Motor assembly, planing handle, and surgical power device

Abstract

The present application relates to the technical field of minimally invasive surgical devices, and provides a motor assembly, a planing handle, and a surgical power device. The motor assembly comprises a motor (1), an output tube (5), and a sealing ring (4); the motor (1) comprises a housing assembly (3) and a rotor rotatably provided in the housing assembly (3); the rotor is internally provided with an inner tube (2) coaxial with the rotor and rotating along with the rotor; the rear end of the inner tube (2) passes through the housing assembly (3), and a rotation gap (6) is formed between the outer wall of the rear end of the inner tube (2) and the housing assembly (3) in the radial direction of the rotor; the front end of the output tube (5) is connected to the housing assembly (3) and is in direct communication with the rear end of the inner tube (2), and a connection gap (7) is formed between the inner tube (2) and the output tube (5); the sealing ring (4) passes through the inner tube (2) and simultaneously blocks the rotation gap (6) and the connection gap (7).

Description

Motor assembly, planer handle and surgical power unit

[0001] Related applications

[0002] This application claims priority to Chinese patent application filed on September 2, 2024, application number 2024112215120, entitled "Motor Assembly and Planing Handle", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of minimally invasive surgical equipment technology, and in particular to a motor assembly and a surgical power device for a planer handle. Background Technology

[0004] The planer handle and the appropriate planer tool are assembled into a surgical power unit capable of planing and removing tissue.

[0005] In existing planing handles, the suction channel is located next to the axis of the motor used to drive the cutting tool, and the axis of the suction channel or the motor is coaxial with the planer tool mounting channel. If the planer tool mounting channel in the handle is coaxial with the motor, the suction channel is offset from the planer tool mounting channel. If the suction channel in the handle is coaxial with the planer tool mounting channel, the axis of the motor is offset relative to the planer tool mounting channel. These two types of planing handles may result in a larger handle size and a more complex structure.

[0006] If a motor with an integrated hollow channel is used, the internal channel of the motor can be used as a suction channel to reduce the size of the handle. However, when using this method, the motor is rotating, so the problem of how to discharge the fluid and tissue in the internal channel of the motor to the handle without leakage must be solved. Summary of the Invention

[0007] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a motor assembly, a planing handle, and a surgical power device.

[0008] To achieve the above and other related objectives, this application provides a motor assembly, comprising:

[0009] An electric motor, the electric motor including a housing assembly and an inner tube rotatably disposed within the housing assembly, the rear end of the inner tube extending out of the housing assembly, and a rotational clearance between the outer wall of the rear end of the inner tube and the housing assembly;

[0010] An output tube, the front end of which is connected to the housing assembly and is inserted into and communicates with the rear end of the inner tube, and there is a connection gap between the inner tube and the output tube;

[0011] A sealing ring is inserted through the inner tube and simultaneously seals the rotation gap and the connection gap.

[0012] Optionally, the front end of the output tube has a plug-in section, the rear end of the inner tube is inserted into the plug-in section and rotates within the plug-in section, and the connection gap includes the gap between the outer wall of the inner tube and the inner wall of the plug-in section.

[0013] A mounting hole is provided on the end face of the shell assembly near the output tube along the axis of the rotor. The rear end of the inner tube passes through the mounting hole, and at least part of the front end of the output tube is disposed in the mounting hole. The inner wall of the insertion section, the hole wall of the mounting hole, and the outer wall of the inner tube form a sealing cavity. The sealing cavity communicates with the rotation gap and the connection gap, respectively. The sealing ring is disposed in the sealing cavity, and the sealing ring makes sealing contact with the insertion section, the hole wall of the mounting hole, and the outer wall of the inner tube, respectively.

[0014] Optionally, the inner wall of the mounting hole is provided with an internal thread, and the outer wall of the front end of the output tube is provided with an external thread, and the front end of the output tube is threadedly connected to the mounting hole.

[0015] Optionally, the sealing cavity includes a main sealing cavity and a secondary sealing cavity arranged radially from the inside to the outside. The sealing ring includes a first sealing part and a second sealing part. The second sealing part is located in the secondary sealing cavity and pressed between the bottom of the mounting hole and the end face of the insertion section. The first sealing part is disposed in the main sealing cavity. The first sealing part is radially disposed between the second sealing part and the outer wall of the inner tube, and the first sealing part is in sealing contact with the outer wall of the inner tube.

[0016] Optionally, the first sealing part has a first sealing lip and a second sealing lip. The first sealing lip is in sealing contact with the outer wall of the inner tube, and the second sealing lip is in sealing contact with the inner wall of the insertion section. Both the first sealing lip and the second sealing lip extend circumferentially along the sealing ring, and the first sealing lip and the second sealing lip are respectively arranged around the rotation axis of the sealing ring.

[0017] Optionally, an annular groove with an opening facing the connection gap is formed between the first sealing lip and the second sealing lip.

[0018] Optionally, an elastic support member is provided inside the annular groove.

[0019] Optionally, the elastic support includes a metal spring covered with a protective layer.

[0020] Optionally, the shell assembly includes a shell body and a detachable fastener for mounting the rear end of the shell body, the mounting hole being formed on the fastener.

[0021] Optionally, the fastener includes a connecting sleeve and a mounting sleeve arranged sequentially from front to back. The mounting sleeve is connected to the shell body through the connecting sleeve. An inner boss protrudes from the connecting sleeve and the mounting sleeve toward the inner tube at the connection position. The inner boss continuously surrounds the inner tube for one circumference, and the inner boss and the inner wall of the mounting sleeve together form the mounting hole.

[0022] Optionally, the inner boss is provided with a through hole for the inner tube to pass through.

[0023] Optionally, the output tube and the inner tube are coaxially arranged, and the output tube further includes a main body section disposed at the rear end of the plug section, wherein the inner diameter of the main body section is greater than or equal to the inner diameter of the inner tube.

[0024] Optionally, the insertion section is provided with a rotating hole for inserting the rear end of the inner tube, the inner diameter of the rotating hole being larger than the inner diameter of the body section.

[0025] Optionally, the motor further includes a matching stator and rotor disposed within the housing assembly, the stator being fixed within the housing assembly, the rotor being rotatably disposed within the housing assembly, and the inner tube being coaxially disposed within the rotor and capable of rotating with the rotor.

[0026] Optionally, the output tube is provided with anti-detachment barbs at its rear end.

[0027] This application also provides a planing handle, including a handle housing and a motor assembly as described in any of the preceding claims, wherein the housing has a mounting cavity, the motor assembly is fixedly disposed in the mounting cavity, and the rear end of the output tube extends out of the handle housing.

[0028] Optionally, the handle housing includes a handle housing, a rear cover, and a threaded sleeve. The mounting cavity is formed inside the handle housing, and the motor assembly is fixedly installed inside the mounting cavity. The rear cover covers the rear end of the handle housing and has an opening for the output tube to pass through. The threaded sleeve is threaded onto the output tube and is located behind the rear cover, abutting against the rear end of the rear cover.

[0029] Optionally, the outer contour of the output tube includes a limiting step facing away from the motor assembly, and the rear cover is disposed between the limiting step and the threaded sleeve, wherein the limiting step is used to limit the rear cover.

[0030] This application also provides a surgical power device, including the above-described planing handle and a cutting tool assembly adapted to the planing handle.

[0031] Optionally, the tool assembly includes an outer tool tube and an inner tool tube passing through the outer tool tube. The front end of the inner tool tube is provided with a cutting edge, and the rear end of the tool tube is connected to and communicates with the inner tube. The inner tube can drive the inner tool tube to rotate. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0033] Figure 1 shows a partial cross-sectional view of the connection between the output tube and the motor in an embodiment of this application.

[0034] Figure 2 shows a partially enlarged cross-sectional view of the shell assembly and output tube in an embodiment of this application;

[0035] Figure 3 shows a cross-sectional view of the sealing cavity in an embodiment of this application;

[0036] Figure 4 shows a cross-sectional view of the connecting sleeve and the mounting sleeve in an embodiment of this application;

[0037] Figure 5 shows a cross-sectional view of the output tube in an embodiment of this application;

[0038] Figure 6 shows a partially enlarged structural diagram of the sealing ring in Figure 1;

[0039] Figure 7 shows a partially enlarged structural diagram of the sealing cavity in Figure 3;

[0040] Figure 8 shows a partially enlarged structural schematic diagram of the sealing ring cross-section in an embodiment of this application;

[0041] Figure 9 shows a schematic diagram of the surgical power device in an embodiment of this application.

[0042] Explanation of reference numerals in the attached drawings: Motor 1, Inner tube 2, Shell assembly 3, Sealing ring 4, Output tube 5, Rotation clearance 6, Connection clearance 7, Sealing cavity 8, Outer blade tube 9, Tool assembly 10, Inner blade tube 11, Connecting sleeve 30, Mounting sleeve 31, Inner boss 32, Rear cover 33, Screw sleeve 34, Mounting hole 35, Annular structure groove 40, First sealing lip 41, Second sealing lip 42, First sealing part 43, Second sealing part 44, Elastic support 45, Rotation hole 50, Anti-loosening barb 51, Limiting step 52, Main sealing cavity 81, Secondary sealing cavity 82. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application.

[0045] It should be noted that the illustrations provided in one embodiment are merely schematic representations of the basic concept of this application. Therefore, the drawings only show components relevant to this application and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, and sizes shown in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this application, should still fall within the scope of the technical content disclosed in this application. Meanwhile, in this specification, the directional term "front" refers to the position of the instrument or component away from the operator, and the directional term "rear" refers to the position of the instrument or component closer to the operator. These terms are used only for clarity of description and are not intended to limit the scope of this application. Any changes or adjustments to these relative relationships, without substantially altering the technical content, shall also be considered as part of the scope of this application.

[0046] Please refer to Figures 1 to 9. One embodiment of this application provides a motor assembly, including a motor 1, an output pipe 5, and a sealing ring 4. The motor 1 includes an inner tube 2 rotatably disposed within a housing assembly 3. In actual implementation, the motor 1 typically includes a matching stator and rotor disposed within the housing assembly 3. The stator is fixed within the housing assembly 3, and the rotor is rotatably disposed within the housing assembly 3. The inner tube 2 is coaxially disposed within the rotor and can rotate with the rotor; this motor 1 can be a micro motor.

[0047] As shown in Figures 1-4, in one embodiment, the rear end of the inner tube 2 protrudes through the shell assembly 3, thus exposing the rear end of the inner tube 2 outside the shell assembly 3. The front end of the output tube 5 is connected to the shell assembly 3 and is inserted into and communicates with the rear end of the inner tube 2. Referring to Figure 7, there is a connection gap 7 between the inner tube 2 and the output tube 5, and a rotation gap 6 between the outer wall of the rear end of the inner tube 2 and the shell assembly 3 in the radial direction of the rotor, allowing the inner tube 2 to rotate flexibly relative to the shell assembly 3 and the output tube 5, avoiding interference. The insertion and communication between the front end of the output tube 5 and the rear end of the inner tube 2 allows liquids and tissues to directly enter the output tube 5 from the inner tube 2, which helps reduce the possibility of blockage inside the tube, and the transport of tissues does not require any components outside the inner tube 2 and the output tube 5, resulting in a simple structure. The sealing ring 4 is inserted into the inner tube 2, simultaneously sealing the rotation gap 6 and the connection gap 7, preventing liquids and tissues flowing from the inner tube 2 to the output tube 5 from flowing out through the connection gap, and also preventing liquids outside the motor 1 from flowing into the motor 1 through the rotation gap 6, thus preventing damage to the motor 1.

[0048] Specifically, as shown in Figures 1 to 5, in one embodiment, the front end of the output tube 5 has a plug-in section, and the rear end of the inner tube 2 is inserted into the plug-in section and can rotate within it. That is, the front end of the output tube 5 has a portion for inserting the inner tube 2. In one embodiment, the inner cavity of the plug-in section is a rotating hole 50 for inserting the rear end of the inner tube 2. The inner diameter of the rotating hole 50 is larger than the inner diameter of the output tube 5 at the rear of the plug-in section, so that the rotating hole 50 has sufficient size to allow the inner tube 2 to rotate within it. In one embodiment, the connection gap 7 includes the gap between the outer wall of the inner tube 2 and the inner wall of the plug-in section. After the inner tube 2 is inserted into the plug-in section, it can also rotate flexibly within the plug-in section, avoiding interference with the inner wall of the plug-in section.

[0049] Meanwhile, referring to Figure 4, a mounting hole 35 is provided on the end face of the shell assembly 3 near the output pipe 5 along the axis of the rotor. The rear end of the inner pipe 2 passes through the mounting hole 35. Referring to Figure 3, at least part of the front end of the output pipe 5 is provided in the mounting hole 35. The inner wall of the insertion section, the hole wall of the mounting hole 35, and the outer wall of the inner pipe 2 form a sealing cavity 8. The sealing cavity 8 communicates with the rotation gap 6 and the connection gap 7, respectively. Referring to Figure 2, the sealing ring 4 is provided in the sealing cavity 8, and the sealing ring 4 makes sealing contact with the inner wall of the insertion section, the hole wall of the mounting hole 35, and the outer wall of the inner pipe 2, thereby sealing the connection gap 7 and the sealing gap.

[0050] As shown in Figure 7, in one embodiment, the sealing cavity 8 includes a main sealing cavity 81 and a secondary sealing cavity 82, which are arranged radially from the inside to the outside. As shown in Figures 6 and 8, the sealing ring 4 includes a first sealing part 43 and a second sealing part 44. The second sealing part 44 is located in the secondary sealing cavity 82 and is pressed between the bottom of the mounting hole 35 and the end face of the insertion section. The first sealing part 43 is disposed in the main sealing cavity 81 and is radially disposed between the second sealing part 44 and the outer wall of the inner tube 2, and the first sealing part 43 is in sealing contact with the outer wall of the inner tube 2. In one embodiment, the first sealing part 43 and the second sealing part 44 are connected as one piece, and there are no holes or gaps between the first sealing part 43 and the second sealing part 44 to prevent liquid from passing through between the first sealing part 43 and the second sealing part 44. The first sealing part 43 is in sealing contact with the outer wall of the inner tube 2, blocking liquids, tissues, and other substances waiting to be discharged outside the sealing ring 4, and preventing liquid from entering the motor 1 along the outer wall of the inner tube 2. The second sealing part 44 is located within the secondary sealing cavity 82 and is pressed between the bottom of the mounting hole 35 and the end face of the insertion section. That is, the second sealing part 44 makes sealing contact with both the bottom of the mounting hole 35 and the end face of the insertion section. The second sealing part 44 acts as a barrier between the bottom of the mounting hole 35 and the end face of the insertion section, preventing liquids, tissues, and other substances outside the sealing ring 4 from flowing through the second sealing part 44 and entering the motor 1. The first sealing part 43 and the second sealing part 44 provide multiple seals, resulting in a good sealing effect. The pressure of the second sealing part 44 between the bottom of the mounting hole 35 and the end face of the insertion section limits the movement of the sealing ring 4, reducing its displacement during the rotation of the inner tube 2 and helping to maintain the sealing effect of the sealing ring 4.

[0051] In one embodiment, the inner wall of the mounting hole 35 is provided with an internal thread, and the outer wall of the front end of the output pipe 5 is provided with an external thread. The front end of the output pipe 5 is threadedly connected to the mounting hole 35. The threaded pair between the output pipe 5 and the mounting hole 35 is provided along the extension direction of the inner pipe 2. The relative position between the output pipe 5 and the mounting hole 35 can be adjusted by the threaded pair, thereby adjusting the pressing effect of the bottom of the mounting hole 35 and the end face of the insertion section on the second sealing part 44.

[0052] Specifically, as shown in Figure 8, in one embodiment, the first sealing portion 43 has a first sealing lip 41 and a second sealing lip 42. The first sealing lip 41 and the second sealing lip 42 extend circumferentially along the sealing ring 4 to form annular sealing lips. The first sealing lip 41 makes sealing contact with the outer wall of the inner tube 2, and the second sealing lip 42 makes sealing contact with the inner wall of the insertion section. The sealing lips are relatively soft and make good contact with the part to be sealed, which helps to increase the sealing effect of the first sealing portion 43. The first sealing lip 41 and the second sealing lip 42 are both arranged around the rotation axis of the sealing ring 4 to completely seal the gap between the sealing ring 4 and the inner wall of the insertion section.

[0053] Referring again to Figure 8, specifically, in one embodiment, an annular groove 40 with an opening facing the connection gap 7 is formed between the first sealing lip 41 and the second sealing lip 42 of the first sealing part 43. On the one hand, if the structural strength of the first sealing part 43 is too high and the deformation is insufficient, the fit between it and the part to be sealed will be poor, affecting the sealing effect. If the structural strength of the first sealing part 43 is too low and the radial support force is insufficient, it will also affect the fit between the first sealing part 43 and the part to be sealed. The annular groove 40 can reduce the structural strength of the first sealing part 43. By adjusting the size and position of the annular groove 40, the structural strength of the first sealing part 43 can be adjusted to ensure the deformation of the first sealing part 43, thereby ensuring the sealing effect of the first sealing part 43. On the other hand, if tissue fluid or waste fluid enters the sealing cavity 8 at the connection gap 7 between the inner tube 2 and the output tube 5, because the opening of the annular groove 40 faces the connection gap 7, the tissue fluid or waste fluid can enter the annular groove through the opening, reducing the accumulation of these liquids on the outer wall of the inner tube 2, resulting in a better sealing effect.

[0054] Optionally, an elastic support 45 is provided within the annular groove 40. The elastic support 45 provides additional radial support to ensure the fit between the first sealing part 43 and the part to be sealed. The elastic support 45 can be a metal spring, or a protective layer such as silicone can be wrapped around the metal spring to improve the service life of the metal spring and the sealing ring 4.

[0055] As shown in Figures 1 to 4, in one embodiment, the shell assembly 3 includes a shell body and a detachable mounting member for the rear end of the shell body, with a mounting hole 35 formed on the mounting member. In some embodiments, the mounting member is integrally formed, and the mounting hole 35 is directly formed on the mounting member. Specifically, referring to Figure 4, in one embodiment, the mounting member includes a connecting sleeve 30 and a mounting sleeve 31 arranged sequentially from front to back. The mounting sleeve 31 is connected to the shell body through the connecting sleeve 30. An inner boss 32 protrudes from the connecting sleeve 30 and the mounting sleeve 31 toward the inner tube 2 at the connection position. The inner boss 32 surrounds the inner tube 2 in a continuous circumference, and the wall surface of the inner boss 32 and the inner wall of the mounting sleeve 31 together form the mounting hole 35. During the formation of the inner boss 32, a through hole is left for the inner tube 2 to pass through. The gap between the top surface of the inner boss 32 and the outer wall of the inner tube 2 is the rotation gap 6.

[0056] In one embodiment, the output pipe 5 and the inner pipe 2 are coaxially arranged. The output pipe 5 also includes a main body section disposed at the rear end of the insertion section. The main body section is located after the insertion section, and its inner diameter is greater than or equal to the inner diameter of the inner pipe 2. When the liquid or tissue in the inner pipe 2 is discharged from the inner pipe 2, it flows into the internal cavity of the main body section. The fact that the inner diameter of the main body section is greater than or equal to the inner diameter of the inner pipe 2 facilitates the flow of liquid or tissue, reduces obstruction to the liquid or tissue, and lowers the probability of blockage of the output pipe 5.

[0057] As shown in Figure 5, in one embodiment, an anti-detachment barb 51 is provided on the rear end of the main body section, that is, the rear end of the output pipe 5. The rear end of the output pipe 5 is used to connect with an external pipeline, which is usually a flexible hose. The anti-detachment barb 51 can increase the connection effect between the output pipe 5 and the flexible hose and reduce the probability of the flexible hose accidentally falling off.

[0058] As shown in Figures 1 to 9, this embodiment also provides a planing handle, including a handle housing and a motor assembly as described in any of the preceding embodiments. The housing has a mounting cavity, and the motor assembly is fixedly disposed within the mounting cavity. The rear end of the output pipe 5 extends out of the handle housing. The handle housing is used by the operator for gripping and also serves to protect and secure the motor assembly.

[0059] Referring to Figure 2, specifically, the handle housing includes a handle shell, a rear cover 33, and a threaded sleeve 34. A mounting cavity is formed within the handle shell, and the motor assembly is fixedly installed within the mounting cavity. The rear cover 33 covers the rear end of the handle shell and has an opening for the output tube 5 to pass through. The rear cover 33 is removable for easy installation and removal of the motor assembly. The threaded sleeve 34 is threaded onto the output tube 5, located behind the rear cover 33 and abutting against its rear end. The threaded sleeve 34 limits the rear cover 33's position, preventing accidental detachment.

[0060] Referring to Figure 5, specifically, in one embodiment, the outer contour of the output tube 5 includes a limiting step 52 facing away from the motor assembly, and a rear cover 33 is disposed between the limiting step 52 and the screw sleeve 34. The limiting step 52 limits the rear cover 33 and cooperates with the screw sleeve 34 to fix the rear cover 33.

[0061] As shown in Figure 9, one embodiment of this application also provides a surgical power device, including the handle as described above and a blade assembly 10 adapted to the handle. The blade assembly 10 typically includes an outer blade tube 9 and an inner blade tube 11 sleeved inside the outer blade tube 9. The front end of the inner blade tube 11 is provided with a cutting edge for cutting lesion tissue, etc. The rear end of the inner blade tube 11 is driven and communicated with the inner tube 2. The inner tube 2 drives the inner blade tube 11 to rotate, providing cutting power to the inner blade tube 11. At the same time, liquids and tissues aspirated from the inner blade tube 11 can be discharged into the inner tube 2, and discharged into the output tube 5 through the inner conduit, and discharged outside the motor 1 through the output tube 5.

[0062] In summary, the motor assembly, planing handle, and surgical power device provided in one embodiment of this application, due to the presence of an output pipe 5, with its front end connected to the housing assembly 3 and directly communicating with the rear end of the inner tube 2, allows liquids and tissues in the inner tube 2 to flow into and out of the output pipe 5. Simultaneously, because of the connection gap 7 between the inner tube 2 and the output pipe 5, the inner tube 2 can rotate relative to the output pipe 5 to output power. The sealing ring 4 seals the rotation gap 6 and the connection gap 7, preventing liquids and tissues in the inner tube 2 from leaking from the connection between the inner tube 2 and the output pipe 5 and entering the motor 1, thus ensuring product reliability.

[0063] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

A motor assembly, characterized in that, include: An electric motor, the electric motor including a housing assembly and an inner tube rotatably disposed within the housing assembly, the rear end of the inner tube extending out of the housing assembly, and a rotational clearance between the outer wall of the rear end of the inner tube and the housing assembly; An output tube, the front end of which is connected to the housing assembly and inserted into and communicates with the rear end of the inner tube, and there is a connection gap between the inner tube and the output tube; A sealing ring is inserted through the inner tube and simultaneously seals the rotation gap and the connection gap. A motor assembly according to claim 1, characterized in that: The front end of the output tube has a plug section, the rear end of the inner tube is inserted into the plug section and rotates within the plug section, and the connection gap includes the gap between the outer wall of the inner tube and the inner wall of the plug section. A mounting hole is provided on the end face of the housing assembly near the output tube along the axial direction of the motor. The rear end of the inner tube passes through the mounting hole, and at least part of the front end of the output tube is disposed in the mounting hole. The inner wall of the plug section, the hole wall of the mounting hole, and the outer wall of the inner tube form a sealing cavity. The sealing cavity communicates with the rotation gap and the connection gap, respectively. The sealing ring is disposed in the sealing cavity, and the sealing ring makes sealing contact with the inner wall of the plug section, the hole wall of the mounting hole, and the outer wall of the inner tube, respectively. The motor assembly according to claim 2 is characterized in that: The inner wall of the mounting hole is provided with an internal thread, and the outer wall of the front end of the output tube is provided with an external thread. The front end of the output tube is threadedly connected to the mounting hole. The motor assembly according to claim 2, characterized in that, The sealing cavity includes a main sealing cavity and a secondary sealing cavity arranged radially from the inside to the outside. The sealing ring includes a first sealing part and a second sealing part. The second sealing part is located in the secondary sealing cavity and is pressed between the bottom of the mounting hole and the end face of the insertion section. The first sealing part is disposed in the main sealing cavity and is radially disposed between the second sealing part and the outer wall of the inner tube. The first sealing part is in sealing contact with the outer wall of the inner tube. The motor assembly according to claim 4 is characterized in that: The first sealing part has a first sealing lip and a second sealing lip. The first sealing lip is in sealing contact with the outer wall of the inner tube, and the second sealing lip is in sealing contact with the inner wall of the insertion section. Both the first sealing lip and the second sealing lip extend circumferentially along the sealing ring, and the first sealing lip and the second sealing lip are respectively arranged around the rotation axis of the sealing ring. The motor assembly according to claim 5 is characterized in that: An annular groove with an opening facing the connection gap is formed between the first sealing lip and the second sealing lip. The motor assembly according to claim 6 is characterized in that: An elastic support is provided inside the annular groove. The motor assembly according to claim 7 is characterized in that: The elastic support includes a metal spring covered with a protective layer. The motor assembly according to any one of claims 2-8 is characterized in that: The shell assembly includes a shell body and a detachable fastener for mounting the rear end of the shell body, wherein the mounting hole is formed on the fastener. The motor assembly according to claim 9 is characterized in that: The fastener includes a connecting sleeve and a mounting sleeve arranged sequentially from front to back. The mounting sleeve is connected to the shell body through the connecting sleeve. The connecting sleeve and the mounting sleeve have an inner boss protruding towards the inner tube at the connection position. The inner boss continuously surrounds the inner tube for one circumference. The inner boss and the inner wall of the mounting sleeve together form the mounting hole. The motor assembly according to claim 10 is characterized in that: The inner boss is provided with a through hole for the inner tube to pass through. The motor assembly according to claim 2 is characterized in that: The output tube is coaxially arranged with the inner tube, and the output tube also includes a main body section disposed at the rear end of the plug section, wherein the inner diameter of the main body section is greater than or equal to the inner diameter of the inner tube. The motor assembly according to claim 12 is characterized in that: The insertion section is provided with a rotating hole for inserting the rear end of the inner tube, and the inner diameter of the rotating hole is larger than the inner diameter of the body section. The motor assembly according to claim 1 is characterized in that: The motor also includes a matching stator and rotor disposed within the housing assembly. The stator is fixed within the housing assembly, and the rotor is rotatably disposed within the housing assembly. The inner tube is coaxially disposed within the rotor and can rotate with the rotor. The motor assembly according to claim 1 is characterized in that: The output tube is provided with anti-detachment barbs at its rear end. A planer handle, characterized in that, The device includes a handle housing and a motor assembly as described in any one of claims 1 to 15, wherein the housing has a mounting cavity, the motor assembly is fixedly disposed within the mounting cavity, and the rear end of the output tube extends out of the handle housing. The planing handle according to claim 16 is characterized in that: The handle housing includes a handle housing, a rear cover, and a screw sleeve. The mounting cavity is formed inside the handle housing, and the motor assembly is fixedly installed inside the mounting cavity. The rear cover covers the rear end of the handle housing and has an opening for the output tube to pass through. The screw sleeve is threaded onto the output tube and is located behind the rear cover, abutting against the rear end of the rear cover. The planing handle according to claim 17 is characterized in that: The outer contour of the output tube includes a limiting step facing away from the motor assembly, and the rear cover is disposed between the limiting step and the screw sleeve. The limiting step is used to limit the rear cover. A surgical power device includes a planing handle as described in claims 16-18 and a tool assembly adapted to the planing handle. The surgical power device according to claim 19 is characterized in that: The cutting tool assembly includes an outer cutting tube and an inner cutting tube passing through the outer cutting tube. The front end of the inner cutting tube is provided with a cutting edge, and the rear end of the cutting tube is connected to and communicates with the inner tube. The inner tube can drive the inner cutting tube to rotate.

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