JPH01297036A - Catheter type blood vessel endoscope - Google Patents

Abstract

PURPOSE:To locate an endoscope in the center of a blood vessel and to cause a blood vessel wall to easy to see by controlling a fluid supplying quantity to each baloon by means of the position instructing signal of a catheter position setting means in a condition to insert a catheter into the blood vessel and setting it in a prescribed largeness. CONSTITUTION:The tip part circumference of a catheter 1 is equipped with baloon 51-53 mutually at a gap in a 120 deg. interval, and to fine tubes 61-63 to communicate to respective baloons, a tridirectional valve switched to an interrupted position, an air opening position and a pressurized He gas tank is connected. By a baloon control on-singal, a coordinates position signal corresponding to the necessary position of a blood vessel section is supplied to an expansion quantity instructing circuit. Thus, a valve control circuit compares respective expansion quantity instructing signal and detection pressure value, and it executes the changeover and interruption control of the tridirectional valve according to the difference. A He gas is pressed in or exhausted.pressure- reduced to pipes 71-73, a setting at a prescribed expansion quantity is executed, and the tip part of the catheter 1 is moved to a section position in a condition approximately parallel to a wall surface in the blood vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a catheter-type angioscope inserted into a blood vessel for endovascular viewing, intra-arterial treatment, or the like.

(Prior Art) Since the viewing angle of an endoscope is generally small, in curved areas such as the digestive tract, it is necessary to curve the distal end of the endoscope to observe the target area. For this purpose, an articulating pipe 23 with wires 22 attached to both sides or all sides as shown in FIG.
An endoscope is well known in which a flexible part consisting of a wire z2 is arranged in parallel with a fiberscope bundle, and the tip part can be curved by pulling or loosening the wire z2 by rotating the operation dial 24 at hand.

(Problems to be Solved by the Invention) On the other hand, when using an angioscope to observe the coronary arteries, the outer diameter of the angioscope is
1.5m with built-in light guide fiber for tip illumination and water supply/absorption channels for securing endovascular visualization
It must be less than m. Therefore, the diameter is 9mm~
It is difficult to adopt the above-mentioned mechanism of 15-1.

Further, when using a laser beam to remove a blood clot in a blood vessel, for example, if the position is adjusted obliquely to the blood vessel wall and the light is irradiated, the risk of perforating the blood vessel increases.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a catheter-type angioscope that has a compact structure and can be used to adjust its cross-sectional position along a blood vessel wall by external manipulation.

(Means for Solving the Problems) In order to achieve this object, the present invention attaches at least two balloons (5° to 53) around the distal end of a vascular endoscopic catheter (1), and A fluid supply path (6I to 61.71 to 7.) communicating with this is formed along the catheter (1), and the catheter position at the cross-sectional position of the blood vessel is set by an external operation and a corresponding position indication signal is output. a catheter position setting means (10) for inflating each balloon (S+ to 53) to a predetermined size in response to the position instruction signal; means (11), and fluid supply paths (6, ~63.7I~73) in accordance with the expansion amount instruction signal.
) Fluid supply means (121 to 1) for pressurizing or discharging fluid from the rear end of each balloon (5, to 53)
23.13. ~131.141~141.15□~15
3.16).

(Operation) When the catheter (1) is inserted into a blood vessel and the catheter position setting means (10) is operated while observing the inside thereof, the expansion amount command signal generating means (11) is activated in response to the position command signal. An inflation amount instruction signal is generated for each balloon (51-5.). As a result, the fluid supply means (12, S-123, 13, ~133.14°~14
3.15t~15. 1, 16) controls the amount of fluid supplied to each balloon (5, - 53) and sets it to a predetermined size. Therefore, the catheter (1) is adjusted to a blood vessel cross-sectional position corresponding to the relative size relationship of the balloons (S+~53).

When there are two balloons (L to SS), the position can be adjusted in the linear direction by inflating and deflating the balloons, but adjustment in the two-dimensional blood vessel cross section is also possible by adjusting the rotational position of the catheter (1).

(Embodiment of the Invention) FIGS. 1 and 2 show a catheter-type angioscope according to an embodiment of the present invention.

In FIG. 1, catheter l is 1.5 as usual.
It has an outer diameter of about 1.0 mm, and is equipped with a group of optical fibers 21 for observation and illumination, a fiber 22 for guiding a laser beam, and a water supply/water absorption pipe 23.
Place the balloons at 20 degree intervals 5. ~5. A thin tube 61 with an inner diameter of about 0.1 mm communicates with each
~6. is formed. At the rear base 1a of the catheter 1, tubes 7, .about.73 communicating with the thin tubes 6.degree.-63, respectively, are led out separately from the catheter 1.

These tubes are arranged in a cut-off position, an atmosphere open position, and a He gas storage position, as shown in Figure 2.
The associated three-way valve 121 switches to either tank 16
~12 units each.

In the figure, a joystick 10 serves as a catheter height setting means, and outputs a coordinate signal corresponding to the direction and amount of tilting at the origin position of the X-Y axis plane.

Reference numeral 11 denotes an inflation amount instruction circuit, which converts the input X and Y coordinate signals into an inflation amount instruction signal that indicates the amount of inflation of the balloons 51 to 53 in accordance with the blood vessel cross-sectional position defined by the input X and Y coordinate signals. This expansion amount instruction circuit can be configured using a CPU that converts one x and Y coordinate signal into three expansion amount instruction signals. Further, it starts operating in response to a balloon control ON signal generated by an external operation, and generates an inflation amount instruction signal that does not inflate any of the balloons 51 to 53 when the balloon control ON signal disappears.

12, ~122 are ties in the tubes 7I~73 to which they belong.
A pressure sensor that detects pressure, each with an A/D converter 13. ~133 follows.

14 and 143 are valve control circuits, each of which compares the expansion amount instruction signal with the A/D! Converter 13. ~133
When the output value of the affiliated three-way valve falls below 15. ~15
．． is switched to the He tank 16, and when it exceeds, it is exhausted to the atmosphere, and when it matches within a predetermined error range, it is cut off and the tube 7
, to maintain the Ile pressure within 73. Moreover, these valve control circuits are an A/D converter 13. 131 exceeds the limit value or suddenly decreases, the three-way valves 151 to 153 are shut off.

17 is a cathode ray tube, which controls the pressure inside the balloons 51 to 53, that is, an A/D converter; 13. ~13. The level corresponding to the output value of is displayed as lines 171 to 173 in the radial direction at intervals of 120 degrees in accordance with the arrangement, and when the above-mentioned abnormality occurs, a message to that effect is also displayed.

The operation of the catheter-type angioscope configured as described above is as follows.

A catheter 1 is inserted into an artery, and a vibrator 23 is inserted as is well known.
Inject heated physiological saline through the fiber section 2. Then, illuminate the vessel through and observe the inside of the blood vessel.
Generate balloon control on signal, joystick l
When O is correspondingly tilted to a desired position on the blood vessel cross section, a corresponding coordinate position signal is supplied to the dilatation amount indicating circuit 11 and converted into a dilation amount indicating signal. As a result, the valve control circuit 14□~
14. compares the associated expansion amount instruction signal and the associated detected pressure value, and adjusts the associated three-way valve 15 according to the difference.
, to 151, to pressurize He gas into the associated pipes 7I to 73 or to exhaust or
Reduce the pressure and set to a predetermined amount of expansion. As a result, the distal end of the catheter I moves in a cross-sectional position substantially parallel to the wall surface within the blood vessel. Since there is a gap between the balloons 5I to 53, blood flow or water flow is not obstructed, and treatment is performed by laser light irradiation through the laser light guide fiber 2□ at a desired setting position if necessary.

After finishing, all balloons 51 to 53 are deflated by extinguishing the balloon control ON signal and the catheter l is closed.
Remove.

In the above-described embodiments, a liquid may be used as the fluid depending on the case, and the fluid supply means may be implemented by controlling the position of the piston of the cylinder in response to the expansion instruction signal. Further, the position setting means may output a polar coordinate signal, or may have a different operation structure. The number of balloons may be four or more, and a ring-shaped balloon 25 that can be similarly inflated and deflated may be attached to the rear as shown in FIG. 3, and inflated during treatment to cut off blood flow. Conceivable.

The present invention is also applicable to the case where the catheter is not equipped with a laser irradiation fiber or, instead, has a built-in treatment device using a hot tip method or a cutter method for thrombus treatment.

(Effects of the Invention) As described above, according to the present invention, a catheter-type angioscope that requires almost no change in the outer diameter of the catheter itself is realized.
It becomes possible to place the endoscope in the center of the blood vessel, making it easier to see the condition of the blood vessel wall. In addition, the endoscope can be fixed at any location within the blood vessel, allowing easy observation of the target site on the inner wall of the blood vessel, and treatment at any location. In particular, laser irradiation,
When used to treat intra-arterial thrombi using the hot tip method or cutter method, the risk of perforation is reduced because the catheter moves parallel to the blood vessel wall. It is also possible to perform PTCA (percutaneous coronary angioplasty).

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a catheter portion of a catheter-type angioscope according to an embodiment of the present invention and a front view of its distal end;
FIG. 2 is a diagram showing the structure of the main part following this catheter section, FIG. 3 is a perspective view of the distal end of the catheter section according to another embodiment of the present invention, and FIG. 4 is a conventional position-adjustable inner part. FIG. 3 is a cross-sectional view of the main parts of the endoscope. l...catheter, IO...joystick, 1
2, ~12.・3-way valve, 16-He tank.

Claims (1)

[Scope of Claims] At least two balloons are attached around the distal end of a blood vessel endoscopic catheter, and a fluid supply path communicating with each balloon is formed along the catheter, and the position of the catheter in a cross-sectional position of the blood vessel is determined. a catheter position setting means configured by an external operation to output a corresponding position indication signal; and generating respective inflation amount indication signals so as to inflate each balloon to a predetermined size in response to the position indication signal. and a fluid supply means for pressurizing or discharging the fluid from the rear end of the fluid supply path to each of the balloons in response to the inflation amount instruction signal. Features of catheter-type angioscope.