Endoscopic surgical drill cover

Abstract

To provide a cover suitable for an endoscopic surgical drill.SOLUTION: Provided is a cover 20 which is mounted on an endoscopic surgical drill 10 including a tube 11 and a rotary tool 12 having a rotary shaft 13 extending in the axial direction, one axial side of which is inserted into the tube 11, and a cutting portion 14 formed on the other end of the rotary shaft 13, and which includes: a body portion 22 extending in an extension direction substantially parallel to the axial direction of the rotation shaft 13 when attached to the drill 10; a base portion 21 provided at one end of the body portion 22 in the extension direction and configured to be attachable to and detachable from the tube 11 by snap-fitting; and a tip portion 23 extending from the other end of the body portion 22 in the extension direction in a direction intersecting the extension direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a cover for an endoscopic surgical drill. [Background technology]

[0002] In the medical field, a drill used in surgical operations is known (see Patent Document 1). The drill has a cutting edge for cutting the affected area. The drill can be used for general surgical operations. The drill is provided with an optional cover (attachment with guard bar) that covers part of the cutting edge, which can be selected depending on the application. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 022884 Summary of the Invention [Problem to be solved by the invention]

[0004] FIG. 12 is a schematic diagram showing a conventional endoscopic surgical drill. FIG. 12 shows a conventional endoscopic surgical drill 100 (hereinafter simply referred to as drill 100) used in endoscopic surgery (PELD (PED)). The drill 100 shown in FIG. 12 is inserted into the body together with an endoscope in surgery for a herniated disc or the like, and is used to drill an affected area (bone B). As shown in FIG. 12, the drill 100 includes a tube 110 and a rotary tool 120. The rotary tool 120 includes a rotary shaft 130 and a cutting edge 140. The drill 100 is configured to be insertable into a cylindrical instrument (operating tube) together with an endoscope (videoscope), forceps, etc., and is configured differently from drills used in general surgical operations.

[0005] The drill 100 is inserted into the patient's body through the operator tube. During surgery, the drill 100 is first displaced together with the operator tube in the axial direction X of the rotation shaft 130, bringing the cutting edge 140 into contact with the bone B. The drill 100 is then moved in the direction Y along the bone B, and the cutting edge 140 scrapes (grinds or cuts) the bone B.

[0006] In the drill 100, the cutting edge 140 generates a force acting in the axial direction X due to the rotation of the cutting edge 140 itself, which may cause the cutting edge 140 to unintentionally come into contact with the nerve N. For this reason, the surgeon in charge of the surgery operates the drill 100 with great care to prevent the cutting edge 140 from coming into contact with the nerve N, which places a great physical and mental burden on the surgeon. To address this issue, it has been considered to use a cover that covers part of the cutting edge used in general surgical drills, but this has presented problems such as the risk of damaging the nerve if the cover itself unintentionally comes into contact with the nerve and impairing visibility of the affected area through an endoscope.

[0007] An object of the present disclosure is to provide a cover suitable for a drill for endoscopic surgery. [Means for solving the problem]

[0008] The cover for an endoscopic surgical drill disclosed herein is a cover to be attached to an endoscopic surgical drill that includes a tube, a rotating shaft that extends axially and has one axial side inserted into the tube, and a rotary tool that has a cutting edge formed at the end of the other side of the rotating shaft, and includes a body that extends in an extension direction that is approximately parallel to the axial direction of the rotating shaft when attached to the drill, a base that is provided at one end of the body in the extension direction and is configured to be attachable and detachable to the tube by snap fitting, and a tip that extends from the other end of the body in the extension direction in a direction intersecting the extension direction. [Effects of the Invention]

[0009] According to the cover for the endoscopic surgical drill disclosed herein, the base is removably attached to the tube by snap-fitting, thereby preventing contact between the cutting edge and nerves and ensuring visibility through the endoscope without the cover itself damaging the nerves. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing an endoscopic surgical drill equipped with a cover according to the present disclosure. [Figure 2] FIG. 2 is a schematic perspective view showing the cover of the present disclosure. [Figure 3] FIG. 3 is a schematic side view showing a first embodiment of the cover of the present disclosure. [Figure 4] FIG. 4 is a schematic diagram of the cover of the present disclosure as viewed from one side in the stretching direction. [Figure 5] FIG. 5 is an explanatory diagram of the cover of the present disclosure being removed. [Figure 6] FIG. 6 is a schematic side view showing a second embodiment of a cover according to the present disclosure. [Figure 7] FIG. 7 is a schematic side view showing a third embodiment of a cover according to the present disclosure. [Figure 8] FIG. 8 is a schematic side view showing a fourth embodiment of a cover according to the present disclosure. [Figure 9] FIG. 9 is a schematic diagram showing a conventional drill for endoscopic surgery.

[0011] <Details of the embodiment of the present disclosure> Hereinafter, embodiments of the present disclosure will be described.

[0012] [Regarding drills and covers for endoscopic surgery] Fig. 1 is a schematic diagram showing an endoscopic surgical drill equipped with a cover according to the present disclosure, showing a drill 10 used in endoscopic surgical procedures (PELD (PED)) and a cover 20 attached to the drill 10.

[0013] (About the drill) The drill 10 shown in FIG. 1 is a surgical tool for endoscopic surgery, and is inserted into the body together with an operating tube and used to drill an affected area (bone B) in surgery such as for a herniated disc (endoscopic spinal surgery). As shown in FIG. 1, the drill 10 includes a tube 11 and a rotary tool 12. The drill 10 shown in FIG. 1 has a similar configuration to a conventional drill (see the conventional drill 100 shown in FIG. 12). In other words, the cover 20 of the present disclosure can be applied to the conventional drill 100.

[0014] The tube 11 is a tubular member having a substantially cylindrical or substantially conical shape. The tube 11 may be configured to be extendable and retractable in the axial direction (telescopic tube) and may be flexible. The rotary tool 12 includes a rotary shaft 13 and a cutting portion 14. The rotary shaft 13 is a cylindrical shaft having a central axis C0. One axial end of the rotary shaft 13 is connected to a drive source (motor, etc.) not shown, and is driven to rotate about the central axis C0. The cutting portion 14 is a blade (grinding blade or cutting blade) provided at the end of the other axial end of the rotary shaft 13, and rotates as the rotary shaft 13 rotates. The drill 10 is configured to be insertable into a cylindrical operating tube (not shown) together with an endoscope (videoscope), forceps, etc.

[0015] In endoscopic spinal surgery, the drill 10 is inserted into the patient's body through the operating tube. During surgery, the drill 10 is first displaced together with the operating tube in the axial direction X of the rotation shaft 13, bringing the cutting edge 14 into contact with the bone B. The drill 10 is then moved in direction Y along the bone B, and the cutting edge 14 scrapes (grinds or cuts) the bone B. In the drill 10, the cutting edge 14 generates a force acting in the axial direction X due to the rotation of the cutting edge 14 itself, which has the tendency to unintentionally approach a nerve N.

[0016] (About the cover) Fig. 2 is a schematic perspective view showing the cover 20 of the present disclosure. Fig. 3 is a schematic side view showing a first embodiment of the cover 20 of the present disclosure. In the following description, the cover 20 according to the first embodiment will also be referred to as the first cover 20A. Note that in the following description, when simply referring to the "cover 20," a common configuration will be described for the first cover 20A according to the first embodiment and the covers 20 according to the other embodiments (see the second cover 20B to the fourth cover 20D described later).

[0017] In this description, the extension direction of the cover 20 is defined (see FIG. 3 , and the same applies to FIGS. 6 to 10 ). As shown in FIG. 3 , when the cover 20 is attached to the drill 10, the extension direction of the cover 20 is approximately parallel to the axial direction of the central axis C0 of the rotary shaft 13 (hereinafter also referred to as the axial direction C0). Note that the extension direction of the cover 20 is allowed to have a slight inclination with respect to the axial direction C0 when attached to the drill 10. In this description, the direction perpendicular to the axial direction C0 is also referred to as the radial direction of the rotary tool 12 and the rotary shaft 13. In this description, in the axial direction C0 of the rotary tool 12, the side that is inserted into the tube 11 is referred to as one side of the axial direction C0, and the tip side (the cutting portion 14 side) of the rotary tool 12 is referred to as the other side of the axial direction C0. In this description, with regard to the extension direction of the cover 20, when the cover 20 is attached to the tube 11, the direction that coincides with one side of the axial direction C0 is also referred to as one side of the extension direction, and the direction that coincides with the other side of the axial direction C0 is also referred to as the other side of the extension direction. Note that the direction X shown in FIG. 1 is the other side of the axial direction C0 of the rotary tool 12.

[0018] As shown in Figure 1, the cover 20 is attached to the tube 11 of the drill 10. When attached to the drill 10, the cover 20 has a shape that covers part of the cutting portion 14 from the radially outer side and the other axial side. The part of the cutting portion 14 that is not covered by the cover 20 can directly face the affected bone B. The part of the cutting portion 14 that is covered by the cover 20 does not directly face the bone B or the nerve N present around the bone B.

[0019] As shown in Figures 1 to 3, the cover 20 comprises a body portion 22 that extends in an extension direction that is approximately parallel to the axial direction C0 of the rotation shaft 13 when attached to the drill 10, a base portion 21 that is provided at one end of the body portion 22 in the extension direction and is configured to be attachable and detachable to the tube 11 by snap fitting, and a tip portion 23 that extends from the other end of the body portion 22 in the extension direction in a direction intersecting the extension direction.

[0020] The cover 20 is made of resin. The cover 20 is disposable, does not require the effort of cleaning, and can be kept clean at all times. The cover 20 made of resin is lightweight, easy to manufacture even in complex shapes, easy to adjust the shape, and easy to mass-produce. Note that the cover 20 of the present disclosure may be partially or entirely made of a material other than resin, and may be partially or entirely made of, for example, metal.

[0021] The base 21 is a portion of the cover 20 that is attached to the drill 10. As shown in Figures 2 and 3, the base 21 has a pair of walls 24 and a fitting groove 25. The pair of walls 24 includes a first wall 24a and a second wall 24b, and the fitting groove 25 is formed between the first wall 24a and the second wall 24b.

[0022] The body portion 22 is a portion that is disposed radially outward of the rotating shaft 13 and the blade portion 14 when the base portion 21 is attached to the tube 11. The body portion 22 has an inner peripheral surface 26 that faces the outer peripheral surfaces of the rotating shaft 13 and the blade portion 14. The inner peripheral surface 26 has a shape that allows a gap to be secured between the inner peripheral surface 26 and the blade portion 14.

[0023] The tip portion 23 has an inner circumferential surface 27 and an outer circumferential surface 28. When the base portion 21 is attached to the tube 11, the inner circumferential surface 27 faces the outer circumferential surface and the axial end of the blade portion 14. The outer surface 28 faces mainly the nerve N adjacent to the bone B. The inner circumferential surface 27 has a shape that can ensure the necessary gap between it and the blade portion 14.

[0024] The cover 20 undergoes some deformation when the tip 23 comes into contact with the bone B and its surrounding area. Even if such deformation occurs, the cover 20 has sufficient rigidity to prevent the body 22 and tip 23 from coming into contact with the blade portion 14. The cover 20 ensures this rigidity by adjusting its shape and selecting an appropriate material.

[0025] (Details of the cover shape) 4 is a schematic diagram of the cover of the present disclosure as viewed from one side in the extension direction. As shown in FIGS. 2 and 4, fitting groove 25 has an opening that opens in a direction perpendicular to the extension direction when viewed from the extension direction. Fitting groove 25 having such a shape can embrace and hold tube 11 having a substantially cylindrical or substantially conical shape.

[0026] The first wall portion 24a and the second wall portion 24b of the fitting groove 25 are elastically deformable. Therefore, the base portion 21 (cover 20) can be attached to any tube 11 whose outer diameter is within a certain range. The cover 20 configured in this way can be attached to a tube 11 whose outer diameter changes in the axial direction (for example, a conical shape).

[0027] The base 21 in which the fitting groove 25 is formed has an opening 21a. The base 21 configured in this manner allows access to the tube 11 from the radially outside, and the tube 11 can be inserted into or removed from the fitting groove 25 through the opening 21a. Therefore, the cover 20 of the present disclosure can be easily attached to and detached from the drill 10.

[0028] 2 and 4, the first wall portion 24a and the second wall portion 24b have a shape in which the wall thickness tapers from the base side toward the tip side (toward the opening 21a) when viewed in cross section perpendicular to the extension direction. Therefore, the first wall portion 24a and the second wall portion 24b can be elastically deformed (bent) with less force toward the tip side, making it easier to widen the opening 21a. The base portion 21 configured in this way can be easily attached to the tube 11 because a large force is not required to fit the tube 11 into the fitting groove 25.

[0029] Furthermore, by increasing the wall thickness of the base side of the first wall portion 24a and the second wall portion 24b, the base portion 21 can provide a sufficient restraining force to the tube 11 fitted into the fitting groove 25. The base portion 21 configured in this manner can reliably hold the tube 11 fitted into the fitting groove 25. In other words, the base portion 21 has a structure that makes it easy to fit the tube 11 into the fitting groove 25 and makes it difficult for the tube 11 to come off once fitted into the fitting groove 25. Note that in the cover 20 of the present disclosure, the first wall portion 24a and the second wall portion 24b do not have to have a tapered shape.

[0030] The fitting groove 25 is formed to extend substantially parallel to the extension direction of the cover 20. Therefore, the cover 20 can be displaced in the axial direction C0 along the tube 11 with the tube 11 fitted in the fitting groove 25. The cover 20 having such a configuration can be temporarily attached to the tube 11, and then displaced in the axial direction C0 of the drill 10, thereby easily adjusting the gap between the inner circumferential surface 27 of the tip portion 23 and the cutting portion 14.

[0031] The cover 20 of the present disclosure has a structure (a so-called cantilever structure) in which only the base 21 is supported by the tube 11, and the tip 23 is not supported by the drill 10. In endoscopic surgery, surgery is performed while visually checking the affected area (bone B) and the cutting edge 14 with an endoscope, and with a cover 20 of this structure, the area in which the cover 20 blocks the field of view of the endoscope can be minimized, and visibility around the tip 23 can be ensured.

[0032] Fig. 5 is an explanatory diagram of the removal state of the cover of the present disclosure. As shown in Fig. 4, the opening 21a (fitting groove 25) formed in the base 21 is open in a direction that coincides with the protruding direction P (see arrow P in Fig. 4) of the tip 23 from the body 22 when viewed from the extension direction. The opening plane Q of the opening 21a is perpendicular to the protruding direction P of the tip 23.

[0033] As shown in Fig. 5, the cover 20 configured as described above can detach the base 21 (cover 20) from the tube 11 if the tip 23 unintentionally contacts the nerve N and a predetermined stress Z acts on the tip 23 when the drill 10 is displaced in the direction Y. Note that the predetermined stress Z is a stress of a magnitude that does not damage the nerve N. With this configuration, it is possible to reliably prevent damage to the nerve N due to contact with the cover 20 (tip 23).

[0034] In the cover 20 of the present disclosure, the cross-sectional area A1 of the body portion 22 is larger than the cross-sectional area A2 of the body portion 22 (A1>A2). In the cover 20 of the present disclosure, the size of the cross-sectional area of ​​the body portion 22 increases from the tip portion 23 side toward the base portion 21 side.

[0035] The cover 20 configured as described above has a narrower body 22 on the tip 23 side, thereby ensuring a gap between the cover 20 and the blade section 14, ensuring endoscopic visibility of the circumferential surface of the tip 23, and achieving a lightweight design. Furthermore, the cover 20 configured as described above has a thicker body 22 on the base 21 side, thereby ensuring the desired rigidity.

[0036] (Regarding the condition of the cover) When the drill 10 is used to drill the bone B, the cutting edge 14 tends to be displaced in a direction (X direction) approaching the nerve N. The drill 10 with the cover 20 attached can position the tip 23 between the cutting edge 14 and the nerve N. Therefore, the drill 10 with the cover 20 attached can reliably avoid contact between the cutting edge 14 and the nerve N even if the cutting edge 14 is unintentionally displaced in the X direction.

[0037] As described above, the cover 20 of the present disclosure, when attached to the drill 10, can sufficiently reduce the possibility of the cutting portion 14 coming into contact with the nerve N, thereby avoiding the risk of damaging the nerve N. The cover 20 of the present disclosure can be generally applied to drills 10 used in endoscopic surgery, regardless of the form of the tube 11. The cover 20 of the present disclosure is lightweight and can ensure visibility through an endoscope, so that the drill 10 can be used with the same feel when attached as when not attached.

[0038] (Regarding the first cover 20A) FIG. 3 shows a first cover 20A, which is a first embodiment of the cover 20 of the present disclosure. As shown in FIG. 3, in the first cover 20A, the outer surface 28 of the tip portion 23 is formed solely of a curved surface. When a first cover 20A having such a configuration is used, the tip portion 23 does not get caught on the surrounding tissue of the bone B or nerves N, and the nerves N are not damaged by contact with the tip portion 23. In the first cover 20A, the angle θ1 formed between the extension direction of the body portion 22 and the tangent direction at the other end of the tip portion 23 is approximately 90 degrees. In the first cover 20A attached to the tube 11, the tip portion 23 extends from the body portion 22 in a direction intersecting the axial direction C0 of the rotation shaft 13.

[0039] When the first cover 20A is attached to the drill 10, the tip 23 can cover approximately a semicircular portion of the cutting portion 14 when viewed from the axial direction. In this case, the remaining semicircular portion of the cutting portion 14 is exposed when viewed from the axial direction. Therefore, the drill 10 with the first cover 20A attached provides good visibility of the bone B through the cutting portion 14 and is easy to use. In other words, the first cover 20A has a structure that does not obstruct the field of view of the endoscope.

[0040] In the cover 20 of the present disclosure, the area of ​​the blade portion 14 covered by the tip portion 23 when viewed in the axial direction may be an area less than a semicircle of the blade portion 14. The area of ​​the blade portion 14 covered by the tip portion 23 is set appropriately in consideration of the field of view of the endoscope, operability, the risk of damaging the nerve N, and the like, as well as according to the user's preference, etc.

[0041] Furthermore, in the drill 10 equipped with the first cover 20A, the other axial end of the cutting portion 14 is covered by the tip portion 23 when viewed from the axial direction. The first cover 20A covers the part of the cutting portion 14 that is most likely to come into contact with the nerve N, thereby sufficiently reducing the risk of the cutting portion 14 coming into contact with the nerve N.

[0042] Furthermore, in the drill 10 equipped with the first cover 20A, the angle θ1 formed between the extension direction of the body 22 and the tangent direction at the other end of the tip portion 23 is approximately 90 degrees, which reduces the distance between the other end of the first cover 20A (the tip of the tip portion 23) and the cutting portion 14. Therefore, the drill 10 equipped with the first cover 20A can have a reduced overall axial length, is easy to handle inside the body, and makes it easy to bring the cutting portion 14 into contact with the bone B.

[0043] (protrusion) As shown in FIG. 3 , the first cover 20A has a protrusion 29. In a drill 10 equipped with the first cover 20A, the protrusion 29 extends from the inner circumferential surface 26 of the body 22 toward the rotary shaft 13 and faces the outer circumferential surface of the rotary shaft 13. When the tilt toward the rotary shaft 13 exceeds a predetermined amount, the first cover 20A can suppress the tilt of the rotary shaft 13 by bringing the protrusion 29 into contact with the outer circumferential surface of the rotary shaft 13. For example, when the first cover 20A is attached to a drill 10 having a conical tube 11, the first cover 20A can suppress the tilt of the cover 20 relative to the axial direction C0. This allows the first cover 20A to be maintained in a stable position in a drill 10 equipped with the first cover 20A. The protrusion 29 may be omitted from the cover 20 of the present disclosure.

[0044] (Regarding the cover according to the second embodiment) Fig. 6 is a schematic side view showing a second embodiment of the cover 20 of the present disclosure. In the following description, the cover 20 according to the second embodiment will also be referred to as the second cover 20B. The second cover 20B shown in Fig. 6 differs from the first cover 20A described above in that it has a straight portion 30 on the outer surface 28 of the tip portion 23. The other configuration of the second cover 20B is the same as that of the first cover 20A.

[0045] As shown in FIG. 6, the tip portion 23 of the second cover 20B extends in a curved shape from the other end of the body portion 22, followed by a straight portion 30. The straight portion 30 extends linearly in a direction intersecting the extension direction. In the second cover 20B, the angle θ2 formed between the extension direction of the body portion 22 and the extension direction of the straight portion 30 is an obtuse angle. In the second cover 20B attached to the tube 11, the tip portion 23 extends from the body portion 22 in a direction intersecting the axial direction C0 of the rotating shaft 13. In the second cover 20B, the tip portion 23 extends in a direction away from the other axial end of the blade portion 14.

[0046] In the drill 10 equipped with the second cover 20B, the distance between the other end of the tip portion 23 and the cutting edge 14 is greater than when the first cover 20A is used. Therefore, the total axial length of the drill 10 equipped with the second cover 20B is slightly greater than when the first cover 20A is used. Therefore, the second cover 20B can reduce the risk of the blade portion 14 coming into contact with the nerve N compared to when the first cover 20A is used.

[0047] (Regarding the cover according to the third embodiment) FIG. 7 is a schematic side view showing a third embodiment of the cover 20 of the present disclosure. In the following description, the cover 20 according to the third embodiment will also be referred to as the third cover 20C. The third cover 20C shown in FIG. 7 differs from the second cover 20B described above in the length of the linear portion 30. The other configuration of the third cover 20C is the same as that of the second cover 20B. In the third cover 20C, the angle θ3 formed between the extension direction of the body portion 22 and the extension direction of the linear portion 30 is an obtuse angle.

[0048] In the drill 10 equipped with the third cover 20C, the distance between the other end of the tip portion 23 and the cutting edge 14 is greater than when the second cover 20B is used. Therefore, the total axial length of the drill 10 equipped with the third cover 20C is even greater than when the first cover 20A and the second cover 20B are used.

[0049] In the drill 10 equipped with the third cover 20C, the tip portion 23 can cover substantially the entire cutting portion 14 when viewed in the axial direction. Furthermore, in the third cover 20C, the distance between the other end of the tip portion 23 and the cutting portion 14 is even greater than when the first cover 20A and the second cover 20B are used. Therefore, the third cover 20C can further reduce the risk of the cutting portion 14 coming into contact with the nerve N compared to when the first cover 20A and the second cover 20B are used.

[0050] (Regarding the cover according to the fourth embodiment) 8 is a schematic side view showing a fourth embodiment of the cover 20 of the present disclosure. In the following description, the cover 20 according to the fourth embodiment will also be referred to as a fourth cover 20D.

[0051] 8, the tip portion 23 of the fourth cover 20D has a straight portion 30 that extends linearly from the other end of the body portion 22 in a direction intersecting the extension direction. In the fourth cover 20D, the angle θ4 formed between the extension direction of the body portion 22 and the extension direction of the straight portion 30 is an acute angle, which differs from the covers 20 according to the other embodiments described above. In the fourth cover 20D, the tip portion 23 extends in a direction approaching the other axial end of the cutting portion 14.

[0052] 8, in fourth cover 20D, body 22 has a constant thickness in the extension direction. In this way, in cover 20 of the present disclosure, body 22 is not limited to a configuration in which the cross-sectional area increases from tip 23 toward base 21 (see FIG. 3, etc.), but may have a constant cross-sectional area in the extension direction.

[0053] In the drill 10 equipped with the fourth cover 20D, the distance between the other end of the tip portion 23 and the cutting edge 14 is smaller than when the first cover 20A is used. Therefore, the overall axial length of the drill 10 equipped with the fourth cover 20D is shorter than when the first cover 20A is used. Therefore, the drill 10 equipped with the fourth cover 20D is easier to handle inside the body than when the first cover 20A is used.

[0054] As described above, the cover 20 of the present disclosure can be selected from any of the covers 20A-20D shown in the first to fourth embodiments, taking into consideration various factors such as ensuring the field of view of the endoscope, visibility of the affected area, surgical operability, ease of handling the drill 10, the degree of need to avoid contact between the cutting portion 14 and the nerve N, the patient's physique, and the user's preferences. The distinctive features of each of the covers 20A-20D may be combined with other embodiments. This makes it possible to provide a cover 20 suitable for the drill 10 used in endoscopic surgery. Furthermore, providing a cover 20 suitable for the drill 10 can reduce the mental and physical burden on the surgeon performing endoscopic surgery. [Explanation of symbols]

[0055] 10 Drills (endoscopic surgical drills) 11 tubes 12 Rotate Tool 13 Rotation axis 14 Blade 20 Cover 20A 1st cover 20B Second cover 20C 3rd cover 20D 4th cover 21 Base 21a opening 22 Torso 23 Tip 24 Wall 24a 1st wall 24b 2nd wall section 25 Fitting groove 26 Inner surface 28 Exterior A1 (body) cross-sectional area A2 (body) cross-sectional area B Bone (affected area) C0 Axial direction (axis of rotation) N nerve P (tip) protrusion direction Q (opening) opening surface

Claims

1. A cover to be attached to a drill for endoscopic surgery, the drill comprising: a tube; a rotary tool having a rotary shaft extending in an axial direction and one axial side of which is inserted into the tube; and a cutting portion formed on an end of the rotary shaft on the other axial side, a body portion extending in an extension direction substantially parallel to the axial direction of the rotation shaft when attached to the drill; a base portion provided at one end of the body portion in the extension direction and configured to be attachable to and detachable from the tube by snap fitting; a tip portion extending from the other end of the body portion in the extension direction in a direction intersecting the extension direction.

2. the base portion has a fitting groove that can be fitted into an outer peripheral surface of the tube, The cover for an endoscopic surgical drill according to claim 1 , wherein the engagement groove extends in an axial direction.

3. 2. The cover for an endoscopic surgical drill according to claim 1, which is made of resin.

4. The cover for an endoscopic surgical drill according to claim 2 , wherein the fitting groove has an opening that opens in a direction perpendicular to the extension direction.

5. The cover for an endoscopic surgical drill according to claim 1 , wherein a cross-sectional area of ​​the body portion in a direction perpendicular to the extension direction increases from the distal end side toward the proximal end side.

6. the base portion has a pair of wall portions that form part of the fitting groove, 3. The cover for an endoscopic surgical drill according to claim 2, wherein the wall portion has a shape in which the wall thickness tapers toward the opening side of the fitting groove when viewed in a cross section perpendicular to the extension direction.

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