CN215306459U - Medical abrasive drilling cutter - Google Patents
Medical abrasive drilling cutter Download PDFInfo
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- CN215306459U CN215306459U CN202121746670.XU CN202121746670U CN215306459U CN 215306459 U CN215306459 U CN 215306459U CN 202121746670 U CN202121746670 U CN 202121746670U CN 215306459 U CN215306459 U CN 215306459U
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Abstract
The utility model discloses a medical abrasive drilling cutter, which comprises an outer cutter assembly and an inner cutter assembly which is rotatably arranged in the outer cutter assembly, wherein the outer cutter assembly comprises an outer pipe assembly and an outer pipe supporting piece, the inner cutter assembly comprises an inner pipe assembly, the inner cutter assembly also comprises an inner pipe supporting assembly, the inner pipe supporting assembly is sleeved on the inner pipe assembly and synchronously rotates along with the inner pipe assembly, and an axial positioning structure for preventing the inner pipe assembly from moving along the axial direction is arranged between the inner pipe supporting assembly and the outer pipe supporting piece. The medical abrasive drilling cutter can prevent the inner pipe assembly from moving relatively along the axial direction, and improves the stability of the cutter in the operation process.
Description
Technical Field
The utility model relates to medical instruments, in particular to a medical abrasive drilling cutter.
Background
The existing medical abrasive drilling tool comprises an inner tool assembly and an outer tool assembly, wherein the outer tool assembly is fixed, the inner tool assembly rotates, and a grinding head rotates along with the inner tool assembly; interior knife tackle rotating part and outer knife tackle spare contact friction lead to phenomenons such as generating heat, metal bonding, and in the current medical abrasive drilling cutter, use high temperature resistant material to make friction washer and install on knife tackle spare including, reach the effect of keeping apart interior knife tackle spare and outer knife tackle spare, nevertheless can't reach axial limiting displacement, the knife tackle spare can produce axial float phenomenon in the operation process.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a medical abrasive drilling tool to avoid axial movement of an inner cutter assembly.
In order to solve the above problems and the problems related to the above problems, the present invention provides the following technical solutions:
the utility model provides a medical abrasive drilling cutter, is in including outer sword subassembly and rotatable setting interior sword subassembly in the outer sword subassembly, outer sword subassembly includes outer tube assembly and outer tube support piece, interior sword subassembly includes the inner tube subassembly, interior sword subassembly still includes inner tube supporting component, inner tube supporting component overlaps on the inner tube subassembly to rotate along with the inner tube subassembly is synchronous, wherein, inner tube supporting component with be provided with the axial positioning structure who is used for preventing inner tube subassembly along the axial cluster to move between the outer tube support piece.
Optionally, a bearing for forming the axial positioning structure is disposed between the inner tube supporting assembly and the outer tube supporting assembly, a supporting position between the inner tube supporting assembly and the outer tube assembly is located behind a supporting position between the outer tube supporting assembly and the outer tube assembly, an axial position between the bearing and the outer tube supporting assembly is relatively fixed, and an axial position between the bearing and the inner tube supporting assembly is relatively fixed.
Optionally, a journal used for being matched with an inner hole of the bearing is arranged on the outer tube supporting piece, and a bearing hole used for being matched with and installed in the bearing is arranged on the inner tube supporting assembly;
the bearing is in interference fit with the bearing hole, a shaft shoulder for axially positioning one end of the bearing is arranged on the outer tube supporting piece, and an axial positioning piece for positioning the other end of the bearing is arranged on the shaft neck.
Optionally, a journal for matching with an inner hole of the bearing is arranged on the inner tube support assembly, and a bearing hole for fitting the bearing is arranged on the outer tube support;
the bearing is in interference fit with the bearing hole, the inner tube supporting assembly is provided with a shaft shoulder for axially positioning one end of the bearing, and the shaft neck is detachably provided with an axial positioning piece for positioning the other end of the bearing.
Optionally, the inner tube supporting assembly comprises an inner knife supporting sleeve and a transition sleeve arranged at the front end of the inner knife supporting sleeve, the inner knife supporting sleeve is integrally sleeved outside the inner tube assembly and rotates along with the inner tube assembly, the shaft neck and the shaft shoulder are both formed on the transition sleeve,
the transition sleeve and the inner cutter supporting sleeve are arranged in a split mode, a torque transmission structure is arranged between the transition sleeve and the inner cutter supporting sleeve, or the transition sleeve and the inner cutter supporting sleeve are integrally formed.
Optionally, the torque transmission structure comprises a torque transmission protrusion arranged at the rear end of the transition sleeve and a torque transmission groove arranged at the front end of the inner cutter support sleeve, and the torque transmission protrusion is embedded in the torque transmission groove in a matching manner;
or
The torque transmission structure comprises a torque transmission groove arranged at the rear end of the transition sleeve and a torque transmission bulge arranged at the front end of the inner cutter support sleeve, and the torque transmission bulge is embedded into the torque transmission groove in a matched mode.
Optionally, the inner tube supporting assembly comprises an inner knife supporting sleeve and an elastic expansion sleeve, an expansion space is formed between the inner knife supporting sleeve and the inner tube assembly, and the elastic expansion sleeve is detachably expanded in the expansion space.
Optionally, an expansion hole coaxial with the inner cutter assembly is formed in the inner wall of the inner cutter supporting sleeve, the expansion hole penetrates through the rear end of the inner cutter supporting sleeve, and a step surface for abutting against one end of the elastic expansion sleeve is formed at the front end of the expansion hole.
Optionally, the expansion hole has a taper, the diameter of the expansion hole is sequentially increased from front to back, and the elastic expansion sleeve is cylindrical in outer contour in a free state;
the expansion hole has taper, the diameter of the expansion hole is sequentially increased from front to back, the outer contour of the elastic expansion sleeve in a free state also has taper, and the outer diameter of the elastic expansion sleeve is sequentially increased from front to back;
the expansion hole is a cylindrical hole, the outer contour of the elastic expansion sleeve in a free state has taper, and the outer diameter of the elastic expansion sleeve is sequentially increased from front to back.
Optionally, the medical abrasive drilling tool further comprises a sealing sleeve, a sealing surface is arranged at the tail of the inner tool supporting sleeve, the expansion hole is formed in the sealing surface, the sealing sleeve is sleeved on the inner tube assembly, the front end face of the sealing sleeve is attached to the sealing surface, and the sealing sleeve seals the expansion space.
Optionally, the bearing is a sliding bearing or a rolling bearing.
Optionally, the axial positioning element is a lock nut or a retainer ring.
According to the medical abrasive drilling cutter, the inner tube supporting assembly for positioning the inner tube assembly is additionally arranged, and the axial positioning structure is arranged between the inner tube supporting assembly and the outer tube supporting piece, so that the inner tube assembly can be prevented from moving relatively along the axial direction, the stability of the cutter in the operation process is improved, and the phenomenon of friction heating of the inner cutter assembly and the outer cutter assembly due to high-speed rotation of the inner cutter assembly is effectively avoided.
Drawings
FIG. 1 is a schematic view of an exemplary construction of a medical burr cutting tool of the present invention;
FIG. 2 is an enlarged view taken at I in FIG. 1;
FIG. 3 is an exploded view of the inner blade assembly of FIG. 2;
FIG. 4 is a schematic structural view of the tube support of FIG. 2;
FIG. 5 is a schematic structural view of the inner tube support assembly of FIG. 2;
FIG. 6 is a schematic structural view of the transition sleeve of FIG. 3;
FIG. 7 is a top view of FIG. 6;
fig. 8 is a schematic three-dimensional structure of the inner blade support sleeve shown in fig. 3.
FIG. 9 is a schematic view of another exemplary construction of a medical burr cutter of the present invention;
part number description:
a grinding head 100;
the inner knife assembly 300, the inner tube assembly 310, the inner tube support assembly 320, a shaft neck 320a, a shaft shoulder 320b, an inner knife support sleeve 321, a torque transmission groove 321a, a sealing surface 321b, an expansion hole 321c, a step surface 321d, a transition sleeve 322, a torque transmission protrusion 322a, an elastic expansion sleeve 323 and a sealing sleeve 324;
bearing 400, axial positioning piece 500.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
In the embodiments described below, the orientation qualifiers "front" and "rear" are relative terms, with "front" referring to the direction away from the handle and "rear" referring to the direction closer to the handle.
Referring to fig. 1 to 9 in combination, the medical drill sharpening cutter of the present invention includes an outer cutter assembly 200 and an inner cutter assembly 300 rotatably disposed in the outer cutter assembly 200, the outer cutter assembly 200 includes an outer tube assembly 210 and an outer tube support 220, the inner cutter assembly 300 includes an inner tube assembly 310 and an inner tube support assembly 320, the inner tube support assembly 320 is sleeved on the inner tube assembly 310 and rotates synchronously with the inner tube assembly 310, and an axial positioning structure for preventing the inner tube assembly 310 from moving axially is disposed between the inner tube support assembly 320 and the outer tube support 220.
According to the medical drill grinding cutter, the inner tube supporting assembly 320 for positioning the inner tube assembly 310 is additionally arranged, and the axial positioning structure is arranged between the inner tube supporting assembly 320 and the outer tube supporting member 220, so that the inner tube assembly 310 can be prevented from moving relatively along the axial direction, and the stability of the grinding head 100 of the cutter in the operation process is improved.
In the practical implementation process, the inner pipe assembly can only have a single pipe fitting, or can be a combination of the inner pipe and other parts, and the outer pipe assembly can only have a single pipe fitting, or can be a combination of the pipe fitting and other parts. Similarly, the inner tube support assembly and the outer tube support may have only a single part or a combination of multiple parts.
In some embodiments, referring to fig. 2 and 9, a bearing 400 for forming an axial positioning structure is disposed between the inner tube support assembly 320 and the outer tube support 220, a support position between the inner tube support assembly 320 and the inner tube assembly 310 is behind a support position between the outer tube support 220 and the outer tube assembly 210, an axial position between the bearing 400 and the outer tube support 220 is relatively fixed, and an axial position between the bearing 400 and the inner tube support assembly 320 is relatively fixed.
In this way, by additionally installing the bearing 400, the axial positions of the bearing 400, the outer tube supporting piece 220 and the inner tube supporting assembly 320 are fixed respectively to realize axial positioning, so that not only can the relative transmission of the inner tube assembly 310 along the axial direction be avoided, but also the inner tube assembly 310 can rotate smoothly, and the phenomenon of heat generation due to friction between the inner knife assembly and the outer knife assembly caused by high-speed rotation of the inner knife assembly is effectively avoided.
In practical implementation, the bearing 400 may be a sliding bearing or a rolling bearing, and of course, in the rolling bearing mode, the relative rotation between the inner cutter assembly 300 and the outer cutter assembly 200 is generally less resistant and smoother. The drawings of the following embodiments each exemplify a rolling bearing.
In some embodiments, referring to fig. 2 to 5, a journal 320a for engaging with an inner hole of the bearing 400 is disposed on the inner tube support assembly 320, a bearing hole 221 for receiving the bearing 400 is disposed on the outer tube support 220, the bearing 400 and the bearing hole 221 are in interference fit, a shoulder 320b for axially positioning one end of the bearing 400 is disposed on the inner tube support assembly 320, and an axial positioning element 500 for positioning the other end of the bearing 400 is detachably disposed on the journal 320 a. In fig. 2, the axial positioning element 500 is a retainer ring, in an actual implementation process, the axial positioning element 500 may also be a lock nut, and in addition, in an actual implementation process, if the bearing 400 is a rolling bearing, the shoulder 320b is used for positioning an inner ring of the bearing 400, and is only in contact with the inner ring of the bearing 400, but not in contact with an outer ring of the bearing 400, for example, in fig. 2, an avoiding structure is formed at a periphery of a shaft section corresponding to the shoulder, so that the outer ring of the bearing 400 is not in contact with the inner tube supporting assembly 320, and it can be ensured that the inner ring of the bearing can smoothly rotate relative to the outer ring.
In other embodiments, referring to fig. 9, a journal for fitting with an inner hole of the bearing may be disposed on the outer tube support, a bearing hole for fitting the bearing is disposed on the inner tube support assembly, the bearing and the bearing hole are still in interference fit, a shoulder for axially positioning one end of the bearing is disposed on the outer tube support, and an axial positioning element for positioning the other end of the bearing is disposed on the journal 320 a.
The bearing 400 can be installed regardless of whether the bearing hole is formed in the inner tube supporting member 320 or the outer tube supporting member 220, but the outer diameter of the inner tube supporting member 320 can be more easily controlled within a relatively small size range by disposing the bearing hole 221 in the outer tube supporting member 220 in fig. 2 than by disposing the bearing hole 221 in the inner tube supporting member 320 in the figure.
In some embodiments, referring to fig. 2 to 8 in combination, the inner tube support assembly 320 includes an inner knife support sleeve 321 and a transition sleeve 322 disposed at a front end of the inner knife support sleeve 321, the inner knife support sleeve 321 is integrally sleeved outside the inner tube assembly 310 and rotates with the inner tube assembly 310, a shaft neck 320a and a shaft shoulder 320b are both formed on the transition sleeve 322, in the figures, the transition sleeve 322 and the inner knife support sleeve 321 are separately disposed, and a torque transmission structure is disposed between the transition sleeve 322 and the inner knife support sleeve 321. Of course, in practical implementation, the transition sleeve and the inner cutter supporting sleeve can be integrally formed.
If transition cover and interior sword support cover components of a whole that can function independently set up, during the assembly, can install bearing 400 on transition cover 322 earlier, then in installing bearing 400 cooperation into the corresponding dead eye 221 of outer tube support piece 220, if interference fit between bearing 400 and dead eye 211, when adopting the mode of striking to pack into dead eye 221 with bearing 400, because transition cover 322 length dimension is less, more be convenient for pack into dead eye 221 with bearing 400 smoothly.
In some embodiments, referring to fig. 2 to 8 in combination, the torque transmission structure includes a torque transmission protrusion 322a disposed at a rear end of the transition sleeve 322 and a torque transmission groove 321a disposed at a front end of the inner blade support sleeve 321, the torque transmission protrusion 322a being fitted into the torque transmission groove 321 a; of course, in practical implementation, the torque transmission protrusion 322a may be disposed on the inner blade supporting sleeve 321, and the torque transmission groove 321a may be disposed on the transition sleeve 322. In practical implementation, the torque transmission grooves 321a and the torque transmission protrusions 322a are preferably axially and uniformly distributed, so as to facilitate the dynamic balance of the inner blade assembly 300 during rotation.
In some embodiments, referring to fig. 2-5 in combination, the inner tube support assembly 320 includes an inner blade support sleeve 321 and an elastic expansion sleeve 323, the inner blade support sleeve 321 and the inner tube assembly 310 having an expansion space therebetween, the elastic expansion sleeve 323 being detachably expanded in the expansion space. The mode of the elastic expansion sleeve 323 not only can realize the disassembly and assembly of the inner knife supporting assembly, but also has longer service life and is more reliable compared with the mode of positioning the inner knife supporting assembly by viscose and the like.
In some embodiments, referring to fig. 2 to 5 in combination, an inner wall of the inner cutter supporting sleeve 321 is formed with an expansion hole 321c coaxial with the inner cutter assembly 300, the expansion hole 321c penetrates through a rear end of the inner cutter supporting sleeve 321, and a front end of the expansion hole 321c forms a stepped surface 321d against which one end of the elastic expansion sleeve 323 abuts.
In some embodiments, referring to fig. 2 to 5 in combination, the expansion hole 321c has a taper, the diameter of the expansion hole 321c is gradually increased from front to back, and the outer profile of the elastic expansion sleeve 323 in a free state is cylindrical, so that the elastic expansion sleeve 323 can smoothly enter the expansion space; certainly, in the practical implementation process, a mode that the expansion hole has taper and the outer contour of the elastic expansion sleeve in a free state also has taper can be adopted, the diameter of the expansion hole is sequentially increased from front to back, and the outer diameter of the elastic expansion sleeve is sequentially increased from front to back; the expansion hole can be a cylindrical hole, the outer contour of the elastic expansion sleeve in a free state is tapered, and the outer diameter of the elastic expansion sleeve is sequentially increased from front to back, so that the elastic expansion sleeve can smoothly enter an expansion space.
When the elastic expansion sleeve is installed, the elastic expansion sleeve 323 gradually gets into the expansion space from back to front, and is gradually compressed and deformed, and the compression force becomes larger and larger, so that the inner blade support sleeve 321 is positioned on the inner tube assembly 310, and relative rotation between the two can not occur.
In some embodiments, referring to fig. 2 to 5 in combination, the medical milling and drilling tool further includes a sealing sleeve 324, a sealing surface 321b is disposed at a tail portion of the inner tool supporting sleeve 321, an expansion hole 321c is opened on the sealing surface 321b, the sealing sleeve 324 is sleeved on the inner tube assembly 310, and a front end surface of the sealing sleeve 324 abuts against the sealing surface 321b, so that the sealing sleeve 324 seals the expansion space.
At this time, the sealing sleeve 324 can prevent the liquid in the operation process from moving backwards along the inner tube assembly 310, which is beneficial to ensuring the reliable operation of the power element in the handle for driving the inner knife assembly 300 to rotate.
In practical implementation, the rear end of the elastic expansion sleeve preferably abuts against the end face of the sealing sleeve 324, which is beneficial to avoiding the elastic expansion sleeve from moving along the axial direction after long-term use.
Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a medical abrasive drilling cutter, includes outer sword subassembly and rotatable setting and is in interior sword subassembly in the outer sword subassembly, outer sword subassembly includes outer tube assembly and outer tube support piece, interior sword subassembly includes inner tube assembly, its characterized in that: the inner cutter assembly further comprises an inner tube supporting assembly, the inner tube supporting assembly is sleeved on the inner tube assembly and synchronously rotates along with the inner tube assembly, and an axial positioning structure used for preventing the inner tube assembly from moving in an axial direction is arranged between the inner tube supporting assembly and the outer tube supporting member.
2. The medical abrasive drilling tool according to claim 1, wherein: the bearing is arranged between the inner pipe supporting component and the outer pipe supporting component and used for forming the axial positioning structure, the supporting position between the inner pipe supporting component and the inner pipe component is behind the supporting position between the outer pipe supporting component and the outer pipe component, the axial position between the bearing and the outer pipe supporting component is relatively fixed, and the axial position between the bearing and the inner pipe supporting component is relatively fixed.
3. The medical abrasive drilling tool according to claim 2, wherein: a journal matched with an inner hole of the bearing is arranged on the outer pipe supporting piece, and a bearing hole for matching and installing the bearing is formed in the inner pipe supporting component;
the bearing is in interference fit with the bearing hole, a shaft shoulder for axially positioning one end of the bearing is arranged on the outer tube supporting piece, and an axial positioning piece for positioning the other end of the bearing is arranged on the shaft neck.
4. The medical abrasive drilling tool according to claim 2, wherein: the inner pipe supporting component is provided with a shaft neck matched with an inner hole of the bearing, and the outer pipe supporting component is provided with a bearing hole for the bearing to be matched and installed;
the bearing is in interference fit with the bearing hole, the inner tube supporting assembly is provided with a shaft shoulder for axially positioning one end of the bearing, and the shaft neck is detachably provided with an axial positioning piece for positioning the other end of the bearing.
5. The medical abrasive drilling tool according to claim 4, wherein: the inner tube supporting component comprises an inner knife supporting sleeve and a transition sleeve arranged at the front end of the inner knife supporting sleeve, the inner knife supporting sleeve is integrally sleeved outside the inner tube component and rotates along with the inner tube component, the shaft neck and the shaft shoulder are both formed on the transition sleeve,
the transition sleeve and the inner cutter supporting sleeve are arranged in a split mode, a torque transmission structure is arranged between the transition sleeve and the inner cutter supporting sleeve, or the transition sleeve and the inner cutter supporting sleeve are integrally formed.
6. The medical abrasive drilling tool according to claim 5, wherein:
the torque transmission structure comprises a torque transmission bulge arranged at the rear end of the transition sleeve and a torque transmission groove arranged at the front end of the inner cutter support sleeve, and the torque transmission bulge is embedded into the torque transmission groove in a matching manner;
or
The torque transmission structure comprises a torque transmission groove arranged at the rear end of the transition sleeve and a torque transmission bulge arranged at the front end of the inner cutter support sleeve, and the torque transmission bulge is embedded into the torque transmission groove in a matched mode.
7. The medical abrasive drilling tool according to claim 4, wherein: the inner tube supporting assembly comprises an inner cutter supporting sleeve and an elastic expansion sleeve, an expansion space is formed between the inner cutter supporting sleeve and the inner tube assembly, and the elastic expansion sleeve is detachably expanded in the expansion space.
8. The medical abrasive drilling tool according to claim 7, wherein: the inner wall of the inner cutter supporting sleeve is provided with an expansion hole coaxial with the inner cutter assembly, the expansion hole penetrates through the rear end of the inner cutter supporting sleeve, and the front end of the expansion hole forms a step surface for supporting one end of the elastic expansion sleeve to abut against.
9. The medical abrasive drilling tool according to claim 8, wherein:
the expansion hole has taper, the diameter of the expansion hole is sequentially increased from front to back, and the outer contour of the elastic expansion sleeve in a free state is cylindrical;
or the expansion hole has taper, the diameter of the expansion hole is sequentially increased from front to back, the outer contour of the elastic expansion sleeve in a free state also has taper, and the outer diameter of the elastic expansion sleeve is sequentially increased from front to back;
or the expansion hole is a cylindrical hole, the outer contour of the elastic expansion sleeve in a free state has taper, and the outer diameter of the elastic expansion sleeve is sequentially increased from front to back.
10. The medical abrasive drilling tool according to claim 8, wherein: the inner knife support sleeve is characterized by further comprising a sealing sleeve, a sealing surface is arranged at the tail of the inner knife support sleeve, the expansion hole is formed in the sealing surface, the sealing sleeve is sleeved on the inner tube assembly, the front end face of the sealing sleeve is attached to the sealing surface, and the sealing sleeve blocks the expansion space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121746670.XU CN215306459U (en) | 2021-07-29 | 2021-07-29 | Medical abrasive drilling cutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121746670.XU CN215306459U (en) | 2021-07-29 | 2021-07-29 | Medical abrasive drilling cutter |
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| Publication Number | Publication Date |
|---|---|
| CN215306459U true CN215306459U (en) | 2021-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121746670.XU Active CN215306459U (en) | 2021-07-29 | 2021-07-29 | Medical abrasive drilling cutter |
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| Country | Link |
|---|---|
| CN (1) | CN215306459U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115068050A (en) * | 2022-07-29 | 2022-09-20 | 重庆西山科技股份有限公司 | Medical grinding cutter and dynamic sealing structure thereof |
-
2021
- 2021-07-29 CN CN202121746670.XU patent/CN215306459U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115068050A (en) * | 2022-07-29 | 2022-09-20 | 重庆西山科技股份有限公司 | Medical grinding cutter and dynamic sealing structure thereof |
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