JPH0674101U - End of endoscope - Google Patents

Abstract

(57) [Abstract] [Purpose] An object is to provide a distal end portion of an endoscope capable of strongly fixing an illumination lens to a distal end body while ensuring electrical insulation. [Structure] In the distal end portion of an endoscope in which the surface of the distal end body 1 is formed of an electrically insulating synthetic resin material and an illumination lens 25 for expanding the distribution angle of illumination light is arranged on the surface of the distal end body 1. A cylindrical joining cylinder 26 for attaching the illumination lens 25 to the tip end body 1 is integrally molded with the illumination lens 25 with a synthetic resin to form the joining cylinder 26.
Was bonded and fixed to the synthetic resin portion 1b of the tip portion main body 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a distal end portion of an endoscope, and more particularly, to an improvement in a structure in which an illumination lens is adhesively fixed to a portion formed of a synthetic resin of a distal end body.

[0002]

[Prior art]

 In recent years, so-called high-frequency treatments using high-frequency current have come to be generally used in endoscopes, and in order to prevent a burn accident in a body cavity, the electrical insulation of the body of the endoscope tip part is used. Securing became essential.

Therefore, conventionally, at least the outer surface side of the tip body is formed of an electrically insulating synthetic resin material, and the illumination lens faces the emission end surface of the light guide and the surface of the synthetic resin portion of the tip body is opposed. , Was directly fixed by adhesion.

[0004]

[Problems to be solved by the device]

 The adhesive force between an optical lens or a lens formed of transparent plastic and the synthetic resin is much weaker than the adhesive force between the lens and the metal or between the metal and the synthetic resin, for example.

Moreover, in the case of the tip of the conventional endoscope in which the illumination lens is directly adhered to the body of the tip, the adhesive strength is low because a sufficient adhesion margin cannot be obtained. The joint was peeled off due to impact and water leakage occurred.

[0006] As a result, the amount of illumination light is significantly reduced, water entering the interior through the gap between the tip body and the light guide makes the objective optical system cloudy and unobservable, or the mechanism of the curved portion is fixed. There was an accident that made it unusable.

Further, in order to improve the adhesiveness, it is conceivable to increase the diameter of the illumination lens or increase the thickness to lengthen the bonding margin. In that case, however, the diameter of the tip body becomes large. However, there is a problem that various functions are deteriorated such that the amount of illumination light decreases.

Therefore, an object of the present invention is to provide a distal end portion of an endoscope capable of strongly fixing an illumination lens to a distal end body while ensuring electrical insulation.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the distal end portion of the endoscope of the present invention is such that the surface of the distal end body is made of an electrically insulating synthetic resin material, and an illumination lens for expanding the distribution angle of illumination light is provided. At the distal end of the endoscope arranged on the surface of the main body, a cylindrical joining cylinder for attaching the illumination lens to the distal end main body is integrally molded with the illumination lens by a synthetic resin, and the joining is performed. It is characterized in that the cylinder for use is adhered and fixed to the synthetic resin portion of the body of the tip portion.

[0010]

【Example】

 An embodiment will be described with reference to the drawings. 2 is an external view of a distal end portion of an endoscope according to an embodiment of the present invention, and FIG. 1 is a side sectional view thereof. In the figure, reference numeral 1 is a tip body provided at the tip of the insertion portion, and a metal portion 1a made of stainless steel or the like for ensuring strength and an electric portion for ensuring electrical insulation from the outside. It is composed of an insulating synthetic resin material and a synthetic resin portion 1b formed on the front surface side of the tip body.

Reference numeral 2 is a known bending portion that can be bent in an arbitrary direction by remote control. Reference numeral 3 denotes a tip hood formed of an electrically insulating synthetic resin and screwed onto the outer periphery of the synthetic resin portion 1b of the tip portion main body 1.

In FIG. 2, 4 is an observation window, and 5 is a concave lens (hereinafter referred to as “illumination lens”) that constitutes the illumination window. 6 is a forceps channel, 7 and 8 are air supply nozzles and water supply nozzles for ejecting air or water toward the observation window 4, and 9 is a water ejection port for ejecting a fluid such as water straight at high speed.

As shown in FIG. 1, the tip body 1 has a through hole 10 penetrating the metal portion 1a and the synthetic resin portion 1b. Reference numeral 11 denotes a light guide, in which the end portion of the optical fiber bundle 11a is filled and fixed in a metal base 12 and an intermediate flexible portion is covered with an outer tube 13 made of, for example, silicon rubber. Then, the base 12 is fitted into the through hole 10 from the rear side, and is fixed to the metal portion 1a of the tip end body by, for example, a machine screw 14. It should be noted that the machine screw 14 may be replaced by an adhesive.

Reference numeral 25 denotes an illumination lens that is a concave lens for expanding the light distribution angle of the illumination light, and is disposed on the surface of the tip portion main body 1 so as to face the emission end surface 11 b of the light guide 11.

The illumination lens 25 is made of transparent plastic, and is integrally molded with the joining cylinder body 26 on one end side of a cylindrical joining cylinder body 26 for attaching the illumination lens 25 to the tip body 1. ing.

The outer peripheral surface of the joining cylinder 26 is coaxial with the through hole 10 and has a diameter larger than that of the through hole 10. The inner peripheral surface of the hole 5 is formed in the synthetic resin portion 1b of the tip body 1 by being recessed from the end surface side. The end face on the back side of the joining cylinder 26 is in contact with the bottom surface of the hole 5 in the synthetic resin portion 1b. In this way, the joining cylinder 26 is embedded in the hole 5 so that the surface of the illumination lens 25 comes to the position of the end surface of the synthetic resin portion 1b.

The tip of the light guide 11 passed through the through hole 10 is inserted to the rear surface of the illumination lens 25 inside the joining cylinder 26, and the outer peripheral surface of the joining cylinder 26 is A concave groove 27 for escape of the adhesive is formed.

Although the optical fiber bundle for illumination is used as the light guide in the embodiment of the present invention, other light guides or the like may be used.

[0019]

[Effect of device]

 According to the tip of the endoscope of the present invention, since the illumination lens is integrally molded with the joining cylinder with the synthetic resin and the joining cylinder is adhered to the synthetic resin portion of the tip body, the diameter of the illumination lens Can be adhered to the tip body in a watertight and strong manner without increasing the thickness of the tip or increasing the thickness of the tip, thus ensuring complete electrical insulation. Even if an impact is applied to the body of the unit, water leakage does not occur and it has an excellent effect of withstanding long-term use.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment.

FIG. 2 is an external perspective view of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tip body 1b Synthetic resin part 25 Illuminating lens 26 Joining cylinder

Claims (1)

[Scope of utility model registration request] 1. A distal end portion of an endoscope in which a surface of a distal end portion main body is formed of an electrically insulating synthetic resin material and an illumination lens for expanding a light distribution angle of illumination light is arranged on the surface of the distal end portion main body. A tubular joining cylinder for attaching the illumination lens to the tip body is integrally molded with the illumination lens by synthetic resin, and the joining cylinder is adhesively fixed to the synthetic resin portion of the tip body. The tip part of the endoscope characterized in that.