CN215874851U - Medical plane cutter - Google Patents

Abstract

The utility model relates to the technical field of medical instruments, and particularly discloses a medical plane cutter which comprises a cutter handle, a cutter and a power part, wherein the cutter handle comprises a sleeve and a rear fixing sleeve, and the rear fixing sleeve is fixed at one end of the sleeve; the cutter comprises an outer cutter and an inner cutter, wherein the outer cutter comprises an outer cutter holder which is arranged in the sleeve in a penetrating way; a first sealing ring is arranged between the outer cutter holder and the sleeve; the output end of the power part is connected with the inner cutter; one end face of the power part close to the output end is connected with one end of the rear fixing sleeve. This medical planer tool passes through the first sealing washer of establishing between outer blade holder and the sleeve for to the machining precision requirement of the two when outer blade holder and sleeve assembly reduces, has reduced the processing cost, and can prevent that the inside liquid of sleeve from outwards flowing through the junction of the two.

Description

Medical plane cutter

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a medical plane cutter.

Background

The medical planing system is a tool used in minimally invasive endoscopic surgery, and is a surgical power device used for planing biological bone tissues and/or soft tissues in surgery, orthopaedics or otorhinolaryngology and cosmetic surgery. The planing head consists of an inner rotating part and an outer fixing part with a window; the medical planing system is powered by a network power supply, and the host controls the medical planing tool driven by electric power; the suction force is generated by the negative pressure device arranged in the main machine, and the biological tissue after the planing treatment is discharged out of the body through the channel in the cutter. The plane cutter comprises a handle and a cutter; the handle is internally provided with a motor with a speed reducer and is connected with the host machine through a cable and an air pipe.

The outer cutter and the cutter handle of the existing planer tool are connected in a conical surface matching mode, and the connection mode has the advantages that on one hand, the requirement on machining precision is high, the machining difficulty is high, the machining cost is high, and the problem that liquid leaks outwards easily occurs.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: the utility model provides a medical plane cutter to solve outer cutter and handle of a knife junction machining precision requirement height, the degree of difficulty is big, with high costs and take place the outward problem of leaking of liquid easily.

The utility model provides a medical plane cutter, which comprises:

the tool holder comprises a sleeve and a rear fixing sleeve, and the rear fixing sleeve is fixed at one end of the sleeve;

the cutter comprises an outer cutter and an inner cutter, wherein the outer cutter comprises an outer cutter seat, and the outer cutter seat penetrates through the sleeve; a first sealing ring is arranged between the outer cutter holder and the sleeve;

the output end of the power piece is connected with the inner cutter; one end face of the power part close to the output end is connected with one end of the rear fixing sleeve.

Optionally, the tool holder further comprises a front fixing sleeve, the front fixing sleeve is fixed to the other end of the sleeve, a first shaft shoulder is arranged on the periphery of the outer tool holder, and the first shaft shoulder is located between the front fixing sleeve and the sleeve.

Optionally, the first shaft shoulder is provided with a first positioning piece, the sleeve is provided with a second positioning piece, and the first positioning piece can be matched with the second positioning piece in an inserting manner.

Optionally, the rear fixing sleeve is provided with a through hole around the central line direction, one end of the power part is provided with a threaded hole, and a locking bolt can penetrate through the through hole and is in threaded connection with the power part; the periphery of the rear fixing sleeve is provided with threads, the inner side of the sleeve is provided with threads, and the rear fixing sleeve is in threaded connection with the sleeve.

Optionally, the rear fixing sleeve is step-shaped, and the rear fixing sleeve includes a first mounting portion and a second mounting portion; the outer diameter of the first mounting part is larger than that of the second mounting part, and the center line of the through hole is positioned on the circumferential surface of the second mounting part; the second installation part penetrates through the sleeve and is in threaded connection with the inner wall of the sleeve.

Optionally, the fixed cover of back still include with the adjacent third installation department of second installation department, the external diameter of third installation department is less than the external diameter of second installation department, the third installation department with be equipped with seal assembly between the telescopic medial surface.

Optionally, the sleeve is inboard to be kept away from the power part end is equipped with first retaining ring, seal assembly is located including the cover two retaining rings and the second sealing washer of fixed cover in back, the second sealing washer is located two between the retaining ring, two the retaining ring respectively with first retaining ring of separating with the terminal surface butt of second installation department.

Optionally, the outer cutter further comprises an outer cutter tube arranged at one end of the outer cutter holder, and the inner cutter comprises an inner cutter holder and an inner cutter tube arranged at one end of the inner cutter holder; the output end of the power part is provided with a rotating shaft, the rotating shaft is connected with the inner cutter seat, the inner cutter tube is arranged in the outer cutter tube and can rotate in the outer cutter tube.

Optionally, the medical plane cutter further comprises a transmission member, the transmission member is of a cylindrical structure, one end of the transmission member is connected with the inner cutter holder in a clamped mode, and the other end of the transmission member is fixedly connected with the rotating shaft.

Optionally, a second separation retaining ring is arranged in the rear fixing sleeve, a rotary sealing element is arranged between the power element and the second separation retaining ring, and the rotary sealing element is sleeved on the rotating shaft.

The utility model has the beneficial effects that:

the medical plane cutter provided by the utility model has the advantages that the first sealing ring is arranged between the outer cutter holder and the sleeve, the requirement on the processing precision of the outer cutter holder and the sleeve is reduced when the outer cutter holder and the sleeve are assembled, the processing efficiency is improved, the processing cost is reduced, and the liquid in the sleeve can be prevented from flowing out through the joint of the outer cutter holder and the sleeve.

Drawings

FIG. 1 is a schematic structural view of a medical planer according to an embodiment of the present invention;

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

FIG. 3 is an enlarged view of a portion of FIG. 1 at B;

fig. 4 is a schematic view of a second structure of the bump and the notch.

In the figure:

1. a housing; 11. an inner cavity; 12. a liquid joint; 13. a shell cover; 131. an inner cover; 132. an outer cover; 14. a second positioning pin;

2. a knife handle; 21. a front fixing sleeve; 22. a sleeve; 23. a rear fixing sleeve;

221. a bump; 222. a first retainer ring; 223. a liquid outlet; 224. an annular boss;

231. a first mounting portion; 232. a second mounting portion; 233. a third mounting portion; 234. a through hole; 235. a second retainer ring;

3. a cutter;

31. an outer cutter; 311. an outer cutter holder; 312. an outer cutter tube;

3111. a first shoulder; 3112. a notch;

32. an inner cutter; 321. an inner cutter holder; 322. an inner cutter tube;

3211. a first positioning pin;

401. a first seal ring; 402. a second seal ring; 403. a retainer ring; 404. a third seal ring;

5. a motor; 51. a rotating shaft;

6. a transmission member; 7. a spring; 8. pressing the sliding block; 9. and fixing the pin.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Fig. 1 is a schematic structural view of a medical planer tool according to an embodiment of the present invention, fig. 2 is a partially enlarged view of a position a in fig. 1, and fig. 3 is a partially enlarged view of a position B in fig. 1, as shown in fig. 1-3, the present embodiment provides a medical planer tool, which includes a housing 1, a tool shank 2, a tool 3 and a power member, wherein the tool shank 2 includes a front fixing sleeve 21, a sleeve 22 and a rear fixing sleeve 23, and the front fixing sleeve 21 and the rear fixing sleeve 23 are respectively fixed at two ends of the sleeve 22; the shell 1 is sleeved outside the sleeve 22 and the rear fixing sleeve 23; the cutter 3 comprises an outer cutter 31 and an inner cutter 32, wherein the outer cutter 31 comprises an outer cutter holder 311, the outer cutter holder 311 is arranged in the sleeve 22 in a penetrating manner, a first shaft shoulder 3111 is arranged on the periphery of the outer cutter holder 311, and the first shaft shoulder 3111 is positioned between the front fixing sleeve 21 and the sleeve 22; a first sealing ring 401 is arranged between the outer cutter holder 311 and the sleeve 22; the output end of the power part is connected with the inner cutter 32; one end surface of the power part close to the output end is connected with one end of the rear fixed sleeve 23; the power member may be, but is not limited to, an electric motor 5.

According to the medical plane cutter, the first sealing ring 401 is arranged between the outer cutter holder 311 and the sleeve 22, so that on one hand, the assembly position of the outer cutter holder 311 and the sleeve 22 avoids conical surface design, the requirement on the processing precision is reduced, the processing efficiency is further improved, and the manufacturing cost of the outer cutter holder 311 and the sleeve 22 is reduced; on the other hand, the liquid can be prevented from flowing out through the joint of the two. In addition, the arrangement of the first shaft shoulder 3111 facilitates the installation and positioning of the outer cutter holder 311 in the sleeve 22, and improves the installation efficiency.

In order to limit the relative position between the outer tool holder 311 and the sleeve 22 in the circumferential direction, in this embodiment, optionally, the first shaft shoulder 3111 is provided with a first positioning element, and the sleeve 22 is provided with a second positioning element, and the first positioning element can be in plug-in fit with the second positioning element. The circumferential position of the outer knife tube 312 connected with the outer knife holder 311 is relatively fixed through the arrangement, and then the position of the window formed in the outer knife tube 312 is fixed relative to the sleeve 22, so that the use habit of a tool during a doctor operation is favorably maintained, and the comfort of the doctor operation is improved.

Optionally, the first positioning element is a notch 3112 formed on the first shaft shoulder 3111, the second positioning element is a protrusion 221 formed on the sleeve 22, and the protrusion 221 can be engaged with the notch 3112. This arrangement makes the structure of the outer cutter 31 simple and easy to design and manufacture.

Fig. 4 is a schematic view of a second structure of the bump and the notch. With reference to fig. 4, further, the outer diameter of the protrusion 221 is gradually reduced in a direction approaching the outer cutter head, and is conical. This arrangement facilitates the engagement of the protrusion 221 with the notch 3112, which is beneficial to increase the positioning speed of the outer cutter 31 and the sleeve 22. Furthermore, the outer diameter of the notch 3112 is gradually enlarged in a direction away from the outer cutter head, so that the axial rotation of the outer cutter 31 and the sleeve 22 can be effectively prevented by the matching of the notch 3112 and the projection 221 while the positioning speed of the outer cutter 31 and the sleeve 22 is increased. In other embodiments, the protrusion 221 may have other shapes as long as the outer diameter of the protrusion 221 away from the sleeve 22 is smaller than the outer diameter of the notch 3112, and the protrusion 221 may also have a wedge-shaped structure.

In addition, the outer diameter of the first shoulder 3111 is larger than the inner diameter of the sleeve 22. On one hand, the first shaft shoulder 3111 can limit the depth of the outer tool apron 311 extending into the sleeve 22, and a notch 3112 is arranged on the peripheral side of the first shaft shoulder 3111 to limit the position of the outer tool apron 311 relative to the circumferential direction of the sleeve 22; in the second aspect, the notch 3112 is disposed on the first shaft shoulder 3111, which is beneficial to simplifying the design and manufacturing process of the outer tool holder 311, and is also beneficial to simplifying the design and manufacturing process of the sleeve 22.

Optionally, the front retaining sleeve 21 is provided with an annular flange for pressing the first shoulder 3111 against one end of the sleeve 22. The front fixing sleeve 21 is in threaded connection with the sleeve 22, and the inner diameter of the front fixing sleeve 21 is matched with the outer diameter of the sleeve 22. This arrangement improves the efficiency of attaching the outer blade holder 311 to the sleeve 22, and shortens the preparation time for the operation.

Optionally, the outer cutter holder 311 is provided with a first annular groove, in which the first sealing ring 401 is provided. The first sealing ring 401 is preferably an O-ring. The provision of the first annular groove enables the speed of installation of the first seal ring 401 to be increased.

In this embodiment, optionally, the rear fixing sleeve 23 is provided with a through hole 234 around the central line direction, one end of the power member is provided with a threaded hole, and the locking bolt is inserted into the through hole 234 and is screwed with the power member; the periphery of the rear fixing sleeve 23 is provided with threads, the inner side of the sleeve 22 is provided with threads, and the rear fixing sleeve 23 is in threaded connection with the sleeve 22.

In the present embodiment, specifically, the rear fixing sleeve 23 is step-shaped, and the rear fixing sleeve 23 includes a first mounting portion 231 and a second mounting portion 232; the outer diameter of the first mounting portion 231 is larger than that of the second mounting portion 232, and the center line of the through hole 234 is located on the circumferential surface of the second mounting portion 232; the second mounting portion 232 is disposed through the sleeve 22 and screwed with the inner wall of the sleeve 22. This setting make full use of the inner space of sleeve 22, and can not enlarge whole external diameter after being connected with back fixed cover 23, in addition, need not to process the reprocessing screw thread behind the step face to the outside of sleeve 22, improve machining efficiency.

In other embodiments, the position of the through hole 234 may be, but is not limited to, the first mounting portion 231, and the through hole 234 may be adapted to the motors 5 with different outer diameters when the outer diameter of the rear fixing sleeve 23 is not changed, wherein when the outer diameter of the motor 5 is larger, the through hole 234 may be disposed on the first mounting portion 231, and when the outer diameter of the motor 5 is smaller, the through hole 234 may be disposed between the first mounting portion 231 and the second mounting portion 232, and at this time, the thread of the second mounting portion 232 may be interrupted by the through hole 234 without affecting the connection with the sleeve 22, which improves the selectivity of the medical shaver to different motors 5. Alternatively, the number of through holes 234 may be, but is not limited to, three.

Of course, in other embodiments, the rear fixing sleeve 23 and the sleeve 22 may be connected by the fixing pin 9, specifically, the rear fixing sleeve 23 is provided with a first pin hole, the sleeve 22 is provided with a second pin hole, the first pin hole is a blind hole, the second pin hole is a through hole, and the fixing pin 9 is matched with the first pin hole after passing through the second pin hole. Because the shell 1 is sleeved outside the sleeve 22 after the rear fixing sleeve 23 is in pin joint with the sleeve 22, the pin joint does not need to be fixed, the processing time of a pin hole is short, the manufacturing efficiency is improved, and the installation efficiency is improved.

Further, the rear fixing sleeve 23 further includes a third mounting portion 233 adjacent to the second mounting portion 232, an outer diameter of the third mounting portion 233 is smaller than an outer diameter of the second mounting portion 232, and a sealing member is provided between the third mounting portion 233 and the inner side surface of the sleeve 22. This setting has further utilized the inner space of sleeve 22, is favorable to improving sleeve 22's space utilization, and need not to sleeve 22 processing step, has guaranteed sleeve 22's intensity.

Furthermore, a first separation retaining ring 222 is arranged on the end, far away from the power element, of the inner side of the sleeve 22, the sealing assembly comprises two retaining rings 403 and a second sealing ring 402, which are sleeved on the rear fixing sleeve 23, the second sealing ring 402 is located between the two retaining rings 403, and the two retaining rings 403 are respectively abutted against the end faces of the first separation retaining ring 222 and the second mounting portion 232. Alternatively, the retainer ring 403 is a rectangular rubber ring, i.e. the cross section of the retainer ring 403 is rectangular, and the second seal ring 402 may be an O-ring. This setting is sealed through triple seal structure on the one hand, and is sealed effectual, and on the other hand, two retaining rings 403 block second sealing washer 402, can prevent that it from taking place to shift, improve sealed effect.

Optionally, the outer cutter 31 further includes an outer cutter tube 312 disposed at one end of the outer cutter holder 311, and the inner cutter 32 includes an inner cutter holder 321 and an inner cutter tube 322 disposed at one end of the inner cutter holder 321; the output end of the power part is provided with a rotating shaft 51, the rotating shaft 51 is connected with an inner cutter holder 321, and an inner cutter tube 322 is arranged inside the outer cutter tube 312 and can rotate inside the outer cutter tube 312. Further, the medical plane cutter further comprises a transmission member 6, the transmission member 6 is of a cylindrical structure, one end of the transmission member 6 is clamped with the inner cutter holder 321, and the other end of the transmission member 6 is fixedly connected with the rotating shaft 51. A clamping groove is circumferentially formed in one end of the transmission piece 6, a clamping protrusion is axially arranged at one end, away from the inner cutter tube 322, of the inner cutter holder 321, and the clamping groove is clamped with the clamping protrusion. This setting makes the connection of interior blade holder 321 and driving medium 6 comparatively convenient, has improved the installation effectiveness.

Optionally, the rotating shaft 51 is connected with the transmission member 6 through a locking screw, specifically, a threaded hole penetrating through the side wall is formed in the side wall of the transmission member 6, and the locking screw is screwed with the side wall of the threaded hole and can abut against the rotating shaft 51. In other embodiments, the rotating shaft 51 and the transmission member 6 may be connected by bonding or pin joint.

Optionally, one end of the inner tool holder 321, which is away from the inner tool tube 322, is provided with a first positioning pin 3211, the first positioning pin 3211 can penetrate through the transmission member 6, and a spring 7 is disposed between the first positioning pin 3211 and the end surface of the rotating shaft 51. This arrangement facilitates that the inner knife tube 322 is always pressed by the spring 7, so that the inner knife 32 and the outer knife 31 are in a pressing state, preferably, the inner knife head and the outer knife head are pressed tightly. In other embodiments, the first alignment pin 3211 may be replaced by a key.

Further, a pressing slider 8 is arranged between the first positioning pin 3211 and the spring 7. Compress tightly slider 8 and be the cylinder, its diameter size is greater than the external diameter size of spring 7 and first locating pin 3211, and the one end of driving medium 6 is equipped with the flange, the internal diameter of flange equals the external diameter of first locating pin 3211, the diameter size of the internal cavity of driving medium 6 equals the external diameter size who compresses tightly slider 8 and spring 7, this setting makes in the equipment process, spring 7 can not fall out from the flange side of driving medium 6, and the installation effectiveness is improved, has also avoided spring 7 to fall out the back and has caused the destruction to the planer tool.

Further, the pressing slider 8 may be provided in plural, and the pressing force of the spring 7 on the inner cutter 32 can be adjusted by providing different numbers of pressing sliders 8.

Optionally, one end face of the first baffle ring 222 close to the rear fixing sleeve 23 is perpendicular to the central line of the sleeve 22, and the arrangement is favorable for limiting the baffle ring 403; the end face of the first separation retaining ring 222 away from the rear fixing sleeve 23 is a conical face, the conical face forms a funnel shape, the inner diameter of the cavity of the portion inside the sleeve 22 is gradually enlarged along the direction close to the liquid outlet 223 of the sleeve 22 by the conical face, so that the liquid on the transmission member 6 can move towards the liquid outlet 223 after being thrown to the conical face in the rotating process, and the liquid can be effectively prevented from flowing towards the motor 5 along the transmission member 6. Furthermore, the side wall of the cavity of the sleeve 22 between the liquid outlet 223 and the first separation ring 222 may also be a tapered surface, and is funnel-shaped, so that the inner diameter of the cavity in the portion of the sleeve 22 is gradually enlarged in the direction close to the liquid outlet 223 of the sleeve 22, so that the liquid can be thrown to the side wall of the sleeve 22 under the rotation action of the inner cutter holder 321 and the transmission member 6, and then enter the liquid outlet 223 along the inclined surface, and finally enter the inner cavity 11 of the housing 1.

Optionally, a second separation retaining ring 235 is disposed in the rear fixing sleeve 23, and a rotary sealing member is disposed between the power member and the second separation retaining ring 235 and sleeved on the rotating shaft 51. This arrangement prevents liquid from entering the motor 5 along the rotary shaft 51, contributing to an extension of the service life of the motor 5.

Optionally, the outer shell 1 and the sleeve 22 are in interference fit, an annular boss 224 is circumferentially arranged on the outer side of one end of the sleeve 22, and the annular boss 224 is used for limiting the outer shell 1; furthermore, the sleeve 22 is provided with a positioning hole near the annular boss 224, the housing 1 is provided with a positioning hole, the second positioning pin 14 penetrates through the positioning hole, and the positioning hole is matched with the second positioning pin 14 to prevent circumferential dislocation in the outer side installation process, so that the liquid outlet 223 is aligned with the inlet of the inner cavity 11.

Optionally, a second annular groove and a third annular groove are disposed on two sides of the liquid outlet 223 of the sleeve 22, and a third sealing ring 404 is sleeved in each of the second annular groove and the third annular groove. This arrangement prevents liquid from flowing between the sleeve 22 and the housing 1.

Optionally, a fluid connector 12 connects the external conduit to the inner cavity 11 for conducting fluid from the surgical procedure under the action of the negative pressure device. The housing cover 13 serves to enclose the electric machine 5 in the housing 1. Further, the housing cover 13 includes an inner cover 131 and an outer cover 132, the inner cover 131 is wrapped with a first cable having two ends extending out of the inner cover 131, one end of the first cable is used for connecting with a second cable of the motor 5, and the other end of the first cable is connected with an external power supply; the circumference of the inner cover 131 is stepped, one end of the outer cover 132 is provided with a flange, the outer cover 132 is sleeved outside the inner cover 131, the flange of the outer cover 132 can be matched with the step surface of the inner cover 131 to press the inner cover 131 to the housing 1, and the outer cover 132 is screwed with the housing 1. This arrangement makes the second cable not rotate around its axis during the process of closing the motor 5 to cause a winding, which improves the durability of the second cable. Further, can peg graft between inner cup 131 and the shell 1, specifically, the periphery of inner cup 131 is equipped with the arch, and the shell 1 inboard is equipped with the spout, and the arch can slide in the spout. This arrangement allows the outer cover 132 to be tightened without rotation of the inner cover 131, further ensuring that the second cable does not rotate about its axis.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A medical planing tool, comprising:

the tool comprises a tool handle (2), wherein the tool handle (2) comprises a sleeve (22) and a rear fixing sleeve (23), and the rear fixing sleeve (23) is fixed at one end of the sleeve (22);

the cutter (3) comprises an outer cutter (31) and an inner cutter (32), wherein the outer cutter (31) comprises an outer cutter holder (311), and the outer cutter holder (311) is arranged inside the sleeve (22) in a penetrating manner; a first sealing ring (401) is arranged between the outer cutter holder (311) and the sleeve (22);

the output end of the power part is connected with the inner cutter (32); one end face of the power part close to the output end is connected with one end of the rear fixing sleeve (23).

2. The medical plane blade as claimed in claim 1, wherein the handle (2) further comprises a front fixing sleeve (21), the front fixing sleeve (21) is fixed to the other end of the sleeve (22), a first shaft shoulder (3111) is arranged on the periphery of the outer blade holder (311), and the first shaft shoulder (3111) is located between the front fixing sleeve (21) and the sleeve (22).

3. Medical planer tool according to claim 2, characterized in that the first shoulder (3111) is provided with a first positioning element and the sleeve (22) is provided with a second positioning element, the first positioning element being fittable with the second positioning element.

4. The medical planer tool according to claim 1, wherein the rear fixing sleeve (23) is provided with a through hole (234) in the direction of the central line, one end of the power member is provided with a threaded hole, and a locking bolt can pass through the through hole (234) and is in threaded connection with the power member; the periphery of the rear fixing sleeve (23) is provided with threads, the inner side of the sleeve (22) is provided with threads, and the rear fixing sleeve (23) is in threaded connection with the sleeve (22).

5. Medical planer according to claim 4, characterized in that the rear harness (23) is stepped, the rear harness (23) comprising a first mounting part (231) and a second mounting part (232); the outer diameter of the first mounting part (231) is larger than that of the second mounting part (232), and the center line of the through hole (234) is positioned on the circumferential surface of the second mounting part (232); the second mounting part (232) penetrates through the sleeve (22) and is in threaded connection with the inner wall of the sleeve (22).

6. The medical planer tool of claim 5 wherein the rear retainer sleeve (23) further includes a third mounting portion (233) adjacent the second mounting portion (232), the outer diameter of the third mounting portion (233) being less than the outer diameter of the second mounting portion (232), a sealing assembly being provided between the third mounting portion (233) and the inner side of the sleeve (22).

7. The medical planer tool according to claim 6, wherein a first separation retaining ring (222) is arranged on the inner side of the sleeve (22) far away from the power element, the sealing assembly comprises two retaining rings (403) and a second sealing ring (402) which are sleeved on the rear fixing sleeve (23), the second sealing ring (402) is positioned between the two retaining rings (403), and the two retaining rings (403) are respectively abutted against the end faces of the first separation retaining ring (222) and the second mounting portion (232).

8. The medical planer tool according to claim 1, wherein the outer cutter (31) further comprises an outer cutter tube (312) provided at one end of the outer cutter holder (311), and the inner cutter (32) comprises an inner cutter holder (321) and an inner cutter tube (322) provided at one end of the inner cutter holder (321); the output of power spare is equipped with pivot (51), pivot (51) with interior blade holder (321) are connected, interior sword pipe (322) are located outside sword pipe (312) inside, and can outside sword pipe (312) inside rotation.

9. The medical plane blade of claim 8, further comprising a transmission member (6), wherein the transmission member (6) is a cylindrical structure, one end of the transmission member (6) is connected with the inner blade holder (321) in a clamping manner, and the other end of the transmission member (6) is fixedly connected with the rotating shaft (51).

10. The medical planer tool according to claim 8, wherein a second stop ring (235) is disposed in the rear fixing sleeve (23), and a rotary sealing member is disposed between the power member and the second stop ring (235) and sleeved on the rotating shaft (51).

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