Medical device drive and instrument
By employing a detachable design for the motor core and outer shell, along with a Hall sensor safety component, the problem of shortened lifespan and cross-infection during high-temperature sterilization of dental handpiece motors has been solved, achieving convenient sterilization and safe use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN SENPING PRECISION MANUFACTURING CO LTD
- Filing Date
- 2025-07-07
- Publication Date
- 2026-07-14
AI Technical Summary
Existing dental handpiece motors have a shortened lifespan during high-temperature sterilization, and repeated sterilization may lead to the risk of cross-infection of bacteria. Furthermore, existing protective measures affect the flexibility of use and grip effectiveness.
It adopts a motor core and outer shell structure. The outer shell includes the motor housing and bushing, which are fastened by bolts or integrally formed. Combined with safety components such as Hall sensors and high-temperature magnets, it realizes the detachable design of the motor core and outer shell, ensuring safety and convenience during disinfection.
This allows for multiple disassembly, cleaning, and disinfection of the motor, reducing the risk of cross-infection of bacteria, ensuring safety and flexibility in use, and preventing damage to motor parts.
Smart Images
Figure CN224484179U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dental instruments, and more particularly to a medical device drive device and instrument. Background Technology
[0002] Dental handpieces are commonly used instruments in dental surgery. They generally consist of a drive unit and an instrument unit. The outer shell of the drive unit also serves as the grip. These instruments are typically used in invasive procedures such as implantation and tooth extraction. After surgery, the handpiece is removed from the motor. For the safety of the next patient, in addition to alcohol disinfection, the motor is often sterilized using high-temperature (134°C) autoclave steam sterilization. While the possibility of cross-infection is relatively low during non-invasive surgeries, sterilization of the motor is still a precaution. However, repeated high-temperature sterilization can severely impact the lifespan of some motor components. For example, moisture entering the motor can cause bearing rust; abnormal coil sealing can lead to rotor scraping; bent motor tail wires can cause internal wire breakage; and electronic components on the circuit board can malfunction. Previously, to reduce the number of sterilization cycles, users might wrap the motor surface with disposable film, often requiring several wraps, or cover the outer shell with a silicone sleeve. However, this is cumbersome to install and remove, increases the overall outer diameter, and reduces grip and flexibility. Utility Model Content
[0003] In order to overcome the shortcomings of the prior art, this utility model provides a medical device drive device and instrument.
[0004] First, the medical device drive device in this utility model is implemented using the following technical solution: A medical device drive device includes a motor inner core and an outer shell. The outer shell includes a motor outer shell and a bushing. The bushing is fixed to one end of the motor outer shell and is coaxial with the motor outer shell. The motor outer shell is sleeved on the motor inner core and the shaft of the motor inner core passes through the bushing.
[0005] The other end of the motor core is provided with a tail wire assembly, which abuts against the other end of the motor housing when connected to the motor core.
[0006] The motor housing has a mounting plate at one end for mounting the bushing. The mounting plate has a hole in the center for the shaft of the motor core to pass through, and a threaded hole in the mounting plate for fixing the bushing.
[0007] The threaded holes are symmetrically arranged on the mounting plate with the hole as the center, and bolts are inserted in the threaded holes for installing the bushing.
[0008] The bushing is integrally formed with the motor housing and is coaxial.
[0009] At least one sealing ring groove is formed on the outer wall of the bushing, and an O-ring is provided in each sealing ring groove.
[0010] The tail cable assembly includes a tail cable sleeve and a fitting cup. The fitting cup has an internal thread at its opening, and the end of the motor housing has an external thread that matches the internal thread. A through hole is formed at the bottom of the fitting cup. The tail cable sleeve is fixed on the fitting cup and coaxial with the through hole. When the fitting cup is fitted and fixed on the inner core of the motor, the edge of the fitting cup abuts against the motor housing.
[0011] The bottom of the fitting bowl extends outward to form a fitting ring. A locking ring is provided inside the fitting bowl. One end of the locking ring is fixed to the inner wall of the fitting bowl, and the other end of the locking ring extends toward the fitting ring. A locking groove is provided on the outer wall of the tail wire sleeve. When the tail wire sleeve is inserted from the fitting ring, the locking ring is locked in the locking groove.
[0012] The inner wall of the motor housing is provided with a positioning groove along the length of the motor housing for fitting with the positioning block on the inner core of the motor, and the mounting plate is provided with positioning holes.
[0013] A safety component is provided between the motor housing and the motor core. The safety component includes a Hall sensor and a high-temperature magnet. The high-temperature magnet is fixed inside the motor housing, and the Hall sensor is fixed on the surface of the motor core. When the Hall sensor is separated from the high-temperature magnet, the motor core is de-energized.
[0014] Secondly, the medical device in this utility model adopts the following solution: a medical device: a medical device characterized in that it is driven by the aforementioned medical device driving device.
[0015] Compared to existing technologies, the motor housing and bushing in this invention are fastened with bolts, or the motor housing and connecting shaft are combined into a single part, manufactured in one go, forming a quick-release structure that can adapt to multiple disassemblies and cleaning / sterilization. This ensures that each use is in a near-sterile state after sterilization. In actual use, if sterilization is required, loosening the sleeve cup allows the motor and tail cable assembly to be pulled out. The motor core and tail cable assembly are separable; threads are machined at the tail of the motor housing, using thread engagement to fasten them together. When the tail cable assembly is loosened and removed, there is no need to worry about the motor core and tail cable assembly easily separating and falling off. A high-temperature resistant magnet is fixed inside the motor housing, and a Hall sensor is fixed to the motor. When the housing is disassembled, the magnet separates as well. If the motor is started while bare, because the Hall sensor cannot detect the magnetic field within a specific Gaussian value range, the motor will report an error and not start, preventing accidents caused by the high-speed rotating motor shaft and ensuring safety. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the medical device in this utility model;
[0017] Figure 2 This is a schematic cross-sectional view of the internal structure of the medical device in this utility model;
[0018] Figure 3 This is a schematic diagram of the driving device of the medical device in this utility model;
[0019] Figure 4 This is a cross-sectional schematic diagram of the internal structure of the driving device of the medical device in this utility model.
[0020] Figure 5 This is a schematic diagram of the outer shell structure in the driving device of the medical device of this utility model;
[0021] Figure 6 This is a schematic diagram of the internal structure of the outer shell in the driving device of the medical device of this utility model;
[0022] In the diagram: 1. Motor inner core; 2. Outer shell; 21. Shaft sleeve; 211. Sealing ring groove; 22. Motor housing; 221. Mounting plate; 222. Positioning groove; 3. Tail wire assembly; 31. Tail wire sleeve; 32. Fitting cup; 4. Safety components; 41. High-temperature magnet; 42. Hall sensor; 5. Machine head. Detailed Implementation
[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0024] Reference Figure 1-6 This application discloses a medical device for dental surgery. The medical device includes a drive unit and a head 5, which is used to mount therapeutic instruments. The head 5 is inserted into one end of the drive unit. Since most treatments are invasive, the instruments are typically disposable, and bodily fluids can easily splash onto the surface of the drive unit during use. Therefore, the drive unit usually needs to be sterilized.
[0025] To facilitate disinfection of the motor surface, the medical device drive device used in this application includes a motor inner core 1 and an outer shell 2. The outer shell 2 includes a motor housing 22 and a bushing 21. The bushing 21 is fixed to one end of the motor housing 22 and coaxial with the motor housing 22. The motor housing 22 is fitted onto the motor inner core 1, and the shaft of the motor inner core 1 passes through the bushing 21. The motor inner core 1 is the core component of the motor. During use, the motor housing 22 is fitted onto the outside of the motor inner core 1 to protect it. When bodily fluids splash, they can only splash onto the motor housing 22. Since the motor housing 22 can be easily disassembled and disinfected, only the motor housing 22 needs to be disassembled for disinfection, making disassembly more convenient.
[0026] Specifically, in actual use, the other end of the motor core 1 is equipped with a tail wire assembly 3. When the tail wire assembly 3 is connected to the motor core 1, it abuts against the other end of the motor housing 22. The end of the motor housing 22 used for mounting the bushing 21 is closed by a mounting plate 221. A hole for the shaft of the motor core 1 to pass through is opened in the center of the mounting plate 221, and threaded holes are opened on the mounting plate 221 for fixing the bushing 21. The threaded holes are symmetrically arranged on the mounting plate 221 with the hole as the center, and bolts are inserted into the threaded holes for mounting the bushing 21. Of course, the bushing 21 and the motor housing 22 can also be integrally formed and coaxial. This reduces installation steps and gaps, reduces dead corners for sterilization and disinfection, and makes sterilization and disinfection more thorough.
[0027] Furthermore, at least one sealing ring groove 211 is formed on the outer wall of the bushing 21, and an O-ring is provided in each sealing ring groove 211. The sealing effect of the sealing ring is used to improve the sealing effect, making it less likely for bodily fluids to penetrate into the inner core 1 of the motor.
[0028] The tail cable assembly 3 in this embodiment includes a tail cable sleeve 31 and a fitting bowl 32. The fitting bowl 32 has an internal thread at its opening, and the end of the motor housing 22 has an external thread that matches the internal thread. A through hole is formed at the bottom of the fitting bowl 32. The tail cable sleeve 31 is fixed to the fitting bowl 32 and is coaxial with the through hole. When the fitting bowl 32 is fitted and fixed to the inner core 1 of the motor, the fitting bowl 32 is connected and fixed to the motor housing 22 by threads, and its edge abuts against the motor housing 22. The bottom of the fitting bowl 32 extends outward to form a fitting ring. A locking ring is provided inside the fitting bowl 32. One end of the locking ring is fixed to the inner wall of the fitting bowl 32, and the other end of the locking ring extends toward the fitting ring. A locking groove is provided on the outer wall of the tail cable sleeve 31. When the tail cable sleeve 31 is inserted from the fitting ring, the locking ring engages in the locking groove.
[0029] Based on the above embodiment, a positioning groove 222 is formed on the inner wall of the motor housing 22 along the length of the motor housing 22 for fitting with the positioning block on the motor core 1, and a positioning hole is provided on the mounting plate 221. This is to perform the positioning work of the motor core, thereby avoiding sliding and providing a restriction for proper installation.
[0030] The inner motor core 1 is essentially a motor without its outer casing 2, and its basic functions remain unaffected. Therefore, when the motor casing 22 is sent for sterilization, to prevent accidental activation of the inner motor core 1, a safety component 4 is installed between the outer casing 22 and the inner motor core 1. This safety component 4 includes a Hall sensor 42 and a high-temperature magnet 41. The high-temperature magnet 41 is fixed inside the motor casing 22, and the Hall sensor 42 is fixed to the surface of the inner motor core 1. When the Hall sensor 42 is separated from the high-temperature magnet 41, the inner motor core 1 is de-energized. That is, when the motor casing 22 is sent for sterilization, since the Hall sensor 42 does not detect a change in magnetic field, even if there is a misoperation, the inner motor core will not be activated, thus ensuring safety during use. Specifically, the signal line of the Hall sensor 42 can be directly connected to the circuit board used to control the motor handle. When the circuit board does not detect the signal from the Hall sensor 42, it can directly prevent the trigger signal of the inner motor core from being emitted. In other words, even if the power button is pressed without the motor casing on, the inner motor core cannot be activated, ensuring safe use.
[0031] When the drive device described in this application is used in a medical device (dental handpiece), the outer wall of the drive device serves as the gripping part of the entire dental handpiece. In actual use, the tail cable assembly 3 is first installed, i.e., the push-fit cup 32 is threadedly connected to the end of the motor inner core 1 to push the motor housing 22. That is, the tail cable assembly 3 and the handpiece head 5 together serve as a limiting function. Further, the motor housing 22 is inserted into the motor inner core 1 from the front end (i.e., the end of the motor inner core 1 with the drive shaft). The bushing 21 and the motor housing 22 can be pre-installed or the motor housing 22 can be fitted into place first, and then the bushing 21 is bolted to the end of the motor housing 22. This ensures that the motor housing 22 is always installed in place. The motor inner core 1 can only be started after the motor housing 22 is installed in place, thus ensuring safe use. When the dental handpiece head 5 is installed onto the motor inner core 1, the bushing 21 is correspondingly inserted into the handpiece head 5, ensuring tight contact and proper installation between the handpiece head 5 and the motor drive shaft within the bushing 21. At this time, the handpiece head 5 acts as a limiting element for one end of the assembly between the bushing 21 and the motor housing 22, while the other end of the motor housing is limited by the push of the tail cable assembly. This ensures that the motor housing remains in the correct installed position during use, preventing abnormal slippage.
[0032] When bodily fluids (including but not limited to blood) splash onto the surface of the motor housing 22 during treatment, the motor housing 22 can be disassembled for sterilization. After disassembly, the Hall sensor 42 is moved away from the high-temperature magnet 41 fixed on the motor housing 22, thus preventing the motor core 1 from starting. At this time, the motor housing 22 can be sent for sterilization separately. The motor core 1 cannot be started before sterilization is completed, ensuring safety during use.
[0033] During disassembly, the handpiece 5 is first removed from the bushing 21. At this point, the assembly of the bushing 21 and the motor housing 22 loses one-sided restraint, allowing the entire assembly to be pulled out from the motor core 1. Finally, the tail cable assembly 3 is removed, enabling it to be sent for sterilization along with the motor housing 22. This reduces the risk of infection during the procedure. Liquid splashing typically only occurs when the handpiece 5 is inserted and oral treatment is being performed. Liquid is highly likely to splash onto the handpiece 5, while the probability of splashing onto the motor housing 22 is relatively low, and the probability of splashing onto the tail cable assembly 3 is significantly reduced. Because the bushing 21 and the inside of the handpiece have multiple layers of sealing rings, it is virtually impossible for liquid to penetrate into the motor shaft. Furthermore, when the handpiece and motor are removed, they are relatively far from the oral cavity, making the probability of contamination inside the motor extremely low. Even if contamination does occur, it can be easily disinfected, reducing the risk of cross-infection during repeated use.
[0034] Compared to existing technologies, the motor housing 22 and bushing 21 in this invention are fastened with bolts, or the motor housing 22 and connecting shaft are combined into one part and manufactured in one go, forming a quick-release structure that can adapt to multiple disassemblies and cleaning / sterilization. This ensures that each use is in a near-sterile state after sterilization. In actual use, if sterilization is required, loosen the sleeve cup 32 to pull out the motor and tail cable assembly 3. The motor and tail cable assembly 3 are separable, or they can be made as a single, non-removable unit or secured together with a threaded ring. This way, when the tail cover is loosened and they are removed, there is no need to worry about the motor and tail cable easily separating and falling off. A high-temperature resistant magnet 41 is fixed inside the motor housing 22, and a Hall sensor 42 is fixed to the motor. When the housing is disassembled, the magnet separates as well. When the bare motor is started, because the Hall sensor 42 cannot detect the magnetism within a specific Gaussian value range, the motor will report an error and not start, preventing accidents caused by the high-speed rotating motor shaft and ensuring safety.
[0035] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.
Claims
1. A medical device drive device, characterized in that: It includes a motor inner core and an outer shell. The outer shell includes a motor housing and a bushing. The bushing is fixed to one end of the motor housing and is coaxial with the motor housing. The motor housing is sleeved on the motor inner core and the shaft of the motor inner core passes through the bushing. The other end of the motor core is provided with a tail wire assembly, which abuts against the other end of the motor housing when connected to the motor core.
2. The medical device driving device according to claim 1, characterized in that: The motor housing has a mounting plate at one end for mounting the bushing. The mounting plate has a hole in the center for the shaft of the motor core to pass through, and a threaded hole in the mounting plate for fixing the bushing.
3. The medical device driving device according to claim 2, characterized in that: The threaded holes are symmetrically arranged on the mounting plate with the hole as the center, and bolts are inserted in the threaded holes for installing the bushing.
4. The medical device driving device according to claim 1, characterized in that: The bushing is integrally formed with the motor housing and is coaxial.
5. A medical device driving device according to any one of claims 1-4, characterized in that: At least one sealing ring groove is formed on the outer wall of the bushing, and an O-ring is provided in each sealing ring groove.
6. A medical device driving device according to claim 1, characterized in that: The tail cable assembly includes a tail cable sleeve and a fitting cup. The fitting cup has an internal thread at its opening, and the end of the motor housing has an external thread that matches the internal thread. A through hole is formed at the bottom of the fitting cup. The tail cable sleeve is fixed on the fitting cup and coaxial with the through hole. When the fitting cup is fitted and fixed on the inner core of the motor, the edge of the fitting cup abuts against the motor housing.
7. A medical device driving device according to claim 6, characterized in that: The bottom of the fitting bowl extends outward to form a fitting ring. A locking ring is provided inside the fitting bowl. One end of the locking ring is fixed to the inner wall of the fitting bowl, and the other end of the locking ring extends toward the fitting ring. A locking groove is provided on the outer wall of the tail wire sleeve. When the tail wire sleeve is inserted from the fitting ring, the locking ring is locked in the locking groove.
8. A medical device driving device according to claim 2, characterized in that: The inner wall of the motor housing is provided with a positioning groove along the length of the motor housing for fitting with the positioning block on the inner core of the motor, and the mounting plate is provided with positioning holes.
9. A medical device driving device according to claim 2, characterized in that: A safety component is provided between the motor housing and the motor core. The safety component includes a Hall sensor and a high-temperature magnet. The high-temperature magnet is fixed inside the motor housing, and the Hall sensor is fixed on the surface of the motor core. When the Hall sensor is separated from the high-temperature magnet, the motor core is de-energized.
10. A medical device, characterized in that: Driven by the medical device drive device as described in any one of claims 1-9.