Drill adjustment system

Abstract

This system provides a drill adjustment mechanism that allows for easy and precise control of the drill insertion direction and depth when drilling holes in bone. [Solution] The device comprises a drill 1, a longitudinally shaped drill sleeve 2, and a fixing device 3 that is movable and can be fixed along the axial direction of the drill 1. The fixing device 3 comprises a cylindrical member 12, a recessed member 13 attached to the cylindrical member 12, a head member 14 that fits into the recessed member 13 and is movable, a pusher member 15 connected to the head member 14 and is movable, and a fixing member 29 that connects the pusher member 15 to the head member 14.

Description

Technical Field

[0001] The present invention relates to a drill adjustment system that controls the insertion direction of a surgical drill while managing the penetration depth.

Background Art

[0002] In orthopedic surgery or fracture treatment, etc., implants such as bone screws and pins may be inserted to fix the bone. In such cases, a drill device equipped with a surgical drill bit (hereinafter referred to as a drill) may be used to create a pilot hole in the bone (see, for example, Patent Document 1 below).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Bone is covered with hard cortical bone and soft cancellous bone. When excavating inside cancellous bone, there is no great resistance, so it is easy for the operator to control the depth and direction of the drill. However, when excavating cortical bone, since the bone is hard, excavation may be performed while applying axial pressure, and after the excavation is completed, the axial pressure cannot be released, and the drill may be inserted all the way to the depth.

[0005] Also, regarding the insertion direction of the drill, when excavation is performed while applying axial pressure, the direction may deviate, the hole drilled in the bone may become larger, or the hole may not be drilled in the targeted direction, and there is a risk that proper fixation with the implant cannot be achieved. In the case of drilling a through hole in the bone, the opposite side of the bone is often not visible. If there are blood vessels, nerves, etc. on the back side, they cannot be confirmed or protected, and there is a possibility of damaging them.

[0006] Conversely, if the drill insertion stops midway through excavating the cortical bone, screws and other fasteners cannot be properly installed, resulting in a decrease in bone fixation strength.

[0007] In view of the above, the present invention aims to provide a drill adjustment system that allows for easy and precise control of the drill insertion direction and depth when drilling holes in bone. [Means for solving the problem]

[0008] To achieve this objective, the present invention provides a drill adjustment system comprising: a drill for drilling a pilot hole in bone; a longitudinally shaped drill sleeve having a first through hole through which the drill passes, and having a first tip surface on the bone side and a first base surface opposite thereto; and a fixing device installed on the shaft of the drill and movable and fixable along the axial direction of the drill, wherein the fixing device has a second base surface opposite to a second tip surface that contacts the first base surface of the drill sleeve, and a second base surface having one or more opposing openings and a longitudinal shaft through which the drill passes The invention is characterized by comprising: a cylindrical member having a through hole; a recess member having a recess attached to the opening of the cylindrical member so as not to move with respect to the axial direction of the longitudinal axis, having a first contact surface that is close to the drill, and the upper part of the first contact surface being open; a head member that fits into the recess member and is movable relative to the recess member in a direction perpendicular to the longitudinal axis; a pusher member connected to the head member, movable in the depth direction of the recess of the recess member, and having a second contact surface that contacts the drill; and a fixing member that connects the pusher member to the head member.

[0009] In the present invention, the recessed material and the head member are connected by a screw-type structure, and either the recessed material or the head member is immobile around a rotation axis perpendicular to the longitudinal axis of the cylindrical member, and the pusher member is rotatably connected to the head member around the rotation axis.

[0010] The present invention is characterized by having a handle portion for screwing the head member into the recessed material.

[0011] In the present invention, the cylindrical member is characterized by having a first outer peripheral surface that is tapered on the contact surface side and a second outer peripheral surface on the base end side.

[0012] In the present invention, the cylindrical member comprises a slide member that is movable by a predetermined amount in the axial direction of the longitudinal axis relative to the cylindrical member, having a support surface located between the first outer peripheral surface and the second outer peripheral surface, a fixing hole formed in the first outer peripheral surface for receiving at least one pin, a pin fixed in the fixing hole and protruding from the first outer peripheral surface, a third through hole fitted to the first outer peripheral surface, a third tip surface that contacts the first base end surface of the drill sleeve, a third base end surface opposite to the third tip surface, and an elongated hole for receiving at least one of the pins, and having a fourth through hole fitted to the first outer peripheral surface and being elastically deformable and in contact with the third base end surface of the slide member and the support surface of the cylindrical member, wherein the slide member is characterized in that, due to the biasing force of the damper member, the third tip surface protrudes further toward the tip than the second tip surface of the cylindrical member.

[0013] The present invention provides a cover member which is an elongated member located outside the slide member and the damper member and has a fifth through hole, has a length that covers the damper member, and has at least one fixing through hole for receiving the pin, wherein the fourth tip surface located on the tip side of the cover member is located closer to the base end than the third tip surface of the slide member.

[0014] In the present invention, the damper member is characterized in that it is adjusted to an elastic force such that the fixing device does not move under its own weight when the fixing device is facing downwards with its second front end surface facing downwards. [Effects of the Invention]

[0015] According to the drill adjustment system of the present invention, by having the above configuration, when drilling a hole in a bone, the insertion direction and depth of the drill can be easily and accurately controlled.

Brief Description of the Drawings

[0016] [Figure 1] Exploded perspective view showing the first embodiment of the present invention. [Figure 2] Explanatory side view of the fixing device. [Figure 3] Explanatory front view showing the main part of the fixing device. [Figure 4] Perspective view showing the cylindrical member. [Figure 5] Perspective view showing the concave member. [Figure 6] Explanatory view showing the starting state of use of the drill adjustment system of the first embodiment. [Figure 7] Side view showing the fixing device in the second embodiment of the present invention. [Figure 8] Explanatory view showing the starting state of use of the drill adjustment system of the second embodiment. [Figure 9] Side view showing the fixing device in the third embodiment of the present invention. [Figure 10] Perspective view showing the cylindrical member. [Figure 11] Perspective view showing the slide member. [Figure 12] Side view showing the fixing device in the fourth embodiment of the present invention. [Figure 13] Perspective view showing the cylindrical member. [Figure 14] Explanatory side view showing the slide member. [Figure 15] Side view showing the fixing device with the slide member removed. [Figure 16] Side view showing the fixing device in the fifth embodiment of the present invention. [Figure 17] Side view showing the fixing device with the cover member removed. [Figure 18] Perspective view showing the cylindrical member. [Figure 19]A perspective view showing the sliding component. [Figure 20] A perspective view showing the cover component. [Figure 21] A plan view showing a modified example of the head component. [Figure 22] An explanatory diagram showing the inclination angle of the handle portion of the head component. [Figure 23] An explanatory diagram showing the usage state of the drill adjustment system of the fifth embodiment. [Figure 24] An explanatory diagram showing an example of how to use the slide scale. [Figure 25] An explanatory diagram showing other uses for the slide scale section. [Figure 26] A diagram showing a modified version of the head component. [Figure 27] A descriptive front view of a fixed device. [Modes for carrying out the invention]

[0017] A first embodiment of the present invention will be described with reference to the drawings. The drill adjustment system of the first embodiment comprises a drill 1, a drill sleeve 2, and a fixing device 3, as shown in Figure 1.

[0018] The drill 1 comprises, in order along its longitudinal direction, a tip portion 4, a shaft portion 5, and a base portion 6. Furthermore, the shaft portion 5 is provided with a helical groove portion 7 and a scale portion 8.

[0019] The tip portion 4 has a blade (not shown). The helical groove portion 7 has a helical groove (not shown) for smoothly discharging chips cut off by the blade of the tip portion 4. The scale portion 8 displays numerical values ​​at predetermined intervals for checking the insertion depth of the drill 1. The base end is connected to a drilling device (not shown).

[0020] The drill sleeve 2 is formed in a longitudinal cylindrical shape and has a first through-hole 9 through which the drill 1 passes. The tip of the drill sleeve 2 that faces the bone is the first tip surface 10, and the side opposite the first tip surface 10 (opposite side in the longitudinal direction) is the first base end surface 11.

[0021] Next, the configuration of the fixing device 3 will be described. As shown in Figures 1 and 2, the fixing device 3 comprises a cylindrical member 12, a recessed member 13, and a head member 14. Furthermore, the recessed member 13 and the head member 14 are assembled as shown in Figure 3, and a pusher member 15 is provided inside them.

[0022] As shown in Figures 1 and 4, the cylindrical member 12 has a second tip surface 16 on the side that contacts the first base end surface 11 of the drill sleeve 2, and a second base end surface 17 on the side opposite the second tip surface 16 (opposite side in the longitudinal direction).

[0023] Furthermore, as shown in Figure 4, the cylindrical member 12 includes an opening 18 and a longitudinal shaft 19. The longitudinal shaft 19 has a second through-hole 20 through which the drill 1 passes. The opening 18 is oriented perpendicular to the axis of the longitudinal shaft 19, and the recessed material 13 is inserted into it.

[0024] The outer diameter of the tip of the cylindrical member 12 is formed to be larger than the outer diameter of the drill 1. Specifically, it is preferable that it is formed to be about 0.05 to 0.2 mm larger than the diameter of the drill 1.

[0025] The recessed member 13 is attached to the opening 18 of the cylindrical member 12, thereby making it immovable in the axial direction of the longitudinal axis 19.

[0026] As shown in Figure 5, the recessed member 13 comprises an exposed portion 21 that is exposed from the cylindrical member 12 and a housing shaft portion 22 that is housed inside the cylindrical member 12. A spiral ridge 23 is formed on the outer circumference of the housing shaft portion 22, and a recess 24 is formed in the axial direction of the housing shaft portion 22, with the end opposite the exposed portion 21 being open. The bottom of the recess 24, which is the end on the exposed portion 21 side, is a first contact surface 25 that contacts the drill.

[0027] As shown in Figure 3, the head member 14 comprises a cylindrical body portion 26 and a handle portion 27 extending radially from the body portion 26. The head member 14 is screwed into the housing shaft portion 22 of the recessed material 13.

[0028] A fixing member 29 is inserted into the head through-hole formed in the center of the main body 26. The fixing member 29 fixes the plunger member 15 and connects the plunger member 15 to the head member 14.

[0029] In this configuration, the fixing member 29 is rotatable relative to the head member 14, and the rotation of the head member 14 does not affect the plunger member 15. The plunger member 15 has a second contact surface 30 that contacts the drill.

[0030] When using the first embodiment with the above configuration, as shown in Figure 6, first, check the scale portion 8 of the drill 1 and fix the fixing device 3 at the desired scale position. The fixing device 3 can be easily fixed to the drill 1 by rotating the head member 14.

[0031] In this state, as the drill 1 rotates and drills into the bone, the base end of the drill sleeve 2 eventually comes into contact with the tip of the cylindrical member 12 of the fixing device 3, thereby restricting the amount of drill 1 drills into the bone.

[0032] At this time, the dimension a of the drill 1 extending from the drill sleeve 2 matches the value of the scale on the scale section 8 to which the fixing device 3 is fixed, and therefore corresponds to the drilling amount by the drill 1. In other words, in this embodiment, by fixing the fixing device 3 at the 35 mm position on the scale section 8 of the drill 1, the drilling amount is controlled to 35 mm.

[0033] Furthermore, since the fixing device 3 is fixed to the drill 1 by being clamped between the recessed material 13 and the plunger member 15, the fixed state between the drill 1 and the cylindrical member 12 can be firmly maintained even if the outer diameter of the drill 1 is changed.

[0034] Next, a second embodiment of the present invention will be described. The drill adjustment system of the second embodiment includes a fixing device 31 that is partially different from the fixing device 3 of the drill adjustment system of the first embodiment. Furthermore, a drill sleeve 32 (see Figure 8) connected to a bone plate V (see Figure 8) is used, as will be described later. The other configurations are the same as those of the drill adjustment system of the first embodiment. Therefore, for configurations in the second embodiment that are the same as those in the first embodiment, the same reference numerals used in the figure showing the first embodiment will be used, and their descriptions will be omitted.

[0035] In the second embodiment, as shown in Figure 7, the fixing device 31 comprises a cylindrical member 33 having a first outer peripheral surface 34 and a second outer peripheral surface 35. The first outer peripheral surface 34 has a smaller diameter than the second outer peripheral surface 35, and a step is formed at the boundary between the first outer peripheral surface 34 and the second outer peripheral surface 35.

[0036] Figure 8 shows the usage state of the fixation device 31 in the second embodiment. In Figure 8, the symbol W represents bone, and the symbol V represents a bone plate.

[0037] As shown in Figure 8, the first tip surface 36 of the drill sleeve 32 is connected to the bone plate V. The bone plate V is used to fix bone fragments. The bone plate V has one or more holes H, and the drill sleeve 32 may be connected to each of the holes H.

[0038] When the drill sleeve 32 is connected to the bone plate V, the first outer peripheral surface 34 of the cylindrical member 33 has a smaller diameter than the second outer peripheral surface 35, thereby reducing interference between the cylindrical member 33 and its surroundings.

[0039] Note that the axial pressure during drilling differs depending on the size of the pilot hole being drilled, with larger pilot holes resulting in higher axial pressure. To prevent the fixing device 31 from moving due to the axial pressure applied during drilling, the pusher member 15 should be pressed against the drill 1 with greater force. However, considering manual fixing, a drill diameter of 8 mm or less is preferable.

[0040] Furthermore, while it is sometimes necessary to adjust the protrusion of the tip 4 of drill 1 from the bone W, it can be difficult to determine in advance how many millimeters to drill. When drill 1 hits the cortical bone on the deeper side, the bone suddenly hardens, which can be felt by touch. This can also be confirmed with X-rays, etc.

[0041] Next, a third embodiment of the present invention will be described. The drill adjustment system of the third embodiment includes a fixing device 37 that is partially different from the fixing devices 3 and 31 of the drill adjustment systems of the first and second embodiments. The other configurations are the same as those of the drill adjustment systems of the first and second embodiments, so for the third embodiment, the same components as those of the first and second embodiments will be denoted by the same reference numerals used in the figures showing the first and second embodiments, and their descriptions will be omitted.

[0042] As shown in Figure 9, the fixing device 37 in the third embodiment includes a cylindrical member 38, a sliding member 39, and a damper member 40.

[0043] As shown in Figure 10, the cylindrical member 38 has a support surface 43 located between the first outer peripheral surface 41 and the second outer peripheral surface 42. At least one (three in this embodiment) fixing holes 44 are formed in the first outer peripheral surface 41. A pin 45 (see Figure 9) is fixed to each fixing hole 44. Each pin 45 protrudes from the first outer peripheral surface 41.

[0044] As shown in Figure 11, the slide member 39 includes a third through hole 46, a third tip surface 47, a third base end surface 48 located on the opposite side of the third tip surface 47, and elongated holes 49 corresponding to each pin 45.

[0045] The slide member 39 has its first outer peripheral surface 41 of the cylindrical member 38 inserted through the third through hole 46, and is slidable relative to the cylindrical member 38 in the longitudinal direction of the first outer peripheral surface 41. The third tip surface 47 of the slide member 39 contacts the first base end surface 11 of the drill sleeve 2.

[0046] In this embodiment, the damper member 40 employs a so-called coil spring, and as shown in Figure 9, it has a fourth through hole (the space inside the coil spring) that is fitted onto the first outer peripheral surface 41 of the cylindrical member 38, with one end contacting the third base end surface 48 of the slide member 39 and the other end contacting the support surface 43 of the cylindrical member 38. The damper member 40 is elastically deformable and, as shown in Figure 9, biases the third tip surface 47 of the slide member 39 to protrude further forward than the second tip surface 51 of the cylindrical member 38.

[0047] With the fixing device 37 of the third embodiment having the above configuration, it becomes easy to keep the drilling amount of the drill 1 constant or to make fine adjustments. For example, if the drill 1 itself is equipped with a scale 8 that can read the protrusion distance from the contact surface of the drill sleeve 2 and the amount to be drilled is determined in advance, the position of the second tip surface 51 of the cylindrical member 38 can be fixed at a position that matches the amount to be drilled.

[0048] On the other hand, it is difficult to adjust how many more millimeters to excavate during surgery. However, with the configuration of the third embodiment, it becomes possible to excavate only the gap between the second tip surface 51 of the cylindrical member 38 and the third tip surface of the slide member 39. Furthermore, if a scale is provided on the slide member 39, fine adjustments can be made by checking the scale.

[0049] In the fixed device 37 shown in Figure 9, the head member 52 and the handle portion 53 are separate components, and the handle portion 53 is fixed to the head member 52 by welding or the like. This facilitates the processing of the handle portion 53, but it is not limited to this, and the head member 52 and the handle portion 53 may be integrally molded.

[0050] Furthermore, the length of the elongated hole 49 is usually adjusted so that the slide member 39 can move until the third end surface 47 is in the same position as the second end surface 51, but this is not limited to this. That is, the slide member 39 may be movable until the second end surface 51 is exposed from behind the third end surface 47, or the slide member 39 may be movable until the third end surface 47 is positioned in front of the second end surface 51.

[0051] Furthermore, in order to reliably drill the pilot hole diameter with the drill 1, the amount of movement of the sliding member 39 must be greater than or equal to the length of the tip 4 of the drill 1 (greater than or equal to L in Figure 1, preferably 2 mm or more).

[0052] Furthermore, the support surface 43 of the cylindrical member 38 does not necessarily have to be a plane perpendicular to the long axis; it can be a curved surface or the like, as long as it can contact the damper member 40.

[0053] Next, a fourth embodiment of the present invention will be described. The drill adjustment system of the fourth embodiment includes a fixing device 54 that is partially different from the fixing device 37 of the third embodiment. The same configuration as the drill adjustment systems of the first and third embodiments will not be described.

[0054] As shown in Figure 12, the fixing device 54 in the fourth embodiment includes a cylindrical member 55, a sliding member 56, and a damper member 57 (see Figure 15).

[0055] As shown in Figure 13, the cylindrical member 55 has a support surface 60 located between the first outer peripheral surface 58 and the second outer peripheral surface 59, and furthermore, a rear end surface 61 is formed at the base end of the second outer peripheral surface 59, which is stepped in the outer diameter direction.

[0056] At least one (three in this embodiment) fixing holes 62 are formed in the second outer peripheral surface 59. A pin 63 (see Figure 12) is fixed to each fixing hole 62. Each pin 63 protrudes from the second outer peripheral surface 59.

[0057] As shown in cross-sectional view in Figure 14, the slide member 56 includes a third through hole 64, a third tip surface 65, a third base end surface 66, and elongated holes 67 corresponding to each pin 63. The third base end surface 66 is formed on the inner circumference of the slide member 56.

[0058] The second outer surface 59 of the cylindrical member 55 is inserted through the third through hole 64 of the slide member 56, allowing it to slide freely in the longitudinal direction of the second outer surface 59 relative to the cylindrical member 55. The third tip surface 65 of the slide member 56 contacts the first base end surface 11 of the drill sleeve 2.

[0059] As shown in Figure 15 with the slide member 56 removed, the damper member 57 has a fourth through hole 68 that is fitted onto the first outer peripheral surface 58 of the cylindrical member 55, with one end in contact with the third base end surface 66 (see Figure 14) inside the slide member 56, and the other end in contact with the support surface 60 of the cylindrical member 55.

[0060] The damper member 57 is elastically deformable and biases the third end surface 65 of the slide member 56 to protrude further toward the tip than the second end surface 69 of the cylindrical member 55.

[0061] As described above, in the fixing device 54 of the fourth embodiment, the fixing hole 62 is formed on the second outer peripheral surface 59 of the cylindrical member 55. The third base end surface 66 of the slide member 56 is positioned on the tip side of the elongated hole 67. This is based on the assumption that the slide member 56 will move until the third base end surface 66 of the slide member 56 contacts the second tip surface 69 of the cylindrical member 55.

[0062] The amount of movement of the slide member 56 can be adjusted by the length of the elongated hole 67, as well as by controlling the distance until the third base end face 66 of the slide member 56 and the second front end face 69 of the cylindrical member 55 come into contact, and the distance until the rear end face 70 of the slide member 56 and the rear end face 61 of the second outer peripheral surface 59 of the cylindrical member 55 come into contact.

[0063] Furthermore, as shown in Figure 12, by forming flat surfaces 71 and 72 on the upper surfaces of the slide member 56 and the cylindrical member 55, interference with the handle portion 73 can be prevented, as well as interference with the fingers or other hands operating the handle portion 73, thereby improving operability.

[0064] Furthermore, as shown in Figure 12, by providing a scale 74 adjacent to the elongated hole 67 of the slide member 56, the amount of movement of the slide member 56 can be easily confirmed.

[0065] Next, a fifth embodiment of the present invention will be described. The drill adjustment system of the fifth embodiment includes a fixing device 75 that differs in part from that of the third and fourth embodiments. The same configuration as that of the drill adjustment systems of the first and fourth embodiments will not be described.

[0066] As shown in Figures 16 and 17, the fixing device 75 in the fifth embodiment includes a cylindrical member 76, a sliding member 77, a damper member 78, and a cover member 79.

[0067] As shown in Figure 18, the cylindrical member 76 has a first outer peripheral surface 80, a second outer peripheral surface 81, and a support surface 82 located between the two outer peripheral surfaces 80 and 81. Furthermore, the side of the cylindrical member 76 that contacts the first base end surface 11 of the drill sleeve 2 is designated as the second tip surface 83.

[0068] At least one (three in this embodiment) fixing holes 84 are formed in the first outer peripheral surface 80. A pin 85 (see Figure 17) is fixed to each fixing hole 84. Each pin 85 protrudes from the first outer peripheral surface 80.

[0069] As shown in Figure 19, the slide member 77 includes a third through hole 86, a third tip surface 87, a third base end surface 88 located on the opposite side of the third tip surface 87, and elongated holes 89 corresponding to each pin 85.

[0070] As shown in Figure 16, the cover member 79 is mounted on the outside of the slide member 77. As shown in Figure 20, the cover member 79 has a fifth through hole 90, a fourth front end surface 91, a fourth base end surface 92, and a fixing through hole 93 through which the pin 85 passes.

[0071] The fixing through-hole 93 is formed to correspond to the outer diameter of the pin 85. As a result, the cover member 79 is fixed to the cylindrical member 76 by the pin 85 passing through the fixing through-hole 93 without obstructing the movement of the slide member 77.

[0072] In this case, as shown in Figure 16, the damper member 78 is covered by the cover member 79. Also, the fourth tip surface 91 located on the tip side of the cover member 79 is located closer to the base end than the third tip surface 87 of the slide member 77.

[0073] In the fifth embodiment, as described above, by providing the cover member 79, the damper member 78 is hidden and the drive unit of the slide member 77 is covered, thus preventing contamination of the fixing device 75.

[0074] Furthermore, when the slide member 77 is pushed out to its maximum extent by the biasing force of the damper member 78, setting the elongated hole portion 89 of the slide member 77 to be covered by the cover member 79 improves the contamination prevention performance.

[0075] Furthermore, eliminating gaps between the cover member 79 and the slide member 77, between the slide member 77 and the cylindrical member 76, and between the cover member 79 and the cylindrical member 76 will further improve the prevention of contamination.

[0076] Furthermore, if the cover member 79 is joined to the cylindrical member 76 without any gaps by welding or the like, or if the pin 85 and the cover member 79 are joined without any gaps by welding or the like, contamination can be reliably prevented.

[0077] In the fifth embodiment, the cover member 79 completely covers the second outer peripheral surface 81 of the cylindrical member 76, but this is not the only example. For instance, although not shown, the cover member may be formed to cover part of the second outer peripheral surface 81.

[0078] Furthermore, as shown in Figure 21, the handle portion 94 of the head member 14 may be made relatively long. This makes it possible to increase the fastening torque applied to the head member 14, allowing for a more secure fixation.

[0079] On the other hand, if the handle is made too long, it may interfere with the surroundings. Therefore, as shown in Figure 22, when the fixing device 75 is fixed to the drill 1, the inclination angle θ of the handle 27 is preferably set to 45 degrees or less, more preferably 20 degrees or less, and if possible, 10 degrees or less. This angle can be set by adjusting the height position of the plunger member 15 and the handle 27. Furthermore, this angle setting is particularly effective when a long handle 94 is provided (specifically, when the total length of the handle 94 is 15 mm or more).

[0080] Next, a characteristic use example according to the fifth embodiment will be described. As shown in Figure 23A, with the drill 1 stopped on the opposite side of the cortex, we want to perform additional drilling by the amount of movement of the slide member 77. Therefore, as shown in Figure 23B, with the slide member 77 protruding, the fixing device 75 is fixed at a position where the third tip surface 87 of the slide member 77 abuts against the first base end surface 11 of the drill sleeve 32.

[0081] In this case, if the damper member 78 has enough initial elasticity to prevent the slide member 77 from moving due to the weight of the fixing device 75, the slide member 77 will not move easily, making it easier to adjust the fixing device 75 and allowing the fixing operation to be performed with one hand. Conversely, if the elasticity of the damper member 78 is too strong, it will be necessary to apply excessive axial pressure, so elasticity that can be pressed with a finger is desirable.

[0082] Then, by continuing the excavation, when the state shown in Figure 23C is reached, it means that the additional excavation was performed by the amount of movement of the slide member 77. Since the thickness of the cortical bone varies depending on the location, it is preferable that the amount of movement of the slide member 77 is adjusted in advance. Also, since the remaining amount of movement of the slide member 77 can be determined from the amount of protrusion of the slide member 77, it can be easily used by the operator consciously reducing the axial pressure.

[0083] Furthermore, referring to Figure 21, a control pin 85 may be provided to prevent the fixing device 75 from disassembling and to limit the rotation of the head member 14. The amount by which the head member 14 is loosened can be adjusted by interference from the control pin 95. This prevents the head member 14 from becoming excessively loose and improves operability. For ease of assembly, it is preferable to provide multiple holes in the head member 14 for attaching this control pin 85, so that the rotation of the head member 14 can be limited to within half a turn.

[0084] Furthermore, referring to Figure 21, it is preferable that the amount of movement S of the slide member 77 is adjusted according to the part of use. However, if the amount of movement S is too long, it may be undesirable in use, so it is preferable that the amount of movement S is 10 mm or less.

[0085] Furthermore, regarding the relationship between the second tip surface 83, the third tip surface 87, and the fourth tip surface 91, when the slide member 77 is protruding, the third tip surface 87 must be at the furthest tip position. When the damper member 78 is compressed and the slide member 77 moves toward the base end, and the fourth tip surface 91 is in contact with the first base end surface 11, the distance between the third tip surface 87 and the fourth tip surface 91 coincides with the amount that can be excavated, making it easier to confirm the amount of excavation.

[0086] Furthermore, if the slide scale portion 97, described later, is located at the tip of the slide member 77, the distance can be confirmed. However, in this case, the third tip surface 87 must be the same as the fourth tip surface 91, or located on the base end side.

[0087] Here, we will explain the use of the slide scale portion 97 provided at the tip of the slide member 77. In the example of using the slide scale portion 97 described below, the travel distance of the slide member 77 is assumed to be 8 mm, and the slide scale portion 97 is provided at a pitch of 2 mm.

[0088] To achieve a drilling depth of 2 mm, as shown in Figure 24A, drilling by the drill 1 is stopped, and as shown in Figure 24B, the fixing device 75 is fixed at the position where the third tip surface 87 contacts the first base end surface 11. Further drilling is performed, and when the slide scale 97 reaches the position shown in Figure 24C, it can be confirmed that 2 mm has been drilled and the remaining drilling depth is 6 mm.

[0089] To achieve a drilling depth of 6 mm, with drilling stopped by drill 1 as shown in Figure 24A, the fixing device 75 is fixed with the slide scale portion 97 pushed in by 2 mm, as shown in Figure 25A. Further drilling will cause the slide member 77 to retract and stop, as shown in Figure 25B, at which point the drilling depth will be 6 mm.

[0090] If you want to drill an additional 2 mm from the state shown in Figure 25B, you can easily adjust the drilling amount by holding the drill 1 in this state, moving the fixing device 75 backward by one division (2 mm) on the slide scale 97, and then re-fixing it.

[0091] In the embodiments described above, the handle portion 27 of the head member 14 is shown to be integrally provided, but this is not the only option. For example, as shown in Figure 26, a handle member 100 that can be detached from the main body portion 99 of the head member 14 may be provided. This allows the handle member 100 to be removed when fixing is not required, thereby miniaturizing the fixing device 101 and reducing interference with the surroundings.

[0092] Furthermore, as shown in Figure 27, it is preferable to reduce the diameter D of the circumscribed circle of the fixing device 75 when viewed from the front. If the diameter D is too large, it may interfere with the surroundings or become too heavy, which may hinder the smooth rotation of the drill.

[0093] Furthermore, if the fixing device 75 has an overall length X (see Figure 21) that is too long, the drill 1 will also need to be long, which is undesirable. On the other hand, if the overall length X is too short, the handle portion 94 will interfere with the drill sleeve 32, which is also undesirable.

[0094] Considering the above points, for the fixed device 75, the diameter D of the circumscribed circle is preferably about 10 mm ≤ D ≤ 30 mm, and the total length X is preferably 15 mm ≤ X ≤ 45 mm.

[0095] Furthermore, the material of the fixing device 75 can be a metal such as stainless steel, titanium, titanium alloy, aluminum, or aluminum alloy, or a resin such as PEEK. [Explanation of Symbols]

[0096] W…Bone 1…Drill 2.32…Drill Sleeve 3, 31, 37, 54, 75, 101… Fixed devices 5...Drill shaft 9…First through hole 10,36...1st tip surface 11...First proximal surface 12, 33, 38, 55, 76…Cylindrical members 13…Recessed material 14…Head component 15…Pusher component 16,69,83…Second tip surface 17…Second base end surface 18…Opening 19... Long axis 20...Second through hole 24…recess 25...1st contact surface 27,53,7394,100…Handle section 29… Fixing member 30…Second contact surface 34,41,58,80…First outer peripheral surface 35,42,59,81…Second outer peripheral surface 39, 56, 77… Sliding parts 40, 57, 78… Damper components 43,60,82…support surface 44,62,84…fixing hole 45, 63, 85… pins 46, 64, 86… Third through hole 47,65,87…Third tip surface 48,66,88...Third base end surface 49,67,89…Long hole part 68...Fourth through hole 79... Cover component 90... Fifth through hole 91…4th tip surface 93…Fixing through hole

Claims

1. A drill adjustment system comprising: a drill for drilling a pilot hole in bone; a longitudinally shaped drill sleeve having a first through-hole through which the drill passes, and having a first tip surface on the bone side and a first base surface opposite to it; and a fixing device installed on the shaft of the drill, which is movable and fixed along the axial direction of the drill, The fixed device A cylindrical member having a second base end face that contacts the first base end face of the drill sleeve and is opposite to the second tip face, and having a second through hole comprising one or more opposing openings and a longitudinal axis through which the drill passes, A recessed member is provided, which is attached to the opening of the cylindrical member so as not to move with respect to the axial direction of the longitudinal axis, has a first contact surface that is close to the drill, and has a recess in which the upper part of the first contact surface is open. A head member that fits into the recessed material and is movable relative to the recessed material in a direction perpendicular to the longitudinal axis, A pusher member is connected to the head member, is movable in the depth direction of the recess of the recess material, and has a second contact surface that contacts the drill, A fixing member for connecting the pusher member to the head member, A drill adjustment system characterized by comprising the following features.

2. The recessed material and the head member are connected by a screw structure. Either the recessed material or the head member is unable to rotate about a rotation axis perpendicular to the longitudinal axis of the cylindrical member. The drill adjustment system according to claim 1, characterized in that the plunger member is rotatably connected to the head member around the rotation axis.

3. The drill adjustment system according to claim 2, characterized in that it has a handle portion for screwing the head member into the recessed material.

4. The drill adjustment system according to claim 3, characterized in that the cylindrical member has a first outer peripheral surface that is tapered on the contact surface side and a second outer peripheral surface on the base end side.

5. The cylindrical member has a support surface located between the first outer surface and the second outer surface, a fixing hole formed in the first outer surface for receiving at least one pin, and a pin fixed in the fixing hole and protruding from the first outer surface. A slide member having a third through hole fitted onto the first outer surface, a third tip surface that contacts the first base end surface of the drill sleeve, a third base end surface opposite to the third tip surface, and an elongated hole for receiving at least one of the pins, and being movable by a predetermined amount in the axial direction of the longitudinal axis relative to the cylindrical member, The present invention comprises an elastically deformable damper member having a fourth through-hole fitted onto the first outer peripheral surface, and contacting the third base end face of the slide member and the support surface of the cylindrical member, The drill adjustment system according to claim 4, characterized in that the sliding member has a third tip surface that protrudes further in the tip direction than the second tip surface of the cylindrical member due to the biasing force of the damper member.

6. A cover member is provided, which is located outside the slide member and the damper member, has a fifth through hole, has a length that covers the damper member, and has at least one fixing through hole for receiving the pin, The drill adjustment system according to claim 5, characterized in that the fourth tip surface located on the tip side of the cover member is located on the base end side of the third tip surface of the slide member.

7. The drill adjustment system according to claim 5 or 6, characterized in that the damper member is adjusted to an elastic force such that the fixing device does not move under its own weight when the fixing device is facing downwards with its second tip surface facing downwards.

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