Medical oscillating saw

Abstract

This invention discloses a medical oscillating saw, comprising a blade holder assembly and a tail sleeve assembly connected to each other. The blade holder assembly includes a shift fork and a blade holder fixedly connected to the shift fork, with a blade fixed on the blade holder. The tail sleeve assembly includes an eccentric shaft and a first bearing. The eccentric shaft includes a horizontally arranged first column and an inclined second column, with the central axis of the first column intersecting the central axis of the second column. The inner ring of the first bearing is sleeved on the second column, and the outer ring of the first bearing abuts against the shift fork, with the first bearing in line contact with the shift fork. This invention enables the shift fork to maintain line contact with the first bearing, increasing the force-bearing area of ​​the shift fork and reducing the force required for the first bearing to drive the shift fork to oscillate.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a medical oscillating saw. Background Technology

[0002] With the advancement and development of medicine, the requirements for medical equipment are becoming increasingly stringent. In orthopedic surgery, oscillating saws with high-speed oscillating blades are generally used to remove bone tissue.

[0003] Current medical oscillating saws generally use a fork connected to a transmission device to drive the blade rotation. Existing transmission devices use bearings and connecting balls on the input shaft to drive the fork and thus the saw blade oscillates. Because the bearings and connecting balls remain horizontal or vertical throughout the movement, while the fork oscillates continuously and is mostly tilted, the contact between the bearings / balls and the fork is generally point contact. Therefore, the force exerted by the transmission device to drive the fork's oscillation can only act on a single point, requiring a relatively large force to drive the fork's oscillation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a medical oscillating saw that maintains line contact between the fork and the first bearing, increases the force-bearing area of ​​the fork, and reduces the force required for the first bearing to drive the fork to oscillate.

[0005] This invention is achieved through the following technical solution:

[0006] A medical oscillating saw includes a blade holder assembly and a tail sleeve assembly connected to each other. The blade holder assembly includes a shift fork and a blade holder fixedly connected to the shift fork, with a blade fixed on the blade holder. The tail sleeve assembly includes an eccentric shaft and a first bearing. The eccentric shaft includes a horizontally arranged first column and an inclined second column, with the central axis of the first column intersecting the central axis of the second column. The inner ring of the first bearing is sleeved on the second column, and the outer ring of the first bearing abuts against the shift fork, with the first bearing in line contact with the shift fork.

[0007] Furthermore, the second column is integrally formed with the first column.

[0008] Furthermore, the second column is inclined toward the central axis of the first column.

[0009] Furthermore, the central axis of the second column coincides with the central axis of the shift fork.

[0010] Furthermore, the second column is provided with a stepped surface, and an open retaining ring is connected to the end of the second column away from the first column, and the first bearing is disposed between the stepped surface and the open retaining ring.

[0011] Furthermore, a spacer ring is provided at the end of the second column away from the first column, and one end of the first bearing abuts against the stepped surface, while the other end abuts against the spacer ring.

[0012] Furthermore, the shift fork includes a main body, on both sides of which a pair of connecting arms are symmetrically arranged, the connecting arms extending from one end of the main body along the central axis of the shift fork.

[0013] Furthermore, the first bearing abuts against the connecting arm, and the first bearing makes line contact with the connecting arm.

[0014] Furthermore, the shift fork is provided with a mounting groove and a first fixing hole; the axial direction of the mounting groove is perpendicular to the axial direction of the first fixing hole; the tool holder is provided with a connecting seat, and the connecting seat is provided with a second fixing hole; the connecting seat is installed in the mounting groove, and the second fixing hole communicates with the first fixing hole.

[0015] Furthermore, the tool holder assembly also includes a cylindrical pin and a screw. The cylindrical pin passes through the first fixing hole and the second fixing hole in sequence. The screw is located on the side of the cylindrical pin away from the mounting groove and abuts against the cylindrical pin. The screw is threadedly connected to the shift fork.

[0016] Compared with the prior art, the advantages of this invention are:

[0017] 1. The tilted second column and the first bearing sleeved on the second column drive the shift fork to swing, so that the central axis of the second column can change with the swing of the shift fork during the movement, thereby making the central axis of the second column coincide with the central axis of the shift fork. The first bearing and the shift fork maintain line contact, increasing the force-bearing area of ​​the shift fork and reducing the force required for the first bearing to drive the shift fork to swing.

[0018] 2. The tool holder and the shift fork are fixedly connected by the connecting seat and the cylindrical pin, and the tool holder is oscillating by the swing of the shift fork.

[0019] 3. By setting the first bearing, the second bearing and the third bearing, the rotational force of the eccentric shaft and the tool holder is removed. Attached Figure Description

[0020] Figure 1 This is a vertical cross-sectional view of a medical oscillating saw according to a preferred embodiment of the present invention;

[0021] Figure 2 for Figure 1 An exploded view of a medical oscillating saw;

[0022] Figure 3 for Figure 1 Exploded view of the center shift fork and the tool holder;

[0023] Figure 4 This is a horizontal cross-sectional view of a medical oscillating saw according to a preferred embodiment of the present invention when the fork is in the middle position;

[0024] Figure 5 This is a horizontal cross-sectional view of a medical oscillating saw in a fork offset state according to a preferred embodiment of the present invention;

[0025] Figure 6 for Figure 1 Front view of the eccentric axis. Detailed Implementation

[0026] The following detailed, non-limiting description of the invention's technical solutions, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this invention, 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," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0027] like Figure 1 and Figure 2 As shown, a medical oscillating saw corresponding to a preferred embodiment of the present invention includes a blade holder assembly 1 and a tail sleeve assembly 2 connected to each other. The tail sleeve assembly 2 is connected to a mobile phone (not shown), and the mobile phone can provide power to the tail sleeve assembly 2. The mobile phone can be a miniature mobile phone, such as the one disclosed in patent number CN115225739A, which has a motor installed inside its casing. The motor is fixedly connected to a connector, and the interface includes a connecting part connected to the motor and another connecting part connected to an accessory such as the medical oscillating saw. The two connecting parts are interconnected, so that the power of the motor can be transmitted to the medical oscillating saw through the connector.

[0028] Further reference Figure 3The tool holder assembly 1 includes a swing housing 14, a shift fork 11 housed within the swing housing 14, a tool holder 12, and a tool 13. The tool 13 is fixedly connected to the tool holder 12. The tool holder 12 is provided with a connecting seat 121. The connecting seat 121 is provided with a second fixing hole 1211 and includes a first connecting portion 1212 and a second connecting portion 1213. The first connecting portion 1212 is connected to a second bearing 142. The second bearing 142 is fixedly connected to the swing housing 14 so that the first connecting portion 1212 can rotate relative to the swing housing 14. The second connecting portion 1213 is connected to the shift fork 11. The second fixing hole 1211 is provided in the second connecting portion 1213. The shift fork 11 includes a main body 112 and a pair of connecting arms 113 symmetrically arranged on both sides of the main body 112. A connecting arm 113 extends from one end of the main body 112 along the central axis 111 of the shift fork 11; specifically, the connecting arm 113 extends from the end of the main body 112 near the tail sleeve assembly 2 along the central axis 111 of the shift fork 11 towards the tail sleeve assembly 2. The shift fork 11 is also provided with a mounting groove 114 and a first fixing hole 115. Preferably, the main body 112 is provided with a mounting groove 114 and a first fixing hole 115; the axial direction of the mounting groove 114 is perpendicular to the axial direction of the first fixing hole 115. The main body 112 is also connected with a cylindrical pin 122 and a screw 123. Specifically, the first fixing hole 115 and the second fixing hole 1211 are interconnected. The cylindrical pin 122 passes through the first fixing hole 115 and the second fixing hole 1211 in sequence to fix the shift fork 11 with the first fixing hole 115 to the tool holder 12 with the second fixing hole 1211. Furthermore, the screw 123 is located on the side of the cylindrical pin 122 away from the mounting groove 114, and the screw 123 abuts against the cylindrical pin 122. Simultaneously, the screw 123 is threadedly connected to the shift fork 11 and is received within the first fixing hole 115. By providing the screw 123 that abuts against the cylindrical pin 122, the position of the cylindrical pin 122 is securely fixed, effectively preventing the cylindrical pin 122 from shifting.

[0029] Further reference Figures 4 to 6The tail sleeve assembly 2 includes an eccentric shaft 21, a tail sleeve 23, a retaining sleeve 24, a locking sleeve 25, and a first bearing 22 connected to the eccentric shaft 21. The eccentric shaft 21 includes a horizontally arranged first column 211 and an inclined second column 212. The first column 211 and the second column 212 are integrally formed. The central axis 2112 of the first column 211 intersects with the central axis 2121 of the second column 212; preferably, the central axis 2112 of the first column 211 also intersects with the central axis of the second bearing 142, and the central axis 2112 of the first column 211 and the central axis of the second bearing 142 are perpendicular to each other. When the first column 211 drives the second column 212 to rotate, the second column 212 can rotate around the central axis 2112 of the first column 211. The second column 212 is inclined toward the central axis 2112 of the first column 211; and the second column 212 is connected to a first bearing 22, an open retaining ring 2123, and a spacer ring 2124; the second column 212 is also provided with a stepped surface 2122 and a groove 2125. The open retaining ring 2123 and the spacer ring 2124 are both located at the end of the second column 212 away from the first column 211. The open retaining ring 2123 is engaged in the groove 2125. The first bearing 22 is located between the open retaining ring 2123 and the stepped surface 2122. Preferably, a spacer ring 2124 is provided between the open retaining ring 2123 and the first bearing 22. One end of the spacer ring 2124 abuts against the open retaining ring 2123, and the other end abuts against the first bearing 22. One end of the first bearing 22 abuts against the spacer ring 2124, and the other end abuts against the stepped surface 2122. By setting a spacer ring 2124 that abuts against the first bearing 22 and a stepped surface 2122, the first bearing 22 is fixed to the second column 212.

[0030] The inner ring of the first bearing 22 is fitted onto the second column 212, and the outer ring of the first bearing 22 abuts against the shift fork 11. Specifically, the outer ring of the first bearing 22 abuts against the connecting arm 113. When the first column 211 drives the second column 212 to rotate, the second column 212 rotates around the central axis 2112 of the first column 211, and drives the first bearing 22, which is fixedly connected to the second column 212, to rotate.

[0031] When the first bearing 22 rotates to the left of the first column 211, the first bearing 22 abuts against the connecting arm 113 on the left side of the shift fork 11 and causes the shift fork 11 to swing to the left. At this time, the central axis 2121 of the second column 212 moves from the left side of the central axis 2112 of the first column 211 to the right side of the central axis 2112 of the first column 211. Furthermore, when the central axis 2121 of the second column 212 is located to the left of the central axis 2112 of the first column 211, the central axis 2121 of the second column 212 is a straight line inclined from the left side of the central axis 2112 of the first column 211 towards the central axis of the second bearing 142; at this time, the central axis 111 of the shift fork 11 is also a straight line inclined from the left side of the central axis 2112 of the first column 211 towards the central axis of the second bearing 142, and the central axis 111 of the shift fork 11 coincides with the central axis 2121 of the second column 212. At this time, the central axis of the first bearing 22 is parallel to the connecting arm 113. Therefore, when the first bearing 22 contacts the connecting arm 113, it is a line contact. When the central axis 2121 of the second column 212 is located to the right of the central axis 2112 of the first column 211, the central axis 2121 of the second column 212 is a straight line inclined from the right side of the central axis 2112 of the first column 211 towards the central axis of the second bearing 142. At this time, the central axis 111 of the shift fork 11 is also a straight line inclined from the right side of the central axis 2112 of the first column 211 towards the central axis of the second bearing 142, and the central axis 111 of the shift fork 11 coincides with the central axis 2121 of the second column 212. At this time, the central axis of the first bearing 22 is parallel to the connecting arm 113. Therefore, when the first bearing 22 contacts the connecting arm 113, it is a line contact.

[0032] When the first bearing 22 rotates to the right of the first column 211, the first bearing 22 abuts against the connecting arm 113 on the right side of the shift fork 11 and causes the shift fork 11 to swing to the right. At this time, the central axis 2121 of the second column 212 moves from the right side of the central axis 2112 of the first column 211 to the left side of the central axis 2112 of the first column 211. Furthermore, when the central axis 2121 of the second column 212 is located to the right of the central axis 2112 of the first column 211, the central axis 2121 of the second column 212 is a straight line inclined from the right side of the central axis 2112 of the first column 211 towards the central axis of the second bearing 142; at this time, the central axis 111 of the shift fork 11 is also a straight line inclined from the right side of the central axis 2112 of the first column 211 towards the central axis of the second bearing 142, and the central axis 111 of the shift fork 11 coincides with the central axis 2121 of the second column 212. At this time, the central axis of the first bearing 22 is parallel to the connecting arm 113. Therefore, when the first bearing 22 contacts the connecting arm 113, it is a line contact. When the central axis 2121 of the second column 212 is located to the left of the central axis 2112 of the first column 211, the central axis 2121 of the second column 212 is a straight line inclined from the left side of the central axis 2112 of the first column 211 towards the central axis of the second bearing 142. At this time, the central axis 111 of the shift fork 11 is also a straight line inclined from the left side of the central axis 2112 of the first column 211 towards the central axis of the second bearing 142, and the central axis 111 of the shift fork 11 coincides with the central axis 2121 of the second column 212. At this time, the central axis of the first bearing 22 is parallel to the connecting arm 113. Therefore, when the first bearing 22 contacts the connecting arm 113, it is a line contact. Therefore, when the second column 212 rotates and drives the shift fork 11 to move through the first bearing 22, the central axis 2121 of the second column 212 and the central axis 111 of the shift fork 11 always coincide; and the central axis of the first bearing 22 is parallel to the connecting arm 113, and the first bearing 22 is always in line contact with the shift fork 11 when it drives the shift fork 11 to move.

[0033] The first column 211 is disposed within the tail sleeve 23 and connected to the third bearing 233. Two third bearings 233 are provided. Specifically, the first column 211 is provided with a first convex ring 2111. Two third bearings 233 are sleeved on the first column 211 and located on both sides of the first convex ring 2111, and the two third bearings 233 also abut against the inner wall of the tail sleeve 23. The first convex ring 2111 is fitted with a tail sleeve spacer ring 2331 that abuts against the inner wall of the tail sleeve 23. A retaining sleeve 24 that engages with the tail sleeve 23 is connected to one end of the tail sleeve 23 near the second column 212, and a gasket 2332 that abuts against the stepped portion 232 of the tail sleeve 23 is also provided inside the tail sleeve 23. Two third bearings 233 are disposed between the sleeve 24 and the gasket 2332, with one third bearing 233 having its two ends abutting against the sleeve 24 and the tail sleeve spacer 2331 respectively, and the other third bearing 233 having its two ends abutting against the tail sleeve spacer 2331 and the gasket 2332 respectively; thus fixing the third bearings 233 to the tail sleeve 23. At the same time, the first column 211 is fixed to the tail sleeve 23 through the third bearings 233 and the tail sleeve spacer 2331.

[0034] The tail sleeve 23 also has a second protruding ring 231 integrally formed. The second protruding ring 231 abuts against the swing housing 14. The locking sleeve 25 is fixedly connected to the swing housing 14, and at the same time, the locking sleeve 25 abuts against the tail sleeve 23. Preferably, an adjusting washer 251 is provided between the locking sleeve 25 and the swing housing 14; one end of the adjusting washer 251 abuts against the swing housing 14, and the other end abuts against the locking sleeve 25. By abutting the tail sleeve 23 against the swing housing 14 and the locking sleeve 25 connected to the swing housing 14 respectively, the tail sleeve 23 is limited to prevent it from moving relative to the swing housing 14. Furthermore, in order to improve the sealing performance when the tail sleeve 23 is connected to the swing housing 14, a first sealing ring 241 is provided between the retaining sleeve 24 and the tail sleeve 23; a second sealing ring 242 is provided between the retaining sleeve 24 and the swing housing 14.

[0035] In use, the medical oscillating saw is connected to a mobile phone; the mobile phone drives the eccentric shaft 21 to rotate at high speed. The second column 212 of the eccentric shaft 21 rotates at high speed around the central axis 2112 of the first column 211; at this time, the first bearing 22 sleeved on the second column 212 rotates at high speed around the central axis 2112 of the first column 211 and drives the shift fork 11 to swing left and right. At the same time, the first bearing 22 and the shift fork 11 maintain line contact. The shift fork 11 drives the tool holder 12 connected to the tool 13 to swing left and right, thereby realizing the left and right swing of the tool 13. The tilted second column 212 and the first bearing 22 sleeved on the second column 212 drive the shift fork 11 to swing, so that the central axis 2121 of the second column 212 can change with the swing of the shift fork 11 during the movement, thereby keeping the central axis 2121 of the second column 212 coincident with the central axis 111 of the shift fork 11. The first bearing 22 maintains line contact with the shift fork 11, thereby increasing the force-bearing area of ​​the shift fork 11, reducing the force required for the first bearing 22 to drive the shift fork 11 to swing, and reducing the torque required for the eccentric shaft 21 to rotate. The first bearing 22 is fixed to the second column 212 through the cooperation of the stepped surface 2122, the open retaining ring 2123, and the spacer ring 2124. The tool holder 12 is fixedly connected to the shift fork 11 through the cooperation of the connecting seat 121 and the cylindrical pin 122, and the tool holder 12 is driven to swing by the swing of the shift fork 11. By setting the first bearing 22, the second bearing 142 and the third bearing 233, the rotational force of the eccentric shaft 21 and the tool holder 12 is removed.

[0036] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A medical oscillating saw, comprising a blade holder assembly (1) and a tail sleeve assembly (2) connected to each other, characterized in that, The tool holder assembly (1) includes a shift fork (11) and a tool holder (12) fixedly connected to the shift fork (11), and a tool (13) is fixed on the tool holder (12); the tail sleeve assembly (2) includes an eccentric shaft (21) and a first bearing (22); the eccentric shaft (21) includes a horizontally arranged first column (211) and an inclined second column (212), the central axis (2112) of the first column (211) intersects the central axis (2121) of the second column (212); the inner ring of the first bearing (22) is sleeved on the second column (212), the outer ring of the first bearing (22) abuts against the shift fork (11), and the first bearing (22) is in line contact with the shift fork (11); The second column (212) is integrally formed with the first column (211); the second column (212) is inclined toward the central axis (2112) of the first column (211); the central axis (2121) of the second column (212) coincides with the central axis (111) of the fork (11); the second column (212) is provided with a stepped surface (2122).

2. The medical oscillating saw according to claim 1, characterized in that, The second column (212) is connected to an open retaining ring (2123) at the end away from the first column (211), and the first bearing (22) is disposed between the stepped surface (2122) and the open retaining ring (2123).

3. The medical oscillating saw according to claim 2, characterized in that, The second column (212) is provided with a spacer ring (2124) at the end away from the first column (211), and one end of the first bearing (22) abuts against the stepped surface (2122) and the other end abuts against the spacer ring (2124).

4. The medical oscillating saw according to any one of claims 1 to 3, characterized in that, The shift fork (11) includes a main body (112), and a pair of connecting arms (113) are symmetrically arranged on both sides of the main body (112). The connecting arms (113) extend from one end of the main body (112) along the central axis (111) of the shift fork (11).

5. The medical oscillating saw according to claim 4, characterized in that, The first bearing (22) abuts against the connecting arm (113), and the first bearing (22) and the connecting arm (113) are in line contact.

6. The medical oscillating saw according to any one of claims 1 to 3, characterized in that, The shift fork (11) is provided with a mounting groove (114) and a first fixing hole (115); the axial direction of the mounting groove (114) is perpendicular to the axial direction of the first fixing hole (115); the tool holder (12) is provided with a connecting seat (121), and the connecting seat (121) is provided with a second fixing hole (1211); the connecting seat (121) is installed in the mounting groove (114), and the second fixing hole (1211) communicates with the first fixing hole (115).

7. The medical oscillating saw according to claim 6, characterized in that, The tool holder assembly (1) further includes a cylindrical pin (122) and a screw (123). The cylindrical pin (122) is sequentially inserted into the first fixing hole (115) and the second fixing hole (1211). The screw (123) is located on the side of the cylindrical pin (122) away from the mounting groove (114) and abuts against the cylindrical pin (122). The screw (123) is threadedly connected to the shift fork (11).

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