JPH0546406Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a trocar used for inserting an endoscope, a surgical tool, etc. into a body cavity of a patient through the body skin.

[Prior Art] A trocar is used as a guide for inserting an endoscope such as a laparoscope, a surgical instrument, or other member into a body cavity without making an incision or the like. This trocar consists of an inner needle with a sharp tip at the tip of its shaft for penetrating the body skin, and an outer tube into which the inner needle is inserted. . Then, the inner needle is inserted into the mantle tube, the needle tip is assembled so as to protrude from the tip of the mantle tube, and the needle tip is inserted through the body skin and enters the body together with the mantle tube, After guiding the inner needle into the body cavity, the inner needle is pulled out from the outer tube, and an insertion path for inserting an endoscope, a surgical instrument, etc. can be secured using the outer tube as a guide. This makes it possible to minimize the number of damaged areas in the body and protect tissues within the body when performing internal diagnosis and treatment.

[Problems to be solved by the invention] By the way, when performing internal examinations, diagnosis, etc. using an endoscope, it is necessary to
By supplying nonflammable gas such as CO2 into the body cavity at a predetermined pressure, a wide field of view can be obtained for inspection and
We strive to provide efficient diagnosis and treatment. As mentioned above, when the trocar is inserted into the body, the inner needle is pulled out, and the insertion section of the endoscope is inserted, the space between the outer surface of the insertion section and the inner surface of the outer tube is airtight. A sealing member is installed inside the mantle tube in order to keep the above-mentioned nonflammable gas from leaking from the gap between the insertion portion and the mantle tube. However, since the outer surface of the mantle tube and the body flesh are not in close contact, nonflammable gas leaks outside from around the outer surface of the mantle tube. In particular, if examinations, diagnosis, and treatment are continued for a long time, nonflammable gas leaks from the body cavity, so it is inconvenient that nonflammable gas must be frequently supplied during operation of the endoscope. It was hot.

The present invention has been made in view of the above points, and its purpose is to provide a trocar that can reliably seal the space between the mantle and the body's flesh. .

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention includes a flexible bag that is attached to surround the outer peripheral surface of the cannula, and a flexible bag that is placed inside the flexible bag. The structure is characterized in that by supplying fluid, the fluid can be bulged outward in the radial direction of the mantle tube.

[Operation] The trocar is inserted into the outer tube until the flexible bag attached to its outer circumferential surface is at least partially embedded in the body, and the inner needle is pulled out. In this state, if the flexible bag is inflated when or after inserting the insertion part of the endoscope, the body flesh will be compressed by the flexible bag. The airtightness of the area is improved. Therefore, when nonflammable gas is supplied into the body cavity through the insertion part of the endoscope,
Since this nonflammable gas will not leak to the outside, the body cavity can be maintained in an inflated state for a long period of time, and the need for replenishing nonflammable gas can be extremely reduced.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, FIGS. 1 and 2 show the overall configuration of a trocar. The trocar 1 has an inner needle 10 and an outer cannula 2.
0, and the inner needle 10 is constructed by integrally connecting a needle tip 11 and a shaft portion 12 for piercing the body skin, and the tip portion of the needle tip 11 is formed sharply. ing. Further, at the proximal end portion of the inner needle 10, a large diameter portion 13 and a finger rest pushing portion 14 are successively provided. On the other hand, the outer tube 20 is made of a thin metal pipe, and has an insertion section 21 formed therein for passing the inner needle 10 therethrough, and a large diameter section 22 formed at its proximal end. A seal member 23 is attached to the large diameter portion 22.

Large diameter portion 2 on the outer circumferential surface of the mantle tube 20 described above
On the 2 side, there is a flexible container 3 made of a highly flexible and slippery material such as silicone rubber.
0 is attached to surround the mantle tube 20. Compressed air can be introduced into the flexible bag 30, and for this purpose, an air pipe 31 is provided in the flexible bag 30.
is connected. At the other end of the air pipe 31,
As an air pressure source, it is connected to, for example, a cylinder 32, and by opening and closing an on-off valve 33 provided on the cylinder 32, compressed air can be supplied to the flexible container bag 30. ing. Here, the flexible container 30 does not necessarily need to be fixed to the outer surface of the mantle tube 20, but in order to be smoothly embedded in the body flesh, it is fixed to the mantle tube 20. is preferable. Further, the width of the flexible container 30, that is, the length in the axial direction of the mantle tube 20, needs to be long to a certain extent, and as will be described later, when the trocar 1 is inserted into the body,
It is necessary that at least a portion thereof becomes embedded within the body skin.

As shown in FIG. 2, the trocar 1 having the above-described configuration is configured such that the inner needle 10 is inserted into the insertion portion 21 of the outer tube 20, and the needle tip is inserted into the outer tube 20.
The large diameter portion 13 protrudes from the tip of the mantle tube 2.
While in contact with the large diameter portion 22 of 0, the needle is inserted through the patient's body skin to a position that reaches into the body cavity to be diagnosed and treated. When the inner needle 10 is pulled out from the outer tube 20 in this state, the insertion portion 21 in the outer tube 20
A passage toward the body cavity is thus formed. Incidentally, a flexible bag 30 is provided on the outer circumferential surface of the mantle tube 20, but this flexible bag 30 is made of a material with good slippage, and is in a state in which no pressure is supplied to the inside. If retained, the flexible bag 30 will not provide resistance when the trocar 1 is inserted into the body.

Therefore, as shown in FIG.
If the insertion section 2a of the endoscope 2 is inserted through the endoscope 1, the insertion section 2a can be inserted into the body cavity, and the interior of the body cavity can be inspected/diagnosed or treated. You will be able to do this.

Here, when diagnosing or performing treatment inside this body cavity, the insertion section 2a of the endoscope 2 is
A non-flammable gas such as CO2 can be supplied into the body cavity through the body cavity to cause the body cavity to expand. If the nonflammable gas supplied in this way leaks to the outside, the body cavity will contract, so this leakage must be prevented. Here, since a sealing member is interposed between the inner surface of the mantle tube 20 and the outer surface of the insertion portion 2a, there is no risk of nonflammable gas leaking from this portion.

On the other hand, there is a possibility that nonflammable gas may leak from between the outer surface of the mantle tube 20 and the body flesh. However, since the flexible bag 30 is attached to the outer peripheral surface of the mantle tube 20, compressed air is supplied from the cylinder 32 to the flexible bag 30 through the air pipe 31 to cause the tube to expand. By doing so, the flexible bag 30 bulges outward and presses the body flesh, thereby making it possible to bring the space between them into close contact. This allows nonflammable gas to be confined within the body cavity. Therefore, after the insertion of the trocar 1 is completed, the insertion portion 2a
By supplying compressed air to the flexible bag 30 and inflating it until nonflammable gas is supplied into the body cavity, the inside of the body cavity can be kept at a constant level for a long time. It can be maintained in an expanded state.

Note that the fluid supplied into the flexible container 30 is not limited to the compressed air described above, but may be other gases or liquids such as water.

[Effects of the invention] As explained above, according to the invention, the flexible container is attached to the outer circumferential surface of the mantle tube. By supplying fluid into the bag, the flexible bag can be bulged outward in the radial direction of the mantle tube to bring it into close contact with the body flesh, and the fluid can be supplied into the body cavity. It is now possible to reliably prevent nonflammable gas, etc., from leaking out between the body flesh and the flexible bag, and maintain a constant state of expansion within the body cavity over a long period of time. This has excellent effects, such as making it possible to perform diagnosis and treatment efficiently.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view showing the inner needle and outer tube of the trocar separated; FIG. 2 is an external view of the connected state of the inner needle and outer tube; FIG. 3 is an explanatory diagram of the operation. DESCRIPTION OF SYMBOLS 1... Trocar, 2... Endoscope, 2a... Insertion part, 10... Inner needle, 11... Needle tip, 12... Shaft part, 20... Outer tube, 21... Insertion part, 23... …
Seal member, 30...Flexible container, 31...Air piping, 32...Cylinder.

Claims (1)

[Scope of utility model registration request] In a trocar in which an inner needle having a needle point at the tip of the shaft is removably fitted into an outer tube, a flexible bag is attached so as to surround the outer circumferential surface of the outer tube. A trocar characterized in that the flexible container is configured to be able to bulge outward in the radial direction of the mantle tube by supplying fluid into the flexible container.