JP3159515B2 - 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 trocar comprising an outer tube inserted into an abdominal wall of a living body and an inner needle inserted into the outer tube.

[0002]

2. Description of the Related Art A trocar consisting of an outer tube and an inner needle is
Penetrating the body wall of the living body with the inner needle inserted in the mantle tube,
After insertion into the body cavity, the inner needle is removed and the mantle tube is placed on the body wall, and the mantle tube is used as a guide for inserting an endoscope such as a laparoscope or a treatment tool into the abdominal cavity.

[0003] Therefore, the trocar is always used in a sterilized state. Usually, when the trocar is sterilized with ethylene oxide gas, not only the trocar but also an endoscope and treatment tools are sterilized together. Here, if the outer tube of the trocar and the inner needle are separately sterilized, there is a risk of loss. Therefore, the trocar is sterilized with the inner needle inserted into the outer tube.

In the trocar, the inner diameter of the outer tube and the outer diameter of the inner needle are substantially the same in order to ensure stability during insertion. For this reason, it cannot be said that the fitting portion between the outer tube and the inner needle has a space for allowing the sterilizing gas to sufficiently penetrate the entire length thereof.

In order to solve the above problem, as shown in Japanese Patent Publication No. 53-235, a groove extending in the axial direction of the inner needle is provided on the outer surface of the inner needle, and the outer tube and the inner needle are provided. In some cases, a sufficient space is provided between them. When the inner needle enters the bladder, the bladder fluid rises up the groove,
It is intended for the operator to know that the inner needle has reached the bladder.

[0006]

However, in the trocar disclosed in Japanese Patent Publication No. 53-235, the groove extends from both ends of the outer tube with the inner needle inserted into the outer tube. In the trocar having such a configuration, a large space is partially formed between the outer tube and the inner needle on the trocar distal end side, and when the trocar is punctured into the body wall, tissues such as nerves and blood vessels are sandwiched in the space. Risk of tissue damage.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a gas sterilizing device that does not damage tissues around a mantle tube when a trocar is punctured into a body wall. It is to provide an excellent trocar.

[0008]

SUMMARY OF THE INVENTION The present invention, in order to achieve the above object, according to claim 1, the outer tube is punctured into a body cavity, and having a head at the proximal end portion of the insertion portion, the distal end A trocar having a pointed end and an inner needle insertable into the outer tube, the outer surface of the inner needle positioned inside the outer tube with the inner needle inserted into the outer tube. At least one portion extends from the vicinity of the head to the vicinity of the pointed end, and is connected to a gap between the head and the base end of the mantle tube.
It is characterized in that a recessed portion is provided. Claim 2 is the body
A mantle tube punctured into the cavity and a head at the proximal end of the insertion section
At the same time, the distal end has a sharp point and is inserted into the mantle tube.
A trocar comprising an insertable inner needle;
Is located inside the mantle tube when inserted into the mantle tube
Near the head at least at one position on the outer surface of the inner needle
Extends from to the vicinity of the pointed tip, and sterilization gas can be introduced
It is characterized by providing a concave portion .

[0009]

When the inner needle is inserted into the outer tube, the concave portion provided on the outer surface of the inner needle is located in the outer tube, and when the trocar is punctured into the body wall, the tissue around the outer tube is pinched by the concave portion. However, at the time of sterilization, sterilization gas enters between the outer tube and the inner needle through the concave portion and is sterilized.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 5 show a first embodiment. As shown in FIGS. 1 and 2, the trocar 1 comprises an outer tube 2 and an inner needle 3.
It is composed of The inner needle 3 is formed of, for example, stainless steel or ABS resin, and has an insertion portion 4.

A head 5 is provided at a base end of the insertion portion 4.
A tip 6 is provided at the tip. As shown in FIG. 3, a plurality of recessed grooves 7 having a triangular cross section are provided on the outer surface of the insertion portion 4 along the axial direction of the insertion portion 4. To the vicinity of the tip 6, and is located inside the mantle tube 2 when inserted into the mantle tube 2.

The mantle tube 2 is made of, for example, a resin such as stainless steel or tetrafluoroethylene, a base member 9 having an insertion tube 9a inserted at the base end of the tube member 8, and a tube member. And a fixing ring 10 for fixing the base end of the base 8 to the insertion tube 9a of the base 9.

The inner diameter of the outer tube 2 and the outer diameter of the inner needle 3 are formed to be substantially the same, so that when the inner needle 3 is inserted into the outer tube 2, the pointed end 6 protrudes from the distal end opening of the outer tube 2. It has become.

As shown in FIG. 4, the head 5 of the inner needle 3 is formed by cutting out a part of a disk to form a flat portion 11, and when the trocar 1 is laid on a desk or the like in a horizontal position. It is formed so that it does not roll. Further, as shown in FIG. 5, the base 9 of the mantle tube 2 is formed with a flat portion 12 parallel to the flange portion 9b, and does not roll when the mantle tube 2 is laid on a desk or the like. It is formed as follows.

The trocar 1 thus constructed is sterilized before use. Usually, when sterilizing the trocar, it is performed with the inner needle 3 inserted into the outer tube 2. This is because not only the trocar 1 but also an endoscope, treatment tools, and the like are used together during sterilization. Therefore, if the outer tube 2 and the inner needle 3 are sterilized separately, they may be lost.

The entire trocar 1 placed in the sterilizer is exposed to sterilizing gas. The sterilizing gas enters the inside of the groove 7 through a gap between the tube 8 of the outer tube 2 and the insertion portion 4 of the inner needle 3, and the sterilizing gas accumulated in the groove 7 is again inserted into the tube 8 of the outer tube 2. The needle 3 comes out of the trocar 1 through the gap of the insertion portion 4.

In this manner, the trocar 1 is sterilized not only on its outer surface but also on its entire inner surface. When the target body wall is punctured and inserted into the body cavity at the time of completion of the sterilization, the mantle tube 2 is placed in the body wall, and the inner needle 3 is removed from the mantle tube 2 to guide the mantle tube 2 as a guide. Observation and treatment can be performed by inserting an endoscope, a treatment tool, and the like into a body cavity.

FIG. 6 shows a second embodiment, in which (a)
In the figure, the insertion portion 4 of the inner needle 3 inserted into the outer tube 2 is formed in a triangular prism shape, and a plurality of recesses 13 are formed in the insertion portion 4. (B) A plurality of concave portions 14 are formed by forming a flat portion parallel to the insertion portion 4 of the inner needle 3 inserted into the outer tube 2. The recesses 13 and 14 are provided along the axial direction of the insertion portion 4, and the grooves 7 extend from the vicinity of the head 5 to the vicinity of the pointed end 6. It is located inside the mantle tube 2.

FIG. 7 shows a state where the endoscope 16 is inserted into the trocar 15. The insertion section 1 is provided on the operation section 17 of the endoscope 16.
8 is connected, and a bending portion 19 is
The distal end component 20 is provided via the. Further, the operating section 17 is provided with a bending lever 22 for bending the eyepiece section 21 and the bending section 19, a channel base 23 having a luer opening, and a universal cord 2.
4 are connected.

FIG. 8 shows a cross section of the eyepiece 21, which is the same for a soft tube and a hard tube. Reference numeral 25 denotes an eyepiece main body. At the center of the eyepiece main body 25, an end of an image guide fiber 26 inserted into the insertion portion 18 is attached. The end face of the image guide fiber 26 is connected to an eyepiece group 28 held by a lens holder 27. Are facing each other. Further, a diopter ring 29 for moving the lens holder 27 forward and backward in the axial direction is fitted around the outer periphery of the eyepiece main body 25. Then, the eyepiece main body 25 and the diopter ring 29
Are fixed so that they do not interfere with each other

A concave portion 31 is provided on the eyepiece side end surface of the holding cylinder 30 for holding the lens holder 27 so as to be able to advance and retreat.
A cover glass 32 is fixed in this recess in a liquid-tight manner. A detection member 33 is detachably screwed and fixed to the eyepiece main body 25 outside the holding cylinder 30. An annular protrusion 34 is integrally provided on the outer peripheral edge of the detection member 33, and the inside of the annular protrusion 34 is formed in a concave portion 35. The height H of the annular projection 34 differs depending on the type of endoscope.

An adapter (not shown) of the photographing device is attached to the eyepiece 21 configured as described above. The adapter has a detection pin (not shown) protruding therefrom. When the detection pin comes into contact with the concave portion 35 of the detection member 33, the height H of the annular protrusion 34 is detected. By recognizing the type, the photographing device can automatically set the exposure condition.

Usually, the eyepiece main body 25 is connected to the eyepiece 21.
When the television camera is mounted on the eyepiece 21, the eyepiece main body 25 is first removed from the holding barrel 30 as shown in FIG.
Then, the TV camera adapter 30b is screwed and fixed to a. As a result, an image obtained by the endoscope is displayed on a television monitor (not shown).

In the eyepiece 21 configured as described above, the cover glass 32 and the concave portion 35 of the detecting member 33 are formed on the same surface, so that it is easy to clean dirt and the like adhered to the surface of the cover glass 32. . In addition, since the eyepiece main body 25 and the diopter ring 29 are fixed in a positional relationship that does not interfere with each other, the diopter ring 29 does not rotate to cause a focus shift when the eyepiece main body 25 is attached or detached. .

FIG. 10 shows a cross section of the connecting portion 36 between the operating portion 17 and the insertion portion 18. Here, the case where the insertion portion 18 is a rigid tube will be described. Reference numeral 37 denotes a rigid tube, and a connection member 39 is fitted to the rear end 38 of the tube. Rear end 3
8 is subjected to an appearance treatment by, for example, black nickel chrome treatment to prevent reflection by illumination light. Further, a V-shaped groove 40 is formed on the outer circumferential surface of the connecting member 39 over the entire circumference.
Is engraved.

A connection tube 41 is fitted on the outer peripheral side of the rigid tube 37 and the connection member 39, and a screw portion 43 screwed and fixed to the operation portion main body 42 is provided on the inner periphery of the rear end. A screw hole 44 penetrating from the outer peripheral surface to the inner peripheral surface is formed in a part of the connection pipe 41, and a sword screw 45 is screwed into the screw hole 44. The tip of the sword screw 45 is pressed into the V-shaped groove 40 of the connecting member 39, and the connecting member 39 and the connecting pipe 41 are connected.

In the thus constructed connecting portion 36, since the rear end portion 38 of the hard tube 37 is subjected to an appearance treatment by, for example, black nickel chrome treatment to prevent reflection by illumination light, it is safe during treatment. Monitor image is obtained. Further, when the insertion portion 18 is formed of the rigid tube 37, a guide coil of an angle wire is not required inside the insertion portion 18 and a space can be provided by that amount, so that other built-in components (image guide fiber, Light guide fiber).

[0029]

As described above, according to the present invention, the inner needle is provided with the concave portion at at least one position on the outer surface located inside the outer tube when inserted into the outer tube. When the trocar is punctured into the body wall, the tissue around the mantle tube is not pinched by the recess, and sterilization gas is sterilized by entering between the mantle tube and the inner needle through the recess during sterilization. . Therefore, it is possible to provide a trocar that does not damage the tissue surrounding the mantle tube and is excellent in gas sterilization.

[Brief description of the drawings]

FIG. 1 is a side view showing a cross section of a part of a trocar according to a first embodiment of the present invention.

FIG. 2 is a side view of the trocar of the embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a plan view of the inner needle of the embodiment.

FIG. 5 is a sectional view taken along the line BB in FIG. 1;

FIGS. 6A and 6B are cross-sectional plan views of a trocar according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing the entire endoscope.

FIG. 8 is a longitudinal side view of an eyepiece of the endoscope.

FIG. 9 is an explanatory diagram when a television camera adapter is connected to the eyepiece of the endoscope.

FIG. 10 is a side view showing a cross section of a part of a connecting portion between the operation unit and the insertion unit of the endoscope.

[Explanation of symbols]

1 ... trocar, 2 ... mantle tube, 3 ... inner needle, 7 ... groove (recess).

Claims (2)

(57) [Claims] 1. A trocar comprising: an outer tube punctured into a body cavity; and an inner needle having a head at a proximal end of an insertion portion and having a pointed end at a distal end and insertable into the outer tube. In the head, the inner needle extends from the vicinity of the head to the vicinity of the pointed end at at least one position on the outer surface of the inner needle located inside the outer tube with the inner needle inserted into the outer tube. Department and front
A trocar comprising a concave portion communicating with a gap between the outer tube and a proximal end portion of the outer tube . 2. A mantle tube punctured in a body cavity, and an insertion portion
It has a head at the base and a point at the tip.
And a trocar comprising an inner needle insertable into the outer tube.
In the state where the inner needle is inserted into the outer tube,
The head at least at one location on the outer surface of the inner needle located
Extending from the vicinity of the tip to the vicinity of the point, and supplying sterilizing gas.
A trocar characterized by having a recess that can be introduced.