JP2532420Y2 - Laparoscopic trocar - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laparoscopic trocar for guiding a laparoscope used for examining and diagnosing the inside of an abdominal cavity and performing a medical treatment.

[0002]

2. Description of the Related Art Laparoscopes used for examining organs in the abdominal cavity and for performing treatments are directly pierced into the abdomen so that they are guided to a site where prescribed observation, examination, treatment, and the like are performed. A trocar is used to perforate the abdomen. This trocar is composed of an inner needle whose tip is a sharp needle tip, and an outer tube fitted to the inner needle, with the needle tip protruding from the distal end of the outer tube. When the catheter is inserted into the body in the connected state and reaches the abdominal cavity, the inner needle is detached from the mantle tube to secure a passage for inserting the mantle tube into the abdominal cavity. I have to.

[0003]

When the trocar is inserted into the abdominal cavity, it is necessary to prevent the abdominal organs from being damaged by the tip of the inner needle. Extreme care must be taken with the depth of penetration into the body. Here, in order to ensure safety when the trocar is inserted into the body and to secure an observation field of view when performing a laparoscopic examination, a gas containing CO ₂ gas or the like is previously contained in the abdominal cavity. After filling the abdominal gas to inflate the abdominal cavity, a trocar is inserted. In this way, the risk of damage to the organs in the abdominal cavity due to the trocar is reduced by the amount of inflation of the abdominal cavity. However, depending on the position where the trocar is inserted and the constitution of the patient, the optimum insertion depth is not constant, and there is a possibility that the needle tip may be inserted deeply to a position where it comes into contact with the organ in the abdominal cavity. The same may occur due to the carelessness of the surgeon, etc., and filling the insufflation gas alone is not perfect in terms of ensuring safety.

The present invention has been made to solve the above-mentioned drawbacks and problems of the prior art. The purpose of the present invention is to make it possible for the inner needle to reach the abdominal cavity with a simple structure. It is an object of the present invention to provide a laparoscopic trocar which can surely detect the trocar.

[0005]

In order to achieve the above-mentioned object, the present invention provides an outer tube or a gas passage between the outer tube and the inner needle, and the outer tube has a gas flow passage formed therein. A connector is provided that can be connected to a pipe from a gas supply source, and this connector is equipped with an insertion position detection mechanism made of a flexible bag that allows gas that flows backward from the abdominal cavity to flow when inserted into the body. It is characterized by having a configuration of

[0006]

By adopting such a configuration, first, a peritoneal gas is filled in the abdominal cavity by a well-known insufflator to inflate the abdominal cavity. In this state, a trocar is inserted. At this time, a flexible bag is attached to a connector provided on the outer tube. As a result, when the trocar is inserted to a predetermined position, the gas flow path opens into the abdominal cavity, and as a result, the gas in the pressurized state flows back along the gas flow path, and the flexibility is increased. It can be detected that the container has expanded and the trocar has been guided into the abdominal cavity. Therefore, in this state, if the inner needle is detached from the mantle tube and the laparoscope is inserted into the mantle tube, examination, treatment, and the like by the laparoscope can be performed.

In general, when performing an examination or the like with a laparoscope, a gas is always supplied into the abdominal cavity during the operation in order to maintain the abdominal cavity in an inflated state. A mechanism for detecting the insertion position of the trocar by using a gas supply path provided for this purpose and by attaching a flexible bag to the gas supply path is used, so that the configuration of the detection mechanism is significantly simplified. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. First, FIG. 1 shows the entire structure of the trocar, and FIG. 2 shows a cross section in an exploded state. In the figure,
Reference numeral 1 denotes an inner needle, 2 denotes an outer tube, and the inner needle 1 forms a sharp needle tip 1b at the distal end of a shaft portion 1a, and a base end portion serves as a grip portion 1c to be gripped by an operator performing an operation. ing. Mantle tube 2
Has a cylindrical main body 3 forming an insertion path 3a, and the distal end of the cylindrical main body 3 has a tapered portion 3b, whereby a step cannot be formed between the cylindrical main body 3 and the shaft portion 1a of the inner needle 1. Has become. A valve portion 4 is connected to the base end of the tubular main body 3 in the outer tube 2. This valve part 4 is a cylindrical main body 3
The valve body 6 is slidably mounted in a valve casing 5 provided in a direction orthogonal to the axis of the valve body 6.
Is composed of a seal portion 6a for holding the insertion passage 3a of the cylindrical body 3 in a closed state, and a passage portion 6b provided integrally with the seal portion 6a and having the same diameter as the insertion passage 3a. The seal portion 6a faces the insertion path 3a by the urging force of the spring 7, and the insertion path 3a is in a closed state. A pusher 8 is connected to the valve body 6, and when the pusher 8 is pushed by a finger, the passage 6b is inserted into the insertion path 3a.
Is displaced to the position, and the insertion portion of the inner needle 1 or the laparoscope can be inserted therethrough.

Next, a gas passage 10 for supplying insufflation gas into the abdominal cavity is provided in a thick portion of the mantle tube 2, and the gas passage 10 is formed by a tapered portion 3 b of the cylindrical main body 3. And communicates with a connector 11 mounted near a portion where the tubular body 3 and the valve portion 4 are connected to each other. Also, a cock 12 is provided at an intermediate position of the connector 11. As is clear from FIG. 1, the connector 11 is connected to a pipe 14 from a cylinder 13 for insufflation gas by a known luer lock mechanism or the like.
A pressure regulating valve 15 is provided in the middle of 4. The connector 11 has a flexible bag 16 instead of the pipe 14.
The lure lock mounting portion 16a can be mounted. The flexible bag 16 constitutes a mechanism for detecting the depth of insertion of the trocar into the abdominal cavity.

In this embodiment, the trocar is inserted as described above.
The inner needle 1 is incorporated into the outer tube 2, and the tip of the inner needle 1 is made to protrude from the tip of the tubular main body 3. At the same time, the luer lock mounting portion 16a of the flexible bag 16 is attached to the connector 11. The abdominal cavity is previously filled with insufflation gas using a syringe or the like, and the abdominal cavity is inflated with the pressure of the insufflation gas.

Therefore, the trocar is inserted into the body.
As shown in FIG. 3, the needle tip 1 of the inner needle 1 of this trocar
b is pierced into the abdominal cavity, and when the tapered portion 3b of the tubular main body 3 of the mantle tube 2 reaches the inside of the abdominal cavity filled with insufflation gas, the insufflation gas in a pressurized state is supplied to the gas passage. 10 flows backward from the connector 11 into the flexible bag 16. As a result, the flexible bag 16 expands,
It can be confirmed that the trocar has reached the abdominal cavity. Here, the distance from the needle tip 1b of the inner needle 1 to the tapered portion 3b of the tubular main body 3 of the mantle tube 2 is relatively short, and the abdominal cavity is filled with insufflation gas and expanded. At the stage before the tip 1b comes into contact with the organ in the abdominal cavity, the insertion position of the trocar by the inflation of the flexible bag 16 is reliably detected.

After it is confirmed that the trocar has been inserted to a predetermined position in the abdominal cavity, the cock 12 is closed, the flexible bag 16 is detached from the connector 11, and the trocar is removed from the cylinder 13. By connecting the pipe 14 and attaching / detaching the inner needle 1 to allow the laparoscope to pass through the mantle tube 2, it becomes possible to perform examination, diagnosis, treatment, and the like in the abdominal cavity.

[0013]

As described above, according to the present invention, the gas flows back from the abdominal cavity to the connector which can be connected to the pipe from the gas supply source through the gas flow path provided in the mantle tube and is inserted into the body. The flexible bag that allows the gas to flow is attached, so when the trocar is inserted while insufflation gas is injected into the abdominal cavity, it is reliably detected that the tip of the trocar has reached the abdominal cavity. And the risk of damaging the organs in the abdominal cavity due to the tip of the inner needle is reliably prevented, so that safety is improved.

[Brief description of the drawings]

FIG. 1 is an external view of a trocar showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a state in which an inner needle and an outer tube of the trocar of FIG. 1 are separated.

FIG. 3 is a diagram illustrating the operation of a trocar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner needle 2 Outer tube 10 Gas flow path 11 Connector 12 Cock 16 Flexible bag 16a Luer lock attachment part

Claims (1)

(57) [Scope of request for utility model registration] An inner needle is removably inserted into an outer tube, and the inner needle is connected to the outer tube so that the inner needle is inflated with an insufflation gas for expanding the abdominal cavity. By inserting the inner needle into and removing the inner needle from the outer tube, a passage for inserting the laparoscope into the body is provided by the outer tube, and gas is supplied between the outer tube or the outer tube and the inner needle. In addition to providing a flow path, the mantle tube is provided with a connector that communicates with this gas flow path and can be connected to a pipe from a gas supply source. In this connector, gas that flows backward from the abdominal cavity when piercing the body is introduced. A trocar for a laparoscope, wherein a puncture position detecting mechanism comprising a flexible bag to be inserted is mounted.