Medical rotary ultrasonic osteotome

Abstract

The application discloses a medical rotary ultrasonic osteotome, which comprises an ultrasonic vibrator, the ultrasonic vibrator is arranged in a shell, the top of the ultrasonic vibrator is arranged outside the shell and is provided with a grinding needle, a non-contact energy transmission device and a rotary driving device are sequentially arranged in the shell and at the end of the ultrasonic vibrator, the non-contact energy transmission device comprises a main side coil, a main side magnetic core, a secondary side coil and a secondary side magnetic core, the main side magnetic core is provided with a main wire slot, the secondary side magnetic core is provided with a secondary wire slot, the external connecting wire of the main side coil is connected with an external ultrasonic power supply through the main wire slot and a wire port of the rear shell, and the external connecting wire of the secondary side coil is connected with the ultrasonic vibrator through the secondary wire slot and a first wire hole; the rotary driving device comprises a front gear, a rear gear, a connecting main rod and a quick connector. The application aims to provide the rotary ultrasonic osteotome which can improve the bone cutting operation efficiency, reduce the mechanical damage of bone tissue, and combine the advantages of ultrasonic and rotary cutting.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic medical device technology, and in particular to a medical rotating ultrasonic bone scalpel. Background Technology

[0002] The surface quality of bone cutting directly affects the precision of the fit between the prosthesis and bone tissue. Improving the thermal damage present in current bone cutting techniques to achieve safe, efficient, and low-damage bone cutting surgery is a key technical problem that needs to be solved in clinical bone cutting. Currently, ultrasonic bone scalpels in the medical field offer advantages such as minimal bleeding and selective tissue cutting; however, ultrasound-assisted cutting alone is inefficient, and rotary cutting alone involves high cutting forces and significant damage, making it difficult to meet the requirements of high-level medical procedures. Therefore, there is an urgent need for a rotary ultrasonic bone scalpel that can improve the efficiency of bone cutting surgery while reducing mechanical damage to bone tissue, combining the advantages of ultrasound and rotary cutting. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and to provide a rotating ultrasonic bone scalpel that can improve the efficiency of bone cutting surgery while reducing mechanical damage to bone tissue, and can combine the advantages of ultrasound and rotational cutting.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] A medical rotating ultrasonic bone scalpel includes an ultrasonic transducer housed within a housing. The housing is composed of a front housing, a middle housing, a rear housing, and a bottom housing connected by threads. A non-contact energy transmission device and a rotation drive device are sequentially arranged at the end of the ultrasonic transducer within the housing. The ultrasonic transducer is located within the front and middle housings. A stepped sleeve is provided around the outer periphery of the ultrasonic transducer. A connecting spindle is located at the end of the sleeve. A first bearing assembly is located at the step of the sleeve. An inner sleeve is provided between the bearings. An outer sleeve is provided between the bearing end on the front side and the front housing, and the bearing end on the rear side abuts against the middle housing. The connecting spindle has a disk for supporting a magnetic ring on the side facing the ultrasonic transducer. The disk has a first wiring hole. A magnetic core fixing boss and a locking device are provided on the connecting spindle. The locking device is threadedly engaged with the connecting spindle. A gear connecting shaft is provided at the end of the connecting spindle.

[0006] The non-contact energy transmission device includes a main side coil, a main side magnetic core, a secondary side coil, and a secondary side magnetic core. The main side magnetic core is fixedly installed inside the rear housing, and the secondary side magnetic core is installed inside the main side magnetic core. The main side coil is installed inside the main side magnetic core, and the secondary side coil is installed outside the secondary side magnetic core, with the main side coil and the secondary side coil facing each other. The secondary side magnetic core is coaxially installed outside the magnetic core fixing boss and abuts against the locking device. The main side magnetic core is provided with a main through-line groove, and the secondary magnetic core is provided with a secondary through-line groove. The external wire of the main side coil passes through the main through-line groove and the wiring port of the rear housing to connect to an external ultrasonic power supply, and the external wire of the secondary side coil passes through the secondary through-line groove and the first wiring hole to connect to an ultrasonic transducer.

[0007] The rotary drive device includes a front gear, a rear gear, a connecting main rod, and a quick connector. The front gear meshes with the rear gear, the front gear is fixed on the gear connecting shaft, and the rear gear is fixed on the connecting main rod. A second bearing assembly is provided on the outside of the connecting main rod, and the connecting main rod is connected to the quick connector. The outer ring of the second bearing assembly is fitted with a bearing sleeve that is axially fixed to the bottom outer shell.

[0008] Furthermore, the ultrasonic transducer includes an amplitude transformer, a piezoelectric ceramic, and a rear end cover. The amplitude transformer and the rear end cover are provided with a screw hole. A screw rod is provided in the screw hole to connect the amplitude transformer and the rear end cover. The piezoelectric ceramic and an electrode plate are alternately sleeved on the screw rod between the amplitude transformer and the rear end cover. The piezoelectric ceramic is connected to the external wiring of the secondary coil. A flange is provided on the amplitude transformer to connect to the front end of the sleeve.

[0009] Furthermore, the amplitude transformer has a thin rod portion with a reduced diameter, and the piezoelectric ceramic and electrode sheet are provided in at least two layers.

[0010] Furthermore, the sleeve has a connecting surface on the side connected to the flange, and a front connecting hole that mates with the flange hole is provided on the connecting surface. The step of the sleeve has a fixing surface for abutting against the bearing. The side of the sleeve connected to the connecting spindle has a rear connecting hole, and the connecting spindle has a second connecting hole that mates with the rear connecting hole.

[0011] Furthermore, a compression spring is fitted on the side of the connecting main rod that is connected to the quick connector, abutting against the second bearing assembly and the quick connector.

[0012] Furthermore, the main magnetic core has a cylindrical structure with a gap at the bottom, and the secondary magnetic core is provided with a cylinder that can be inserted into the gap of the main magnetic core.

[0013] Furthermore, the bottom outer shell is provided with heat dissipation holes and connection recesses.

[0014] Furthermore, the front and rear outer shells are conical, while the middle and bottom outer shells are cylindrical.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention combines rotational motion with ultrasonic vibration, resulting in a longer microscopic trajectory on the cutting surface and a reduced cutting force per unit length. This minimizes damage to human tissue during cutting and improves the surface quality of the tissue. Because the ultrasonic transducer has a slender section with a reduced diameter, the amplitude output is enhanced. Under the same amplitude requirements, the size of the bone cutter can be set smaller, making grinding surgery easier and improving cutting efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the ultrasonic transducer in this invention;

[0019] Figure 3 This is a schematic diagram of the structure connecting the main shaft in this invention;

[0020] Figure 4 This is a schematic diagram of the sleeve structure in this invention;

[0021] Figure 5 This is a schematic diagram of the main side magnetic core in this invention;

[0022] Figure 6 This is a schematic diagram of the secondary magnetic core in this invention;

[0023] Figure 7 This is a schematic diagram of the structure of the rear outer shell in this invention;

[0024] Figure 8 This is a schematic diagram of the bottom outer shell in this invention.

[0025] Figure label:

[0026] 1-Grinding needle, 2-Ultrasonic transducer, 3-Front housing, 4-Sleeve, 5-Outer sleeve, 6-Middle housing, 7-Inner sleeve, 8-Connecting spindle, 9-Main side magnetic core, 10-Main side coil, 11-Rear housing, 12-Front gear, 13-Rear gear, 14-Bearing sleeve, 15-Connecting main rod, 16-Compression spring, 17-Quick-connector, 18-Bottom housing, 19-Rear small bearing, 20-Front small bearing, 21-Retraction device, 22-Secondary side coil, 23-Secondary side magnetic core, 24-Rear large bearing, 25-Front large bearing , 41-Front connecting hole, 42-Connecting surface, 43-Rear connecting hole, 44-Fixing surface, 81-First wiring hole, 82-Magnetic core fixing boss, 83-Connecting thread, 84-Gear connecting shaft, 85-Second connecting hole, 91-Main cable groove, 111-Connecting port, 181-Heat dissipation hole, 182-Connecting notch, 221-Thin rod section, 222-Amplitude rod, 223-Flange, 224-Flange hole, 225-Piezoelectric ceramic, 226-Electrode plate, 227-Screw, 228-Rear end cover, 231-Secondary cable groove. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 8 As shown, a medical rotating ultrasonic bone scalpel includes an ultrasonic transducer 2, which is housed within a housing. The housing is composed of a front housing 3, a middle housing 6, a rear housing 11, and a bottom housing 18, which are sequentially threaded together. A non-contact energy transmission device and a rotation drive device are sequentially arranged at the end of the ultrasonic transducer 2 within the housing. The ultrasonic transducer 2 is located within the front housing 3 and the middle housing 6. A stepped sleeve 4 is provided on the outer periphery of the ultrasonic transducer 2. A connecting spindle 8 is provided at the end of the sleeve 4. The steps of the sleeve 4... A first bearing assembly is provided at the location, with an inner sleeve 7 between the bearings. An outer sleeve 5 is provided between the bearing end on the front side and the front outer shell 3, and the bearing end on the rear side abuts against the middle outer shell 6. The connecting spindle 8 has a disk for supporting the magnetic ring on the side facing the ultrasonic transducer 2. A first wiring hole 81 is provided on the disk. A magnetic core fixing boss 82 and a locking device 21 are provided on the connecting spindle 8. The locking device 21 is threadedly engaged with the connecting spindle 8. A gear connecting shaft 84 is provided at the end of the connecting spindle 8.

[0029] The non-contact energy transmission device includes a main side coil 10, a main side magnetic core 9, a secondary side coil 22, and a secondary side magnetic core 23. The main side magnetic core 9 is fixedly installed inside the rear outer shell 11, and the secondary side magnetic core 23 is installed inside the main side magnetic core 9. The main side coil 10 is installed inside the main side magnetic core 9, and the secondary side coil 22 is installed outside the secondary side magnetic core 23. The main side coil 10 and the secondary side coil 22 are directly opposite each other. The secondary side magnetic core 23 is coaxially installed outside the magnetic core fixing boss 82 and abuts against the locking device 21. The main side magnetic core 9 is provided with a main through-line groove 91, and the secondary side magnetic core 23 is provided with a secondary through-line groove 231. The external wire of the main side coil 10 passes through the main through-line groove 91 and the wiring port 111 of the rear outer shell 11 to connect with an external ultrasonic power supply. The external wire of the secondary side coil 22 passes through the secondary through-line groove 231 and the first wiring hole 81 to connect with the ultrasonic transducer 2.

[0030] The rotary drive device includes a front gear 12, a rear gear 13, a connecting main rod 15, and a quick connector 17. The front gear 12 meshes with the rear gear 13. The front gear 12 is fixed on the gear connecting shaft 84, and the rear gear 13 is fixed on the connecting main rod 15. A second bearing assembly is provided on the outside of the connecting main rod 15. The connecting main rod 15 is connected to the quick connector 17. The outer ring of the second bearing assembly is fitted with a bearing sleeve 14 that is axially fixed to the bottom outer shell 18.

[0031] like Figure 2As shown, the ultrasonic transducer 2 includes an amplitude transformer 222, a piezoelectric ceramic 225, and a rear end cover 228. The amplitude transformer 222 and the rear end cover 228 are fitted with a screw hole. A screw 227 connecting the amplitude transformer 222 and the rear end cover 228 is disposed within the screw hole. The piezoelectric ceramic 225 and an electrode plate 226 are alternately sleeved on the screw 227 between the amplitude transformer 222 and the rear end cover 228. The piezoelectric ceramic 225 is connected to the external wiring of the secondary coil 22. A flange 223 connected to the front end of the sleeve 4 is provided on the amplitude transformer 222. In this embodiment, the frequency range of the ultrasonic transducer 2 is 20-40kHz, the diameter range is 10-15mm, the length range is 50-70mm, and the power range is 5-15W. The amplitude transformer 222 has a thin rod section 221 with a reduced diameter. The amplitude transformer 222 is divided into a large diameter and a small diameter, with the thin rod section 221 located in the middle of the small diameter. Since the amplitude output is obtained by superimposing the amplitude of each segment of the boom on the basis of the amplitude of the previous segment, compared with the superposition of ordinary booms under a single diameter, the improved boom can produce a higher amplitude superposition effect by superimposing ultrasonic energy propagation under two different diameters, thus enhancing the amplitude output. Therefore, the ultrasonic transducer 2 can efficiently convert the high-frequency electrical energy of the ultrasonic power supply into mechanical energy at the boom 222, and the boom 222 of the same size has a higher amplitude. The piezoelectric ceramic 225 and electrode plate 226 are provided in at least two layers. In this embodiment, the piezoelectric ceramic 225 and electrode plate 226 are arranged in four layers alternately. The arrangement of multiple layers of piezoelectric ceramic 225 and electrode plate 226 can enhance the input power to the ultrasonic transducer 2.

[0032] like Figure 4 As shown, the sleeve 4 has a connecting surface 42 on the side connected to the flange 223. The connecting surface 42 has a front connecting hole 41 that mates with the flange hole 224. The step of the sleeve 4 has a fixing surface 44 for abutting against the bearing. The side of the sleeve 4 connected to the connecting spindle 8 has a rear connecting hole 43. The connecting spindle 8 has a second connecting hole 85 that mates with the rear connecting hole 43. The sleeve 4 serves as a connection between the ultrasonic transducer 2 and the connecting spindle 8. When the connecting main rod 15 drives the connecting spindle 8 to rotate, the sleeve 4 is fixed by its connection to the flange 223, causing the ultrasonic transducer 2 to rotate.

[0033] The stepped transition section of sleeve 4 mates with the first bearing assembly, which consists of a rear large bearing 24 and a front large bearing 25. Its fixing surface 44 connects and positions the front large bearing 25 of the first bearing assembly. An inner sleeve 7 connects the front large bearing 25 and the rear large bearing 24, positioning the distance between the two bearings. An outer sleeve 5 connects the outer end of the front large bearing 25 to the front outer casing 3. By configuring the first bearing assembly, the outer sleeve 5, and the inner sleeve 7, the axial position of sleeve 4 within the middle outer casing 6 is stabilized.

[0034] The connecting main rod 15, connected to the quick connector 17, is fitted with a compression spring 16 that abuts against the second bearing assembly and the quick connector 17. The second bearing assembly consists of a front small bearing 20 and a rear small bearing 19 within the bottom housing 18. The bearing sleeve 14 provides axial fixation for the front small bearing 20 and the rear small bearing 19, thus providing axial support for the connecting main rod 15. When the cutting resistance is too high and the rod cannot be rotated, the quick connector 17 will compress the compression spring 16, disengaging the quick connector 17 from the drive motor and preventing damage to the internal circuitry and wear of components in the bone cutter.

[0035] like Figure 5 and Figure 6 As shown, the main magnetic core 9 has a cylindrical structure with a gap at the bottom, and the secondary magnetic core 23 has a cylinder that can be inserted into the gap of the main magnetic core 9. The separable main magnetic core 9 and secondary magnetic core 23 are easy to install inside the rear housing 11. When it is necessary to change the coil turns ratio, the main magnetic core 9 and secondary magnetic core 23 can be separated without modifying the core size. The coil can be removed, wound, and then reinstalled on the core to adjust the turns ratio. Furthermore, it is easier to wind the main coil 10 and the secondary coil 22.

[0036] like Figure 8 As shown, the bottom outer shell 18 is provided with heat dissipation holes 181 and connecting recesses 182. The heat dissipation holes 181 are used to dissipate heat from inside the shell, and the connecting recesses 182 are used to connect and fix the bone knife to the drive handle when it is in use.

[0037] The front outer shell 3 and the rear outer shell 11 are conical, while the middle outer shell 6 and the bottom outer shell 18 are cylindrical. The outer shells are reduced in size to correspond to the different positions of the internal components, which can reduce the volume and facilitate the axial fixation of small parts.

[0038] In this invention, the external wiring of the main coil 10 passes through the main wiring groove 91 and the wiring port 111 of the rear outer shell 11 to connect to an external ultrasonic power supply. The external wiring of the secondary coil 22 passes through the secondary wiring groove 231 and the first wiring hole 81 to connect to the ultrasonic transducer. The alternating voltage transmitted by the external ultrasonic power supply is transmitted to the secondary coil 22 through electromagnetic induction when passing through the main coil 10. The secondary coil 22 then transmits electrical energy to the electrode plate 226 through the electrode wire, enabling non-contact power supply between the main coil 10 and the secondary coil 22. When the bone cutter is in use, the quick-connect fitting 17 is connected to an external drive motor. When the external drive rotates, it drives the quick-connect fitting 17 to rotate at high speed, thereby sequentially driving the connecting main rod 15, the rear gear 13, the front gear 12, the connecting main shaft 8, the sleeve 4, and the ultrasonic transducer 2 to rotate as a whole, causing the ultrasonic transducer 2 to generate high-speed rotational motion. Simultaneously, the high-speed rotation of the main shaft 8 drives the secondary magnetic core 23 and secondary coil 22 to rotate at high speed, while the main magnetic core 9 and main coil 10 remain stationary on the housing. The main coil 10 is connected to an external ultrasonic power supply, and through electromagnetic induction, it transmits electrical energy to the secondary coil 22, which rotates at high speed with the main shaft 8. The external wiring of the secondary coil 22 then connects to the ultrasonic transducer 2, providing alternating current to the transducer 2, causing it to vibrate ultrasonically. By simultaneously performing rotation and vibration, the grinding needle 1 located at the front end of the amplitude transformer 222 achieves both rotational motion and ultrasonic vibration. Compared to single rotational motion, the combined motion results in a longer cutting path, which is equivalent to increasing the linear velocity of the abrasive grains on the grinding needle 1. Under the same cutting surface, the longer microscopic trajectory is equivalent to a decrease in force per unit length, thus reducing the cutting force. Furthermore, the combination of ultrasonic vibration and rotational cutting, compared to single ultrasonic vibration, improves the material removal rate, increases cutting efficiency, reduces cutting damage, and improves the surface quality of human tissue.

[0039] Because the ultrasonic transducer 222 has a reduced-diameter thin rod section 221, the amplitude of the transducer 222 of the same size is higher, enhancing the amplitude output. This allows for a smaller bone cutter size to meet the same amplitude requirements, making grinding surgery easier and improving cutting efficiency. Furthermore, the separable main magnetic core 9 and secondary magnetic core 23 facilitate coil winding and adjustment of the turns ratio, improving coil winding accuracy to accommodate a smaller bone cutter size.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A medical rotating ultrasonic bone scalpel, comprising an ultrasonic transducer, characterized in that: The ultrasonic transducer (2) is housed inside the outer casing. The top of the ultrasonic transducer (2) extends out of the outer casing and is equipped with a grinding needle (1). The outer casing is composed of a front outer casing (3), a middle outer casing (6), a rear outer casing (11), and a bottom outer casing (18) connected by threads in sequence. Inside the outer casing, a non-contact energy transmission device and a rotary drive device are sequentially arranged at the end of the ultrasonic transducer (2). The ultrasonic transducer (2) is located in the front outer casing (3) and the middle outer casing (6). A stepped sleeve (4) is arranged on the outer periphery of the ultrasonic transducer (2). The end of the sleeve (4) is equipped with a connecting spindle (8). The platform of the sleeve (4) A first bearing assembly is provided at the step, an inner sleeve (7) is provided between the bearings, an outer sleeve (5) is provided between the bearing end on the front side and the front outer shell (3), and the bearing end on the rear side abuts against the middle outer shell (6); the connecting spindle (8) has a disk for supporting the magnetic ring on the side facing the ultrasonic transducer (2), a first wiring hole (81) is provided on the disk, a magnetic core fixing boss (82) and a locking device (21) are provided on the connecting spindle (8), the locking device (21) is threadedly engaged with the connecting spindle (8), and a gear connecting shaft (84) is provided at the end of the connecting spindle (8); The non-contact energy transmission device includes a main side coil (10), a main side magnetic core (9), a secondary side coil (22), and a secondary side magnetic core (23). The main side magnetic core (9) is fixedly installed inside the rear outer shell (11), and the secondary side magnetic core (23) is installed inside the main side magnetic core (9). The main side coil (10) is installed inside the main side magnetic core (9), and the secondary side coil (22) is installed outside the secondary side magnetic core (23). The main side coil (10) and the secondary side coil (22) are directly opposite each other. The secondary side magnetic core (23) is coaxially arranged... The secondary magnetic core (23) is placed outside the magnetic core fixing boss (82) and abuts against the locking device (21). The main magnetic core (9) is provided with a main through-line groove (91), and the secondary magnetic core (23) is provided with a secondary through-line groove (231). The external wire of the main coil (10) passes through the main through-line groove (91) and the wiring port of the rear shell (11) to connect with the external ultrasonic power supply. The external wire of the secondary coil (22) passes through the secondary through-line groove (231) and the first wiring hole (81) to connect with the ultrasonic transducer (2). The rotary drive device includes a front gear (12), a rear gear (13), a connecting rod (15), and a quick connector (17). The front gear (12) meshes with the rear gear (13). The front gear (12) is fixed on the gear connecting shaft (84), and the rear gear (13) is fixed on the connecting rod (15). A second bearing assembly is provided on the outside of the connecting rod (15). The connecting rod (15) is connected to the quick connector (17). The outer ring of the second bearing assembly is fitted with a bearing sleeve (14) that is axially fixed to the bottom outer shell (18).

2. The medical rotating ultrasonic bone scalpel according to claim 1, characterized in that: The ultrasonic transducer (2) includes an amplitude transformer (222), a piezoelectric ceramic (225), and a rear end cover (228). The amplitude transformer (222) and the rear end cover (228) are provided with screw holes. A screw (227) connecting the amplitude transformer (222) and the rear end cover (228) is provided in the screw holes. The piezoelectric ceramic (225) and the electrode plate (226) are alternately sleeved on the screw (227) between the amplitude transformer (222) and the rear end cover (228). The piezoelectric ceramic (225) is connected to the external wiring of the secondary coil (22). A flange (223) connected to the front end of the sleeve (4) is provided on the amplitude transformer (222).

3. The medical rotating ultrasonic bone scalpel according to claim 2, characterized in that: The amplitude rod (222) has a thin rod portion (221) with a reduced diameter, and the piezoelectric ceramic (225) and electrode sheet (226) are provided in at least two layers.

4. A medical rotating ultrasonic bone scalpel according to claim 3, characterized in that: The sleeve (4) has a connecting surface (42) on the side connected to the flange (223). The connecting surface (42) is provided with a front connecting hole (41) that mates with the flange hole (224). The sleeve (4) has a fixed surface (44) at the step for abutting against the bearing. The sleeve (4) has a rear connecting hole (43) on the side connected to the connecting spindle (8). The connecting spindle (8) has a second connecting hole (85) that mates with the rear connecting hole (43).

5. A medical rotating ultrasonic bone scalpel according to claim 1, characterized in that: A compression spring (16) is fitted on the side of the connecting main rod (15) that is connected to the quick connector (17) and abuts against the second bearing assembly and the quick connector (17).

6. A medical rotating ultrasonic bone scalpel according to claim 1, characterized in that: The main side magnetic core (9) has a cylindrical structure with a gap at the bottom, and the secondary side magnetic core (23) is provided with a cylinder that can be inserted into the gap of the main side magnetic core (9).

7. A medical rotating ultrasonic bone scalpel according to claim 1, characterized in that: The bottom outer shell (18) is provided with heat dissipation holes (181) and connection notches (182).

8. A medical rotating ultrasonic bone scalpel according to claim 1, characterized in that: The front shell (3) and the rear shell (11) are conical, while the middle shell (6) and the bottom shell (18) are cylindrical.

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