A medical planer

Abstract

The present invention relates to the technical field of medical devices, and specifically discloses a medical planer, which includes a handle, a tool and a power member, wherein the handle includes a sleeve and a rear fixing sleeve, and the rear fixing sleeve is fixed to one end of the sleeve; the tool includes an outer tool and an inner tool, wherein the outer tool includes an outer tool holder, and the outer tool holder is inserted into the sleeve; a first sealing ring is provided between the outer tool holder and the sleeve; the output end of the power member is connected to the inner tool; and an end face of the power member close to the output end is connected to one end of the rear fixing sleeve. The medical planer reduces the machining accuracy requirements of the outer tool holder and the sleeve when the outer tool holder and the sleeve are assembled, reduces the machining cost, and can prevent the liquid inside the sleeve from flowing out through the connection between the two.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, in particular to a medical planer. Background Art

[0002] The medical planing system is a tool used in minimally invasive endoscopic surgery. It is a surgical power device used to plane biological bone tissue and / or soft tissue in surgery, orthopedics, otolaryngology, and cosmetic surgery. Its planing head consists of an internal rotating part and an external fixed part with a window; the medical planing system is powered by a main power supply, and the main unit controls the electrically driven medical planer; the main unit generates suction through the negative pressure device built into the main unit, and discharges the planed biological tissue from the body through the channel in the tool. The planer consists of a handle and a tool; the handle has a motor with a reducer built into it, which is connected to the main unit through cables and air pipes.

[0003] The outer tool and handle of the existing planer are connected by a conical surface matching method. On the one hand, this connection method has high requirements on processing accuracy, resulting in great processing difficulty, which in turn leads to high processing costs, and is prone to the problem of liquid leakage. Summary of the invention

[0004] The purpose of the present invention is to provide a medical planer to solve the problems of high machining accuracy, great difficulty, high cost and easy leakage of liquid at the connection between the outer tool and the handle.

[0005] The present invention provides a medical planer, which comprises:

[0006] A knife handle, the knife handle comprising a sleeve and a rear fixing sleeve, the rear fixing sleeve being fixed to one end of the sleeve;

[0007] A tool, the tool comprising an outer tool and an inner tool, wherein the outer tool comprises an outer tool holder, the outer tool holder is inserted into the sleeve, and a first sealing ring is provided between the outer tool holder and the sleeve;

[0008] A power piece, the output end of which is connected to the inner cutter; an end surface of the power piece close to the output end is connected to one end of the rear fixing sleeve.

[0009] Optionally, the tool handle further comprises a front fixing sleeve, wherein the front fixing sleeve is fixed to the other end of the sleeve, and a first shaft shoulder is provided on the outer periphery of the outer tool seat, wherein the first shaft shoulder is located between the front fixing sleeve and the sleeve.

[0010] Optionally, the first shaft shoulder is provided with a first positioning piece, and the sleeve is provided with a second positioning piece, and the first positioning piece can be plug-fitted with the second positioning piece.

[0011] Optionally, the rear fixing sleeve is provided with a through hole around the center line direction, and one end of the power part is provided with a threaded hole, and a locking bolt can pass through the through hole and be threadedly connected to the power part; the outer periphery of the rear fixing sleeve is provided with a thread, and the inner side of the sleeve is provided with a thread, and the rear fixing sleeve is threadedly connected to the sleeve.

[0012] Optionally, the rear fixing sleeve is stepped, and includes a first mounting portion and a second mounting portion; the outer diameter of the first mounting portion is greater than the outer diameter of the second mounting portion, and the center line of the through hole is located on the circumferential surface of the second mounting portion; the second mounting portion is inserted into the sleeve and is threadedly connected to the inner wall of the sleeve.

[0013] Optionally, the rear fixing sleeve further includes a third mounting portion adjacent to the second mounting portion, the outer diameter of the third mounting portion is smaller than the outer diameter of the second mounting portion, and a sealing assembly is provided between the third mounting portion and the inner side surface of the sleeve.

[0014] Optionally, a first spacer ring is provided on the inner side of the sleeve away from the power part end, and the sealing assembly includes two spacer rings and a second sealing ring which are sleeved on the rear fixing sleeve, the second sealing ring is located between the two spacer rings, and the two spacer rings are respectively abutted against the end faces of the first spacer ring and the second mounting portion.

[0015] Optionally, the outer tool also includes an outer tool tube arranged at one end of the outer tool seat, and the inner tool includes an inner tool seat and an inner tool tube arranged at one end of the inner tool seat; the output end of the power member is provided with a rotating shaft, the rotating shaft is connected to the inner tool seat, the inner tool tube is arranged inside the outer tool tube, and can rotate inside the outer tool tube.

[0016] Optionally, the medical planer further comprises a transmission member, which is a cylindrical structure, one end of which is clamped with the inner knife seat, and the other end of which is fixedly connected with the rotating shaft.

[0017] Optionally, a second baffle ring is provided in the rear fixed sleeve, a rotating seal is provided between the power member and the second baffle ring, and the rotating seal is sleeved on the rotating shaft.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a medical planer. The medical planer is provided with a first sealing ring between an outer knife seat and a sleeve. This arrangement reduces the processing accuracy requirements for the outer knife seat and the sleeve when they are assembled, improves the processing efficiency, reduces the processing cost, and can prevent the liquid inside the sleeve from flowing out through the connection between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a schematic diagram of the structure of a medical planer in an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0022] Figure 3 for Figure 1 A partial enlarged view of point B in the middle;

[0023] Figure 4 Schematic diagram of the cooperation between the second structure of the bump and the notch.

[0024] In the figure:

[0025] 1. Shell; 11. Inner cavity; 12. Liquid joint; 13. Shell cover; 131. Inner cover; 132. Outer cover; 14. Second positioning pin;

[0026] 2. Knife handle; 21. Front fixing sleeve; 22. Sleeve; 23. Rear fixing sleeve;

[0027] 221, a convex block; 222, a first baffle ring; 223, a liquid outlet; 224, an annular boss;

[0028] 231, first mounting portion; 232, second mounting portion; 233, third mounting portion; 234, through hole; 235, second baffle ring;

[0029] 3. Cutting tools;

[0030] 31. external tool; 311. external tool holder; 312. external tool tube;

[0031] 3111, first shoulder; 3112, notch;

[0032] 32. inner tool; 321. inner tool holder; 322. inner tool tube;

[0033] 3211, first positioning pin;

[0034] 401, first sealing ring; 402, second sealing ring; 403, retaining ring; 404, third sealing ring;

[0035] 5. Motor; 51. Rotating shaft;

[0036] 6. Transmission part; 7. Spring; 8. Clamping slider; 9. Fixing pin. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] Figure 1 It is a schematic diagram of the structure of a medical planer in an embodiment of the present invention, Figure 2 for Figure 1 A partial enlarged view of the middle A. Figure 3 for Figure 1 The local enlarged view of point B in the figure is as follows: Figure 1-3As shown, this embodiment provides a medical planer, which includes a shell 1, a handle 2, a tool 3 and a power piece, wherein the handle 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 to the two ends of the sleeve 22; the shell 1 is sleeved on the outside of the sleeve 22 and the rear fixing sleeve 23; the tool 3 includes an outer tool 31 and an inner tool 32, wherein the outer tool 31 includes an outer tool seat 311, the outer tool seat 311 is penetrated into the sleeve 22, and a first shaft shoulder 3111 is provided on the outer periphery of the outer tool seat 311, and the first shaft shoulder 3111 is located between the front fixing sleeve 21 and the sleeve 22; a first sealing ring 401 is provided between the outer tool seat 311 and the sleeve 22; the output end of the power piece is connected to the inner tool 32; an end face of the power piece close to the output end is connected to one end of the rear fixing sleeve 23; the power piece can be but not limited to a motor 5.

[0042] The medical planer is provided with a first sealing ring 401 between the outer blade holder 311 and the sleeve 22. On the one hand, the outer blade holder 311 and the sleeve 22 are assembled without a conical surface design, which reduces the requirements for processing accuracy, thereby improving processing efficiency and reducing the manufacturing cost of the outer blade holder 311 and the sleeve 22; on the other hand, it can also prevent liquid from flowing out through the connection between the two. In addition, the provision of the first shaft shoulder 3111 facilitates the installation and positioning of the outer blade holder 311 when it is inserted into the sleeve 22, thereby improving the installation efficiency.

[0043] In order to limit the relative position between the outer knife seat 311 and the sleeve 22 in the circumferential direction, in this embodiment, optionally, the first shoulder 3111 is provided with a first positioning member, and the sleeve 22 is provided with a second positioning member, and the first positioning member can be plugged and matched with the second positioning member. This setting makes the circumferential position of the outer knife tube 312 connected to the outer knife seat 311 relatively fixed, and further makes the position of the window opened on the outer knife tube 312 fixed relative to the sleeve 22, which is conducive to maintaining the doctor's habit of using tools during surgery and improving the doctor's comfort during surgery.

[0044] Optionally, the first positioning member is a notch 3112 provided on the first shaft shoulder 3111, and the second positioning member is a bump 221 provided on the sleeve 22, and the bump 221 can cooperate with the notch 3112. This arrangement makes the structure of the outer tool 31 simple, and is easy to design and manufacture.

[0045] Figure 4 FIG. 1 is a schematic diagram of the cooperation between the second structure of the protrusion and the notch. Figure 4, further, the outer diameter of the bump 221 gradually decreases in the direction close to the outer cutter head, and is conical. This arrangement makes it easy for the bump 221 to cooperate with the notch 3112, which is beneficial to improving the positioning speed of the outer tool 31 and the sleeve 22. Furthermore, the outer diameter of the notch 3112 gradually expands in the direction away from the outer cutter head. While improving the positioning speed of the outer tool 31 and the sleeve 22, the cooperation between the notch 3112 and the bump 221 can also effectively prevent the outer tool 31 and the sleeve 22 from axial rotation. In other embodiments, the bump 221 can also be of other shapes, as long as it can ensure that the outer diameter of the bump 221 away from the sleeve 22 end is smaller than the outer diameter of the notch 3112. For example, the shape of the bump 221 can also be a wedge-shaped structure.

[0046] In addition, since the outer diameter of the first shoulder 3111 is greater than the inner diameter of the sleeve 22, the arrangement enables the first shoulder 3111 to limit the depth of the outer tool holder 311 extending into the sleeve 22, and a notch 3112 is provided on the circumferential side of the first shoulder 3111 to limit the circumferential position of the outer tool holder 311 relative to the sleeve 22; secondly, providing the notch 3112 on the first shoulder 3111 is conducive to simplifying the design and manufacturing process of the outer tool holder 311, and also facilitates simplifying the design and manufacturing process of the sleeve 22.

[0047] Optionally, the front fixing sleeve 21 is provided with an annular flange, and the annular flange is used to press the first shaft shoulder 3111 against one end of the sleeve 22. The front fixing sleeve 21 and the sleeve 22 are connected by threads, and the inner diameter of the front fixing sleeve 21 is adapted to the outer diameter of the sleeve 22. This arrangement improves the efficiency of installing the outer knife holder 311 on the sleeve 22 and shortens the preparation time for surgery.

[0048] Optionally, the outer tool holder 311 is provided with a first annular groove, and the first sealing ring 401 is provided in the first annular groove. The first sealing ring 401 is preferably an O-ring. The provision of the first annular groove can increase the installation speed of the first sealing ring 401.

[0049] Optionally in this embodiment, the rear fixing sleeve 23 is provided with a through hole 234 around the center line direction, a threaded hole is provided at one end of the power part, the locking bolt is passed through the through hole 234 and is threadedly connected to the power part; the outer periphery of the rear fixing sleeve 23 is provided with a thread, the inner side of the sleeve 22 is provided with a thread, and the rear fixing sleeve 23 is threadedly connected to the sleeve 22.

[0050] In this embodiment, specifically, the rear fixing sleeve 23 is stepped, and includes a first mounting portion 231 and a second mounting portion 232; the outer diameter of the first mounting portion 231 is greater than the outer diameter 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 penetrated through the sleeve 22 and is threadedly connected to the inner wall of the sleeve 22. This arrangement makes full use of the internal space of the sleeve 22, and does not expand the overall outer diameter after being connected to the rear fixing sleeve 23. In addition, it is not necessary to process the stepped surface on the outer side of the sleeve 22 and then process the threads, thereby improving the processing efficiency.

[0051] In other embodiments, the position of the through hole 234 may be, but is not limited to, the first mounting portion 231, and the motor 5 with different outer diameters can be adapted when the outer diameter of the rear fixing sleeve 23 remains unchanged, wherein when the outer diameter of the motor 5 is large, the through hole 234 may be arranged on the first mounting portion 231, and when the outer diameter of the motor 5 is small, the through hole 234 may be arranged between the first mounting portion 231 and the second mounting portion 232, at which time, the thread of the second mounting portion 232 will be interrupted by the through hole 234, but the connection with the sleeve 22 will not be affected, and this arrangement improves the selectivity of the medical planer for different motors 5. Optionally, the number of the through holes 234 may be, but is not limited to, three.

[0052] Of course, in other embodiments, the rear fixing sleeve 23 and the sleeve 22 can be connected by the fixing pin 9. Specifically, the rear fixing sleeve 23 is provided with a first pin hole, and the sleeve 22 is provided with a second pin hole, wherein the first pin hole is a blind hole, and the second pin hole is a through hole, and the fixing pin 9 passes through the second pin hole and then matches with the first pin hole. Since the rear fixing sleeve 23 and the sleeve 22 are pin-connected, the outer shell 1 will be sleeved on the outside of the sleeve 22, and the pin connection here does not need to be fixed, the processing time of the pin hole is short, the manufacturing efficiency is improved, and the installation efficiency is improved.

[0053] Furthermore, the rear fixing sleeve 23 further includes a third mounting portion 233 adjacent to the second mounting portion 232, the outer diameter of the third mounting portion 233 is smaller than the outer diameter of the second mounting portion 232, and a sealing assembly is provided between the third mounting portion 233 and the inner side surface of the sleeve 22. This arrangement further utilizes the internal space of the sleeve 22, which is conducive to improving the space utilization rate of the sleeve 22, and there is no need to process a step on the sleeve 22, thereby ensuring the strength of the sleeve 22.

[0054] Furthermore, a first baffle ring 222 is provided on the inner side of the sleeve 22 away from the end of the power part, and the sealing assembly includes two baffle rings 403 and a second sealing ring 402 sleeved on the rear fixing sleeve 23, and the second sealing ring 402 is located between the two baffle rings 403, and the two baffle rings 403 are respectively in contact with the end faces of the first baffle ring 222 and the second mounting portion 232. Optionally, the baffle ring 403 is a rectangular rubber ring, that is, the cross section of the baffle ring 403 is rectangular, and the second sealing ring 402 can be an O-ring. On the one hand, this setting is sealed through a triple sealing structure, and the sealing effect is good. On the other hand, the two baffle rings 403 block the second sealing ring 402, which can prevent it from shifting and improve the sealing effect.

[0055] Optionally, the outer tool 31 also includes an outer tool tube 312 disposed at one end of the outer tool seat 311, and the inner tool 32 includes an inner tool seat 321 and an inner tool tube 322 disposed at one end of the inner tool seat 321; a rotating shaft 51 is provided at the output end of the power member, the rotating shaft 51 is connected to the inner tool seat 321, and the inner tool tube 322 is disposed inside the outer tool tube 312 and can rotate inside the outer tool tube 312. Further, the medical planer also includes a transmission member 6, which is a cylindrical structure, one end of the transmission member 6 is engaged with the inner tool seat 321, and the other end of the transmission member 6 is fixedly connected to the rotating shaft 51. A clamping groove is circumferentially provided at one end of the transmission member 6, and a clamping convex is axially provided at one end of the inner tool seat 321 away from the inner tool tube 322, and the clamping groove is engaged with the clamping convex. This arrangement makes the connection between the inner tool seat 321 and the transmission member 6 more convenient, thereby improving the installation efficiency.

[0056] Optionally, the rotating shaft 51 and the transmission member 6 are connected by a locking screw. Specifically, the side wall of the transmission member 6 is provided with a threaded hole penetrating the side wall, and the locking screw is threadedly connected to the side wall of the threaded hole and can press against the rotating shaft 51. In other embodiments, the rotating shaft 51 and the transmission member 6 can be connected by bonding or pinning.

[0057] Optionally, a first positioning pin 3211 is provided at one end of the inner knife seat 321 away from the inner knife tube 322. The first positioning pin 3211 can be inserted into the transmission member 6, and a spring 7 is provided between the first positioning pin 3211 and the end surface of the rotating shaft 51. This arrangement is conducive to the inner knife tube 322 always being subjected to the pressure transmitted by the spring 7, so that the inner knife 32 and the outer knife 31 are in a pressed state, preferably, the inner knife head and the outer knife head are pressed. In other embodiments, the first positioning pin 3211 can be replaced by a key.

[0058] Furthermore, a clamping slider 8 is provided between the first positioning pin 3211 and the spring 7. The clamping slider 8 is a cylinder, and its diameter is larger than the outer diameter of the spring 7 and the first positioning pin 3211, and a flange is provided at one end of the transmission member 6, and the inner diameter of the flange is equal to the outer diameter of the first positioning pin 3211, and the diameter of the internal cavity of the transmission member 6 is equal to the outer diameter of the clamping slider 8 and the spring 7. This arrangement prevents the spring 7 from falling out of the flange side of the transmission member 6 during assembly, thereby improving installation efficiency and preventing the spring 7 from damaging the planer after falling out.

[0059] Furthermore, a plurality of clamping slide blocks 8 may be provided, and the pressure of the spring 7 on the inner cutter 32 may be adjusted by providing different numbers of clamping slide blocks 8 .

[0060] Optionally, one end face of the first baffle ring 222 close to the rear fixed sleeve 23 is perpendicular to the center line of the sleeve 22, and this arrangement is conducive to limiting the position of the baffle ring 403; one end face of the first baffle ring 222 away from the rear fixed sleeve 23 is a conical surface, which forms a funnel shape. The conical surface makes the inner diameter of the cavity in this part of the sleeve 22 gradually expand along the direction of the liquid outlet 223 close to the sleeve 22, so that the liquid on the transmission member 6 will be thrown onto the conical surface during the rotation and move toward the liquid outlet 223, which can effectively prevent the liquid from flowing along the transmission member 6 toward the motor 5. Furthermore, the side wall of the cavity of the sleeve 22 between the liquid outlet 223 and the first baffle ring 222 can also be set to a conical surface, forming a funnel shape, so that the inner diameter of the cavity in this part of the sleeve 22 gradually expands 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 of the inner tool 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 outer shell 1.

[0061] Optionally, a second baffle ring 235 is provided in the rear fixing sleeve 23, a rotary seal is provided between the power member and the second baffle ring 235, and the rotary seal is sleeved on the rotating shaft 51. This arrangement can prevent liquid from entering the motor 5 along the rotating shaft 51, which helps to extend the service life of the motor 5.

[0062] Optionally, the outer shell 1 and the sleeve 22 are fitted with an interference fit, and an annular boss 224 is circumferentially provided on the outer side of one end of the sleeve 22, and the annular boss 224 is used to limit the outer shell 1; further, the sleeve 22 is provided with a positioning hole near the end of the annular boss 224, and the outer shell 1 is provided with a positioning port, and the second positioning pin 14 is passed through the positioning hole, and the positioning port cooperates with the second positioning pin 14 to prevent circumferential misalignment during the outer installation process, thereby aligning the liquid outlet 223 with the entrance of the inner cavity 11.

[0063] Optionally, a second annular groove and a third annular groove are provided on both 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.

[0064] Optionally, the liquid connector 12 connects the external pipeline with the inner cavity 11, and the liquid in the surgical process is discharged under the action of the negative pressure device. The shell cover 13 is used to enclose the motor 5 in the shell 1. Further, the shell cover 13 includes an inner cover 131 and an outer cover 132, the inner cover 131 is wrapped with a first cable with both ends extending out of the inner cover 131, one end of the first cable is used to connect with the second cable of the motor 5, and the other end of the first cable is connected to an external power supply; the circumferential surface of the inner cover 131 is stepped, and one end of the outer cover 132 is provided with a flange, the outer cover 132 is sleeved on the outside of the inner cover 131, and the flange of the outer cover 132 can cooperate with the step surface of the inner cover 131 to press the inner cover 131 against the shell 1, and the outer cover 132 is screwed to the shell 1. This setting prevents the second cable from rotating around its own axis and causing winding during the process of enclosing the motor 5, thereby improving the durability of the second cable. Furthermore, the inner cover 131 can be plugged into the outer shell 1. Specifically, a protrusion is provided on the outer periphery of the inner cover 131, and a slide groove is provided on the inner side of the outer shell 1. The protrusion can slide in the slide groove. This arrangement ensures that the inner cover 131 will not rotate during the tightening process of the outer cover 132, further ensuring that the second cable will not rotate around its own axis.

[0065] Obviously, the above 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. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A medical planer, characterized in that: include: A knife handle (2), the knife handle (2) comprising a sleeve (22) and a rear fixing sleeve (23), the rear fixing sleeve (23) being fixed to one end of the sleeve (22); A tool (3), the tool (3) comprising an outer tool (31) and an inner tool (32), wherein the outer tool (31) comprises an outer tool holder (311), and the outer tool holder (311) is arranged inside the sleeve (22); a first sealing ring (401) is arranged between the outer tool holder (311) and the sleeve (22); A power piece, wherein the output end of the power piece is connected to the inner cutter (32); an end surface of the power piece close to the output end is connected to one end of the rear fixing sleeve (23); The tool handle (2) further comprises a front fixing sleeve (21), wherein the front fixing sleeve (21) is fixed to the other end of the sleeve (22), and the outer periphery of the outer tool holder (311) is provided with a first shaft shoulder (3111), wherein the first shaft shoulder (3111) is located between the front fixing sleeve (21) and the sleeve (22); The first shaft shoulder (3111) is provided with a first positioning piece, the sleeve (22) is provided with a second positioning piece, and the first positioning piece can be plugged and matched with the second positioning piece; The rear fixing sleeve (23) is provided with a through hole (234) around the center line direction, and one end of the power member is provided with a threaded hole, and a locking bolt can pass through the through hole (234) and be threadedly connected with the power member; the outer periphery of the rear fixing sleeve (23) is provided with a thread, and the inner side of the sleeve (22) is provided with a thread, and the rear fixing sleeve (23) is threadedly connected with the sleeve (22); The outer tool (31) further comprises an outer tool tube (312) arranged at one end of the outer tool seat (311); the inner tool (32) comprises an inner tool seat (321) and an inner tool tube (322) arranged at one end of the inner tool seat (321); a rotating shaft (51) is provided at the output end of the power member, the rotating shaft (51) is connected to the inner tool seat (321), and the inner tool tube (322) is arranged inside the outer tool tube (312) and can rotate inside the outer tool tube (312).

2. The medical planer according to claim 1, characterized in that: The rear fixing sleeve (23) is in a step shape, and comprises a first mounting portion (231) and a second mounting portion (232); the outer diameter of the first mounting portion (231) is greater than the outer diameter 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 inserted into the sleeve (22) and is screwed to the inner wall of the sleeve (22).

3. The medical planer according to claim 2, characterized in that: The rear fixing sleeve (23) further comprises a third mounting portion (233) adjacent to the second mounting portion (232), the outer diameter of the third mounting portion (233) being smaller than the outer diameter of the second mounting portion (232), and a sealing assembly being provided between the third mounting portion (233) and the inner side surface of the sleeve (22).

4. The medical planer according to claim 3, characterized in that: A first spacer ring (222) is provided on the inner side of the sleeve (22) away from the end of the power part, and the sealing assembly comprises two spacer rings (403) and a second sealing ring (402) which are sleeved on the rear fixing sleeve (23), and the second sealing ring (402) is located between the two spacer rings (403), and the two spacer rings (403) are respectively in contact with the end faces of the first spacer ring (222) and the second mounting portion (232).

5. The medical planer according to claim 1, characterized in that: The medical planer also includes a transmission member (6), which is a cylindrical structure. One end of the transmission member (6) is clamped with the inner knife seat (321), and the other end of the transmission member (6) is fixedly connected to the rotating shaft (51).

6. The medical planer according to claim 1, characterized in that: A second baffle ring (235) is provided in the rear fixed sleeve (23), a rotary seal is provided between the power member and the second baffle ring (235), and the rotary seal is sleeved on the rotating shaft (51).

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