JP7103611B1 - Fittings and cover unit - Google Patents

Abstract

A fitting that allows a cover made of an elastically deformable material to be easily and reliably fitted to a distal end portion of a medical treatment instrument, and a cover unit equipped with such a fitting. offer. Kind Code: A1 A mounting tool having a hollow tubular shape, which is used for externally inserting an elastically deformable cylindrical cover for covering the distal end portion of a treatment instrument over the distal end portion of the treatment instrument, and which has an insertion end. and a guide portion having an insertion guide surface and an outer peripheral surface not covered by the cover. A detachable structure is provided so that the cover can be detached from the cover after the cover is externally inserted onto the distal end of the treatment instrument, and in a state where the cover is externally inserted, the direction of the central axis of the hollow cylindrical shape on the holding surface facing the inner surface of the cover. The guide part and the holding part are deformable so that the diameter of the circumscribed circle of the cross section perpendicular to the center axis direction of the hollow cylindrical shape increases as the distance from the insertion end part increases. [Selection drawing] Fig. 1A

Description

The present invention relates to a cover unit including a cover for covering the tip of a treatment tool in a medical treatment tool such as surgery, and a fitting for attaching the cover to the tip of the treatment tool, and the fitting.

The treatment tool used at the time of surgery has a precise structure, and depending on the type, it may be energized or air may be supplied at a predetermined pressure. Therefore, in order to maintain the function of the treatment tool and avoid direct contact with the surgical site or the like, a cover that covers at least the tip of the treatment tool to be inserted into the patient's body may be attached. For example, in the surgical instrument described in Patent Document 1, a part at the tip of the treatment tool is covered with a locking tip cover. The locking tip cover includes an outer cover and a locking device, and the outer cover is made of a non-conductive flexible material. The tip cover is locked to the treatment tool by engaging the screw thread formed on the inner surface of the locking device with the screw thread provided on the treatment tool side.

Patent Document 2 discloses that when performing an operation, a wearing assisting tool is used when the treatment tool protective cover sheath is attached to the treatment tool. As shown in FIG. 7, the mounting auxiliary tool 70 is provided on the auxiliary tool main body 71, the U-shaped protrusion 72 provided on the auxiliary tool main body 71, and the auxiliary tool main body 71 provided on the protrusion 72. It is provided with a notch 73 penetrating the. The maximum outer diameter of the protrusion 72 is formed to be larger than the inner diameter of the base end portion of the treatment tool protective cover sheath 55. The handle 48 of the treatment tool protective cover sheath 55 is elastically deformed and attached to the protrusion 72. In the state where the treatment tool protective cover sheath 55 is attached to the attachment auxiliary tool 70 by the handle portion 48 in this way, the treatment tool is inserted from the notch portion 73. The mounting aid 70 can secure a space on the rear end side of the treatment tool protective cover sheath 55 so that the treatment portion of the treatment tool can be easily inserted into the lumen of the tube body 56.

Patent Document 3 describes a tubular, thin sheet for covering a medical device in a pre-sterilized medical sterility cover for isolating unwashed, disinfected, and unsterilized parts of a medical device for treatment or observation. A ring-shaped storage box in which an insertion portion through which the medical device is inserted is formed in the center for storing the sheet, and a fixing means for fixing the sheet of the portion not stored in the storage box to the medical device. A medical sterility cover is disclosed, wherein the fixing means can be set in the vicinity of the insertion portion. It is described in Patent Document 3 that this storage box may be separable into two bodies.

Special Table 2016-531675 Japanese Unexamined Patent Publication No. 2006-525034 Japanese Unexamined Patent Publication No. 7-204211

In the field of surgery with the cover attached to the treatment tool, in order to ensure the sterility of each treatment tool and to perform quick treatment, the cover should be attached to the unused sterilized treatment tool and the treatment should be performed. It is required to perform the work such as removing the cover from the treatment tool afterwards in a short time and surely. However, when attaching the cover, the practitioner must hold the elongated treatment tool with one hand and attach the cover with the other hand. Therefore, with the conventional cover, the treatment is performed while being in close contact with the tip of the treatment tool. It is difficult to move the cover in the longitudinal direction of the tool. In particular, when the tip of the treatment tool is uneven, or when the cover is made of a soft material that can be elastically deformed in order to improve the adhesion to the tip of the treatment tool, the work of attaching the cover becomes more difficult. For this reason, in the work of attaching the cover, it may be necessary for the practitioner to attach the cover with both hands while the assistant holds the treatment tool, which not only makes it impossible to attach the cover smoothly, but also performs surgery. It may affect the progress of the operation.

Patent Document 2 discloses that the mounting aid 70 is used when mounting the treatment tool protective cover sheath 55 on the treatment tool, but the handle portion 48 is configured to be harder than the tube body 56. Therefore, it is not easy to attach the handle portion 48 to the protrusion 72 that protrudes straight from the auxiliary tool main body 71 with an outer diameter D along the insertion direction of the treatment tool. Further, when the protrusion 72 and the handle 48 are removed after the treatment tool is inserted from the protrusion 72, the inner diameter of the handle 48 is already enlarged from the normal state and the protrusion 72 is inserted. There is. Further, since the protruding portion 72 is inserted into the handle portion 48, the diameter of the end portion of the tube body 56 connected to the handle portion 48 is also expanded, so that the protruding portion 72 can be detached from the handle portion 48. If the diameter of the handle portion 48 is further increased, breakage may occur at the end portion of the tube body 56. Breaking of the tube body 56 should be avoided most from the viewpoint of ensuring safety and health in the treatment. Therefore, in the structure disclosed in Patent Document 2, the protrusion 72 is moved so as to be pulled out from the handle 48, and the protrusion 72 and the handle 48 are separated from each other.

However, when the treatment tool is inserted into the tube body 56, the protrusion 72 and the handle 48 are in close contact with each other so strongly that they do not separate due to the sliding friction even if the treatment tool moves while being in contact with the inner surface of the tube body 56. ing. Therefore, even when the protrusion 72 is moved so as to be pulled out from the handle 48 to separate the protrusion 72 and the handle 48, the end portion of the tube body 56 which is continuously provided and expanded in diameter to the handle 48. May be heavily loaded.

As described above, the separation between the protrusion 72 and the handle 48 disclosed in Patent Document 2 needs to be performed extremely carefully so that the tube 56 is not broken. For this reason, the concentration of the treatment staff, which should be used for the treatment on the patient, is dispersed in this separation work. Therefore, the mounting aid 70 disclosed in Patent Document 2 is required to be further improved.

Therefore, the present invention relates to a fitting that enables a cover made of an elastically deformable material to be easily and surely attached to the tip of a medical treatment tool, and a cover provided with such a fitting. The purpose is to provide a unit.

In order to solve the above problems, the wearing tool of the present invention is used to externally attach an elastically deformable cylindrical cover to the tip of the treatment tool to cover the tip of the treatment tool in a medical treatment tool. , A mounting tool having an approximate shape of a hollow cylinder, which consists of an outer peripheral surface starting from an insertion end, which is one end in the central axis direction of the hollow cylinder, and is a holding surface for holding an externally inserted cover. A holding portion having an inner peripheral surface including the other end portion and a guide portion having an insertion guide surface formed of an inner peripheral surface and the outer peripheral surface is not covered with a cover. It has a detachable structure that allows it to be detached from the cover after insertion. However, the guide portion and the holding portion are characterized in that they can be deformed so as to become larger as the distance from the insertion end portion increases along the direction of the central axis of the hollow cylinder shape.

In the mounting tool of the present invention, it is preferable that the inner diameter of the inner peripheral surface of the insertion guide surface is increased toward the other end.

In one form of the mounting tool of the present invention, the mounting tool is composed of a plurality of split members that can be divided with respect to a straight line including a hollow tubular central axis as a detachable structure, and the plurality of split members are separated from each other. It is preferable that the guide portion and the holding portion are deformed so that the guide portion and the holding portion can be detached from the cover.

In the mounting tool of the present invention, the dividing member includes a locking convex portion and a locking concave portion that lock each other with the adjacent dividing members, and the locking convex portion and the locking concave portion engage with each other. It is preferable that all the dividing materials are pushed into the cover in a state of being integrated.

In the attachment of another form of the present invention, a slit as a detachable structure is provided in which a part of the side surface of the hollow tubular shape is cut off from one end to the other, and the slit is formed by an external force. The width can be changed, and after the cover is externally attached to the tip of the treatment tool, an external force is applied to widen the width of the slit, and the guide and holding parts are deformed so that the cover can be removed from the cover. Is preferable.

In the mounting tool of the present invention, it is preferable to have a flange portion extending in the radial direction on the other end side of the holding surface.

In the mounting tool of the present invention, the length of the holding surface in the direction along the central axis of the hollow tubular shape is preferably 3 mm or more and 8 mm or less.

The cover unit of the present invention has an elastically deformable tubular cover for covering the tip of a medical treatment tool, and a hollow tubular cover for attaching the cover to the tip of the treatment tool. A cover unit including a mounting tool, wherein the mounting tool consists of an outer peripheral surface starting from an insertion end portion, which is one end portion in the central axial direction of a hollow cylinder shape, and is a holding for holding the externally inserted cover. After attaching the cover to the holding portion having a surface, the guide portion having an insertion guide surface consisting of an inner peripheral surface including the other end portion and the outer peripheral surface is not covered by the cover, and the tip portion of the treatment tool, the cover is removed from the cover. With a detachable structure that can be separated, the diameter of the circumscribing circle of the hollow cylinder shape on the holding surface facing the inner surface of the cover, which is orthogonal to the central axis direction, is the hollow cylinder when the cover is externally inserted. The guide portion and the holding portion are characterized in that they can be deformed so as to be larger toward the insertion end portion along the central axis direction of the shape.

In the cover unit of the present invention, it is preferable that the inner diameter of the inner peripheral surface of the insertion guide surface is increased toward the other end.

In the cover unit of the present invention, the tip of the treatment tool extends in a cylindrical shape, and the hollow tubular shape is larger than the diameter of the circumscribed circle including the outer shape when the tip of the treatment tool is viewed from the direction of the central axis thereof. It preferably has an inner diameter.

In the cover unit of the present invention, the cover is preferably larger than A20 and less than A70 in hardness according to JIS-K6253.

According to the present invention, a cover made of an elastically deformable material can be easily and surely attached to the tip of a medical treatment instrument, and a cover provided with such an attachment. Units can be provided.

It is a perspective view which shows the structure of the cover unit of 1st Embodiment of this invention. It is a perspective view which shows the state which attaches the fitting to the cover. It is a perspective view which shows the structure of the two split members which make up a fitting. It is a perspective view which shows the state before mounting the cover unit with respect to the tip part of a treatment tool. It is a perspective view which shows the state which a part of the tip side of the tip of a treatment tool is inserted into a cover unit. It is a perspective view which shows the process which the tip part of a treatment tool is inserted into a cover, and the attachment is divided and removed. It is a perspective view which shows the state which the attachment | attachment is removed, and the attachment of the cover to the tip portion of a treatment instrument is completed. It is explanatory drawing which shows the state before removing the fitting from the cover unit which inserted the treatment tool. It is explanatory drawing which shows the state which moved the attachment tool so that the two dividing members are separated in the cover unit which inserted the treatment tool. It is a perspective view which shows the structure of the attachment device in 2nd Embodiment of this invention. It is a perspective view which shows the structure of the attachment device in 2nd Embodiment of this invention. It is explanatory drawing which shows the mounting assisting tool which concerns on the prior art.

Hereinafter, the fitting and the cover unit according to the embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1A is a perspective view showing the configuration of the cover unit 10 according to the first embodiment of the present invention. FIG. 1B is a perspective view showing a state in which the fitting 30 is attached to the cover 20. FIG. 2 is a perspective view showing the configuration of the two dividing members 31 and 32 constituting the mounting tool 30. FIG. 3A is a perspective view showing a state before the cover unit 10 is attached to the treatment tool tip 41, which is the tip of the treatment tool 40 used for medical purposes such as surgery. FIG. 3B is a perspective view showing a state in which a part of the tip end portion 41 of the treatment tool on the tip end side is inserted into the cover unit 10. FIG. 4A is a perspective view showing a process in which the tip portion 41 of the treatment tool is inserted into the cover 20 and the attachment tool 30 is divided and removed. FIG. 4B is a perspective view showing a state in which the attachment tool 30 has been removed and the cover 20 has been attached to the treatment instrument tip portion 41.

As shown in FIGS. 1A and 1B, the cover unit 10 includes a tubular cover 20 and a fitting 30 to which the cover 20 is externally inserted. The fitting 30 has a configuration in which a hollow conical guide portion 34 extends from a hollow cylindrical holding portion 33 extending in the central axis AX2 direction. The mounting tool 30 has a mounting opening, which is one end of the cover 20, in a holding surface 33a formed of an outer peripheral surface of the holding portion 33 starting from the insertion end 33b, which is one end in the central axis AX2 direction of the hollow cylindrical shape. By extrapolating the 22, it is integrated with the cover 20 (FIG. 1A), and in this state, it is attached to the treatment tool tip 41 of the treatment tool 40.

As the material of the cover 20, for example, polyurethane, silicone rubber, ethylene rubber, fluororubber, nitrile rubber, natural rubber, butyl rubber, chloroprene rubber, and isoprene rubber can be used.

The hardness of the rubber of the cover 20 may be set in the range of A20 or more and less than A70, more preferably A30 or more and A60 or less in the hardness according to JIS-K6253. If the hardness of the rubber of the cover 20 is less than A30, there is a concern that the rigidity of the cover 20 may be insufficient. If the rigidity is insufficient, it becomes difficult to maintain the cylindrical shape, and bending due to gravity or the like occurs, so that it becomes difficult to attach the treatment tool 40. On the other hand, if the hardness of the rubber of the cover 20 exceeds A60, there is a concern that it may be difficult to deform in the radial direction of the tubular shape, although it depends on the shape of the cover. If it becomes difficult to deform in the radial direction, it becomes easy to get caught in the unevenness of the treatment tool tip 41 when it is attached to the treatment tool 40, and the wearability becomes low, and after mounting, the adhesion to each part of the treatment tool tip 41 deteriorates. There is a risk of doing so. Even when the hardness of the rubber of the cover 20 is low or high, it is possible to appropriately cover the treatment tool tip 41 of the treatment tool 40 by using the attachment 30.

Both ends of the cover 20 in the direction of the central axis AX1 are openings, and one end opening 21 allows the tip tool portion 42 of the treatment tool tip 41 of the inserted treatment tool 40 to extend. (See FIG. 4A). The end opening 21 has an opening diameter that can be brought into close contact with the outer surface of the extended tip tool portion 42 due to its elasticity.

As shown in FIG. 1B, the fitting 30 has a hollow cylindrical shape as an approximate shape, and the guide portion 34 has a hollow conical shape in which the diameter of the guide portion 34 is expanded toward the end portion from the hollow cylindrical holding portion 33. Has. The outer peripheral surface of the holding portion 33 holds the inner surface of the mounting opening 22 of the cover 20 as the holding surface 33a based on the frictional resistance, whereby the cover 20 is held by the mounting tool 30. The holding surface 33a of the holding portion 33 has an outer diameter larger than the inner diameter of the cover 20. Therefore, since the diameter of the cover 20 is expanded by extrapolating the cover 20 to the holding surface 33a, it becomes easy to introduce the treatment tool tip 41 of the treatment tool 40 into the cover 20. The outer peripheral surface of the guide portion 34 is not covered by the cover 20.

The inner peripheral surface 34a (see FIGS. 1B and 2) of the guide portion 34 as the insertion guide surface has at least the inner diameter of the end having the smallest inner diameter, and the treatment tool tip 41 of the treatment tool 40 is the central axis thereof. The diameter of the circumscribed circle C including the outer shape when viewed from the direction is set to be larger than the diameter D1 (see FIG. 3A). Therefore, the inner diameter of the holding portion 33 connected to the guide portion 34 is also set to be larger than the diameter D1 of the circumscribed circle C. As a result, the end portion having the largest inner diameter of the guide portion 34 has an opening larger than that of the treatment tool tip portion 41 of the treatment tool 40, so that the treatment tool tip portion 41 can be easily introduced into the guide portion 34. Further, since the inner peripheral surface 34a of the guide portion 34 is formed so that the inner diameter becomes smaller toward the holding portion 33, the treatment tool tip portion 41 introduced into the guide portion 34 guides the inner peripheral surface 34a. By doing so, it becomes easy to smoothly move into the cover 20 along the direction in which the fitting 30 extends (the direction of the central axis AX2). Since the holding portion 33 has an inner diameter larger than the maximum diameter of the treatment tool tip 41, the treatment tool tip 41 can be easily moved inside, and the cover 20 is extrapolated to the holding surface 33a of the holding portion 33. Therefore, in the vicinity of the mounting opening 22 of the cover 20, the inner diameter thereof has an inner diameter larger than the maximum diameter of the tip portion 41 of the treatment tool. Therefore, the tip portion 41 of the treatment tool is introduced into the cover 20. It's getting easier.

It is preferable that the fitting 30 is made of a material having a rigidity higher than that of the cover 20 and has durability that can withstand various sterilizations, for example, chemical resistance and heat resistance. Examples of such a material include polyethylene, polypropylene, polystyrene, silicone resin, and polycarbonate.

Here, if a layer having lubricity is provided on the inner peripheral surface 34a of the guide portion 34, the treatment tool 40 moves smoothly in the guide portion 34. Further, if an elastic layer is provided on the inner peripheral surface 34a of the guide portion 34, when the treatment tool 40 is moved in the guide portion 34, this layer is deformed according to the unevenness of the treatment tool 40, so that the treatment tool Damage during movement of 40 can be prevented, and movement can be performed smoothly.

The fitting 30 includes split members 31 and 32 that can be split into two at 180 degrees with respect to the central axis AX2. The dividing members 31 and 32 form a detachable structure that allows the attachment tool 30 to be detached from the cover 20 after the cover 20 is extrapolated to the treatment tool tip 41. As shown in FIG. 2, a locking recess 31a and a locking convex portion 31b are provided at the end of one of the first dividing members 31, and a locking recess is also provided at the end of the other second dividing member 32. 32a and a locking convex portion 32b are provided. When the two dividing members 31 and 32 are arranged so as to correspond to each other in the direction of the central axis AX2 of the mounting tool 30, the locking convex portion 31b of the first dividing member 31 becomes the locking recess 32a of the second dividing member 32. The locking convex portion 32b of the second dividing member 32 engages with the locking recess 31a of the first dividing member 31, and the two dividing members 31 and 32 are fixed to each other by these engagements. Then, as shown in FIG. 1B, a fitting 30 having a shape in which the guide portion 34 expands in diameter from the hollow cylindrical holding portion 33 to a hollow conical shape is formed.

The engagement strength of the two dividing members 31 and 32 is such that, for example, the practitioner grips the outer peripheral surface of the fitting 30 so that the fitting 30 and the cover 20 are extrapolated to the treatment tool tip 41 of the treatment tool 40. On the other hand, in the operation of moving the tip portion 41 of the treatment tool along the extending direction (the direction along the central axis AX3 of the tip portion 41 of the treatment tool), the strength is such that the engagement is not released. On the other hand, when a force of a predetermined magnitude or more is applied in the direction in which the split members 31 and 32 are separated from each other with respect to the central axis AX2 of the fitting 30 while gripping the respective ends of the split members 31 and 32. Is disengaged from the dividing members 31 and 32, and the fitting 30 is divided into two (see FIG. 4A).

The process of attaching the cover 20 to the treatment tool 40 using the cover unit 10 having the above configuration will be described.
First, prior to the treatment, the separately manufactured cover 20 and the fitting 30 are integrated (see FIG. 1A). This work may be performed by a manufacturing worker alone at the manufacturing site of the cover 20 and the fitting 30, for example. Specifically, from the state where the cover 20 and the mounting tool 30 are held by the left and right hands, the holding portion 33 of the mounting tool 30 is pushed into the mounting opening 22 of the cover 20, or the mounting opening 22 is widened. In this state, the holding portion 33 is inserted into the inside. In this way, the cover 20 is extrapolated to the holding surface 33a of the holding portion 33, the holding surface 33a is held in contact with the inner surface of the cover 20, and the cover 20 and the fitting 30 are fixed to each other.

Next, the practitioner holds the cover unit 10 and the treatment tool 40 with his / her left and right hands, and then covers the attachment 30 on the treatment tool tip 41 of the treatment tool 40 as shown in FIG. 3A. Manipulate. From this state, the cover unit 10 is moved along the central axis AX3 of the tip portion 41 of the treatment tool while maintaining the position of the treatment tool 40 (FIG. 3B). Then, when the tip portion 41 of the treatment tool is housed in the cover 20 and the tip tool portion 42 extends from the end opening 21 of the cover 20, as shown in FIG. 4A, the two dividing members 31 of the mounting tool 30 , 32 are separated from each other, removed from the cover 20 and the treatment tool 40, and the attachment of the cover 20 to the treatment tool tip 41 of the treatment tool 40 is completed (state of FIG. 4B).

Since it is configured as described above, according to the above embodiment, the following effects are obtained.
Since the cover 20 is difficult to be deformed when the hardness of the rubber is high, it is difficult to insert the cover 20 so as to cover the treatment tool tip 41 of the treatment tool 40. On the other hand, when the constituent material of the cover 20 is soft, although it is easily deformed, it easily bends, so that it is not easy to cover the tip portion 41 of the treatment tool having a predetermined length. Therefore, by extrapolating the mounting opening 22 which is one opening of the cover 20 to the holding portion 33 of the mounting tool 30, the inner diameter of the mounting opening 22 of the cover 20 is adjusted to the tip portion 41 of the treatment tool of the treatment tool 40. It is possible to expand and hold the outer diameter (diameter D1 of the circumscribed circle C) or more. Therefore, the cover 20 can be easily extrapolated to the treatment tool 40. At this time, since the mounting tool 30 is provided with the inner peripheral surface 34a as the insertion guide surface, it is particularly easy to insert the treatment tool 40 into the mounting tool 30.

Further, when the cover 20 is moved so as to cover the treatment tool tip 41 of the treatment tool 40 by an appropriate frictional force generated between the holding surface 33a and the cover 20, between the cover 20 and the treatment tool 40. By grasping the mounting tool 30 and moving it along the axial direction of the treatment tool 40 in order to overcome the frictional resistance generated in the treatment tool 40, it is easily realized that the treatment tool tip portion 41 is covered with the cover 20.

Further, since the attachment 30 has a detachable structure, the attachment 30 can be detached from the cover 20 without shifting the position of the cover 20 covering the tip portion 41 of the treatment instrument.

The details of the work of detaching the fitting 30 from the cover 20 in the cover unit 10 according to the present embodiment will be described with reference to FIGS. 5A and 5B. FIG. 5A is an explanatory view showing a state before removing the attachment from the cover unit into which the treatment tool is inserted. FIG. 5B is an explanatory view showing a state in which the fitting is moved so that the two dividing members are separated in the cover unit into which the treatment tool is inserted.

As shown in FIG. 5A, when the treatment tool 40 is inserted into the cover unit 10, the outer peripheral surface (holding surface 33a) of the portion of the dividing members 31 and 32 that constitutes the holding portion 33 is covered with the cover 20. The outer periphery of the portion constituting the guide portion 34 is not covered by the cover 20.

In this state, when an external force F0 is applied so as to separate the split member 31 and the split member 32 of the mounting tool 30, as shown in FIG. 5B, the portion of the split members 31 and 32 that constitutes the guide portion 34 becomes. It is preferentially separated, and the degree of separation of the portions constituting the holding portion 33 is relatively low. By separating the dividing members 31 and 32 as described above, the fitting 30 to which the cover 20 is circumscribed has a cross section orthogonal to the central axis AX2 direction of the hollow tubular shape on the holding surface 33a facing the inner surface of the cover 20. The diameter of the circumscribed circle is deformed so as to increase away from the insertion end 33b along the direction of the central axis AX2 of the hollow cylinder shape. By pulling the fitting 30 in the deformed state in the direction of the central axis AX2, the fitting 30 comes off from the cover 20 and comes out.

In the structure disclosed in Patent Document 2, since the U-shaped protrusion 72 protrudes from the plate-shaped auxiliary tool main body 71, the auxiliary tool main body 71 is in a state where the protrusion 72 is covered with the handle portion 48. , The rear end distal to the protective cover sheath 55 cannot be deformed to open preferentially. Therefore, as described above, the protrusion 72 is separated from the handle 48 by pulling the auxiliary tool main body 71 while holding the tube body 56 to which the handle 48 is continuously provided. As described above, there is a high risk of damage to the tube body 56 in such a method.

An unlimited example of the length of the holding surface 33a in the direction of the central axis AX2 of the mounting tool 30, that is, the fitting length to the cover 20, is 3 mm or more and 8 mm or less. If the fitting length to the cover 20 is excessively short, the frictional force between the holding surface 33a as the holding surface and the cover 20 becomes low. Therefore, when the fitting 30 is gripped and pulled, the cover 20 is treated. It may be difficult to move the tool 40 together with the tool 40. On the other hand, if the fitting length is excessively long, it may not be easy to extrapolate the cover 20 so as to cover the entire holding surface 33a. Further, when the attachment 30 is removed after the cover 20 is attached to the treatment tool 40, the cover 20 covering the holding surface 33a is deformed so as to be stretched to remove the attachment 30 from the cover 20, so that the fitting length is excessively long. Then, the resistance when removing the cover 20 becomes too large, and the attachment 30 may not be easily detached.

The longer the guide portion 34 in the direction of the central axis AX2 of the mounting tool 30, the easier it is to separate the mounting tool 30 from the cover 20 even if the external force F0 for separating the mounting tool 30 is small. If the guide portion 34 is excessively long, there is a high possibility that interference with a member arranged in the vicinity of the treatment tool 40 will occur. Further, when an external force F0 is applied to the portions forming the guide portion 34 of the dividing material 31 and the dividing material 32, the portions forming the holding portion 33 of the dividing material 31 and the dividing material 32 are appropriately divided. It is preferable that at least one of the dividing member 31 and the dividing member 32 has a high rigidity (bending strength) sufficient to withstand the elastic recovery force of the cover 20.

A modified example of the first embodiment will be described below.
The attachment 30 of the above embodiment is configured to be divided into two dividing members 31 and 32, but the number of divisions may be three or more with respect to the central axis AX2 of the attachment 30.

In the mounting tool 30 of the first embodiment, the inner diameter of the guide portion 34 is increased, but the inner diameter of the guide portion 34 is constant as long as it is the same as or larger than the diameter D1. May be.

Subsequently, the second embodiment of the present invention will be described. The fitting 130 according to the second embodiment has a slit 131 as shown in FIGS. 6A and 6B, unlike the fitting 30 of the first embodiment. 6A and 6B are perspective views of the configuration of the fitting 130 according to the second embodiment as viewed from different directions. The mounting tool 130 shown in FIGS. 6A and 6B has a hollow cylindrical shape as an approximate shape like the mounting tool 30 of the above embodiment, and the guide portion 134 has a hollow conical shape from the hollow cylindrical holding portion 133. It is provided in. The guide portion 134 has a configuration in which the diameter is expanded toward the flange portion 132 as a grip portion provided at the end portion of the mounting tool 130 so as to spread substantially in a disk shape from the central axis AX4 of the mounting tool 130 to the outside in the radial direction. Has. The holding surface 133a of the holding portion 133 holds the inner surface of the mounting opening 22 of the cover 20 as a holding surface, whereby the cover 20 is held by the mounting tool 130.

The diameter of the circumscribed circle (diameter under no load) of the holding surface 133a of the holding portion 133 is larger than the inner diameter of the cover 20 in a state where no external force is applied to the fitting 130. By extrapolating the cover 20 to the holding surface 133a, the diameter of the cover 20 is expanded, so that the treatment tool tip 41 of the treatment tool 40 can be easily introduced into the cover 20.

Here, when the cover 20 is extrapolated to the holding surface 133a, an external force is applied to the guide portion 134 to narrow the slit 131 to reduce the diameter of the circumscribed circle of the holding surface 133a of the holding portion 133, and then the cover 20. By extrapolating, the extrapolation work can be facilitated, and the possibility that the cover 20 will be damaged in this work can be sufficiently reduced. By appropriately setting the diameter when there is no load, the opening angle of the slit 131, and the elastic modulus (Young's modulus) of the holding portion 133, an external force is applied so as to close the slit 131, and after the cover 20 is externally inserted, the external force is applied. The diameter of the tangent circle (diameter at the time of external insertion) of the holding surface 133a of the holding portion 133 when the above is released can be made larger than the inner diameter of the cover 20. As a result, the treatment tool tip 41 of the treatment tool 40 can be more stably introduced into the cover 20.

The slit 131 is provided so as to extend along the central axis AX4 while penetrating the outer peripheral surfaces of the holding portion 133 and the guide portion 134 in the thickness direction, and further penetrates the corresponding portion of the flange portion 132 in the thickness direction. It is provided as follows. The width of the slit 131 expands as the guide portion 134 expands in diameter, and the flange portion 132 also gradually expands.

The larger the opening angle of the slit 131, the smaller the diameter of the circumscribed circle (diameter during compression) of the holding surface 133a of the holding portion 133 when the slit 131 is closed, but it is located so as to face the slit 131. The inner surface (exposed inner surface) of the cover 20 may come into direct contact with the treatment tool 40 when the treatment tool 40 is inserted. Since a tensile force is applied to the exposed inner surface as the diameter of the cover 20 increases, further elastic deformation is unlikely to occur, and the exposed inner surface is relatively easily damaged. Therefore, from the viewpoint of preventing the cover 20 from being damaged, it is preferable that the area of the exposed inner surface is small, that is, it is preferable that the opening angle of the slit 131 is small. From the viewpoint of the balance between reducing the diameter at the time of compression and reducing the area of the exposed inner surface, the opening angle of the slit 131 is preferably 10 ° or more and 45 ° or less.

In the mounting tool 130 shown in FIGS. 6A and 6B, the cover 20 is extrapolated to the holding surface 133a of the holding portion 133, and the cover unit including the mounting tool 130 and the cover 20 is formed. It is formed. The cover 20 is attached to the treatment tool 40 by extrapolating the guide portion 134 to the treatment tool tip portion 41 in the same manner as in the above embodiment. After the cover 20 is attached to the tip portion 41 of the treatment tool, the practitioner grips the flange portion 132 to increase the diameter while moving the attachment 130 away from the cover 20. The moved mounting tool 130 can be removed from the treatment tool 40 by grasping the flange portion 132 and further expanding the diameter.

In the present embodiment, when an external force F0 for gripping and expanding the diameter of the flange portion 132 located at the rear end of the fitting 130 is applied, the side of the guide portion 134 not covered by the cover 20 near the flange portion 132 becomes The diameter is increased in the same manner as the flange portion 132, but the degree of diameter expansion is relatively low on the side of the guide portion 134 near the holding portion 133. This is because the holding surface 133a is covered with the cover 20, so that the elastic recovery force of the cover 20 acts on the holding portion 133 from the holding surface 133a. Due to the difference in the degree of diameter expansion in the central axis A4 direction, the guide portion 134 is twisted and the holding surface 133a is distorted. By pulling the fitting 130 in which the guide portion 134 is twisted in the direction of the central axis AX4, the holding portion 133 comes off from the cover 20. From the viewpoint of easily causing the guide portion 134 to be twisted, the spring constant for deforming the slit 131 in the member constituting the fitting 130 in the direction of decreasing the opening angle is 1 N / mm or more and 20 N / mm or less. It is preferably 3 N / mm or more and 15 N / mm or less.

In the structure disclosed in Patent Document 2, since the U-shaped protrusion 72 corresponds to the holding portion 133 and the guide portion 134 of this example, the guide portion 134 is twisted and the holding surface 133a is distorted as in the present embodiment. Is unlikely to occur. Therefore, as described above, the protrusion 72 is separated from the handle 48 by pulling the auxiliary tool main body 71 while holding the tube body 56 to which the handle 48 is continuously provided. As described above, such a method has a high risk of breaking the tube body 56.

Although the present invention has been described with reference to the above-described embodiment, the present invention is not limited to the above-described embodiment, and can be improved or modified within the purpose of improvement or the idea of the present invention.

For example, a flange portion as shown in FIGS. 6A and 6B may be provided at the end portion of the mounting tool 30 of the first embodiment. As a result, the cover unit 10 can be easily moved by gripping and operating the flange portion when extrapolating to the treatment tool 40. In this case, the grip portion for gripping the mounting portion at the time of extrapolation to the treatment tool 40 may have a shape other than the flange portion.

10 Cover unit 20 Cover 21 End opening 22 Mounting opening 30 Mounting tool 31 First dividing material 32 Second dividing material 31a, 32a Locking recess 31b, 32b Locking convex part 33 Holding part 33a Holding surface 33b Insertion end 34 Guide part 34a Inner peripheral surface (insertion guide surface)
40 Treatment tool 41 Treatment tool tip 42 Tip tool 48 Handle 55 Treatment tool Protective cover sheath 56 Tube body 70 Mounting aid 71 Auxiliary body 72 Protrusion 73 Notch 130 Mounting tool 131 Slit 132 Flange part 133 Holding part 133a Holding surface 133b Insertion end 134 Guide part AX1 Central axis of cover AX2, AX4 Central axis of fitting AX3 Central axis of treatment tool tip C Circumscribed circle D Outer diameter of protrusion D1 Diameter of circumscribed circle F0 External force

Claims (13)

An elastically deformable tubular cover for covering the tip of a treatment tool in a medical treatment tool, which is used to extrapolate the tip of the treatment tool and has a hollow tubular shape. ,
The inside including a holding portion having a holding surface for holding the extrapolated cover, which is composed of an outer peripheral surface starting from an insertion end portion which is one end portion in the central axial direction of the hollow cylinder shape, and the other end portion. It is provided with a guide portion having an insertion guide surface composed of a peripheral surface and the outer peripheral surface is not covered by the cover.
The attachment has a detaching structure that detaches from the cover by receiving an external force while the cover is extrapolated to the tip of the treatment instrument.
In the detachment structure,
The diameter of the circumscribing circle of the cross section orthogonal to the central axis direction of the hollow cylinder shape on the holding surface facing the inner surface of the cover increases as the distance from the insertion end portion along the central axis direction of the hollow cylinder shape. The mounting tool is characterized in that the guide portion and the holding portion are deformed by the external force so that the mounting tool is detached from the cover . The mounting tool according to claim 1, wherein the insertion guide surface has an inner diameter of an inner peripheral surface that increases toward the other end. As the detachable structure, the mounting tool is composed of a plurality of dividing members that can be divided with respect to a straight line including the central axis of the hollow cylinder shape, and the plurality of dividing members are separated by the external force. The fitting according to claim 1 or 2, wherein the guide portion and the holding portion are deformed. The dividing member includes a locking convex portion and a locking concave portion that lock each other with the adjacent dividing members.
The fitting according to claim 3, wherein the dividing member is pushed into the cover in a state where all the dividing members are integrated by engaging with each other at the locking convex portion and the locking concave portion. A slit as the detachment structure is provided, in which a part of the side surface of the hollow cylinder shape is cut off from one end to the other end.
The width of the slit can be changed by the external force, and after the cover is extrapolated to the tip of the treatment tool, the external force is applied to widen the width of the slit, so that the guide portion and the holding portion are formed. The fitting according to claim 1 or 2, which is deformed. The fitting according to any one of claims 1 to 5, which has a flange portion extending in the radial direction on the other end side of the holding surface. The fitting according to any one of claims 1 to 6, wherein the length of the holding surface in the direction along the central axis of the hollow cylinder shape is 3 mm or more and 8 mm or less. An elastically deformable tubular cover to cover the tip of the medical treatment tool,
A cover unit that is used to attach the cover to the tip of the treatment tool and includes a mounting tool having a hollow tubular shape.
The fitting is
A holding portion consisting of an outer peripheral surface starting from an insertion end portion, which is one end portion in the central axial direction of the hollow cylinder shape, and having a holding surface for holding the extrapolated cover.
A guide portion having an insertion guide surface composed of an inner peripheral surface including the other end portion and whose outer peripheral surface is not covered by the cover.
A detachable structure that detaches from the cover by receiving an external force while the cover is extrapolated to the tip of the treatment tool.
With
In the detachment structure,
The diameter of the circumscribing circle of the cross section orthogonal to the central axis direction of the hollow cylinder shape on the holding surface facing the inner surface of the cover increases as the distance from the insertion end portion along the central axis direction of the hollow cylinder shape. The cover unit is characterized in that the mounting tool is detached from the cover by deforming the guide portion and the holding portion by the external force . The cover unit according to claim 8, wherein the insertion guide surface has an inner diameter of an inner peripheral surface that increases toward the other end. The tip of the treatment tool extends in a tubular shape and
The cover unit according to claim 9, wherein the hollow tubular shape has an inner diameter larger than the diameter of the circumscribed circle including the outer shape when the tip of the treatment tool is viewed from the direction of the central axis thereof. The cover unit according to any one of claims 8 to 10, wherein the cover is larger than A20 and less than A70 in hardness according to JIS-K6253. The third aspect of the present invention, wherein the external force includes a force for separating the plurality of divided members and a force for pulling the separated attachment in the direction of the central axis of the attachment when the attachment is in the attachment state. Wearing tool. The mounting tool according to claim 5, wherein the external force includes a force for expanding the diameter of a flange portion located at an end distal to the cover in the mounting tool.

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