JPH065763Y2 - Catheter type fiberscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a catheter-type fiberscope.

[Conventional technology]

In general, it is said that this type of fiberscope is preferable as the insertion portion has a smaller diameter in order to facilitate insertion into a thin blood vessel or the like. Then, with the distal end portion as a curved portion, the distal end portion is rotated by rotation from the proximal end portion to change the observation visual field.

[Problems to be solved by the device]

Conventionally, the insertion portion of this type of catheter-type fiberscope is such that the image guide and the light guide are inserted into the outer sheath made of plastic, and
If it has a small diameter, it may buckle in the middle of insertion into the living body and it may be difficult to reach the target reaching position.Also, when changing the observation field of view, rotate the insertion part from the proximal end side. If this is done, there is a risk that the rotation will not be transmitted to the tip and may be twisted in the middle.

In view of this, the present invention provides a catheter-type fiberscope in which the tip portion can be reliably and easily inserted into a living body, and the tip portion can be reliably rotated by a rotating operation at hand. With the goal.

[Means for Solving the Problems]

In order to achieve the above object, a catheter-type fiberscope of the present invention is a catheter-type fiberscope including a thin tube into which an image guide and a light guide are inserted. The base end portion is a stainless tube having an outer diameter of 0.5 mm or less, and the base end portion of a plastic thin tubular main body portion having an outer diameter dimension smaller than the outer diameter dimension of the stainless steel tube is While inserting and fixing to the tip of the stainless steel tube, from the middle part to the base end side of the main body portion, in the plastic outer layer portion having an outer diameter dimension smaller than the outer diameter dimension of the stainless steel tube, Further, the probe is provided with a bending habit by applying a bending habit to the tip of the main body, and the image guide / objective lens and the light are provided on the main body. Ido the only one in which the interior.

[Action]

The middle part to the base end of the small-diameter tube is a stainless steel tube, and the outer layer covers the middle part to the base end side of the main body, so that blood vessels, ureters, fallopian tubes, etc. of the living body When inserting into the tube to be inserted, the intermediate part to the base end part does not buckle and can be inserted reliably. Since only the image guide / objective lens and the light guide are installed in the main body at the tip of the small diameter tube, the outer diameter of the main body can be made extremely small. Also,
If the base end is rotated around the axis, the rotation can be reliably transmitted to the middle part of the small diameter tube by the stainless steel tube, and the outer layer part from the middle part of the main part to the base end side The rotation can be reliably transmitted to the tip of the part. By rotating in this manner, the orientation of the bending-prone probe at the tip of the main body can be changed, and the probe can be inserted along the curve of a blood vessel or the like.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 shows a catheter-type fiberscope according to the present invention, which comprises a thin tube 3 into which an image guide 1 and a light guide 2 (see FIG. 3) are inserted. , Directly into a tube to be inserted such as a blood vessel, ureter, oviduct of a living body, or inserted into a guide lumen of a catheter to be inserted into the tube to be inserted or into the tube to be inserted. Observe the inside of various organs.

Then, in FIGS. 1 and 2, the intermediate portion 4 of the small diameter tube 3
The base portion 5 is a flexible stainless tube 6 having an outer diameter A of 0.5 mm or less.

In addition, the tip portion 7 of the small-diameter tube 3 is connected to the plastic tube 8
And Specifically, the base end portion 10a of the plastic thin tubular body portion 10 having the outer diameter dimension C smaller than the outer diameter dimension A of the stainless steel tube 6 is inserted into the tip of the stainless steel tube 6 and fixed thereto. Further, from the midway portion to the base end side of the main body portion 10 is made of plastic having an outer diameter dimension B smaller than the outer diameter dimension A of the stainless steel tube 6 and larger than the outer diameter dimension C of the main body portion 10. The outer layer portion 11 covers. Further, a bending tendency is imparted to the tip of the main body section 10 to form a bending tendency probe section 9, and only the image guide 1, the objective lens 19 and the light guide 2 are incorporated in the main body section 10.

In this case, the main body portion 10 and the outer layer portion 11 are adhered with an adhesive agent, and the base end portion 10a of the main body portion 10 and the stainless steel tube 6 are adhered with an adhesive agent S.

A marker 12 is attached to the bending-prone probe 9. Here, the marker 12 is made of a mixture of gold powder and epoxy resin, and has a maximum diameter dimension of 0.5 mm or less. The weight ratio of the gold powder and the epoxy resin is (3: 1) to (10: 1), and the marker 12 has a specific gravity of about 10 and is radiopaque. In this case, gold powder is 20 (millimeter micro) to 30 (millimeter micro)
Are preferred.

Thus, in the embodiment, the stainless steel tube 6
Has an outer diameter A of 0.5 mm, an inner diameter of 0.4 mm, and a length of 1300 mm. The outer layer portion 11 of the plastic tube 8 has an outer diameter B of 0.41 mm, an inner diameter of 0.38 mm, and a length of 100 mm.
The outer diameter C of the main body 10 is 0.37 mm, the inner diameter is 0.34 mm, and the exposed length exposed from the outer layer 11 is
It is set to 100 mm. The length dimension of the plastic tube 8 (that is, the length dimension from the tip of the stainless steel tube 6 to the tip of the main body 10) is preferably 100 mm to 300 mm.

The bending tendency of the probe 9 of the plastic tube 8 is given by heat treatment, and is performed by heating to the softening temperature of the plastic. Then, the probe portion 9 to which the bending tendency is given becomes linear or further curved when an external force is applied, but in the free state, it is curved with a predetermined radius of curvature.

Here, the image guide 1 is, as shown in FIG. 3, composed of a glass portion 13 including a large number of pixels each having a core and a clad, and a coating layer 14 coating the glass portion 13.
An objective lens 19 is continuously provided at the tip to form a tip objective portion. The light guide 2 is composed of a large number of element wires 15 ... Having a core and a clad.

As shown in FIG. 1, the small-diameter pipe 3 is connected to the connecting pipe 17 via the connecting portion 16, and the connecting pipe 17 is connected to the tubes 20 and 21 via the branching portion 18. There is. The image guide 1 and the light guide 2 are inserted into the connecting pipe 17 via the connecting portion 16, and the image guide 1 is inserted into the tube 20 via the branching portion 18, and the light guide 2 is inserted.
Is inserted into the tube 21 via the branch portion 18.

The image guide 1 is connected to the ITV camera device, and the light guide 2 is connected to the light source device.

With this catheter fiberscope, a small-diameter tube can be used to observe an inspected part such as a blood vessel, trachea, fallopian tube, or ureter, or a part of an organ such as the heart that is continuous with the inserted tube. 3 into the tube to be inserted (in this case, the thin tube 3 may be directly inserted into the tube to be inserted or may be freely inserted into the guide lumen of the catheter inserted into the tube 3). , An illumination light is radiated to the observed portion through the light guide 2, and the image of the observed portion reflected by the observed portion is made incident on the image guide 1 through the objective lens 19 to produce the ITV. It is transmitted to the camera device and the observed region is observed.

In this case, when inserting the small-diameter tube 3 into the tube to be inserted, the stainless steel tube 6
Therefore, it can withstand a sufficient pushing force, and can be securely inserted to the target site (observed site) without buckling. Further, in this case, since the probe 9 is provided with the X-ray opaque marker 12, if the X-ray is irradiated, the position of the tip of the small diameter tube (that is, the position of the tip objective portion) is confirmed. It can be inserted while.

Then, when it is desired to change the field of view during observation, if the small diameter tube 3 is rotated at the proximal end portion 5, the rotation is surely transmitted to the intermediate portion 4 of the small diameter tube 3, and Is transmitted from the intermediate portion 4 to the plastic tube 8 of the tip portion 7, the tip of the small diameter tube 3 is rotated, and the position of the tip objective portion is changed to change the observation field of view. In this case, since the plastic tube 8 forms the distal end portion 7 of the small-diameter tube 3, the length dimension thereof is 1 / the longest of the total length of the small-diameter tube 3.
It is 3 or less, does not become large, and is not twisted in the middle, so that the tip objective portion reliably rotates.

The present invention is not limited to the above-mentioned embodiment, and the design can be freely changed without departing from the gist of the present invention. For example, the length dimension of the small diameter tube 3 can be freely changed.

[Effect of device]

The present invention has the following remarkable effects with the above configuration.

The tip portion 7 of the small-diameter tube 3 is further provided with two stages (outer layer portion) than the intermediate portion 4 to the base end portion 5 whose outer diameter dimension A is 0.5 mm or less.
11 and the main body portion 10) and can be made thin toward the distal end side, and the torque property that can reliably transmit the rotation of the proximal end portion 5 of the small-diameter tube 3 to the distal end of the main body portion 10, and the It is possible to have both flexibility capable of accommodating the bending of the inserted tube and buckling resistance at the time of insertion into the inserted tube. Furthermore, the main body 10
Although the tube is extremely thin, due to the rotation of the thin tube 3,
The direction of the bending-prone probe 9 at the tip of the main body 10 can be changed, and the probe can be smoothly inserted along the curve of the inserted tube. Therefore, it can be optimal for observation of an extremely thin inserted tube such as a blood vessel, trachea, oviduct, or ureter of a living body.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of the present invention, FIG. 2 is an enlarged vertical sectional view of an essential part, and FIG. 3 is an enlarged sectional view taken along line XX of FIG. 1 ... Image guide, 2 ... Light guide, 3 ... Thin tube,
4 ... middle part, 5 ... base end part, 6 ... stainless steel tube, 7
… Tip part, 8… Plastic tube, A, B… Outer diameter dimension.

Continuation of the front page (56) References JP-A-60-253428 (JP, A) JP-A-63-288127 (JP, A) Actually opened 61-196702 (JP, U) Actually opened 63-169101 (JP , U)

Claims (1)

[Scope of utility model registration request] 1. A catheter-type fiberscope having a thin tube into which an image guide and a light guide are inserted, wherein the outer diameter of the thin tube is 0.5 mm or less. Of the stainless steel tube, and, while inserting and fixing the proximal end of the plastic thin tubular main body having an outer diameter smaller than the outer diameter of the stainless steel tube, into the tip of the stainless steel tube, From the middle part to the base end side of the main body portion is covered with an outer layer made of plastic having an outer diameter dimension smaller than the outer diameter dimension of the stainless steel tube, and further, at the tip of the main body portion, A catheter type fiber characterized in that a bending habit is imparted to form a bending habit probe section and only the image guide / objective lens and the light guide are provided in the main body section. Scope.