JP2565812Y2 - Endoscope injection needle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection needle for an endoscope which is used by being introduced into a body cavity through a channel of the endoscope.

[0002]

2. Description of the Related Art For example, when a medical solution is directly administered to an affected part in a body cavity, it is known that an injection needle is introduced into the body cavity using a channel of an endoscope to perform injection. The injection needle used at this time includes an outer sheath that can be inserted into the insertion channel of the endoscope, an inner tube that is inserted into the outer sheath so as to be able to advance and retreat, and a needle body attached to the tip of the inner tube. Consists of

In such an injection needle, if the needle protrudes more than necessary from the distal end of the outer sheath, it will puncture the wall of the body cavity at a depth more than necessary. Therefore, conventionally, Japanese Unexamined Patent Publication No. Sho 62-2926 and Japanese Utility Model Laid-Open No. 2-143947 have a configuration as shown in FIG. That is, a regulating member 3 made of an elastic tube or a metal pipe is attached to the outer periphery of the distal end portion of the outer sheath 2 through which the inner tube 1 is inserted, and the inner diameter of the distal end portion of the outer sheath 2 is smaller than that of the other portions. The step of the portion that changes in size is set as the contact portion 4, and the contact end surface 6 provided on the injection needle 5 is brought into contact with the contact portion 4 to regulate the amount of protrusion of the needle 5 from the outer sheath 2. Was.

[0004]

However, according to this conventional structure, since the regulating member 3 is fixed to the outer peripheral surface of the outer sheath 2 by bonding, the needle member 5 is attached to the contact portion 4. While repeating the operation of abutting the contact end face 6 several times, the attachment strength of the regulating member 3 may be reduced,
It is necessary to devise a method for increasing the mounting strength, which causes an increase in cost.

Further, since the regulating member 3 is attached to the outer peripheral surface of the outer sheath 2 as a separate member, the number of components is increased and the structure is complicated, which also causes an increase in manufacturing cost.

If the regulating member 3 is formed of a glossy material such as a metal pipe, the illumination light from the endoscope is reflected on the outer surface of the metal pipe and becomes an endoscope image. In some cases, halation occurred, making observation difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problem, and an object thereof is to provide an endoscope which has a relatively simple structure and can prevent the needle from protruding too much from the distal end of the outer sheath. To provide an injection needle.

[0008]

Means and action for solving the problems Note for endoscope of the present invention
The shooting needle has an outer sheath with a locking abutment at the tip,
The needle is inserted into the outer sheath so that it can advance and retreat freely,
An inner tube having a locking member abutting on the contact portion;
Wherein the locking contact portion has an outer diameter of the outer sheath outer diameter.
And the thickness is equal to the thickness of the outer sheath.
And the outer sheet by thermoforming so as to have almost the same dimensions as
Locking formed integrally and provided on the needle body at the locking contact part
Contact the contact surface of the member and protrude from the end of the outer sheath
This controls the amount of protrusion of the needle body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an entire endoscope injection needle 10. The injection needle 10 includes an outer sheath 11 and the outer sheath 11.
Has an inner tube 12 inserted therein so as to be able to advance and retreat, and the outer sheath 11 and the inner tube 12 are each formed of a flexible resin such as Teflon or the like.

The outer sheath 11 has an inner diameter of 1.3 to 1.3.
The outer sheath 11 has a thickness of 0.15 mm.
mm, and the outer diameter thereof is a dimension that can be inserted into the insertion channel 9 of the endoscope 8 as shown in FIG.

At the tip of the inner tube 12, a tubular needle 13 is attached. A tubular locking member 14 is fitted and fixed to the outer periphery of the proximal end of the tubular needle body 13.
The locking member 14 is fixed to the needle 13 so as to be located at the tip of the inner tube 12. The distal end surface of the locking member 14 is a first contact surface 16 that contacts a locking contact portion 15 formed on the outer sheath 11 as described later.

The distal end of the outer sheath 11 has a locking abutting portion 15 having an edge protruding inward in the radial direction.
Are provided integrally with the outer sheath 11 by thermoforming. The thickness of the locking abutting portion 15 is substantially the same as the thickness of the outer sheath 11, and the tip of the outer sheath 11, that is, the distal end face 17 of the locking abutting portion 15, is flat and has no irregularities. Surface.

The base end surface of the locking contact portion 15 is a second contact surface 18 that contacts the first contact surface 16 of the above-described locking member 14. Further, the outer diameter of the locking portion 15 is the same as the outer diameter of the outer sheath 11 in a portion that is not thermoformed. The diameter of the opening 19 surrounded by the locking portion 15 is the needle 1
3 is formed slightly larger than the outer diameter of the needle body 13.
Can be passed freely.

The outer diameter of the locking member 14 is larger than the inner diameter of the opening 19 by 0.3 mm or more.
As shown in FIG. 4, the first contact surface 16 of the locking member 14 reliably contacts the second contact surface 18 of the contact portion 15, and the needle 13 projects from the distal end of the outer sheath 11. Length, that is,
The amount of protrusion of the needle 13 is accurately regulated.

On the other hand, a proximal body 21 is attached to the proximal end of the outer sheath 11. The protruding piece 22 protruding from the distal end of the hand body 21 is press-fitted into the base end of the outer sheath 11 to be fixedly attached. Further, a pressing ring member 23 is fitted around the outer periphery of the proximal end of the outer sheath 11 corresponding to the portion into which the projecting piece 22 is press-fitted, and the proximal end of the outer sheath 11 is tightened. The projecting piece 22 of the main body 21 is hard to come off.

A through hole 26 is formed in the hand body 21.
A pipe 27 having a distal end connected to the proximal end of the inner tube 12 is inserted into the through hole 26. The base end of the pipe 27 is insert-molded and fixed to a base 28 formed of a resin such as polypropylene. The base 28 has a connection port 29 for connecting an injector such as a syringe (not shown). The connection port 29 and the lumen of the pipe 27 are
Are communicated through the inner hole.

A protrusion 3 is provided on the outer periphery of the tip edge of the base 28.
The projection 31 is fitted into a slit 32 provided in the hand body 21 and slidably press-fitted. The proximal end wall of the slit 32 forms a first engagement portion 33 that engages the protrusion 31 and prevents the inner tube 12 from being pulled out.

A base 2 is provided on the base end side of the hand body 21.
A second engaging portion 34 that engages the distal end of the inner tube 8 to regulate the advance of the inner tube 12 is provided. And tube 1
2 is advanced, the base 28 is moved to the second engagement portion 34 after the first contact surface 16 of the locking member 14 contacts the second contact surface 18 of the contact portion 15. Engage. Therefore, base 2
If the inner tube 12 is pushed in until the distal end thereof comes into contact with the second engaging portion 34, the inner tube 12 is elastically compressed as shown in FIG. Is maintained.

A projection 35 is provided on the inner peripheral surface near the base end of the through hole 26 of the hand body 21 to elastically press against the outer peripheral surface of the base 28 to maintain the pushed state of the base 28. Have been.

The thus configured endoscope injection needle 10
With the needle 13 pulled into the outer sheath 11, the outer sheath 11 is inserted into the insertion channel 9 of the endoscope 8 to project into the body cavity. At this time, the needle 13 is
Since it is housed inside, the needle 13 does not damage the insertion channel 9 of the endoscope 8 or the human body tissue.

Then, after the distal end of the outer sheath 11 approaches the target portion, the base 28 is advanced, and the first contact surface 16 of the locking member 14 is brought into contact with the contact portion of the outer sheath 11 via the inner tube 12. When the needle body 13 is pushed down until it comes into contact with the second contact surface 18 at 15, the needle body 13 protrudes from the distal end of the outer sheath 11 by a predetermined length through the opening 19 in the contact portion 15.

When the cap 28 is further pushed in from this state, the cap 28 is engaged with the second engaging portion 34. Inner tube 1
2 is elastically compressed in the outer sheath 11, and the outer peripheral surface of the base 28 is elastically pressed against the projection 35 of the second engaging portion 34 to prevent the base 28 from retreating. The protruding state of the needle 13 is maintained.

On the other hand, since the inner tube 12 is elastically compressed in the outer sheath 11, the first contact surface 16 is
, But does not elastically deform in the radially increasing direction. That is, when the inner tube 12 is compressed to the buckling limit, the locking member 14
The results of measuring the amount of force that presses the contact surface 16 and the amount of force that causes the locking contact portion 15 to elastically deform in the radially expanding direction are as shown in the following table. Does not elastically deform in the radially expanding direction, and reliably regulates the protruding length of the needle 13.

[Table] (a) (b) Outer sheath inner diameter: φ1.4 mm φ1.5 mm Outer sheath outer diameter: φ1.7 mm φ2 mm Outer sheath wall thickness: 0.15 mm 0.25 mm Average pushing force: 195 g 270 g 399 g 518 g On the other hand, after fixing the needle body 13 in a protruding state as shown in FIG. 4, the needle body 13 is pierced into the body tissue, and the base is inserted. The drug solution is injected through the inner tube 12 by the syringe attached to 28. After the injection of the drug solution, the base 28 is retracted, whereby the needle 13 is pulled into the outer sheath 11 and the outer sheath 1
1 is removed from the insertion channel 9 of the endoscope 8.

According to the configuration of the above embodiment, the locking abutment 15 for regulating the length of protrusion of the needle 13 is provided on the outer sheath 11.
The locking abutment 15 does not fall into the body cavity and is not left as it is.

Further, since the distal end portion of the outer sheath 11 including the locking contact portion 15 is integrally formed of a synthetic resin such as Teflon, when this is used, light from the endoscope 8 is used. A good endoscope image is obtained without reflection and halation.

Further, since the outer diameter of the locking contact portion 15 is the same as the outer diameter of the portion of the outer sheath 11 which is not thermoformed, a step is formed between the needle body 13 and the distal end of the outer sheath 11. , Needle 1
Even if 3 is punctured into the body cavity wall, it does not pierce the tip of the outer sheath 11. As a result, bleeding caused by the outer sheath 11 piercing the needle body 13 is prevented as much as possible.

If the outer sheath 11 and the inner tube 12 in the above embodiment are formed of a transparent synthetic resin, the needle 13 can be inserted into the blood vessel by observing the backflow of blood into the inner tube 12 from the outside. The puncture can be confirmed, and the drug solution can be reliably injected into the blood vessel.

[0029]

According to the present invention, as described above, according to the present invention, the locking contact portion provided near the distal end of the outer sheath against which the locking member of the inner tube having the needle body abuts is formed by thermoforming. Since it is formed integrally with the sheath, there is no need for an extra member to regulate the length of the protruding needle body, and there is no need for a special structure for fixing such a member. In addition, the manufacturing cost can be reduced. Since the locking contact portion is formed so that its outer diameter is the same as the outer sheath outer diameter, when puncturing the needle body, the contact portion pierces the distal end of the outer sheath.
To prevent piercing up to the thick part. Further
The thickness of the abutting part is approximately the same as the thickness of the outer sheath.
The length of the needle body in the axial direction
The length of the rigid end of the endoscope injection needle can be shortened accordingly.
Wear.

Since the locking abutment is formed integrally with the outer sheath, if necessary, a synthetic resin such as Teflon or the like is used to prevent the illumination light from the endoscope from reflecting and causing halation. It can be easily formed.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of an injection needle for an endoscope according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a perspective view of an endoscope using the injection needle for an endoscope according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of the vicinity of the distal end of the injection needle for an endoscope according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view of the vicinity of a distal end portion of a conventional endoscope injection needle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Endoscope injection needle, 11 ... Outer sheath, 12 ... Inner tube, 13 ... Needle body, 14 ... Locking member, 15 ... Locking contact part.

Claims (1)

(57) [Scope of request for utility model registration] An outer sheath having a locking abutment at a tip thereof;
An inner tube which is inserted into the outer case so as to be able to advance and retreat, and has a locking member at its tip which abuts against the needle body and the contact portion.
And an outer diameter of the engaging contact portion is equal to the outer diameter of the outer sheath, and the thickness of the outer contact is equal to that of the outer sheath .
The outer sheath is formed by thermoforming so that it has almost the same dimensions as the wall thickness.
An injection needle for an endoscope, which is formed integrally with a syringe.