CN219594723U - Minimally invasive medical swing saw - Google Patents

Abstract

The utility model relates to a minimally invasive medical pendulum saw, comprising: the saw blade comprises a cutter bar, a saw blade capable of swinging, a driving shaft of an eccentric driving part, a shifting fork capable of swinging reciprocally around a first rotating shaft, an input end of the shifting fork is in transmission connection with the eccentric driving part, an output end of the shifting fork is in transmission connection with a connecting end of the saw blade, the shifting fork is driven to swing reciprocally around the first rotating shaft through the eccentric driving part, and the shifting fork is driven to swing reciprocally around the saw blade. Through setting up the shift fork at drive shaft and saw bit, and the input of shift fork is less than the output of shift fork and the distance of first pivot rather than revoluting wobbling, and the shift fork forms a double lever mechanism with the saw bit, has realized having increased the swing angle of saw bit under the circumstances of not increasing cutter arbor inner space to guarantee the stability of saw bit motion, improved the security of operation.

Description

Minimally invasive medical swing saw

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a minimally invasive medical pendulum saw.

Background

In orthopaedics surgery, the pendulum saw is a common tool for sawing bones, and generally comprises a saw blade and a main machine, wherein a power source and a transmission mechanism are arranged in the main machine, the input end of the transmission mechanism is connected with the power source, the output end of the transmission mechanism is connected with the saw blade, and the saw blade is driven to perform high-frequency reciprocating swing through the transmission mechanism so as to cut bone tissues.

The existing swing saw is generally applied to an open operation of orthopaedics, and for the minimally invasive orthopaedics operation, the existing swing saw cannot be applied to the minimally invasive orthopaedics operation due to the narrow space of an operation channel.

Disclosure of Invention

Based on the above, it is necessary to provide a minimally invasive medical swing saw for solving the problem that the swing saw cannot be applied to minimally invasive orthopedic surgery.

A minimally invasive medical pendulum saw, comprising: the cutter bar is of a hollow structure penetrating along the axial direction; a swingable saw blade having a saw tooth end and a connecting end, the connecting end of the saw blade being disposed in the cutter bar, the saw tooth end of the saw blade extending out of the cutter bar; a driving shaft which is arranged in the cutter bar, can be driven and rotates around the central axis of the driving shaft, and is provided with an eccentric driving part at the front end; the shifting fork is pivoted in the cutter bar through a first rotating shaft and can swing reciprocally around the first rotating shaft, the shifting fork is provided with an input end and an output end, the input end of the shifting fork is in transmission connection with the eccentric driving part, and the output end of the shifting fork is in transmission connection with the connecting end of the saw blade; the eccentric driving part drives the shifting fork to swing reciprocally around the first rotating shaft, and the shifting fork drives the saw blade to swing reciprocally.

According to the minimally invasive medical pendulum saw, as the saw blade, the driving shaft and the shifting fork are contained in the cutter bar, the volume of the whole pendulum saw is greatly reduced, and the minimally invasive medical pendulum saw can enter a narrow operation channel in space, so that the minimally invasive medical pendulum saw can be used for minimally invasive orthopedic operations.

In one embodiment, the distance between the input end of the shift fork and the first rotating shaft is smaller than the distance between the output end of the shift fork and the first rotating shaft.

In one embodiment, the input end of the shifting fork is provided with an input groove, and the outer side wall of the driving part is matched with the inner side wall of the input groove.

In one embodiment, the eccentric driving part is sleeved with a first bearing, an inner ring of the first bearing is in contact with the outer wall of the eccentric driving part, and an outer ring of the first bearing is in contact with the inner wall of the shifting fork input end.

In one embodiment, the saw blade is pivoted in the cutter bar through a second rotating shaft, an output groove is formed in the output end of the shifting fork, the outer side wall of the connecting end is in transmission fit with the inner side wall of the output groove, and the reciprocating swing of the shifting fork drives the saw blade to swing reciprocally around the second rotating shaft.

In one embodiment, the distance between the connecting end of the saw blade and the second rotating shaft is smaller than the distance between the sawtooth end of the saw blade and the second rotating shaft.

In one embodiment, the central axis of the first rotating shaft and the central axis of the second rotating shaft are located on the central axis of the driving shaft.

In one embodiment, the fork is of a sheet structure, and the width of the input end of the fork is greater than the width of the output end.

In one embodiment, the minimally invasive medical pendulum saw further comprises a housing, the cutter bar is fixedly connected to the front end of the housing, one end of the driving shaft, which is far away from the eccentric driving part, penetrates through the cutter bar and stretches into the housing, a second bearing is sleeved on the outer wall of one end of the driving shaft, which is far away from the eccentric driving part, and the outer ring of the second bearing is in butt joint with the inner wall of the housing.

In one embodiment, a third bearing is sleeved at one end of the driving shaft, which is close to the eccentric driving part, and the outer ring of the third bearing is abutted against the inner wall of the cutter bar.

Drawings

FIG. 1 is a schematic cross-sectional view of a medical pendulum saw according to one embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1 at "A";

FIG. 3 is a schematic diagram of a shift fork of a transmission mechanism according to an embodiment of the present utility model;

fig. 4 is a schematic view of a saw blade of a transmission mechanism according to an embodiment of the present utility model.

Reference numerals:

1. a first rotating shaft;

2. a second rotating shaft;

10. a drive shaft;

11. an eccentric driving part;

12. a mandrel;

13. a bearing;

20. a saw blade;

21. a head;

22. saw teeth;

23. a first shaft hole;

30. a shifting fork;

31. an input groove;

32. a second shaft hole;

311. a first engagement portion;

312. a second engagement portion;

40. a housing;

50. a cutter bar;

51. a long rod;

52. and an end sleeve.

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.

Fig. 1 is a schematic cross-sectional view of a medical swing saw according to an embodiment of the present utility model, and fig. 2 is a partially enlarged view of fig. 1 at "a". Referring to fig. 1 and fig. 2, in one embodiment of the present utility model, a minimally invasive medical swing saw includes: the saw blade 20 is provided with a sawtooth end and a connecting end, the connecting end of the saw blade is arranged in the cutter bar 50, and the sawtooth end of the saw blade 20 extends out of the cutter bar 50; the driving shaft 10 is arranged in the cutter bar 50, can be driven and rotate around the central axis of the driving shaft, and the front end of the driving shaft 10 is provided with an eccentric driving part 11; the shifting fork 30 is pivoted in the cutter bar 50 through a first rotating shaft and can swing reciprocally around the first rotating shaft, the shifting fork 30 is provided with an input end and an output end, the input end of the shifting fork 30 is in transmission connection with the eccentric driving part 11, and the output end of the shifting fork 30 is in transmission connection with the connecting end of the saw blade 20; the eccentric driving part drives the shifting fork 30 to swing reciprocally around the first rotating shaft, and the shifting fork 30 drives the saw blade 20 to swing reciprocally, so that sawing of tissues is realized.

According to the minimally invasive medical pendulum saw provided by the embodiment of the utility model, as the saw blade, the driving shaft and the shifting fork are all accommodated in the cutter bar, the volume of the whole pendulum saw is greatly reduced, and the pendulum saw can enter a narrow operation channel in a space, so that the minimally invasive medical pendulum saw can be used for minimally invasive orthopedic operations.

In one embodiment, the distance of the input end from the first shaft 1 is smaller than the distance of the output end from the first shaft 1. Through setting up shift fork 30 between drive shaft 10 and saw bit 20, and the distance of shift fork 30's input and its revolute wobbling first pivot 1 is less than the distance of shift fork 30's output and first pivot 1, and the shift fork forms a double lever mechanism with the saw bit, has realized having increased the swing angle of saw bit 20 under the circumstances of not increasing the cutter arbor inner space to guarantee the stability of saw bit motion, improved the security of operation.

In one embodiment, the fork 30 is in the form of a plate, and the rotation axis of the first shaft 1 and the rotation axis of the second shaft 2 are perpendicular to the axis L of the drive shaft 10. On the one hand, the sheet structure of the fork 30 can reduce the occupied space; on the other hand, the driving force is effectively transmitted between the fork 30 and the saw blade 20, thereby ensuring that the saw blade 20 can swing along a preset movement path.

In one embodiment, the eccentric driving part 11 of the driving shaft 10 comprises a mandrel 12 and a bearing 13 sleeved on the mandrel, and abrasion between the mandrel 12 and the inner wall of the shifting fork can be reduced through the bearing 13. Specifically, the rotational axis of the spindle 12 is arranged eccentrically in the radial direction with respect to the rotational axis of the drive shaft 10, so that the eccentric drive 11 of the drive shaft constitutes an eccentric shaft.

In another embodiment, the eccentric drive 11 of the drive shaft 10 is an eccentric.

In one embodiment, the input end of the fork 30 is provided with an input groove 31, and the outer sidewall of the eccentric driving part 11 of the driving shaft 10 is engaged with the inner sidewall of the input groove 31.

Referring specifically to fig. 3, the input end of the fork 30 has a first engagement portion 311 and a second engagement portion 312, an input groove 31 is formed between the first engagement portion 311 and the second engagement portion 312, the first engagement portion 311 and the second engagement portion 312 are symmetrically provided at both sides of a central axis of the fork 30, and are respectively contacted with the first engagement portion 311 and the second engagement portion 312 when the eccentric driving portion 11 of the driving shaft 10 rotates, thereby causing the fork 30 to swing up and down about the second shaft 2.

In one embodiment, the input recess 31 is U-shaped.

In one embodiment, the output end of the fork 30 is provided with an output groove 32, the connecting end of the saw blade 20 is provided with a head 21, and the outer side wall of the head 21 of the saw blade 20 is matched with the inner side wall of the output groove 32 of the fork 30. Specifically, the output groove 32 of the fork 30 is circular arc-shaped, and the head 21 of the saw blade 20 is circular arc-shaped.

In another embodiment, the output end of the shift fork 30 is provided with a bayonet, the inner wall of the bayonet is arc-shaped, the connecting end of the saw blade 20 is provided with a clamping column, the clamping column is perpendicular to the plane of the saw blade 20, and the clamping column can be pressed into the bayonet, so that the shift fork 30 is more firmly connected with the saw blade 20, and the shift fork 30 is prevented from being separated from the saw blade 20 in the moving process.

In one embodiment, the width W1 of the input end of the fork 30 is greater than the width W2 of the output end of the fork 30, so that there is enough space between the output end of the fork 30 and the arbor of the saw to ensure that the swing angle of the input end of the fork 30 is greater than the swing angle of the output end of the fork 30.

In one embodiment, the connecting end of the saw blade 20 is spaced from the first rotational axis 1 less than the distance between the saw tooth end of the saw blade 20 and the first rotational axis 1. Specifically, the saw tooth end of the saw blade 20 includes saw teeth 22, the saw blade 20 includes a first shaft hole 23 through which the second rotation shaft 2 passes, and a distance between the first shaft hole 23 and the head 21 of the connection end of the saw blade 20 is smaller than a distance between the first shaft hole 23 and the saw teeth 22 of the saw tooth end of the saw blade 20, such that a swing angle of the saw tooth end of the saw blade 20 is larger than a swing angle of the connection end of the saw blade 20, referring to fig. 4 in particular.

In one embodiment, the rotation central axis L (fig. 2) of the driving shaft 10 and the central axis of the second shaft hole 32 of the shift fork 30, the central axis of the output groove 32 of the shift fork 30, the central axis of the head 21 of the saw blade 20 and the central axis of the first shaft hole 23 of the saw blade 20 are perpendicular to each other, so that the occupied space of the saw blade 20 and the shift fork 30 in the arbor of the pendulum saw can be reduced and the stability of the swing of the saw blade 20 and the shift fork 30 can be ensured.

Referring to fig. 1, the tool bar 50 of the present utility model includes a long bar 51 and an end sleeve 52, and the end sleeve 52 is sleeved on the head end of the long bar 51. The driving shaft 10 is positioned in the long rod 51, the coupling end of the saw blade 20 and the fork 30 are mounted in the end sleeve 52, and the saw blade 20 and the fork 30 are coupled to the end sleeve 52 by a shaft pin, respectively. Through the structure, the disassembly and assembly of the saw blade are convenient, and the production and installation efficiency of the swinging saw blade end 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 minimally invasive medical pendulum saw, comprising:

the cutter bar is of a hollow structure penetrating along the axial direction;

a swingable saw blade having a saw tooth end and a connecting end, the connecting end of the saw blade being disposed in the cutter bar, the saw tooth end of the saw blade extending out of the cutter bar;

a driving shaft which is arranged in the cutter bar, can be driven and rotates around the central axis of the driving shaft, and is provided with an eccentric driving part at the front end;

the shifting fork is pivoted in the cutter bar through a first rotating shaft and can swing reciprocally around the first rotating shaft, the shifting fork is provided with an input end and an output end, the input end of the shifting fork is in transmission connection with the eccentric driving part, and the output end of the shifting fork is in transmission connection with the connecting end of the saw blade;

the eccentric driving part drives the shifting fork to swing reciprocally around the first rotating shaft, and the shifting fork drives the saw blade to swing reciprocally.

2. The minimally invasive medical pendulum saw of claim 1, wherein the distance of the input end of the fork from the first rotational axis is less than the distance of the output end of the fork from the first rotational axis.

3. The minimally invasive medical pendulum saw of claim 1, wherein the input end of the fork is provided with an input groove, and the outer sidewall of the driving portion is mated with the inner sidewall of the input groove.

4. The minimally invasive medical pendulum saw of claim 3, wherein the eccentric drive portion is sleeved with a first bearing, an inner ring of the first bearing is in contact with an outer wall of the eccentric drive portion, and an outer ring of the first bearing is in contact with an inner wall of the fork input end.

5. The minimally invasive medical pendulum saw according to claim 1, wherein the saw blade is pivoted in the cutter bar through a second rotating shaft, an output end of the shifting fork is provided with an output groove, the outer side wall of the connecting end is in transmission fit with the inner side wall of the output groove, and the reciprocating swing of the shifting fork drives the saw blade to swing reciprocally around the second rotating shaft.

6. The minimally invasive medical pendulum saw of claim 5, wherein a distance between the connection end of the saw blade and the second rotational axis is less than a distance between the serrated end of the saw blade and the second rotational axis.

7. The minimally invasive medical pendulum saw of claim 6, wherein the central axis of the first rotating shaft and the central axis of the second rotating shaft are located on the central axis of the drive shaft.

8. The minimally invasive medical pendulum saw of claim 1, wherein the fork is of a sheet-like configuration and the width of the input end of the fork is greater than the width of the output end.

9. The minimally invasive medical pendulum saw according to claim 1, further comprising a housing, wherein the cutter bar is fixedly connected to the front end of the housing, one end of the driving shaft away from the eccentric driving portion penetrates through the cutter bar and stretches into the housing, a second bearing is sleeved on the outer wall of one end of the driving shaft away from the eccentric driving portion, and the outer ring of the second bearing is abutted against the inner wall of the housing.

10. The minimally invasive medical pendulum saw according to claim 1, wherein a third bearing is sleeved at one end of the driving shaft close to the eccentric driving part, and an outer ring of the third bearing is abutted against the inner wall of the cutter bar.