JP2001128985A - Trocar cannula - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trocar cannula capable of keeping air-tightness in the interior of the cannula regardless of the size of a medical instrument inserted in the inside of the cannula and its arrangement condition. SOLUTION: This trocar cannula 1 used together with an inner needle has an insert part 3 having a conduit 2 inside, a holding part 4 provided on the base end side of the insert part 3, and a seal member 6 as a sealing means for keeping the air-tightness of a chamber 5 in the holding part 4. The seal member 6 formed of an elastic material has an instrument insert part 21 provided with an insert part opening 20 as an opening through which a medical instrument is passed, and a seal ring 22 as an opening reducing means for energizing the bore diameter of the opening 20 to be reduced is fitted to the outer periphery thereof. When the medical instrument is inserted in the opening 20, the seal ring 22 fastens the insert part 21 toward the radial inside regardless of the size of the outside diameter and the arrangement condition, whereby the opening edge 20a is made closely adhere to the outer periphery of the medical instrument to keep the air-tightness in the holding part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trocar outer tube which penetrates a body wall and penetrates into a body cavity, and guides a medical instrument such as an optical viewing tube or a treatment tool into the body cavity.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Laid-Open Publication No. 5-86305, for example, a general trocar mantle tube is punctured into the skin which is a body wall of a patient by combining a trocar inner needle having a sharp tip. Consisting of an elongated insertion part having a conduit that penetrates into the body cavity and guides medical instruments such as an optical sight tube and a treatment tool into the body cavity, and a holding part provided on the hand side of the insertion part The holding portion has a main body connected to the proximal side of the insertion portion, a lid hermetically connected to the main body, and a rubber cap hermetically attached to the lid.

[0003] The lid is provided with an opening serving as an entrance for introducing or pulling out a medical instrument such as an optical sight tube or a treatment tool, and inside the lid,
A flap valve urged by a spring to close its opening when no force is applied from the outside, and a packing for keeping the inside of the main body airtight by tight contact between the flap valve and the lid And so on.

The rubber cap is made of an elastic material, and is detachably fitted and attached so as to cover the opening of the lid tightly from the outer periphery thereof. At the same time, the rubber cap has an opening for introducing a medical instrument such as a telescope or a treatment tool into the inside of the trocar mantle, which is the same as the opening of the lid when the rubber cap is attached to the lid. It is provided at a position on the axis.

[0005] According to the trocar mantle tube having the above-described structure, when a medical instrument such as an optical viewing tube or a treatment tool is not introduced into the main body, the flap valve is brought into close contact with the packing. It is urged by an urging spring to keep the inside of the main body airtight. In addition, when a medical instrument such as an optical sight tube or a treatment tool is pushed through the opening of the rubber cap and the flap valve is pushed open inside the main body of the trocar mantle tube, the opening edge portion of the rubber cap is opened. The airtightness inside the main body is maintained by closely contacting the outer peripheral portion of a medical instrument such as a treatment instrument.

[0006]

When a medical instrument such as an optical viewing tube or a treatment tool having a diameter smaller than the diameter of the conduit of the insertion portion is inserted into the trocar mantle tube as described above, the medical device is used. During operation of the instrument, the medical instrument may shift or tilt with respect to the axial direction of the trocar mantle tube. In such a case, the opening edge of the rubber cap for keeping the inside of the trocar mantle in close contact with the outer periphery of the inserted medical instrument cannot keep up with the deviation or inclination of the medical instrument, and the rubber cap is not provided. In some cases, there is a gap between the opening edge portion of the trocar and the outer periphery of the medical device, so that the airtightness inside the main body of the trocar jacket cannot be maintained.

[0007] Accordingly, an object of the present invention is to provide a trocar mantle tube which can maintain the airtightness of the inside of the trocar mantle tube regardless of the size of the medical instrument inserted into the inside of the trocar mantle or the arrangement state thereof. Is to get

[0008]

In order to solve the above-mentioned problems, a trocar mantle tube according to the first aspect of the present invention is provided with a medical device such as an optical viewing tube or a treatment tool, which is inserted into a body cavity by assembling an inner needle. A trocar mantle tube for guiding an instrument into a body cavity, comprising an elongated insertion portion having a channel inside, a holding portion provided on a proximal end side of the insertion portion, and airtightness of a chamber in the holding portion. Elastically deformable sealing means, and the sealing means has an opening through which the medical device is inserted, and an opening reducing means for urging the opening to reduce the diameter of the opening. It is a feature.

In this trocar outer tube, the sealing means is elastically deformable and has an opening reducing means for urging the opening provided in the sealing means to reduce the diameter. Thereby, the outer periphery of the medical device and the edge of the opening are in close contact with each other in accordance with the size of the outer shape of the medical device such as an optical sight tube or a treatment tool inserted into the holding portion, that is, the inside of the trocar mantle tube. The diameter of the opening of the sealing means can be changed so that the state can be maintained. Also, since the sealing means can be elastically deformed,
Even if the medical device shifts or tilts inside the trocar mantle tube, the opening follows the movement,
By the opening reducing means, the outer periphery of the medical device and the edge of the opening can be kept in close contact with each other. Therefore, the airtightness inside the trocar mantle tube can be maintained regardless of the size of the medical instrument inserted into the inside of the trocar mantle tube and the arrangement state thereof.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> A trocar mantle tube 1 according to a first embodiment of the present invention will be described with reference to FIGS.
A description will be given based on FIG.

As shown in FIGS. 1 and 2, the trocar mantle tube 1 has an elongated insertion portion 3 having a conduit 2 therein,
A holding portion 4 is provided on the base end side of the insertion portion 3, and a sealing member 6 as a sealing means for keeping the chamber 5 in the holding portion 4 airtight.

Inside the trocar outer tube 1, an elongated needle portion 7 is provided at a distal end portion as one end portion, and an inner needle main body 8 is provided at a proximal end portion as the other end portion. The provided inner needle 9 is detachably attached.

The insertion section 3 has a pipe 2 having both ends opened therein. The proximal side of the pipe 2 communicates with a chamber 5 provided in the holding section 4.

At the proximal end of the holding portion 4, a holding portion opening 4a communicating with the chamber 5 is provided. The inner needle 9 is inserted into the conduit 2 through the chamber 5 through the holding portion opening 4a. When the inner needle main body 8 is fixed to the holding section 4, the distal end of the needle section 7 projects forward from the distal opening 3 a of the insertion section 3. A sharp blade portion 10 is formed at the tip of the needle portion 7 of the inner needle 9, and this blade portion 10 can puncture and penetrate a human body tissue (not shown).

In the interior of the chamber 5, between a position crossing perpendicularly to the axial direction of the trocar mantle tube 1 and a position substantially parallel to the axial direction and deviating from the extension of the pipe line 2, Along the direction indicated by arrow A in FIG.
A flap valve 11 rotatable in a range of 0 ° is provided, and the holding portion opening 4a is airtightly closed or the holding portion opening 4a is provided.
It is set up so that you can open it.

When no external force acts on the flap valve 11, the flap valve 11 is rotated by a helical biasing spring 12 as shown by a chain line in FIG. It is biased to a position crossing perpendicularly to the direction. Thus, the flap valve 11 hermetically closes the holding portion opening 4a.

The flap valve 11 is provided with an open / close button 13 projecting out of the holding portion 4 and slidable with respect to the holding portion 4 in a direction perpendicular to the axial direction thereof. Are connected via By pushing the open / close button 13 toward the holding portion 4 along the direction indicated by the arrow B in FIG. 2, the direction against the urging force of the urging spring 12 is indicated along the direction indicated by the arrow A in FIG. 2. The flap valve 11 can be rotated. This allows
The flap valve 11, as shown by a solid line in FIG.
The holding portion opening 4a can be opened. Alternatively, as shown in FIG. 2, the inner needle 9 or the medical device is inserted by inserting the inner needle 9 into the chamber 5 through the holding portion opening 4a or inserting a medical instrument such as an optical viewing tube or a treatment tool (not shown). The tip of the instrument can push the flap valve 11 into the chamber 5. Thus, the holding portion opening 4a can be opened in the same manner as described above.

A seal receiving portion 14 is provided at the proximal end of the holding portion 4 as shown in FIG. A seal member 6, which will be described later, for keeping the chamber 5 in the holding section 4 airtight is fitted inside the seal receiving section 14. The seal member 6 is sandwiched between a seal receiving portion 14 and a seal pressing member 15 as a frame member detachably attached to the seal receiving portion 14, so that the seal receiving portion 14 and the seal pressing member 15, that is, fixed to the holding unit 4.

At the proximal end of the seal holding member 15, when the seal holding member 15 is attached to the seal receiving portion 14, the holding member opening 16 is located on the same axis as the holding portion opening 4a of the holding portion 4. The treatment tool (not shown) can be pushed into the holding portion 4 through the holding member opening 16.

The seal member 6 is a membrane portion 17 which crosses perpendicularly to the axial direction of the trocar mantle tube 1, and the membrane portion 17 is integrally supported from the outer peripheral edge thereof along the axial direction of the trocar mantle tube 1. A cylindrical tube portion 18, a cylindrical device insertion portion 21, and a seal receiving portion 14, which are provided on the inner side of the tube portion 18 and continuous with the membrane portion 17 so as to be located on the same axis as the tube portion 18. And a fixing portion 19 sandwiched between the seal holding member 15 and the like. This seal member 6 is preferably formed of an elastic material such as silicon rubber or natural rubber.

As shown in FIGS. 2 to 4, the membrane portion 17 extends along the radial direction of the cylindrical portion 18 in the axial direction of the trocar mantle tube 1, that is, at the axially intermediate portion of the cylindrical portion 18.
It is provided integrally inside. At the same time, the seal member 6 is formed to be thinner than other portions, and can be easily elastically deformed.

As shown in FIGS. 2 to 4, the cylindrical portion 18
When a medical instrument such as an inner needle 9 or an optical viewing tube or a treatment tool is inserted into the inside of the trocar mantle tube 1, the medical instrument has a strength capable of supporting the medical instruments so as not to be tilted or shifted. Thus, it is formed thick. At the same time, when the medical devices are tilted or shifted inside the trocar mantle tube 1,
The medical device has an elastic force for urging the medical devices to be positioned on the same axis as the trocar mantle tube 1.

As shown in FIGS. 3 and 4, the instrument insertion portion 21 is provided at the radially central portion of the membrane portion 17 so as to extend from the membrane portion 17 toward the distal end side of the trocar mantle tube 1. I have. At the center of the instrument insertion section 21, an insertion section opening 20 is provided as an opening through which a medical instrument such as an optical viewing tube or a treatment tool used together with the trocar mantle tube 1 is inserted. When the sealing member 6 is sandwiched and fixed between the seal receiving portion 14 and the seal holding member 15, the insertion portion opening 20 is provided with the holding portion opening 4 a of the holding portion 4 and the holding member opening 16 of the seal holding member 15. At an intermediate portion between the holding portion opening 4a and the holding member opening 16 on the same axis. The distal end of the instrument insertion portion 21 has a flange 24
Are provided so as to integrally protrude outward in the radial direction of the instrument insertion portion 21 so as to face the membrane portion 17.

The fixing portion 19 is, as shown in FIGS.
It is formed from a flange having a cylindrical shape and a U shape in cross section. The fixing portion 19 has a distal end portion in close contact with the proximal end surface of the seal receiving portion 14, and an outer peripheral portion thereof engages with a distal outer peripheral edge portion of the seal holding member 15. Thereby, the seal member 6 is fixed to the near side in the holding section 4. At the same time, the fixing portion 19 is
The airtightness of the chamber 5 in the holder 4 is maintained by sealing the gap between the seal holder 4 and the seal holding member 15.

As shown in FIG. 2 and FIG. 3, between the membrane portion 17 and the cylindrical portion 18 of the seal member 6 and the seal holding member 15, the cylindrical portion 18 of the seal member 6 is provided with a trocar outer tube. A space 23 having a sufficient size is provided so that the space 23 can be inclined with respect to one axial direction within a range in which the elastic deformation is possible.

Further, the seal member 6 of the present embodiment includes:
A seal ring 22 is attached as an opening reducing means for reducing the diameter of the insertion portion opening 20 by urging the device insertion portion 21 so as to tighten it radially inward. As shown in FIGS. 3 and 4, the seal ring 22 is formed in an O-shape and circular in cross section. Further, the seal ring 22 is preferably made of an elastic material such as rubber. Seal ring 22
2 is attached to the seal member 6 by being fitted between the membrane portion 17 and the flange portion 21 on the outer periphery of the instrument insertion portion 21 as shown in FIGS.

According to the trocar mantle tube 1 having the seal member 6 and the seal ring 22 having the above-described structures, the seal holding member opening 16 and the insertion portion opening 20 of the seal member 6 are inserted into the holding portion 4. A medical device such as an inner needle 9 or an optical viewing tube or a treatment tool (not shown) can be inserted. After these medical instruments are inserted into the conduit 2 through the chamber 5 in the holding section 4, the medical instruments are made to protrude from the distal end opening 3 a of the insertion section 3, and a predetermined treatment or the like is performed on the diseased part in the body cavity of the patient. Do. In such a case, even if the flap valve 11 is pushed open by the distal end of the medical device to allow the outside of the holding portion 4 to communicate with the chamber 5, the device insertion portion in which the medical device is inserted around the outer periphery of the medical device. The tightness of the opening edge 20a of the insertion portion opening 20 of 21 allows the chamber 5 in the holding portion 4 to be kept airtight.

The membrane portion 17 provided continuously to the instrument insertion portion 21 is formed thinner than other portions of the seal member 6. Accordingly, when the medical device is displaced or tilted from the axial direction of the trocar mantle tube 1 in the conduit 2, the chamber 5, and the holding member opening 16, the membrane portion 17 of the seal member 6 is easily formed. It can be elastically deformed. That is, the instrument insertion section 21 can easily move following the shift or inclination of the medical instrument. Therefore,
Since the close contact state between the outer periphery of the medical device and the opening edge 20a of the insertion portion opening 20 of the device insertion portion 21 can be easily maintained,
The airtightness in the holding section 4 can be easily held.

A space 23 having a predetermined size as described above is provided between the film portion 17 and the cylindrical portion 18 of the seal member 6 and the seal pressing member 15. Thereby, the membrane portion 17 and the cylindrical portion 18 of the seal member 6 are also easily arranged in the axial direction of the trocar outer tube 1 so that the instrument insertion portion 21 can be easily elastically deformed while maintaining the above-mentioned close contact state. Can lean. That is, the entire seal member 6 except for the fixing portion 19 can easily move following the shift or inclination of the medical device, so that the airtightness in the holding portion 4 can be easily held.

In particular, the smaller the outer diameter of the medical device, the greater the deviation and inclination, and the more easily a gap is formed between the outer periphery of the medical device and the insertion portion opening 20 of the seal member 6. Also in this case, as described above, the film portion 17 is formed to be thin, and the space 2 is formed around the film portion 17 and the cylindrical portion 18.
3, the film portion 17 follows the movement of the medical device.
And the cylinder part 18 can be easily elastically deformed. This allows
Regardless of the arrangement of the medical device inside the trocar mantle tube 1, the close contact between the outer periphery of the medical device and the opening edge 20a of the insertion portion opening 20 can be easily maintained. Therefore, the airtightness in the holding section 4 can be easily held.

Further, a seal ring 22 is attached to the outer periphery of the instrument insertion section 21 to tighten the instrument insertion section 21 radially inward. Thereby, for example, the instrument insertion portion 21
Even when the outer diameter of the medical device inserted into the insertion portion opening 20 is smaller than the inner diameter of the insertion portion opening 20, the outer periphery of the medical device and the opening edge portion 20a of the insertion portion opening 20 are in close contact with each other. The caliber is reduced. At the same time, even when the medical device moves inside the trocar mantle tube 1 by shifting or tilting, the sealing is performed so that the outer periphery of the medical device and the opening edge 20a of the insertion portion opening 20 are in close contact. Ring 2
2, the instrument insertion portion 21 is tightened. Therefore, regardless of the size of the outer diameter of the medical device used with the trocar mantle tube 1 and the movement and arrangement of the medical device inside the trocar mantle tube 1, the airtightness in the holding portion 4 can be easily maintained.

The inner needle 9 used together with the trocar outer tube 1 of the present embodiment has a high-frequency vibration generating means therein. By operating the high-frequency vibration generating means, the blade portion can be moved at a high speed. Others can incise, puncture, or penetrate a body wall or the like by vibrating. According to the trocar mantle tube 1 of the present embodiment having the above-described configuration,
Even when the inner needle 9 having such high-frequency vibration generating means is in operation, the seal member 6 is in close contact with the outer periphery of the needle portion of the inner needle 9, so that the trocar mantle tube 1 is pierced through a body wall or the like. Also, the airtightness in the holding section 4 can be maintained. Therefore, the inner needle 9 having the high-frequency vibration generating means can be used for the trocar mantle tube 1 of the present embodiment, and the above-mentioned problem can be solved in this case.

Further, the seal member 6 and the opening reducing means 22 attached to the seal member 6 may have, for example, the following configuration.

First, as shown in FIG. 5A, instead of the seal ring 22 as the aperture reducing means, a coil spring 22a formed in a ring shape using a coiled wire, or FIG. As shown in (b), a band woven in a mesh shape using an elastic material, for example, an elastic wire, or a band spring 22b formed in a ring shape using a blade may be used.
The coil spring 22a, the band spring 22b, and the like can more easily increase the tightening force and the durability than the seal ring 22. Accordingly, when the coil spring 22a or the band spring 22b is used instead of the seal ring 22, even if the seal member 6 is repeatedly used, the urging force for reducing the diameter of the insertion portion opening 20a of the instrument insertion portion 21 is reduced. , And can be maintained for a longer period without deterioration. Therefore, even with such a configuration, the above-mentioned problem can be solved, and the life of the seal member 6 and the trocar outer tube 1 can be extended.

Second, as shown in FIG. 6, the instrument insertion portion 21 is formed into a hollow frustum-shaped sleeve 25.
It does not matter. At the same time, a spiral spring 22c may be embedded in the sleeve 25 so as to surround the insertion portion opening 20 in the axial direction and the radial direction. By incorporating the spring 22c in the seal member 6, the spring 2
Since 2c is not exposed, the deterioration of the spring 22c due to repeated use of the seal member 6 can be suppressed. Therefore, the life of the seal member 6 and thus the trocar mantle tube 1 can be extended. Spring 2
The medical device does not get caught on 2c, blood or body fluid coming out of the patient's body cavity adheres to the spring 22c, and does not accumulate on the outer periphery of the sleeve 25. Therefore,
Such a configuration can of course solve the above-mentioned problem, and at the same time, can improve the operability and safety of the seal member 6, and thus the trocar mantle tube 1, and
It is more preferable in terms of hygiene, for example, that the sealing member 6 and the trocar mantle tube 1 are more easily cleaned and disinfected, and are more easily kept clean.

Third, as shown in FIG. 7 (a), the instrument insertion section 21 may be integrated with the membrane section 17, and a leaf spring 22d as an opening reducing means may be built therein. As the film part 17 moves from its outer periphery toward the center,
Along the axial direction of the trocar mantle tube 1, the trocar is formed in a tapered surface shape that is inclined from the hand side to the tip side.

Thus, the proximal side of the seal member 6 is formed in a funnel shape. A member (not shown) having a low coefficient of friction, for example, a cloth woven and woven with nylon fibers, polyurethane fibers, or the like, is integrally attached to the proximal end face of the film portion 17 formed in the tapered surface shape. . The leaf spring 22d built in the film portion 17 also
It is formed in a tapered shape along the outer shape of the film portion 17.

As shown in FIGS. 7B and 7C, the leaf spring 22d has an annular leaf spring ring portion 26 and a plurality of leaf spring finger members 27 provided continuously inside the ring portion. It is composed of Each of the leaf spring finger members 27 is formed in a substantially fan shape whose width is gradually reduced from the outer periphery of the leaf spring 22d toward the center.
It is provided intermittently along the circumferential direction of the leaf spring ring portion 26. Further, each leaf spring finger member 27 is arranged such that the distal end of the leaf spring finger member 27 surrounds the periphery of the insertion portion opening 20 in a ring shape inside the membrane portion 17 and is located concentrically with the insertion portion opening 20. , Each having the same length.

As described above, the above problem can be solved by using the sealing member 6 in which the membrane portion 17 is formed in a funnel shape and the leaf spring 22d built in the membrane portion 17. The same effect can be obtained as when the seal member 6 having the above-described sleeve 25 and the spring 22c built in the sleeve 25 are used.

Further, the film portion 17 is formed in the shape of a funnel inclined as described above, and a cloth having a low coefficient of friction is integrally attached to the proximal end face thereof. Thereby, when inserting the inner needle 9 or a medical instrument such as an optical sight tube or a treatment instrument into the trocar mantle tube 1, the tip of the medical instrument is pressed against the proximal end face of the membrane portion 17. The leading end can be guided along the shape of the membrane portion 17 and smoothly on the cloth to the insertion portion opening 20 provided at the center of the membrane portion 17.
Therefore, the medical instrument can be smoothly inserted into the inside of the trocar mantle tube 1.

Since the leaf spring 22d is composed of the leaf spring ring 26 and the plurality of leaf spring finger members 27, the leaf spring 22d can be easily elastically deformed along its radial direction. Can be. Therefore, the insertion portion opening 20
The ease with which the medical instrument can be inserted into and removed from the medical instrument can be improved. Further, when inserting a medical instrument into the inside of the trocar mantle tube 1, it is not necessary to find the insertion portion opening 20 with the tip of the medical instrument, so that the trocar mantle tube 1 including the medical instrument and the seal member 6 is not prepared. Very low risk of damage.

FIG. 7D shows a modification of the sealing member 6 in which the membrane portion 17 is formed in a funnel shape and a leaf spring 22d built in the membrane portion 17 as described above. Alternatively, the film portion 17 and the aperture reducing means 22 may be integrally formed. The film part 17 and the aperture reducing means 22 are integrally formed by a plurality of diaphragm blades 22 e made of a resilient material having spring properties, and these are formed into a cylindrical part 18.
Attach it inside so that it can move like a diaphragm of a camera.

That is, the plurality of aperture blades 22e are
It has a configuration like a throttle-shaped spring spring that can move in the circumferential direction and the radial direction of the cylindrical portion 18. Accordingly, even when medical instruments having various outer diameters are inserted into the insertion portion opening 20, the insertion portion opening 20 is positioned along the direction indicated by the solid arrow in FIG. The diameter of the device can be easily changed according to the size of the outer diameter of the device. At the same time, a plurality of aperture blades 22
e are urged radially inward of the cylindrical portion 18 by their own spring properties. Therefore, the opening edge portion 20a of the insertion portion opening 20 can maintain the close contact state with the outer periphery of the medical device regardless of the outer diameter of the medical device and the arrangement state.

Fourth, a first spring member 22f made of a material having a spring property as shown in FIGS. 8 and 9 may be used instead of the seal ring 22 as the aperture reducing means. . As shown in FIG. 8B, the first spring member 22f has a leg 2 extending at one end thereof in a direction perpendicular to the axial direction when viewed in plan along the axial direction.
8a is extended at the other end in a direction perpendicular to the axial direction, and is shorter than the leg 28a.
Are further arranged, and further, an arm 28c is arranged so that one end and the other end thereof are crossed and connected.

The first spring member 22f is provided as shown in FIG.
As shown in the figure, when viewed from the front along the axial direction, a pair of legs 28a is provided at both ends, and a pair of action portions 28b is provided at the center in a direction substantially orthogonal to the pair of legs 28a. Are respectively arranged, and the pair of legs 28a and 1
As connected to the pair of action parts 28b to form three rings,
Two pairs of arms 28c are arranged.

As shown in FIGS. 8A and 9, the first spring member 22f has a pair of action portions 28b formed on the outer periphery of the instrument insertion portion 21 of the seal member 6 by the film portion 17a.
And the flange portion 24. The pair of action portions 28b urges the instrument insertion portion 21 to be tightened radially inward by the above-described structure and the resiliency of the first spring member 22f. At the same time, the pair of legs 28 a of the first spring member 22 f is sandwiched between the proximal end surface of the seal receiving portion 14 and the distal end portion of the seal member 6.

As described above, the first spring member 22f is fixed to the inside of the seal member 6 and the holding portion 4. Of course, the above-mentioned problem can also be solved by mounting the first spring member 22f having the structure described above in the holding portion 4 as described above.

The action portion 28b of the first spring member 22f
And the leg 28a are connected by the arm 28c formed longer than the first spring member 22f.
The length of the elastically deformable portion can be increased. Thereby, the movable range of the action portion 28b with respect to the leg 28a fixed to the holding portion 4 can be made extremely wide.

Therefore, for example, when a medical instrument having an outer diameter larger than the inner diameter of the insertion section opening 20 is inserted into the instrument insertion section 21, the action section 28b for tightening the instrument insertion section 21 and, consequently, the leg section 28a. First spring member 22 except for
f can be largely elastically deformed. Thereby, the force for pushing a medical device having an outer diameter larger than the inner diameter of the insertion portion opening 20 into the device insertion portion 21 and the force for pulling out the medical device from the device insertion portion 21 can be significantly reduced. Therefore, even when the outer diameter of the medical device is large, the ease with which the medical device can be inserted into and removed from the device insertion portion 21 can be significantly improved. At the same time, portions other than the fixing portion 19 of the sealing member 22f,
And the portion other than the leg 28a of the first spring member 22f,
As shown in FIG. 9, large elastic deformation can be performed in the holding portion 4. This makes it possible to significantly improve the followability of the device insertion portion 21 with respect to movements such as displacement and inclination of the medical device in the holding portion 4. Therefore, regardless of the size of the medical device and its arrangement, the trocar mantle tube 1
The airtightness inside can be kept extremely well.

As a modification of the first spring member 22f described above, a second spring member 22g as shown in FIG.
May be used. The second spring member 22g is connected to the first spring member 22g.
The arm member 28c is removed from the spring member 22f. The seal member 6 to which the second spring member 22g is attached is, as shown in FIG.
And the fixing part 19 is omitted. Further, from the outer periphery on the distal end side of the sealing member 6, the second flange portion 24a
Are provided so as to integrally project toward the radial inside of the seal member 6 so as to face the film portion 17. The second spring member 22g is held inside the seal member 6 by being fitted into a space formed by the film portion 17, the flange portion 24, and the second flange portion 24a.

The seal member 6 is fixed in the holding section 4 by being fitted into an annular groove 29 provided inside the seal holding member 15. The sealing member 6 and the second spring member 22g having such a configuration
According to this, for example, as shown by a solid line arrow in FIG. 10B, even if the insertion portion opening 20 is displaced in the radial direction from the center position of the film portion 17, it can be easily returned to the original position.

The second spring member 22g having the structure as described above is replaced with the sealing member 6 as described above.
It is needless to say that the above-mentioned problem can be solved by attaching to the device. At the same time, the thickness of the second spring member 22g and the seal member 6 along the axial direction can be extremely small, so that the holding portion 4 can be made compact.

<Second Embodiment> Next, a trocar mantle tube 101 according to a second embodiment of the present invention will be described with reference to FIGS.

The trocar mantle tube 10 of the second embodiment
1 is that only the shape and configuration of the seal member 102 and the aperture reducing means 103 are different from the shape and configuration of the seal member 6 and the aperture reducing means 22 of the first embodiment, and other configurations, operations, and effects are different. Almost the same. Therefore, only the different parts will be described, and all other descriptions will be omitted. Also, with respect to the drawings, the drawings of the same components including the side view of the trocar mantle tube 101 are omitted, and the drawings allow the features of the seal member 102 and the opening reducing means 103 of the present embodiment to be well understood. FIG. 11 to FIG.
In FIG. 18, the same portions as those in the first embodiment are denoted by the same reference numerals.

The seal member 102 of this embodiment is similar to the seal member 102 shown in FIG.
As shown in (2), it is fixed to the holding portion 4 by being fitted into an annular groove 29 provided in the seal receiving portion 14. The seal member 102 has an outer skin formed by a thin film portion 102a, and has a ring shape and a hollow bag shape. This ring-shaped seal member 102
Is provided with an insertion portion opening 2
0 is formed at the opening edge 20a.

The cross section of the seal member 102 in the radial direction is such that the portion fitted into the annular groove 29 is formed in a substantially square shape along the annular groove 29 and the annular groove 29 is formed. The portion protruding from the annular groove 29 is formed in a substantially triangular shape such that the width gradually decreases from both ends in the width direction of the annular groove 29 toward the opening edge 20a.

It is preferable that the film portion 102a is made of a material having elasticity and elasticity. For example,
It is preferably made of latex rubber, silicone rubber, natural rubber, or the like. At the same time, membrane part 1
It is preferable to apply a lubricant to the outer surface of the portion protruding from the annular groove 29 of 02a. Thus, when the medical device is inserted into the insertion portion opening 20, the frictional resistance between the outer periphery of the medical device and the opening edge 20a of the seal member 102 can be reduced. Therefore, the insertion / removal of the medical device into / from the insertion portion opening 20 and the insertion / removal of the medical device into / from the trocar mantle tube 101 can be improved.

A sealing member 102 formed in a bag shape
Inside has no specific shape by itself.
A filler 104 that can be freely deformed or moved is filled. As the filler 104, for example, water or silicon oil is preferable if it is a liquid. If a gas, air or the like is preferable. Further, a gel-like substance may be used.

As described above, the sealing member 102 has the film portion 102a formed of the material having elasticity and elasticity, and the film portion 102a forms the outer skin of the sealing member 102 formed in a capsule shape. Further, a filler 104 is filled in the inside of the seal member 102. With the above-described configuration of the seal member 102, when a medical instrument is inserted into the insertion portion opening 20, the opening edge 20a of the seal member 102 is elastically deformed, so that the insertion portion opening 20 Depending on the size of the outer diameter of the device, it is pushed radially outward.

Then, pressure is applied to the seal member 102, but the outer peripheral portion of the seal member 102 is held down in a predetermined shape by the annular groove 29. Is the filler 104
Is filled. Thereby, compared with the case where the medical device is not inserted through the insertion portion opening 20, the insertion portion opening 20
When a medical device is inserted into the seal member 102, a higher internal pressure is generated inside the seal member 102. Due to this internal pressure, the opening edge portion 20a is pushed back while being elastically deformed inward in the radial direction of the insertion portion opening 20 so as to tighten the outer periphery of the medical device from the outside. Therefore, the sealing member 10
2, when the medical device is inserted through the insertion portion opening 20, the entire sealing member 102 urges the opening edge portion 20a so as to reduce the insertion portion opening 20 inward in the radial direction. This is equivalent to having spring properties.

That is, the sealing member 102 composed of the elastically deformable film portion 102 and the filler 104 is
By fitting into the annular groove 29 in the holding portion 4, it becomes equivalent to having the opening reducing means 103 in the seal member 102 itself. In other words, the seal member 1 of the present embodiment
02 denotes an opening reducing means 103 and an integral type sealing member 102.
It is.

Therefore, the sealing member 1 as described above
According to 02, regardless of the size of the outer diameter of the medical device, the outer periphery of the medical device and the opening edge 20a of the insertion portion opening 20 are
It is possible to more reliably and easily adhere to each other. Also, the film portion 10 including the opening edge portion 20a
Since 2a has elasticity, the close contact state between the outer periphery of the medical device and the opening edge 20a of the insertion portion opening 20 can be more reliably and more easily held regardless of the outer shape of the medical device. .

Further, even if the medical device or the like is displaced or tilted inside the trocar mantle tube 101, the portion protruding from the annular groove 29 of the membrane portion 102a follows the movement thereof, and Elastically deform so as to maintain the close contact state between the opening portion 20 and the opening edge 20a of the insertion portion opening 20. Therefore, according to the seal member 102 of the present embodiment having the above-described configuration, regardless of the size of the medical device, its external shape, and its arrangement, the insertion portion opening 20 of the seal member 102 has: The airtightness in the holding section 4 can be held more reliably and more easily.

The trocar mantle tube 10 of the second embodiment
1 is the same as the trocar mantle tube 1 of the first embodiment except for the points described above. Therefore, the problem of the present invention can be solved by using the trocar mantle tube 101 of the second embodiment. Needless to say, the sealing member 102 and the opening reducing means 103 having the above-described shape and configuration are used.
The second embodiment provided with is excellent in the following points.

The seal member 102 of the present embodiment has a structure provided with the aperture reducing means 103 itself. Thereby, the sealing member 102 itself as the sealing means can be made compact. Consequently, the holding section 4 can be made compact.

Further, the seal member 102 integrally provided with the aperture reducing means 103 may have the following configuration, for example.

First, as shown in FIG. 12, the seal member 102 is formed in a single ring shape from an elastically deformable and stretchable material. Further, the seal member 102 is formed such that its outer diameter is smaller than the inner diameter of the annular groove 29. The portion of the seal member 102 protruding from the annular groove 29 is, as viewed in cross section, from the outer peripheral side toward the opening edge 20a.
It is formed in a mountain shape such that the thickness gradually decreases.

The portion of the seal member 102 fitted into the annular groove 29 is formed such that its sectional view is stepped. In this way, the step is provided with the sliding protrusion 1.
By forming 05, the portion of the seal member 102 fitted into the annular groove 29 can easily slide in the radial direction with the annular groove 29 while maintaining airtightness or watertightness. Further, the sealing member 102 and the annular groove 2
9 is filled with a filler 1 such as water or silicone oil for a liquid, or air for a gas, or a gel-like substance.
04 is filled and sealed.

According to the above-described structure, the sealing member 102, the filler 104, and the annular groove 29 are combined to form an opening reducing means 103 integrated sealing means. Therefore, not only can this problem be solved by such a configuration, but also by forming the seal member 102 densely with only a material having elasticity and elasticity, wear resistance and resistance to wear can be improved. Elastic fatigue and the like can be increased. Therefore, the durability of the seal member 102 can be increased, and the life of the seal member 102 can be extended. Also, since the portion of the seal member 102 protruding from the annular groove 29 is formed in a mountain shape,
The followability of the opening edge portion 20a to the movement of the medical device can be further improved.

Second, as shown in FIG. 13, the seal member 102 may be formed in a ring shape having a substantially square cross section. According to such a configuration, not only can the above-mentioned problem be solved, but also the area of the portion where the outer periphery of the medical device is in close contact with the opening edge portion 20a can be made larger, so that this insertion is possible. In the opening 20, the airtightness in the holding section 4 can be more reliably and easily held.

Third, as shown in FIG. 14, the seal member 102 may be formed in a ring shape having a substantially triangular cross section. According to such a configuration, not only the above problem can be solved, but also the area of the portion where the outer periphery of the medical device is in close contact with the opening edge portion 20a can be minimized. Equipment and opening edge 2
0a can be reduced. That is, the force for pushing the medical device into the insertion portion opening 20 and the insertion portion opening 2
The force for pulling out the medical device from zero can be reduced. Therefore, the insertion / removal of the medical device into / from the seal member 102 and the trocar mantle tube 101 can be improved.

Fourth, as shown in FIG. 15, the seal member 102 has a substantially square ring shape in cross section, and the opening edge 20a is made thinner than the other parts of the seal member 102. It may be formed. According to such a configuration, not only the above problem can be solved, but also the opening edge portion 20a can be easily elastically deformed. Therefore, the opening edge portion 20a can be more easily and more securely adhered to the outer periphery of the medical device. That is, in the insertion portion opening 20, the airtightness in the holding portion 4 can be held more reliably and more easily.

Fifth, as shown in FIG. 16, the seal member 102 has an annular groove formed by being sandwiched between the seal pressing member 15 and the seal receiving portion 14 so as to have a thickness and an outer diameter. 29 are formed so as to be smaller than the thickness and the size of the inner diameter, respectively. At the same time, a fixing flange 106 having an outer diameter larger than the inner diameter of the annular groove 29 is formed so as to protrude integrally from an intermediate portion in the thickness direction of the outer periphery of the seal member 102. Seal member 102 having such a shape
The fixing flange 106 is attached to the seal holding member 1.
5 is fixed in the annular groove 29 by being sandwiched between the seal receiving portion 14 and the seal receiving portion 14. Then, the seal member 102 is fixed to the holding portion 4 only by the ring-shaped portion sandwiched between the seal pressing member 15 and the seal receiving portion 14 of the fixing flange 106 provided on the outer periphery thereof. become. In addition, a free space 107 is provided between the outer periphery of the seal member 102 and the inner wall of the annular groove 29 so that the seal member 102 can be elastically deformed along its axial direction and radial direction. According to such a configuration, not only the above problem can be solved, but also the opening edge 20a of the seal member 102 can easily follow the shift or inclination of the medical device. Therefore, regardless of the arrangement state of the medical device, the airtightness in the holding portion 4 is reduced by the insertion portion opening 2.
At 0, it can be more easily held.

Sixth, FIG.
As shown in FIG. 7, a filler injection port 108 which penetrates through the seal holding member 15 and protrudes to the outside and has an opening at an end thereof is provided. At the same time, a check valve 109 is provided at an intermediate portion where the opening and the seal member 102 disposed inside the seal pressing member 15 communicate with each other. The check valve 109 regulates the direction in which the filler 104 to be filled from the filler injection port 108 flows toward the inside of the holding portion 4 of the seal member 102 from the opening side. The opening can be opened and closed at any time using the cap 110. According to such a configuration, not only the above problem can be solved, but also the sealing member 102 can be used.
The internal pressure of the portion inside the check valve 109 can be set to an arbitrary value. That is, according to the outer diameter of the medical device inserted through the insertion portion opening 20, the sealing member 102
Can be arbitrarily changed.

Seventh, as shown in FIG. 12, the seal member 102 is formed in a dense, single ring shape from an elastically deformable and stretchable material. Further, the outer diameter of the seal member 102 is set to the annular groove 2.
9 is formed to be smaller than the size of the inner diameter. Further, the seal member 102 is formed so that its cross-sectional view is substantially square. Also, grooves are provided at both ends in the thickness direction on the inner peripheral side of the annular groove 29 into which the seal member 102 is fitted, and the seal member 102 is slidable along its radial direction, A pair of O-rings 111 are fitted so as to be able to move while maintaining the airtightness with the groove 29. Further, in the space between the seal member 102 and the annular groove 29, for example, if a liquid, water,
Alternatively, it is filled with a sealing material 104 such as silicon oil or, for example, air if it is a gas, or a gel-like substance, and sealed. According to such a configuration, not only can the above-mentioned problem be solved, but also, since the sealing member 102 is made densely of only a material having elasticity and elasticity, wear resistance and elasticity can be reduced. It can increase fatigue and the like. Therefore, the durability of the seal member 102 can be increased, and the seal member 1
02 can be extended. Also, sealing member 1
Since the section 02 is formed so as to have a substantially quadrangular cross-sectional view, the area of the portion in close contact with the outer periphery of the medical device and the opening edge 20a can be made larger. Therefore,
In the insertion portion opening 20, the airtightness in the holding portion 4 can be held more reliably and more easily.

Third Embodiment Next, a trocar mantle tube 201 according to a third embodiment of the present invention will be described with reference to FIGS.

The trocar mantle tube 20 of the third embodiment
1 is that only the shape and configuration of the seal member 202 and the opening reducing means 203 are different from the shape and configuration of the seal means 6 of the first embodiment described above,
The action and effect are almost the same. Therefore, only the different parts will be described, and all other descriptions will be omitted. Also, with respect to the drawings, the drawings of the same components including the side view of the trocar mantle tube 1 are omitted, and the features of the seal member 202 and the opening reducing means 203 of the present embodiment can be well understood. FIG. 19 and FIG.
The same parts as those of the embodiment are denoted by the same reference numerals.

The seal member 202 of this embodiment is similar to the seal member 202 shown in FIG.
As shown in (a), it is formed densely of an elastically deformable material so that a sectional view along the axial direction thereof has a mortar shape. Also, the sealing member 20
A tapered surface 204 is formed inside the seal receiving portion 14 in which the inner surface 2 is fitted so that the inner diameter thereof gradually decreases from the proximal side to the distal side. Further, together with the seal receiving portion 14, the sealing member 202 is sandwiched from both sides in the axial direction to hold the sealing member 4.
The seal holding member 15 fixed to the
And a screw engagement. Accordingly, the depth of engagement of the seal pressing member 15 with the seal receiving portion 14 can be arbitrarily adjusted along the axial direction of the trocar mantle tube 201.

According to the above-described structure, when the seal holding member 15 is screwed with respect to the seal receiving portion 14 to deepen the mutual engagement, the seal member 202 sandwiched between them is formed. The tip is compressed along the axial direction. Then, the seal member 202 moves to the distal end side along the axial direction of the trocar mantle tube 201. At the same time, the tip end portion of the seal member 202 is guided by the tapered surface 204 and is urged radially inward of the seal receiving portion 14. Thereby, the sealing member 202
Is elastically deformed so as to be pushed inward in the radial direction. That is, the diameter D1 of the insertion portion opening 20 is reduced. Further, when the seal holding member 15 is screwed in the opposite direction to the seal receiving portion 14 in the opposite direction to make the engagement thereof shallow, the seal member 202 sandwiched between them becomes the seal holding member 15. And the seal receiving portion 14 is released from compression. Then, the seal member 202 moves toward the hand side along the axial direction of the trocar mantle tube 201. At the same time, the distal end portion of the seal member 202 is guided by the tapered surface 204 and moves radially outward of the seal receiving portion 14. Thereby, the opening edge 20a of the sealing member 202
Are elastically deformed so as to spread radially outward. That is, the diameter D1 of the insertion portion opening 20 is enlarged.

As described above, the seal holding member 1
5 and the seal receiving portion 14 positively and arbitrarily increase the size of the diameter D1 of the insertion portion opening 20 according to the depth of engagement of the seal pressing member 15 with the seal receiving portion 14, arbitrarily. Further, the aperture reducing means 203 which can be easily changed is constituted.

Further, as shown in FIG. 19B, it is preferable that the seal pressing member 15 and the seal receiving portion 14 have the following structures.

A reference scale 205 serving as a reference for measuring the depth of engagement of the seal holding member 15 with the seal receiving portion 14 is provided on the outer peripheral surface of the seal receiving portion 14. At the same time, a plurality of scales 206 to be measured indicating the depth of engagement of the seal holding member 15 with the reference scale 205 are provided on the outer peripheral side surface of the seal holding member 15. Further, for each of the measured scales 206, the size of the diameter D1 of the insertion portion opening 20 corresponding to the engagement depth between the seal holding member 15 and the seal receiving portion 14 is set to an actually measured value. Notation based on numbers.

The trocar outer tube 20 of the third embodiment
1 is the same as the trocar mantle tube 1 of the first embodiment except for the points described above. Therefore, the problem of the present invention can be solved by using the trocar mantle tube 201 of the third embodiment. Needless to say, the sealing member 202 and the opening reducing means 203 having the above-described shape and configuration are used.
The third embodiment provided with is excellent in the following points.

According to the trocar mantle tube 201 of the present embodiment, a doctor or the like operating the trocar mantle tube 201 operates the opening reducing means 203 to match the outer diameter of the medical instrument to be used. The diameter D1 of the insertion portion opening 20 can be reduced or enlarged. That is, a doctor or the like operating the trocar mantle tube 201 confirms with his / her own eyes, and
The diameter D1 of 0 can be positively and easily changed. Therefore, regardless of the size of the medical device, its external shape, and its arrangement, this sealing member 2
02, the airtightness inside the holding portion 4 is
It can be held more reliably and more easily.

Further, the seal member 202 and the aperture reducing means 203 may have the following configuration, for example.

FIG. 2 shows a portion of the seal member 202 on the distal end side in FIG.
As shown in FIG. 0, the thickness is gradually reduced from the outer side and the inner side in the radial direction toward the distal side along the axial direction. At the same time, the inner side end face of the seal receiving portion 14 constituting the opening reducing means 203 is formed as a plane perpendicular to the axial direction. Thereby, the tip portion of the seal member 202 can move on the proximal end surface of the seal receiving portion 14 along the radial direction of the seal receiving portion 14. According to such a configuration, not only can the above-mentioned problem be solved, but also as in the case described above, the insertion portion opening 2 can be changed according to the depth of engagement of the seal pressing member 15 with the seal receiving portion 14.
The size of the diameter D2 of 0 can be positively, arbitrarily, and easily changed.

The trocar mantle tubes 1 and 10 of the present invention
1, 201 are not restricted to the first to third embodiments. According to the description of each of the above embodiments, for example, as shown below, a configuration such as each supplementary note or an arbitrary combination of these supplementary notes may be adopted.

<Supplementary Notes> Supplementary Notes 1. A trocar mantle tube for assembling an inner needle and penetrating into a body cavity to guide a medical instrument such as an optical sight tube or a treatment tool into the body cavity, an elongated insertion portion having a channel inside, and an insertion portion A holding part provided on the base end side of the holding part, and an elastically deformable sealing means for keeping the chamber in the holding part airtight. The sealing means comprises an opening through which the medical instrument is inserted, An opening reducing means for urging the diameter of the trocar to be reduced.

Appendix 2. The trocar mantle tube according to claim 1, wherein the opening reducing means is a ring fixed to an outer peripheral portion of the opening to urge the opening radially inward and having elasticity.

Appendix 3 2. The trocar outer tube according to claim 1, wherein the opening reducing means is a spring fixed to an outer peripheral portion of the opening, biasing the opening radially inward, and having elasticity.

Appendix 4 The opening reduction means is embedded inside the sealing means, and when the opening is pushed radially outward, the opening is elastically deformed to reduce the diameter of the opening. 2. The trocar mantle tube according to claim 1, wherein the trocar is provided with an elastic member for urging the trocar radially inward.

[0092]

According to the trocar mantle according to the first aspect of the present invention, the diameter of the opening of the elastically deformable sealing means through which a medical instrument such as an optical viewing tube or a treatment tool is inserted is reduced. An opening reducing means for urging is provided. As a result, even if a medical instrument such as a small-diameter optical sight tube or a treatment tool is inserted into the inside of the trocar mantle tube, and they are displaced or tilted during the operation, the opening is made to follow the movement, and And the outer periphery of the medical device can be kept in close contact with each other. Therefore, airtightness inside the trocar outer tube can be maintained irrespective of the size and the arrangement state of the medical instrument inserted through the inside of the trocar outer tube.

[Brief description of the drawings]

FIG. 1 is a side view showing a trocar mantle tube according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing the trocar mantle tube shown in FIG. 1;

FIG. 3 is a sectional view showing the vicinity of a holding portion of the trocar mantle tube shown in FIG. 1;

4A is a sectional view showing a seal member and a seal ring of the trocar mantle tube shown in FIG. 1. FIG. FIG. 2B is a perspective view showing a seal ring of the trocar mantle tube shown in FIG. 1.

FIG. 5A is a perspective view showing a coil spring as a modification of the seal ring of the trocar mantle tube shown in FIG. 1; FIG. 2B is a perspective view showing a band or a plate as a modified example of the seal ring included in the trocar mantle tube shown in FIG. 1.

6A is a cross-sectional view showing a modified example of the seal member and the seal ring of the trocar mantle tube shown in FIG. 1. FIG. (B) is a perspective view showing a spring as a modification of the seal ring shown in Drawing 4 (b).

FIG. 7A is a cross-sectional view showing the vicinity of a holding portion of a trocar mantle tube having a modified example of the seal member and the seal ring shown in FIGS. 4A and 4B. (B)
FIG. 5 is a perspective view showing a leaf spring as a modified example of the seal ring shown in FIG. 4. FIG. 7C is a cross-sectional view illustrating the seal member and the leaf spring illustrated in FIG. 7A along an intermediate portion in the thickness direction of the leaf spring. FIG. 7D shows FIGS.
Sectional drawing which shows the diaphragm blade-type seal member as a modification of the seal member and leaf spring shown to (c).

8A is a side view showing the vicinity of a holding portion of a trocar mantle tube using a modification of the sealing means of the trocar mantle tube shown in FIG. 3; FIG. FIG. 9B is a side view showing the spring member attached to the seal member of the trocar mantle tube shown in FIG. FIG. 9C is a front view showing a spring member attached to the seal member of the trocar mantle tube shown in FIG. 8A.

FIG. 9 is a cross-sectional view showing a state in which the sealing means of the trocar mantle tube shown in FIG. 8A is elastically deformed.

FIG. 10A is a cross-sectional view showing the vicinity of a holding portion of a trocar mantle tube using a modification of the sealing means of the trocar mantle tube shown in FIG. 8A. FIG.
Sectional drawing which shows the state which the sealing means shown to 0 (a) elastically deformed along the XX line in FIG. 10 (a).

FIG. 11 is a sectional view showing the vicinity of a holding portion of a trocar mantle tube according to a second embodiment of the present invention.

12 is a cross-sectional view showing the vicinity of a holding portion of a trocar mantle tube using a modified example of the sealing means of the trocar mantle tube shown in FIG.

FIG. 13 is a sectional view showing the vicinity of a holding portion of a trocar mantle tube using a modified example of the sealing means of the trocar mantle tube shown in FIG. 11;

FIG. 14 is a sectional view showing the vicinity of a holding portion of a trocar mantle tube using a modified example of the sealing means of the trocar mantle tube shown in FIG. 11;

FIG. 15 is a sectional view showing the vicinity of a holding portion of a trocar mantle tube using a modified example of the sealing means of the trocar mantle tube shown in FIG. 11;

FIG. 16 is a sectional view showing the vicinity of a holding portion of a trocar mantle tube using a modified example of the sealing means of the trocar mantle tube shown in FIG. 11;

FIG. 17 is a sectional view showing the vicinity of a holding portion of a trocar mantle tube using a modified example of the sealing means of the trocar mantle tube shown in FIG. 11;

FIG. 18 is a sectional view showing the vicinity of a holding portion of a trocar mantle tube using a modified example of the sealing means of the trocar mantle tube shown in FIG. 11;

FIG. 19A is a cross-sectional view showing the vicinity of a holding portion of a trocar mantle tube according to a third embodiment of the present invention. (B)
FIG. 20 is a perspective view showing a part of the proximal end of the holding unit shown in FIG.

20 is a sectional view showing the vicinity of a holding portion of a trocar mantle tube using a modified example of the sealing means of the trocar mantle tube shown in FIG. 19;

[Explanation of symbols]

Reference numerals 1, 101, 201: trocar outer tube 2: pipe 3, insertion part 4, holding part 5, chamber 6, 102, 103, 202 sealing member (seal means) 9, inner needle 14, 203: seal receiving part ( 15, 203: Seal holding member (opening reducing unit) 22: Seal ring (opening reducing unit) 22a: Coil spring (opening reducing unit) 22b: Band spring (opening reducing unit) 22c: Spring (opening reducing unit) 22d: leaf spring (opening reducing means) 22e ... aperture blade (opening reducing means) 22f ... first spring member (opening reducing means) 22g ... second spring member (opening reducing means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Inaba 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industrial Co., Ltd. (72) Inventor Ryoji Masuchi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Mitsumasa Okada 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olimpus Optical Industries Co., Ltd. (72) Inventor Tsutomu Okada 2-43-2, Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Takeaki Nakamura 2-43-2 Hatagaya, Shibuya-ku, Tokyo F-term within Olympus Optical Co., Ltd. 4C060 AA10 4C061 AA00 BB00 CC00 DD00 GG27

Claims (1)

[Claims] 1. A trocar outer tube for assembling an inner needle and piercing into a body cavity to guide a medical instrument such as an optical sight tube or a treatment tool into the body cavity, wherein the insertion tube has a slender insertion portion having a channel therein. And a holding portion provided on the base end side of the insertion portion; and an elastically deformable sealing means for maintaining the airtightness of the chamber in the holding portion. A trocar mantle tube comprising: an opening; and an opening reducing means for urging the opening so as to reduce the diameter of the opening.