A grinding device

Abstract

The application discloses a grinding device, comprising a motor, a handle and a working head, the handle comprising an outer shell, an adjusting mechanism, a first sleeve and a second sleeve; the adjusting mechanism is designed as an axial rotating ball to fasten or release the working head; the inner surface of the first sleeve is provided with a conical surface corresponding to a wave sonar, and the proximal end is provided with a matching part extending in the radial direction; when the working head is not installed, the matching part continuously contacts the passive element to prevent idling through friction. The grinding device provides a one-handed adjusting mechanism, which can fasten or loosen the working head through double-finger screwing, and the structure design conforms to the use habit of operators and is easy and labor-saving. The shell is designed to be compact, and the rotating loss and noise of the internal components are reduced as much as possible through bearing cooperation.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically to a grinding apparatus. Background Technology

[0002] Medical surgical power handpieces are mainly used in surgical settings such as spinal surgery, orthopedics, and neurosurgery. They utilize a high-speed motor to drive a rotating chuck, which clamps different working heads to perform functions such as grinding, planing, and boring. Most existing products include a high-speed motor, a handpiece, and working heads. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a grinding device that is easy to operate, has stable clamping, and prevents the motor from running dry.

[0004] Technical Solution: To achieve the above-mentioned objective, the present invention provides a grinding device comprising a motor, a handle, and a replaceable working head. The handle includes a housing, an adjustment mechanism, a first sleeve, and a second sleeve. The adjustment mechanism includes an active component mounted on the housing and a passive component located within the inner cavity of the housing and capable of axial movement. The second sleeve includes a receiving cavity for mounting the working head. A plurality of holes for accommodating balls are formed in the side wall of the second sleeve. A transmission end connected to the motor is located at the proximal end of the second sleeve. The first sleeve is fitted over the second sleeve, and the outer diameter of the second sleeve is smaller than the inner diameter of the first sleeve. The inner surface of the first sleeve includes at least one conical or inclined surface corresponding to a ball. The first sleeve also includes a mating portion extending radially, which continuously abuts against the passive component when the working head is not mounted.

[0005] The working head described in this invention refers to a slender rod-shaped part used to perform functions such as grinding, planing, and boring, including but not limited to grinding heads and drill bits.

[0006] The grinding apparatus provided by this invention should at least achieve the following functions: when a working head is installed, the working head can be secured by moving the first sleeve towards the distal end using the adjusting mechanism; the working head can be released by moving the first sleeve towards the proximal end using the adjusting mechanism. When no working head is installed, the first sleeve will move to its distal limit distance, using the frictional force against other structures to prevent the motor from running idle.

[0007] The adjustment mechanism described in this invention is generally operable from the outer casing to adjust the axial relative positions of internal parts, thereby enabling the installation / removal of the working head and the fastening of the working head. Therefore, the operation of the driving member can be arbitrarily modified according to existing technology, and its movement includes, but is not limited to, any combination of one or more along the axial, radial, and circumferential directions. For example, along the axial direction, a push rod, sliding sleeve, or gear can be used; along the radial direction, a pusher with a wedge-shaped or spherical surface can be used; and along the circumferential direction, it is mainly based on a thread or a structure similar to a threaded connection.

[0008] In a preferred embodiment of the present invention, the present invention employs a method in which the driving member moves circumferentially, causing the driven member to move axially within the outer casing. The driving member includes an outer sleeve that rotates circumferentially, with at least one axial guide groove on its inner wall. The outer casing also includes an inner casing, with at least one helical guide hole on its side wall for accommodating a ball. The driven member is a collar with an annular groove on its outer wall. The portion of the ball extending beyond the outer wall of the inner casing is embedded in the axial guide groove, and the portion extending beyond the inner wall of the inner casing is embedded in the annular groove. The length of the axial guide groove should not be less than the axial length of the helical guide hole.

[0009] Furthermore, the helical guide hole extends counterclockwise towards the distal end. When the outer sleeve rotates clockwise, the balls inside the helical guide hole move along the helical trajectory towards the distal end, causing the collar to move towards the distal end for securing the assembled working head. Correspondingly, when the outer sleeve rotates counterclockwise, it causes the collar to move towards the distal end to facilitate the removal of the working head.

[0010] Preferably, there are 1-4 helical guide holes. Those skilled in the art can improve the shape and number of helical guide holes according to product size and desired lead, all of which are within the protection scope of this invention. The design of the helical guide holes and the ball bearings is preferably arranged in a symmetrical manner with respect to the central axis to ensure stable support / thrust for the external sleeve / ring.

[0011] This invention further optimizes the structure to provide an effective function in preventing motor idling. When the working part is not assembled, the mating portion of the first sleeve continuously abuts against the driven part, achieving anti-idling through friction between the two. The mating portion can be located at any position on the first sleeve and abut against any position on the driven part. As a preferred embodiment of the invention, the second sleeve is provided with a first spring that continuously applies pressure to the first sleeve in the distal direction. The mating portion is a structure formed by the radial extension of the first sleeve, comprising at least one complete or partial plane, conical surface, or spherical surface. More preferably, the shape of the mating portion is designed as a convex ring formed on the proximal end face of the first sleeve. The first spring abuts against the mating portion.

[0012] The first spring is assembled onto the second sleeve. Preferably, the first spring is tightly wound around the second sleeve and rotates together with the second sleeve. More preferably, the first spring has a rectangular cross-section.

[0013] Based on the above technical solutions, those skilled in the art can further improve the usability of the product by adding at least one spring at any position to achieve the reset of the adjustment mechanism or reduce the resistance received by the adjustment mechanism during reset. As a preferred embodiment of the present invention, the distal end of the collar is provided with a counter-spring that is continuously in a compressed state.

[0014] This invention further requires, from an overall design perspective, to minimize the noise and frictional heat generated by the second sleeve during high-speed rotation. The front and rear portions of the second sleeve each include a bearing. Furthermore, the second sleeve contains only two bearings that mate with it, located at the front and rear portions respectively. Based on this design, the outer shell and inner shell are connected by threads to form a single unit, and the diameter of its inner cavity in any cross-section is larger than the maximum outer diameter of either the first or second sleeve. Except for the bearing mating locations, the second sleeve maintains sufficient space in all other positions to reduce friction.

[0015] The inner surface of the first sleeve of the present invention includes at least one conical or inclined surface corresponding to a wavelet, wherein the conical or inclined surface can be located at any position on the inner surface of the first sleeve. As a preferred embodiment of the present invention, the distal inner wall of the first sleeve has a conical surface, the diameter of which gradually increases towards the distal end.

[0016] The wavelet shape described in this invention includes, but is not limited to, any one or more combinations of spheres, cylinders, prisms, and tetrahedrons. Preferably, the outer surface of the wavelet has an outwardly protruding curved surface or inclined surface to better match the conical surface or inclined surface of the first sleeve.

[0017] In the most optimal embodiment of the present invention, the wavelet is a combination of a sphere and a cylinder. The maximum height of the wavelet is h1, the sidewall thickness of the second sleeve near the hole is h2, and the radius difference of the conical surfaces of the first sleeve is ΔR. The relationship between these parameters is as follows:

[0018] 0

[0019] Based on the above formula, when the working head is assembled inside the second sleeve, one side of the wavelet abuts against the side wall of the working head, while a portion of the structure on the other side is exposed outside the second sleeve. The height of the exposed portion of the structure should be limited within a certain range so that when the first sleeve moves axially towards the distal end, it abuts against the wavelet, thereby securing the working head.

[0020] Furthermore, the second sleeve has 2-6 holes, and correspondingly, the number of wavelets is also 2-6. As the optimal solution of the present invention, the number of holes and wavelets is each set to 3, and they are centrally symmetrically distributed along the axial direction.

[0021] The grinding device provided by this invention can be adaptively modified in its overall contour shape according to different usage scenarios, including but not limited to minimally invasive surgical work channels or open surgical areas, and specific surgical environments such as spinal surgery, orthopedics, neurosurgery, and otolaryngology. A representative improvement is to give the device at least one bend. As a preferred embodiment of this invention, the handle has a bend near its proximal end, and a transmission intermediate component is provided in the housing at the proximal end of the bend. The transmission intermediate component is respectively connected to the proximal end of the motor and the second sleeve.

[0022] For the aforementioned transmission connections related to intermediate components, and the transmission connections where the second transmission component directly engages with the motor, the transmission connections are any one or more combinations including but not limited to keyway connections, flange connections, gear connections, and pin connections.

[0023] The guide sleeve can be further designed with several bearings to achieve a speed of 80,000 RPM, effectively reducing vibration, noise and radial runout.

[0024] Unless otherwise specified, the term "proximal end" in this invention refers to the end closer to the surgeon's operation or the end where the motor is located; the term "distal end" in contrast to "proximal end" refers to the end farther from the surgeon's operation or the end where the surgical area is located.

[0025] ​Beneficial effects: The grinding device described in this invention can be assembled with any working head as needed. The device provides a one-handed adjustment mechanism, allowing for tightening / loosening of the working head simply by turning it with two fingers. The adjustment mechanism employs a circumferential rotating sleeve and ball bearing design, conforming to the operator's usage habits and requiring little effort. The device's housing design is compact, and the bearing assembly minimizes rotational losses and noise from internal components. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of Example 1;

[0027] Figure 2 This is a schematic diagram of the curved handle;

[0028] Figure 3 This is a schematic diagram of the slender handle;

[0029] Figure 4 This is an exploded view of the active component and the inner shell;

[0030] Figure 5 This is a partial schematic diagram;

[0031] Figure 6 It is a longitudinal section view;

[0032] Figure 7 This is a structural diagram of the first sleeve, the second sleeve, the collar, the spring, and the bearing;

[0033] Figure 8 This is a cross-sectional schematic diagram. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] Please combine Figures 1 to 3 As shown, the grinding device provided in this embodiment includes a motor A and a handle B. A transmission gear is mounted on the motor output shaft, which, after assembly with the handle, achieves transmission engagement. A working head, such as a grinding head or drill bit, can be mounted on the distal end of the handle. The handle can be designed in various styles depending on the application scenario; it can be designed with at least one bend at the proximal end, and / or with guide sleeves of different lengths, diameters, and free end designs at the distal end. The main structure of the handle of this invention will be described below. Free combinations of the aforementioned solutions to obtain the desired grinding device without departing from the principle of this invention are all within the protection scope of this invention.

[0036] Please combine Figure 1 , Figures 4 to 8As shown, the handle B includes: outer shell 120, inner shell 140, adjustment mechanism 200, first sleeve 320, second sleeve 340, square spring 362, counteracting spring 364, front bearing 382, ​​rear bearing 384, wave spring 400, rear shell 520, transmission intermediate component 540, and guide sleeve 600.

[0037] The guide sleeve 600 includes a guide seat 620 and a long rod 640, and optionally one or more small bearings are provided in the guide seat.

[0038] The outer shell 120 is a hollow cylindrical tube, designed with a diameter suitable for easy gripping. The main body of the inner shell 140 is a cylindrical tube 144. The front end of the tube 144 has a front threaded connector 142 that connects to the guide seat 620, and the rear end of the tube 144 has a rear threaded connector 146 that connects to the outer shell 120. Two helical guide holes 148 extending counterclockwise towards the distal end are provided on the side wall of the tube 144, and are centrally symmetrically distributed with respect to the central axis. The proximal end of the outer shell 120 is threadedly connected to the rear shell 520, which has a bend and houses a transmission intermediate component 540.

[0039] The adjusting mechanism 200 consists of an outer sleeve 220, four balls (not shown in the figure), and a collar 260. The outer sleeve 220, together with the outer shell 120, inner shell 140, rear shell 520, and guide seat 620, forms the complete housing of the handle. The outer sleeve 220 is located outside the inner shell 140, and its outer wall has a hexagonal profile 224, while its inner wall has four axial guide grooves 222. The collar 260 is located inside the inner shell 140, and its outer wall has an annular groove 262 circumferentially formed. The aforementioned axial guide grooves 222, helical guide holes 148, and annular grooves 262 are positioned correspondingly to form a guide groove for the balls to move along a specific helical trajectory: the portion of the balls extending beyond the outer wall of the inner shell 140 is embedded in the axial guide groove 222, and the portion extending beyond the inner wall of the inner shell 140 is embedded in the annular groove 262. When the outer sleeve rotates clockwise, the balls in the helical guide hole move along the helical trajectory towards the distal end, causing the collar to move towards the distal end to fasten the assembled working head. Correspondingly, when the outer sleeve rotates counterclockwise, it causes the collar to move towards the distal end to remove the working head.

[0040] The first sleeve 320 is approximately cylindrical in shape, with an inner conical surface 322 at its front end and an annular protrusion 324 extending radially outward at its rear end.

[0041] The second sleeve 340 is also approximately cylindrical in shape and is located inside the first sleeve 320. The main body of the second sleeve 340 is a rotating body 342, the distal end of which is threadedly connected to the guide seat 620, and the proximal end is fitted with a rear gear 344 via a pin. The inner cavity of the front section of the second sleeve forms a receiving cavity 346 for accommodating the working head, and it opens at the distal end. Three holes 348 are provided on the side wall of the rotating body 342 corresponding to the receiving cavity 346. Each hole 348 contains a wavelet 400, which has a cylindrical body 420 for clamping the working head and a blunt rounded portion 440 exposed outside the second sleeve. A front bearing 382 is assembled at the proximal end of the second sleeve 340, and a rear bearing 384 is assembled at the rear end, both assembled into the inner cavity of the handle housing. The diameter of the inner cavity of the housing in any cross-section is larger than the maximum outer diameter of either the first or second sleeve. The surface of the second sleeve 340 is also fitted with a square spring 362 and a counteracting spring 364, with the two springs distributed on the far end face and the near end face of the collar 260, respectively.

[0042] The maximum height of the wavelet is h1, the sidewall thickness of the second sleeve near the hole is h2, and the radius difference of the first sleeve's conical surface is ΔR. The relationship between these parameters is:

[0043] 0

[0044] Based on the above formula, when the working head is assembled inside the second sleeve, one side of the ball bearing abuts against the side wall of the working head, while a portion of the structure on the other side is exposed outside the second sleeve. The height of the exposed portion of the structure should be limited within a certain range so that when the first sleeve moves axially towards the distal end, it abuts against the ball bearing, thus securing the working head.

[0045] The transmission intermediate component 540 is located inside the rear housing 520 and includes an intermediate front gear 542, an intermediate bearing 544, and an intermediate rear gear 546, which are fixed together by a pin. The intermediate front gear 542 meshes with the rear end gear 344 of the second sleeve, and the intermediate rear gear 546 meshes with the transmission gear on the output shaft of motor A.

[0046] The aforementioned meshing gears can be standard or non-standard gears. The gears provided in this embodiment are all designed to face each other, which has the advantage of being able to self-correct and automatically meshing even when inserted at any angle. In addition, traditional slotted grooves can also be used, but this can lead to problems such as difficulty in position calibration and jamming.

[0047] ​When the working head is installed, the first sleeve can be tightened by moving it to the distal end using the adjustment mechanism; the tightening of the working head can be released by moving it to the proximal end using the adjustment mechanism. When the working head is not installed, the first sleeve will move to its distal limit distance. At this time, the annular protrusion 324 of the first sleeve abuts against the proximal end face of the collar 260, and the friction prevents the motor from running dry.

[0048] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A grinding device, comprising a motor, a handle, and a replaceable working head, characterized in that: The handle includes an outer shell, an adjustment mechanism, a first sleeve, and a second sleeve; The adjustment mechanism includes an active component mounted on the outer shell and a passive component located in the inner cavity of the outer shell that can move axially. The second sleeve includes a receiving cavity for mounting the working head, and the side wall of the second sleeve has several holes for accommodating the wavelets. The proximal end of the second sleeve is provided with a transmission end that is connected to the motor drive. The first sleeve is fitted over the second sleeve, and the outer diameter of the second sleeve is smaller than the inner diameter of the first sleeve. The inner surface of the first sleeve includes at least one conical or inclined surface corresponding to the wavelet. The first sleeve also includes a mating portion extending radially, which continuously abuts against the driven member when the working head is not installed; The active component includes an outer sleeve that rotates circumferentially, and the inner wall of the outer sleeve is provided with at least one axial guide groove. The outer shell also includes an inner shell, and the side wall of the inner shell has at least one helical guide hole for accommodating a ball. The passive component is a collar with an annular groove on its outer wall; The portion of the ball extending beyond the outer wall of the inner housing is embedded in the axial guide groove, and the portion of the ball extending beyond the inner wall of the inner housing is embedded in the annular groove; The spiral guide hole extends counterclockwise toward the distal end; The second sleeve is provided with a first spring that continuously applies pressure to the first sleeve in the distal direction; The first sleeve also includes a mating part that extends radially. When the working head is not installed, the mating part continuously abuts against the driven member. When the working head is not installed, the first sleeve will move to the far end limit distance and use the annular protrusion of the first sleeve to abut against the near end face of the collar to prevent the motor from running dry under the action of friction. The first spring abuts against the mating part, and the distal end of the collar is provided with a counter-spring that is continuously in a compressed state.

2. A grinding device according to claim 1, characterized in that: The front and rear portions of the second sleeve each include a bearing.

3. A grinding device according to claim 1, characterized in that: The distal inner wall of the first sleeve has a conical surface, the diameter of which gradually increases toward the distal end.

4. A grinding device according to claim 3, characterized in that: The outer surface of the wavelet has an outwardly protruding curved surface or inclined surface; the maximum height of the wavelet is h1, the sidewall thickness of the second sleeve near the hole is h2, the radius difference of the conical surface of the first sleeve is ΔR, and 0 < h1 - h2 < ΔR.

5. A grinding device according to claim 1, characterized in that: The handle has a bend near its proximal end, and a transmission intermediate component is located near the proximal end of the bend within the housing. The transmission intermediate component is connected to the proximal end of the motor and the second sleeve respectively.

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