Microshield bag

Abstract

Provided is a micro-protection bag that simplifies the assembly work of a surgical microscope. The micro-protection bag includes: a cap unit that is detachably attached to a housing of an objective lens of a surgical microscope; a protection lens that protects the objective lens; and a protection bag body that covers the surgical microscope. The cap unit includes: a cylindrical body having an inner diameter that is larger than the housing; a plurality of protrusions that protrude from an inner peripheral surface of the cylindrical body to an inner diameter direction at positions that are spaced apart in a circumferential direction of the cylindrical body; and a pressing member that presses the protrusion supported so as to be retractable in the cylindrical body in a direction in which the protrusion protrudes from the inner peripheral surface of the cylindrical body. The protection lens is supported at a front end of the cylindrical body in a state in which the protection lens is inclined with respect to an optical axis of the objective lens.

Description

TECHNICAL FIELD

[0001] The present application relates to a micro-protection bag for covering a surgical microscope. BACKGROUND

[0002] In brain nerve surgery, ear-nose-throat surgery, plastic surgery, or ophthalmology, a surgical microscope is used to enlarge the surgical field while performing surgery. Since it is difficult to sterilize the surgical microscope itself, a micro-protection bag is used to cover the surgical microscope every time surgery is performed to ensure a clean field of view, which is a common practice (see, for example, Patent Documents 1 to 4).

[0003] A general micro-protection bag is configured to be attached to and detached from a cover unit of an objective lens of a surgical microscope, and a bag-shaped protection bag body that is assembled to the cover unit and covers the surgical microscope. In Patent Document 5, various modifications of the cover unit of the objective lens that can be attached to objective lenses of different diameters, and a configuration in which the angle of the protection lens is changed to prevent reflection or glare of the incident light of the surgical microscope from the optical axis are disclosed.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT DOCUMENTS

[0006] Patent Document 1: Japanese Patent Application Publication No. 2012-183449

[0007] Patent Document 2: Japanese Patent Application Publication No. 2014-161504

[0008] Patent Document 3: Japanese Patent Application Publication No. 2010-512851

[0009] Patent Document 4: Japanese Patent Application Publication No. 2017-107210

[0010] Patent Document 5: International Publication No. 2022 / 003806 SUMMARY

[0011] [PROBLEMS TO BE SOLVED BY THE INVENTION]

[0012] However, the micro-protection bag of Patent Document 5 has the problem that the operation of assembling the cover unit to the objective lens is complicated (for example, the assembly sequence is significantly different from that of a general micro-protection bag, and a large amount of force is required for the assembly operation).

[0013] The present application was made to solve such a problem of the related art, and an object thereof is to provide a micro-protection bag that simplifies the assembly operation to a surgical microscope.

[0014] [MEANS FOR SOLVING THE PROBLEMS]

[0015] To solve the aforementioned problem, the present application has the following features. A micro protective bag includes: a cover unit that is detachably attached to a housing of an objective lens of a surgical microscope; a protective lens that protects the objective lens; and a protective bag body that covers the surgical microscope; wherein the cover unit includes: a cylindrical body having an inner diameter that is larger than the housing; a plurality of protrusions that protrude from an inner circumferential surface of the cylindrical body to an inner diameter side at positions that are spaced apart in a circumferential direction of the cylindrical body; and a pressing member that presses the protrusions that are supported so as to be retractable in the cylindrical body in a direction in which the protrusions protrude from the inner circumferential surface of the cylindrical body; and the protective lens is supported at a front end of the cylindrical body in a state in which the protective lens is inclined with respect to an optical axis of the objective lens.

[0016] [Effects of the Invention]

[0017] According to the present application, a micro protective bag that simplifies assembly work for a surgical microscope can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic configuration diagram of a main part of a surgical microscope and a micro protective bag.

[0019] Figure 2A FIG. 2 is an oblique view of a micro protective bag according to a first embodiment, as viewed obliquely from above.

[0020] Figure 2B FIG. 3 is an oblique view of the micro protective bag according to the first embodiment, as viewed obliquely from below.

[0021] Figure 3A FIG. 4 is a longitudinal sectional view of the micro protective bag according to the first embodiment.

[0022] Figure 3B FIG. 5 is a plan view of the micro protective bag according to the first embodiment.

[0023] Figure 4A FIG. 6 is a longitudinal sectional view showing a state before assembly of a cover unit of the first embodiment to a housing.

[0024] Figure 4B FIG. 7 is a longitudinal sectional view showing a state during assembly of the cover unit of the first embodiment to the housing.

[0025] Figure 4C FIG. 8 is a longitudinal sectional view showing a state after assembly of the cover unit of the first embodiment to the housing.

[0026] Figure 5A FIG. 9 is a plan view showing the state before assembly of the cover unit of the first embodiment to the housing.

[0027] Figure 5B FIG. 10 is a plan view showing the state after assembly of the cover unit of the first embodiment to the housing.

[0028] Figure 6 Exploded perspective view of the mirror cover unit of the second embodiment as viewed obliquely from above.

[0029] Figure 7 Exploded perspective view of the mirror cover unit of the second embodiment as viewed obliquely from below.

[0030] Figure 8A Assembled perspective view of the mirror cover unit of the second embodiment as viewed obliquely from above.

[0031] Figure 8B Assembled perspective view of the mirror cover unit of the second embodiment as viewed obliquely from below.

[0032] Figure 9A Longitudinal sectional view showing the state before the mirror cover unit of the second embodiment is assembled to the housing.

[0033] Figure 9B Longitudinal sectional view showing the state after the mirror cover unit of the second embodiment is assembled to the housing.

[0034] Figure 10A Plan view showing the state before the mirror cover unit of the second embodiment is assembled to the housing.

[0035] Figure 10B Plan view showing the state after the mirror cover unit of the second embodiment is assembled to the housing.

[0036] In the drawings:

[0037] 1: surgical microscope

[0038] 2, 3, 4, 5: arm

[0039] 6: objective lens

[0040] 7: ocular lens

[0041] 8: housing

[0042] 10: micro protective bag

[0043] 20: protective bag body

[0044] 21, 37a, 46a, 47a, 47b, 47c: through hole

[0045] 30, 40: mirror cover unit

[0046] 31, 41: cover body

[0047] 32, 33, 34, 42, 43, 44: protrusion

[0048] 35: coil spring

[0049] 36, 52: protective mirror

[0050] 37, 47: barrel

[0051] 38, 48: housing

[0052] 45: elastic body

[0053] 46: substrate

[0054] 47d: abutting ring

[0055] 47e: notch

[0056] 47f: groove

[0057] 48a: pin

[0058] 50: protective mirror unit

[0059] 51: ring portion

[0060] 53: cover portion

[0061] 54: ridge DETAILED DESCRIPTION

[0062] Hereinafter, a micro-protection bag 10 according to an embodiment will be described with reference to the drawings. Note that the embodiment of the present application described below is an example illustrating a case where the present application is embodied, and the scope of the present application is not limited to the range described in the embodiment. Therefore, the present application can be embodied by adding various modifications to the embodiment.

[0063] Figure 1 is a schematic configuration diagram of a main part of a surgical microscope 1 and the micro-protection bag 10. As shown in the drawing, the surgical microscope 1 mainly includes a plurality of arms 2, 3, 4, 5, which are rotatably coupled to each other, an objective lens 6, and an ocular lens 7, which are assembled to a front end of the arm 5. Next, by rotating the coupling portions of the arms 2 to 5 with respect to each other, the objective lens 6 can be disposed at a position facing a surgical field. Next, a physician (operator) can observe the enlarged surgical field through the ocular lens 7. Figure 1

[0064] Further, the objective lens 6 is a convex lens. Next, the objective lens 6 is assembled to the inside of a cylindrical housing 8. In other words, the optical axis L0 of the objective lens 6 indicated by a dotted line represents a direction in which the objective lens 6 is aligned with the axis direction of the housing 8. Figure 1

[0065] ​​Furthermore, the surgical microscope 1 is equipped with an illumination device (e.g., an LED (light-emitting diode) or a xenon lamp). Light from the illumination device is directed through an optical system (lenses, mirrors, etc.) housed within arms 2-5, passing through the objective lens 6 and illuminating the surgical field of view. This light is then reflected back into the objective lens 6, allowing the surgeon to observe the surgical field. The direction of the light from the illumination device is, for example, tilted 3-6 degrees relative to the optical axis L0. o The degree of.

[0066] All instruments that come into contact with the surgical site or may come into contact with the surgical site during surgery need to be sterilized. However, sterilizing the surgical microscope 1 itself is difficult, so the surgical microscope 1 is covered with a disposable micro-protective bag 10 for each surgery. The micro-protective bag 10 is packaged in a sterilized state, and the packaging is opened in the operating room to cover the surgical microscope 1.

[0067] [First Implementation Example]

[0068] like Figure 1 As shown, the micro protective bag 10 in the first embodiment mainly comprises a protective bag body 20 and a lens cover unit 30.

[0069] The protective bag body 20 is a sheet-like component formed of a transparent or translucent material (e.g., polyethylene). The protective bag body 20 can take various known shapes to cover the main part of the surgical microscope 1. For example, the protective bag body 20 can be a simple sheet or a bag. As another example, as shown in Japanese Patent No. 6749532, the protective bag body 20 may have a first protective bag and a second protective bag in the form of a long strip. Furthermore, as another example, as shown in Japanese Patent No. 7122054, the protective bag body 20 may have a bag-like portion and a strip-like portion.

[0070] The lens cover unit 30 is assembled to the protective bag body 20. Specifically, the micro protective bag 10 is integrated by fusing the lens cover unit 30 to the periphery of the through hole 21 that penetrates the protective bag body 20 in the thickness direction. Furthermore, the lens cover unit 30 is assembled to the housing 8. Moreover, the lens cover unit 30 prevents reflection or glare of incident light from the surgical microscope 1.

[0071] [Composition of the lens cover unit 30]

[0072] Figure 2A The first embodiment of the micro-protective bag 10 is viewed from an oblique angle. Figure 2B The first embodiment of the micro-protective bag 10 is viewed from a downward angle. Figure 3A This is a longitudinal cross-sectional view of the micro-protective bag 10 in the first embodiment. Figure 3B This is a plan view of the micro-protective bag 10 in the first embodiment.

[0073] like Figures 2A-3B As shown, the mirror cover unit 30 mainly includes a cover body 31, multiple (three in this embodiment) protrusions 32, 33, and 34, a coil spring 35 (an example of a pressure-applying component), and a protective mirror 36.

[0074] The cover body 31 supports protrusions 32-34, a coil spring 35, and a protective mirror 36, and is assembled to the housing 8. The cover body 31 is formed, for example, of resin (e.g., polypropylene). The cover body 31 is, for example, integrally formed with a cylindrical body 37 and a receiving portion 38.

[0075] The cylindrical body 37 has a cylindrical shape with openings at both ends along the axial direction. Furthermore, the inner diameter of the cylindrical body 37 is set to be larger than the outer dimensions of various housings 8 intended to house the mirror cover unit 30. Moreover, the outer peripheral surface of the cylindrical body 37 is fused to the periphery of the through hole 21 of the protective bag body 20. For example... Figure 3A As shown, in the first embodiment, the length of the cylinder 37 in the circumferential direction is different in the axial direction. More specifically, the length of the cylinder 37 at one end in the axial direction ( Figure 3A (the upper part) for Figure 3A The axis of the cylinder 37, indicated by a dashed line, is orthogonal. On the other hand, the end of the cylinder 37 on the other side of its axial direction ( Figure 3A The lower end is inclined relative to the axis of the cylinder 37.

[0076] The receiving portion 38 is a portion that protrudes from the outer peripheral surface of the cylinder 37 along a portion of its circumferential direction. In the first embodiment, the receiving portion 38 is formed in the portion of the cylinder 37 with the longest length in the axial direction along its circumferential direction. The receiving portion 38 has an internal space for accommodating the coil spring 35. Next, a through hole 37a is formed on the cylinder 37, penetrating the cylinder 37 in the thickness direction. Then, the internal space of the cylinder 37 and the internal space of the receiving portion 38 are connected through the through hole 37a.

[0077] The protrusions 32 to 34 are formed, for example, of resin (polyurethane). Furthermore, the protrusions 32 to 34 are spaced apart in the circumferential direction of the cylinder 37. Also, the protrusions 32 to 34 protrude from the inner circumferential surface of the cylinder 37 to the radially inward side. Moreover, of the protrusions 32 to 34, one protrusion 32 is a "movable protrusion 32," and the remaining two protrusions 33 and 34 are "fixed protrusions 33 and 34." Also, the number of protrusions 32 to 34 is not limited to three; two or more are acceptable. Furthermore, the number of movable protrusions 32 is not limited to one; one or more are acceptable. In other words, all of the protrusions 32 to 34 may be movable protrusions 32 to 34.

[0078] The movable protrusion 32 is disposed at the position of the through-hole 37a. Also, the movable protrusion 32 is supported so as to be retractable (protruding and retracting) in the barrel 37. Also, "the movable protrusion 32 is retracted in the barrel 37" does not require that the front end of the movable protrusion 32 is completely retracted in the barrel 37, but the protruding amount of the movable protrusion 32 from the inner peripheral surface of the barrel 37 can be reduced from the state of protruding the most. Further, the movable protrusion 32 is pressed in the direction of protruding from the inner peripheral surface of the barrel 37 by the coil spring 35. Then, the protruding amount of the protrusions 32 to 34 from the inner peripheral surface of the barrel 37 can be the same when the movable protrusion 32 protrudes the most.

[0079] The fixed protrusions 33 and 34 are fixed so as to protrude to the radial direction inside from the inner peripheral surface of the barrel 37. Also, in the circumferential direction of the barrel 37, the interval LI of the movable protrusion 32 and the fixed protrusion 33 and the interval LI of the movable protrusion 32 and the fixed protrusion 34 are the same. On the other hand, in the circumferential direction of the barrel 37, the interval L2 of the fixed protrusions 33 and 34 is narrower than the interval LI of the movable protrusion 32 and the fixed protrusions 33 and 34. However, the intervals of the three protrusions 32 to 34 can be the same (the case of the first embodiment is 120 o ).

[0080] The protection mirror 36 is a flat-shaped lens formed of a light-transmissive material (for example, glass, polycarbonate, or the like). However, the shape of the protection mirror 36 is not limited to the flat shape, and a convexly protruding curved lens can also be used. The protection mirror 36 is fixed to the end portion on the other side in the axial direction of the barrel 37 (the end portion on the side inclined to the axial direction of the barrel 37). Then, the protection mirror 36 is supported at the front end of the barrel 37 in a state inclined to the optical axis LO of the objective lens 6. In other words, of the both end portions in the axial direction of the barrel 37, the end portion on the one side is open, and the end portion on the other side is closed by the protection mirror 36.

[0081] The protection mirror 36 protects the objective lens 6 of the surgical microscope 1. In detail, when the cover glass unit 30 is attached to the housing 8, the protection mirror 36 faces the objective lens 6 on the optical axis LO of the objective lens 6. Then, external light is incident to the objective lens 6 through the protection mirror 36. Also, the protection mirror 36 prevents reflection or glare of the incident light of the surgical microscope 1 by being inclined to the optical axis LO.

[0082] [Assembly method of the cover glass unit 30]

[0083] Fig. 4 is a longitudinal sectional view showing the state of the cover glass unit 30 of the first embodiment before being assembled in the housing 8 (A), during assembly (B), and after assembly (C). Fig. 5 is a plan view showing the state of the cover glass unit 30 of the first embodiment before being assembled in the housing 8 (A) and after assembly (B).

[0084] First, as shown in Fig. 4A, the cover glass unit 30 is placed on the housing 8 so that the barrel 37 is positioned on the side of the objective lens 6 of the surgical microscope 1. Figure 4AAs shown, the mirror cover unit 30 is arranged below the housing 8 with the end of the open side of the cylinder 37 facing the lower surface of the housing 8 (in other words, with the end of the open side of the cylinder 37 facing upward). At this time, as shown in FIG. 6B, the movable protrusions 32 are in the state of being most protruded. Figure 4A and Figure 5A As shown, the movable protrusions 32 are in the state of being most protruded.

[0085] Next, as shown in FIG. 6C, the cylinder 37 is tilted with the side on which the movable protrusions 32 are arranged facing upward, and the side surface of the housing 8 presses against the movable protrusions 32, causing the movable protrusions 32 to retract into the cylinder 37 (in other words, reducing the amount of protrusion of the movable protrusions 32) against the urging force of the coil spring 35. On the other hand, at this point, the fixed protrusions 33, 34 do not contact the side surface of the housing 8. Figure 4B

[0086] Next, as shown in FIG. 6D, the tilt of the cylinder 37 is returned to the original state while maintaining the state of the movable protrusions 32 being retracted. By this, the cylinder 37 is covered on the housing 8. Then, by reducing the force in the direction of retracting the movable protrusions 32, the amount of protrusion of the movable protrusions 32 increases, and the leading ends of the fixed protrusions 33, 34 contact the side surface of the housing 8. By this, the mirror cover unit 30 is mounted on the housing 8. At this time, the amount of protrusion of the movable protrusions 32 corresponds to the change in the diameter of the housing 8. Figure 4C Here, the point of the imaginary circle (circle A) that connects the leading ends of the protrusions 32 to 34 when the movable protrusions 32 are most protruded, and the two points of the imaginary circle (circle B) that connects the leading ends of the protrusions 32 to 34 when the amount of protrusion of the movable protrusions 32 is reduced, only slide the amount of protrusion of the movable protrusions 32. Also,

[0087] Figure 5A The diameter D2 of the imaginary circle indicated by the two-dot chain line of the circle B is larger than the diameter Dl of the imaginary circle indicated by the one-dot chain line of the circle A. In other words, by changing the amount of protrusion of the movable protrusions 32, the diameter of the imaginary circle that connects the leading ends of the protrusions 32 to 34 (that is, the diameter of the housing 8) changes. Figure 5B Figure 5B Next, the protective bag body 20 is covered on the surgical microscope 1 and fixed. By this, it is possible to maintain the surgical microscope 1 in a clean state. Figure 5A [Effects of the First Embodiment]

[0088] Through the first embodiment, as shown in FIG. 6E, the mirror cover unit 30 is arranged on the housing 8, and the protective bag body 20 is arranged on the mirror cover unit 30. By this, the surgical microscope 1 is covered by the protective bag body 20, and the mirror cover unit 30 is arranged on the housing 8. By this, it is possible to maintain the surgical microscope 1 in a clean state.

[0089] [Effects of the First Embodiment]

[0090] Through the first embodiment, as shown in FIG. 6E, the mirror cover unit 30 is arranged on the housing 8, and the protective bag body 20 is arranged on the mirror cover unit 30. By this, the surgical microscope 1 is covered by the protective bag body 20, and the mirror cover unit 30 is arranged on the housing 8. By this, it is possible to maintain the surgical microscope 1 in a clean state. Figures 4A-5B ​​​As shown, with the movable protrusion 32 pressed against the side of the housing 8 and retracted into the cylinder 37, the lens cover unit 30 can be assembled onto the housing 8 by the cylinder 37 covering the housing 8. This simplifies the assembly process of the surgical microscope 1 compared to the various lens cover units illustrated in Patent Document 5. Furthermore, as with the various lens cover units illustrated in Patent Document 5, since large elastic deformation is not required when assembling them onto the surgical microscope 1, the force required during assembly can be reduced.

[0091] Furthermore, by implementing the above-described configuration, having three protrusions 32-34 allows the lens cover unit 30 to be stably assembled onto the housing 8 compared to having two. Moreover, having only the minimum necessary number of three protrusions simplifies the configuration of the lens cover unit 30.

[0092] Furthermore, through the above-described embodiment, by making the gap L2 between the fixed protrusions 33 and 34 narrower than the gap L1 between the movable protrusion 32 and the fixed protrusions 33 and 34, the movable protrusion 32 and the fixed protrusions 33 and 34 can stably clamp the housing 8.

[0093] Furthermore, by assembling the protective lens 36 at the front end of the tube 37 with the objective lens 6 tilted relative to the optical axis L0, reflection or glare of the incident light from the surgical microscope 1 can be prevented. As a result, the surgeon viewing the surgical microscope 1 can be prevented from being hindered during surgery due to reflection or glare.

[0094] [Second Implementation Mode]

[0095] Figure 6 An exploded oblique view of the mirror cover unit 40 in the second embodiment, viewed from an oblique top. Figure 7 Figure 8 is an exploded perspective view of the mirror cover unit 40 of the second embodiment, viewed from a downward angle. Figure 9 is an assembled perspective view of the mirror cover unit 40 of the second embodiment. Figure 10 is a longitudinal sectional view of the mirror cover unit 40 of the second embodiment. Further details regarding the commonalities with the first embodiment will not be repeated; explanations will focus on the differences. Also, in both the first and second embodiments, components with common basic functions use the same names.

[0096] like Figures 6-10B As shown, the second embodiment of the mirror cover unit 40 mainly includes a cover body 41, multiple (three in this embodiment) protrusions 42, 43, and 44, an elastic body 42 (an example of a pressure-applying component), and a protective mirror unit 50.

[0097] The cover body 41 is, for example, a resin (e.g., polypropylene) member that is integrally molded with a base plate 46, a cylindrical body 47, and a housing portion 48. The base plate 46 is a flat plate-shaped portion. The base plate 46 has a peripheral edge portion that is welded to the peripheral edge portion of the through-hole 21 of the protective bag body 20. Also, the base plate 46 has a through-hole 46a that extends in the thickness direction. The cylindrical body 47 protrudes from the lower surface of the base plate 46 in a manner that surrounds the through-hole 46a. The housing portion 48 is formed on the lower surface of the base plate 46 in a manner that extends from the outer peripheral surface of the cylindrical body 47.

[0098] The cylindrical body 47 of the second embodiment differs from the cylindrical body 37 of the first embodiment in the following points. First, the end portion of the other side in the axial direction of the cylindrical body 47 is orthogonal to the axial direction of the cylindrical body 47. Also, the cylindrical body 47 has through-holes 47a, 47b, 47c, an abutting ring 47d (abutting portion), and a notch 47e, and a groove 47f formed therein.

[0099] The through-holes 47a to 47c are positioned at intervals in the circumferential direction of the cylindrical body 47 and extend in the thickness direction of the cylindrical body 47. Also, the through-holes 47a to 47c are disposed on the base plate 46 side with respect to the abutting ring 47d in the axial direction of the cylindrical body 47. Next, the through-holes 47a to 47c have the protrusions 42 to 44 described below inserted therein. In other words, the through-hole 47a communicates the internal space of the cylindrical body 47 and the internal space of the housing portion 48. The positions of the through-holes 47b, 47c are common to the arrangement of the protrusions 32 to 34 described in the first embodiment.

[0100] The abutting ring 47d protrudes to the radial direction inner side from the inner peripheral surface of the cylindrical body 47. Also, the abutting ring 47d of the present embodiment is continuous in the circumferential direction. However, the abutting ring 47d can be provided only on a portion of the circumferential direction of the inner peripheral surface of the cylindrical body 47. Next, the abutting ring 47d controls the amount of insertion of the case 8 with respect to the cylindrical body 47 by abutting against the front end of the case 8 that is inserted into the cylindrical body 47 from the base plate 46 side.

[0101] The notch 47e is provided on a portion of the circumferential direction of the cylindrical body 47 (a position at which the housing portion 48 is provided) in the end portion of the other side in the axial direction of the cylindrical body 47 (the side opposite the base plate 46). In other words, the notch 47e sandwiches the abutting ring 47d provided on the side opposite the base plate 46. The notch 47e is a space through which the cover portion 53 of the protective mirror unit 50 passes.

[0102] The groove 47f is provided on the inner peripheral surface of the cylindrical body 47 on the side opposite the base plate 46 that sandwiches the abutting ring 47d. The groove 47f is continuous in the circumferential direction of the cylindrical body 47. However, the groove 47f is broken at the position of the notch 47e. Next, the groove 47f fixes the protective mirror unit 50 to the cover body 41 by receiving the protrusions 54 provided on the ring portion of the protective mirror unit 50.

[0103] The housing portion 48 is a frame-shaped portion that divides the space of the housing elastic body 45. One end of the housing portion 48 in the axial direction is closed via the base plate 46. On the other hand, the other end of the housing portion 48 in the axial direction is configured to be openable and closable via the cover portion 53 of the protective mirror unit 50. Further, the inside of the housing portion 48 is formed with a pin 48a that protrudes from the lower surface of the base plate 46.

[0104] The basic configuration and role of the protrusions 42 to 44 of the second embodiment are common to those of the protrusions 32 to 34 of the first embodiment. Also, the protrusion 42 is a "movable protrusion 42", and the protrusions 43 and 44 are "fixed protrusions 43 and 44". Further, as shown in FIG. 4, the protrusion 42 is configured with a neck portion 42a, a head portion 42b, and an abutting portion 42c. Since the configurations of the protrusions 43 and 44 are also common, the details regarding the protrusion 42 will be described below. Figure 9A

[0105] The neck portion 42a is a portion that passes through the connecting portion 45a of the elastic body 45. The head portion 42b is formed at one end of the neck portion 42a. Also, the head portion 42b is larger than the opening area of the connecting portion 45a. Further, the head portion 42b has a front-end-thinner shape that tapers toward the front end. The abutting portion 42c is formed at the other end of the neck portion 42a. Also, the abutting portion 42c is larger than the opening area of the connecting portion 45a. Further, the abutting portion 42c is a portion that abuts against the outer peripheral surface of the housing 8.

[0106] When the head portion 42b is pressed into the connecting portion 45a from the inner peripheral surface side of the cylinder 47, the head portion 42b having the front-end-thinner shape is elastically compressed through the connecting portion 45a. Next, as shown in FIG. 4, the neck portion 42a is positioned inside the connecting portion 45a, and the abutting portion 42c protrudes inside the cylinder 47. Similarly, when the head portions 43b and 44b are pressed into the through holes 47b and 47c from the inner peripheral surface side of the cylinder 47, the head portions 43b and 44b having the front-end-thinner shape are elastically compressed through the through holes 47b and 47c. Next, the neck portions 43a and 44a are positioned inside the through holes 47b and 47c, the head portions 43b and 44b are positioned outside the cylinder 47, and the abutting portions 43c and 44c are positioned inside the cylinder 47. Figure 9A

[0107] The elastic body 45 is another example of a pressing member that presses the movable protrusion 42 in the protruding direction from the inner peripheral surface of the cylinder 47. In other words, the pressing member is not limited to the coil spring 35 of the first embodiment, and various shapes can be employed. As shown in FIG. 5 and FIG. 6, for example, the elastic body 45 is a member made of resin (e.g., polyacetal) that is integrally formed with the connecting portion 45a, the fixed portion 45b, and a pair of plate springs 45c and 45d. Figure 6 Figure 7

[0108] ​​​​The connecting portion 45a is a portion having an opening of the head portion 42b of the connecting protrusion 42. The fixing portion 45b is a portion that fixes the elastic body 45 in the housing portion 48 by receiving the pin 48a. The plate springs 45c, 45d are portions that are elastically compressed with one end connected to the connecting portion 45a and the other end connected to the fixing portion 45b. Next, by assembling the movable protrusion 42 to the connecting portion 45a, the pin 48a is inserted into the fixing portion 45b, and as shown in Figure 8A and Figure 10A the movable protrusion 42 protrudes from the inner peripheral surface of the cylindrical body 47 to the radial direction inner side.

[0109] The protective mirror unit 50 is a member that fixes the protective mirror 52 to the cover body 41 in a state inclined to the optical axis L0. As shown in Figure 6 and Figure 7 the protective mirror unit 50 is, for example, a member made of resin (for example, polycarbonate) that is integrally molded with the ring portion 51, the protective mirror 52, and the cover portion 53.

[0110] The ring portion 51 has an outer shape of a roughly cylindrical shape. The ring portion 51 is a portion that is inserted into the cylindrical body 47. In other words, the outer diameter dimension of the ring portion 51 is set to be the same as or slightly smaller than the inner diameter dimension of the cylindrical body 47. Also, the outer peripheral surface of the ring portion 51 is formed with a ridge 54. The ridge 54 protrudes from the outer peripheral surface of the ring portion 51 to the radial direction outer side and is provided so as to extend in the circumferential direction of the ring portion 51. Next, when the ring portion 51 is inserted into the cylindrical body 47, the protective mirror unit 50 is fixed to the cover body 41 by the ridge 54 entering the groove 47f. However, the method of fixing the protective mirror unit 50 to the cover body 41 is not limited to this, and adhesion, fusion, bolt connection, or a combination of these can also be used.

[0111] The basic configuration and role of the protective mirror 52 of the second embodiment are common to those of the protective mirror 36 of the first embodiment. The protective mirror 52 is located inside the ring portion 51. In detail, the protective mirror 52 is disposed in the ring portion 51 in a state inclined to the optical axis L0 when the protective mirror unit 50 is fixed to the cover body 41.

[0112] The cover portion 53 is a portion that protrudes from a portion of the ring portion 51 to the radial direction outer side in the circumferential direction. Next, when the cover portion 53 is inserted into the cylindrical body 47 in the ring portion 51, the housing portion 48 is closed. Thereby, the falling of the elastic body 45 is prevented.

[0113] The same action and effect as those of the first embodiment can also be obtained by the second embodiment. Also, by the second embodiment, the cylindrical body 47 is covered to the housing 8 with the front end of the housing 8 abutting against the abutting ring 47d, and the objective lens 6 and the protective mirror 52 are still set at an appropriate distance. As a result, the assembly work of the micro protective bag 10 of the surgical microscope 1 becomes easier.

Claims

1. A micro-protected bag, characterized in that, Comprising: a cap unit detachably attached to a housing of an objective lens of a surgical microscope; a protective mirror protecting the objective lens; and a protective bag body covering the surgical microscope, wherein the cap unit comprises: a cylindrical body having an inner diameter larger than the housing; a plurality of protrusions protruding from an inner circumferential surface of the cylindrical body to an inner radial side at positions spaced apart in a circumferential direction of the cylindrical body; and a pressing member pressing the protrusions supported to be retractable in the cylindrical body in a direction in which the protrusions protrude from the inner circumferential surface of the cylindrical body, the protective mirror is supported at a front end of the cylindrical body in an inclined state with respect to an optical axis of the objective lens, the plurality of protrusions comprises: one movable protrusion supported to be retractable in the cylindrical body; and two fixed protrusions fixed in a state of protruding from the inner circumferential surface of the cylindrical body, the two fixed protrusions are spaced apart in the circumferential direction of the cylindrical body more closely than the movable protrusion and the fixed protrusions.

2. The micro protective bag according to claim 1, wherein the cap unit comprises a cap body integrally formed with the cylindrical body and a housing portion extending from an outer circumferential surface of the cylindrical body and housing the pressing member, the cylindrical body is formed with a through hole communicating with the housing portion, the micro protective bag further comprises: a protective mirror unit fixing the protective mirror to the cap body in an inclined state with respect to the optical axis, the protective mirror unit is integrally formed with a ring portion inserted into the cylindrical body, the protective mirror positioned inside the ring portion, and a cover portion closing the housing portion when the ring portion is inserted into the cylindrical body.

3. The micro protective bag according to claim 2, wherein the inner circumferential surface of the cylindrical body is formed with a groove extending in the circumferential direction, an outer circumferential surface of the ring portion is formed with a ridge extending in the circumferential direction and entering the groove.

4. The micro protective bag according to claim 2, wherein the cap body is formed of polypropylene, the protective mirror unit is formed of polycarbonate.

5. The micro protective bag according to claim 1, wherein the cap unit comprises an abutting portion protruding from the inner circumferential surface of the cylindrical body to the inner radial side and abutting a front end of the housing.

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