Bone drill bit and base installation method

Abstract

The present invention relates to the technical field of medical devices and provides a bone drill bit and a base installation method. The bone drill bit includes a positioning component and a milling component. The positioning component includes a positioning boss, which is used to be set in a mounting hole pre-opened in the bone. The milling component includes a milling blade and a clamping part, the clamping part is connected to the milling blade, and the milling blade is connected to the positioning boss. The clamping part is used to be connected to an external power device and drive the milling blade to rotate under the action of the external power device. The bone drill bit can mill a mounting surface around the mounting hole. The shape of the mounting surface is adapted to the shape of the bottom surface of a DBS base and can be completely fitted with the bottom surface of the DBS base, thereby improving the fixing effect. During the fixing process, the DBS base will not deform, which is conducive to the subsequent fixation of an electrode locking device, thereby improving the stability of the DBS electrode wire.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly to a bone drill and a base installation method. Background Art

[0002] Deep brain stimulation (DBS), also known as brain pacemaker therapy, has developed over the past 20 years as an alternative to the invasive surgery commonly used in traditional stereotactic functional brain surgery. DBS technology uses stereotactic brain technology to implant electrodes in specific neural nuclei within the brain. High-frequency electrical stimulation inhibits abnormal neurons and their fibers, reducing the patient's overexcited state and restoring a normal, stable neural environment, thereby achieving the goal of treating the disease.

[0003] Currently, DBS electrode leads are secured to a base using a stimloc (electrode locking device), which is then fixed to the skull surface. However, because the base's bottom surface is flat, while the skull's surface is curved, and there are significant individual differences, a significant gap exists between the base and the skull after fixation, which can easily cause the base to deform. Long-term deformation stress can easily cause the base to shift, affecting the fixation of the stimloc and rendering the electrode lead ineffective. Summary of the Invention

[0004] The object of the present invention is to provide a bone drill to solve the technical problems that gaps exist when the existing base is fixed to the bone surface and the base is easily deformed.

[0005] To achieve the above object, the technical solution adopted by the present invention is: providing a bone drill bit for milling the mounting surface of the mounting base on the bone, the bone drill bit comprising a positioning component and a milling component;

[0006] The positioning assembly includes a positioning boss for being arranged in a mounting hole pre-opened in the bone;

[0007] The milling assembly includes a milling blade and a clamping portion, wherein the clamping portion is connected to the milling blade, and the milling blade is connected to the positioning boss;

[0008] The clamping portion is used to be connected to an external power device, and drives the milling cutter edge to rotate under the action of the external power device;

[0009] The milling blade is used for milling the mounting surface around the mounting hole.

[0010] In one embodiment, the milling blade includes a first base plate and a plurality of first blades;

[0011] The clamping portion and the positioning boss are respectively provided on two opposite side surfaces of the first bottom plate;

[0012] The first blades are arranged on the surface of the first bottom plate and are located on the same side of the first bottom plate as the positioning boss. The first blades extend from the side wall of the positioning boss to the edge of the first bottom plate.

[0013] In one embodiment, the diameter of the first bottom plate is not less than 26 mm.

[0014] In one embodiment, the milling surface of the first blade is a plane;

[0015] Alternatively, the milling surface of the first blade is a concave arc surface.

[0016] In one embodiment, the positioning boss is connected to a guide plate, and the guide plate extends laterally along the positioning boss;

[0017] The guide plate is provided with a milling through hole, and the milling assembly is accommodated in the milling through hole;

[0018] The positioning assembly further includes a rotating handle, which is connected to the positioning boss, and the rotating handle and the positioning boss can rotate relative to each other.

[0019] In one embodiment, the positioning boss is provided with a receiving groove, a bearing is provided in the receiving groove, an outer ring of the bearing contacts the side wall of the receiving groove, and an inner ring of the bearing is connected to one end of the rotating handle.

[0020] In one embodiment, the milling blade includes a second base plate and a plurality of second blades.

[0021] The clamping portion is provided on a side surface of the second bottom plate;

[0022] A plurality of second blades are arranged on the other side surface of the second bottom plate, and the second blades extend from the middle of the second bottom plate to the edge of the second bottom plate.

[0023] In one embodiment, the cross-sectional shape of the milling through hole is circular, and the sum of the radius of the positioning boss and the diameter of the milling through hole is not less than 13 mm.

[0024] In one embodiment, the diameter of the positioning boss is 10 mm to 16 mm.

[0025] In one embodiment, at least one exhaust hole is formed on the positioning boss.

[0026] The present invention also aims to provide a base installation method, comprising:

[0027] Opening a mounting hole at a preset position of the bone;

[0028] With the mounting hole as the center, a mounting surface is milled on the bone surface around the mounting hole;

[0029] Fix the base to the mounting surface.

[0030] The beneficial effects of the bone drill bit provided by the present invention are at least:

[0031] (1) A bone drill is provided, which can mill a mounting surface around the mounting hole. The shape of the mounting surface is adapted to the shape of the bottom surface of the DBS base, so that it can be completely fitted with the bottom surface of the DBS base without a gap between the two, and the fixing effect is better.

[0032] (2) Since the DBS base fits perfectly with the mounting surface in the skull, the DBS base will not deform during the fixation process, which is conducive to the subsequent fixation of the electrode locking device and thus improves the stability of the DBS electrode wire.

[0033] (3) Since the DBS base will not deform during the fixation process, it will not move during long-term use, ensuring that the DBS electrode wire is fixed effectively for a long time.

[0034] (4) By milling the mounting surface on the skull, the DBS base will not cause scalp bulge after installation, thus not increasing local tension on the scalp, which is conducive to incision healing. At the same time, it will not affect the appearance of the patient's head, which is conducive to enhancing the patient's confidence in treatment.

[0035] (5) Since the DBS base does not cause scalp bulge after installation, it will not be affected by external forces in daily life, which can effectively protect the DBS electrodes and scalp. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic structural diagram of the DBS base after the mounting surface of the bone drill provided in an embodiment of the present invention is prepared;

[0038] Figure 2 A schematic diagram of the exploded structure of the DBS base after the mounting surface is prepared for the bone drill provided by an embodiment of the present invention;

[0039] Figure 3 A schematic cross-sectional view of the DBS base after the mounting surface is prepared for the bone drill provided in an embodiment of the present invention;

[0040] Figure 4 A schematic structural diagram of a first bone drill bit provided in an embodiment of the present invention;

[0041] Figure 5 A schematic cross-sectional view of a first bone drill bit provided in an embodiment of the present invention;

[0042] Figure 6 A schematic structural diagram of a second bone drill bit provided in an embodiment of the present invention;

[0043] Figure 7 A schematic structural diagram of a third bone drill bit provided in an embodiment of the present invention;

[0044] Figure 8 A schematic diagram of the explosion structure of a third bone drill provided by an embodiment of the present invention;

[0045] Figure 9 A schematic structural diagram of a milling assembly in a third bone drill bit provided by an embodiment of the present invention;

[0046] Figure 10 A schematic structural diagram of a fourth bone drill bit provided in an embodiment of the present invention;

[0047] Figure 11 A schematic cross-sectional view of a fourth bone drill bit provided in an embodiment of the present invention;

[0048] Figure 12 Schematic diagram of the implementation process of the base installation method provided in the embodiment of the present invention Figure 1 ;

[0049] Figure 13 Schematic diagram of the implementation process of the base installation method provided in the embodiment of the present invention Figure 2 .

[0050] Among them, the reference numerals in the figures are:

[0051] 10-bone drill bit; 11-positioning component;

[0052] 111-positioning boss; 1110-exhaust hole;

[0053] 112-guide plate;

[0054] 1120- milling through hole; 12- milling assembly;

[0055] 121- milling cutting edge; 1211- first base plate;

[0056] 1212-first blade; 1213-second bottom plate;

[0057] 1214-second blade; 113-rotating handle;

[0058] 122-clamping part; 20-skull;

[0059] 21-mounting surface; 22-mounting hole;

[0060] 30-base. DETAILED DESCRIPTION

[0061] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0062] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be located directly or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on this technical solution. The terms "first" and "second" are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0063] See also Figures 1 to 4 A bone drill bit 10 is used for milling a mounting surface 21 of a mounting base 30 on a skull 20. The bone drill bit 10 includes a positioning assembly 11 and a milling assembly 12. The positioning assembly 11 includes a positioning boss 111, and the positioning boss 111 is used to be set in a mounting hole 22 pre-opened in the bone. The milling assembly 12 includes a milling blade 121 and a clamping portion 122, the clamping portion 122 is connected to the milling blade 121, and the milling blade 121 is connected to the positioning boss 111; wherein the clamping portion 122 is used to connect to an external power device, and drives the milling blade 121 to rotate under the action of the external power device; the milling blade 121 is used to mill a mounting surface 21 around the mounting hole 22.

[0064] See also Figures 1 to 3In one embodiment, the base 30 is a deep brain stimulation base (DBS base for short), and the bone drill 10 is used to mill the mounting surface 21 on the skull 20. When the DBS base 30 needs to be installed, a mounting hole 22 is first opened at a preset position on the skull 20 using an ordinary drill bit, and then the mounting surface 21 is milled around the mounting hole 22 using the bone drill 10, and then the DBS base 30 is fixed to the mounting surface 21. When milling the mounting surface 21, the positioning boss 111 of the bone drill 10 is first placed in the mounting hole 22, so as to play a positioning and fixing role; then the external power device is connected to the clamping portion 122 of the milling assembly 12, and the external power device is operated, thereby driving the clamping portion 122 connected thereto to rotate, and the clamping portion 122 drives the milling blade 121 connected thereto to rotate, so that the milling blade 121 can mill the skull. During the milling process, the milling blade 121 rotates, and the positioning boss 111 also rotates relative to the mounting hole 22, thereby driving the milling blade 121 connected thereto to mill around the mounting hole 22 to obtain the mounting surface 21. After the DBS base 30 is fixed, the DBS electrode wire is fixed to the base using an electrode locking device. The clamping portion 122 can be a standard chuck for a universal skull drill. Of course, in other embodiments, the bone can also be other parts of the bone, not limited to the skull; the base 30 can also be of other types, which is not limited here.

[0065] Currently, when fixing the DBS base 30, the DBS base 30 is usually fixed directly to the surface of the skull 20. However, this method has at least the following risks and drawbacks:

[0066] (1) Usually, the bottom surface of the DBS base 30 is flat, while the surface of the skull 20 is curved. In addition, individual differences are very obvious. Therefore, after the DBS base 30 is fixed, there is a significant gap between the DBS base 30 and the surface of the skull 20, which affects the fixation effect.

[0067] (2) Since the DBS base 30 cannot completely fit the surface of the skull 20, if it is fixed too tightly during the fixation process, it is easy to cause the DBS base 30 to deform, which will affect the subsequent fixation of the electrode locking device and further affect the stability of the DBS electrode wire.

[0068] (3) Since the DBS base 30 is easily deformed during the fixation process, long-term deformation stress can easily cause the DBS base 30 to shift, thereby causing the DBS electrode wire fixation to fail.

[0069] (4) Most patients who undergo DBS surgery are middle-aged or elderly, who are usually thinner. The current DBS base fixation method can easily lead to obvious scalp bulge and high local tension on the scalp, which affects the healing of the incision.

[0070] (5) The current DBS base fixing method is easily affected by external forces, which may cause damage to the DBS electrodes or scalp. In addition, the obvious bulge of the scalp affects the appearance and has a negative impact on the patient's psychology.

[0071] This embodiment proposes a new solution, which has at least the following beneficial effects:

[0072] (1) A bone drill bit 10 is provided, which can mill a mounting surface 21 around the mounting hole 22. The shape of the mounting surface 21 is adapted to the bottom shape of the DBS base 30, so that it can be completely fitted with the bottom surface of the DBS base 30 without a gap, and the fixing effect is better.

[0073] (2) Since the DBS base 30 is completely in contact with the mounting surface 21 in the skull 20, the DBS base 30 will not deform during the fixation process, which is beneficial for the subsequent fixation of the electrode locking device and can further improve the stability of the DBS electrode wire.

[0074] (3) Since the DBS base 30 does not deform during the fixation process, the DBS base 30 will not move during long-term use, ensuring that the DBS electrode wire is fixed effectively for a long time.

[0075] (4) By milling the mounting surface 21 on the skull 20, the DBS base 30 does not cause scalp bulge after installation, thereby not increasing local scalp tension, which is conducive to incision healing. At the same time, it does not affect the patient's head appearance, which helps to enhance the patient's treatment confidence.

[0076] (5) Since the DBS base 30 does not cause scalp bulge after installation, the DBS base 30 will not be affected by external forces in daily life, which can effectively protect the DBS electrodes and scalp.

[0077] See also Figure 4 and Figure 5 In one embodiment, the milling blade 121 includes a first base plate 1211 and a plurality of first blades 1212. The clamping portion 122 and the positioning boss 111 are respectively disposed on opposite sides of the first base plate 1211. For ease of description, the two opposite sides of the first base plate 1211 are referred to as the first base plate upper surface and the first base plate lower surface, respectively. The clamping portion 122 is connected to the first base plate upper surface, and the positioning boss 111 is located in the middle of the first base plate lower surface. The plurality of first blades 1212 are disposed on the first base plate lower surface, and the first blades 1212 extend from the sidewalls of the positioning boss 111 toward the edge of the first base plate 1211.

[0078] In order to provide better positioning and fixing effects, the thickness of the positioning boss 111 must be greater than the thickness of the first blade 1212, so that the positioning boss 111 protrudes outward relative to the first blade 1212. During milling, the protruding portion of the positioning boss 111 is accommodated in the mounting hole 22, and the first blade 1212 contacts the skull around the mounting hole 22, thereby allowing the skull around the mounting hole 22 to be milled.

[0079] The number of the first blades 1212 can be set as needed, and multiple first blades 1212 can be evenly distributed along the sidewall of the positioning boss 111, or unevenly distributed, and can be set as needed. The cross-sectional shape of the first blade 1212 can be rectangular. At this time, the first blade 1212 can be perpendicular to the sidewall of the positioning boss 111, or it can be at a certain angle (non-right angle) to the sidewall of the positioning boss 111, as long as the skull 20 can be milled. The cross-sectional shape of the first blade 1212 can also be other shapes, for example, the side of the first blade 1212 is a curved surface, that is, the radial direction of the first blade 1212 is curved along the circumferential direction of the first base plate 1211, thereby having a better milling effect. Of course, the first blade 1212 can also be other forms, which are not limited here.

[0080] The positioning boss 111, the first blade 1212, the first base plate 1211, and the clamping portion 122 are preferably milled from high-strength stainless steel, resulting in higher overall strength and easier manufacture. Of course, the positioning boss 111, the first blade 1212, the first base plate 1211, and the clamping portion 122 may also be connected as one in other ways, which are not limited herein.

[0081] In one embodiment, in order for the milled mounting surface 21 to be able to fully accommodate the DBS base plate 30, the size of the mounting surface 21 needs to be no smaller than the size of the DBS base plate 30. Since the first blade 1212 extends from the sidewall of the positioning boss 111 to the edge of the first base plate 1211, the size of the mounting surface 21 milled by the first blade 1212 is compatible with the size of the first base plate 1211. By setting the diameter of the first base plate 1211 to be no less than 26 mm, the diameter of the milled surface formed by the first blade 1212 is no less than 26 mm, thereby ensuring that the mounting surface 21 milled by the first blade 1212 can fully accommodate the DBS base 30.

[0082] See also Figure 4 In one embodiment, the bottom surface of the DBS base 30 is a plane. In order to ensure that the mounting surface 21 obtained by milling can fit with the bottom surface of the DBS base 30, the milling surface of the first blade 1212 (i.e., the surface where the first blade 1212 contacts the skull 20) is also a plane.

[0083] See also Figure 6 In one embodiment, in order to better fit the surface of the skull 20, the bottom surface of the DBS base 30 is a concave arc surface. At this time, in order to ensure that the mounting surface 21 obtained by milling can fit with the bottom surface of the DBS base 30, the milling surface of the first blade 1212 is also a concave arc surface, and the shape of the concave arc surface of the first blade 1212 is adapted to the bottom surface of the DBS base 30, thereby avoiding the situation where the DBS base 30 is suspended when fixed on the mounting surface 21, and the fit is tighter and the fixation is more stable.

[0084] Of course, in other embodiments, the bottom surface shape of the DBS base 30 may also be other forms and is not limited to the above-mentioned situation; the milling surface of the first blade 1212 may also be other forms accordingly, as long as it is compatible with the bottom surface shape of the DBS base, and there is no restriction here.

[0085] See also Figures 7 to 9 In one embodiment, in order to achieve precise control during the milling process and quickly mill out the sunken mounting surface 21, the positioning boss 111 is connected to a guide plate 112, which extends laterally along the positioning boss 111. The guide plate 112 is provided with a milling through hole 1120, and the milling assembly 12 is accommodated in the milling through hole 1120, so that the milling assembly 12 can be guided and its milling area can be limited at the same time. When milling the mounting surface 21, on the one hand, the external power device drives the clamping part 122 to rotate, and then drives the milling blade 121 connected to the clamping part 122 to rotate, so that the skull 20 can be milled; on the other hand, the positioning boss 111 can rotate relative to the mounting hole 22, and the guide plate 112 connected to the positioning boss 111 can rotate with the rotation of the positioning boss 111, and the milling assembly 12 accommodated in the milling through hole 1120 can rotate with the rotation of the guide plate 112, so that the milling assembly 12 can mill the skull 20 around the mounting hole 22 to form the mounting surface 21.

[0086] See also Figure 7 and Figure 8 Furthermore, the positioning assembly 11 further includes a rotating handle 113, which is connected to the positioning boss 111 and can rotate relative to the positioning boss 111. During milling, the rotating handle 113 can be fixed by hand or by a mechanical arm, so that one end of the positioning boss 111 is accommodated in the mounting hole 22. When the positioning boss 111 drives the guide plate 112, and thus drives the milling assembly 12 to rotate, the rotating handle 113 is relatively fixed, thereby ensuring a smoother milling process.

[0087] In one embodiment, the positioning boss 111 is connected to the rotating handle 113 via a precision bearing, which is concentrically assembled and freely rotatable. The bearing includes an outer ring, an inner ring, and balls filled between the outer and inner rings, so that the outer and inner rings can rotate relative to each other. The positioning boss 111 is provided with a receiving groove, in which the bearing is disposed, and the outer ring of the bearing contacts the sidewall of the receiving groove, and the inner ring of the bearing is connected to one end of the rotating handle 113 (i.e., the inner ring of the bearing is sleeved on one end of the rotating handle). When milling, the rotating handle 113 is fixed, thereby limiting the position of the positioning boss 111 in the longitudinal direction. At the same time, the positioning boss 111 can rotate relative to the rotating handle 113, thereby driving the milling assembly 12 to mill the skull 20 around the mounting hole 22 to obtain the mounting surface 21.

[0088] Of course, in other embodiments, the positioning boss 111 and the rotating handle 113 may be rotatably connected in other ways, and are not limited to the above-mentioned situation.

[0089] See also Figure 8 and Figure 9 In one embodiment, the milling blade 121 includes a second base plate 1213 and a plurality of second blades 1214. The clamping portion 122 and the second blades 1214 are respectively disposed on opposite sides of the second base plate 1213. For ease of description, the opposite sides of the second base plate 1213 are referred to as the second base plate upper surface and the second base plate lower surface, respectively. The clamping portion 122 is connected to the second base plate upper surface, and the plurality of second blades 1214 are disposed on the second base plate lower surface, extending from the middle of the second base plate lower surface toward the edge of the second base plate 1213.

[0090] The number of the second blades 1214 can be set as needed, and a plurality of second blades 1214 can be evenly distributed along the middle part of the lower surface of the second base plate, or can be unevenly distributed and set as needed. The cross-sectional shape of the second blade 1214 can be rectangular, and now a plurality of second blades 1214 are radially arranged on the lower surface of the second base plate. The cross-sectional shape of the second blade 1214 can also be other shapes, for example, the side of the second blade 1214 is a curved surface, that is, the radial direction of the second blade 1214 is curved along the circumferential direction of the second base plate 1213, thereby being able to have a better milling effect. Of course, the second blade 1214 can also be other forms, which are not limited here.

[0091] The second blade 1214, the second base plate 1213 and the clamping portion 122 are preferably milled from high-strength stainless steel, which provides higher overall strength and is easier to manufacture. Of course, the second blade 1214, the second base plate 1213 and the clamping portion 122 can also be connected as one in other ways, which is not limited here.

[0092] In one embodiment, in order for the milled mounting surface 21 to be able to fully accommodate the DBS base 30, the size of the mounting surface 21 must be no smaller than that of the DBS base 30. Since the second blade 1214 extends from the center of the lower surface of the second base plate to the edge of the second base plate 1213, the size of the mounting surface 21 milled by the second blade 1214 is compatible with the size of the second base plate 1213. By adjusting the diameter of the second base plate 1213 so that the milled surface formed by the second blade 1214 meets the requirements, the diameter of the mounting surface 21 milled by the second blade 1214 is ensured to be no less than 26 mm, fully accommodating the DBS base 30.

[0093] In one embodiment, the cross-sectional shape of the milling through hole 1120 is circular, and the sum of the distance between the center of the milling through hole 1120 and the center of the positioning boss 111 and the radius of the milling through hole is not less than 13 mm, that is, the distance between the farthest point in the milling through hole 1120 and the center of the positioning boss 111 is not less than 13 mm (that is, the sum of the radius of the positioning boss 111 and the diameter of the second base plate 1213 is not less than 13 mm), and the milling surface formed by the second blade 1214 in the milling assembly 12 is adapted to the size of the milling through hole 1120, thereby ensuring that the diameter of the obtained mounting surface 21 is not less than 26 mm.

[0094] In one embodiment, the diameter of positioning boss 111 is 10 mm to 16 mm (e.g., 14 mm), which is compatible with the diameter of mounting hole 22, thereby facilitating the passage of the DBS electrode wire. When the diameter of positioning boss 111 is 10 mm, the diameter of second base plate 1213 is no less than (13-10 / 2) = 8 mm, corresponding to a diameter of the milling surface formed by second blade 1214 of no less than 8 mm. When the diameter of positioning boss 1112 is 14 mm, the diameter of second base plate 1213 is no less than (13-14 / 2) = 6 mm, corresponding to a diameter of the milling surface formed by second blade 1214 of no less than 6 mm. When the diameter of positioning boss 1112 is 16 mm, the diameter of second base plate 1213 is no less than (13-16 / 2) = 5 mm, corresponding to a diameter of the milling surface formed by second blade 1214 of no less than 5 mm.

[0095] See also Figure 10 and Figure 11Considering that the bone drill bit 10 generates heat during the milling process, thereby heating the inside of the skull 20, which easily causes the intracranial air pressure to expand, it is necessary to discharge the gas in the skull to reduce the intracranial air pressure. In one embodiment, at least one exhaust hole 1110 is also provided on the positioning boss 111. The exhaust hole 1110 is a through hole opened longitudinally along the positioning boss 111, so that the bone drill bit 10 can discharge the gas from the body in time during the milling process. The number of exhaust holes 1110 can be set as needed, for example, it can be one, two or even more, which is not limited here.

[0096] Several embodiments of the bone drill 10 are provided below. It should be understood that the following embodiments are merely illustrative and are not intended to limit the bone drill 10 .

[0097] See also Figure 4 and Figure 5 , Example 1:

[0098] A bone drill bit 10 includes a positioning component 11 and a milling component 12.

[0099] The positioning assembly 11 includes a positioning boss 111 . The positioning boss 111 is used to be disposed in a mounting hole 22 pre-opened in the skull 20 . The diameter of the positioning boss 111 is 10 mm to 16 mm.

[0100] The milling assembly 12 includes a milling blade 121 and a clamping portion 122. The milling blade 121 includes a first base plate 1211 and a plurality of first blades 1212. The clamping portion 122 and the positioning boss 111 are respectively disposed on opposite sides of the first base plate 1211. For ease of description, the opposite sides of the first base plate 1211 are referred to as the first base plate upper surface and the first base plate lower surface, respectively. The clamping portion 122 is connected to the first base plate upper surface, the positioning boss 111 is located in the middle of the first base plate lower surface, and the plurality of first blades 1212 are disposed on the first base plate lower surface, extending from the sidewalls of the positioning boss 111 to the edge of the first base plate 1211. The thickness of the positioning boss 111 is greater than the thickness of the first blade 1212, so that the positioning boss 111 protrudes outward relative to the first blade 1212. During milling, the protruding portion of the positioning boss 111 is accommodated in the mounting hole 22, and the first blade 1212 contacts the skull around the mounting hole 22, thereby allowing the skull around the mounting hole 22 to be milled.

[0101] The diameter of the first base plate 1211 in the milling blade 121 is no less than 26 mm, resulting in a milling surface formed by the plurality of first blades 1212 having a diameter no less than 26 mm, ensuring that the resulting mounting surface 21 has a diameter no less than 26 mm. The milling surface of the first blades 1212 is planar, resulting in a planar mounting surface 21 that facilitates contact with the flat bottom surface of the DBS base 30.

[0102] See also Figure 6 , Example 2:

[0103] A bone drill bit 10 includes a positioning component 11 and a milling component 12.

[0104] The positioning assembly 11 includes a positioning boss 111 . The positioning boss 111 is used to be disposed in a mounting hole 22 pre-opened in the skull 20 . The diameter of the positioning boss 111 is 10 mm to 16 mm.

[0105] The milling assembly 12 includes a milling blade 121 and a clamping portion 122. The milling blade 121 includes a first base plate 1211 and a plurality of first blades 1212. The clamping portion 122 and the positioning boss 111 are respectively disposed on opposite sides of the first base plate 1211. For ease of description, the opposite sides of the first base plate 1211 are referred to as the first base plate upper surface and the first base plate lower surface, respectively. The clamping portion 122 is connected to the first base plate upper surface, the positioning boss 111 is located in the middle of the first base plate lower surface, and the plurality of first blades 1212 are disposed on the first base plate lower surface, extending from the sidewalls of the positioning boss 111 to the edge of the first base plate 1211. The thickness of the positioning boss 111 is greater than the thickness of the first blade 1212, so that the positioning boss 111 protrudes outward relative to the first blade 1212. During milling, the protruding portion of the positioning boss 111 is accommodated in the mounting hole 22, and the first blade 1212 contacts the skull around the mounting hole 22, thereby allowing the skull around the mounting hole 22 to be milled.

[0106] The diameter of the first base plate 1211 in the milling blade 121 is no less than 26 mm, resulting in a milling surface formed by the plurality of first blades 1212 having a diameter no less than 26 mm, ensuring that the resulting mounting surface 21 has a diameter no less than 26 mm. The milling surface of the first blades 1212 is a concave arc, resulting in a flat mounting surface 21 that facilitates contact with the concave arc bottom surface of the DBS base 30.

[0107] See also Figures 7 to 9 , Example 3:

[0108] A bone drill bit 10 includes a positioning component 11 and a milling component 12.

[0109] The positioning assembly 11 includes a positioning boss 111, a guide plate 112 and a rotating handle 113, so that the milling process can be precisely controlled. The positioning boss 111 is used to be set in the mounting hole 22 pre-opened in the skull 20. The diameter of the positioning boss 111 is 10mm to 16mm.

[0110] The guide plate 112 is connected to the positioning boss 111 and extends laterally along the positioning boss 111. The guide plate 112 is provided with a milling through hole 1120. The milling assembly 12 is accommodated in the milling through hole 1120, thereby guiding the milling assembly 12 and limiting its milling area.

[0111] The rotating handle 113 is connected to the positioning boss 111 via a precision bearing. The two are concentrically assembled and can rotate freely. The bearing includes an outer ring, an inner ring, and balls filled between the outer and inner rings, so that the outer and inner rings can rotate relative to each other. The positioning boss 111 is provided with a receiving groove, in which the bearing is located. The outer ring of the bearing contacts the side wall of the receiving groove, and the inner ring of the bearing is connected to one end of the rotating handle 113 (i.e., the inner ring of the bearing is sleeved on one end of the rotating handle). During milling, the rotating handle 113 can be fixed by hand or by a mechanical arm, so that one end of the positioning boss 111 is accommodated in the mounting hole 22. When the positioning boss 111 drives the guide plate 112, and then drives the milling assembly 12 to rotate, the rotating handle 113 is relatively fixed, thereby ensuring a smoother milling process.

[0112] The milling blade 121 includes a second base plate 1213 and a plurality of second blades 1214. The clamping portion 122 and the second blades 1214 are respectively disposed on opposite sides of the second base plate 1213. For ease of description, the two opposite sides of the second base plate 1213 are referred to as the second base plate upper surface and the second base plate lower surface, respectively. The clamping portion 122 is connected to the second base plate upper surface, and the plurality of second blades 1214 are disposed on the second base plate lower surface, extending from the middle of the second base plate lower surface to the edge of the second base plate 1213.

[0113] The cross-sectional shape of the milling through hole 1120 is circular, and the distance from the farthest point in the milling through hole 1120 to the center of the positioning boss 111 is not less than 13 mm (that is, the sum of the radius of the positioning boss 111 and the diameter of the second base plate 1213 is not less than 13 mm). The milling surface formed by the second blade 1214 in the milling assembly 12 is adapted to the size of the milling through hole 1120, thereby ensuring that the diameter of the obtained mounting surface 21 is not less than 26 mm.

[0114] See also Figure 10 and Figure 11 , Example 4:

[0115] A bone drill bit 10 includes a positioning component 11 and a milling component 12.

[0116] The positioning assembly 11 includes a positioning boss 111 . The positioning boss 111 is used to be disposed in a mounting hole 22 pre-opened in the skull 20 . The diameter of the positioning boss 111 is 10 mm to 16 mm.

[0117] The milling assembly 12 includes a milling blade 121 and a clamping portion 122. The milling blade 121 includes a first base plate 1211 and a plurality of first blades 1212. The clamping portion 122 and the positioning boss 111 are respectively disposed on opposite sides of the first base plate 1211. For ease of description, the opposite sides of the first base plate 1211 are referred to as the first base plate upper surface and the first base plate lower surface, respectively. The clamping portion 122 is connected to the first base plate upper surface, the positioning boss 111 is located in the middle of the first base plate lower surface, and the plurality of first blades 1212 are disposed on the first base plate lower surface, extending from the sidewalls of the positioning boss 111 to the edge of the first base plate 1211. The thickness of the positioning boss 111 is greater than that of the first blade 1212, so that the positioning boss 111 protrudes outward relative to the first blade 1212. During milling, the protruding portion of the positioning boss 111 is received in the mounting hole 22, while the first blade 1212 contacts the skull surrounding the mounting hole 22, thereby milling the skull surrounding the mounting hole 22. At least one exhaust hole 1110 is formed in the positioning boss 111.

[0118] The diameter of the first base plate 1211 in the milling blade 121 is no less than 26 mm, resulting in a milling surface formed by the plurality of first blades 1212 having a diameter no less than 26 mm, ensuring that the resulting mounting surface 21 has a diameter no less than 26 mm. The milling surface of the first blades 1212 is planar, resulting in a planar mounting surface 21 that facilitates contact with the flat bottom surface of the DBS base 30.

[0119] See also Figure 12 , the purpose of this embodiment is also to provide a base installation method, including:

[0120] Step S10: Opening a mounting hole at a preset position of the bone.

[0121] Step S20: With the mounting hole as the center, a mounting surface is milled on the bone surface around the mounting hole.

[0122] Step S30: Fix the base to the installation surface.

[0123] In one embodiment, the base is a deep brain stimulation base (i.e., a DBS base), which is mounted on the patient's skull to facilitate subsequent fixation of the DBS electrode wires to the DBS base via an electrode locking device. In this case, the bone is the skull. Mounting holes are opened in the skull to allow for subsequent insertion of the DBS electrodes. To secure the DBS electrodes, the DBS base needs to be mounted on the skull. Of course, in other embodiments, the bone can also be other parts of the skeleton, and is not limited to the above-described situation.

[0124] See also Figure 13 Furthermore, in order to determine the preset position of the bone, before step S10, the following steps are further included:

[0125] Step S01: Mark the target site on the bone surface and record the target site as a preset position.

[0126] Furthermore, in step S10, the diameter of the mounting hole is 10 mm to 16 mm, for example, 14 mm, so as to facilitate operation and the passing and fixing of the DBS electrode wire.

[0127] Furthermore, step S20 includes:

[0128] Step S21: With the center of the mounting hole as the center, concentric circles of a preset diameter are marked on the bone surface. The area within the concentric circles is the area to be cut. The preset diameter is no less than 26 mm, ensuring that the resulting mounting surface 21 can fully accommodate the DBS base.

[0129] Step S22: milling the area to be cut to obtain a mounting surface. The milling can be performed by a common grinding drill or by the bone drill bit as long as a suitable mounting surface can be obtained.

[0130] When the bottom surface of the DBS base is flat, a common milling drill with a flat milling surface or the bone drill with a flat milling surface can be used.

[0131] When the bottom surface of the DBS base is a concave arc surface, a common grinding drill with a concave arc surface or a bone drill with a concave arc surface can be used for milling.

[0132] To conceal the DBS base and prevent it from being visible, the mounting surface should be at least 2mm deep relative to the bone surface. For example, if the bone is the skull, the mounting surface should be at least 2mm deep relative to the skull surface, allowing the DBS base to be completely contained within the skull without visible protrusion.

[0133] Furthermore, in step S30, the DBS base is fixed to the mounting surface by at least two screws, ensuring a secure fixation and simple operation. Of course, the DBS base can also be fixed by other means, not limited to the above situation.

[0134] Furthermore, after the DBS base is fixed, the following steps are also included:

[0135] Step S40: Fix the electrode wire to the base using the electrode locking device. The electrode wire can be a DBS electrode wire, and the base corresponds to a DBS base. Of course, the electrode wire can also be other types, which is not limited here.

[0136] Currently, when fixing the DBS base, it is usually fixed directly to the surface of the skull. However, this method has at least the following risks and defects:

[0137] (1) Usually, the bottom surface of the DBS base is flat, while the surface of the skull is curved, and there are obvious individual differences. Therefore, after the DBS base is fixed, there is an obvious gap between the DBS base and the skull surface, which affects the fixation effect.

[0138] (2) Since the DBS base cannot fit completely with the skull surface, if it is fixed too tightly during the fixation process, it is easy to cause the DBS base to deform, which will affect the subsequent fixation of the electrode locking device and further affect the stability of the DBS electrode wire.

[0139] (3) Since the DBS base is prone to deformation during the fixation process, long-term deformation stress can easily cause the DBS base to shift, resulting in failure of DBS electrode wire fixation.

[0140] (4) Most patients who undergo DBS surgery are middle-aged or elderly, who are usually thinner. The current DBS base fixation method can easily lead to obvious scalp bulge and high local tension on the scalp, which affects the healing of the incision.

[0141] (5) The current DBS base fixing method is easily affected by external forces, which may cause damage to the DBS electrodes or scalp. In addition, the obvious bulge of the scalp affects the appearance and has a negative impact on the patient's psychology.

[0142] This embodiment proposes a new solution, which achieves the fixation of the DBS base by milling a mounting surface on the skull and fixing the DBS base on the mounting surface, which has at least the following beneficial effects:

[0143] (1) Since the shape of the mounting surface is adapted to the bottom shape of the DBS base, it can fit completely with the bottom surface of the DBS base without any gap between the two, and the fixing effect is better.

[0144] (2) Since the DBS base fits perfectly with the mounting surface in the skull, the DBS base will not deform during the fixation process, which is conducive to the subsequent fixation of the electrode locking device and thus improves the stability of the DBS electrode wire.

[0145] (3) Since the DBS base will not deform during the fixation process, it will not move during long-term use, ensuring that the DBS electrode wire is fixed effectively for a long time.

[0146] (4) By milling the mounting surface on the skull, the DBS base will not cause scalp bulge after installation, thus not increasing local tension on the scalp, which is conducive to incision healing. At the same time, it will not affect the appearance of the patient's head, which is conducive to enhancing the patient's confidence in treatment.

[0147] (5) Since the DBS base does not cause scalp bulge after installation, it will not be affected by external forces in daily life, which can effectively protect the DBS electrodes and scalp.

[0148] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bone drill bit for milling the mounting surface of a mounting base on a bone, characterized in that: The bone drill bit includes a positioning component and a milling component; The positioning assembly includes a positioning boss for being arranged in a mounting hole pre-opened in the bone; The milling assembly includes a milling blade and a clamping portion, wherein the clamping portion is connected to the milling blade, and the milling blade is connected to the positioning boss; The clamping portion is used to be connected to an external power device, and drives the milling cutter edge to rotate under the action of the external power device; The milling blade is used for milling the mounting surface around the mounting hole; The positioning boss is connected to a guide plate, and the guide plate extends laterally along the positioning boss; The guide plate is provided with a milling through hole, and the milling assembly is accommodated in the milling through hole; The positioning assembly further includes a rotating handle, the rotating handle is connected to the positioning boss, and the rotating handle and the positioning boss are relatively rotatable; During milling, the positioning boss rotates relative to the mounting hole, the guide plate connected to the positioning boss rotates as the positioning boss rotates, and the milling assembly accommodated in the milling through hole rotates as the guide plate rotates. The milling assembly mills the skull around the mounting hole to form the mounting surface. The milling blade includes a first base plate and a plurality of first blades; The milling surface of the first blade is a plane; Alternatively, the milling surface of the first blade is a concave arc surface.

2. The bone drill bit according to claim 1, wherein The clamping portion and the positioning boss are respectively provided on two opposite side surfaces of the first bottom plate; The first blades are arranged on the surface of the first bottom plate and are located on the same side of the first bottom plate as the positioning boss. The first blades extend from the side wall of the positioning boss to the edge of the first bottom plate.

3. The bone drill bit according to claim 2, wherein: The diameter of the first bottom plate is not less than 26 mm.

4. The bone drill bit according to claim 1, wherein The positioning boss is provided with a receiving groove, a bearing is provided in the receiving groove, the outer ring of the bearing contacts the side wall of the receiving groove, and the inner ring of the bearing is connected to one end of the rotating handle.

5. The bone drill bit according to claim 1, wherein: The milling blade includes a second base plate and a plurality of second blades, The clamping portion is provided on a side surface of the second bottom plate; A plurality of second blades are arranged on the other side surface of the second bottom plate, and the second blades extend from the middle of the second bottom plate to the edge of the second bottom plate.

6. The bone drill bit according to claim 1, wherein: The cross-sectional shape of the milling through hole is circular, and the sum of the radius of the positioning boss and the diameter of the milling through hole is not less than 13 mm.

7. The bone drill according to any one of claims 1 to 6, characterized in that: The diameter of the positioning boss is 10 mm to 16 mm.

8. The bone drill according to any one of claims 1 to 6, characterized in that: At least one exhaust hole is formed on the positioning boss.

Images