CN116115300A

CN116115300A - Medical planing tool

Info

Publication number: CN116115300A
Application number: CN202211659956.3A
Authority: CN
Inventors: 张赟轩; 陈智; 俞威
Original assignee: Shanghai Ligetai Medical Equipment Co ltd
Current assignee: Shanghai Ligetai Medical Equipment Co ltd
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-05-16

Abstract

The invention provides a medical planing tool, which comprises an outer cutter and an inner cutter, wherein the outer cutter comprises an outer cutter head and an outer cutter tube which are connected, and the inner cutter comprises an inner cutter head and an inner cutter tube which are connected; the inner cutter head and the outer cutter head are hollow structures, one ends of the inner cutter head and the outer cutter head are respectively and coaxially connected with the outer cutter tube and the inner cutter tube, and the other ends of the inner cutter head and the outer cutter head are tapered structures with gradually shrinking walls to the end parts; an external cutting window is formed in the wall surface of the outer cutter head, two symmetrically arranged internal cutting windows are formed in the wall surface of the inner cutter head, and the side edges of the internal cutting windows form cutting edges; the middle part of the cutting edge deviates from the central axis, and the two ends of the cutting edge are gradually converged towards the central axis; the inner cutter is inserted into the outer cutter, the inner cutter head is positioned in the outer cutter head, the inner cutter can rotate relative to the outer cutter, and when the inner cutter rotates, the cutting edge at least partially extends out of the outer cutting window to cut.

Description

Medical planing tool

Technical Field

The invention relates to the technical field of medical instrument design, in particular to a medical planing tool.

Background

With the wide development of arthroscopic and endoscopic surgery, planing power systems are also rapidly developed and updated continuously. The modern planing power system is a high-performance universal surgical tool and has the advantages of smooth suction, convenient cleaning, quick installation, full waterproof design and the like. The planing device consists of two sleeves which are stacked together, wherein the two sleeves are provided with windows, the fixed outer cutter tube and the rotary inner core cut left and right at the window of the tip, tissues are sucked into the cutting edge, and scraps are sucked out through the suction device, so that the cutting purpose is achieved.

Among these, the planing tool bits are various, such as double-sided planing tools, full-diameter toothed planing tools, round head sanders, barrel sanders, and the like. The current tool bit on the market is a circular tool bit or an arc tool bit, which plays an important role in the tissue excision operation of the conventional lesion part. However, the human body has a complex structure, the planing cutters of the circular cutter head and the arc cutter head are difficult to detect a plurality of narrow compartments to effectively cut target tissues, and hidden troubles of smooth operation and postoperative rehabilitation are buried. In addition, the inner and outer knife tubes of the existing product are all made of metal materials, friction between the inner knife and the outer knife in the operation process can cause great temperature rise and generate metal abrasive particles, and hidden danger is buried for smooth operation and subsequent rehabilitation process.

Patent number CN201720020746.8 discloses a planing tool, the end of which planing tool bit is arc-shaped. During the operation, the end of the planing tool bit reaches the affected part, the inner tool rotates fast relative to the outer tool, the proliferated soft tissue is cut, and the cut tissue is taken out of the body. The defects are that:

1. the arc planer tool bit has large volume, and a plurality of lesion parts are difficult to detect in the operation process, so that target tissues of the parts cannot be effectively cut, and the hidden danger is buried for successful operation and postoperative rehabilitation.

2. The 'gold-to-gold' friction between the inner and outer blades of the planing tool can generate higher temperature, burn healthy tissues and bring unnecessary pain to patients.

3. The 'gold-to-gold' friction between the inner and outer blades of the planing tool can generate metal abrasive particles, and the worn abrasive particles remain in the human body to cause subsequent problems such as inflammation.

Patent number CN202821532U discloses a novel inside and outside planer tool and cooperation structure, and its structure of being connected with planing driving system handle adopts assembled structure, makes things convenient for the split and the washing of planer tool part. But it has the disadvantage that:

1. the multi-component structure adopts a plurality of damping rings to seal at the joint, but the sealing performance is still poor;

2. the tail part of the inner knife is relatively weak, and the structure not only provides a connection function with a handle of a power system but also provides a power transmission function in the operation process, so that the inner knife has higher damage risk;

3. the planing power system cannot automatically identify the type of the handle, and various parameters are required to be manually set and adjusted by doctors, so that the operation is complicated.

Disclosure of Invention

Aiming at the problems in the background technology, the invention provides a medical planing tool, which comprises an outer tool and an inner tool, wherein the outer tool comprises an outer tool bit and an outer tool pipe which are connected, and the inner tool comprises an inner tool bit and an inner tool pipe which are connected; the inner cutter head and the outer cutter head are hollow structures, one ends of the inner cutter head and the outer cutter head are respectively and coaxially connected with the outer cutter tube and the inner cutter tube, and the other ends of the inner cutter head and the outer cutter head are tapered structures with gradually shrinking walls to the end parts;

an external cutting window is formed in the wall surface of the outer cutter head, two symmetrically arranged internal cutting windows are formed in the wall surface of the inner cutter head, and the side edges of the internal cutting windows form cutting edges; the middle part of the cutting edge deviates from the central axis, and the two ends of the cutting edge are gradually converged towards the central axis; the inner cutter is inserted into the outer cutter, the inner cutter head is positioned in the outer cutter head, the inner cutter can rotate relative to the outer cutter, and when the inner cutter rotates, the cutting edge at least partially extends out of the outer cutting window to cut.

In some embodiments, the external cutting window is a beveled cut, and the beveled cut is disposed at an angle of 10-30 ° relative to the axial direction of the external cutting head.

In some embodiments, the outer wall surface of the outer cutter head is provided with a graduated scale along the length direction thereof.

In some embodiments, the outer cutter head and the outer cutter tube are respectively provided with a first step part and a first step hole which are matched, and the outer cutter tube and the outer cutter head are inserted into the first step hole through the first step part to realize positioning;

the inner cutter head and the inner cutter tube are respectively provided with a second step part and a second step hole which are matched with each other, and the inner cutter tube and the inner cutter head are inserted into the second step holes through the second step parts to realize positioning.

In some embodiments, a wear-resistant sleeve is further disposed between the outer cutter tube and the inner cutter tube, the wear-resistant sleeve wrapping over the outer diameter of the inner cutter tube.

In some embodiments, the wear sleeve has an outer diameter that is 0.06-0.1mm less than an inner diameter of the outer cutter tube.

In some embodiments, the wear sleeve is made of a polymeric material.

In some embodiments, the wear sleeve is made of a material that is a poly perfluoroethylene propylene resin.

In some embodiments, an outer cutter seat is provided on an end of the outer cutter tube remote from the outer cutter head, and an inner cutter seat is provided on an end of the inner cutter tube remote from the inner cutter head; the outer cutter holder is provided with a mounting hole communicated with the outer cutter tube, the inner cutter penetrates through the mounting hole to extend into the outer cutter, and one end, connected with the inner cutter holder, of the inner cutter extends into the mounting hole.

In some embodiments, the outer cutter holder is further provided with a connecting component used for being connected with the planing power system handle, the outer cutter holder is inserted into a mounting channel of the planing power system handle, the mounting is achieved through the connecting component, the inner cutter holder is connected with a power device in the planing power system handle, and the power device drives the inner cutter to rotate relative to the outer cutter through the inner cutter holder.

In some embodiments, the connection assembly comprises:

the cutting sleeve is sleeved on the outer ring of the outer cutter holder to realize installation;

one end of the clamping piece is connected with the clamping sleeve and extends along the direction parallel to the axial direction of the clamping sleeve; the utility model discloses a buckle spare, including outer blade holder, buckle spare is dorsad be provided with first buckle structure on one side of outer blade holder, be provided with the second buckle structure on the internal face of installation passageway, work as outer blade holder inserts in the installation passageway, first buckle structure with the lock is realized in second buckle structure lock joint.

In some embodiments, the connecting assembly further comprises an unlocking structure, wherein the unlocking structure is a boss structure arranged on one side of the clamping piece, which is away from the outer tool apron;

the clamping sleeve is sleeved on the outer cutter seat, and a gap is reserved between the clamping piece and the outer cutter seat; when the lock is unlocked, the boss structure is pressed, and the clamping piece moves towards the gap, so that the first clamping structure is separated from the second clamping structure.

In some embodiments, a sealing ring is arranged between the inner cutter holder and the mounting hole, the sealing ring is sleeved on the inner cutter holder, and after one end of the inner cutter holder extends into the mounting hole, one axial end of the sealing ring presses on the outer cutter holder to realize sealing between the mounting hole and the inner cutter holder; and after the sealing ring is connected with the planing power system handle, the outer ring of the sealing ring is attached to the inner wall of the installation channel to realize sealing.

In some embodiments, a groove structure is arranged on the outer wall of the inner tool holder, and the sealing ring is installed in the groove structure.

In some embodiments, at least one limiting protrusion is arranged on the inner ring of the sealing ring, a limiting hole is arranged in the groove structure corresponding to the limiting protrusion, and the limiting protrusion extends into the limiting hole.

In some embodiments, an identification device for identifying the type of the planing tool is further arranged on the outer wall surface of the outer tool holder, an identification device matched with the identification device is arranged on the planing power system handle, and the identification device identifies the identification device to determine the type of the planing tool after the planing tool is mounted on the planing power system handle through the outer tool holder.

In some embodiments, the identification device is at least one permanent magnet arranged on the outer cutter holder, different numbers of the permanent magnets and different positions of the permanent magnets are used for identifying different types of planing tools respectively, and the identification device adopts a chip, and the chip determines the type of the planing tools by identifying the positions and the numbers of the magnets.

In some embodiments, the end of the inner cutter holder away from the inner cutter tube adopts a double-pointed bifurcation structure, and the inner cutter holder is connected with a power device in the planing power system handle through the double-pointed bifurcation structure.

Compared with the prior art, the invention has the following advantages and positive effects due to the adoption of the technical scheme:

according to the medical planing tool provided by the invention, the inner tool bit and the outer tool bit are designed to be conical, so that the tool bit of the tool is easier to enter a narrow space and an aesthetic anatomical position which is difficult to reach in the surgical construction, and the problem of the position which is difficult to reach in the surgical position is solved; in addition, the structure design of the internal cutting edge enables the internal cutting edge to extend out of the external cutting window when rotating to the external cutting window, and the internal cutting edge and the external cutting window cooperate to finish the planing function; and the inner cutter head is provided with two inner cutting windows, and the inner cutter rotates for one circle, so that the target tissue can be cut twice, the cutting efficiency twice that of a common planing tool can be provided, and the planing efficiency is greatly improved.

Drawings

The above and other features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic view showing the disassembly of a medical planing tool provided by the invention;

FIG. 2 is a schematic cross-sectional view of a medical planing tool provided by the present invention;

FIG. 3 is a partial schematic view of a cutter head portion according to the present invention;

FIG. 4 is a schematic view of the outer cutter according to the present invention;

FIG. 5 is a schematic view of the structure of the inner cutter head according to the present invention;

FIG. 6 is a schematic view of a connecting assembly according to the present invention;

FIG. 7 is a cross-sectional view of the connection of the present invention to a planing power system handle;

FIG. 8 is a schematic view of a seal ring according to the present invention;

FIG. 9 is a schematic view of the structure of the inner holder of the present invention;

FIG. 10 is a schematic view of the connection of the outer and inner tool holders according to the present invention.

Detailed Description

The invention will be described in more detail hereinafter with reference to the accompanying drawings showing embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Referring to fig. 1-10, the invention provides a medical planing tool, which comprises an outer cutter 2 and an inner cutter 1, wherein the outer cutter 2 comprises an outer cutter head 11 and an outer cutter tube 9 which are connected, and the inner cutter 1 comprises an inner cutter head 10 and an inner cutter tube 8 which are connected; the inner cutter head 10 and the outer cutter head 11 are hollow structures, one ends of the inner cutter head 10 and the outer cutter head 11 are respectively coaxially connected with the outer cutter tube 9 and the inner cutter tube 8, and the other ends are tapered structures with gradually shrinking walls to the end parts; the wall surface of the outer cutter head 11 is provided with an outer cutting window 15, the wall surface of the inner cutter head 10 is provided with two symmetrically arranged inner cutting windows 16, and the side edges of the inner cutting windows 16 form cutting edges 14; the middle portion of the cutting edge 14 is disposed offset from the central axis, and both ends are gradually disposed toward the central axis in a converging manner, as shown in fig. 3 and 5; the inner cutter 1 is inserted into the outer cutter 2, the inner cutter head 10 is positioned in the outer cutter head 11, the inner cutter 1 can rotate relative to the outer cutter 2, and when the inner cutter 2 rotates, the cutting edge 14 at least partially extends out of the outer cutting window 15 to cut.

According to the medical planing tool provided by the invention, the inner tool bit 10 and the outer tool bit 11 are designed to be conical, so that the tool bit of the tool can more easily enter a narrow space and an aesthetic anatomical position which is difficult to reach in the operation construction, and the problem that the position which is difficult to reach in the operation position is solved; in addition, the structure design of the internal cutting edge enables the internal cutting edge to extend out of the external cutting window 15 when rotating to the external cutting window 15, and the external cutting window 15 and the internal cutting edge cooperate to finish the planing function; and the inner cutter head 10 is provided with two inner cutting windows 16, and the inner cutter rotates once to cut target tissues twice, so that the cutting efficiency of the common planing tool can be doubled, and the planing efficiency is greatly improved.

In this embodiment, as shown in fig. 4, the outer cutting window 15 is a bevel cut which is inclined with respect to the axial direction of the inner cutter by an angle of 10-30 °, preferably 20 °; of course, in other embodiments, the inclination angle may be adjusted according to the specific situation, which is not limited herein.

Further, the cutting profile of the outer cutting window 15 and the inner cutting window 16 is smooth, and hooking of the tissue can be avoided when the target tissue is cut in the narrow viewing chamber, thereby providing a more efficient and safer planing operation.

In the present embodiment, as shown in fig. 4, the outer wall surface of the outer cutter head 11 is provided with a scale 17 along the length direction thereof, wherein the scale 17 may extend further onto the outer cutter tube 9, without limitation; during the operation, the cutting depth of the cutter can be recognized by observing the numbers on the graduated scale 17, and the occurrence of a blind zone of the sight line in a narrow room is prevented, thereby affecting the cutting operation of a doctor.

In this embodiment, a first step portion is provided on the outer wall of one end of the outer cutter head 11 connected with the outer cutter tube 9, a matched first step hole is provided on the inner wall of the outer cutter tube 9, and when the outer cutter head 11 is connected with the outer cutter tube 9, accurate positioning is achieved in the first step hole through the first step portion, and then fixed connection is achieved through modes such as welding. Likewise, a second step part 27 is arranged on the outer wall of one end, connected with the inner cutter tube 8, of the inner cutter head 10, a matched second step hole is formed in the inner wall of the inner cutter tube 8, and when the inner cutter head 10 is connected with the inner cutter tube 8, the inner cutter head 10 is inserted into the second step hole through the second step part 27 to achieve accurate positioning, and then is fixedly connected in a welding mode and the like.

According to the invention, the connecting ends of the outer cutter head and the outer cutter tube and the connecting ends of the inner cutter head and the inner cutter tube are respectively provided with the step structures, so that the mounting and positioning between the outer cutter head and the outer cutter tube and the connecting ends of the inner cutter head and the inner cutter tube are realized, the subsequent welding operation and the like are facilitated, the welding difficulty is greatly reduced, and the coaxiality of the outer cutter head and the outer cutter tube and the coaxiality of the inner cutter head and the inner cutter tube after the outer cutter head and the inner cutter tube are connected are better ensured. Of course, in other embodiments, the connection manner between the outer cutter head and the outer cutter tube, and the connection manner between the inner cutter head and the inner cutter tube are not limited to the above, and may be adjusted according to the specific situation, which is not limited herein.

In this embodiment, the inner cutter head 10 and the outer cutter head 11 are made of materials different from those of the inner cutter tube 8 and the outer cutter tube 9, and the inner cutter head 10 and the outer cutter head 11 are made of martensitic stainless steel, and the inner cutter tube 8 and the outer cutter tube 9 are made of 304 stainless steel. (in addition to what advantageous effects the selection of the above materials are), of course, in other embodiments the selection of the materials of the inner cutter head 10, the outer cutter head 11, the inner cutter tube 8 and the outer cutter tube 9 may be adjusted according to the specific situation, and the present invention is not limited thereto.

In the embodiment, a wear-resistant sleeve 5 is also arranged between the outer cutter tube 9 and the inner cutter tube 8, and the outer diameter of the inner cutter tube 8 is coated with the specific wear-resistant sleeve 5; the setting of wear-resisting sleeve 5 is used for preventing direct collision between metal and metal when the inner knife tube rotates relative to the outer knife tube, so that the generation of metal abrasive particles is avoided, the subsequent hidden dangers such as inflammation caused by the metal abrasive particles are eliminated, the temperature rise between the inner knife and the outer knife caused by friction is reduced, and the burning of healthy tissues in the operation process is avoided.

Further, the outer diameter of the wear-resistant sleeve 5 is preferably smaller than the inner diameter of the outer cutter tube 9 by 0.06-0.1mm.

Further, the wear-resistant sleeve 5 is made of a high polymer material, and the wear-resistant sleeve 5 is preferably made of a poly-perfluoroethylene propylene resin. Of course, in other embodiments, other types of polymer materials may be used for the wear sleeve 5, which is not limited herein.

In this embodiment, an outer cutter holder 7 is disposed at one end of the outer cutter tube 9 away from the outer cutter head 11, an inner cutter holder 6 is disposed at one end of the inner cutter tube 8 away from the inner cutter head 10, and the inner cutter holder 6 and the inner cutter tube 8 are fixedly connected by injection molding between the outer cutter holder 7 and the outer cutter tube 9. The side wall of the inner cutter holder 6 is also provided with a suction window 24 communicated with the inner cutter tube 8, and the cut assembly is discharged from the suction window 24 after passing through the inner cutter tube 8.

Further, the outer cutter holder 7 is provided with a mounting hole communicated with the outer cutter tube 9, the inner cutter 1 penetrates through the mounting hole to extend into the outer cutter 2, and one end, connected with the inner cutter, of the inner cutter holder 6 extends into the mounting hole, so that the inner cutter and the outer cutter are mounted.

In the embodiment, the inner knife 1 and the outer knife 2 are assembled together and then connected with the planing power system handle 31; the outer cutter holder 7 is further provided with a connecting component 3 for connecting with the planing power system handle 31, the outer cutter holder 7 is inserted into a mounting channel of the planing power system handle 31, and the planing power system handle 31 is mounted through the connecting component; meanwhile, the inner cutter holder 6 is connected with a power device in the planing power system handle 31, and the power device drives the inner cutter to rotate relative to the outer cutter through the inner cutter holder 6.

Further, with reference to fig. 6 and 7, the connection assembly 3 in this embodiment includes a ferrule 18 and a fastener 19 disposed on the ferrule 18; the cutting sleeve 18 is of a circular sleeve structure and is sleeved on the outer ring of the outer cutter holder 7 to realize fixed installation; one end of the clamping piece 19 is connected with the clamping sleeve 18 and extends along the direction parallel to the axial direction of the clamping sleeve 18; the snap fastener 19 is provided with first buckle structure 20 on the side of outwards blade holder 7 dorsad, is provided with second buckle structure 21 on the internal face of installation passageway, after outer blade holder 7 inserts in the installation passageway, first buckle structure 20 and second buckle structure 21 lock to realize the locking between the two.

Further, the connecting assembly 3 further comprises an unlocking structure, wherein the unlocking structure is a boss structure 22 arranged on one side of the clamping piece 19, which is away from the outer tool apron 7; after the clamping sleeve 18 is sleeved on the outer cutter seat 7, a gap is reserved between the clamping piece 19 and the outer wall surface of the outer cutter seat 7, specifically, the gap can be formed by forming a groove on the outer wall surface of the outer cutter seat 7, and the like, and the gap can also be formed by adjusting the connection position between the clamping piece 19 and the clamping sleeve 18, so that the clamping sleeve is not limited. When unlocking, the boss structure 22 is pressed, and the fastener 19 moves in the gap, so that the first fastener structure 20 is separated from the second fastener structure 22, and unlocking is realized.

The connecting component 3 provided by the invention has a simple structure and is convenient to operate, stable connection between the planing tool and the planing power system handle 31 can be ensured, and the specific structural form of the connecting component can be adjusted according to specific conditions in other embodiments, and the connecting component is not limited herein.

In this embodiment, as shown in fig. 8-10, a sealing ring 4 is disposed between the inner cutter holder 6 and the mounting hole, the sealing ring 4 is sleeved on the inner cutter holder 6, and after one end of the inner cutter holder 6 extends into the mounting hole, one axial end of the sealing ring 4 presses against the upper end surface of the outer cutter holder 7 to realize sealing between the mounting hole and the inner cutter holder 6, as shown in fig. 10. And after being connected with the planing power system handle, the outer ring of the sealing ring 4 is attached to the inner wall of the installation channel to realize sealing.

Further, a groove structure 25 is arranged on one circle of the outer wall of the inner tool apron 6, and the sealing ring 4 is arranged in the groove structure 4 to realize axial limiting. Further, at least one limiting protrusion 23 is arranged on the inner ring of the sealing ring 4, a limiting hole 32 is formed in the groove structure 25 corresponding to the limiting protrusion 23, and the limiting protrusion 23 extends into the limiting hole 32 to achieve circumferential limiting.

According to the invention, through the arrangement of the sealing ring 4, the tightness between the planing tool and the power system handle is ensured, the sealing between the inner tool and the outer tool is ensured, the tissue sucked in the inner tool is prevented from leaking out from the joint of the outer tool holder and the inner tool holder, meanwhile, the damping is provided for the space between the inner tool holder and the outer tool holder by the sealing ring, and the problem that the inner tool falls off due to the mutual rotation of the inner tool and the outer tool is prevented.

In this embodiment, the end of the inner cutter holder 6 remote from the inner cutter tube 8 adopts a double-pointed bifurcation 26, and the inner cutter holder 6 is connected with a transmission part of a power device in a planing power system handle through the double-pointed bifurcation 26. In the embodiment, the tail part of the inner cutter holder 6 is designed into a double-pointed bifurcation structure, and the structure can automatically correct the power transmission structure in the planing power system handle when the planing cutter is connected with the handle, so that the planing power system handle is simple and convenient to install.

In this embodiment, the outer wall surface of the outer cutter holder 7 is further provided with a marking device 12 for marking the type of the planing tool, the planing power system handle is provided with a recognition device matched with the marking device 12, and the recognition device recognizes the marking device to determine the type of the planing tool after the planing tool is mounted on the planing power system handle 31 through the outer cutter holder 7.

Specifically, the marking device is at least one permanent magnet arranged on the outer cutter holder 7, a slotted hole is arranged on the outer wall surface of the outer cutter holder 7, and the permanent magnet is arranged in the slotted hole; the permanent magnets with different numbers, different positions and different arrangement modes are respectively used for marking planing tools with different models; the identification device adopts a chip, and the chip determines the model of the planing tool through the position, the number and the arrangement mode of the magnets for identification.

According to the invention, through the matching arrangement of the identification device and the chip, the endoscope control system in operation can acquire the model adopted by the cutter through identifying the number, the positions and the arrangement modes of the permanent magnets, so that the output power of the planing power system is further controlled.

It will be appreciated by those skilled in the art that the invention can be embodied in many other specific forms without departing from the spirit or scope thereof. Although embodiments of the present invention have been described, it is to be understood that the present invention should not be limited to these embodiments, but that variations and modifications can be made by one skilled in the art within the spirit and scope of the present invention as hereinafter defined in the appended claims.

Claims

1. The medical planing tool is characterized by comprising an outer cutter and an inner cutter, wherein the outer cutter comprises an outer cutter head and an outer cutter tube which are connected, and the inner cutter comprises an inner cutter head and an inner cutter tube which are connected; the inner cutter head and the outer cutter head are hollow structures, one ends of the inner cutter head and the outer cutter head are respectively and coaxially connected with the outer cutter tube and the inner cutter tube, and the other ends of the inner cutter head and the outer cutter head are tapered structures with gradually shrinking walls to the end parts;

2. A medical planing tool according to claim 1, wherein the external cutting window is a bevel cut, and the bevel cut is inclined relative to the axial direction of the external cutting head by an angle of 10-30 °.

3. The medical planing tool according to claim 1, wherein the outer wall surface of the outer cutter head is provided with a scale along a length direction thereof.

4. The medical planing tool according to claim 1, wherein the outer cutter head and the outer cutter tube are respectively provided with a first step part and a first step hole which are matched, and the outer cutter tube and the outer cutter head are inserted into the first step hole through the first step part to realize positioning;

5. The medical planing tool according to claim 1, wherein a wear resistant sleeve is further provided between the outer cutter tube and the inner cutter tube, the wear resistant sleeve being coated on the outer diameter of the inner cutter tube.

6. The medical planing tool according to claim 5, wherein the outer diameter of the wear resistant sleeve is less than the inner diameter of the outer cutter tube by 0.06-0.1mm.

7. The medical planing tool according to claim 5, wherein the wear resistant sleeve is made of a polymer material.

8. The medical planing tool according to claim 6, wherein the wear resistant sleeve is made of a material of a poly perfluoroethylene propylene resin.

9. The medical planing tool according to claim 1, wherein an outer cutter seat is provided on an end of the outer cutter tube remote from the outer cutter head, and an inner cutter seat is provided on an end of the inner cutter tube remote from the inner cutter head; the outer cutter holder is provided with a mounting hole communicated with the outer cutter tube, the inner cutter penetrates through the mounting hole to extend into the outer cutter, and one end, connected with the inner cutter holder, of the inner cutter extends into the mounting hole.

10. The medical planing tool according to claim 9, wherein the outer tool holder is further provided with a connecting assembly for connecting with a planing power system handle, the outer tool holder is inserted into a mounting channel of the planing power system handle, the mounting is achieved through the connecting assembly, the inner tool holder is connected with a power device in the planing power system handle, and the power device drives the inner tool to rotate relative to the outer tool through the inner tool holder.

11. The medical planing tool of claim 10, wherein the connection assembly comprises:

12. The medical planing tool according to claim 11, wherein the connection assembly further comprises an unlocking structure, the unlocking structure being a boss structure provided on a side of the clasp facing away from the outer blade seat;

13. The medical planing tool according to claim 10, wherein a sealing ring is arranged between the inner tool holder and the mounting hole, the sealing ring is sleeved on the inner tool holder, and after one end of the inner tool holder extends into the mounting hole, one axial end of the sealing ring presses the outer tool holder to seal the mounting hole and the inner tool holder; and after the sealing ring is connected with the planing power system handle, the outer ring of the sealing ring is attached to the inner wall of the installation channel to realize sealing.

14. The medical planing tool according to claim 13, wherein the outer wall of the inner holder is provided with a groove structure on one turn, the sealing ring being mounted in the groove structure.

15. The medical planing tool according to claim 14, wherein the sealing ring inner ring is provided with at least one limiting protrusion, a limiting hole is provided in the groove structure corresponding to the limiting protrusion, and the limiting protrusion extends into the limiting hole.

16. The medical planing tool according to claim 9, wherein the outer wall surface of the outer cutter holder is further provided with identification means for identifying the type of the planing tool, the planing power system handle is provided with identification means matched with the identification means, and the identification means identifies the identification means to determine the type of the planing tool after the planing tool is mounted on the planing power system handle through the outer cutter holder.

17. The medical planing tool according to claim 16, wherein the identification means is at least one permanent magnet provided on the outer holder, different numbers of the permanent magnets at different positions are used to identify different types of planing tools, respectively, and the identification means employs a chip which determines the type of planing tool by identifying the positions and numbers of the magnets.

18. The medical planing tool according to claim 10, wherein the end of the inner blade holder remote from the inner blade tube is of a double-pointed bifurcated structure, and the inner blade holder is connected with a power device in the planing power system handle through the double-pointed bifurcated structure.