A disposable planing power system

Abstract

The present invention discloses a disposable planing power system, which belongs to the field of medical device technology, and includes a driving source, a driving member and a transmission member. The driving source includes a flexible shaft and an infusion tube. The driving member includes a rear end cover and a transmission shaft, and the interior of the rear end cover forms a first water passage chamber. The transmission member includes a front end cover, a driven shaft and a knife shaft, and the interior of the front end cover forms a second water passage chamber. The front end cover and the rear end cover are detachably connected, and the driven shaft and the transmission shaft can be engaged with each other, and the first water passage chamber is connected to the second water passage chamber. The motor originally provided in the osteotomy is externally installed in the driving source as a driving device, and the rotation of the motor is transmitted through the flexible shaft, so that the heat generated by the motor will not be transmitted to the knife shaft, causing overheating of the knife shaft and the wound. After removing the motor, the osteotomy is light in weight and has low vibration, which is more convenient for medical staff to perform precise operations.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, in particular to a disposable planing power system. Background Art

[0002] Medical cutting and drilling cutters are critical tools commonly used in neurosurgery, performing procedures such as cutting bone and drilling. They are particularly important instruments in minimally invasive osteotomy for hallux valgus correction. During prolonged, intensive operation, the drill bit and motor generate significant heat, which can adversely affect both the patient and the surgeon, causing tissue damage and prolonging the procedure. Overheating can also lead to drill failure, reducing cutting or drilling efficiency and prolonging surgery. Therefore, effective drill bit cooling is crucial.

[0003] Patent application number CN109330658A discloses a liquid-cooled bone drill comprising a cooling chamber, an internal water inlet, and an internal water outlet. Physiological saline enters the cooling chamber through the internal water inlet, where it cools the drill before being discharged through the internal water outlet. This drill is internally cooled, with the coolant cooling the drill from within. However, after use, the coolant remains inside the drill, potentially breeding bacteria over time and increasing the risk of infection. Therefore, the drill must be disinfected after each use, significantly increasing the workload.

[0004] Traditional osteotomes feature an integrated design, with the blade shaft and motor shaft connected detachably via a chuck key, allowing for easy replacement of blade shafts with different configurations. However, high-speed rotation of the blade shaft wears the chuck key. With increased use, the chuck key gradually ages and loses its retaining function, making it extremely likely that the blade shaft will fall off during surgery, posing a potential risk. Furthermore, the detachable connection between the blade shaft and motor shaft reduces the rigidity and stability of the connection, leading to a decrease in the ability to withstand torque and rotational force, reducing the osteotomy's speed limit. Summary of the Invention

[0005] The purpose of the present invention is to provide a disposable planing power system to solve the problems raised in the above background technology.

[0006] A one-time planing power system is provided, comprising:

[0007] A driving source, comprising a flexible shaft and an infusion tube extending from the driving source;

[0008] The driving member includes a rear end cover and a transmission shaft, the transmission shaft being rotatably connected to the interior of the rear end cover, the interior of the rear end cover forming a first water passage cavity, the other end of the flexible shaft passing through the rear end cover and being fixedly connected to the transmission shaft, and the other end of the infusion tube passing through the rear end cover and communicating with the first water passage cavity;

[0009] The transmission member includes a front end cover, a driven shaft, and a knife shaft, wherein the driven shaft is rotatably connected to the interior of the front end cover, the knife shaft is fixedly connected to the driven shaft and rotatably connected to the interior of the front end cover, a second water passage chamber is formed inside the front end cover, the front end cover and the rear end cover are detachably connected, the driven shaft and the transmission shaft can be engaged with each other, and the first water passage chamber is in communication with the second water passage chamber;

[0010] The driving member and the driving source are reusable components, and the transmission member is a disposable component.

[0011] As a further solution of the present invention: the first water passage cavity is sequentially provided with a first cavity and a plurality of first water flow channels along the water flow direction, the plurality of first water flow channels are arranged along the circumference of the rear end cover, and a filter assembly is annularly provided in the first cavity.

[0012] As a further solution of the present invention: the filter assembly includes a metal branch net and a water-permeable membrane, and the water-permeable membrane is fixedly connected to the interior of the first cavity through the metal branch net.

[0013] As a further solution of the present invention: the water-permeable membrane is an ultrafiltration membrane, and the pore size of the ultrafiltration membrane is between 1nm and 100nm.

[0014] As a further solution of the present invention: the pore size of the ultrafiltration membrane is between 1 nm and 10 nm.

[0015] As a further solution of the present invention: the rear end cover is provided with an internal threaded opening and a sealing opening from the outside to the inside at one end close to the transmission shaft, and the front end cover is provided with an external threaded groove and a sealing groove that cooperate with the internal threaded opening and the sealing opening at one end, the first water flow chamber is connected to the cavity between the internal threaded opening and the sealing opening, and the second water flow chamber is connected to the cavity between the external threaded groove and the sealing groove.

[0016] As a further solution of the present invention: the sealing port is provided with a bending section along the circumferential direction, the inner wall of the sealing groove close to the driven shaft side is formed with a bending port that fits together with the bending section of the sealing port, and a sealing ring is provided on the inclined surface of the bending port.

[0017] As a further solution of the present invention: the transmission shaft is evenly provided with a plurality of limit interfaces along the circumference, and the limit interfaces include an interface vertical surface and an interface curved surface; the driven shaft is evenly provided with a plurality of limit snaps along the circumference that engage with the limit interfaces, and the limit snaps include a snap vertical surface and a snap curved surface.

[0018] As a further solution of the present invention: a sterilization input port is provided on the side wall of the rear end cover, and the sterilization input port is communicated with the first water passage chamber.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The motor originally built into the osteotome is relocated to the drive source, transferring the motor's rotational force through a flexible shaft. This prevents heat generated by the motor from being transferred to the blade shaft, causing overheating and potentially damaging the wound. The osteotome, with the motor removed, is lighter and less vibrating, making it easier for medical staff to perform precise, long-term operations.

[0021] 2. The osteotomy device consists of a driver and a transmission element. The driver is integrated with the drive source and is a reusable component, while the transmission element is a single-use component. The drive shaft in the transmission element is fixedly connected to the blade shaft, allowing the connection to withstand greater torque, improving the blade shaft's rotational speed and stability. This eliminates the risk of the blade shaft falling or breaking during a single surgery, significantly enhancing surgical safety. If the blade shaft needs to be replaced with a different configuration or function, the transmission element can be removed and replaced. Replacing only the transmission element is less expensive and labor-intensive than maintaining or replacing the entire device.

[0022] 3. During hallux valgus surgery, a large amount of bone debris will fly into the osteotomy, making it extremely difficult to clean and requiring high maintenance costs. However, with the osteotomy of the present invention, the transmission components can be disassembled and discarded after the surgery. The drive components are unaffected by bone debris, and wear more slowly, allowing for extended use. Subsequent disinfection is all that is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0024] Figure 1 It is a partial cross-sectional schematic diagram of a one-time planing power system;

[0025] Figure 2 The figure is a schematic diagram of the overall structure of a one-time planing power system;

[0026] Figure 3 A schematic cross-sectional view of a transmission member provided by the present invention;

[0027] Figure 4 for Figure 3 Enlarged view of area A in the middle;

[0028] Figure 5 A schematic cross-sectional view of a driving member provided by the present invention;

[0029] Figure 6 for Figure 5 Enlarged view of area B in the middle;

[0030] Figure 7 A schematic structural diagram of the perspective 1 of the position limiting interface provided by the present invention;

[0031] Figure 8 This is a structural diagram of the perspective 2 of the limiting interface provided by the present invention;

[0032] Figure 9 A schematic structural diagram of the position limiting bayonet provided by the present invention;

[0033] Figure 10 The figure is a schematic diagram of the assembly of a one-time planing power system;

[0034] Figure 11 for Figure 10 Magnified view of area C in the middle.

[0035] In the figure: 1. driving source; 11. flexible shaft; 12. infusion tube; 2. driving member; 21. rear end cover; 211. internal threaded port; 212. blocking port; 213. sterilization input port; 2121. bending section; 22. transmission shaft; 221. limiting interface; 2211. vertical surface of interface; 2212. curved surface of interface; 23. first water flow chamber; 231. first cavity; 232. first water flow channel; 24. filter assembly; 241. metal support net; 242. water permeable membrane; 3. transmission member; 31. front end cover; 311. external threaded groove; 312. blocking groove; 3121. bending port; 32. driven shaft; 321. limiting bayonet; 3211. bayonet vertical surface; 3212. bayonet curved surface; 33. knife shaft; 34. second water flow chamber; 35. sealing ring. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1 and Figure 2As shown, in an embodiment of the present invention, a disposable planing power system includes a driving source 1, a driving member 2, and a transmission member 3. The driving source 1 includes a flexible shaft 11 and a fluid infusion tube 12 extending therefrom. The driving member 2 includes a rear end cover 21 and a transmission shaft 22. The transmission shaft 22 is rotatably connected to the interior of the rear end cover 21. An annular cavity is defined between the interior of the rear end cover 21 and the transmission shaft 22 to form a first water passage cavity 23. The other end of the flexible shaft 11 passes through the rear end cover 21 and is fixedly connected to the transmission shaft 22. The other end of the fluid infusion tube 12 passes through the rear end cover 21 and is in communication with the first water passage cavity 23. The transmission member 3 includes a front cover 31, a driven shaft 32, and a blade shaft 33. The driven shaft 32 is rotatably connected to the interior of the front cover 31. The blade shaft 33 is fixedly connected to the driven shaft 32 and rotatably connected to the interior of the front cover 31. The interior of the front cover 31 forms a second water passage chamber 34. The front cover 31 and the rear cover 21 are detachably connected, and the driven shaft 32 and the transmission shaft 22 can be engaged with each other, communicating between the first water passage chamber 23 and the second water passage chamber 34. The driving member 2 and the drive source 1 are reusable components, while the transmission member 3 is a disposable component.

[0039] See also Figure 1 and Figure 2 As shown, the drive source 1 is internally provided with a drive motor and a water tank. A flexible shaft 11 is connected to the motor shaft of the drive motor. The flexible shaft 11 is a flexible transmission element for transmitting torque and is commonly used to connect two rotating shafts or between a shaft and a rotating component, thereby achieving mechanical transmission. The flexible shaft 11 of the present invention is used to transmit the rotational force of the drive motor, thereby freeing the osteotome from the distance limitations of the motor, allowing the motor to be externally mounted and preventing heat from being transferred to the blade shaft 33 during motor operation. The water tank can deliver physiological saline to the infusion tube 12, which then delivers it to the osteotome to cool the various components.

[0040] The flexible shaft 11 is connected to the drive shaft 22 via a clamping sleeve or clamping clip. The clamping force enables the flexible shaft to transmit torque and rotational motion during rotation. Alternatively, a spline connection can be used between the flexible shaft 11 and the drive shaft 22. The flexible shaft has a spline at its end, and a corresponding slot is provided on the drive shaft 22, allowing torque to be transmitted via the spline.

[0041] When using the osteotomist, the transmission member 3 is assembled with the driver 2. After assembly, the transmission shaft 22 engages with the driven shaft 32, allowing the transmission shaft 22 to transmit torque to the driven shaft 32. When the motor of the drive source 1 is started, the motor shaft drives the flexible shaft 11 to rotate, and the transmission action of the flexible shaft 11 drives the transmission shaft 22 to rotate. The transmission shaft 22 transmits torque to the driven shaft 32 and drives the driven shaft 32 to rotate. The driven shaft 32 then drives the knife shaft 33 to rotate. At the same time, the drive pump in the water tank delivers saline to the infusion tube 12. After the transmission member 3 and the driver 2 are assembled, the first water chamber 23 is connected to the second water chamber 34. The saline passes through the first water chamber 23 and the second water chamber 34 in sequence, and is finally ejected from the output port of the front end cover 31 to cool the knife shaft 33 and the wound.

[0042] During hallux valgus surgery, a large amount of bone debris and other impurities can enter through the gap between the blade shaft 33 and the front cover 31 or the gap in the first water passage chamber 23, making them difficult to clean. Therefore, after the surgery, the transmission member 3 is removed from the driver 2. The transmission member 3 is disposable and can be discarded after removal, eliminating the need for extensive cleaning and maintenance. The transmission member 3 has a small number of components and a simple structure, resulting in a low cost. Frequent replacement of the transmission member 3 extends the service life of the driver 2 and the motor, and reduces cleaning and maintenance costs, ultimately reducing the overall cost of using the osteotome.

[0043] See also Figure 5 and Figure 6 As shown, the first water passage chamber 23 is sequentially provided with a first cavity 231 and a plurality of first water flow channels 232 along the direction of water flow. The plurality of first water flow channels 232 are arranged circumferentially around the rear end cover 21. A filter assembly 24 is annularly disposed within the first cavity 231. The infusion tube 12 passes through the rear end cover 21 and communicates with the first cavity 231. The first cavity 231 is an annular structure, allowing saline to fill the entire interior of the first cavity 231 and be transported to the second water passage chamber 34 through the plurality of first water flow channels 232. Because the saline within the drive source 1 may contain microorganisms such as bacteria, which could potentially pose a risk of infection to the patient if these microorganisms enter the wound through the water flow, a filter assembly 24 is provided within the first cavity 231. The filter assembly 24 filters out microorganisms, reducing the risk of infection for the patient.

[0044] The filter assembly 24 includes a metal mesh 241 and a permeable membrane 242. The permeable membrane 242 is fixedly connected to the interior of the first cavity 231 via the metal mesh 241. The metal mesh 241 has an overall mesh structure and serves to support the permeable membrane 242. The permeable membrane 242 is a microporous membrane that can permeate water molecules and intercept microorganisms, effectively blocking microorganisms outside the membrane and preventing them from traveling along the water flow. Because the permeability of the permeable membrane 242 is related to water pressure, to ensure the water supply efficiency of the interceptor, the permeable membrane 242 must withstand high water pressure. Once attached to the metal mesh 241, the permeable membrane 242 can withstand high water pressure without deformation, preventing the permeable membrane 242 from breaking and losing its interception effect. The material used for the metal mesh 241 can be copper, an antibacterial metal that prevents bacteria from growing and multiplying on its surface, reducing the sterilization pressure of the osteotome. In addition, if the water-permeable membrane 242 is damaged, the water-permeable membrane 242 can be replaced and fixed through the metal support net 241 .

[0045] In one embodiment, the water-permeable membrane 242 is an ultrafiltration membrane, and the pore size of the ultrafiltration membrane is between 1nm and 100nm. Since the diameter of bacteria is above 100nm, an ultrafiltration membrane with a pore size less than 100nm can play a good interception role, and a pore size greater than 1nm can ensure the passage of metal ions and prevent the metal ions in the saline from being blocked by the ultrafiltration membrane. Due to the water pressure limit provided by the driving source 1, the pore size of the water-permeable membrane 242 cannot be too small. Too small a pore size will cause the water flow rate of the water-permeable membrane 242 to be too slow, and it will be impossible to provide enough saline to the knife shaft 33 and the wound for cooling. In addition, when performing hallux valgus surgery, the sprayed saline also plays a role in blowing away bone chips, so the sprayed saline needs to have a certain water pressure, so the pore size of the water-permeable membrane 242 needs to be above 1nm.

[0046] In one embodiment, the pore size of the ultrafiltration membrane is between 1 nm and 10 nm. Since the diameter of viruses ranges from 10 nm to 100 nm, a pore size of 100 nm can only block bacteria but not viruses. Therefore, to ensure that the permeable membrane 242 can adequately clean the water, the pore size of the ultrafiltration membrane can be smaller than 10 nm. However, a pore size that is too small can affect the final ejected water pressure, so the pore size of the ultrafiltration membrane can be controlled based on actual needs.

[0047] See also Figure 3 and Figure 5As shown, the end of the rear end cover 21 close to the transmission shaft 22 is provided with an internal threaded opening 211 and a sealing opening 212 from the outside to the inside, and the end of the front end cover 31 close to the driven shaft 32 is provided with an external threaded groove 311 and a sealing groove 312 that cooperate with the internal threaded opening 211 and the sealing opening 212 respectively. The first water passage chamber 23 is connected to the cavity between the internal threaded opening 211 and the sealing opening 212, and the second water passage chamber 34 is connected to the cavity between the external threaded groove 311 and the sealing groove 312.

[0048] The internal thread opening 211 is provided with an internal thread, and the external thread groove 311 is provided with an external thread. The transmission member 3 and the driving member 2 can be threadedly connected through the internal thread opening 211 and the external thread groove 311. The threaded connection has high reliability, convenient operation, strong stability after connection, and can effectively prevent vibration between the transmission member 3 and the driving member 2. In the process of screwing the external thread groove 311 into the internal thread opening 211, the blocking port 212 will gradually approach the inside of the blocking groove 312. When the external thread groove 311 is screwed in to the limit, the blocking port 212 abuts against the innermost side wall of the blocking groove 312 and fits against the inner ring side wall of the blocking groove 312 to achieve blocking. After the connection is completed, the first water chamber 23 and the second water chamber 34 are connected.

[0049] See also Figure 4 、 Figure 5 、 Figure 10 and Figure 11 As shown, the blocking port 212 is provided with a bending section 2121 along the circumferential direction, and the inner wall of the blocking groove 312 close to the driven shaft 32 is formed with a bending port 3121 that fits with the bending section 2121 of the blocking port 212, and a sealing ring 35 is provided on the inclined surface of the bending port 3121. Due to the influence of processing accuracy, there may be a large gap between the blocking port 212 and the blocking groove 312, so that a good sealing effect cannot be achieved. Through this structure, when the blocking port 212 extends into the blocking groove 312, the bending section 2121 can be tightly attached to the surface of the bending port 3121 and compress the sealing ring 35 on the bending port 3121. The sealing by the sealing ring 35 can effectively prevent physiological saline from entering through the gap between the blocking port 212 and the blocking groove 312 and contacting the transmission shaft 22 and the driven shaft 32, affecting the transmission of torque.

[0050] See also Figure 7-Figure 9As shown, the transmission shaft 22 is uniformly circumferentially provided with a plurality of stopper interfaces 221, each comprising a vertical interface surface 2211 and a curved interface surface 2212. The driven shaft 32 is uniformly circumferentially provided with a plurality of stopper tabs 321, each of which engages with the stopper interfaces 221. The stopper tabs 321 comprise a vertical interface surface 3211 and a curved interface surface 3212. The driven shaft 32 is connected to the front end cover 31 via a bearing, while the transmission shaft 22 is connected to the rear end cover 21 via a bearing. As the internal threaded opening 211 is screwed into the external threaded groove 311, the driven shaft 32 and transmission shaft 22 do not rotate significantly, but instead approach each other until the stopper tabs 321 engage and engage with the stopper interfaces 221.

[0051] Specifically, when the limit bayonet 321 approaches the limit interface 221, the bayonet curved surface 3212 will slide relative to the interface curved surface 2212, allowing the limit bayonet 321 to penetrate deeper into the limit interface 221 until the limit bayonet 321 contacts the bottom of the limit interface 221. When the drive motor is started, the flexible shaft 11 drives the transmission shaft 22 to rotate from the interface vertical surface 2211 toward the bayonet vertical surface 3211. The interface vertical surface 2211 abuts the bayonet vertical surface 3211, allowing the transmission shaft 22 to drive the driven shaft 32 to rotate, thereby achieving torque transmission. This structure does not require personnel to separately assemble the limit bayonet 321 with the limit interface 221. When the internal thread opening 211 and the external thread groove 311 are threadedly connected, the self-engaging limit is achieved.

[0052] See also Figure 1 and Figure 5 As shown, the side wall of the rear end cover 21 is provided with a sterilization input port 213, and the sterilization input port 213 is connected to the first water chamber 23. After the operation is completed, the transmission member 3 is removed and discarded, and the drive member 2 can be sterilized by ethylene oxide. Ethylene oxide is a gas used for disinfection and sterilization, which can inactivate various microorganisms, including bacteria, fungi, viruses and spores. Ethylene oxide sterilization is a low-temperature sterilization method, which is suitable for sterilizing heat-sensitive items and avoids material denaturation or damage that may be caused by high-temperature sterilization. The sterilization input port 213 is used to input ethylene oxide into the first water chamber 23, so that ethylene oxide can penetrate into the interior of the drive member 2 for disinfection and sterilization, and then can be output from one end of the transmission shaft 22 along the first water chamber 23 to achieve gas circulation.

[0053] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A one-time planing power system, characterized in that: include: A driving source (1) comprising a flexible shaft (11) and an infusion tube (12), wherein one end of the flexible shaft (11) and the infusion tube (12) are respectively led out from the driving source (1); A driving member (2), comprising a rear end cover (21) and a transmission shaft (22), wherein the transmission shaft (22) is rotatably connected to the interior of the rear end cover (21), and a first water passage cavity (23) is formed inside the rear end cover (21); the other end of the flexible shaft (11) passes through the rear end cover (21) and is fixedly connected to the transmission shaft (22); the other end of the infusion tube (12) passes through the rear end cover (21) and is in communication with the first water passage cavity (23); the first water passage cavity (23) is sequentially provided with a first cavity (231) and a plurality of first water flow channels (232) along a water flow direction; the plurality of first water flow channels (232) are arranged along the circumference of the rear end cover (21); and a filter assembly (24) is circumferentially provided in the first cavity (231); A transmission member (3), comprising a front end cover (31), a driven shaft (32) and a knife shaft (33), wherein the driven shaft (32) is rotatably connected to the interior of the front end cover (31), the knife shaft (33) is fixedly connected to the driven shaft (32) and the knife shaft (33) is rotatably connected to the interior of the front end cover (31), a second water passage chamber (34) is formed inside the front end cover (31), the front end cover (31) and the rear end cover (21) are detachably connected, the driven shaft (32) and the transmission shaft (22) can be engaged with each other, and the first water passage chamber (23) is communicated with the second water passage chamber (34); An end of the rear end cover (21) close to the transmission shaft (22) is provided with an internal threaded opening (211) and a blocking opening (212) in sequence from the outside to the inside; an end of the front end cover (31) close to the driven shaft (32) is provided with an external threaded groove (311) and a blocking groove (312) respectively cooperating with the internal threaded opening (211) and the blocking opening (212); the first water passage cavity (23) is communicated with the cavity between the internal threaded opening (211) and the blocking opening (212); and the second water passage cavity (34) is communicated with the cavity between the external threaded groove (311) and the blocking groove (312); The driving member (2) and the driving source (1) are reusable components, and the transmission member (3) is a disposable component.

2. A disposable planing power system according to claim 1, characterized in that: The filter assembly (24) comprises a metal branch net (241) and a water-permeable membrane (242); the water-permeable membrane (242) is fixedly connected to the interior of the first cavity (231) via the metal branch net (241).

3. A disposable planing power system according to claim 2, characterized in that: The water-permeable membrane (242) is an ultrafiltration membrane, and the pore size of the ultrafiltration membrane is between 1 nm and 100 nm.

4. A disposable planing power system according to claim 3, characterized in that: The pore size of the ultrafiltration membrane is between 1 nm and 10 nm.

5. A disposable planing power system according to claim 1, characterized in that: The sealing opening (212) is provided with a bending section (2121) along the circumferential direction, and the inner wall of the sealing groove (312) close to the driven shaft (32) is formed with a bending opening (3121) that fits in contact with the bending section (2121) of the sealing opening (212), and a sealing ring (35) is provided on the inclined surface of the bending opening (3121).

6. A disposable planing power system according to claim 1, characterized in that: The transmission shaft (22) is uniformly provided with a plurality of position-limiting interfaces (221) along the circumference, the position-limiting interfaces (221) comprising an interface vertical surface (2211) and an interface curved surface (2212), and the driven shaft (32) is uniformly provided with a plurality of position-limiting bayonets (321) mutually engaged with the position-limiting interfaces (221) along the circumference, the position-limiting bayonets (321) comprising a bayonet vertical surface (3211) and a bayonet curved surface (3212).

7. A disposable planing power system according to any one of claims 1 to 6, characterized in that: A sterilization input port (213) is provided on the side wall of the rear end cover (21), and the sterilization input port (213) is communicated with the first water passage chamber (23).

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