CN113491559B

CN113491559B - Medical reamer

Info

Publication number: CN113491559B
Application number: CN202110845694.9A
Authority: CN
Inventors: 王林忠; 汪代文
Original assignee: 2020 Beijing Medical Technology Co ltd
Current assignee: 2020 Beijing Medical Technology Co ltd
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2022-10-14
Anticipated expiration: 2041-07-26
Also published as: CN113491559A

Abstract

The application relates to a medical reamer, which relates to the field of medical reaming instruments and comprises a main body part, a movable reamer body and a fixed reamer head, wherein the main body part comprises a pipe body, the fixed reamer head comprises a main body part and a reaming part which are integrally arranged, the main body part is of a rod-shaped structure arranged along the length direction of the pipe body, one end of the main body part is fixedly connected with one end of the pipe body, and the reaming part is arranged on the outer side surface of the main body part; the movable cutter body comprises a movable cutter head, the movable cutter head penetrates through the pipe body, and the movable cutter head is arranged on one side, far away from the reaming part, of the main body part. Medical personnel can set up the cell body in the fixed orifices main part on the bone through the enlarger in this application to satisfy the big operation requirement in the little inside hole of bone surface hole.

Description

Medical reamer

Technical Field

The application relates to the field of medical reaming instruments, in particular to a medical reamer.

Background

The fibrous ring is located on the periphery of the intervertebral disc and consists of fibrous cartilages, the fibers of the fibrous ring are distributed among vertebral bodies and are arranged into concentric rings on the transverse section, and the fibrous rings of adjacent rings have opposite slopes and are mutually crossed.

In the process of performing some annulus repair procedures, it is often necessary to provide a fixation hole in the vertebral body for fixing a suture anchor used to fix the wound site on the stop collar. Referring to fig. 1, a fixing hole opened on a vertebral body in the related art is generally composed of only a fixing hole body 5, and the fixing hole body 5 is obtained by directly working on the vertebral body with a medical drill, but since the inner wall of the fixing hole is straight, the suture anchor is not stable when fixed on the vertebral body through the fixing hole. Therefore, during the process of performing the annulus fibrosus repair, a fixing hole with a groove 51 on the inner wall is often opened.

Referring to fig. 2, in the fixing hole having the groove 51 on the inner wall of the fixing hole main body 5, when the medical staff fixes the suture anchor in the groove 51, the groove 51 may form a snap-fit connection with the suture anchor so that the suture anchor is more stable when fixed in the fixing hole, but in the related art, the groove 51 is formed on the inner wall of the fixing hole main body 5, which is generally implemented by using a small-sized cutter 6 having a smaller diameter.

The small-size cutter 6 generally includes that the diameter is less than the holding rod 61 of fixed orifices main part 5, the lateral wall rigid coupling of holding rod 61 has side sword 62, the cutter 6 diameter of side sword 62 position department is less than fixed orifices main part 5, in slotted in-process medical personnel place small-size cutter 6 in fixed orifices main part 5, then scrape in order to form cell body 51 on the inner wall of fixed orifices main part 5 with side sword 62, the fluting mode is very hard and not convenient and swift like this, so how more convenient offer the fixed orifices that the inner wall has cell body 51 on bone 4 a problem that awaits the opportune moment and solve.

Disclosure of Invention

In order to solve the problem that a fixing hole with a groove body on the inner wall is inconvenient to open on a bone in the related art, the application provides a medical reamer.

The purpose of this application is that a medical enlarger that provides adopts following technical scheme:

a medical reamer comprises a main body part, a movable cutter body and a fixed cutter head, wherein the main body part comprises a pipe body, the fixed cutter head comprises a main body part and a reaming part which are integrally arranged, the main body part is of a rod-shaped structure arranged along the length direction of the pipe body, one end of the main body part is fixedly connected with one end of the pipe body, and the reaming part is arranged on the outer side surface of the main body part; the movable cutter body comprises a movable cutter head which is arranged in the pipe body in a penetrating mode, the movable cutter head is arranged in the pipe body in a penetrating mode and arranged on one side, away from the reaming part, of the main body part, and when the movable cutter head receives force along the axis direction of the pipe body, the movable cutter head can move along the axis direction of the pipe body.

Through adopting above-mentioned technical scheme, at the in-process that carries out reaming, medical personnel can make the stationary knife head insert the fixed orifices main part in, then will move the movable knife head along the gap extrusion to the fixed orifices main part between stationary knife head and the fixed orifices main part inner wall in, the reaming portion on this in-process stationary knife head can be embedded into the bone in, then medical personnel rotate the stationary knife head through the body for open the cell body on the fixed orifices main part inner wall, easy operation and convenience.

Optionally, a guide surface for pressing the movable tool bit into the fixed hole main body is arranged at the end part of the movable tool bit at the position of the fixed tool bit, and the guide surface inclines downwards away from the direction of the fixed tool bit.

Through adopting above-mentioned technical scheme, the medical personnel of being convenient for extrude the tip of activity sword between the inner wall of fixed cutter head and fixed orifices main part to make medical personnel more convenient at the in-process that makes activity sword extrude to the fixed orifices main part.

Optionally, the outer peripheral surface of the movable tool bit is respectively attached to and slidably connected with the inner wall of the tube body and the outer surface of the main body part, the cross section of the tube body is circular, and the attached parts of the movable tool bit and the main body part jointly form a cylindrical structure matched with the tube body.

Through adopting above-mentioned technical scheme, because the cross-section of body is circular, people can be more comfortable when holding the body at ordinary times, and can make the adaptation that enlarger and fixed orifices main part are fine, body and main part can form the restriction to the activity tool bit jointly simultaneously, make the activity tool bit can only move along the length direction of body, activity tool bit self can not produce the displacement of rotation and other direction, like this when the body drives the in-process activity tape head that the fixed tool bit carries out the rotation and can carry out synchronous rotation along with the body, the fixed tool bit can not produce the interference to the rotation of fixed tool bit because the rotation or the position of other directions, simultaneously at the in-process of extrudeing the activity tool bit to the fixed orifices main part, the spigot surface also aligns with the gap between fixed orifices main part and the main part more easily.

Optionally, a positioning hole is formed in the outer peripheral surface of the pipe body at the end where the fixed cutter head is located, one end of the main body portion penetrates through the pipe body, a positioning pin is integrally arranged on the fixed cutter head, the positioning pin penetrates through the positioning hole, and the positioning pin is welded with the pipe body.

By adopting the technical scheme, the connecting area between the fixed cutter head and the pipe body is increased, so that the fixed cutter head is more stable after being fixed on the pipe body, and meanwhile, the fixed cutter head and the pipe body adopt a separated structure, so that the fixed cutter head and the pipe body can be produced in a classified manner in the production link of the reamer, the mutual influence of all parts in the production process is reduced, and then the fixed cutter head and the pipe body are welded and fixed, so that the production of the reamer can be facilitated as much as possible; the fixed cutter head polishes the surface of the pipe body to be smooth after welding with the pipe body is completed, the step shape of the pipe body and the cutter head is guaranteed, and the requirement that the size of an initial hole is not changed during reaming is met.

Optionally, one side of the reaming portion away from the main body portion is provided with two tool faces, and a cutting edge is formed between the two tool faces.

Through adopting above-mentioned technical scheme, be convenient for decide reaming portion of tool bit and insert in the bone.

Optionally, one end of the movable cutter head, which is far away from the fixed cutter head, extends out of the pipe body, and one end of the movable cutter head, which is far away from the fixed cutter head, is fixedly connected with a holding handle.

Through adopting above-mentioned technical scheme, medical personnel can operate movable cutter head through holding handle at the in-process of operation movable cutter head for medical personnel are more convenient at the in-process of operation movable cutter head.

Optionally, a gripping handle is fixedly connected to the tube body.

Through adopting above-mentioned technical scheme, medical personnel can operate fixedly to the body through grabbing the handle, and then make medical personnel be convenient for more to the follow-up operation of body.

Optionally, the grasping handle comprises a connecting part and two holding parts which are integrally arranged, the pipe body penetrates through the connecting part and is fixed with the connecting part, the two holding parts are respectively arranged on two sides of the pipe body, and the holding parts are provided with finger holes.

Through adopting above-mentioned technical scheme, medical personnel can pass two fingers respectively and pass the finger hole on two portions of gripping in order to form to the fixed of gripping handle in the process of gripping the handle, and medical personnel are more stable when gripping the handle like this as far as.

Optionally, a connecting hole matched with the pipe body is formed in the connecting portion, the pipe body penetrates through the connecting hole, and the pipe body and the connecting hole are fixedly welded.

Through adopting above-mentioned technical scheme, adopt the disconnect-type structure between gripping handle and the body, can carry out the classified production to gripping handle and body in enlarger production link, then assemble to reduce the influence each other between each different spare parts of reaming piece production link, and then the holistic production of the enlarger of being convenient for.

Optionally, the outer surface of the main body part is provided with a first identification line, and the first identification line is collinear with the cutting edge of the fixed cutter head.

Through adopting above-mentioned technical scheme, when carrying out reaming work, medical personnel can be through the comparatively convenient position state of controlling reaming portion in the fixed orifices main part of first sign line, and medical personnel can be more convenient at reaming in-process like this.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by designing the hole expander with the pipe body, the fixed cutter head and the movable cutter head, in the hole expanding process, medical workers can enable the fixed cutter head to extend into the fixed hole main body, then extrude the hole expanding part of the fixed cutter head into a bone by the movable cutter head, and then perform hole expanding work, so that the medical workers can more conveniently open corresponding groove bodies on the bone;

2. the fixed cutter head is provided with the guide surface, so that the movable cutter head can be more easily extruded into the fixed hole main body by medical personnel;

3. the pipe body is set to be circular, the main body part of the fixed cutter head and the movable cutter head are set to be semicircular, and the two sides of the movable cutter head are respectively attached to the inner wall of the pipe body and the inner wall of the main body part, so that medical workers can more conveniently align the movable cutter head with the gap between the inner wall of the fixed hole main body and the main body part of the fixed cutter head in the process of pressing the movable cutter head into the fixed hole main body, and the movable cutter head is more stable in the process of moving into the fixed hole; meanwhile, the reamer can be better adapted to the main body of the fixing hole.

Drawings

Fig. 1 is a schematic view of a fixing hole in the related art.

Fig. 2 is a schematic view of a structure of a fixing hole in the related art.

Fig. 3 is a front view of a reamer in an embodiment of the present application.

Fig. 4 is a partially enlarged schematic view of a portion a in fig. 3.

Fig. 5 is a side view of a reamer in an embodiment of the present application.

Fig. 6 is a partially enlarged schematic view of a portion B in fig. 5.

Fig. 7 is a bottom view of a reamer in an embodiment of the present application.

Fig. 8 is a partially enlarged schematic view of a portion C in fig. 7.

Fig. 9 is a schematic diagram of a reaming process of the fixing hole in the embodiment of the present application.

Description of reference numerals: 1. a body member; 11. a pipe body; 111. positioning holes; 12. a gripping handle; 121. a connecting portion; 1211. connecting holes; 122. a holding part; 1221. a finger hole; 13. a first identification line; 2. a movable cutter body; 21. a movable tool bit; 211. a guide surface; 22. a grip handle; 221. a second identification line; 3. a cutter head is fixed; 31. a main body portion; 311. positioning pins; 312. a shrinking surface; 32. a reaming portion; 321. a knife face; 322. a blade; 4. a bone; 5. a fixing hole main body; 51. a trough body; 6. a cutter; 61. a holding rod; 62. and (4) side cutting.

Detailed Description

The present application is described in further detail below with reference to figures 3-9.

The embodiment of the application discloses a medical reamer. Referring to fig. 3 and 4, the reamer includes a body member 1, a movable cutter body 2, and a fixed cutter head 3, the body member 1 includes a tubular body 11, and the fixed cutter head 3 is fixedly installed at one end position of the tubular body 11.

Referring to fig. 5 and 6, the fixed cutter head 3 includes a main body 31 and a hole-enlarging portion 32 integrally formed, the main body 31 has a rod-like structure, one end of the main body 31 penetrates into the pipe 11 along the length direction of the pipe 11, one end of the main body 31 penetrating into the pipe 11 is fixedly connected with the pipe 11, the fixed connection is formed by welding, and the hole-enlarging portion 32 is disposed on the outer peripheral surface of the main body 31 at a position away from one end of the pipe 11.

Referring to fig. 4, two cutter faces 321 are symmetrically provided on the enlarged hole part 32, and a cutting edge 322 is formed between the two cutter faces 321.

Referring to fig. 6, the movable cutter body 2 includes a movable cutter head 21 disposed along the length direction of the tube 11, the movable cutter head 21 is slidably connected in the tube 11, the movable cutter head 21 is disposed on one side of the main body 31 away from the reaming portion 32, and two sides of the movable cutter head 21 are respectively attached to the inner wall of the tube 11 and the outer peripheral surface of the main body 31 and slidably connected.

In the process of drilling the fixed hole, a medical worker can firstly use a medical drill to drill the fixed hole main body 5 on the bone 4, the diameter of the fixed hole main body 5 is matched with one end, away from the tube body 11, of the fixed cutter head 3 or is slightly larger than the diameter of one end, away from the tube body 11, of the fixed cutter head 3, one end, away from the tube body 11, of the fixed cutter head 3 on the tube body 11 is inserted into the fixed hole main body 5, the tube body 11 at one end, where the fixed cutter head 3 is located, abuts against the bone 4, then the medical worker pushes the movable cutter head 21 to move towards the direction of the fixed hole, the movable cutter head 21 is gradually extruded to enter a gap between the fixed cutter head 3 and the inner wall of the fixed hole main body 5, in the process that the movable cutter head 21 enters the fixed hole main body 5, the fixed cutter head 3 is extruded from the movable cutter head 21, so that the reaming part 32 of the fixed cutter head 3 enters the bone 4, and then the medical worker can complete the groove body 51 formed on the inner wall of the fixed hole main body 5 by rotating the fixed cutter head 3 through the tube body 11.

In order to facilitate the medical staff to press the movable tool bit 21 into the fixed hole main body 5, the end of the movable tool bit 21 is provided with an inclined guide surface 211.

Referring to fig. 6, a positioning hole 111 is formed in the outer peripheral surface of one end of the tube body 11 where the fixed cutter head 3 is located, a positioning pin 311 matched with the positioning hole 111 is integrally arranged on the outer peripheral surface of one end of the fixed cutter head 3 extending into the tube body 11, the positioning pin 311 penetrates through the positioning hole 111, and the positioning pin 311 and the tube body 11 are welded and fixed.

Medical personnel can be great increase between fixed tool bit 3 and the body 11 after welding between locating pin 311 and body 11 finishes to make fixed tool bit 3 more stable when fixing on body 11. And polish the body 11 of locating pin 311 and body 11 hookup location department again after the welding finishes and can realize the level and smooth of body 11 surface, simultaneously because be the disconnect-type structure between locating pin 311 and the body 11, like this at the in-process that carries out the reamer production, can carry out the classified production to body 11 and fixed cutter head 3, then weld the equipment to body 11 and fixed cutter head 3 again, the reamer can be more convenient at the in-process of production like this.

Referring to fig. 3, the body member 1 further includes a gripping handle 12 for easy gripping by the medical staff.

Referring to fig. 7 and 8, the grip handle 12 is provided with a connection hole 1211 for inserting the tube 11 therethrough, and the tube 11 is welded to the grip handle 12 after passing through the connection hole 1211 of the grip handle 12.

The gripping handle 12 and the tubular body 11 are of a separated structure, so that the gripping handle 12 and the tubular body 11 can be produced in a classified manner in the reamer production process, and then the gripping handle 12 and the tubular body 11 are welded and assembled, so that the reamer is more convenient and faster in the production process.

Referring to fig. 3, the grip handle 12 further includes a connecting portion 121 and two grip portions 122 integrally formed, the connecting hole 1211 is disposed on the connecting portion 121, the two grip portions 122 are disposed on two sides of the tube 11, the two grip portions 122 are symmetrical on the grip handle 12, and the two grip portions 122 are both provided with finger holes 1221.

During the use process of the reamer, the medical staff can use fingers to penetrate through the finger holes 1221 of the two holding parts 122 to fix the holding handle 22, so that the medical staff can fix the reamer better.

Referring to fig. 3 and 5, one end of the movable tool bit 21 away from the fixed tool bit 3 extends out of the tube 11, and one end of the movable tool bit 21 away from the fixed tool bit 3 is fixedly connected with a holding handle 22, the holding handle 22 is an oval plate-shaped structure, and the movable tool bit 21 is vertically and fixedly connected to a central position of the holding handle 22. The gripping handle 22 is provided for the purpose of facilitating the handling of the movable blade head 21 by the medical staff.

Referring to fig. 7 and 8, the cross section of the tube body 11 is a circular tube, the cross sections of the movable bit 21 and the main body 31 in the fixed bit 3 are both semicircular, the movable bit 21 and the main body 31 are spliced into a cylinder shape matched with the tube body 11, on one hand, the cross section of the tube body 11 is circular, people can feel more comfortable when holding the tube body 11 at ordinary times, and the reamer can be well adapted to the fixed hole main body 5, and meanwhile, the tube body 11 and the main body 31 can limit the movable bit 21 together, so that the movable bit 21 can only move along the length direction of the tube body 11, the movable bit 21 cannot rotate and displace in other directions, so that the movable bit can synchronously rotate along with the tube body 11 in the process that the movable bit 3 rotates along with the tube body 11, the fixed bit 3 cannot interfere with the rotation of the fixed bit 3 due to the rotation or the displacement in other directions, and meanwhile, in the process that the movable bit 21 is extruded to the fixed hole main body 5, the guide surface 211 is easily aligned with the gap between the main body 31 and the fixed hole main body 5.

Referring to fig. 4, in order to reduce resistance of the fixed cutter head 3 entering the fixing hole main body 5 as much as possible, two contracting surfaces 312 are provided at the position of the main body portion 31 at one end of the counterbore portion 32, the two contracting surfaces 312 are respectively located at both sides of the counterbore portion 32, and the contracting surfaces 312 gradually contract inward from the pipe body 11 toward the counterbore portion 32.

Referring to fig. 3, a first identification line 13 arranged along the length direction of the pipe body 11 is arranged on the outer peripheral surface of the pipe body 11 at one end position of the fixed cutter head 3, and the first identification line 13 is aligned with the reaming part 32 of the fixed cutter head 3; medical personnel judge the reaming position of stationary knife head 3 in fixed orifices main part 5 according to the relative position of first sign line 13 that can be comparatively convenient when using the reamer to ream to the medical personnel of being convenient for are to the reaming of 5 inner walls of fixed orifices main part.

The outer peripheral surface of the holding handle 22 is provided with a second identification line 221 arranged along the length direction of the tube body 11, the second identification line 221 is aligned with the first identification line 13, in order to facilitate the observation of the alignment condition between the first identification line 13 and the second identification line 221 by medical personnel, the first identification line 13 is provided with a plurality of first identification lines 13, and the plurality of first identification lines 13 are arranged on the outer surface of the main body part 1 at intervals along the length direction of the tube body 11. In the process of installing the movable tool bit 21 into the tube 11, the movable tool bit 21 can be more conveniently installed into the tube 11 through the relative position of the second identification line 221 and the first identification line 13.

The reamer in the embodiment of the application is not limited to reaming on the vertebral body, and can also be used for reaming on bones 4 at other parts of the body.

Referring to fig. 9, a method of reaming using a reamer includes the steps of:

s1, a medical drill is used for forming a fixing hole main body 5 on a bone 4;

in the process of opening the fixed hole main body 5, medical personnel can select a proper drill bit to open the fixed hole main body 5 with a proper diameter according to actual needs.

S2, enabling a fixed cutter head 3 of the reamer to extend into the fixed hole main body 5;

during the process that the fixed cutter head 3 extends into the fixed hole main body 5, the pipe body 11 in the reamer is ensured to be abutted with the bone 4.

S3, enabling the movable cutter head 21 of the reamer to be extruded into the fixed hole main body 5 along a gap between the fixed cutter head 3 and the inner wall of the fixed hole main body 5, and inserting the reaming part 32 on the fixed cutter head 3 into the bone 4 under the extrusion of the movable cutter head 21;

in the process of squeezing the movable bit 21 into the fixed hole main body 5, firstly, the guide surface 211 on the movable bit 21 is aligned with the gap between the fixed bit 3 and the inner wall of the fixed hole main body 5 in a manner of aligning the holding handle 22 with the marked line on the holding handle 12, and then, the medical staff can squeeze the movable bit 21 into the fixed hole main body 5 along the gap between the fixed bit 3 and the inner wall of the fixed hole main body 5 by pressing the holding handle 22 or using a medical hammer to beat the movable bit 21, and simultaneously, in the process of squeezing the movable bit 21 into the fixed hole main body 5, the expanded part 32 on the fixed bit 3 is inserted into the bone 4 under the squeezing of the movable bit 21.

S4, rotating the tube body 11 and the fixed cutter head 3 to enable the reaming part 32 of the fixed cutter head 3 to open a groove body 51 on the inner wall of the fixed hole main body 5;

during the process of rotating the tube 11, the medical staff needs to reasonably control the position and the number of rotations of the fixed cutter head 3 according to the first marking line 13 and the second marking line 221 on the reamer.

S5, drawing the movable tool bit 21 out of the fixed hole main body 5;

the medical staff pulls the movable tool bit 21 by holding the handle 22 to separate the movable tool bit 21 from the fixed hole main body 5.

S6, moving the fixed cutter head 3 to the center of the fixed hole main body 5 through the pipe body 11, so that the reaming part 32 on the fixed cutter head 3 is separated from the groove body 51, and then drawing the fixed cutter head 3 out of the fixed hole main body 5;

the implementation principle of the method for reaming by using the reamer in the embodiment of the application is as follows: medical personnel use medical drill bit to bore out fixed orifices main part 5 back on bone 4, stretch into fixed orifices main part 5 with the stationary knife head 3 of reamer again in, later the reuse activity bit 21 extrudees the reaming portion 32 of stationary knife head 3 to the bone 4 of the 5 inner walls of fixed orifices main part, rotatory reamer can be at the inside cell body 51 of opening of fixed orifices main part 5 afterwards, this process operation is very simple and convenient relatively.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A medical reamer is characterized in that: the cutter comprises a main body part (1), a movable cutter body (2) and a fixed cutter head (3), wherein the main body part (1) comprises a pipe body (11), the fixed cutter head (3) comprises a main body part (31) and a hole expanding part (32) which are integrally arranged, the main body part (31) is of a rod-shaped structure which is arranged along the length direction of the pipe body (11), one end of the main body part (31) is fixedly connected with one end of the pipe body (11), and the hole expanding part (32) is arranged on the outer side surface of the main body part (31); the movable cutter body (2) comprises a movable cutter head (21) which penetrates through the pipe body (11), the movable cutter head (21) is arranged on one side, away from the reaming part (32), of the main body part (31), and when the movable cutter head (21) receives force along the axial direction of the pipe body (11), the movable cutter head (21) can move along the axial direction of the pipe body (11).

2. The medical reamer of claim 1, wherein: the movable cutter head (21) end part at the position of the fixed cutter head (3) is provided with a guide surface (211) which is convenient for pressing the movable cutter head (21) into the fixed hole main body (5), and the guide surface (211) inclines towards the lower part deviating from the direction of the fixed cutter head (3).

3. The medical reamer of claim 1, wherein: the outer peripheral surface of the movable cutter head (21) is respectively attached to and connected with the inner wall of the pipe body (11) and the outer surface of the main body part (31) in a sliding mode, the cross section of the pipe body (11) is circular, and the attached parts of the movable cutter head (21) and the main body part (31) jointly form a cylindrical structure matched with the pipe body (11).

4. The medical reamer of claim 1, wherein: the fixed cutter head is characterized in that a positioning hole (111) is formed in the outer peripheral face of the pipe body (11) at one end where the fixed cutter head (3) is located, one end of the main body portion (31) penetrates through the pipe body (11), a positioning pin (311) is integrally arranged on the fixed cutter head (3), the positioning pin (311) penetrates through the positioning hole (111), and the positioning pin (311) is welded with the pipe body (11).

5. The medical reamer of claim 1, wherein: two cutter faces (321) are arranged on one side of the reaming part (32) far away from the main body part (31), and a cutting edge (322) is formed between the two cutter faces (321).

6. The medical reamer of claim 1, wherein: one end, far away from the fixed cutter head (3), of the movable cutter head (21) extends out of the pipe body (11), and a holding handle (22) is fixedly connected to one end, far away from the fixed cutter head (3), of the movable cutter head (21).

7. The medical reamer of claim 1, wherein: the pipe body (11) is fixedly connected with a gripping handle (12).

8. The medical reamer of claim 7, wherein: the gripping handle (12) comprises a connecting part (121) and two gripping parts (122) which are integrally arranged, the pipe body (11) penetrates through the connecting part (121), the pipe body (11) is fixed with the connecting part (121), the two gripping parts (122) are respectively arranged on two sides of the pipe body (11), and finger holes (1221) are formed in the gripping parts (122).

9. The medical reamer of claim 8, wherein: the connecting part (121) is provided with a connecting hole (1211) matched with the pipe body (11), the pipe body (11) penetrates through the connecting hole (1211), and the pipe body (11) and the connecting hole (1211) are fixed in a welding mode.

10. The medical reamer of claim 1, wherein: the outer surface of the main body piece (1) is provided with a first identification line (13), and the first identification line (13) is collinear with the cutting edge (322) of the fixed cutter head (3).