Tibial translation motor

Abstract

This invention belongs to the field of medical device technology, specifically relating to a tibial transverse displacement motor, including a housing, a base, a drive mechanism, a movable component, and a position monitoring unit. The drive mechanism drives the movable component to reciprocate along its length. The position monitoring unit monitors the displacement of the movable component. The position monitoring unit includes: a positioning strip disposed on the side wall of the movable component, with multiple perforated holes spaced along its length; and a light interruptor fixedly disposed on the base, with the positioning strip passing through the detection channel of the light interruptor. This invention, by providing a positioning strip with perforated holes on the side wall of the movable component, in conjunction with the light interruptor, converts the linear displacement of the movable component into the periodic on / off switching of light signals, and then accurately calculates the displacement through pulse counting. This solution has a simple structure and small size, making it particularly suitable for the miniaturization requirements of medical devices.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a tibial transverse movement motor. Background Technology

[0002] Tibial transverse bone transport is an important technique for treating orthopedic diseases such as tibial defects, nonunion, and chronic osteomyelitis. This technique involves applying continuous and controlled traction force to the tibia using a traction device to promote bone regeneration and repair.

[0003] In existing technologies, tibial movement can be achieved using a tibial transverse traction motor. However, in these solutions, the distance traveled and the current position of the tibial region cannot be obtained in real time with precision. In clinical applications, physicians need to precisely control the amount of traction displacement according to the treatment plan, and open control methods lacking position feedback cannot meet this requirement, potentially leading to insufficient or excessive traction, thus affecting treatment outcomes. Summary of the Invention

[0004] The present invention addresses the above-mentioned technical problems by providing a tibial transverse movement motor.

[0005] A tibial transverse movement motor includes a housing, a base, a drive mechanism, and a movable component. The housing and the base form a hollow cavity. The drive mechanism and the movable component are disposed within the hollow cavity. Both ends of the movable component extend beyond the outer side of the housing in the length direction. The drive mechanism drives the movable component to reciprocate along its length direction.

[0006] It also includes a position monitoring unit disposed in the hollow cavity, the position monitoring unit being used to monitor the displacement of the moving part;

[0007] The location monitoring unit includes:

[0008] A positioning strip is provided on the side wall of the movable part. The length direction of the positioning strip is consistent with the length direction of the movable part, and a plurality of hollow holes penetrating its thickness direction are spaced apart along its length direction on the positioning strip.

[0009] A light interruptor, wherein the light interruptor is fixedly mounted on the base, and the positioning strip passes through the detection channel of the light interruptor;

[0010] When the movable part moves, the positioning strip moves synchronously with the movable part. The light signal of the light interruptor is periodically switched on and off through the hollow hole and outputs a corresponding pulse signal. The moving distance of the movable part is obtained according to the number of pulses of the pulse signal, so as to realize the monitoring of the moving position of the movable part.

[0011] Optionally, the position monitoring unit is provided in two sets, and in the two sets of position monitoring units, the hollow holes in the two positioning strips are staggered in the length direction of the movable part;

[0012] In the two sets of position monitoring units, the two optical interrupters output a first pulse signal and a second pulse signal respectively, and the movement direction of the moving part is determined based on the phase difference between the first pulse signal and the second pulse signal.

[0013] Optionally, in the two sets of position monitoring units, the two positioning bars are respectively disposed on the same side wall of the movable part and arranged along the direction perpendicular to the length of the movable part.

[0014] Optionally, in the two sets of position monitoring units, the two positioning bars are respectively disposed on the two opposite side walls of the movable part.

[0015] Optionally, the positioning strip is integrally formed with the movable part.

[0016] Optionally, the plurality of the hollow holes are evenly distributed at equal intervals along the length direction of the positioning strip.

[0017] Optionally, the light interruptor has an inverted U-shaped detection groove, and the detection channel is located between two opposing inner walls of the inverted U-shaped detection groove.

[0018] The positioning strip passes through the inverted U-shaped detection groove of the light interrupter, and the light-emitting element and the light-receiving element of the light interrupter are respectively disposed on the two opposite inner sidewalls of the inverted U-shaped detection groove.

[0019] Optionally, the tibial transverse movement motor further includes a frame disposed within the hollow cavity, the frame spanning the outer side of the top of the movable member, the bottom end of the frame being fixed to the base, and the frame being used to limit the movable member to move only along its length direction; the light interrupter is located on the side of the frame.

[0020] Optionally, the top of the frame is provided with a through hole, a limiting member is installed at the top of the frame, a protruding post is provided at the bottom of the limiting member, the protruding post is inserted into the through hole, and a ball limiting groove is provided at the bottom of the protruding post; the top of the movable member is provided with a ball guide groove, and a ball is placed between the ball guide groove and the ball limiting groove, so that when the movable member moves, the ball rotates in the ball limiting groove.

[0021] Optionally, the top of the frame is provided with a first positioning hole, and the limiting member is provided with a second positioning hole corresponding to the first positioning hole. The limiting member and the frame are fixedly connected by positioning bolts that are sequentially inserted into the first positioning hole and the second positioning hole.

[0022] Optionally, the inner wall of the top of the frame is provided with a ball limiting groove or a ball guiding groove, and a ball is placed between the ball limiting groove or ball guiding groove of the frame and the ball guiding groove provided at the top of the movable part.

[0023] Optionally, the driving mechanism consists of several piezoelectric sheets stacked on the base, with friction plates fixedly mounted on the top of the piezoelectric sheets, and friction protrusions intermittently provided on the top of the friction plates, the friction protrusions contacting the moving part;

[0024] When the magnitude and direction of the current passed through the piezoelectric sheets change, the tops of the piezoelectric sheets form a wave-like undulating motion. The friction plate follows the piezoelectric sheets and generates a wave-like undulating motion, which drives the moving part to move.

[0025] Optionally, the base is provided with a piezoelectric plate mounting slot, and a plurality of piezoelectric plates are installed in the piezoelectric plate mounting slot. The piezoelectric plates are powered by the base's built-in circuitry or an external circuitry.

[0026] Optionally, the upper edge of the base is provided with a magnet mounting groove, and a magnet is installed in the magnet mounting groove; a metal sheet is fixed or pre-embedded at the bottom of the movable part, and the metal sheet and the magnet are arranged opposite to each other and attract each other.

[0027] Beneficial effects: The present invention has at least one or more of the following advantages:

[0028] 1. This invention converts the linear displacement of the moving part into the periodic on / off switching of light signals by setting a positioning strip with perforated holes on the side wall of the moving part, in conjunction with a light interruptor, and then accurately calculates the displacement through pulse counting. This solution has a simple structure and small size, making it particularly suitable for the miniaturization requirements of medical devices.

[0029] 2. This invention, by setting up two sets of staggered monitoring units and utilizing the phase difference of the two pulse signals, can not only measure the displacement but also determine the direction of movement of the moving part in real time. This effectively avoids the directional ambiguity and position drift problems caused by a single sensor in reciprocating motion due to identical pulse counts. The staggered arrangement of the perforations on the two sets of positioning strips allows for the analysis of the rising and falling edges of the two pulse signals, enabling the acquisition of more edge events within a single pulse cycle, thereby significantly improving the resolution of position detection. This achieves improved detection accuracy without increasing the number of perforations, balancing manufacturing cost and detection performance. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of one structure of the present invention;

[0031] Figure 2 for Figure 1 AA section view;

[0032] Figure 3 for Figure 1 Exploded view;

[0033] Figure 4 for Figure 3 Further exploded view;

[0034] Figure 5 for Figure 4 Further exploded view of the central base and its upper structure;

[0035] Figure 6 This is a diagram showing the positional relationship between the movable component and the positioning strip of the present invention;

[0036] Figure 7 This is a schematic diagram showing the positional relationship between the frame, the limiting member, and the ball bearings of the present invention.

[0037] Figure 8 for Figure 7 Another angle of the exploded view. Detailed Implementation

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are only for illustrating the essential spirit of the technical solution of the present invention.

[0039] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0040] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0041] In the following description, in order to clearly demonstrate the structure and operation of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0042] This invention provides a tibial transverse movement motor, including a housing, a base, a drive mechanism, a moving part, and a position monitoring unit.

[0043] The outer shell and the base form a hollow cavity. The drive mechanism, moving parts and position monitoring unit are all located in the hollow cavity. The two ends of the moving parts extend out of the outer shell along their length direction. The drive mechanism drives the moving parts to move back and forth along their length direction.

[0044] The position monitoring unit is used to monitor the displacement of the moving part. The unit includes a positioning strip and a light interrupter. The positioning strip is located on the side wall of the moving part, with its length direction aligned with the length direction of the moving part. Multiple perforated holes extending through the thickness direction are spaced along the length of the positioning strip. The light interrupter is fixedly mounted on the base, and the positioning strip passes through the detection channel of the light interrupter.

[0045] When the moving part moves, the positioning strip moves synchronously with the moving part. The light signal of the light interruptor is periodically switched on and off through the hollow hole and outputs a corresponding pulse signal. The moving distance of the moving part is obtained according to the number of pulses of the pulse signal, so as to realize the monitoring of the moving position of the moving part.

[0046] The pulse signal output by the position monitoring unit can be fed back to the control end of the drive mechanism to adjust the output state of the drive mechanism, realize closed-loop control of the position of the moving part, and improve the accuracy and safety of tibial traction therapy.

[0047] This invention, through a positioning strip with perforated holes on the side wall of the moving part, combined with a light interruptor fixed to the base, converts the linear displacement of the moving part into the periodic on / off switching of light signals, and then accurately calculates the displacement through pulse counting. This monitoring method has a simple structure, fast response speed, and can obtain the current position information of the moving part in real time.

[0048] The combination of the positioning strip and the light interruptor has a simple structure, occupies little space, and can be integrated into the hollow cavity of the tibial transverse motor without affecting the overall size of the device. It is particularly suitable for medical device applications with strict requirements on size.

[0049] The light interruptor detects light by switching it on and off, without direct contact with moving parts (the positioning strip passes through the detection channel but does not contact the light-emitting / light-receiving element), thus avoiding the wear and signal drift problems caused by friction in contact sensors, and has a longer service life and stable detection performance.

[0050] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0051] Reference Figures 1 to 8 This embodiment provides a tibial transverse movement motor, which includes a housing 10, a base 20, a drive mechanism 30, a movable component 40, and a position monitoring unit.

[0052] The outer shell 10 and the base 20 form a hollow cavity, preferably formed by a snap-fit ​​connection. The drive mechanism 30, the movable component 40, and the position monitoring unit are disposed within the hollow cavity. The two ends of the movable component 40 extend beyond the outer side of the outer shell 10 along its length, for connecting to the traction component in the medical equipment. The drive mechanism 30 drives the movable component 40 to reciprocate along its length, thereby performing traction treatment on the patient's tibia via the traction component. The movable component 40 has the following length direction... Figure 1 The left and right directions are shown.

[0053] The position monitoring unit is used to monitor the displacement of the moving part 40. The position monitoring unit includes a positioning bar 51 and a light interruptor 52.

[0054] The positioning strip 51 is disposed on the side wall of the movable part 40, and the length direction of the positioning strip 51 is consistent with the length direction of the movable part 40. The positioning strip 51 has a plurality of hollow holes 511 that penetrate its thickness direction at intervals along its length direction.

[0055] The shape of the cutout 511 can be circular, rectangular, or any other arbitrary shape, as long as it allows the light signal from the light interruptor 52 to pass through. In specific implementations, the shape, size, and spacing of the cutout 511 can be adjusted according to the required detection accuracy. The smaller the spacing of the cutout 511, the more pulses per unit length, and the higher the detection accuracy.

[0056] The light interruptor 52 is fixedly mounted on the base 20, and the positioning strip 51 passes through the detection channel of the light interruptor 52. The light interruptor 52 is also called a penetrating photoelectric sensor or photoelectric interruptor. The light interruptor 52 arranges the light-emitting element and the light-receiving element face to face and puts them in the same package. It realizes the detection function by using the principle that the light will be blocked when the detected object passes through.

[0057] Of course, the optical interrupter 52 can also be a reflective optical interrupter instead of a transmissive optical interrupter, as long as the periodic change of the light signal during the movement of the positioning strip 51 can be achieved. The perforated hole 511 on the positioning strip 51 can also be replaced by an alternating arrangement of reflective strips / light-absorbing strips (used in conjunction with a reflective optical interrupter), which can also achieve the position detection function.

[0058] The working principle of this embodiment is as follows:

[0059] As the movable part 40 moves, the positioning strip 51 moves synchronously with it. The light-emitting element of the light interruptor 52 continuously emits light, which passes through the detection channel to reach the light-receiving element of the light interruptor 52. Since the positioning strip 51 is provided with a cutout hole 511, when the cutout hole 511 moves between the light-emitting element and the light-receiving element, the light passes through the cutout hole 511 to reach the light-receiving element. At this time, the light-receiving element is in a light-receiving state, and the light interruptor 52 outputs a light-passing signal accordingly. When the solid part of the positioning strip 51 moves between the light-emitting element and the light-receiving element, the light is blocked, the light-receiving element is in a light-blocking state, and the light interruptor 52 outputs a light-blocking signal. It should be noted that the specific logic level corresponding to the light-passing signal and the light-blocking signal depends on the configuration of the internal and external circuits of the light interruptor. For example, in a common NPN open-collector output configuration, a low level is output when light is passable and a high level is output when light is blocked. This embodiment does not impose any special limitations on this.

[0060] Thus, during the movement of the movable component 40, the light signal of the light interruptor 52 is periodically switched on and off through the perforated hole 511, and a corresponding pulse signal is output, namely, alternating output of light-passing and light-blocking signals. Based on the number of pulses in the pulse signal and the spacing of the perforated hole 511, the movement distance of the movable component 40 can be calculated.

[0061] For example, if the spacing of the perforated holes 511 is d, and the number of detected pulses is N, then the moving distance of the moving part 40 is d / N. This enables real-time monitoring of the 40 positions of the moving parts.

[0062] In one embodiment, two sets of position monitoring units are provided, each set having a positioning strip 51 and a light interrupter 52. In the two sets of position monitoring units, the perforations 511 in the two positioning strips 51 are staggered along the length of the movable member 40. In the two sets of position monitoring units, the two light interrupters 52 output a first pulse signal and a second pulse signal, respectively. Due to the staggered arrangement of the perforations 511 in the two positioning strips 51, there is a phase difference between the first pulse signal and the second pulse signal. The movement direction of the movable member 40 is determined based on the phase difference between the first pulse signal and the second pulse signal.

[0063] When the movable part 40 moves forward (e.g., pulled upward), the rising / falling edge of the first pulse signal changes before the second pulse signal, meaning the first pulse signal leads the second pulse signal. When the movable part 40 moves backward (e.g., retracted downward), the rising / falling edge of the second pulse signal changes before the first pulse signal, meaning the first pulse signal lags behind the second pulse signal.

[0064] The direction of movement of the movable part 40 can be determined in real time by detecting the phase relationship between the two pulse signals (i.e., determining which signal changes first). At the same time, the movement distance of the movable part 40 can still be calculated by the number of pulses in any one pulse signal.

[0065] Secondly, by analyzing the rising and falling edges of the two pulse signals, more edge events can be obtained within one pulse cycle, thereby improving the resolution of position detection without increasing the number of cutouts.

[0066] In addition, by setting up two sets of monitoring units, when one set fails, the other set can still work independently and provide displacement detection, which enhances the fault tolerance and reliability of the system.

[0067] In one embodiment, in the two sets of position monitoring units, the perforated holes 511 in the two positioning strips 51 are staggered by 1 / 4 hole spacing along the length of the movable part 40. Because the perforated holes 511 on the two positioning strips are staggered by 1 / 4 hole spacing, there is a 90° phase difference between the first pulse signal and the second pulse signal.

[0068] When the movable part 40 moves forward (e.g., pulled upward), the rising / falling edge of the first pulse signal changes before the second pulse signal, that is, the first pulse signal leads the second pulse signal by 90°. When the movable part 40 moves in the reverse direction (e.g., retracted downward), the rising / falling edge of the second pulse signal changes before the first pulse signal, that is, the first pulse signal lags the second pulse signal by 90°.

[0069] Furthermore, by detecting the rising and falling edges of the two pulse signals, the detection accuracy can be increased from one aperture distance to one-quarter aperture distance (i.e., four times the frequency), further improving the accuracy of position monitoring.

[0070] Of course, in specific implementation, the hole spacing of the hollow holes 511 in the two positioning strips 51 can be arranged according to the actual needs of the scenario, and is not limited to being staggered by 1 / 4 hole spacing.

[0071] In one embodiment, reference is made to Figure 1 and Figure 6In the two sets of position monitoring units, two positioning strips 51 are respectively set on two opposite side walls of the movable part 40. That is, one positioning strip 51 is set on the front side wall of the movable base 40, and the other positioning strip 51 is set on the rear side wall of the movable base 40. Each positioning strip has multiple hollow holes 511. Two light interruptors 52 are respectively installed at corresponding positions on the base 20 and work in conjunction with their respective positioning strips.

[0072] In this embodiment, the two positioning strips are arranged on opposite sides to avoid mutual interference between the two positioning strips and reduce the requirements for the width of the side wall of the moving part.

[0073] In another embodiment, the two positioning strips are respectively disposed on the same side wall of the movable part and arranged along a direction perpendicular to the length of the movable part 40. That is to say, the two positioning strips can also be arranged on the same side, which is compact and facilitates wiring and installation.

[0074] In practice, the two positioning strips can be arranged side by side along the height of the moving part or along the width of the moving part.

[0075] Whether the two positioning strips are arranged on opposite sides or on the same side, properly separating the two positioning strips in space can effectively reduce mutual interference between the two optical signals and ensure the clarity and reliability of the pulse signal.

[0076] Whether the two positioning strips are arranged on both sides or on the same side, the perforated holes 511 on them are arranged in a staggered manner.

[0077] In one embodiment, the positioning strip 51 is integrally formed with the movable part 40.

[0078] The positioning strip and the moving part are integrally molded, such as by machining or injection molding. This eliminates the need for separate assembly steps between the positioning strip and the moving part, reduces the number of parts and assembly processes, and helps to reduce manufacturing costs and improve production efficiency. It also avoids positioning deviations caused by assembly errors in split structures, ensures the precise positional relationship between the positioning strip and the moving part, and improves the accuracy of displacement detection.

[0079] In one embodiment, a plurality of perforated holes 511 are evenly distributed at equal intervals along the length direction of the positioning strip 51.

[0080] The perforated holes are evenly distributed at equal intervals along the length of the positioning strip, so that the displacement corresponding to each pulse signal remains constant, which is equal to the spacing of the perforated holes. The controller only needs to perform simple pulse counting and multiplication operations to calculate the accurate displacement, reducing the complexity of signal processing.

[0081] In one embodiment, the light interruptor 52 has an inverted U-shaped detection groove, with a detection channel between the two opposing inner sidewalls of the inverted U-shaped detection groove. The positioning strip 51 passes through the inverted U-shaped detection groove of the light interruptor 52, and the light-emitting element and the light-receiving element of the light interruptor 52 are respectively disposed on the two opposing inner sidewalls of the inverted U-shaped detection groove.

[0082] This embodiment adopts an inverted U-shaped detection groove design, which ensures precise alignment between the light-emitting element and the light-receiving element. Its open structure facilitates the installation of the positioning strip. When the positioning strip passes through the inverted U-shaped groove, the optical path is stable, the signal quality is high, and the anti-interference ability is strong.

[0083] In one embodiment, reference is made to Figures 2 to 4 The tibial transverse movement motor also includes a frame 60, which is disposed within the hollow cavity. The frame 60 spans the outer side of the top of the movable member 40, and the bottom end of the frame 60 is fixed to the base 20. The frame 60 can limit the range of motion of the movable member 40, allowing the movable member 40 to move only along its length. The length of the frame 60 is shorter than the length of the movable member 40, meaning that both ends of the movable member 40 extend beyond the frame 60. The frame 60 is preferably positioned across the middle of the movable member 40, and the light interrupter 52 is located on the side of the frame 60.

[0084] In practical implementation, the frame 60 can adopt an inverted U-shaped structure, and the bottom end of the frame 60 is engaged and fixed with the engaging grooves 24 provided on both sides of the base 20.

[0085] In one embodiment, reference is made to Figure 4 One or more ball bearings 70 are provided between the top of the movable part 40 and the frame 60. When the movable part 40 moves, the ball bearings 70 reduce the friction of the movable part.

[0086] In specific implementation, refer to Figure 3 , Figure 4 , Figure 7 and Figure 8 The top of the frame 60 is provided with a through hole 61, and a limiting member 62 is fixedly installed on the top of the frame 60. The bottom end of the limiting member 62 is provided with a protrusion 63, which is inserted into the through hole 61. The bottom end of the protrusion 63 is provided with a ball limiting groove 64.

[0087] Reference Figure 3 , Figure 4 and Figure 6 The top of the movable part 40 is provided with a ball guide groove 42, and the length direction of the ball guide groove 42 is consistent with the length direction of the movable part 40. A ball 70 is placed between the ball guide groove 42 and the ball limiting groove 64. When the movable part 40 moves, the ball 70 rotates in the ball limiting groove 64.

[0088] The structure of the limiting component 62 is for the convenience of installing and limiting the ball 70. In the design structure, the limiting component 62 can also be omitted, and a ball limiting groove or a ball guide groove corresponding to the moving part can be set directly inside the frame 60 to accommodate the ball. It can also reduce the friction of the moving part. The specific design is as follows:

[0089] The inner wall of the top of the frame 60 is provided with a ball limiting groove or a ball guiding groove, and a ball 70 is placed between the ball limiting groove or ball guiding groove of the frame 60 and the ball guiding groove 42 provided at the top of the movable part 40.

[0090] In one embodiment, reference is made to Figure 8 The top of the frame 60 is provided with a first positioning hole 65, and the limiting member 62 is provided with a second positioning hole 66 corresponding to the first positioning hole 65. The limiting member 62 and the frame 60 are fixedly connected by positioning bolts that are sequentially inserted into the first positioning hole 65 and the second positioning hole 66.

[0091] The limiting component is fixedly connected to the frame using positioning bolts, ensuring that it will not loosen or shift due to vibration or external forces during long-term use, thus ensuring that the balls are always in the correct working position. The bolt connection facilitates the installation and removal of the limiting component; when replacing the balls or performing internal maintenance, simply remove the positioning bolts to remove the limiting component – ​​a simple operation. Through the cooperation of the positioning holes and positioning bolts, the relative position between the limiting component and the frame is precisely positioned, ensuring accurate alignment between the ball limit groove and the ball guide groove of the moving part, allowing the balls to roll within the correct track.

[0092] In practice, the number of positioning holes can be determined by one or more based on the actual needs of the scenario, such as... Figure 8 As shown, a first positioning hole 65 is provided on each side of the top of the frame 60, and two second positioning holes 66 are provided on the limiting member 62.

[0093] In one embodiment, reference is made to Figure 5 The drive mechanism 30 consists of several piezoelectric sheets stacked on the base 20. The piezoelectric sheets can be powered by internal wiring within the base 20 or by external wiring. The top of the piezoelectric sheets is in contact with the movable part 40. When the piezoelectric sheets are energized or de-energized, the tops of the several layers of piezoelectric sheets form a wave-like undulating motion. The piezoelectric sheets drive the movable part 40 to move along its length through the wave-like undulating motion.

[0094] This embodiment employs a compact design that combines piezoelectric stacking with movable components, enabling the size of the piezoelectric motor (excluding the extended portions at both ends of the movable component 40) to be limited to a space of 10mm × 20mm × 20mm. This achieves the conversion of micron-level deformation of piezoelectric materials into macroscopic millimeter-level stroke within an extremely small volume.

[0095] Compared with piezoelectric devices such as piezoelectric motors commonly used in the prior art, this embodiment, due to its design of piezoelectric stacking and moving parts, can simultaneously meet the requirements of large stroke (15mm ~ 20mm) and output a pushing force (e.g. 1 Newton) sufficient to push the tibial bone fragment while maintaining a small volume.

[0096] In one embodiment, reference is made to Figure 5 The base 20 is provided with a piezoelectric sheet mounting groove 21, and several layers of piezoelectric sheets are installed in the piezoelectric sheet mounting groove 21, with the several layers of piezoelectric sheets stacked on top of each other.

[0097] In one embodiment, reference is made to Figure 4 and Figure 5 It also includes a friction plate 31. Among the several layers of piezoelectric sheets, the friction plate 31 is fixedly installed on the top of the top piezoelectric sheet. The top of the friction plate 31 is in contact with the moving part 40.

[0098] When the magnitude and direction of the current passing through the piezoelectric sheets change, the top of the piezoelectric sheets forms a wave-like undulating motion. The friction plate 31 moves in a wave-like undulating motion along with the piezoelectric sheets, and the friction plate 31 drives the movable part 40 to move along its length direction through the wave-like undulating motion.

[0099] The friction plate 31 is preferably made of a thinner metal sheet, which has better wear resistance than piezoelectric sheets.

[0100] In one embodiment, reference is made to Figure 4 and Figure 5 The friction plate 31 has intermittent friction protrusions 311 at its top end, which contact the moving part 40. The friction protrusions 311 can provide a better undulating effect when the friction plate 31 moves in a wave-like manner with the piezoelectric plate, thereby improving the movement performance of the moving part 40.

[0101] In practical implementation, the length direction of the friction protrusions 311 is a horizontal direction perpendicular to the length direction of the moving part 40. Several friction protrusions 311 are arranged at intervals along the length direction of the friction plate 31, that is, in the left-right direction.

[0102] The friction protrusion 311 is preferably integrally formed with the friction plate 31.

[0103] In one embodiment, reference is made to Figure 4 and Figure 5 To increase the friction between the piezoelectric sheet / friction plate 31 and the moving part 40, a magnet mounting groove 22 is provided on the upper edge of the base 20, and a magnet 23 is installed in the magnet mounting groove 22. A metal plate 41 is fixed or pre-embedded at the bottom of the moving part 40, and the metal plate 41 and the magnet 23 are arranged opposite each other and attract each other.

[0104] In practical implementation, a piezoelectric plate mounting groove 21 can be set in the middle of the base, and four magnet mounting grooves 22 can be set on the upper edge of the base 20. The four magnet mounting grooves 22 are arranged around the piezoelectric plate mounting groove 21.

[0105] In this embodiment, the pre-tightening force is provided by the attraction between the magnet 23 and the metal sheet 41, so that the bottom end of the movable part 40 is tightly abutted against the piezoelectric sheet / friction sheet 31, which increases the friction between the piezoelectric sheet / friction sheet 31 and the movable part 40 and improves the driving effect of the piezoelectric sheet on the movable part 40.

[0106] In this embodiment, the metal sheet 41 is preferably made of iron.

[0107] In one embodiment, a counterweight plate is provided at the bottom of several stacked piezoelectric sheets, and the mounting plate is disposed in the piezoelectric sheet mounting groove 21.

[0108] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A tibial transverse movement motor, characterized in that, The tibial transverse movement motor includes a housing, a base, a drive mechanism, and a movable component. The housing and the base form a hollow cavity. The drive mechanism and the movable component are disposed in the hollow cavity. The two ends of the movable component extend out of the outer side of the housing in the length direction. The drive mechanism drives the movable component to reciprocate along its length direction. The tibial transverse movement motor also includes a position monitoring unit disposed in the hollow cavity, the position monitoring unit being used to monitor the displacement of the moving part; The location monitoring unit includes: A positioning strip is provided on the side wall of the movable part. The length direction of the positioning strip is consistent with the length direction of the movable part, and a plurality of hollow holes penetrating its thickness direction are spaced apart along its length direction on the positioning strip. A light interruptor, wherein the light interruptor is fixedly mounted on the base, and the positioning strip passes through the detection channel of the light interruptor; When the movable part moves, the positioning strip moves synchronously with the movable part. The light signal of the light interruptor is periodically switched on and off through the hollow hole and outputs a corresponding pulse signal. The moving distance of the movable part is obtained according to the number of pulses of the pulse signal, so as to realize the monitoring of the moving position of the movable part.

2. The tibial transverse movement motor as described in claim 1, characterized in that, The position monitoring unit is provided in two sets. In the two sets of position monitoring units, the hollow holes in the two positioning strips are staggered in the length direction of the movable part. In the two sets of position monitoring units, the two optical interrupters output a first pulse signal and a second pulse signal respectively, and the movement direction of the moving part is determined based on the phase difference between the first pulse signal and the second pulse signal.

3. The tibial transverse movement motor as described in claim 2, characterized in that, In the two sets of position monitoring units, the two positioning bars are respectively disposed on the same side wall of the movable part and arranged along the direction perpendicular to the length of the movable part; Alternatively, in the two sets of position monitoring units, the two positioning bars are respectively disposed on the two opposite side walls of the movable component.

4. The tibial transverse movement motor as described in claim 1, characterized in that, The positioning strip is integrally formed with the movable part; Alternatively, the plurality of the hollowed-out holes are evenly distributed at equal intervals along the length direction of the positioning strip.

5. The tibial transverse movement motor as described in claim 1, characterized in that, The light interruptor has an inverted U-shaped detection groove, and the detection channel is located between the two opposite inner walls of the inverted U-shaped detection groove. The positioning strip passes through the inverted U-shaped detection groove of the light interrupter, and the light-emitting element and the light-receiving element of the light interrupter are respectively disposed on the two opposite inner sidewalls of the inverted U-shaped detection groove.

6. The tibial transverse movement motor as described in claim 1, characterized in that, The tibial transverse movement motor also includes a frame disposed within the hollow cavity, the frame spanning the outer side of the top of the movable component, the bottom end of the frame being fixed to the base, and the frame being used to limit the movable component to move only along its length direction; the light interruptor is located on the side of the frame.

7. The tibial transverse movement motor as described in claim 6, characterized in that, The top of the frame is provided with a through hole, and a limiting member is installed at the top of the frame. The bottom end of the limiting member is provided with a protrusion, which is inserted into the through hole. The bottom end of the protrusion is provided with a ball limiting groove. The top of the movable member is provided with a ball guide groove. A ball is placed between the ball guide groove and the ball limiting groove. When the movable member moves, the ball rotates in the ball limiting groove. The top of the frame has a first positioning hole, and the limiting member has a second positioning hole corresponding to the first positioning hole. The limiting member and the frame are fixedly connected by positioning bolts that pass through the first positioning hole and the second positioning hole in sequence.

8. The tibial transverse movement motor as described in claim 6, characterized in that, The inner wall at the top of the frame is provided with a ball limiting groove or a ball guiding groove, and a ball is placed between the ball limiting groove or ball guiding groove of the frame and the ball guiding groove provided at the top of the movable part.

9. The tibial transverse movement motor as described in any one of claims 1 to 8, characterized in that, The driving mechanism consists of several piezoelectric sheets stacked on the base. Friction plates are fixedly installed on the top of the piezoelectric sheets. Friction protrusions are intermittently provided on the top of the friction plates, and the friction protrusions are in contact with the moving part. When the magnitude and direction of the current passed through the piezoelectric sheets change, the tops of the piezoelectric sheets form a wave-like undulating motion. The friction plate follows the piezoelectric sheets and generates a wave-like undulating motion, which drives the moving part to move.

10. The tibial transverse movement motor as described in claim 9, characterized in that, The base is provided with a piezoelectric sheet mounting slot, and a plurality of piezoelectric sheets are installed in the piezoelectric sheet mounting slot. The piezoelectric sheets are powered by the base’s built-in circuitry or external circuitry. And / or, the upper edge of the base is provided with a magnet mounting groove, and a magnet is installed in the magnet mounting groove; a metal sheet is fixed or pre-embedded at the bottom of the movable part, and the metal sheet and the magnet are arranged opposite to each other and attract each other.

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