Power assembly for ultrasonic osteotome and ultrasonic osteotome

Abstract

The invention relates to the field of medical instruments, in particular to a power assembly for an ultrasonic osteotome and the ultrasonic osteotome. A power assembly for an ultrasonic osteotome comprises a motor used for providing power for a tool bit, the tool bit is fixed to the front end of an amplitude-change pole, the amplitude-change pole receives torque output by the motor through a second linkage piece and a first linkage piece, the second linkage piece is provided with a linkage groove and is arranged on the amplitude-change pole, and the first linkage piece is arranged on the first linkage piece. The first linkage piece is provided with a linkage protrusion movably matched in the linkage groove, and the output end of the motor rotates to enable the linkage protrusion to do reciprocating motion in the axial direction of the amplitude-change pole. The first linkage piece moves in the axial direction of the amplitude-change pole under the action of the motor, so that the linkage protrusion moves in the axial direction of the amplitude-change pole and pushes the amplitude-change pole with the second linkage piece to move in the axial direction of the amplitude-change pole.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a power assembly for an ultrasonic osteotome and an ultrasonic osteotome. Background Art

[0002] The ultrasonic bone knife converts electrical energy into mechanical energy through a transducer, causing the blade to generate high-frequency vibrations, which can be used for cutting bone tissue. For example, the ultrasonic bone knife disclosed in the patent application number 202123047423.3 has a drive unit installed at the tail of the body unit, and a working unit installed at the front end of the body unit. The working unit includes a blade and an adapter. The adapter is embedded in one end of the housing, and the blade is embedded in the adapter. The blade and the adapter are fixedly connected by a connecting assembly, and the adapter is connected to the transducer at the end away from the blade. Ultrasonic bone knife bone cutting has the advantages of being minimally invasive, precise, and safe. It has the advantages of being able to improve surgical results and reduce postoperative complications. However, conventional ultrasonic bone knives have low cutting efficiency, which will result in longer surgery time and higher requirements for the blade and equipment.

[0003] Patent application number 202311598097.6 discloses an ultrasonic bone knife, including a power component, which includes a motor and a gear set. The gear set drives the blade to swing rapidly, and the transducer component of a conventional ultrasonic bone knife converts electrical energy into mechanical energy, so that the blade can be faster and sharper when sawing bones, thereby using ultrasound to improve the cutting efficiency of the orthopedic surgical saw and shorten the orthopedic surgery time to a certain extent.

[0004] However, the use of the above-mentioned gear set increases the complexity of the internal structure of the ultrasonic bone knife. The processing, assembly and debugging of multiple gears require higher precision and cost. In addition, the maintenance of the gear set is relatively complicated and requires regular inspection and lubrication.

[0005] At the same time, the above solution is to make the blade head swing radially relative to the amplitude rod, that is, when cutting bone tissue, the entire ultrasonic bone knife has to be used upright, and it is difficult to assist in cutting through wrist movement. The ultrasonic bone knife cannot be held like a conventional knife. It is difficult to control and achieve subtle adjustments when holding it, and it requires high operating skills and experience of medical personnel. Summary of the Invention

[0006] The purpose of the present invention is to provide a power assembly for an ultrasonic osteotome which has a simpler structure, is easier to hold, and is convenient for medical personnel to perform bone tissue cutting.

[0007] To achieve the above-mentioned purpose, the present invention adopts a power assembly for an ultrasonic bone knife, including a motor for providing power to the blade head, and the blade head is fixed to the front end of the amplitude converter, and is characterized in that: the amplitude converter receives the torque output by the motor through a second linkage member and a first linkage member, the second linkage member is provided with a linkage groove and is arranged on the amplitude converter, the first linkage member has a linkage protrusion that is movably fitted in the linkage groove, and the output end of the motor rotates to make the linkage protrusion reciprocate along the axial direction of the amplitude converter.

[0008] The solution of the present invention relies on the cooperation of the first linkage part and the second linkage part, and uses fewer parts than a more complex gear set. The first linkage part can be fixed to the output end of the motor, and the second linkage part can be fixed to the amplitude rod. There is no need to rotate and fix fixed parts such as the gear and the housing, making the internal structure of the ultrasonic bone knife simpler.

[0009] The movement of the ultrasonic bone knife of the present invention is achieved through the axial movement of the amplitude rod. This movement method is more intuitive and easy to control. Medical personnel can hold the ultrasonic bone knife of the present invention in the same way as holding a conventional knife, thereby achieving precise control of the cutting direction, and the operating skills and experience requirements of the medical personnel are lower. Even less experienced medical personnel can quickly master the use of the ultrasonic bone knife and perform effective bone tissue cutting, which not only improves the efficiency of the operation, but also reduces the surgical risks caused by improper operation and improves the safety of the operation. At the same time, compared with the method of using a gear set to achieve radial shaking of the blade head, the axial movement method is more stable, reduces the deviation and shaking of the blade head during the cutting process, and improves the accuracy and efficiency of the cutting.

[0010] Among them, any existing structure that can convert rotational motion into linear reciprocating motion can be used to achieve axial movement of the linkage protrusion of the first linkage part, and then achieve axial reciprocating motion of the amplitude rod and the cutter head with the second linkage part.

[0011] Preferably, the first linkage member includes an inner linkage member fixed to the output end of the motor and an outer linkage member rotatably fixed outside the inner linkage member, the linkage protrusion is arranged on the outer linkage member, and the rotation axis of the inner linkage member forms an angle with the rotation axis of the outer linkage member.

[0012] When the amplitude variable rod is restricted from rotating, the linkage protrusion is restricted by the second linkage part, and the rotation axis of the inner linkage part is not coaxial with the rotation axis of the outer linkage part, the linkage protrusion of the outer linkage part will move along the axial direction of the amplitude variable rod, and each time the inner linkage part completes a rotation in sequence, the linkage protrusion completes a reciprocating motion.

[0013] Compared to conventional transmission structures (such as connecting rods and screws), the rotational structure of this invention is more compact, enabling a smaller and lighter ultrasonic osteotome handle. Furthermore, compared to conventional transmission structures, the transmission path is shorter, energy transfer links are reduced, motor output torque is effectively transmitted to the horn, and friction and vibration between components are reduced. The internal and external linkages can be secured by existing solutions such as bearings for rotational fixation.

[0014] Preferably, the inner wall of the outer linkage member and the outer wall of the inner linkage member are provided with mutually cooperating annular guide grooves, the axes of which intersect and form an angle with the rotational axis of the inner linkage member. The annular guide grooves are fitted with at least three guide balls, with a portion of each ball positioned within the annular guide groove of the outer linkage member and a portion of each ball positioned within the annular guide groove of the inner linkage member. This rotational fixation between the outer and inner linkage members utilizes less space and lowers production costs compared to a bearing connection.

[0015] Preferably, the linkage protrusion includes a first linkage protrusion engaged in the linkage groove and a second linkage protrusion fixed to the first linkage member, wherein a connecting hole that cooperates with each other and a connecting protrusion that extends into the connecting hole are provided between the first linkage protrusion and the second linkage protrusion. Such an arrangement facilitates assembly of the first linkage member and the second linkage member.

[0016] Preferably, the first linkage protrusion and the second linkage protrusion constitute a T-shaped linkage protrusion, the axis of the second linkage protrusion intersects with the axis of the amplitude changing rod, and the second linkage member is provided with a clearance notch for making way for the second linkage protrusion.

[0017] The present invention also discloses an ultrasonic bone knife with a power assembly for the above-mentioned ultrasonic bone knife, including a shell, the knife head extends outside the shell, the motor and part or all of the amplitude transformer are located in the shell, the amplitude transformer has a front limit protrusion and a rear limit protrusion extending circumferentially outward and spaced front to back, and a limit portion located between the front limit protrusion and the rear limit protrusion is fixed in the shell.

[0018] By setting the above structure, the axial limitation of the amplitude variable rod is achieved, and the amplitude variable rod is prevented from causing excessive displacement of the cutter head, thereby ensuring the cutting effect and accuracy.

[0019] Preferably, the front limiting protrusion constitutes a front limiting surface in the form of an arc or a slope, the rear limiting protrusion constitutes a rear limiting surface in the form of an arc or a slope, and the surface of the limiting portion for contacting the front limiting surface and the rear limiting surface is a slope or an arc.

[0020] During the operation of the ultrasonic bone knife, the amplitude rod vibrates at a high frequency, and frequent contact and friction will occur between the limiting surface and the limiting part. When the arc or inclined limiting surface contacts the limiting part, it can disperse the contact stress compared to the flat contact, thereby reducing the wear of the limiting surface and the limiting part, extending their service life, and reducing noise.

[0021] Preferably, the stopper comprises a plurality of spherical stopper elements surrounding the circumferential outer side of the horn, with the inner ends of the stopper elements positioned within the stopper groove formed between the front and rear stopper projections. The spherical stopper elements are rotatable, further extending the service life.

[0022] The present invention has the advantages of simpler structure, easy to hold, and convenient for medical personnel to perform bone tissue cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of the ultrasonic osteotome of the present invention.

[0024] Figure 2 It is a structural schematic diagram of the first linkage member and the second linkage member of the present invention.

[0025] Figure 3 It is a structural schematic diagram of the first linkage member of the present invention.

[0026] Figure 4 It is a cross-sectional view of the first linkage member and the second linkage member when the amplitude transformer of the ultrasonic osteotome of the present invention moves backward to the extreme position.

[0027] Figure 5 It is a structural schematic diagram of the limiting portion of the ultrasonic osteotome when the amplitude rod of the ultrasonic osteotome moves backward to the extreme position.

[0028] Figure 6 It is a cross-sectional view of the first linkage member and the second linkage member when the amplitude transformer of the ultrasonic osteotome of the present invention moves forward to the limit position.

[0029] Figure 7 It is a structural schematic diagram of the limiting portion of the ultrasonic osteotome when the amplitude changing rod of the ultrasonic osteotome moves forward to the limit position. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1 Depend on Figure 1 and Figure 2As shown, this embodiment discloses a power assembly for an ultrasonic bone scalpel, including a motor 200 for providing power to a blade head 100. The blade head 100 is fixed to the front end of a horn 1. The motor 200 is used to drive the horn 1 to reciprocate along its own axis. The horn 1 receives the torque output by the motor 200 through a second linkage 3 and a first linkage 2. The second linkage 3 is provided with a linkage groove and is arranged on the horn 1. The first linkage 2 has a linkage protrusion that flexibly fits within the linkage groove. The output end of the motor 200 rotates to cause the linkage protrusion to reciprocate along the axis of the horn, thereby pushing the horn 1, to which the second linkage 3 is fixed, to move along its own axis. The horn 1 of this embodiment is a component of the transducer assembly of a conventional ultrasonic bone scalpel, and the front end can be used with blade heads of different shapes.

[0032] Depend on Figures 2 to 7 As shown, the first linkage member 2 includes an inner linkage member 21 fixed to the output end of the motor and an outer linkage member 22 rotatably fixed outside the inner linkage member 21. The outer linkage member 22 is in a circular ring shape, and the inner linkage member 21 is spherical at the ends. A linkage protrusion is provided on the outer linkage member 22, and the rotation axis of the inner linkage member 21 and the rotation axis of the outer linkage member 22 form an angle.

[0033] The inner wall of the outer linkage member 22 and the outer wall of the inner linkage member 21 are provided with an annular guide groove 210 that cooperates with each other. The axis of the annular guide groove 210 is staggered with the rotation axis of the inner linkage member 21 and forms an angle. The annular guide groove 210 is matched with multiple guide balls 211. Part of the guide ball 211 is located in the annular guide groove of the outer linkage member 22, and the other part of the guide ball 211 is located in the annular guide groove of the inner linkage member 21.

[0034] The linkage protrusions include a first linkage protrusion 213 that fits within the linkage groove, and a second linkage protrusion 214 fixed to the outer linkage member 22. A mating connection hole 215 and a connecting protrusion extending into the connection hole 215 are provided between the first linkage protrusion 213 and the second linkage protrusion 214. The first linkage protrusion 213 and the second linkage protrusion 214 form a T-shaped linkage protrusion. The axis of the second linkage protrusion 214 intersects the axis of the horn 1. The second linkage member 3 is provided with a clearance notch 31 that makes way for the second linkage protrusion 214 and communicates with the mating groove. The mating groove of the second linkage member 3 extends through the side of the second linkage member 3 along a line parallel to the radial direction of the horn 1. The second linkage protrusion 214 is fitted with retaining rings at both ends to restrict axial movement of the second linkage protrusion 214.

[0035] Example 2 Depend on Figure 1 、 Figure 5 and Figure 7As shown, this embodiment is an ultrasonic bone knife having the power assembly for the ultrasonic bone knife described in Example 1, including a shell 300, a blade head 100 extending outside the shell, a motor 200 and most of the amplitude transformer 1 are located in the shell 300, and the front section of the amplitude transformer 1 has a front limiting protrusion 11 and a rear limiting protrusion 12 extending circumferentially outward and spaced front to back, and a limiting portion located between the front limiting protrusion 11 and the rear limiting protrusion 12 is fixed in the shell 300.

[0036] Among them, the front section of the amplitude transformer 1 extends circumferentially outward to form an annular front limiting protrusion 11 and a rear limiting protrusion 12, the front limiting protrusion 11 constitutes a conical arc-shaped front limiting surface, and the rear limiting protrusion 12 constitutes a conical arc-shaped front limiting surface. The limiting portion includes a plurality of spherical limiting portion monomers 13, and the surface of the limiting portion for contacting the front limiting surface and the rear limiting surface is a spherical surface. The plurality of limiting portion monomers are arranged in a ring-shaped and evenly spaced manner around the circumferential outside of the amplitude transformer 1, and the inner end of the limiting portion monomer 13 is located in the limiting groove 10 formed between the front limiting protrusion 11 and the rear limiting protrusion 12.

[0037] Among them, in order to ensure the dynamic sealing of the front end of the amplitude transformer 1, a flexible seal 4 is provided between the amplitude transformer 1 and the shell 300. The flexible seal 4 of this embodiment is in the shape of a bellows and is composed of multiple alternating continuous valleys and peaks. The front and rear ends of the flexible seal 4 are respectively a front end sealing part 41 extending circumferentially inward and in contact with the amplitude transformer 1, and a rear end connection part 42 extending circumferentially outward and directly or indirectly fixed to the shell 300. When the amplitude transformer 1 drives the cutter head 100 to move forward and backward, the circumferential outer wall of the front limit protrusion 11 is close to or in contact with the valley of the flexible seal 4.

[0038] When the ultrasonic bone knife of this embodiment is in use, the transducer provided by the ultrasonic bone knife realizes high-frequency vibration of the amplitude converter and the blade head fixed on the amplitude converter, and then the motor drives the amplitude converter and the blade head to perform reciprocating motion. The high-frequency vibration enables the blade head to quickly cut into the bone tissue, and the reciprocating motion further accelerates the cutting process. This synergistic effect enables the blade head to complete more cutting work per unit time, thereby significantly improving the cutting efficiency and thus shortening the operation time.

[0039] The blade moves axially, a more stable motion than traditional radial movement. This reduces blade deviation and oscillation during the cutting process, allowing medical personnel to more precisely control the cutting direction and depth. Furthermore, medical personnel can operate the ultrasonic osteotome like a conventional knife, making subtle adjustments through wrist movements, reducing the requirements for operational skill and experience. Even less experienced medical personnel can quickly master the use of the ultrasonic osteotome and perform effective bone tissue cutting, improving surgical safety.

[0040] This embodiment, through the combination of high-frequency vibration and axial reciprocating motion, has the advantages of improving cutting efficiency, enhancing cutting accuracy, reducing operating difficulty, reducing wear and noise, improving equipment reliability and enhancing surgical safety, which can make the application of ultrasonic bone knife in orthopedic surgery more efficient, safe and reliable.

Claims

1. A power assembly for an ultrasonic osteotome, comprising a motor for providing power to a cutting head, wherein the cutting head is fixed to the front end of a horn, and characterized in that: The horn receives the torque output by the motor through a second linkage and a first linkage. The second linkage is provided with a linkage slot and mounted on the horn. The first linkage has a linkage protrusion that fits flexibly within the linkage slot. The output end of the motor rotates to cause the linkage protrusion to reciprocate along the horn's axis. Driven by the motor, the first linkage moves axially along the horn, causing the linkage protrusion to move axially along the horn and, in turn, push the horn, which has the second linkage, to move axially along itself.

2. The power assembly for ultrasonic osteotome according to claim 1, characterized in that: The first linkage member includes an inner linkage member fixed to the output end of the motor and an outer linkage member rotatably fixed outside the inner linkage member. The linkage protrusion is provided on the outer linkage member, and the rotation axis of the inner linkage member forms an angle with the rotation axis of the outer linkage member.

3. The power assembly for ultrasonic osteotome according to claim 2, characterized in that: The inner wall of the outer linkage part and the outer wall of the inner linkage part are provided with annular guide grooves that cooperate with each other. The axis of the annular guide groove is staggered with the rotation axis of the inner linkage part and forms an angle. At least three guide balls are matched with the annular guide groove. Part of the guide ball is located in the annular guide groove of the outer linkage part, and the other part of the guide ball is located in the annular guide groove of the inner linkage part.

4. The power assembly for ultrasonic osteotome according to claim 1, characterized in that: The linkage protrusion includes a first linkage protrusion fitted in the linkage groove and a second linkage protrusion fixed to the first linkage member. A matching connecting hole and a connecting protrusion extending into the connecting hole are provided between the first linkage protrusion and the second linkage protrusion.

5. The power assembly for ultrasonic osteotome according to claim 4, characterized in that: The first linkage protrusion and the second linkage protrusion form a T-shaped linkage protrusion, the axis of the second linkage protrusion intersects with the axis of the amplitude changing rod, and the second linkage member is provided with a clearance notch for making way for the second linkage protrusion.

6. An ultrasonic osteotome having a power assembly for an ultrasonic osteotome according to any one of claims 1 to 5, comprising a housing, the blade extending outside the housing, and a motor and part or all of the horn located within the housing, characterized in that: The amplitude transformer has a front limiting protrusion and a rear limiting protrusion extending outward in the circumferential direction and spaced apart from each other. A limiting portion located between the front limiting protrusion and the rear limiting protrusion is fixed in the shell.

7. The ultrasonic osteotome according to claim 6, characterized in that: The front limiting protrusion constitutes a front limiting surface in the form of an arc or an inclined surface, the rear limiting protrusion constitutes a rear limiting surface in the form of an arc or an inclined surface, and the surface of the limiting portion for contacting the front limiting surface and the rear limiting surface is an inclined surface or an arc surface.

8. The ultrasonic osteotome according to claim 6 or 7, characterized in that: The limiting portion includes a plurality of spherical limiting portion monomers, which surround the circumferential outer side of the amplitude transformer, and the inner ends of the limiting portion monomers are located in the limiting groove formed between the front limiting protrusion and the rear limiting protrusion.

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