JPH06237887A - Structure of air-and water supplying nozzle for endoscope - Google Patents

Abstract

PURPOSE:To provide an insulated and compact air- and water supplying nozzle structure for the endoscope, protected from damage by the setting screw. The structure is composed of metallic nozzle connecting to the air- and water supplying pipe, and nozzle cap that is made of a insulating material and covers the part of nozzle body exposed from the tip of rigid part, and is easily attached to and removed from the body of nozzle. CONSTITUTION:The nozzle body 50 connecting to air- and water supplying nozzle is formed of metal, and protected from damage by the setting screw. The exposed part from the tip of rigid part is covered by the nozzle cap 52 made of plastics. The structure becomes compact by this process. The spouting quantity of compressed air or liquid can be controlled by changing the area of opening of the nozzle 66 through adjusting the comparative distance between the nozzle body 50 and the nozzle cap 52.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air supply / water supply nozzle structure of an endoscope, and more particularly, to an air supply / water supply port formed in a rigid portion of an endoscope tip. Air supply of an endoscope that injects compressed air or liquid (cleaning liquid) supplied from the target toward the objective lens exposed at the hard tip.
The present invention relates to a water supply nozzle structure.

[0002]

2. Description of the Related Art When performing treatment using an electric scalpel that employs a return cord with an endoscope, when an exposed metal part of the hard tip touches the patient, the affected part of the electric scalpel moves from the affected part to the touched part. Since there is a risk that an electric current will flow and burns or the like will be applied to a place other than the affected part, it is required to cover the hard tip part with an insulating member.

Therefore, conventionally, the hard end portion of the endoscope is
The body of the hard tip part made of metal is covered with an insulating member such as plastic.

[0004]

However, if the tip hard portion of the endoscope is entirely covered with an insulating member such as plastic, the air feed / air feed attached to the water feed port of the tip hard portion is prevented.
When exchanging the water supply nozzle, the insulating member has to be peeled off from the main body of the distal end hard portion, which is troublesome and the repairability is significantly deteriorated.

From this point of view, it is conceivable that the air supply / water supply nozzle is made of an insulating member such as plastic. However, if the air supply / water supply nozzle is made of plastic, it is made of metal to ensure its strength. Since the wall thickness must be twice as thick as that of, it may not be attached to the air / water supply port. In addition, since the air / water feeding nozzle has the base end connected to the air / water feeding port fixed to the hard body of the tip with a set screw, etc., if the air / water feeding nozzle is made of plastic, There is a risk that the base end will be damaged by the set screw.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a compact endoscope air / water supply nozzle structure having an insulating property and capable of preventing damage by a set screw. And

[0007]

In order to achieve the above-mentioned object, the present invention is attached to an air supply / water supply port formed in a distal end hard portion of an endoscope insertion part, and the air supply / water supply port. In the air / water nozzle of the endoscope in which the injection port for ejecting the compressed air or the liquid supplied from the objective lens exposed to the tip hard portion is formed,
A nozzle body made of metal, which is connected to the water supply port and has a hole communicating with the air supply / water supply port, and an insulating member, and is attached to the nozzle body through its guide groove. A nozzle cap that covers the exposed portion of the nozzle body that is exposed from the tip hard portion when mounted on the nozzle body, and that forms the injection port in a gap with the nozzle body,
It is characterized by consisting of.

[0008]

According to the present invention, since the nozzle body connected to the air / water supply port is made of metal, damage by the set screw can be prevented. Further, since the exposed portion of the nozzle body exposed from the hard tip portion is covered with the nozzle cap of the insulating member, it becomes compact with insulation.

On the other hand, the compressed air or liquid supplied from the air supply / water supply port passes through the hole formed in the nozzle body from the injection port formed in the gap between the nozzle cap and the nozzle body, and the tip end hard portion. It is ejected toward the objective lens exposed to the.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an air / water supply nozzle structure for an endoscope according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an overall view of an endoscope 12 having an air / water supply nozzle 10 to which an air / water supply nozzle structure for an endoscope according to the present invention is applied. In the figure, the endoscope 12 has a hand-side operation portion 14, an insertion portion 16 is connected to the hand-side operation portion 14, and a bending portion 18 is formed at the tip of the insertion portion 16. The bending portion 18 is remotely bent by rotating an operation knob 20 provided on the hand operation portion 14.

A hard tip portion 22 is provided at the tip of the bending portion 18.
As shown in FIG. 2, an objective lens 24, an illuminating lens 26, an illuminating lens 26,
28, the forceps channel 30, and the air / water feeding nozzle 10 are arranged at predetermined positions. As shown in FIG. 3, the distal end hard portion 22 is configured by covering the outer periphery of a metallic distal end hard portion main body 32 formed in a ring shape with a rubber tube 34. Also, the tip hard part body 3
2 has a cap 36 made of plastic on the tip surface 32A.
Is fixed, and the objective lens 24,
The illumination lenses 26, 28, the forceps channel 30, and the windows 40, 42, 44, 46, 48 of the air / water supply port 38 are opened as shown in FIGS. 2 and 3, respectively.

As shown in FIG. 3, the air / water feeding nozzle 10 comprises a nozzle body 50 made of metal and a nozzle cap 52 made of plastic. The nozzle body 50
Is a pipe-shaped metal fitting 54,
The set screw 5 is connected to the air / water supply port 38 by fitting it to the left end in the figure of the air / water supply pipe 56 disposed inside, and is further screwed from the outer peripheral surface of the distal end hard portion 22.
It is fixed to the air / water pipe 56 by 8. At the right end of the air / water pipe 56 in the figure, the air / water pipe 5
A tube 60 for supplying compressed air or a liquid is fixed to 6.

As shown in FIG. 4, the nozzle cap 52 has guide grooves 62 formed at the lower ends of both ends thereof along the shape of the nozzle cap 52. The nozzle cap 52 is attached to the nozzle body 50 by fitting the guide groove 62 into the convex guide portion 64 formed on the peripheral edge of the nozzle body 50 and sliding it in the direction of arrow A in the drawing, and the tip end hard portion 22 The exposed portion of the nozzle body 50 exposed from the above can be covered.

An injection port 66 is opened at the tip of the air / water supply nozzle 10 as shown in FIG. The injection port 66 is formed by a gap 72 between the tapered surface 68 of the nozzle body 50 and the inner tapered surface 70 of the nozzle cap 52, and the compressed air or the liquid supplied from the hollow portion 74 of the metal fitting 54 to the gap 72 is the objective. It can be ejected towards the lens 24 (see FIG. 3).

Further, the inclination angle of the inner tapered surface 70 of the nozzle cap 52 is formed to be larger than the inclination angle of the tapered surface 68 of the nozzle body 50. Therefore, by changing the amount of slide mounting movement of the nozzle cap 52 with respect to the nozzle body 50, the opening area of the ejection port 66 can be appropriately changed. That is, the opening area of the ejection port 66 gradually increases as the nozzle cap 2 is slid from the nozzle body 50 in the removal direction (the arrow B direction). After adjusting the opening area of the injection port 66, the nozzle cap 52 is fixed to the distal end hard portion 22 with an adhesive 76 shown in FIG.

According to the air / water feeding nozzle 10 of the endoscope constructed as described above, the nozzle body 50 connected to the air / water feeding port 38 is formed of a metal harder than plastic, and therefore is set. Even if the nozzle body 50 is fixed with the screw 58, the nozzle body 50 can be prevented from being damaged by the set screw 58. In addition, the nozzle body 5 exposed from the tip hard portion 22
Since the exposed part of 0 is covered with the plastic nozzle cap 52, it is a compact one with insulation compared to the conventional air / water nozzle that makes the entire air / water nozzle by plastic. become.

On the other hand, if the slide mounting movement amount of the nozzle cap 52 with respect to the nozzle body 50 is changed, the injection port 66
Since the opening area of can be expanded or contracted, the amount of compressed air blown out or the amount of liquid jetted can be adjusted.

[0018]

As described above, according to the air / water feeding nozzle structure of the endoscope according to the present invention, the nozzle body connected to the air / water feeding port is made of metal, so that damage due to the set screw is caused. In addition, since the exposed portion of the nozzle body exposed from the hard tip portion is covered with the nozzle cap of the insulating member, it becomes compact with insulation.

[Brief description of drawings]

FIG. 1 is an overall view of an endoscope to which an air / water feeding nozzle structure for an endoscope according to the present invention is applied.

FIG. 2 is a front view of a hard tip portion.

FIG. 3 is a sectional view taken along line AA in FIG.

FIG. 4 is a perspective view of an air / water feeding nozzle structure of an endoscope according to the present invention.

FIG. 5 is a cross-sectional view of an air / water feeding nozzle structure of an endoscope according to the present invention.

[Explanation of symbols]

 10 ... Air supply / water supply nozzle 12 ... Endoscope 22 ... Hard tip part 24 ... Objective lens 38 ... Air supply / water supply port 50 ... Nozzle body 52 ... Nozzle cap 56 ... Air supply / water supply pipe 58 ... Set screw 66 ... Jetting mouth

Claims (1)

[Claims] 1. An endoscope is attached to an air / water supply port formed in a distal end hard part of an endoscope insertion part, and compressed air or liquid supplied from the air / water supply port is exposed to the distal end hard part. In an air-feeding / water-feeding nozzle structure of an endoscope in which a jetting port for ejecting toward the objective lens is formed, a hole connected to the air-feeding / water-feeding port and communicating with the air-feeding / water-feeding port Nozzle body made of a metal, which is formed of an insulating member, is attached to the nozzle body through its guide groove, and is exposed from the hard tip portion when attached to the nozzle body. And a nozzle cap that covers the exposed part of the nozzle and forms the injection port in a gap between the nozzle body and the nozzle body.