeved at the outer wall of the output end, and an outer ring of the input bearing is abutted with the inner wall of the input groove; the output shaft sleeve is provided with an output bearing, the inner ring of the output bearing is sleeved on the outer wall of the output shaft, and the outer ring of the output bearing is in butt joint with the inner wall of the output groove.

5. The power transmission mechanism of the medical reciprocating grinding tool according to claim 2, wherein both ends of the transmission fork in the radial direction are arc-shaped, a shaft hole is formed in one end of the transmission fork, which is not provided with a driving part, and the support shaft is penetrated in the shaft hole.

6. The power transmission mechanism of the medical reciprocating grinding tool according to claim 1, wherein a recess is provided at a front end of the housing, the recess being provided with a mounting hole through which one end of the support shaft passes; the side wall of the shell is radially provided with a clamping groove, the other end of the supporting shaft is connected with a positioning piece, and the supporting shaft is fixedly connected with the shell through the positioning piece and the clamping groove.

7. The power transmission mechanism of the medical reciprocating grinding tool according to claim 6, wherein the positioning piece is in a fan shape, a supporting hole is formed in the top of the fan shape, one end of the supporting shaft, which is not connected with the mounting hole, penetrates through the supporting hole, and the circular arc portion of the bottom of the fan shape is clamped in the clamping groove.

8. The power transmission mechanism of the medical reciprocating grinding tool according to claim 7, wherein a support shaft bearing is sleeved outside the support shaft, and the support shaft bearing is abutted with the inner wall of the cavity of the housing.

9. The power transmission mechanism of the medical reciprocating grinding tool according to claim 1, wherein an oil-containing bearing is sleeved on the output shaft at the neck position of the front end of the shell, and an oil groove is arranged on the output shaft at a position corresponding to the sleeved position of the oil-containing bearing.

10. A medical reciprocating grinding tool comprising a tool bar, a grinding head, and the power transmission mechanism of any one of claims 1-9; wherein,,

the rear end of the cutter bar is arranged in the shell in a penetrating way and is connected with the output shaft, the front end of the cutter bar is connected with the grinding head, and the grinding head is driven to reciprocate through the reciprocating motion of the output shaft.