Surgical handpieces and surgical attachments

Abstract

To provide a surgical handpiece providing a surgical bur with high-speed and stable rotation and the inside of an instrument with waterproof, and surgical attachment constituting the surgical handpiece.SOLUTION: A surgical handpiece 1 includes a hollow outer pipe 10, a surgical bur 11 stored inside the outer pipe 10 and having a cutting part 14 capable of cutting a cutting object, at a tip end projecting from the outer pipe 10, a rolling bearing 21 provided between the outer pipe 10 and the surgical bur 11 and rotatably supporting the surgical bur 11 with respect to the outer pipe 10, and a bush 24, the annular waterproof member, provided between the outer pipe 10 and the surgical bur 11 in a state of including radial gaps G1 and G2 capable of retaining the water-tightness between the outer pipe 10 and the surgical bur 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a surgical handpiece used in surgical procedures and a surgical attachment that constitutes the surgical handpiece, for example, to a surgical handpiece used in surgery utilizing an endoscope (endoscopic surgery) and a surgical attachment for endoscopic surgery used therein. [Background technology]

[0002] There is known technology related to powered surgical handpieces (surgical cutting instruments) used in surgical procedures. A surgical handpiece is a hand-held instrument that uses a motor to rotate a cutting tool called a surgical burr to surgically cut off an affected area of ​​a patient. A typical surgical handpiece is used with an accessory part called a surgical attachment attached to the handpiece body. When performing a surgical procedure using a surgical handpiece, a surgeon holds the surgical handpiece by its grip in his or her hand, and when performing a surgical procedure, a surgical attachment is selected according to the procedure to be performed in the procedure and attached to the surgical handpiece to be used. Typically, surgical attachments include a sleeve (burr sleeve) that fits over the shaft of a surgical burr to support the burr as it rotates and prevent contact with the shaft during rotation.

[0003] Furthermore, there are known techniques relating to surgical handpieces and surgical attachments that enable an operator (surgeon) to access a surgical site that is far from the operator's (surgeon's) hands (see, for example, Patent Documents 1 to 3). Patent documents 1 to 3 disclose techniques relating to surgical handpieces using elongated surgical burrs of a predetermined length or more. Patent document 1 discloses a surgical handpiece attachment in which a sliding bearing is established between a surgical burr and a burr sleeve when the surgical burr rotates relative to the burr sleeve. Patent document 2 discloses a technique relating to a protection device for use with a surgical resection system. Patent document 3 discloses a surgical handpiece attachment in which a bearing sleeve supports a surgical burr as a journal bearing (sliding bearing) when a surgical resection method is performed using the rotating surgical burr. During surgical procedures in which these surgical handpieces are used, the operator (surgeon) holds the body of the surgical handpiece at a location away from the surgical site.

[0004] As an example of a surgery in which an operator (surgeon) holds and operates a surgical instrument at a position away from the surgical site, a surgery such as laparoscopic surgery or thoracoscopic surgery (endoscopic surgery) is known. In an endoscopic surgery, an opening (port) is provided on the surface of the patient's body, and handheld surgical instruments and an endoscope are inserted into the patient's body, and the surgery is performed while observing the inside of the body with the endoscope. In such a surgical operation, it is required to access the surgical site through the opening. Therefore, in such an endoscopic surgery, a long and thin instrument is used so that its distal end can reach the surgical site.

[0005] Furthermore, in endoscopic surgery, when surgical cutting or resection of body tissue is required, an endoscope equipped with a tube of a specified inner diameter is inserted from an opening, and while the inside of the endoscope tube is irrigated with physiological saline, a long and thin drill or the like is inserted into the tube to cut or resect the tissue. In other words, when performing endoscopic surgery using a surgical handpiece, a surgical attachment is selected that has a burr sleeve that is long and thin enough to be inserted inside the endoscope tube. In recent years, there has been a demand for minimally invasive surgical procedures that place less of a burden on patients. In order to achieve procedures that place less of a burden on patients, it is necessary to shorten the duration of surgery. To achieve this, there is a demand for surgical handpieces to have improved cutting capabilities through higher rotation speeds. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4538010 [Patent Document 2] Patent No. 5635660 [Patent Document 3] Patent No. 5714640 Summary of the Invention [Problem to be solved by the invention]

[0007] However, when using a surgical attachment with a long, thin burr sleeve in combination with a surgical burr, such as that selected for endoscopic surgery, it has been very difficult to rotate the surgical burr at high speed and in a stable manner.

[0008] In endoscopic surgery, in order to rotate the surgical burr quickly and stably, further improvements are required in the support structure of the surgical burr inserted into the surgical attachment. In addition, in endoscopic surgery, the inside of the tube of the endoscope into which the burr sleeve is inserted is irrigated with physiological saline while the surgery is performed. If water that exists around the surgical attachment during surgery gets into the inside of the burr sleeve, it may cause a malfunction or failure of the surgical attachment or the handpiece body. For example, by turning the surgical handpiece up after surgery, the water attached to the tip side may flow into the inside and reach the driving part such as the motor. It is desirable to prevent such a situation.

[0009] The present invention provides a surgical handpiece that provides high speed and stable rotation of a surgical burr and waterproofing of the inside of the instrument, and a surgical attachment that constitutes the surgical handpiece. [Means for solving the problem]

[0010] The surgical handpiece of the present invention comprises: A hollow outer pipe; a surgical burr housed inside the outer pipe and having a cutting portion at a tip protruding from the outer pipe, the cutting portion being capable of cutting an object to be resected; a rolling bearing provided between the outer pipe and the surgical burr, the rolling bearing supporting the surgical burr rotatably relative to the outer pipe; a ring-shaped waterproof member provided between the outer pipe and the surgical burr in a state where a radial gap capable of maintaining watertightness is provided between the outer pipe and the surgical burr; Equipped with.

[0011] The surgical attachment for endoscopic surgery of the present invention comprises: A hollow outer pipe; a rolling bearing provided inside the outer pipe; an annular waterproof member provided inside the outer pipe; A surgical attachment for endoscopic surgery comprising: When the surgical burr is stored inside the outer pipe, the rolling bearing rotatably supports the surgical burr relative to the outer pipe, and the waterproof member is provided between the outer pipe and the surgical burr with a radial gap capable of maintaining watertightness between the outer pipe and the surgical burr. Effect of the Invention

[0012] According to the present invention, it is possible to obtain stable rotation of the surgical burr and waterproofing of the inside of the instrument. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a side cross-sectional view of a portion of a surgical handpiece according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view of region A in FIG. [Diagram 3] FIG. 3 is an exploded view of the module, where (A) is an exploded side view and (B) is an exploded perspective view. [Figure 4] FIG. 4 is a diagram showing a first step in the assembly process of the surgical attachment according to the first embodiment. [Diagram 5] FIG. 5 is a diagram showing a second step in the assembly process of the surgical attachment according to the first embodiment. [Figure 6] FIG. 6 shows a surgical handpiece with a surgical burr attached thereto. [Figure 7] FIG. 7 is an enlarged view of region B in FIG. [Figure 8] FIG. 8 is a side cross-sectional view of a portion of a surgical handpiece according to a second embodiment of the present invention. [Figure 9] FIG. 9 is a side cross-sectional view of a portion of a surgical handpiece according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of a surgical handpiece to which the present invention is applied will be described in detail with reference to the drawings. Fig. 1 is a side cross-sectional view of a part of a surgical handpiece 1 according to a first embodiment of the present invention. Fig. 2 is an enlarged view of region A in Fig. 1.

[0015] The surgical handpiece 1 of this embodiment includes a hand peel body and a surgical attachment. FIG. 1 illustrates a cross section of a portion of the surgical attachment. Referring to FIG. 1, the surgical attachment includes an outer pipe 10, a rolling bearing 21, and a bush (waterproof member) 24. The surgical handpiece 1 is a long medical instrument. A surgical burr 11, which is a disposable member, is attached to the surgical handpiece 1. When a surgical operation is performed, the surgical burr 11 is rotated at high speed by a driving source (not shown) such as a motor. As the surgical burr 11 itself rotates, a cutting section 14 constituting the tip of the surgical burr resects the surgical site that is the target of resection.

[0016] The endoscope used in endoscopic surgery has a length that allows access to the surgical site through an opening (port) on the surface of the patient's body. Therefore, the surgical burr and surgical attachments selected for endoscopic surgery also have a corresponding length. By including such a surgical attachment, the surgical handpiece 1 is configured to have a predetermined length, allowing the operator to access a surgical site away from the operator's hand and cut or remove bone or other hard tissue.

[0017] The exterior pipe 10 is a hollow, elongated member extending in the axial direction (longitudinal direction) and has an elongated space formed therein. The surgical burr 11 is stored in the internal space of the exterior pipe 10 and has a cutting part 14 at its tip protruding from the exterior pipe 10, which is capable of cutting an object to be resected.

[0018] In this embodiment, the surgical burr 11 is composed of the cutting portion 14 at the tip and the shank portion 12. The cutting portion 14 is joined to the tip of the shank portion 12 by a method such as screwing or welding, but the joining method is not particularly limited, and the cutting portion 14 and the shank portion 12 may be integrally molded from the beginning. The cutting portion 14 is a cutting member that cuts and removes bone or other hard tissue, and may be made of a hard material such as metal, but the material is not particularly limited. The cutting portion 14 acts as a drill having various blades, grooves, etc., but the shape is not particularly limited, and an appropriate one is selected depending on, for example, the characteristics of the object to be cut (type of surgical operation site). The shank portion 12 is formed, for example, from a thin metal rod, but the material and structure are not particularly limited as long as it is a long member, and it can be made of a member such as a wire.

[0019] Fig. 2 is a cross-sectional view illustrating the configuration of the surgical attachment of this embodiment. As shown in Fig. 2, the surgical attachment includes a rolling bearing 21. The rolling bearing 21 is a member that rotatably supports the surgical burr 11 relative to the outer pipe 10. The rolling bearing 21 has rolling elements 22. According to the configuration of this embodiment, an inner ring of the rolling bearing 21 contacts the surface of the shank portion 12 of the surgical burr 11, an outer ring contacts the inner surface of the outer pipe 10, and the rolling elements 22 roll between the inner ring and the outer ring, allowing the surgical burr 11 to rotate at high speed (e.g., about 80,000 rpm) inside the outer pipe 10.

[0020] In conventional instruments, the surgical burr 11 is supported by a sliding bearing, but there are concerns about the sliding bearings seizing up when the surgical handpiece is required to rotate at high speed. Although support by a sliding bearing makes it easy to ensure watertightness, it is difficult to maintain high-speed and stable rotation. Compared to such conventional instruments, the surgical handpiece 1 of this embodiment uses a rolling bearing 21 having rolling elements, which enables high-speed and stable rotation of the surgical burr 11.

[0021] Further, referring to FIG. 2, the surgical attachment of this embodiment is provided with an annular bush 24 as a waterproof member. The bush 24 is provided on the outer pipe 10 with a minute radial gap therebetween to the extent that watertightness can be maintained. Furthermore, when the surgical burr 11 is inserted into the burr sleeve of the surgical attachment, the bush 24 maintains a non-contact state with the surgical burr 11 with a minute radial gap therebetween to the extent that watertightness can be maintained. The bush 24 is a cylindrical member made of a resin material or the like, but the material is not particularly limited. Furthermore, the bush 24 is supported by a predetermined member, the rolling bearing 21 in this embodiment, so that the movement of the rolling bearing 21 in the axial direction (which is also the axial direction of the outer pipe 10 and the surgical burr 11) is restricted, and the bush 24 is stably fixed at a predetermined position. The above-mentioned gap will be described in detail later.

[0022] In this embodiment, the bush 24 is disposed at the tip of the exterior pipe 10. Here, the side of the exterior pipe 10 from which the cutting portion 14 of the surgical burr 11 protrudes is defined as the tip. The bush 24 is provided in a state of being sandwiched between a pair (two) rolling bearings 21 (21a, 21b) arranged in the axial direction of the exterior pipe 10 and the surgical burr 11. The bush 24 is disposed with a minute radial gap provided between the exterior pipe 10 and the surgical burr 11 to an extent that watertightness can be maintained even when the surgical burr 11 is not in a rotational motion. Furthermore, the bush 24 in this embodiment is sandwiched in a state of direct contact with the rolling bearings 21 (21a, 21b) on both sides in the axial direction of the rolling bearing 21, so that the axial movement is restricted and the bush 24 is stably fixed at a predetermined position.

[0023] In other words, the surgical attachment of this embodiment has two rolling bearings on the tip side. The front of the two rolling bearings is the front bearing 21a, and the rear of the two rolling bearings is the rear bearing 21b. The bush 24 is supported in a sandwiched state between the front bearing 21a and the rear bearing 21b.

[0024] The inner ring of the front bearing 21a supports the shank portion 12 of the surgical burr 11, and similarly, the inner ring of the rear bearing 21b supports the shank portion 12 of the surgical burr 11. The two rolling bearings 21 suppress the whirling of the surgical burr 11. Therefore, when the surgical burr 11 is rotated, the shank portion 12 does not come into contact with the inside of the bushing 24, and a non-contact state can always be maintained.

[0025] The pair of rolling bearings 21 (21a, 21b) and the bush 24 are assembled into a modularized member that is integrated in advance as a structural assembly. Figure 3 shows exploded views of this module 26, where (A) is an exploded side view and (B) is an exploded perspective view. The module 26 includes a cylindrical cover 28, a pair of rolling bearings 21 (21a, 21b), the bush 24, and a spacer 31. The cylindrical cover 28 is a hollow cylindrical member similar to the outer pipe 10, and during assembly, the module 26 is completed by inserting the rolling bearing 21a, bush 24, rolling bearing 21b, and spacer 31 in this order into the internal space of the cylindrical cover 28.

[0026] Module 26 is assembled and integrated in advance before the assembly of surgical handpiece 1 shown in Figures 4 and 5. In completed module 26, cylindrical cover 28, pair of rolling bearings 21 (21a, 21b), bush 24, and spacer 31 are integrally and coaxially supported on the inner periphery of cylindrical cover 28. Since pair of rolling bearings 21 (21a, 21b), bush 24, and spacer 31 are all annular members, a space is formed in the radial center through which shank portion 12 of surgical burr 11 can pass.

[0027] When the module 26 is attached to the tip of the exterior pipe 10, it constitutes the tip of the exterior pipe 10, which is a part of the exterior pipe 10. In a long member, it is not easy to arrange the bush 24 between the pair of rolling bearings 21 (21a, 21b), but by previously arranging the pair of rolling bearings 21 (21a, 21b) and the bush 24 side by side in the module 26, the arrangement of the bush 24 becomes easier.

[0028] 4 and 5 show the first and second steps, respectively, of the process of assembling the surgical attachment. In the first step shown in Fig. 4, a preassembled module 26 is placed opposite the distal end of the outer pipe 10. A base end 41 on the opposite side to the distal end of the outer pipe 10 is connected to a motor or the like that rotates the surgical burr 11.

[0029] 5, the module 26 is attached to the tip of the exterior pipe 10. When the module 26 is attached to the tip of the exterior pipe 10, it constitutes a part (the tip) of the exterior pipe 10. The outer shape of the cylindrical cover 28 of the module 26 is the same as that of the exterior pipe 10, and the exterior pipe 10, including the module 26, becomes a long pipe with a smooth outer surface.

[0030] Furthermore, before the module 26 is attached, the various members are arranged in advance in the internal space of the exterior pipe 10 from the tip side to the drive unit 40 in the following order: spacer 32, coil spring 16, spacer 33, spacer 34, rolling bearing 21c, spacer 35, rolling bearing 21d, spacer 36, rolling bearing 21e, spacer 37, rolling bearing 21f, and spacer 38. When the module 26 is attached to the tip part of the exterior pipe 10, the spacer 31 arranged at the rear end of the module 26 presses the spacer 32 protruding toward the tip side by the elastic action of the coil spring 16, which is an elastic member, compressing the coil spring 16, and pressing the remaining spacers 33, spacer 34, rolling bearing 21c, spacer 35, rolling bearing 21d, spacer 36, rolling bearing 21e, spacer 37, rolling bearing 21f, and spacer 38 toward the drive unit 40 side. Since the drive unit 40 receives these members against this pressing force, each member is stably fixed in a predetermined position.

[0031] 4 and 5 show the state of the surgical attachment 5 for endoscopic surgery before the surgical burr 11 is stored. The surgical attachment 5 for endoscopic surgery includes an outer pipe 10, a rolling bearing 21 provided inside the outer pipe 10, and an annular bushing 24 provided inside the outer pipe 10. When the surgical burr 11 is stored inside the outer pipe 10, the rolling bearing 21 supports the surgical burr 11 rotatably relative to the outer pipe 10, and the bushing 24 is provided between the outer pipe 10 and the surgical burr 11 with a radial gap between the outer pipe 10 and the surgical burr 11 that can maintain watertightness. Thus, when the surgical burr 11 is stored in the surgical attachment 5 for endoscopic surgery, a surgical handpiece 1 that allows stable rotation of the surgical burr 11 and excellent waterproofing of the inside of the instrument can be provided.

[0032] In other words, the inner ring of the front bearing 21a of the rolling bearing 21 supports the shank portion 12 of the surgical burr 11, and similarly the inner ring of the rear bearing 21b supports the shank portion 12 of the surgical burr 11, so that the action of the two rolling bearings 21 suppresses the whirling of the surgical burr 11. When the surgical burr 11 is rotated in this state, the shank portion 12 does not come into contact with the inside of the bushing 24, and the surgical burr can be rotated while always maintaining a non-contact state while ensuring watertightness. Furthermore, watertightness can continue to be ensured even when the rotation is stopped.

[0033] Fig. 6 is a diagram showing a state in which a surgical burr is attached to a surgical instrument. In Fig. 6, the handpiece body is omitted in order to facilitate understanding of the present invention. As shown in Fig. 6, a surgical burr 11 having a cutting part 14 at its tip is inserted into the internal space of the outer pipe 10 (surgical attachment 5 for endoscopic surgery) from the tip side of the outer pipe 10, and the rear end of the surgical burr 11 is held by a chuck (not shown) at the rear of the base end 41, thereby making it possible to perform surgery.

[0034] Furthermore, as shown in Figure 6, the surgical attachment of this embodiment has a number of ball bearings arranged in addition to the front bearing 21a and rear bearing 21b in Figure 2. By selectively making the front bearing 21a and rear bearing 21b of the plurality of ball bearings highly corrosion-resistant, the durability of the surgical attachment can be further improved.

[0035] 7 is an enlarged view of region B in FIG. 2, and is an enlarged view of the bush 24 and the rolling bearing 21. The bush 24 is sandwiched between the rolling bearings 21 (21a, 21b) on both sides in the axial direction, and the movement in the axial direction is restricted by the action of the rolling bearings 21 (21a, 21b), and the bush 24 is stably fixed at a predetermined position. Meanwhile, in the radial direction perpendicular to the axial direction, a radial gap G1 is provided between the bush 24 and the surgical burr 11, and a radial gap G2 is provided between the bush 24 and the cylindrical cover 28 (the tip of the outer pipe 10). This radial gap is a very small gap, and even if water such as saline infiltrates from the tip, it can be prevented from further infiltrating into the drive unit 40, thereby suppressing defects such as corrosion of metal parts, failures, and the like.

[0036] For example, if an operator lifts the surgical handpiece 1 so that the tip of the surgical handpiece 1 faces upward while the surgical burr 11 is stopped from rotating, it is expected that water will easily enter the inside of the module 26 from the tip. However, the bush 24 stops further water from entering, thereby suppressing malfunctions and breakdowns of the surgical handpiece 1 caused by water. Particularly in this embodiment, the bush 24 is provided at the tip of the outer pipe 10, so that water can be prevented from entering at an early stage.

[0037] Furthermore, due to the presence of the radial gap G1, the bushing 24 is not in direct contact with the surgical burr 11, and therefore seizure between the rotating surgical burr 11 and the bushing 24 can also be prevented. The radial gap G1 between the surgical burr 11 and the bushing 24 is larger than the radial gap G2 between the bushing 24 and the cylindrical cover 28 (a part of the tip of the outer pipe 10) (G1>G2), effectively suppressing contact between the surgical burr 11 rotating at high speed and the bushing 24. Note that the radial gap G1 is essential to prevent contact between the bushing 24 and the surgical burr 11, but the radial gap G2 is a gap provided for the convenience of assembly manufacturing, and the radial gap G2 is not essential (G2=0 may be acceptable).

[0038] Fig. 8 is a side cross-sectional view of a part of a surgical handpiece 1 according to a second embodiment of the present invention. In this embodiment, the bush 24 is provided not inside the module 26 but between the spacer 34 and the rolling bearing 21c arranged inside the exterior pipe 10. Even in this configuration, the bush 24 can be stably fixed at a predetermined position. Also in this configuration, radial gaps G1 and G2 are provided as shown in Fig. 7.

[0039] 9 is a side cross-sectional view of a portion of a surgical handpiece 1 according to a third embodiment of the present invention. In this embodiment, the shape of the bushing 24 is changed from that of the first embodiment. In the first embodiment, the bushing 24 contacts both the rolling bearing 21a and the rolling bearing 21b over an equal area, but in this embodiment, the bushing 24 contacts the rolling bearing 21a over a larger area than the rolling bearing 21b.

[0040] According to the surgical cutting instrument of the present invention, the rolling bearings enable high-speed and stable rotation of the surgical burr 11 to be maintained, while the waterproof member improves waterproofing.

[0041] The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, etc. In addition, the material, shape, size, numerical value, form, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary as long as they can achieve the present invention, and are not limited.

[0042] As described above, the present specification discloses the following: (1) a hollow outer pipe; a surgical burr housed inside the outer pipe and having a cutting portion at a tip protruding from the outer pipe, the cutting portion being capable of cutting an object to be resected; a rolling bearing provided between the outer pipe and the surgical burr, the rolling bearing supporting the surgical burr rotatably relative to the outer pipe; a ring-shaped waterproof member provided between the outer pipe and the surgical burr in a state where a radial gap capable of maintaining watertightness is provided between the outer pipe and the surgical burr; A surgical handpiece comprising: This allows for stable rotation of the elongated member and ensures waterproofing of the inside of the device.

[0043] (2) A surgical handpiece according to (1), The waterproof member restricts axial movement of the rolling bearing between the outer pipe and the surgical burr. This allows the waterproofing member to be stably fixed in place.

[0044] (3) A surgical handpiece according to (2), the waterproof member is provided between a pair of rolling bearings arranged spaced apart from each other in the axial direction at a tip end of the outer pipe on a side from which the cutting portion of the surgical burr protrudes. This allows the waterproofing member to be stably fixed in place and prevents water from entering at an early stage.

[0045] (4) A surgical handpiece according to (3), The waterproof member further includes a cylindrical cover that coaxially accommodates at least the pair of rolling bearings and the waterproof member. the cylindrical cover, the pair of rolling bearings, and the waterproof member constitute a module that is coaxially and integrally supported on an inner periphery of the cylindrical cover, A surgical handpiece, wherein the module is attached to the distal end of the outer pipe. This makes it easier to arrange the waterproofing members, and also makes it easier to replace and maintain the modules.

[0046] (5) A surgical handpiece according to any one of (1) to (4), The surgical handpiece, wherein a radial gap between the surgical burr and the waterproof member is larger than a radial gap between the waterproof member and the outer pipe. This effectively prevents the waterproof member from coming into contact with the surgical burr rotating at high speed.

[0047] (6) a hollow outer pipe; a rolling bearing provided inside the outer pipe; an annular waterproof member provided inside the outer pipe; A surgical attachment for endoscopic surgery comprising: When the surgical burr is housed inside the outer pipe, the rolling bearing rotatably supports the surgical burr with respect to the outer pipe, and the waterproof member is provided between the outer pipe and the surgical burr with a radial gap capable of maintaining watertightness between the outer pipe and the surgical burr. Surgical attachments for endoscopic surgery. This makes it possible to provide a surgical attachment for endoscopic surgery that allows for stable rotation of the surgical burr when the surgical burr is stored and has excellent waterproofing properties for the inside of the instrument.

[0048] (7) A surgical attachment for endoscopic surgery according to (6), A surgical attachment for endoscopic surgery, wherein the waterproof member restricts axial movement of the rolling bearing. This allows the waterproofing member to be stably fixed in place.

[0049] (8) A surgical attachment for endoscopic surgery according to (7), A surgical attachment for endoscopic surgery, wherein the waterproof member is provided at the tip of the outer pipe, between a pair of rolling bearings arranged spaced apart from each other in the axial direction. This allows the waterproofing member to be stably fixed in place and prevents water from entering at an early stage.

[0050] (9) A surgical attachment for endoscopic surgery according to (8), The waterproof member further includes a cylindrical cover that coaxially accommodates at least the pair of rolling bearings and the waterproof member. the cylindrical cover, the pair of rolling bearings, and the waterproof member constitute a module that is coaxially and integrally supported on an inner periphery of the cylindrical cover, A surgical attachment for endoscopic surgery, wherein the module is attached to the tip portion of the outer pipe. This makes it easier to arrange the waterproofing members, and also makes it easier to replace and maintain the modules. [Explanation of symbols]

[0051] 1 Surgical Handpiece 5 Surgical attachments for endoscopic surgery 10 Outer pipe 11 Surgical Bur 12 Shank 14 Cutting part 16 Coil spring 21, 21a, 21b, 21c, 21d, 21e, 21f Rolling bearings 22 Rolling elements 24 Bush (waterproof material) 26 Modules 28 Cylindrical cover 31, 32, 33, 34, 35, 36, 37 Spacer G1 Radial clearance G2 Radial clearance

Claims

1. A hollow outer pipe; a surgical burr housed inside the outer pipe and having a cutting portion at a tip protruding from the outer pipe, the cutting portion being capable of cutting an object to be resected; a rolling bearing provided between the outer pipe and the surgical burr, the rolling bearing supporting the surgical burr rotatably relative to the outer pipe; a ring-shaped waterproof member provided between the outer pipe and the surgical burr in a state where a radial gap capable of maintaining watertightness is provided between the outer pipe and the surgical burr; Equipped with The radial gap is (1) between the waterproof member and the surgical burr; (2) Between the waterproof member and the outer pipe, Provided only in (1) or in both (1) and (2), Surgical handpiece.

2. 2. The surgical handpiece of claim 1, The waterproof member restricts axial movement of the rolling bearing between the outer pipe and the surgical burr.

3. 3. The surgical handpiece of claim 2, the waterproof member is provided between a pair of rolling bearings arranged spaced apart from each other in the axial direction at a tip end of the outer pipe on a side from which the cutting portion of the surgical burr protrudes.

4. 4. The surgical handpiece of claim 3, The waterproof member further includes a cylindrical cover that coaxially accommodates at least the pair of rolling bearings and the waterproof member. the cylindrical cover, the pair of rolling bearings, and the waterproof member constitute a module that is coaxially and integrally supported on an inner periphery of the cylindrical cover, A surgical handpiece, wherein the module is attached to the distal end of the outer pipe.

5. 5. A surgical handpiece according to claim 1, The surgical handpiece, wherein a radial gap between the surgical burr and the waterproof member is larger than a radial gap between the waterproof member and the outer pipe.

6. A hollow outer pipe; a rolling bearing provided inside the outer pipe; an annular waterproof member provided inside the outer pipe; A surgical attachment for endoscopic surgery comprising: in a state in which the surgical burr is housed inside the outer pipe, the rolling bearing rotatably supports the surgical burr with respect to the outer pipe, and the waterproof member is provided between the outer pipe and the surgical burr with a radial gap capable of maintaining watertightness between the outer pipe and the surgical burr, The radial gap is (1) between the waterproof member and the surgical burr; (2) Between the waterproof member and the outer pipe, Provided only in (1) or in both (1) and (2), Surgical attachments for endoscopic surgery.

7. 7. A surgical attachment for endoscopic surgery according to claim 6, A surgical attachment for endoscopic surgery, wherein the waterproof member restricts axial movement of the rolling bearing.

8. 8. A surgical attachment for endoscopic surgery according to claim 7, A surgical attachment for endoscopic surgery, wherein the waterproof member is provided at the tip of the outer pipe, between a pair of rolling bearings arranged spaced apart from each other in the axial direction.

9. 9. A surgical attachment for endoscopic surgery according to claim 8, The waterproof member further includes a cylindrical cover that coaxially accommodates at least the pair of rolling bearings and the waterproof member. the cylindrical cover, the pair of rolling bearings, and the waterproof member constitute a module that is coaxially and integrally supported on an inner periphery of the cylindrical cover, A surgical attachment for endoscopic surgery, wherein the module is attached to the tip portion of the outer pipe.

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