Stability test fixture for medical powered handles

Abstract

The utility model provides a kind of stability test tool of medical power handle, the power output by the power handle to be measured is transmitted to transmission shaft through standard pole, transmission shaft is reduced to transmission output shaft by sun gear, planetary gear, inner tooth ring and planet carrier, and output shaft drives load through coupling to carry out torque test.In the process of driving load, the rotational speed output by the power handle to be measured is measured by hall sensor at transmission shaft, and rotational speed test and torque test are integrated, compact structure, high integration, high precision, good stability, can effectively evaluate the running stability of the power handle to be measured under different conditions by rotational speed and load torque, and then it is convenient to make objective evaluation and feedback to product performance.

Description

Technical Field

[0001] This utility model relates to the field of medical power handle testing technology, and in particular to a stability testing fixture for a medical power handle. Background Technology

[0002] A surgical power unit is a medical device used in surgical procedures to drill, mill, saw, grind, shave, and plan human bone and / or soft tissues. As a crucial component of the surgical power unit, the stability testing of its motor is critical to ensuring surgical efficiency and safety. Motor stability testing includes measuring the motor's speed and torque, accurately detecting whether its stability under no-load or load conditions meets standards. This verifies equipment reliability and ensures operational precision and surgical outcomes.

[0003] In existing technologies, speed and torque sensors can directly test the speed and torque of the motor in a medical power handpiece simultaneously. However, due to limitations in torque measurement range, speed and torque sensors cannot test the torque of motors with speeds exceeding 20,000 rpm (Revolutions Per Minute). Furthermore, with technological advancements, some high-speed medical power handpiece motors have exceeded 100,000 rpm. Therefore, existing technologies cannot meet the requirements for direct torque measurement at high speeds, thus failing to satisfy the stability testing requirements of medical power handpieces at high speeds. Summary of the Invention

[0004] This invention provides a stability testing fixture for a medical power handle, which solves the technical problem that existing medical power handle testing technologies cannot meet the stability testing requirements at high speeds.

[0005] This utility model provides a stability testing fixture for a medical powered handpiece, the stability testing fixture for the medical powered handpiece comprising:

[0006] A reducer housing, wherein an internal gear ring is provided inside the reducer housing;

[0007] A reducer housing is installed inside the reducer housing, and an output shaft is rotatably mounted on the reducer housing. The output shaft is used to connect an external load for torque testing.

[0008] A planetary assembly includes a planet carrier and planetary gears mounted on the planet carrier, the planet carrier being connected to the output shaft, and the planetary gears meshing with the internal gear ring.

[0009] A transmission assembly includes a transmission shaft for transmitting power to a medical power handle. The transmission shaft is coaxially arranged with the output shaft, and one end of the transmission shaft is provided with a sun gear. The sun gear extends into the reducer housing and meshes with the planetary gear.

[0010] A Hall effect sensor is disposed on the transmission assembly and located on the outer periphery of the transmission shaft. The Hall effect sensor is used to measure the rotational speed of the transmission shaft.

[0011] In one embodiment of the present invention, the reducer base is circular, and the reducer housing and the output shaft are arranged coaxially.

[0012] In one embodiment of the present invention, the planetary carrier and the end of the output shaft are integrally formed, and the planetary gear is rotatably mounted on the planetary carrier.

[0013] In one embodiment of the present invention, the reducer housing is provided with a bearing for supporting the output shaft.

[0014] In one embodiment of this utility model, the planetary gear is provided in three parts, and the three novel gears are evenly distributed in a ring on the outside of the sun gear.

[0015] In one embodiment of the present invention, the transmission assembly further includes a support base, which is connected to the reducer housing. The transmission shaft is rotatably mounted on the support base. One end of the transmission shaft is provided with the sun gear, and the other end of the transmission shaft is provided with a connecting part for connecting to the medical power handle to be tested.

[0016] In one embodiment of the present invention, the reducer housing is cylindrical and has a first end and a second end along the axial direction. The support base is installed at the first end of the reducer housing, and the reducer seat is installed at the second end of the reducer housing.

[0017] In one embodiment of the present invention, the support base is further provided with an installation cavity, the drive shaft passes through the installation cavity, the Hall assembly further includes a Hall plate and a magnetic element, the magnetic element is disposed on the drive shaft and located in the installation cavity; the Hall plate is mounted on the support base and is at least partially located in the installation cavity, the Hall plate is provided with at least one Hall sensor, the Hall sensor extends into the installation cavity and is located outside the magnetic element.

[0018] In one embodiment of the present invention, the transmission assembly further includes a potting retainer ring disposed in the mounting cavity. The potting retainer ring is located between the Hall sensor and the magnetic component. The potting retainer ring, the Hall plate, and the inner wall of the mounting cavity enclose a potting cavity for accommodating the Hall sensor. The potting cavity is filled with potting adhesive for encapsulating the Hall sensor.

[0019] In one embodiment of the present invention, the interior of the mounting cavity is provided with a positioning step for positioning the Hall plate;

[0020] The support base includes a base body and a cover. The drive shaft is rotatably mounted on the base body and the cover via a bearing. A positioning bushing is fitted on the drive shaft, covering the outside of the magnetic component. The positioning bushing contacts and positions itself in contact with the bearing on the base body.

[0021] In one embodiment of the present invention, the transmission assembly further includes a standard rod, the first end of which is used to connect to a medical power handle, and the second end of which is used to connect to the connecting part of the transmission shaft.

[0022] This invention proposes a stability testing fixture for a medical power handle, which achieves efficient speed reduction through a planetary gear transmission structure. Its core principle is based on the meshing transmission of a sun gear, planetary gears, and an internal gear ring. When power is input to the medical power handle, it is first transmitted through the transmission shaft of the transmission assembly, causing the sun gear at the end of the shaft to rotate. Since multiple planetary gears surround and mesh with the sun gear, the rotation of the sun gear drives the planetary gears to rotate around their own axes. Simultaneously, the planetary gears mesh with the internal gear ring in the middle of the reducer housing, causing them to revolve around the sun gear while rotating on their own axes. The revolving motion of the planetary gears is transmitted to one side of the reducer housing via the output shaft, completing the speed reduction process from high-speed input to low-speed output, thus enabling torque testing in response to external loads. Furthermore, the transmission assembly simultaneously detects the speed of the medical power handle at the power input end, achieving coordinated torque and speed testing. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0024] In the attached diagram:

[0025] Figure 1 An exploded isometric view of a stability testing fixture for a medical power handle provided in an embodiment of this utility model.

[0026] Figure 2 This is a side view of the stability testing fixture for a medical power handle provided in one embodiment of the present invention.

[0027] Figure 3 for Figure 2 Sectional view along axis AA;

[0028] Figure 4 This is an exploded front view of the stability testing fixture for a medical power handle provided in one embodiment of the present invention.

[0029] Figure 5 for Figure 4 BB-direction sectional view;

[0030] Figure 6 This is a schematic diagram illustrating the application of the stability testing fixture for the medical power handle provided in one embodiment of the present invention.

[0031] The attached figures are labeled as follows:

[0032] 101, 102, 103, 104, 105, 106, 101, 202, 203, 204, 205, 205, 301, 302, 401, 501, 601, 701, 702, 703, 704, 801, 802, 901, 1001, 1101. Detailed Implementation

[0033] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0035] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0036] Please see Figure 1 , Figure 1 A stability testing fixture for a medical power handle provided in one embodiment of this utility model, such as... Figure 1 As shown, it includes:

[0037] The reducer housing 701 is a cylindrical part with an internal gear ring 702 in the middle, and has a first end 703 and a second end 704 along the axial direction.

[0038] A reducer housing 1001 is installed inside a reducer housing 701. An output shaft 801 is rotatably mounted on the reducer housing 1001. Multiple planetary gears 901 are rotatably mounted on the end of the output shaft 801. In this embodiment, three planetary gears 901 are preferably provided, and all three planetary gears 901 mesh with an internal gear ring 702. The other end of the output shaft 801 is used to connect an external load for torque testing. It should be noted that in this embodiment, the other end of the output shaft 801 can also be unloaded, i.e., it can operate under no-load conditions. In this case, the stability testing fixture only performs speed testing and not torque testing.

[0039] A transmission assembly, installed at the power input end 703, is used for speed testing of the medical power handle. The transmission assembly includes a drive shaft 201 for transmitting power to the medical power handle. One end of the drive shaft 201 has a sun gear 205 that extends into the reducer housing 701 and is coaxial with the internal gear ring 702. Three planetary gears 901 surround the outside of the sun gear 205 and mesh with it. It should be noted that in this embodiment, three planetary gears 901 are preferred, as they allow for smooth power transmission. Furthermore, the number of planetary gears 901 can be two, four, five, or more, depending on the actual application.

[0040] The Hall effect sensor is mounted on the transmission assembly and located on the outer periphery of the transmission shaft 201. The Hall effect sensor is used to test the rotational speed of the transmission shaft 201.

[0041] In this embodiment, a planetary gear mechanism is used as the reduction mechanism at the output end of the torque test of the medical power handle motor. It has the advantages of large reduction ratio, stable transmission and compact structure. The reducer housing 701 serves as both the internal gear ring 702 of the planetary gear mechanism and the support structure connecting the reducer base 1001 and the transmission assembly. It is also radially positioned from the outside to ensure the coaxiality of the power input to the power output. This allows this embodiment to stably, accurately and reliably test the speed and torque of the medical power handle. It has multiple functions, high integration, compact structure and small space occupation.

[0042] For example, refer to Figure 2 , Figure 3 As shown, in this embodiment, the reducer housing 1001 is an annular component, preferably a circular annular component, so that it can be matched and installed with the reducer housing 701 and ensure coaxiality. The reducer housing 1001 is partially installed in the second end 704, and the reducer housing 701, reducer housing 1001, and output shaft 801 are arranged coaxially. This helps to ensure the stability of the test and the accuracy of the test results.

[0043] For example, in this embodiment, the end of the output shaft 801 is integrally formed with a planetary carrier 802, and the planetary gear 901 is rotatably mounted on the planetary carrier 802 by means of a pin.

[0044] For example, in this embodiment, the reducer housing 1001 is provided with a bearing 106 for supporting the output shaft 801, so as to ensure the rotational freedom and rotational stability of the output shaft 801.

[0045] For example, refer to Figure 4 , Figure 5 As shown, in this embodiment, the transmission assembly further includes a support base, which includes a cylindrical seat body 101 and a seat cover 102. The seat body 101 is partially installed in the first end 703. The seat body 101 has an installation cavity 103 inside. The transmission shaft 201 is rotatably coaxially mounted on the support base and passes through the installation cavity 103. The end of the transmission shaft 201 with a sun gear 205 meshes with a planetary gear 901 in the first end 703. The other end of the transmission shaft 201 has a connecting part 204 for connecting to a medical power handle. The connecting part 204 can be a keyway, spline, slotted opening, or other structure for shaft end connection opened at one end of the transmission shaft 201. In this embodiment, the preferred connecting part 204 is a radial slotted opening opened at the end of the transmission shaft 201.

[0046] In this embodiment, the support base serves as the outer housing to support and protect the internal drive shaft 201. The drive shaft 201 transmits the power output from the medical power handle to the planetary gear 901 via the sun gear 205. The planetary gear 901 then transmits the power to the output shaft 801 through its rotation and revolution. The transmission through the planetary gear mechanism increases the torque, enabling the connection of a corresponding load for torque measurement. The support base and drive shaft 201 can maintain coaxiality with the reducer housing 701, reducer base 1001, and output shaft 801 to ensure the stability of power transmission and guarantee the stability and accuracy of the test results. For example, in this embodiment, the Hall component also includes a magnetic element 202 and a Hall plate 301. The magnetic element 202 is disposed on the drive shaft 201 and located within the mounting cavity 103. The Hall plate 301 is mounted on the support base and is at least partially located within the mounting cavity 103. The Hall plate 301 is provided with at least one Hall sensor 302. In this embodiment, three Hall sensors 302 are preferably provided. The Hall sensor 302 extends into the mounting cavity 103 and is located outside the magnetic component 202.

[0047] It is worth noting that in this embodiment, the Hall plate 301 is a circuit board for mounting the Hall sensor 302. The Hall plate 301 has circuitry for transmitting the electrical energy and signals required for the operation of the Hall sensor 302, as well as an interface for connecting wires. By using three Hall sensors 302 evenly distributed around the outside, the pulse signals output by the three Hall sensors 302 can be cross-validated to eliminate errors, significantly improving detection accuracy. It can also determine the direction of rotation of the shaft, enhancing anti-interference and fault tolerance capabilities, and adapting to a wide speed range, meeting the high requirements for reliability and accuracy under different speed conditions.

[0048] In this embodiment, the arrangement of the magnetic component 202, the Hall sensor 302, and the transmission shaft 201 allows for the simultaneous measurement of the output speed of the medical power handle motor at the transmission shaft 201 during power transmission. This enables simultaneous speed measurement under high speed and load conditions to test the stability of the medical power handle under load.

[0049] For example, in this embodiment, the base 101 is provided with a lateral opening 105, which connects to the mounting cavity 103. The portion of the Hall plate 301 located inside the mounting cavity 103 is annular. One end of the Hall plate 301 extends outward from the lateral opening 105 to form a rectangular wire connection portion 204, facilitating the connection of external wires. The lateral opening 105 allows the Hall plate 301 to adopt a flat plate structure, making it convenient for the Hall plate 301 to extend directly outside the support base.

[0050] It is worth noting that, in this embodiment, the transmission assembly also includes a potting retainer ring 401 disposed within the mounting cavity 103. The potting retainer ring 401 is located between the Hall sensor 302 and the magnetic component 202. The potting retainer ring 401, the Hall plate 301, and the inner wall of the mounting cavity 103 enclose a potting cavity to accommodate the Hall sensor 302. The potting cavity is filled with potting compound to encapsulate the Hall sensor 302. In this embodiment, by encapsulating the Hall sensor 302, interference from external environmental factors on the Hall sensor 302 is reduced, thereby ensuring the sensitivity and accuracy of speed measurement under load.

[0051] For example, in this embodiment, the mounting cavity 103 is provided with a positioning step 104 for positioning the Hall plate 301; the support includes a base 101 and a cover 102, and the drive shaft 201 is rotatably mounted on the base 101 and the cover 102 via a bearing 106. A positioning bushing 203 is sleeved on the drive shaft 201, covering the outside of the magnetic component 202, and the positioning bushing 203 contacts and positions itself with the bearing 106 on the base 101. It is worth noting that the positioning bushing 203 and the drive shaft 201 are connected by key connection, pin connection, screw connection, adhesive connection, interference fit, etc., to achieve the positioning of the magnetic component 202, so that the magnetic component 202 is directly positioned to a preset position, thereby enabling the magnetic component 202 and the Hall sensor 302 to be conveniently positioned and aligned.

[0052] It is worth noting that in this embodiment, the magnetic component 202 is a magnetic steel ring or multiple magnetic steel blocks surrounding the transmission shaft 201. Using a magnetic steel ring allows for multi-pole magnetization along the circumference, such as 2 poles, 4 poles, 8 poles, etc. The more poles, the higher the detection accuracy. Adjacent magnetic poles alternate between N and S poles, evenly distributed along the circumference. Thus, when the magnetic steel ring rotates, the Hall sensor 302 alternately detects the N and S pole magnetic fields, thereby outputting periodic high and low level pulses. Alternatively, a structure using multiple magnetic steel blocks distributes multiple magnetic steel blocks around the transmission shaft 201, with adjacent magnetic steel blocks having alternating N and S poles.

[0053] In this embodiment, the Hall sensor 302 and the magnetic component 202 are indirectly positioned by the positioning step 104 and the positioning bushing 203, respectively, so that the two are radially aligned on the transmission shaft 201. This ensures that the Hall effect between the Hall sensor 302 and the magnetic component 202 is stable, and can stably and accurately detect the rotational speed under load.

[0054] For example, refer to Figure 6As shown, this embodiment also includes a standard rod 501. The first end of the standard rod 501 is used to connect to the medical power handle, and the second end is used to connect to the connecting part 204 of the transmission shaft 201. The speed testing fixture for the medical power handle in this embodiment needs to be connected to the output end of the motor of the power handle 601 under test during use. This can be achieved by directly connecting the transmission shaft 201 to the output end of the motor. However, the output ends of different models of the power handle 601 under test have structural differences. Therefore, a standard rod 501 is provided. The standard rod 501 has an end that is directly connected to the transmission shaft 201. The other end of the standard rod 501 can be designed with different connection structures according to different power handle 601 motors under test. Thus, when performing speed testing on different models of power handle 601 motors under test, only the corresponding standard rod 501 needs to be matched to connect the motor to the transmission shaft 201 and complete the power transmission. This allows the speed testing fixture for the medical power handle of this invention to be adaptable to speed testing of different models of medical power handle motors, thus possessing versatility. The speed testing fixture does not need to be repeatedly moved and installed, which reduces the impact of errors caused by repeated installation on the speed test results.

[0055] For example, in application, the output shaft 801 is connected to the load via coupling 1101. The power output from the power handle 601 under test is transmitted to the transmission shaft 201 via the standard rod 501. The transmission shaft 201 transmits the power to the output shaft 801 through the reduction of the sun gear 205, planetary gear 901, internal gear ring 702, and planetary carrier 802. The output shaft 801 drives the load via coupling 1101. During the drive of the load, the rotational speed of the power handle 601 under test is measured at the transmission shaft 201 through the Hall effect between the Hall sensor 302 and the magnetic component 202. By calculating the load, the reduction ratio of the planetary gear mechanism, etc., the torque at the corresponding rotational speed is obtained. The operation stability of the power handle 601 under test under different rotational speeds and torques is evaluated by the rotational speed and torque, thereby facilitating an objective evaluation and feedback of the product performance.

[0056] Furthermore, compared to existing technologies that use speed and torque sensors to directly test the speed and torque of the motor in a medical power handle, this invention integrates Hall effect sensors with planetary gears into a test fixture, enabling high-speed torque testing of motors exceeding 20,000 rpm. Specifically, a planetary gear mechanism is formed by the planetary gears on the output shaft 801, the internal gear ring 702 on the reducer housing 701, and the sun gear 205 on the transmission shaft 201 to reduce power and connect to an external load for torque testing. The even distribution of multiple planetary gears effectively distributes the load, reducing force concentration on individual gears and significantly improving overall operational stability. The overall structure has high coaxiality and high integration of components, significantly reducing the overall size of the fixture. Simultaneously, the compact structure shortens the transmission chain length, reducing error accumulation during transmission. Combining the Hall effect between multiple Hall sensors 302 and the magnetic component 202 on the transmission shaft 201, while responding stably to external loads, it can quickly, accurately, and reliably provide speed feedback, enabling stability testing of the medical power handle motor at high speeds.

[0057] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A stability testing fixture for a medical power handpiece, characterized in that, include: A reducer housing, wherein an internal gear ring is provided inside the reducer housing; A reducer housing is installed inside the reducer housing, and an output shaft is rotatably mounted on the reducer housing. The output shaft is used to connect an external load for torque testing. A planetary assembly includes a planet carrier and planetary gears mounted on the planet carrier, the planet carrier being connected to the output shaft, and the planetary gears meshing with the internal gear ring. A transmission assembly includes a transmission shaft for transmitting power to a medical power handle. The transmission shaft is coaxially arranged with the output shaft, and one end of the transmission shaft is provided with a sun gear. The sun gear extends into the reducer housing and meshes with the planetary gear. A Hall effect sensor is disposed on the transmission assembly and located on the outer periphery of the transmission shaft. The Hall effect sensor is used to test the rotational speed of the transmission shaft.

2. The stability testing fixture for the medical power handpiece according to claim 1, characterized in that: The reducer housing is circular, and the reducer housing and the output shaft are arranged coaxially.

3. The stability testing fixture for the medical power handpiece according to claim 2, characterized in that: The planetary carrier is integrally formed with the end of the output shaft, and the planetary gear is rotatably mounted on the planetary carrier.

4. The stability testing fixture for the medical power handle according to claim 3, characterized in that: The reducer housing is provided with a bearing for supporting the output shaft.

5. The stability testing fixture for the medical power handpiece according to claim 1, characterized in that: The transmission assembly also includes a support base connected to the reducer housing. The transmission shaft is rotatably mounted on the support base. One end of the transmission shaft is provided with the sun gear, and the other end of the transmission shaft is provided with a connecting part for connecting to the medical power handle to be tested.

6. The stability testing fixture for the medical power handpiece according to claim 5, characterized in that: The reducer housing is cylindrical and has a first end and a second end along the axial direction. The support is installed at the first end of the reducer housing, and the reducer base is installed at the second end of the reducer housing.

7. The stability testing fixture for the medical power handpiece according to claim 5, characterized in that: The support base has an internal mounting cavity, through which the drive shaft passes. The Hall assembly also includes a Hall plate and a magnetic element. The magnetic element is disposed on the drive shaft and located within the mounting cavity. The Hall plate is mounted on the support base and is at least partially located within the mounting cavity. At least one Hall sensor is disposed on the Hall plate. The Hall sensor extends into the mounting cavity and is located outside the magnetic element.

8. The stability testing fixture for the medical power handpiece according to claim 7, characterized in that: The transmission assembly also includes a potting retainer ring disposed in the mounting cavity. The potting retainer ring is located between the Hall sensor and the magnetic component. The potting retainer ring, the Hall plate, and the inner wall of the mounting cavity enclose a potting cavity to accommodate the Hall sensor. The potting cavity is filled with potting adhesive to encapsulate the Hall sensor.

9. The stability testing fixture for the medical power handpiece according to claim 8, characterized in that: The mounting cavity is provided with a positioning step for positioning the Hall plate; the support base includes a base body and a cover, the drive shaft is rotatably mounted on the base body and the cover via a bearing, and a positioning bushing covering the outside of the magnetic component is sleeved on the drive shaft, the positioning bushing being in contact with the bearing on the base body for positioning.

10. The stability testing fixture for the medical power handle according to claim 9, characterized in that: The transmission assembly also includes a standard rod, the first end of which is used to connect to a medical power handle, and the second end of which is used to connect to the connecting part of the transmission shaft.

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