CN116115300A - Medical planing tool - Google Patents

Abstract

The invention provides a medical planing cutter, which includes an outer cutter and an inner cutter, the outer cutter includes a connected outer cutter head and an outer cutter tube, and the inner cutter includes a connected inner cutter head and an inner cutter tube; Both the inner cutter head and the outer cutter head are hollow structures, and one end of the inner cutter head and the outer cutter head is respectively coaxially connected with the outer cutter tube and the inner cutter tube, and the other ends are both It is a tapered structure in which the wall surface gradually shrinks to the end; an outer cutting window is provided on the wall surface of the outer cutter head, and two symmetrically arranged inner cutting windows are provided on the wall surface of the inner cutter head, and the inner cutting window The side of the cutting edge constitutes the cutting edge; the middle part of the cutting edge is set away from the central axis, and the two ends gradually converge to the central axis; the inner knife is inserted in the outer knife, and the inner knife head is located at the The inner cutter is inside the outer cutter head, and the inner cutter can rotate relative to the outer cutter. When the inner cutter rotates, the cutting edge at least partially extends out of the outer cutting window for cutting.

Description

A kind of medical planing knife

technical field

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

Background technique

With the widespread development of arthroscopic and endoscopic surgery, the planing power system is also developing rapidly and constantly updated. The modern planing power system is a high-performance general-purpose surgical tool, which has the advantages of smooth suction, convenient cleaning, quick installation and fully waterproof design. The planer is composed of two stacked sleeves, both of which have windows, cut left and right through the window at the tip through the fixed outer knife tube and the rotating inner core, and suck the tissue into the cutting edge, through the suction The chip is sucked out by the device to achieve the purpose of cutting.

Among them, there are many types of planing cutter heads, such as double-sided planers, full-diameter planers, full-diameter toothed planers, round-end grinders or barrel-type grinders. At present, the cutter heads on the market are all round or arc-shaped cutter heads, which play an important role in the tissue resection of conventional lesion sites. However, the structure of the human body is complex, and it is difficult for planing knives with round and curved heads to reach many narrow compartments to effectively remove the target tissue, burying hidden dangers for smooth operation and postoperative recovery. In addition, the inner and outer knife tubes of existing products are all metal materials. During the operation, the friction between the inner and outer knife will cause a substantial increase in temperature and produce metal abrasive particles, which will bury hidden dangers for the smooth progress of the operation and the subsequent rehabilitation process.

The patent No. CN201720020746.8 discloses a planing tool, the end of the planing tool head is an arc-shaped structure. During the operation, the end of the planer head reaches the lesion site, and the inner knife rotates rapidly relative to the outer knife to cut the hyperplastic soft tissue and take the excised tissue out of the body. Its flaws are:

1. The arc-shaped planer head is bulky, and it is difficult to reach many lesion parts during the operation, resulting in the ineffective cutting of the target tissue in this part, which lays hidden dangers for the successful operation and postoperative recovery.

2. The "gold-to-gold" friction between the inner and outer knives of the planer will generate higher temperatures, burn healthy tissues, and bring unnecessary pain to patients.

3. The "gold-to-gold" friction between the inner and outer knives of the planer will produce metal abrasive particles, and the abrasive particles remaining in the human body will cause follow-up problems such as inflammation.

The patent No. CN202821532U discloses a new type of internal and external planer and its matching structure. The structure connected to the handle of the planing power system adopts an assembled structure, which is convenient for the disassembly and cleaning of the planer parts. But its flaws are:

1. Although this multi-component structure adopts multiple damping rings for sealing at the connection, the sealing performance is still poor;

2. The tail structure of the inner knife is relatively weak. During the operation, the structure not only provides the connection function with the power system handle but also provides the power transmission function, which has a high risk of damage;

3. The planing power system cannot automatically identify the handle type, and various parameters need to be manually set and adjusted by the doctor, which is cumbersome to operate.

Contents of the invention

Aiming at the problems in the background technology, the present invention provides a medical planing cutter, which includes an outer cutter and an inner cutter, the outer cutter includes a connected outer cutter head and an outer cutter tube, and the inner cutter includes a connected inner cutter A cutter head and an inner cutter tube; the inner cutter head and the outer cutter head are hollow structures, and one end of the inner cutter head and the outer cutter head is respectively connected to the outer cutter tube and the inner cutter tube Coaxial connection, the other end is a tapered structure in which the wall gradually shrinks to the end;

The wall of the outer cutter head is provided with an outer cutting window, and the wall of the inner cutter head is provided with two symmetrically arranged inner cutting windows, and the sides of the inner cutting windows form a cutting edge; the cutting edge The middle part of the central axis is deviated from the central axis, and the two ends are gradually converged to the central axis; the inner knife is inserted in the outer knife, the inner knife head is located in the outer knife head, and the inner knife can be opposite When the outer knife rotates and the inner knife rotates, the cutting edge at least partially extends out of the outer cutting window for cutting.

In some embodiments, the outer cutting window is a beveled notch, and the beveled notch is inclined relative to the axial direction of the outer cutter head, and the inclination angle is 10-30°.

In some embodiments, a scale is provided on the outer wall of the outer cutter head along its length direction.

In some embodiments, the outer cutter head and the connecting end of the outer cutter tube are respectively provided with a matching first stepped portion and a first stepped hole, and the connection between the outer cutter tube and the outer cutter head passes through the The first stepped portion is inserted into the first stepped hole to achieve positioning;

The inner cutter head and the connecting end of the inner cutter tube are respectively provided with a matching second step portion and a second step hole, and the inner cutter tube and the inner cutter head are inserted through the second step portion. It is arranged in the second stepped hole to realize positioning.

In some embodiments, a wear-resistant sleeve is further provided between the outer knife tube and the inner knife tube, and the wear-resistant sleeve covers the outer diameter of the inner knife tube.

In some embodiments, the outer diameter of the wear-resistant sleeve is 0.06-0.1 mm smaller than the inner diameter of the outer knife tube.

In some embodiments, the wear-resistant sleeve is made of polymer material.

In some embodiments, the wear-resistant sleeve is made of polyperfluoroethylene propylene resin.

In some embodiments, an outer knife seat is provided on the end of the outer knife tube away from the outer knife head, and an inner knife seat is set on the end of the inner knife tube away from the inner knife head; the outer knife An installation hole communicating with the outer knife tube is provided on the seat, the inner knife extends into the outer knife through the installation hole, and one end of the inner knife seat connected to the inner knife extends into the inside the mounting hole.

In some embodiments, the outer knife seat is also provided with a connection assembly for connecting with the handle of the planing power system, and the outer knife seat is inserted into the installation channel of the handle of the planing power system, through the The connecting assembly realizes the installation, and the inner knife seat is connected with the power device in the handle of the planing power system, and the power device drives the inner knife to rotate relative to the outer knife through the inner knife seat.

In some embodiments, the connection components include:

A ferrule sleeve is set on the outer ring of the outer knife seat to realize installation;

A buckle, one end of which is connected to the ferrule, and is extended in a direction parallel to the axial direction of the ferrule; the side of the buckle facing away from the outer knife seat is provided with a first buckle structure, The inner wall surface of the installation channel is provided with a second buckle structure, and when the outer knife holder is inserted into the installation channel, the first buckle structure is buckled with the second buckle structure to achieve locking .

In some embodiments, the connection assembly further includes an unlocking structure, and the unlocking structure is a boss structure provided on the side of the buckle member facing away from the outer knife seat;

The ferrule is sleeved on the outer knife seat, and there is a gap between the buckle and the outer knife seat; when unlocking, press the boss structure, and the buckle will move toward the gap move inward, so that the first buckle structure is separated from the second buckle structure.

In some embodiments, a sealing ring is provided between the inner knife seat and the installation hole, the sealing ring is sleeved on the inner knife seat, and one end of the inner knife seat extends into the installation hole , the axial end of the sealing ring is pressed on the outer tool seat to realize the sealing between the installation hole and the inner tool seat; and after connecting with the handle of the planing power system, the outer ring of the sealing ring and the The inner wall of the above-mentioned installation channel is adhered to realize sealing.

In some embodiments, a groove structure is provided on a circle of the outer wall of the inner knife seat, and the sealing ring is installed in the groove structure.

In some embodiments, the inner ring of the sealing ring is provided with at least one position-limiting protrusion, and a position-limiting hole is provided in the groove structure corresponding to the position-limiting protrusion, and the position-limiting protrusion protrudes into inside the limiting hole.

In some embodiments, an identification device for identifying the model of the planing tool is also provided on the outer wall of the outer tool seat, and an identification device matching the identification device is provided on the handle of the planing power system. After the tool is installed on the handle of the planing power system through the outer tool seat, the identification device identifies the identification device to determine the model of the planing tool.

In some embodiments, the identification device is at least one permanent magnet arranged on the outer tool seat, and the permanent magnets of different numbers and positions are used to identify different types of planing tools, and the identification device adopts a chip , the chip determines the model of the planing tool by identifying the position and number of the magnets.

In some embodiments, the end of the inner knife seat away from the inner knife tube adopts a double-pronged fork structure, and the inner knife seat uses the power in the handle of the planing power system through the double-pronged fork structure. device connection.

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

The medical planing cutter provided by the present invention has the inner cutter head and the outer cutter head designed to be tapered, so that the cutter head of the cutter can more easily enter the narrow space and the difficult-to-reach adjudication anatomical position in the operation configuration, and solve the problem of surgical site The problem of the position that is difficult to reach; moreover, the present invention, through the structural design of the inner cutting edge, can stretch out the outer cutting window when it is rotated to the outer cutting window, and the two cooperate to complete the planing function; and the inner cutter head There are two inner cutting windows, the inner knife rotates once, can cut the target tissue twice, can provide twice the cutting efficiency of the ordinary planer, and greatly improves the planing efficiency.

Description of drawings

The above and other features and advantages of the present invention can be more clearly understood through the following detailed description in conjunction with the accompanying drawings, wherein:

Fig. 1 is the dismantling schematic diagram of medical planer cutter provided by the present invention;

Fig. 2 is the schematic sectional view of the medical planing tool provided by the present invention;

Fig. 3 is the local schematic diagram of cutter head among the present invention;

Fig. 4 is the structural representation of outer cutter head in the present invention;

Fig. 5 is the structural representation of inner cutter head among the present invention;

Fig. 6 is a schematic structural view of the connection assembly in the present invention;

Fig. 7 is a cross-sectional view of the connection between the present invention and the handle of the planing power system;

Fig. 8 is a structural schematic diagram of a sealing ring in the present invention;

Fig. 9 is a schematic structural view of the inner knife seat in the present invention;

Fig. 10 is a schematic diagram of the connection between the outer knife seat and the inner knife seat in the present invention.

Detailed ways

The invention will be described in more detail hereinafter with reference to the accompanying drawings showing embodiments of the invention. However, this invention may 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 these drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

With reference to Fig. 1-10, the present invention provides a kind of medical planer cutter, comprises outer cutter 2 and inner cutter 1, and outer cutter 2 comprises outer cutter head 11 and outer cutter tube 9 that are connected, and inner cutter 1 includes connected The inner cutter head 10 and the inner cutter tube 8; the inner cutter head 10 and the outer cutter head 11 are both hollow structures, and one end of the inner cutter head 10 and the outer cutter head 11 is respectively coaxially connected with the outer cutter tube 9 and the inner cutter tube 8 , and the other end is a tapered structure in which the wall surface gradually shrinks to the end; an outer cutting window 15 is provided on the wall surface of the outer cutter head 11, and two symmetrically arranged inner cutting windows 16 are provided on the wall surface of the inner cutter head 10. The sides of the cutting window 16 form the cutting edge 14; the middle part of the cutting edge 14 deviates from the central axis, and the two ends gradually converge to the central axis, as shown in Figures 3 and 5; the inner knife 1 is inserted into the outer knife 2, the inner cutter head 10 is located in the outer cutter head 11, and the inner cutter 1 can rotate relative to the outer cutter 2. When the inner cutter 2 rotates, the cutting edge 14 at least partially extends out of the outer cutting window 15 for cutting.

In the medical planing tool provided by the present invention, the inner cutter head 10 and the outer cutter head 11 are designed to be tapered, so that the cutter head of the cutter can more easily enter the narrow space and the difficult-to-reach trial anatomical position in the operation configuration, and solve the problem The problem of the difficult-to-reach position of the surgical site; and, through the structural design of the inner cutting edge, the present invention can extend the outer cutting window 15 when it rotates to the outer cutting window 15, and the two cooperate to complete the planing function; Moreover, the inner cutter head 10 is provided with two inner cutting windows 16, and the inner cutter rotates once to cut the target tissue twice, which can provide twice the cutting efficiency of the ordinary planer, and greatly improves the planing efficiency.

In the present embodiment, as shown in Figure 4, the outer cutting window 15 is a beveled incision, which is inclined relative to the axial direction of the inner knife, and the inclination angle is 10-30°, preferably 20°; In other embodiments, the inclination angle can also be adjusted according to specific conditions, which is not limited here.

Further, the cutting contours of the outer cutting window 15 and the inner cutting window 16 are smooth, which can avoid hooking tissue when cutting the target tissue in a narrow compartment, thereby providing a more efficient and safer planing operation.

In this embodiment, as shown in Figure 4, the outer wall surface of the outer cutter head 11 is provided with a scale scale 17 along its length direction, wherein the scale scale 17 can also be further extended to the outer knife tube 9, which is not done here. Restrictions: During the operation, the cutting depth of the knife can be identified by observing the numbers on the scale scale 17, so as to prevent blind spots in the narrow compartment from affecting the doctor's cutting operation.

In this embodiment, a first stepped portion is provided on the outer wall of the end where the outer cutter head 11 is connected to the outer cutter tube 9, and a matching first stepped hole is provided on the inner wall of the outer cutter tube 9, and the outer cutter head 11 is connected to the outer cutter tube 9 When the knife tube 9 is connected, the first step is inserted into the first step hole to achieve precise positioning, and then fixedly connected by welding or the like. Similarly, the outer wall of the end where the inner cutter head 10 is connected to the inner cutter tube 8 is provided with a second step portion 27, and the inner wall of the inner cutter tube 8 is provided with a matching second step hole, and the inner cutter head 10 and the inner cutter tube 8. During the connection, the second step portion 27 is inserted into the second step hole to realize precise positioning, and then fixedly connected by welding or the like.

In the present invention, the connecting ends of the outer cutter head and the outer cutter tube, and the inner cutter head and the inner cutter tube are provided with step structures to realize the installation and positioning between the two, so as to facilitate subsequent welding operations and greatly reduce the The difficulty of welding better ensures the coaxiality after the connection between the outer cutter head and the outer cutter tube, and the inner cutter head and the inner cutter tube. Of course, in other embodiments, the connections between the outer cutter head and the outer cutter tube, and the inner cutter head and the inner cutter tube are not limited to the above, and can be adjusted according to specific conditions, which is not limited here.

In this embodiment, the materials selected for the inner cutter head 10 and the outer cutter head 11 are different from the materials selected for use in the inner cutter tube 8 and the outer cutter tube 9. Specifically, the materials selected for the inner cutter head 10 and the outer cutter head 11 are martensitic stainless steel. The inner cutter tube 8 and the outer cutter tube 9 are made of 304 stainless steel. (What beneficial effect does the selection of the above-mentioned materials have under the supplement) Of course, in other embodiments, the selection of the inner cutter head 10, the outer cutter head 11, the inner cutter tube 8 and the outer cutter tube 9 materials can also be adjusted according to specific conditions. There are no restrictions.

In this embodiment, a wear-resistant sleeve 5 is also provided between the outer knife tube 9 and the inner knife tube 8, and the specific wear-resistant sleeve 5 is coated on the outer diameter of the inner knife tube 8; The setting of grinding casing 5 is used to prevent direct collision between metal and metal when the inner knife tube rotates relative to the outer knife tube, avoiding the generation of metal abrasive grains, eliminating follow-up hidden dangers such as inflammation caused by metal abrasive grains, and at the same time It reduces the temperature rise caused by friction between the inner and outer blades, and avoids burning of healthy tissues during the operation.

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

Further, the material of the wear-resistant sleeve 5 is a polymer material, preferably the material of the wear-resistant sleeve 5 is polyperfluoroethylene propylene resin. Of course, in other embodiments, the wear-resistant sleeve 5 can also be made of other types of polymer materials, which is not limited here.

In this embodiment, an outer knife seat 7 is arranged on the end of the outer knife tube 9 away from the outer knife head 11, and an inner knife seat 6 is arranged on an end of the inner knife tube 8 away from the inner knife head 10. Specifically, the outer knife seat 7 Between the outer knife tube 9, the inner knife seat 6 and the inner knife tube 8, all can be fixedly connected by injection molding. A suction window 24 communicating with the inner knife tube 8 is also provided on the side wall of the inner knife seat 6 , and the cut assembly is discharged from the suction window 24 after passing through the inner knife tube 8 .

Further, the outer knife seat 7 is provided with a mounting hole communicating with the outer knife tube 9, the inner knife 1 extends into the outer knife 2 through the mounting hole, and the end of the inner knife seat 6 connected to the inner knife extends into the mounting hole, Realize the installation of inner knife and outer knife.

In this embodiment, after the inner knife 1 and the outer knife 2 are assembled together, they are connected to the handle 31 of the planing power system; Component 3, the outer knife seat 7 is inserted into the installation channel of the handle 31 of the planing power system, and the installation is realized through the connecting component; at the same time, the inner knife seat 6 is connected with the power device in the handle 31 of the planing power system, and the power device passes through the inner The knife seat 6 drives the inner knife to rotate relative to the outer knife.

Further, referring to Fig. 6 and Fig. 7, the connection assembly 3 in this embodiment includes a ferrule 18 and a buckle 19 arranged on the ferrule 18; the ferrule 18 is a ring-shaped sleeve structure, which is sleeved on the outer knife The outer ring of the seat 7 is fixedly installed; one end of the buckle 19 is connected to the ferrule 18, and is extended in a direction parallel to the axial direction of the ferrule 18; the side of the buckle 19 facing away from the outer knife seat 7 is provided with The first buckle structure 20, the inner wall surface of the installation channel is provided with a second buckle structure 21, when the outer knife seat 7 is inserted into the installation channel, the first buckle structure 20 is buckled with the second buckle structure 21, Thus achieving a lock between the two.

Further, the connection assembly 3 also includes an unlocking structure, which is a boss structure 22 arranged on the side of the buckle 19 facing away from the outer knife seat 7; There is a gap between the fastener 19 and the outer wall of the outer knife seat 7. Specifically, the gap can be formed by opening a groove on the outer wall of the outer knife seat 7, or by adjusting the buckle 19 and the ferrule 18. The gaps are formed by connecting positions between them, which is not limited here. When unlocking, press the boss structure 22, and the buckle 19 moves into the gap, so that the first buckle structure 20 is separated from the second buckle structure 22, thereby realizing unlocking.

The connection assembly 3 provided by the present invention is simple in structure, easy to operate, and can ensure a stable connection between the planing tool and the handle 31 of the planing power system. Of course, in other embodiments, the specific structural form of the connection assembly can also be adjusted according to specific conditions. , there is no restriction here.

In this implementation, as shown in Figure 8-10, a sealing ring 4 is provided between the inner knife seat 6 and the installation hole, the sealing ring 4 is set on the inner knife seat 6, and one end of the inner knife seat 6 extends into the installation hole After the inside, one axial end of the sealing ring 4 is pressed against the upper end surface of the outer knife seat 7 to realize the sealing between the installation hole and the inner knife seat 6, as shown in FIG. 10 . And after being connected with the handle of the planing power system, 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 provided on a circle of the outer wall of the inner knife seat 6, and the sealing ring 4 is installed in the groove structure 4 to realize the limit in the axial direction. Further, at least one position-limiting protrusion 23 is provided on the inner ring of the sealing ring 4 , and a position-limiting hole 32 is provided in the groove structure 25 corresponding to the position-limiting protrusion 23 , and the position-limiting protrusion 23 extends into the position-limiting hole 32 , to realize the circumferential limit.

The present invention not only ensures the sealing between the planing tool and the handle of the power system through the setting of the sealing ring 4, but also ensures the sealing between the inner knife and the outer knife, and prevents the tissue absorbed by the inner knife from the outer knife seat and the inner knife. The joint of the knife seat leaks out, and the sealing ring also provides damping between the inner knife seat and the outer knife seat to prevent the mutual rotation of the inner knife and the outer knife, which is the problem of the inner knife falling off.

In this embodiment, the end of the inner knife seat 6 away from the inner knife tube 8 adopts a double-pronged fork structure 26, and the inner knife seat 6 is connected to the transmission part of the power device in the handle of the planing power system through the double-pronged fork structure 26 . In this embodiment, the tail of the inner knife seat 6 is designed as a bifurcated structure, which can automatically correct the power transmission structure inside the handle of the planing power system when the planing tool is connected to the handle, and is easy to install.

In this embodiment, an identification device 12 for identifying the model of the planing tool is also provided on the outer wall of the outer knife seat 7, and an identification device matching the identification device 12 is provided on the handle of the planing power system. After the tool holder 7 is installed on the handle 31 of the planing power system, the identification device recognizes the identification device to determine the model of the planing tool.

Specifically, the identification device is at least one permanent magnet arranged on the outer knife seat 7, and the outer wall surface of the outer knife seat 7 is provided with slotted holes, and the permanent magnets are installed in the slotted holes; permanent magnets with different numbers, different positions, and different arrangements The magnets are respectively used to identify different types of planing tools; the identification device adopts a chip, and the chip determines the type of the planing tool through the position, number and arrangement of the magnets used for identification.

In the present invention, through the cooperative setting of the identification device and the chip, the endoscope control system in the operation can know the model of the cutting tool by identifying the number, position and arrangement of the permanent magnets, so as to further control the output power of the planing power system.

Those skilled in the art will appreciate that the present invention may be embodied in many other specific forms without departing from its own spirit or scope. Although the embodiments of the present invention have been described, it should be understood that the present invention should not be limited to these embodiments, and that changes and modifications can be made by those skilled in the art within the spirit and scope of the invention as defined by the appended claims.

Claims (18)

1. A medical planing cutter, characterized in that, includes an outer cutter and an inner cutter, the outer cutter includes a connected outer cutter head and an outer cutter tube, and the inner cutter includes a connected inner cutter head and an inner cutter tube; the inner cutter head and the outer cutter head are both hollow structures, and one end of the inner cutter head and the outer cutter head is respectively coaxially connected with the outer cutter tube and the inner cutter tube; One end is a tapered structure in which the wall gradually shrinks to the end; The wall of the outer cutter head is provided with an outer cutting window, and the wall of the inner cutter head is provided with two symmetrically arranged inner cutting windows, and the sides of the inner cutting windows form a cutting edge; the cutting edge The middle part of the central axis is deviated from the central axis, and the two ends are gradually converged to the central axis; the inner knife is inserted in the outer knife, the inner knife head is located in the outer knife head, and the inner knife can be opposite When the outer knife rotates and the inner knife rotates, the cutting edge at least partially extends out of the outer cutting window for cutting. 2. The medical planing tool according to claim 1, wherein the outer cutting window is a beveled incision, and the beveled incision is arranged obliquely relative to the axial direction of the outer cutter head, and the inclination angle is 10° -30°. 3. The medical planing tool according to claim 1, characterized in that, a scale scale is arranged on the outer wall surface of the outer cutter head along its length direction. 4. The medical planing tool according to claim 1, characterized in that, the outer cutter head and the connecting end of the outer cutter tube are respectively provided with a matching first stepped portion and a first stepped hole, and the outer cutter head The positioning between the knife tube and the outer knife head is achieved by inserting the first stepped portion into the first stepped hole; The inner cutter head and the connecting end of the inner cutter tube are respectively provided with a matching second step portion and a second step hole, and the inner cutter tube and the inner cutter head are inserted through the second step portion. It is arranged in the second stepped hole to realize positioning. 5. The medical planing tool according to claim 1, characterized in that, a wear-resistant sleeve is also arranged between the outer knife tube and the inner knife tube, and the wear-resistant sleeve covers the on the outer diameter of the inner knife tube. 6. The medical planing tool according to claim 5, wherein the outer diameter of the wear-resistant sleeve is 0.06-0.1 mm smaller than the inner diameter of the outer knife tube. 7. The medical planing tool according to claim 5, characterized in that, the material of the wear-resistant sleeve is a polymer material. 8. The medical planing tool according to claim 6, characterized in that, the wear-resistant sleeve is made of polyperfluoroethylene propylene resin. 9. The medical planing tool according to claim 1, characterized in that, the end of the outer knife tube away from the outer knife head is provided with an outer knife seat, and the inner knife tube is far away from the end of the inner knife head. One end is provided with an inner knife seat; the outer knife seat is provided with a mounting hole communicating with the outer knife tube, the inner knife extends into the outer knife through the mounting hole, and the inner knife One end of the seat connected to the inner knife extends into the installation hole. 10. The medical planing tool according to claim 9, characterized in that, the outer knife seat is also provided with a connection assembly for connecting with the handle of the planing power system, and the outer knife seat is inserted into the planer In the installation channel of the handle of the planing power system, the installation is realized through the connecting assembly. The inner knife seat is connected with the power device in the handle of the planing power system, and the power device drives the inner tool seat through the inner knife seat. The knife rotates relative to the outer knife. 11. The medical planer according to claim 10, wherein the connection assembly comprises: A ferrule sleeve is set on the outer ring of the outer knife seat to realize installation; A buckle, one end of which is connected to the ferrule, and is extended in a direction parallel to the axial direction of the ferrule; the side of the buckle facing away from the outer knife seat is provided with a first buckle structure, The inner wall surface of the installation channel is provided with a second buckle structure, and when the outer knife holder is inserted into the installation channel, the first buckle structure is buckled with the second buckle structure to achieve locking . 12. The medical planing tool according to claim 11, wherein the connecting assembly further includes an unlocking structure, and the unlocking structure is arranged on the side of the buckle facing away from the outer knife seat The boss structure on the The ferrule is sleeved on the outer knife seat, and there is a gap between the buckle and the outer knife seat; when unlocking, press the boss structure, and the buckle will move toward the gap move inward, so that the first buckle structure is separated from the second buckle structure. 13. The medical planing tool according to claim 10, characterized in that a sealing ring is provided between the inner knife seat and the mounting hole, and the sealing ring is sleeved on the inner knife seat, the After one end of the inner knife seat extends into the installation hole, the axial end of the sealing ring is pressed on the outer knife seat to realize the sealing between the installation hole and the inner knife seat; and it is connected with the planing power system handle After the connection, the outer ring of the sealing ring is attached to the inner wall of the installation channel to achieve sealing. 14. The medical planing tool according to claim 13, wherein a groove structure is provided on a circle of the outer wall of the inner knife seat, and the sealing ring is installed in the groove structure. 15. The medical planing tool according to claim 14, characterized in that at least one limiting protrusion is provided on the inner ring of the sealing ring, and a position corresponding to the limiting protrusion is provided in the groove structure A limit hole is defined, and the limit protrusion protrudes into the limit hole. 16. The medical planing tool according to claim 9, characterized in that, an identification device for identifying the model of the planing tool is also provided on the outer wall of the outer knife seat, and the handle of the planing power system is provided with An identification device matched with the identification device, after the planing tool is installed on the handle of the planing power system through the outer tool holder, the identification device identifies the identification device to determine the model of the planing tool. 17. The medical planing tool according to claim 16, wherein the marking device is at least one permanent magnet arranged on the outer knife seat, and permanent magnets of different numbers and positions are used to mark different For a planing tool of a model, the identification device adopts a chip, and the chip determines the model of the planing tool by identifying the position and number of the magnets. 18. The medical planing tool according to claim 10, characterized in that, the end of the inner knife seat far away from the inner knife tube adopts a double-pronged fork structure, and the inner knife seat passes through the double-pronged fork The structure is connected with the power device in the handle of the planing power system.

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