JPH0282934A - Length measuring device for endoscope - Google Patents

Abstract

PURPOSE:To ensure that the leading end part of a tube folded at the first and second slits returns to a straight state optionally and can be certainly pulled out of a forceps channel by stopping the leading end of a core wire at the position a little near the base part of the tube in the vicinity of the second slit by a core wire stopping means. CONSTITUTION:The leading end of an operating core wire 7 can be inserted up to the position between the leading end 1a and first slit 2 of a tube 1. When a rod 15 is pushed in the tube 1 in the direction of a guide pipe 17, the guide pin 16 of a core wire stopping means is stopped at the position brought into contact with the base end surface of the guide pipe 17 or colliding with the crank part 18a of a guide groove 18 and the leading end of the operating core wire 7 is present at the position near the base part of the tube in the vicinity of the second slit 6 and a traction wire 10 is delivered to the outside of the tube 1 by a length sufficient to make the leading end part of the tube 1 straight. Therefore, by merely pulling the tube 1 from a forceps channel in this state, the folded part of the leading end of the tube 1 is pulled out without hooking with the member on the side of an endoscope while naturally returns to a straight state along the forceps channel.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a length measuring tool for an endoscope, which is inserted into a forceps channel of an endoscope and used as a ruler to measure the dimensions of an affected area in a body cavity, etc. Regarding.

[Prior Art] In the past, this type of length measuring tool for an endoscope was one in which a scale member with a scale was bent and stretched in an L-shape. However, this type of device has a drawback that the scale member extends in one direction, so it cannot be used unless the scale member is protruded in a direction that is easy to observe within the field of view. Moreover, adjusting the direction of the protrusion was so difficult that it was practically impossible.

Therefore, conventionally, as shown in Japanese Utility Model Publication No. 62-23441, a pair of opening members that can be expanded in both directions by elastic force are provided inside the flexible tube so as to be able to move in and out, and a scale at a predetermined interval is placed between the opening members. A scale member was attached.

However, in such an endoscope length measurement tool, the direction (inclination) in which the scale member unfolds is determined, so as shown in FIG. When approaching from an oblique direction, there is a drawback that the dimensions of the affected area 62 cannot be accurately measured.

In addition, the opening member itself must have a firm and strong structure so that it can be opened reliably in both directions, and
When measuring length, the opening member that is closed inside the flexible tube must be pushed out remotely against its own elastic force, which often causes buckling of the operating wire or malfunction, making it difficult to use. was there. In addition, since the overall structure needs to be solid, manufacturing costs are high, making it extremely expensive to use as a measuring stick.

Therefore, the inventor developed a tube that can be inserted into and removed from the forceps channel of an endoscope, and a
A cut is provided to form the tube so that the tube can be bent and expanded at that part, and a scale is attached to a part on the distal side of the first cut to form a length measurement part, and a base part is formed from the first cut to the base part. Leave an interval shorter than the length of the measuring section above on the side.

A second slit is provided in the radial direction, and the tube is formed to be bendable and extensible at that part, and a flexible and small-diameter core wire is inserted into the tube from the base end side of the tube so as to be able to move forward and backward. Invented a length measuring tool for an endoscope in which the proximal end of the traction wire is locked, the traction wire is brought out of the tube through the second cut, and the tip of the traction wire is locked in the length measuring section. and filed a patent application (Patent Application 1986-1989).
No. 9193).

When inserting this endoscope length measuring tool into the endoscope's forceps channel, keep the tube straight over its entire length and insert the tip of the operating core wire between the tip of the tube and the first cut. Then, when measuring the length, pull the operating core wire toward the base, turn the tube 180 degrees at the first cut, and in this state insert the tube into the target affected area. Press. Then, the tube is bent at the second cut, and the length measuring part comes into close contact along the affected area, making it possible to measure the dimensions of the affected area.

[Problem 8 to be solved by the invention] The above-mentioned conventional length measuring tool for an endoscope does not have a means for regulating the movement of the operating core wire at an intermediate position. Therefore, when the length measuring tool is removed from the forceps channel after use, if the operating core wire is pushed toward the distal end in order to loosen the traction wire, the distal end 89 of the operating core wire 87 will be pushed as shown in FIG. The length measuring tool protrudes outside the tube 81 through the second cut 86. Therefore, when the length measuring tool is pulled in the direction of the arrow to remove it from the forceps channel 90, the length measuring tool gets caught in the opening of the forceps channel 90 and cannot be removed. Moreover, there is a drawback that the length measuring instrument may be damaged and the fragments may injure the inside of the patient's body cavity.

An object of the present invention is to eliminate such conventional drawbacks and provide a highly safe endoscope length measuring tool that ensures reliable removal from the forceps channel.

[Means for Solving the Problems] In order to achieve the above object, the length measuring tool for an endoscope of the present invention includes a tube that can be inserted into and removed from the forceps channel of an endoscope, with a distance from the tip thereof. A first cut is made in the radial direction, and the tube is formed to be bendable and extensible at that part, and
A scale is attached to a portion on the tip side of the first cut, and that portion is formed into a length measuring portion, and a scale is provided on the base side of the first cut with an interval shorter than the length of the length measuring portion. A second cut is provided in the direction so that the tube can be bent and expanded at that part, and a flexible and small-diameter traction wire is attached to the tip of the operating core wire that is inserted from the proximal end side of the tube so that it can move forward and backward into the tube. In the length measuring tool for an endoscope, the proximal end of the wire is locked, the pulling wire is brought out of the tube through the second cut, and the tip of the pulling wire is locked in the length measuring part, as described above. The tip of the operating core wire is formed so that it can be inserted between the tip of the tube and the first cut, and the tip of the operating core wire is positioned near the base of the second cut. The present invention is characterized in that a core wire stopping means for stopping the core wire is provided.

[Function] When inserting the length measuring tool into the forceps channel of the endoscope, insert the tip of the core wire for operation up to between the tip of the tube and the first cut. Since the operating core wire passes through the cuts, the tube is strong and can be easily inserted into the forceps channel without bending at each cut.

When the length measurement tool is removed from the forceps channel of the endoscope after the measurement, the tip of the core wire is stopped by the core wire stopper.
Stop at a position near the base of the cut. Then,
Because the steering core wire does not extend into each cut and the pull wire slackens long enough to straighten the tube at each cut, simply pulling the tube out of the forceps channel will remove the first and The tip of the tube bent at the second cut naturally returns to its straight state along the forceps channel and comes out.

[Example] Examples will be described with reference to the drawings.

FIG. 1 shows a length measuring tool for an endoscope according to a first embodiment of the present invention, in which 1 is a flexible tube made of, for example, tetrafluoroethylene resin, and has an outer diameter of, for example, 1.5 to 1.5 degrees. 2.51 snow,
A material with a wall thickness of about 0.2 to 0.5 mm is used.

A first cut 2 is cut in the tube 1 in the radial direction with a razor blade or the like at a distance ML from the tip 1a of the tube. The distance is, for example, about 10 to 50 square meters, and may be set to a length depending on the purpose of use.

The tube 1 is cut leaving a slight connecting allowance 2a at the first cut 2, and can freely bend and extend like a joint at this section.

A scale 4 is attached to a portion of the tube 1 on the distal side of the first cut 2, and this portion is formed as a length measuring portion 5 for measuring the dimensions of the affected area, etc. The scale 4 is, for example, a circumferential line painted on the outer periphery of the tube l, and is attached so as to divide the length measuring section 5 into three equal parts, for example. Of course, scale 4
may be provided at narrow or wide intervals depending on the purpose of use, and may be provided with scales of one different color.

A second cut 6 is cut in the radial direction of the tube l at a distance M from the first cut 2 on the proximal side of the first cut 2, and the tube 1 is formed to be bendable and extensible in this portion as well. has been done. This distance M should be shorter than the length of the length measuring section 5, and it is most preferable to set it to about half of L. In addition, in this embodiment, the second cut 6 is the same as the first cut 2.
The cut is made from 180 degrees in the opposite direction with a gap between the two.

The tip 1a of the tube and the corners of the outer periphery of each of the first and second cuts 2.6 are smooth rounded chamfers it,
It is formed in 2t and 6t.

An operating core wire 7 having approximately the same length as the tube 1 is inserted into the tube 1 from the proximal end tb side of the tube so as to be freely movable forward and backward. Although a stainless steel wire or a coil can be used as the operating core wire 7, using a single #a male optical fiber with a diameter of 0.2 to 1 layer will provide appropriate flexibility and ease of use. In this embodiment, a single fiber optical fiber coated with a synthetic resin tube having a wall thickness of about 0.1 mm is used, which has strength and does not easily bend.

An operating rod 15 is connected to the base end of the operating core wire 7 . This rod 15 protrudes from the tube 1 on the base side, and the protruding end of the rod 15 has an operating knob 8.
is installed.

A guide pin 16 is provided in the middle of the rod 15 in a protruding manner. Further, a guide groove 18 is formed along the axial direction in the guide tube 17 that is connected and attached to the proximal end portion 1b of the tube.
Near the base end of the guide tube 17, the guide groove 18 is bent into a crank shape. 18a is its crank portion.

The guide groove 18 is open at the base end of the guide tube 17, and the guide bottle 16 enters the guide fJ18 from there, and the guide groove 1 is opened.
8 can be slid along. When the guide bottle 16 is inserted into the innermost part of the guide groove 18, the tip of the operating core wire 7 is located at a position between the tip 1a of the tube and the first cut 2, as shown in FIG. will be inserted until In addition, the operating core is set so that the guide pin 16 is pulled out to the outside! ! When you pull 7 to the nearest side (to the right in the figure), as shown in Figure 3, the operating core wire 7
A stopper 9 made of a metal pipe fixed to the tip of the tube 1 is pulled out to a position where it collides with a constriction 13 formed in the tube 1. These are both ends of the movement range of the operating core wire 7.

Then, when the rod 15 is pushed in the direction of the guide tube F from the pulled out state, the guide pin L6 comes into contact with the base end surface of the guide tube 17 or the crank part of the guide groove 18, as shown in FIG. It stopped at the position where it hit 18a,
At this time, the tip of the operating core wire 7 comes to a position near the second cut 6 and closer to the proximal end. That is, core wire stopping means for stopping the tip of the operating core wire 7 at a position close to the proximal end of the second cut 6 is constituted by the guide bin 16, the guide groove 18, and the like. Also, when this condition occurs, the tube l
The traction wire 10 is extended out of the tube 1 for a sufficient length so that it is straightened at each cut 2.6.

Returning to FIG. 1, the stopper 9 is fixed to the distal end side of the operating core wire 7 by adhesive or caulking. Then, one end of the pulling wire IO made of a flexible and thin fishing line (hanging line) with a diameter of about 0.03 to 0°2 is connected to the operating core wire 7 on the proximal side (base side) of the stopper 9. tied together. Therefore, when the operating core wire 7 is pulled toward the proximal end, the knot 10a of the traction wire 10 is caught by the stopper 9, and the traction wire 10 is pulled in the same direction.

The traction wire IO is brought out of the tube 1 through the second cut 6. The tip of the pulling wire IO passes through a through hole 11 bored near the center of the length measuring section 5 at the tip of the tube, and is tied to a ring 12 for preventing removal within the length measuring section 5. Therefore, when the operating knob 8 is pulled on the base side, the traction wire 10 is pulled through the operating core wire 7.
The length measuring part 5 of the tube is pulled toward the second cut 6 by the pulling wire 10, and the first cut 2 and the second cut 6 are gradually bent. Then, when the length measuring section 5 is bent so as to be inverted exactly 180 degrees, the rear end of the stopper 9 collides with the constriction 13 formed in the tube l. Then, it becomes impossible to pull the operating core M7 any more.

21N to 4 illustrate the endoscope length measuring tool of the above embodiment according to the operating procedure. In addition, in these figures, the wall of the tube l is schematically shown by a line.

First, as shown in FIG. 2, the guide pin 16 is inserted into the guide groove 18 so that the tip of the operating core wire 7 is inserted to a position between the tip 1a of the tube and the first cut 2. Insert the tube as far as it will go. In this state, the operating core wire 7 has passed through the first and second cuts 2.6, so the tube l
is strong and does not bend at each cut 2.6. Therefore, in this state, this length measuring tool can be easily inserted into the forceps channel 30 of the endoscope. In this case, the tip 1a of the tube and the corners of the outer periphery of each of the first and second cuts 2.6 are all smooth chamfered parts it, 2t, S.
t, these parts can be smoothly inserted into and removed from the forceps channel 30, and will not be caught by members on the endoscope side.

When the tip of the endoscope length measuring tool is protruded from the tip 3 of the endoscope, pull the operation knob 8 on the proximal side all at once until the stopper 9 comes into contact with the constriction 13. Then, as shown in FIG. 3, the first cut 2 is bent by 180 degrees, and the 1tJ4 long portion 5 is turned backward by 180 degrees.

Next, from the state shown in FIG. 3, when the tip of the tube (first cut 2 in this case) is pressed against the target affected area 32, the tube passes through the second cut 6 as shown in FIG.
The tip of the tube is bent to form a T-shape. Therefore, the length measuring section 5 is always observed at the center of the field of view of the endoscope, and the size of the affected area can be read from the scale 4. When pressing the length measuring tool against the affected area 32 etc. in this way, the tip 1a of the tube and the corners of the outer periphery of each of the first and second cuts 2.6 are all smooth chamfered parts it, 2t, 6t.
, so it will not damage the mucosal surface.

In addition, if the tube l approaches the affected area from an oblique direction, as shown by the two-dot chain line in Fig. 4,
Simply press the tip of the tube against the target affected area.
The second cut 6 is made so that the length measuring part 5 is in close contact with the affected area.
is bent. Therefore, no matter which direction the tube approaches the affected area, the length measurement unit 5 can be brought into close contact with the affected area and the length can be easily measured at the center of the field of view.

FIG. 5 shows the first cut 22 and the second cut 26 at 9
This figure shows the state in which the second embodiment is used, which is formed by cutting from the direction of 0 degrees. In this case, since the length measuring section 5 is bent in parallel to the side of the tube 1, the scale can be more easily recognized visually.

In actual use, even if the first cut 2 and the second cut 6 are formed by cutting from 180 degrees in different directions as in the first embodiment, By pressing the tube 1 slightly strongly against the affected area, the second cut 6 is twisted, so that the length measuring section 5 is lined up on the side of the tube, resulting in the same condition as shown in FIG. 5. Therefore, the first and second cuts may be formed in substantially any direction, and preferably, the first and second cuts may be in different directions.

FIG. 6 shows a state in which the endoscope length measuring tool of the present invention is removed from the forceps channel of the endoscope. At this time, when the rod 15 is pushed in the direction of the guide tube 17, the guide pin 16 comes into contact with the base end surface of the guide tube 17, as shown in FIG. 6, or hits the crank part 18a of the guide groove 18. Stop at a position. At this time, the tip of the operating core wire 7 is located near the proximal end of the second cut 6, and the traction wire 1O is inserted into the tube 1 by a length sufficient to make the tip of the tube 1 straight. being pushed outside.

Therefore, by simply pulling out the tube l from the forceps channel in this state, the bent part at the tip of the tube will return to its straight state naturally along the forceps channel without getting caught by any components on the endoscope side. .

[Effects of the Invention] According to the endoscope length measuring tool of the present invention, even when approaching the target affected area from an oblique direction, the length measuring part can be easily brought into close contact with the target area. In addition to having the excellent effect of being able to measure dimensions at the center of the field of view, when removing the length measuring tool from the forceps channel, place the tip of the operating core wire on the proximal side near the second cut. Since the tube can be stopped at the closest point, the tube will naturally straighten along the forceps channel and be removed reliably, which is an excellent feature that can prevent damage to the length measuring tool and personal injury. It has a great effect.

[Brief explanation of the drawing]

FIG. 1 is a partially cut away perspective view of a first embodiment of the present invention, FIGS. 2 to 4 are partial side views showing the state of use of the embodiment, and FIG. 5 is a perspective view of the first embodiment of the present invention. A partial perspective view of the second embodiment, FIG. 6 is a side view showing the state in which the length measuring tool is removed from the forceps channel of the endoscope, and FIG. 7 shows the state in which the conventional length measuring tool for an endoscope is used. The partial side view shown in FIG. 8 is a schematic view showing the usage state of the endoscope length measuring tool for which the inventor previously applied for a patent. l...tube, 1t...chamfered part, 2.22...
・First cut, 2t... chamfer, 4... scale,
5... Length measuring part, 6.26... Second cut, 6t.
... Chamfered portion, 7... Core wire for operation, 9... Stopper, 10... Traction wire, 15... Rod, 16...
・Guide pin, 17... Guide tube, 18... Guide groove, 1
8a...Crank part. Agent Patent Attorney Kazuhiko Mitsui Figure 7 Figure 8R Figure 6 Figure 5 Incho 1 11:Sa

Claims (1)

[Scope of Claims] A tube that can be inserted into and removed from a forceps channel of an endoscope is provided with a first cut in the radial direction at a distance from the distal end thereof, and the tube is formed to be bendable and extensible at that portion, and A scale is attached to a portion on the tip side of the first cut, and that portion is formed into a length measuring portion, and a scale is provided on the base side of the first cut with an interval shorter than the length of the length measuring portion. A second cut is provided in the direction so that the tube can be bent and expanded at that part, and a flexible and small-diameter traction wire is attached to the tip of the operating core wire that is inserted from the proximal end side of the tube so that it can move forward and backward into the tube. In the length measuring tool for an endoscope, the proximal end of the wire is locked, the pulling wire is brought out of the tube through the second cut, and the tip of the pulling wire is locked in the length measuring part, as described above. Connect the tip of the operating core wire to the tip of the tube and the first tube.
The core wire is formed so that it can be inserted between the above-mentioned second cut, and is provided with a core wire stopping means for stopping the tip of the core wire for operation at a position close to the base near the second cut. Length measurement tool for endoscopy.