JPH0563501U - Mantle - Google Patents

Abstract

(57) [Abstract] [Purpose] Even with a relatively simple structure, even if various inserts having different diameters are selected and inserted, the airtightness at that time is sufficiently maintained and the operability is improved. An object is to provide a mantle tube that can be improved. An elastic membrane (6) is provided on the inner surface of an outer tube (2) forming an insertion passage (8) for an insert, the elastic membrane (6) being capable of contracting in the radial direction of the insertion passage (8), supplying and discharging a fluid to expand and contract the elastic membrane (6). An air chamber 7 is formed in which the inner diameter of the insertion passage 8 is variable.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an outer tube having an airtight holding structure.

[0002]

[Prior Art]

 When using a trocar, puncture the abdominal wall with the inner needle attached to the trocar. After that, only the inner needle is pulled out from the mantle tube, and the indwelling mantle tube is used as a guide to insert an endoscope and various treatment tools to inspect and treat the abdominal cavity. By the way, when the inside of the body is inspected or treated by the trocar, an inert gas such as carbon dioxide gas is supplied into the abdominal cavity to inflate the stomach to ensure a sufficient observation field of view and a treatment work area.

In order to maintain this pneumoperitoneum, a valve member is attached to the mantle tube, and this valve member is used for pneumoperitoneum through the gap between the mantle tube and the insert inserted therethrough. It has a structure that prevents inert gas from leaking out.

As described above, according to the conventional structure, the structure that prevents the inert gas from leaking through the gap between the outer tube and the insert has a structure such as an endoscope that can be used for the outside of the insert. The diameter was inevitably decided, and there was a drawback that it could not be used even if the diameter of the endoscope was thicker or thinner than that.

For example, if the opening area of the valve member is made small, when an insert having a relatively large diameter with respect to the opening area is inserted, the bending of the valve member becomes large and it becomes difficult to maintain airtightness. .. Further, the resistance when carrying out the withdrawal operation increases. On the contrary, if the opening area of the valve member is increased, it is not possible to sufficiently maintain the airtightness when inserting a small-diameter insert into the valve member.

On the other hand, the one disclosed in Japanese Utility Model Laid-Open No. 23501/1990 provides two valve members having different inner diameters so that the airtightness can be maintained even if an endoscope or a treatment instrument having a different diameter is inserted. Is becoming However, this still leaves many diameter inserts at the discretion of choice. Furthermore, even with inserts of the kind that can be used, it is not possible to maintain the same level of airtightness, and depending on the diameter, sufficient airtightness may not be maintained, which may interfere with inspections and the like.

[0007]

[Problems to be solved by the device]

 The present invention has been made by paying attention to the above-mentioned problems, and the purpose thereof is to have a comparatively simple structure, and even if various inserts having different diameters are selected and inserted, the airtightness at that time is obtained. The object is to provide a mantle tube which can be sufficiently maintained and whose operability can be improved.

[0008]

[Means and Actions for Solving the Problems]

 In order to solve the above-mentioned problems, the outer tube of the present invention forms an insertion passage for an insert on its inner surface, and is provided with an elastic membrane for sealing which is capable of contracting in the radial direction of the insertion passage. Then, the sealing elastic film was expanded and contracted to form a chamber for varying the inner diameter of the insertion passage. By injecting a fluid into the chamber, the elastic membrane for sealing is expanded or contracted according to the amount of the fluid to adjust the inner diameter of the insertion passage.

[0009]

【Example】

 FIG. 1 shows a trocar 1 to which a first embodiment of the present invention is applied. The trocar 1 is composed of an outer tube 2 and an inner needle 3. The outer tube 2 is composed of a tubular body 4 made of a thin metal pipe and a connecting pipe 5 brazed to the base end of the tubular body 4. On the inner surface of the cylindrical body 4, a sealing elastic film 6 made of an elastic material such as rubber is formed in a cylindrical shape.

The elastic film 6 is arranged in a range over the entire length of the cylindrical body 4, and the front end portion 6 a and the rear end portion 6 b of the elastic film 6 are adhered to the inner peripheral surface of the cylindrical body 4 over the entire circumference. ing. That is, the elastic film 6 is airtightly attached to the inner peripheral surface of the cylindrical body 4 at the front end portion 6a and the rear end portion 6b thereof, and the intermediate portion 6c of the elastic film 6 is disposed between the inner peripheral surface of the cylindrical body 4. To form an air chamber 7 that is closed by. A fluid such as air is supplied to and discharged from the air chamber.

The lengths A and B of the front end portion 6a and the rear end portion 6b of the elastic film 6 may be, for example, about 5 mm, but they are completely bonded so that air does not leak from this. The middle portion 6c of the elastic film 6 is made sufficiently longer than the lengths A and B. Then, an insertion passage 8 through which the inner needle 3 is inserted is formed by the inner hole of the expanding and contracting tubular elastic film 6.

A communication pipe 9 communicating with the air chamber 7 is attached to a portion of the cylindrical body 4 near the rear end portion 6b of the elastic film 6. A syringe and a gas supply / discharge tube (not shown) are connected to the communication pipe 9. Further, a cock 10 that opens and shuts off the passage is provided in the middle of the communication pipe 9. On the other hand, the inner needle 3 is formed by forming a sharp needle tip portion 12 by tapering the tip of the shaft body 11, and a large-diameter head body 13 is attached to the rear end of the shaft body 11.

When the trocar 1 is used to puncture a living body, the trocar 1 is used in the state shown in FIG. 1 in which the inner needle 3 is inserted and attached to the outer tube 2. In this case, since the inner needle 3 is usually selected to fit the outer tube 2, the elastic film 6 is brought into close contact with the inner surface of the tubular body 4 without introducing air into the air chamber 7 to inflate it. It can be used in the condition where it is turned on.

However, the cock 10 is opened, air is sent into the air chamber 7 through a syringe connected to the communication pipe 9 or a gas supply / exhaust tube to form an air layer, whereby the elastic film 6 swells and its insertion passage The diameter D of 8 becomes smaller. Since the size of the expansion varies depending on the amount of injected air, the diameter D of the insertion passage 8 can be adjusted depending on the amount of injected air. Therefore, after inserting and mounting the inner needle 3 into the insertion passage 8 of the outer tube 2, air is sent into the air chamber 7 to inflate the elastic film 6 to reduce the diameter D of the insertion passage 8 and the shaft body of the inner needle 3. It can be tightly attached to 11 or it can be tightened. Then, by closing the cock 10, the diameter D of the insertion passage 8 can be kept constant.

After completion of the puncturing operation, the outer tube 2 is left indwelling, only the inner needle 3 is removed, and various treatment tools and inserts such as endoscopes are inserted using the outer tube 2 as a guide. At this time, the diameter D of the insertion passage 8 is adjusted according to the outer diameter of the insert by the air supply method described above. As a result, the airtightness of any diameter insert can be maintained. Further, since the diameter D of the insertion passage 8 can be freely adjusted, the airtightness when inserting the insert can be ensured. On the other hand, by adjusting the diameter D of the insertion passage 8 to be slightly smaller when the insert is taken in and out, the resistance at that time can be made as small as possible.

Further, since one outer tube 2 can be selectively used with inserts such as endoscopes and treatment instruments having different diameters while completely maintaining airtightness, the number of trocars 1 piercing the patient can be minimized. The burden on the patient can be greatly reduced.

FIG. 2 shows a jacket tube according to a second embodiment of the present invention. In this trawl 1, the range of the elastic film 6 provided on the inner surface of the cylindrical body 4 is shortened, and the elastic film 6 is arranged in the range from the base end of the cylindrical body 4 to the middle part thereof. Others are the same as those in the above-mentioned embodiment. Since the elastic film 6 is partially arranged on the inner surface of the tubular body 4, friction with respect to the insert at other portions can be reduced, and the operability of the insert at this point can be improved. ..

The present invention is not limited to the above-mentioned embodiment, and various modifications can be considered within the scope of the present invention. For example, the mantle is not limited to the tracar.

[0019]

[Effect of the device]

 As described above, according to the present invention, inserts such as endoscopes and treatment instruments having different diameters can be selectively used with one outer tube while completely maintaining airtightness, and at the time of inserting and removing the inserts. The resistance can be made as small as possible, and the operability of moving in and out can be improved. In addition, the number of trocar outer tubes or the like that penetrate the patient can be minimized, and the burden on the patient can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a trocar according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a trocar according to a second embodiment of the present invention.

[Explanation of symbols]

1 ... trocar, 2 ... outer tube, 3 ... inner needle, 4 ... cylindrical body, 6
... elastic membrane, 7 ... air chamber, 8 ... insertion passage, 9 ... communication pipe, 10 ...
cock.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An insertion passage for an insert is formed on an inner surface of an outer tube, and a sealing elastic film is provided which is capable of contracting in a radial direction of the insertion passage. A jacket tube, which is formed by expanding and contracting to form a chamber for varying the inner diameter of the insertion passage.