Surgical abrasive drill

Abstract

The invention discloses a surgical abrasive drill, which belongs to the technical field of medical instruments and specifically comprises a machine element and at least one connecting sleeve, a grinding head rod with a grinding head arranged at the end part is arranged in the connecting sleeve in a penetrating manner, and a groove is circumferentially formed in the nearby area of one end, far away from the grinding head, of the grinding head rod; the end, away from the grinding head, of the grinding head rod is symmetrically cut along the two sides of the axis to form a clamping section with a platform, the machine element comprises a machine element body which is in the form of a plurality of coaxial cylinders with different diameters and can rotate, and the machine element body comprises a front end section, a middle section and a tail end section. A long shaft hole matched with the outer diameter of the grinding head rod is formed in the front end section in a penetrating mode and extends to the clamping groove, positioning holes corresponding to the groove in the circumferential direction are formed in the middle section, and balls are arranged in the positioning holes. The invention provides a structure which rotates coaxially and facilitates installation and replacement of a grinding head rod.

Description

Technical Field

[0001] The invention relates to a medical device, in particular to a surgical grinding drill, which has a machine element body in the form of multiple coaxial cylinders with different diameters and capable of rotating, and provides a structure for coaxial rotation and convenient installation and replacement of a grinding head rod. Background Art

[0002] Surgical burs, also known as grinding drills, are mainly used in clinical surgeries that require cutting or grinding, such as orthopedics and brain surgery. Avoiding axis deviation is an important guarantee for the performance of the bur. During high-speed rotation, even a small axis deviation will affect its service life. Therefore, it is necessary to improve the installation method and coaxial rotation of the bur rod. Summary of the invention

[0003] The main purpose of the present invention is to provide a structure that can rotate coaxially and is convenient for installing and replacing a grinding head rod, thereby improving the working stability and service life of the grinding head drill.

[0004] To achieve the above-mentioned purpose, the present invention provides a surgical bur, which comprises a machine element and at least one connecting sleeve, wherein a grinding head rod with a grinding head arranged at the end thereof is passed through the connecting sleeve, wherein the grinding head rod is a cylindrical structure, and a groove is circumferentially provided in the vicinity of one end of the grinding head rod away from the grinding head, and the end of the grinding head rod away from the grinding head is symmetrically cut along both sides of the axis to form a clamping section with a platform, wherein the machine element comprises a machine element body which is configured to be rotatable and has a coaxial cylindrical form with multiple sections of different diameters, wherein the machine element body comprises a front end section and a rear end section for assembling bearings, and an intermediate section coaxially arranged between the front end section and the rear end section, wherein a clamping groove matching the clamping section is axially provided on the intermediate section, a long axis hole matching the outer diameter of the grinding head rod is provided through the front end section and extends to the clamping groove, and a positioning hole is circumferentially provided on the intermediate section corresponding to the groove, and a ball is arranged in the positioning hole.

[0005] Preferably, the at least one connecting sleeve is connected via a threaded structure, and a bearing matching the outer diameter of the grinding head rod is arranged inside the connecting sleeve.

[0006] Preferably, the diameter of the front end section is equal to the diameter of the rear end section.

[0007] Preferably, the number of the positioning holes is 3, 4 or 6.

[0008] Preferably, a flange for preventing the ball from falling off is provided in the positioning hole near the grinding head rod side.

[0009] Preferably, the diameter of the ball is 1.2 to 1.5 times the thickness of the wall of the middle section.

[0010] Preferably, the groove has two upper and lower lateral surfaces that are inclined to each other in a cone angle along the radial direction of the grinding head rod, and the cone angle ranges from 60° to 120°.

[0011] Preferably, the machine element also includes a long-axis sleeve coaxially arranged on the outside of the middle section of the machine element body and surrounding the ball, the long-axis sleeve can slide axially along the middle section, the long-axis sleeve is provided with a wedge-shaped cut corresponding to the section surrounding the ball, and the wedge-shaped cut is coaxial with the long-axis sleeve.

[0012] Preferably, a horizontal end is provided at the end of the wedge-shaped cutout, and an inner diameter of the horizontal end is larger than an outer diameter of the middle section.

[0013] Preferably, the gap between the horizontal end and the wall of the middle section and the thickness of the wall can completely accommodate the ball.

[0014] The surgical grinding drill proposed in the present application is constructed by constructing a machine element body that can perform rotational motion in the form of multiple coaxial cylinders with different diameters. Long axis holes, slots and positioning holes are arranged on the machine element body. Coaxial rotation is achieved through bearing cooperation, and the grinding head rod is easy to install and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is an overall stereoscopic diagram of the surgical burr involved in the present invention.

[0016] Figure 2 It is a perspective view of a surgical burr according to the present invention.

[0017] Figure 3 It is a cross-sectional view of the connecting sleeve involved in the present invention.

[0018] Figure 4 It is a stereoscopic view of the grinding head rod involved in the present invention.

[0019] Figure 5 It is a partial cross-sectional view of the surgical burr involved in the present invention.

[0020] Figure 6 It is a three-dimensional view of the machine element body involved in the present invention.

[0021] Figure 7 It is a partial cross-sectional view of the surgical burr involved in the present invention.

[0022] Figure 8 yes Figure 7 A is an enlarged view of the middle image.

[0023] Fig. 9 It is a partial cross-sectional view of the surgical burr involved in the present invention.

[0024] Figure Number and Name:

[0025] 10. Medical devices;

[0026] 12. A surgical burr;

[0027] 14. Shell;

[0028] 16. Driving motor;

[0029] 18. Transmission device;

[0030] 20. Machine components;

[0031] 201. Machine component body;

[0032] 2011, front end section; 2012, rear end section; 2013, middle section; 20131, slot; 20132, long axis hole; 20133, positioning hole; 20133a, flange; 20134, wall; 2014, stop convex;

[0033] 202. Bearings;

[0034] 203, ball bearing;

[0035] 204, long shaft sleeve; 2041, section; 2042, wedge-shaped cut; 2043, horizontal end; 2044, baffle

[0036] 22. Connecting sleeve;

[0037] 221, sleeve body; 222, internal thread; 223, connecting piece; 224, external thread;

[0038] 24. Grinding head rod;

[0039] 241, groove; 2411, lateral surface; 2412, cone angle; 2413, depth;

[0040] 242. Blocking Section

[0041] 26. Grinding head;

[0042] 28. Bearings;

[0043] 30. longitudinal center axis;

[0044] R1, the outer inner diameter of the sleeve body;

[0045] R2, inner diameter of the sleeve body;

[0046] R3, outer diameter of the connecting piece;

[0047] R4, inner diameter of the connecting piece;

[0048] R5, inner diameter of the bearing;

[0049] R6, diameter;

[0050] D1, thickness;

[0051] W1. Spring.

[0052] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure more clear, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure.

[0054] Figure 1 Schematically shown in FIG. 1 is an embodiment of a medical device, which is designated as a whole by the reference numeral 10 , of a surgical bur 12 .

[0055] The medical device 10 includes a housing 14 used as a handle, and a drive motor 16 is disposed in the housing 14. An energy storage power source, including a solid, semi-solid or liquid energy storage medium such as a lithium ion battery or a sodium ion battery, can be selectively used to provide an operating voltage to the drive motor 16 independently of a power transmission mains, or to provide an operating voltage to the drive motor 16 using a power transmission mains or using a power transmission line after conversion by a switching power supply.

[0056] The driving motor 16 can be a DC motor, a brushless motor, a magnetic levitation motor or other drivers that can provide driving force.

[0057] The transmission device 18 is coupled to the drive shaft of the drive motor 16 , and the machine element 20 is coupled to the transmission device 18 . Optionally, the machine element 20 may also be directly coupled to the drive shaft of the drive motor 16 .

[0058] The machine element 20 further comprises, at its end remote from the transmission 18 , a coupling sleeve 22 which is detachably coupled to the machine element 20 .

[0059] like Figure 1 and Figure 2 As shown, a grinding head rod 24 with a grinding head 26 at the end is inserted into the connecting sleeve 22, and the grinding head 26 has lines or tooth grooves. The connecting sleeve 22 can be provided with multiple sections, which are quickly connected through a threaded structure, and a bearing 28 is provided in the inner end area of ​​the connecting sleeve 22, so that when the grinding head rod 24 rotates at a high speed, it can avoid friction between the grinding head rod 24 and the inner wall of the connecting sleeve 22, and at the same time avoid centrifugal rotation of the grinding head rod 24, which reduces the performance of the equipment.

[0060] As Figure 2 and Figure 3 shown, internal threads 222 are provided at both ends of the coupling sleeve 22 on the sleeve body 221, and the outer diameter R1 of the outer side of the sleeve body 221 is formed. The inner diameter R2 of the inner side of the sleeve body 221 is smaller than the outer diameter R1 of the outer side of the sleeve body 221 (i.e., R2 < R1). When a plurality of coupling sleeves 22 are provided, the coupling sleeves 22 are connected by a connector 223 having an external thread 224. The external thread 224 cooperates with the internal thread 222 on the sleeve body 221. The outer diameter R3 of the connector 223 matches the outer diameter R1 of the sleeve body 221, and the inner diameter R4 of the connector 223 is equivalent to the inner diameter R2 of the sleeve body 221. The bearing 28 is provided at the outer diameter of the sleeve body 221 and is positioned and fixed by the connector 223. Among them, the inner diameter R5 of the bearing is smaller than the inner diameter R2 of the sleeve body 221 and also smaller than the inner diameter R4 of the connector 223, and matches the diameter of the grinding head rod 24.

[0061] Please refer to Figure 4 and Figure 5 , the grinding head rod 24 is of a cylindrical structure, and a groove 241 is circumferentially provided in a vicinity area at one end far from the grinding head 26. One end of the grinding head rod 24 far from the grinding head 26 is symmetrically cut on both sides along the axis to form a clamping section 242 having a platform. The grinding head rod 24 defines a longitudinal central axis 30.

[0062] When the machine element 20 is parallel to the longitudinal central axis 30 and remains concentric, the machine element body 201 of the machine element 20 performs a rotational movement through a drive motor 16 connected to the transmission device 18.

[0063] In order to ensure coaxial rotation of the machine element body 201 and the grinding head rod 24, the machine element body 201 is configured in the form of a coaxial cylinder with multiple different diameters. More specifically, in combination with Figure 5 , Figure 6 and Figure 7 , it includes a front end section 2011 and a tail end section 2012 for assembling the bearing 202. The front end section 2011 and the tail end section 2012 have the same diameter, which is convenient for assembling the same type of bearing 202.

[0064] An intermediate section 2013 with a diameter larger than that of the front section 2011 or the rear section 2012 is coaxially arranged between the front section 2011 and the rear section 2012, and a groove 20131 matching the positioning section 242 of the grinding head rod 24 is arranged at the middle position of the intermediate section 2013 along the direction of the longitudinal center axis 30, and a long axis hole 20132 matching the outer diameter of the grinding head rod 24 is formed through the front section 2011 and extends to the groove 20131 of the intermediate section 2013, and a positioning hole 20133 is circumferentially arranged on the intermediate section 2013 corresponding to the groove 241 on the grinding head rod 24, and a ball 203 is arranged in the positioning hole 20133.

[0065] The positioning holes 20133 on the middle section 2013 are uniformly distributed in the circumferential direction, and the number of the positioning holes 20133 is 3, 4, 6 or more, preferably 3 or 4.

[0066] The ball 203 has a diameter R6, and the diameter R6 of the ball 203 is greater than the thickness D1 of the wall 20134 of the middle section 2013. Preferably, R6 is equal to 1.2 to 1.5 times the thickness D1.

[0067] A flange 20133a is provided in the positioning hole 20133 near the grinding head rod 24, and the flange 20133a is used to prevent the ball 203 from escaping from the radial direction of the machine element body 201 and entering the long axis hole 20132 (see FIG. Figure 8 ).

[0068] The groove 241 on the grinding head rod 24 has two upper and lower transverse surfaces 2411, which are used to facilitate the ball 203 to escape from the groove 241 when installing or replacing the grinding head rod 24. The two transverse surfaces 2411 are close to each other in the radial direction of the grinding head rod 24 and are inclined to each other in the form of a cone angle 2412. The range of the cone angle 2412 is between 60° and 120°.

[0069] The groove 241 on the grinding head rod 24 has a depth 2413, and the depth 2413 of the groove 241 is closely related to the taper 2412 of the two lateral surfaces 2411 (the width of the groove remains fixed). When the ball 203 is assembled with the groove 241, the point on the spherical surface of the ball 203 contacts the two lateral surfaces 2411 on the groove 241. When the taper 2412 selects a larger angle, the tangent point (contact point) between the two lateral surfaces 2411 and the ball 204 moves downward, that is, the length of the secant line on the cross-sectional view decreases. Correspondingly, the length of the line perpendicular to the secant line and the extension line passing through the center of the circle to the surface of the ball 204 decreases, and the depth 2413 of the groove 241 decreases. As a result, it is ensured that the ball 204 is easier to break away from the groove 241, which is convenient for installing and replacing the grinding head rod. In addition, the processing of the groove 241 with a smaller depth 2413 can avoid reducing the strength of the grinding head rod 24.

[0070] See also Fig. 9 The machine element 20 further includes a long shaft sleeve 204, which is coaxially arranged with the longitudinal center axis 30 outside the middle section 2013 of the machine element body 201 and surrounds the ball 203. The long shaft sleeve 204 can slide axially along the middle section 2013 of the machine element body 201, and the long shaft sleeve 204 is provided with a wedge-shaped cutout 2042 corresponding to the section 2041 surrounding the ball 203. The wedge-shaped cutout 2042 is coaxial with the long shaft sleeve 204, and a horizontal end 2043 is provided at the end of the wedge-shaped cutout 2042. At this time, the inner diameter of the horizontal end 2043 is greater than the outer diameter of the middle section 2013. More specifically, the gap between the horizontal end 2043 and the wall 20134 of the middle section 2013 plus the thickness D1 of the wall 20134 can completely accommodate the ball 203 with a diameter of R6 (dashed line in the figure). The above-mentioned manner is coordinated with each other so that the balls 203 can roll along the radial direction of the machine element body 201 and escape from the grooves 241 on the grinding head rod 24 when the grinding head rod 24 is pulled out.

[0071] A blocking portion 2044 is provided on one end of the long shaft sleeve 204 away from the section 2041, which cooperates with the spring W1 sleeved on the middle section 2013 to apply an axial force to the long shaft sleeve 204. Under the action of the axial force, the wedge-shaped cutout 2042 generates radial pressure on the ball 203, forcing the ball 203 to enter the groove 241 of the grinding head rod 24, thereby achieving locking and coaxial fixation of the grinding head rod 24.

[0072] Please see again Figure 7 The spring W1 is sleeved on the middle section 2013 and abuts against the stop bulge 2014 provided between the middle section 2013 and the tail section 2012 , and the other end of the spring W1 abuts against the blocking portion 2044 on the long shaft sleeve 204 .

[0073] It should be noted that the transmission device 18 is connected to the tail section 2012 of the machine element body 201, and the specific connection method includes hinged connection, clamping connection and other forms, and the connection method is not limited.

Claims

1. A surgical bur, characterized in that: The surgical burr (12) comprises a machine element (20) and at least one connecting sleeve (22), wherein a grinding head rod (24) having a grinding head (26) at the end thereof is inserted into the connecting sleeve (22), wherein the grinding head rod (24) is a cylindrical structure, wherein a groove (241) is circumferentially provided in the vicinity of an end of the grinding head rod (24) away from the grinding head (26), wherein an end of the grinding head rod (24) away from the grinding head (26) is symmetrically cut along both sides of an axis to form a locking section (242) having a platform, wherein the machine element (20) comprises a machine element body (201) which is configured in the form of a coaxial cylinder having multiple sections of different diameters and can perform rotational motion, wherein the machine element body (201) comprises a plurality of coaxial cylinders having ... A front end section (2011) and a rear end section (2012) for assembling a bearing, and a middle section (2013) coaxially arranged between the front end section (2011) and the rear end section (2012); a groove (20131) matching the positioning section (242) is axially arranged on the middle section (2013); a long axis hole (20132) matching the outer diameter of the grinding head rod (24) is provided through the front end section (2011) and extends to the groove (20131); a positioning hole (20133) is circumferentially arranged on the middle section (2013) corresponding to the groove (241); a ball (203) is arranged in the positioning hole (20133).

2. The surgical burr according to claim 1, characterized in that: The at least one connecting sleeve (22) is connected via a threaded structure, and a bearing matching the outer diameter of the grinding head rod (24) is arranged inside the connecting sleeve (22).

3. The surgical burr according to claim 2, characterized in that: The diameter of the front end section (2011) is equal to the diameter of the rear end section (2012).

4. The surgical burr according to claim 3, characterized in that: The number of the positioning holes (20133) is 3, 4 or 6.

5. The surgical burr according to claim 4, characterized in that: A flange (20133a) is provided in the positioning hole (20133) near the grinding head rod (24) to prevent the ball (203) from falling off.

6. The surgical burr according to claim 5, characterized in that: The diameter of the ball (203) is 1.2 to 1.5 times the thickness of the wall (20134) of the middle section (2013).

7. The surgical burr according to claim 1, characterized in that: The groove (241) has two upper and lower transverse surfaces (2411) that are close to each other and inclined at a cone angle (2412) along the radial direction of the grinding head rod (24), and the cone angle (2412) ranges from 60° to 120°.

8. The surgical burr according to any one of claims 1 to 7, characterized in that: The machine element (20) further comprises a long shaft sleeve (204) coaxially arranged outside the middle section (2013) of the machine element body (201) and surrounding the ball (203); the long shaft sleeve (204) can slide axially along the middle section (2013); the long shaft sleeve (204) is provided with a wedge-shaped cutout (2042) corresponding to the section (2041) surrounding the ball (203); the wedge-shaped cutout (2042) is coaxial with the long shaft sleeve (204).

9. The surgical burr according to claim 8, characterized in that: A horizontal end (2043) is provided at the end of the wedge-shaped cutout (2042), and the inner diameter of the horizontal end (2043) is greater than the outer diameter of the middle section (2013).

10. The surgical burr according to claim 8, characterized in that: The gap between the horizontal end (2043) and the wall (20134) of the middle section (2013) and the thickness of the wall (20134) can completely accommodate the ball (203).

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