Surgical bur

Abstract

The application discloses a surgical grinding drill and belongs to the technical field of medical devices. The surgical grinding drill specifically comprises machine elements and at least one coupling sleeve. A grinding head rod with a grinding head arranged at the end is arranged in the coupling sleeve. A groove is circumferentially arranged on the grinding head rod near the end away from the grinding head. The grinding head rod is symmetrically cut along the axis on both sides away from the end of the grinding head to form a clamping section with a platform. The machine elements comprise a machine element body in the form of a coaxial cylinder with multiple sections with different diameters, which can rotate. The machine element body comprises a front end section, a middle section and a tail end section. A long axis hole matched with the outer diameter of the grinding head rod is arranged through the front end section and extends to the clamping groove. Positioning holes are circumferentially arranged on the middle section corresponding to the groove. Ball bearings are arranged in the positioning holes. The application provides a structure for coaxial rotation and convenient installation and replacement of the grinding head rod.

Description

Technical Field

[0001] This invention relates to a medical device, specifically to a surgical drill, comprising a machine element body in the form of multiple coaxial cylindrical sections of different diameters capable of rotational motion, providing a structure for coaxial rotation and facilitating the installation and replacement of the drill head rod. Background Technology

[0002] Surgical drills, also known as grinding drills, are mainly used in clinical surgeries such as orthopedics and neurosurgery that require cutting or grinding. Preventing shaft misalignment during rotation is crucial for the performance of the drill bit. Even slight shaft misalignment during high-speed rotation can affect its lifespan. Therefore, it is necessary to improve the mounting method and coaxial rotation of the drill bit rod. Summary of the Invention

[0003] The main objective of this invention is to provide a structure that allows for coaxial rotation and easy installation and replacement of the grinding head rod, thereby improving the working stability and service life of the grinding head drill.

[0004] To achieve the above objectives, the present invention provides a surgical drill, which includes a machine element and at least one connecting sleeve. A grinding head rod with a grinding head at one end is inserted into the connecting sleeve. The grinding head rod has a cylindrical structure. A groove is circumferentially formed in the vicinity of the end of the grinding head away from the grinding head. A locking section with a platform is symmetrically cut along both sides of the axis at the end of the grinding head away from the grinding head. The machine element includes a machine element body that is configured as a coaxial cylinder with multiple segments of different diameters and capable of rotational movement. The machine element body includes a front end segment and a tail end segment for assembling bearings, and an intermediate segment coaxially disposed between the front end segment and the tail end segment. A locking groove matching the locking section is provided axially in the intermediate segment. A long shaft hole matching the outer diameter of the grinding head rod is opened through the front end segment and extends to the locking groove. A positioning hole is circumferentially formed in the intermediate segment corresponding to the groove, and a ball bearing is disposed in the positioning hole.

[0005] Preferably, the at least one connecting sleeve is connected by a threaded structure, and the connecting sleeve is provided with a bearing that matches the outer diameter of the grinding head rod.

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

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

[0008] Preferably, a flange is provided in the positioning hole near the grinding head rod to prevent the ball from dislodging.

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

[0010] Preferably, the groove has two transverse surfaces that are inclined to each other in the form of a cone angle along the radial direction of the grinding head rod, the cone angle being in the range of 60° to 120°.

[0011] Preferably, the machine element further includes a long shaft sleeve coaxially arranged outside the middle section of the machine element body and surrounding the ball, the long shaft sleeve being slidable along the axial direction of the middle section, and the long shaft sleeve having a wedge-shaped cut corresponding to the section surrounding the ball, the wedge-shaped cut being coaxial with the long shaft sleeve.

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

[0013] Preferably, the gap between the horizontal end and the wall of the intermediate section and the thickness of the wall can fully accommodate the ball bearing.

[0014] The surgical drill proposed in this application is constructed as a rotating machine component body in the form of multiple coaxial cylindrical sections of different diameters. The machine component body is provided with long shaft holes, slots and positioning holes, and coaxial rotation is achieved through bearing engagement. It also features easy installation and replacement of the grinding head rod. Attached Figure Description

[0015] Figure 1 This is a three-dimensional view of the surgical drill involved in this invention.

[0016] Figure 2 This is a perspective view of the surgical drill involved in this invention.

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

[0018] Figure 4 This is a perspective view of the grinding head rod involved in this invention.

[0019] Figure 5 This is a partial cross-sectional view of the surgical drill involved in this invention.

[0020] Figure 6 This is a perspective view of the machine component body involved in the present invention.

[0021] Figure 7 This is a partial cross-sectional view of the surgical drill involved in this invention.

[0022] Figure 8 yes Figure 7 A magnified view of A in the middle.

[0023] Figure 9 This is a partial cross-sectional view of the surgical drill involved in this invention.

[0024] Attached icon numbers and names:

[0025] 10. Medical devices;

[0026] 12. A surgical drill;

[0027] 14. Outer shell;

[0028] 16. Drive motor;

[0029] 18. Transmission device;

[0030] 20. Machine components;

[0031] 201. Machine component body;

[0032] 2011, Front end section; 2012, Tail end section; 2013, Middle section; 20131, Slot; 20132, Long shaft hole; 20133, Positioning hole; 20133a, Flange; 20134, Wall; 2014, Protrusion stop;

[0033] 202. Bearings;

[0034] 203. Ball bearings;

[0035] 204. Long shaft sleeve; 2041. Section; 2042. Wedge-shaped notch; 2043. Horizontal end; 2044. Partition.

[0036] 22. Connecting sleeve;

[0037] 221. Sleeve body; 222. Internal thread; 223. Connecting part; 224. External thread;

[0038] 24. Grinding head rod;

[0039] 241. Groove; 2411. Transverse surface; 2412. Cone angle; 2413. Depth;

[0040] 242. Positioning Section

[0041] 26. Grinding head;

[0042] 28. Bearings;

[0043] 30. Longitudinal central axis;

[0044] R1 is the outer inner diameter of the sleeve body.

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

[0046] R3, outer diameter of the connector;

[0047] R4, the inner diameter of the connector;

[0048] R5, the inner diameter of the bearing;

[0049] R6, diameter;

[0050] D1, thickness;

[0051] W1, Spring.

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

[0053] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0054] Figure 1 The figure schematically illustrates an embodiment of a surgical drill 12, the entire of which is designated by reference numeral 10.

[0055] The medical device 10 includes a housing 14 serving as a handle, within which a drive motor 16 is disposed. Selectively, a storage power source, including solid, semi-solid, or liquid energy storage media such as lithium-ion batteries or sodium-ion batteries, can be used to supply operating voltage to the drive motor 16 independently of the power transmission line, or the operating voltage can be supplied to the drive motor 16 via the power transmission line or, after conversion by a switching power supply, via a power line.

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

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

[0058] The machine element 20 also includes a connecting sleeve 22 at its end away from the transmission device 18, the connecting sleeve 22 being detachably connected 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 its end is inserted inside the connecting sleeve 22. The grinding head 26 has grooves or teeth. The connecting sleeve 22 can be divided into multiple sections and quickly connected by a threaded structure. 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 high speed, friction between the grinding head rod 24 and the inner wall of the connecting sleeve 22 is avoided, and centrifugal rotation of the grinding head rod 24 is also avoided, which would reduce the performance of the equipment.

[0060] As Figure 2 and Figure 3 shown, the coupling sleeve 22 is provided with internal threads 222 at both ends on the sleeve body 221, and forms the outer diameter R1 of the sleeve body 221. The inner diameter R2 of the inner side of the sleeve body 221 is smaller than the outer diameter R1 of the sleeve body 221 (i.e., R2 < R1). When multiple coupling sleeves 22 are provided, the coupling sleeves 22 are connected by a connector 223 having external threads 224. The external threads 224 are matched with the internal threads 222 on the sleeve body 221. The outer diameter R3 of the connector 223 is matched with 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 is also smaller than the inner diameter R4 of the connector 223, and is matched with 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 along both sides of 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 that the machine element body 201 and the grinding head rod 24 perform coaxial rotation, the machine element body 201 is configured in the form of multiple coaxial cylinders with 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] A middle section 2013 with a diameter larger than that of the front section 2011 or the tail section 2012 is coaxially arranged between the front section 2011 and the tail section 2012. The middle section 2013 has a groove 20131 that matches the locking section 242 of the grinding head rod 24 at the middle position along the longitudinal central axis 30. A long shaft hole 20132 that matches the outer diameter of the grinding head rod 24 is opened through the front section 2011 and extends to the groove 20131 of the middle section 2013. A positioning hole 20133 is opened circumferentially on the middle section 2013 corresponding to the groove 241 on the grinding head rod 24. A ball bearing 203 is arranged in the positioning hole 20133.

[0065] The positioning holes 20133 on the middle section 2013 are evenly distributed around the circumference. The number of positioning holes 20133 is 3, 4, 6 or more, preferably 3 or 4.

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

[0067] A flange 20133a is provided inside the positioning hole 20133 near the grinding head rod 24. The flange 20133a is used to prevent the ball 203 from disengaging along the radial direction of the machine component body 201 and entering the long shaft hole 20132 (see...). Figure 8 ).

[0068] The groove 241 on the grinding head rod 24 has two transverse surfaces 2411, which facilitate the disengagement of the ball 203 from the groove 241 when installing or replacing the grinding head rod 24. The two transverse surfaces 2411 are inclined towards each other at a conical angle 2412 along the radial direction of the grinding head rod 24. The conical angle 2412 is between 60° and 120°.

[0069] The groove 241 on the grinding head rod 24 has a depth 2413, which is closely related to the taper 2412 of the two transverse surfaces 2411 (the width of the groove remains fixed). When the ball 203 is assembled with the groove 241, a point on the spherical surface of the ball 203 contacts the two transverse surfaces 2411 on the groove 241. When a larger angle is selected for the taper 2412, the tangent point (contact point) between the two transverse surfaces 2411 and the ball 204 moves downward, that is, the length of the secant line in the cross-sectional view decreases. Correspondingly, the length of the line perpendicular to the secant line and whose extension passes through the center to the surface of the ball 204 decreases, and the depth 2413 of the groove 241 decreases. This ensures that the ball 204 can more easily detach from the groove 241, facilitating the installation and replacement of the grinding head rod. In addition, machining the groove 241 with a smaller depth 2413 can avoid reducing the strength of the grinding head rod 24.

[0070] Please see Figure 9 The machine component 20 further includes a long shaft sleeve 204, which is coaxially arranged with the longitudinal central axis 30 on the outside of the intermediate section 2013 of the machine component body 201 and surrounds the ball 203. The long shaft sleeve 204 can slide axially along the intermediate section 2013 of the machine component body 201. The long shaft sleeve 204 is provided with a wedge-shaped cut 2042 corresponding to the section 2041 surrounding the ball 203. The wedge-shaped cut 2042 is coaxial with the long shaft sleeve 204. A horizontal end 2043 is provided at the end of the wedge-shaped cut 2042. At this time, the inner diameter of the horizontal end 2043 is larger than the outer diameter of the intermediate section 2013. More specifically, the gap between the horizontal end 2043 and the wall 20134 of the intermediate 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-described manner coordinates with each other so that the ball 203 can roll in the radial direction of the machine component body 201 and disengage from the groove 241 on the grinding head rod 24 when the grinding head rod 24 is pulled out.

[0071] A baffle 2044 is provided at one end of the long shaft sleeve 204 away from the section 2041. In conjunction with the spring W1 sleeved on the middle section 2013, an axial force is applied to the long shaft sleeve 204. Under the action of the axial force, the wedge-shaped cut 2042 generates radial pressure on the ball 203, forcing the ball 203 into the groove 241 of the grinding head rod 24, thereby locking and coaxially fixing the grinding head rod 24.

[0072] Please see again. Figure 7 Spring W1 is sleeved on the middle section 2013 and abuts against the stop protrusion 2014 provided between the middle section 2013 and the tail section 2012. The other end of spring W1 abuts against the partition part 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 component body 201. The specific connection method includes other forms such as hinge and snap-fit. There are no restrictions on the connection method.

Claims

1. A surgical drill (12) having a machine element (20) and at least one connecting sleeve (22) having a grinding head rod (24) with a grinding head (26) at its end inserted inside the connecting sleeve (22), the grinding head rod (24) being a cylindrical structure, the machine element (20) including a machine element body (201) configured as having multiple coaxial cylindrical sections of different diameters capable of rotational movement, the machine element body (201) including a front end section (2011) and a rear end section (2012) for assembling bearings, and an intermediate section (2013) coaxially disposed between the front end section (2011) and the rear end section (2012). Its features are, A groove (241) is circumferentially formed in the area near the end of the grinding head (26) away from the grinding head (26). A positioning hole (20133) is circumferentially formed on the middle section (2013) corresponding to the groove (241). A ball (203) is disposed in the positioning hole (20133). The number of positioning holes (20133) is 3, 4 or 6. A flange (20133a) is provided in the positioning hole (20133) near the grinding head (24) to prevent the ball (203) from falling out. The grinding head rod (24) is symmetrically cut along both sides of the axis at one end away from the grinding head (26) to form a locking section (242) with a platform. The middle section (2013) is provided with a locking groove (20131) that matches the locking section (242) along the axial direction. A long shaft hole (20132) that matches the outer diameter of the grinding head rod (24) is opened through the front end section (2011) and extends to the locking groove (20131). The groove (241) has two transverse surfaces (2411) that are inclined to each other in the form of a cone angle (2412) along the radial direction of the grinding head rod (24), the cone angle (2412) being in the range of 60° to 120°; The at least one connecting sleeve (22) is connected by a threaded structure, and the connecting sleeve (22) is provided with a bearing that matches the outer diameter of the grinding head rod (24); The machine component (20) further includes a long shaft sleeve (204) coaxially arranged outside the middle section (2013) of the machine component body (201) and surrounding the ball (203). The long shaft sleeve (204) can slide along the axial direction of the middle section (2013). The long shaft sleeve (204) is provided with a wedge-shaped cut (2042) corresponding to the section (2041) surrounding the ball (203). The wedge-shaped cut (2042) is coaxial with the long shaft sleeve (204). The end of the wedge-shaped cut (2042) is provided with a horizontal end (2043). The inner diameter of the horizontal end (2043) is larger than the outer diameter of the middle section (2013). 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).

2. The surgical drill according to claim 1, characterized in that, The diameter of the front end section (2011) is equal to the diameter of the tail end section (2012).

3. The surgical drill according to claim 1, characterized in that, The diameter of the ball (203) is 1.2 to 1.5 times the thickness of the wall (20134) of the intermediate section (2013).

Images