JP3331059B2 - Rigid endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid endoscope having a rigid insertion portion having a curved portion near the distal end thereof, and observing the front of the insertion portion.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional rigid endoscope.
A rigid insertion portion 100 formed by bending the vicinity of the distal end portion
An observation window 101 for observing the front,
A treatment tool projection port 102 for projecting the treatment tool 200 forward is provided.

[0003] Reference numeral 103 denotes a relay optical system for transmitting an observation light image incident from an observation window 101, and reference numeral 104 denotes a treatment provided in communication with a treatment tool projection 102 for inserting a treatment tool 200. It is a tool insertion channel.

[0004] As shown in FIG. 7, in a conventional rigid endoscope, a treatment tool outlet 102 is provided with an observation window 101.
Is arranged on the outer peripheral side of the curve of the insertion portion 100.

[0005]

As shown in FIG. 7, a treatment tool protrusion path 105 communicating with the treatment tool protrusion port 102 immediately behind the treatment tool protrusion port 102 approaches the observation optical axis A in front of the observation window 101. It is provided so as to be inclined. Therefore, if the treatment tools 200 are protruded along it, the distal end of the treatment tools 200 is protruded toward the vicinity of the center of the observation visual field as shown by the broken line.

[0006] However, the treatment tool protruding port 102 is not connected to the observation window 1.
Since the distal end of the treatment tool 200 is disposed on the outer peripheral side of the curve of the insertion portion 100 with respect to the insertion portion 01, the distal end of the treatment tool 200 tends to return straight after passing through the curved portion, as shown by a solid line due to the resiliency of its own shaft. In addition, it shifts outward by an amount corresponding to the insertion play in the vicinity of the treatment tool protrusion path 105 and moves away from the center of the observation visual field.

As a result, even if the endoscope is guided so that the target affected part is located at the center of the observation visual field, the target affected part can be treated with the treatment tools 20.
Since there is no sniper at 0, there is a disadvantage that it takes a very long time to guide the endoscope when performing the treatment.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rigid endoscope in which a treatment tool is reliably projected to the center of an observation field so that a target affected part can be easily aimed at.

[0009]

In order to achieve the above object, a rigid endoscope according to the present invention has a rigid insertion portion having a curved portion near the distal end, and the distal end face of the inserted portion has a forward end. In a rigid endoscope provided with an observation window for observing, and a treatment tool projection for projecting the treatment tool forward,
The treatment tool projecting port is arranged on an inner peripheral side of a curve of the insertion portion with respect to the observation window.

The treatment tool projecting path communicating with the treatment tool projecting port immediately behind the treatment tool projecting port is provided so that an extension of the axis thereof is inclined in front of the observation window so as to intersect the observation optical axis. Good to be.

[0011]

An embodiment will be described with reference to the drawings. FIG.
1 shows a rigid endoscope according to an embodiment of the present invention, in which an insertion portion 1 formed in an elongated tubular shape having a circular cross section is formed such that a front half portion thereof is largely curved to about 70 to 80 degrees. ing. Since the insertion portion 1 is not flexible, its curved shape is always maintained.

The proximal end of the insertion section 1 is connected to the proximal body 6. The hand-held side body 6 has a grip portion 2 for grasping and supporting with a hand, an eyepiece portion 3 for viewing an observation image transmitted through the inside of the insertion portion 1, and a protrusion from the tip of the insertion portion 1. Treatment tool insertion base 4 for sending treatment tools to be
And a flexible light guide tube 5 for transmitting illumination light.

As shown in FIG. 3 showing an enlarged cross section taken along the line III-III, the flexible light guide tube 5 protrudes laterally from the proximal body 6 and includes a light guide fiber bundle (light) for illumination. 3 (not shown in FIG. 3).
Reference numeral 7 denotes a breaking rubber for preventing the base end of the light guide flexible tube 5 from being sharply bent.

As shown in FIG. 2, the grip portion 2 is detachably attached to the hand side main body 6 from a slightly diagonally rearward downward direction. Reference numeral 10 denotes a metal mounting seat fixed to the hand side body 6 with screws, and a protruding portion formed on the mounting seat 10 is fitted into a concave portion formed on the grip portion 2.

Then, as shown in FIG. 2, a fixing pin 11 having a protruding head is inserted into the mounting seat 10 and the grip portion 2 so as to straddle the through-hole that is formed in a straight line. Are connected to the mounting seat 10.

The distal end portion of the fixing pin 11 is screwed into a female screw formed on the grip portion 2. When the fixing pin 11 is tightened, the grip portion 2 is firmly fixed to the mounting seat 10. When the fixing pin 11 is loosened, the grip portion 2 can be removed from the main body 6 at the hand side.

As shown in FIG. 3, the proximal end of the flexible light guide tube 5 is fixed to the main body 6 via a connecting tube 12, and the right and left openings of the main body 6 have lids. 13,
14 are attached. The treatment tool insertion base 4 is directly attached to the hand side main body 6 and fixed by screws.

An O-ring for sealing is mounted on a boundary surface between the parts facing the outside so that water does not enter the inside. Each O-ring is shown in a cross-sectional shape in a natural state before being mounted, and the reference numeral is omitted for each O-ring (the same applies hereinafter).

FIG. 4 shows the distal end surface of the insertion section 1. The observation window 17 is located above the center, that is, on the outer peripheral side of the curve of the insertion section 1.
Is disposed, and a treatment tool projecting port 19 is provided on the lower side of the central portion, that is, on the inner peripheral side of the curve of the insertion section 1. Reference numeral 18 denotes an illumination window, on the back side of which an emission end of the light guide fiber bundle is arranged.

As shown in FIG. 1, an objective optical system 20 is disposed in the observation window 17, and an observation image of a subject in front of the insertion section 1 obtained by the objective optical system 20 is inserted into the insertion section 1.
Optical system 21 for transmitting light from the distal end to the proximal end
Are supported in the lens frame 22 and arranged in the insertion section 1.

The lens frame 22 is an elongated rigid body formed of a hard metal pipe such as brass, for example, and is formed of different parts from the curved portion at the front half and the straight portion at the base half. The two parts are integrally connected by soldering or the like, and are arranged at a position closer to the outer peripheral side of the curve of the insertion portion 1.

The relay optical system 21 includes a number of lenses for transmitting an observation image and a prism for changing the direction of the optical axis in accordance with the curved shape of the lens frame 22. Each optical member is a mirror. It is adhesively fixed in the frame 22.

In the insertion portion 1, the base end side is connected to the treatment tool insertion base 4 and the distal end side is connected to the treatment tool projection opening 19.
A treatment tool insertion channel 24 made of, for example, a fluororesin tube is connected to the inside of the insertion section 1 in parallel with the lens frame 22 over the entire length at a position closer to the inner peripheral side of the curve of the insertion section 1. Light guide fiber bundles, not shown in FIG. 1, are also arranged parallel to it.

The insertion section 1 is covered with a flexible outer tube 30. The outer tube 30 is formed by covering the outer periphery of a metal inner and outer double spiral tube with a mesh tube, and further covering the outer periphery with a flexible polyurethane resin tube or the like.

Since such a mantle tube 30 is flexible by itself, it can be easily assembled so as to cover the insertion portion 1, but a rigid built-in member such as the lens frame 22 is inserted inside. Then, the insertion part 1 can be freely moved only by a small gap with the built-in part, and the insertion part 1 becomes rigid as a whole.

As shown in FIG. 1 and FIG. 5 showing a cross section taken along the line V--V, a lens frame 22 and treatment tool insertion channels 24 and Each end of the light guide fiber bundle 27 is inserted and fixed from the rear.

The distal end portion of the mantle tube 30 is fixed to a metal connecting ring 37, and the connecting ring 37 is screwed and fixed to the distal end body 36 as shown in FIG. .

A metal tip cover 38 having a tapered outer diameter gradually narrowing toward the front side is screwed to the outer periphery of the connection ring 37 to surround the periphery of the tip of the insertion portion 1. In. An O for sealing is provided on the inner surface side of the tip cover 38.
A ring is attached.

A treatment tool protruding passage 25 is formed in the distal end main body 36 so as to penetrate therethrough immediately after the treatment tool protruding opening 19. Beside
The distal end of the treatment tool insertion channel 24 is inserted and fixed. As shown in FIG. 1, the treatment tool protruding path 25 is formed so as to be inclined such that an extension of its axis intersects the observation optical axis A in front of the observation window 17.

The treatment instrument insertion base 4 is fixed to the upper surface of the rear half of the proximal body 6 so as to project obliquely rearward.
The proximal end of the treatment tool insertion channel 24 and the treatment tool insertion base 4 are connected to each other by a metal connection pipe 50 disposed in the hand side main body 6.

However, since the treatment tool insertion channel 24 is located in the lower half of the insertion section 1 and the treatment instrument insertion base 4 is located on the upper surface of the proximal body 6, as shown in FIGS. The connection pipe 50 is disposed so as to be smoothly bent in the proximal body 6 so as to avoid interference with the lens frame 22.

The connection pipe 50 is fixed to the treatment tool insertion base 4 by silver brazing or the like, and the connection with the treatment tool insertion channel 24 is tightly bound by a metal wire. An exposed portion of the connection pipe 50 in the proximal body 6 is covered with an electrically insulating tube.

At the front and rear of the hand side main body 6, there are provided a metal insertion part connecting cylinder 41 for connecting the insertion part 1 and a metal eyepiece connecting cylinder 42 for connecting the eyepiece 3. The projection is fixed in the optical axis direction. An O-ring for sealing is mounted on each of the fitting portions.

In the vicinity of the protruding end of the insertion portion connecting tube 41, a metal base end cap 43 water-tightly mounted on the base end side of the flexible tube 30 is fixed by a sharp screw. The periphery of the connecting portion is surrounded by a base end cover 44 screwed to the outer periphery of the insertion portion connecting tube 41. Inside the base end cover 44, a seal is provided to prevent water from entering the connecting portion by the sharp screw. O-ring is mounted.

In the middle portion of the insertion portion connecting tube 41, VI-VI
As shown in FIG. 6 showing a cross section, a hole 46 for passing the lens frame 22, a hole 47 for passing a connection pipe 50 connected to the proximal end of the treatment tool insertion channel 24, and a light guide fiber bundle. A hole 48 for passing 27 is formed.

As shown in FIG. 6, a hole 46 for passing the lens frame 22 is formed to be slightly thicker than the diameter of the lens frame 22, and a small screw disposed toward the center of the hole 46 from three directions. The slightly thinner end of 53 is in contact with the surface of the lens frame 22. On the lens frame 22 side, a groove into which the tip of the small screw 53 is fitted is formed.

Therefore, by adjusting the tightening of the three small screws 53, the axial position of the lens frame 22 can be shifted, and the relay optical system 21 built in the lens frame 22 and the eyepiece 3 can be built in. It is possible to make a rough adjustment of optical axis alignment with the eyepiece optical system. In addition, the rotation of the lens frame 22 is restricted by fitting the tip of the small screw 53 into the groove on the outer periphery of the lens frame 22.

In the rigid endoscope thus configured, the treatment tool insertion channel 4 is connected to the treatment tool insertion channel 2.
When the treatment tool 200 is inserted into the inside 4 and the distal end of the treatment tool 200 is projected forward from the treatment tool projection opening 19 as shown in FIG. Due to the resiliency of its own shaft, which tries to return straight after partial passage, it tilts by the amount of the backlash near the treatment tool protruding path 25.

Then, in the present invention, since the treatment tool projecting port 19 is located inside the curve of the insertion portion 1 with respect to the observation window 17, the distal end of the treatment tool 200 approaches the observation optical axis A in front. Tilted to the right side, and as a result, it is observed in the center of the observation field.

In the above embodiment, the treatment tool projecting path 25
Is inclined in the direction approaching the observation optical axis A in the front, so that the distal end of the treatment tool 200 reaches the position of the observation optical axis A closer and is observed at the center position of the observation screen. .

[0041]

According to the present invention, since the treatment tool projecting port is disposed on the inner peripheral side of the curved portion of the insertion portion with respect to the observation window, the distal end of the treatment tool projects from the treatment tool projecting port. The tip of the treatment tool is tilted in the direction approaching the observation optical axis due to the resiliency of its own shaft, which tries to return straight after passing through the curved portion of the insertion portion, and as a result, the tip of the treatment tool is observed. Observed at the center of the screen.

Further, the axis of the treatment tool protruding path communicating with the rear side of the treatment tool protruding opening is inclined in front of the observation window so as to approach the observation optical axis. Reaches the observation optical axis closer and is observed at the center position of the observation screen.

[Brief description of the drawings]

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

FIG. 2 is a side view of the embodiment.

FIG. 3 is a sectional view taken along line III-III of the embodiment.

FIG. 4 is a front view of the distal end surface of the insertion section according to the embodiment.

FIG. 5 is a sectional view taken along line VV of the embodiment.

FIG. 6 is a sectional view taken along line VI-VI of the embodiment.

FIG. 7 is a partial side sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insertion part 17 Observation window 19 Treatment tool protruding opening 24 Treatment tool insertion channel 25 Treatment tool protruding path 200 Treatment tool

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-304121 (JP, A) JP-A-63-250617 (JP, A) JP-A-6-54799 (JP, A) JP-A-5-54799 305051 (JP, A) Fully open sho 59-48605 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61B 1/00-1/32

Claims (2)

(57) [Claims] 1. A distal end portion having a curved rigid insertion portion, a distal end surface of the insertion portion, an observation window for observing the front, and a treatment for projecting a treatment instrument forward. A rigid endoscope provided with a tool outlet, wherein the treatment tool outlet is arranged on the inner peripheral side of a curve of the insertion portion with respect to the observation window. 2. A treatment tool projecting passage communicating with the treatment instrument projecting port immediately behind the treatment tool projecting port is provided so that an extension of an axis thereof intersects an observation optical axis in front of the observation window. The rigid endoscope according to claim 1.