JP3033984B2 - Endoscope treatment tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used by being inserted into a treatment tool insertion passage of a so-called ultrasonic endoscope which can perform ultrasonic scanning and optical observation in combination. Endoscope treatment tool to be used.

[Conventional technology]

In FIG. 9, reference numeral 81 denotes a distal end main body of the ultrasonic endoscope;
a is an ultrasonic scanning range by the ultrasonic probe 82, and 83a is an optical observation range from the observation window 83.

Reference numeral 84 denotes a treatment tool insertion passage formed in the distal end main body 81 for inserting the treatment tool 90, and the distal end 90a of the flexible straight treatment tool 90 is guided near the center of the ultrasonic scanning range 82a. It is supposed to be.

[Problems to be solved by the invention]

However, there is a deviation between the scanning range 82a by the ultrasonic probe and the optical observation range 83a from the observation window. Therefore, as shown in, for example, FIG. 10, the distal end 90a of the treatment tool guided near the center of the ultrasonic scanning range appears far away from the center in the optical observation surfaces 100.

For this reason, it is difficult to clearly observe the affected part to be treated by the treatment tool 90 with the naked eye, and there is a disadvantage that the endoscopic treatment cannot always be performed accurately.

An object of the present invention is to solve such conventional drawbacks and to provide an endoscope treatment tool capable of performing an endoscopic treatment accurately and safely near the center of an optical observation visual field. I do.

[Means for solving the problem]

In order to achieve the above object, the endoscope treatment instrument of the present invention is so arranged that when a flexible straight treatment instrument is inserted, its distal end is guided near the center of the ultrasonic scanning range. An endoscope treatment tool inserted into a treatment tool insertion passage formed by curving the insertion portion tip of an acoustic endoscope, wherein when the treatment tool insertion passage is inserted, the tip is optically observed. It is characterized by having a flexible shaft curved toward the center of the range.

[Action]

When the treatment instrument for an endoscope is inserted into the treatment instrument insertion passage of the ultrasonic endoscope, the curve formed on the shaft of the treatment instrument for the endoscope follows the curve formed on the treatment instrument insertion passage, and the endoscope is moved. The distal end of the treatment instrument protrudes near the center of the optical observation range.

〔Example〕

 Embodiments will be described with reference to the drawings.

FIG. 1 shows the distal end of the insertion portion of the ultrasonic endoscope. A distal end main body 2 is connected to a distal end of a bending portion 1 which is formed to be freely bendable by remote control on a distal end portion of a flexible tube forming an insertion portion, and the distal end main body 2 transmits and receives ultrasonic waves. An ultrasonic probe 3 for scanning and an objective lens window (observation window) 4 of an observation optical system for performing optical observation are provided side by side. 5 is a balloon which is filled with liquid and inflated.

Therefore, an ultrasonic tomographic image of the ultrasonic scanning range 3a can be obtained by the ultrasonic probe 3, and the optical image of the optical observation range 4a can be observed through the observation window 4.

Reference numeral 10 denotes a treatment instrument insertion passage for inserting and guiding an endoscope treatment instrument 30 such as a biopsy forceps, and is shown in detail in FIGS. 2 to 5.

As shown in FIG. 2, a forceps insertion hole 11 is formed in the distal end body 2 obliquely toward the center of the ultrasonic scanning range 3a, and a treatment comprising a flexible tube is provided at the rear end. A connecting pipe 13 formed in a curved shape for connecting the tool insertion channels 12 is fixed. Reference numeral 14 denotes a connecting pipe fixedly connected to smoothly connect the inner wall of the forceps insertion hole 11 and the inner wall of the connecting pipe 13.

In this manner, the treatment tool insertion passage 10 is
1, formed by the connecting pipe 14, the connecting pipe 13, and the treatment tool insertion channel 12, and shown in FIGS. 3, 4, and 5, the width of each part of the treatment tool insertion passage 10 before and after the curved portion. a, b and c are formed to have substantially the same dimensions.

FIG. 6 shows a treatment instrument inserted into the treatment instrument insertion passage 10 described above.
30 is shown.

The distal treatment section 31 of the treatment instrument 30 is, for example, a biopsy forceps cup, and is opened and closed by remote operation from the operation section 32.
The outer diameter of the distal treatment section 31 is freely insertable into the treatment instrument insertion passage 10, but is different from the width a, b, c of each part of the treatment instrument insertion passage 10 formed to the same size as described above. It is formed in a marginal outer dimension that hardly causes a gap therebetween.

The distal treatment section 31 and the operation section 32 are connected by a flexible shaft 33.
Only 33a has the same thickness as the distal treatment section 31, and the other portion 33b has a smaller outer diameter than that.

FIGS. 7 and 8 show an example of the structure of such a shaft 33. FIG. 7 shows a structure in which a tightly wound coil 33b having a small outer diameter and a densely wound coil 33a having a large outside diameter are connected to a pipe 33c. Connected through. FIG. 8 shows that the heat-shrinkable tube 33a is coated only on the tip portion of the thin densely wound coil 33b.

As shown in FIG. 6, the tip end side (thick portion) 33a of the shaft is curved and formed. As a result, when this treatment tool 30 is inserted into the treatment tool insertion passage 10 of the ultrasonic endoscope, as shown in FIG.
The distal treatment section 31 is guided so as to protrude near the center of the optical observation range 4a so that the curved portion 33a of the shaft of the treatment instrument 30 follows the curve of the treatment instrument insertion passage 10. Since this position is also included in the ultrasonic operation range 3a, the distal treatment section 31 appears in the ultrasonic tomographic image.

In this case, no matter what direction the treatment tool 30 is inserted into the treatment tool insertion passage 10, if the distal end shaft 33a of the treatment tool 30 is located at the curved portion of the treatment tool insertion passage 10, The direction of the treatment tool 10 is naturally corrected in a certain direction so that the curve of the shaft 33a follows the curve of the treatment tool insertion passage 10.

In addition, the distal end shaft 33a of the treatment instrument has little clearance with respect to the widths a, b, and c before and after the curve of the treatment instrument insertion passage 10, so that the protruding distal treatment portion 31 is almost left and right. It does not fluctuate and projects accurately near the center of the optical observation range 4a.

〔The invention's effect〕

According to the treatment tool for an endoscope of the present invention, the distal end of the treatment tool is
Since it can be directed to the vicinity of the center of the optical observation range of the ultrasonic endoscope, there is an excellent effect that the endoscopic treatment can be performed accurately and safely while clearly observing with the naked eye.

[Brief description of the drawings]

FIG. 1 is a side view showing a part of the distal end of the insertion portion of the ultrasonic endoscope of the embodiment in section, FIG. 2 is a partially enlarged sectional view of FIG. 1, FIG. 4 is a sectional view taken along line IV-IV, FIG. 5 is a sectional view taken along line VV, FIG. 6 is a side view of the treatment tool for an endoscope of the embodiment, and FIG. FIG. 8 is a partial side sectional view showing another example of the shaft of the treatment instrument. FIG. 9 is a sectional view showing a part of the distal end of an insertion portion of a conventional ultrasonic endoscope. FIG. 10 is a schematic view of the observation screen. 2... Tip body, 10... Treatment tool insertion passage, 30... Treatment tool, 33... Shaft, 33 a.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61B 17/00-17/39 A61B 8/12 A61B 1/00 G01N 29/06

Claims (1)

(57) [Claims] 1. An ultrasonic endoscope is formed so as to be curved at a distal end of an insertion portion of an ultrasonic endoscope such that when a flexible straight instrument is inserted, the distal end is guided near the center of an ultrasonic scanning range. An endoscope treatment tool having a flexible shaft, which is inserted into the treatment instrument insertion passage, wherein a distal end portion of the flexible shaft passing through the curved portion has a play with respect to the curved portion. It is formed in an outer diameter dimension that does not cause sticking, and is formed by being curved in advance toward the vicinity of the center of the optical observation range of the ultrasonic endoscope, and the other portion of the flexible shaft is An endoscope treatment tool characterized by being formed thinner than a distal end portion.