JP2000116802A - Catheter for radiotherapy and catheter assembly for radiotherapy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter for radiotherapy and the catheter assembly for radiotherapy capable of precisely applying radioactive rays to a target tissue, suppressing adverse effects on a human body such as a radiation hazard, and improving the effect of the treatment. SOLUTION: This catheter 1 for radiotherapy is to be inserted into a lumen for radiotherapy. The catheter 1 has the catheter body 10 to be guided by a guide wire 8 into a lumen, a lumen 2 for a radiation wire which is installed inside the catheter body 10 and into which a radiation wire 7 with a radiation source 6 can be inserted, radiation source detecting means 5a, 5b to detect the position of the radiation source 6, and a guide wire lumen 4 into which the guide wire 8 can be inserted. It is preferable that the radiation wire 7 to be used for the catheter assembly 100 for radiotherapy has marker 61 for indicating the position of the radiation source 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catheter for radiotherapy, and more particularly to a catheter for radiotherapy and a catheter assembly for radiotherapy used for transferring a radiation source into a lumen and performing radiotherapy.

[0002]

2. Description of the Related Art Coronary stenosis is usually treated with percutaneous transluminal coronary angioplasty (PTCA) and PTA. This procedure has a smaller burden and risk on the patient than coronary artery bypass surgery, and has been actively performed in recent years. However, when PTCA treatment was performed, there was a problem that the probability of stenosis recurring was high.

Therefore, after PTCA treatment, intravascular radiotherapy is performed in the following procedure to prevent stenotic recurrence.

[0004] First, after PTCA treatment, an intraluminal radiation therapy catheter is inserted into a patient's body along a guide wire through at least one of an introducer and a guiding catheter already placed in the body. The catheter tip is placed near a target tissue (eg, a site where an interventional treatment has already been performed).

[0005] Next, a radiation administration wire is sent out into a catheter for radiotherapy by a predetermined method, a radiation source is arranged in the vicinity of a target tissue, and is left in the body for a predetermined time to irradiate the affected part with radiation. Remove the dosing wire.

[0006] In such an intravascular radiotherapy, unlike irradiation from outside the body, radiation can be locally applied to a target tissue, so that irradiation to normal tissues is avoided, and radiation damage is suppressed. The therapeutic effect can be improved.

However, in radiation therapy using such a catheter for radiation therapy and a radiation administration wire, it is necessary to accurately detect the radiation administration position, and therefore, the position of the radiation source can be accurately detected. There is a need for a radiation therapy catheter.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a radiation therapy catheter capable of accurately administering radiation to a target tissue, suppressing adverse effects on the living body such as radiation damage, and improving the therapeutic effect. And a catheter assembly for radiotherapy.

[0009]

This and other objects are achieved by the present invention which is defined below as (1) to (8).

(1) A radiotherapy catheter inserted into a lumen and used for radiotherapy, a catheter body guided into the lumen by a guide wire, and a radiation source provided in the catheter body Radiotherapy, comprising: a radiation administration wire lumen through which a radiation administration wire can be inserted, a radiation source detecting means for detecting the position of the radiation source, and a guide wire lumen through which the guide wire can be inserted. Catheter.

(2) The radiotherapy catheter according to the above (1), wherein the radiation source detecting means is made of a radiopaque material.

(3) The radiation treatment catheter according to the above (1) or (2), wherein the radiation administration wire lumen has a distal end closed.

(4) The radiation treatment catheter according to any one of (1) to (3), wherein the lumen for the radiation administration wire is provided coaxially with the catheter body.

(5) The radiotherapy catheter according to any one of (1) to (4), wherein the guide wire lumen and the radiation administration wire lumen are coaxially arranged side by side.

(6) The catheter for radiotherapy according to any one of (1) to (5), wherein the catheter body has a fluid-flowing lumen through which a fluid can flow and the catheter body has an opening.

(7) A radiation treatment catheter assembly comprising the radiation treatment catheter according to any one of the above (1) to (6) and a radiation administration wire provided with a radiation source.

(8) The radiation therapy catheter assembly according to (7), wherein the radiation administration wire includes a marker indicating a position of the radiation source.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a catheter for radiotherapy of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings. In FIGS. 1 to 4, the left side is “tip”,
The right side will be described as “base end”.

FIG. 1 is a longitudinal sectional view showing a first embodiment of the catheter assembly for radiotherapy of the present invention. The catheter assembly 100 for radiotherapy of the present invention shown in the drawings
It comprises a radiation treatment catheter 1 and a radiation administration wire 7.

In this embodiment, the radiation treatment catheter 1 is used for radiation treatment by being inserted into a lumen such as a blood vessel, and includes a catheter body 10 guided into the lumen by a guide wire 8. , The catheter body 1
0, a radiation administration wire lumen 2 through which a radiation administration wire 7 having a radiation source 6 provided therein can be inserted, and radiation source detection means 5a, 5b for detecting the position of the radiation source 6
And a guide wire lumen 4 through which a guide wire 8 can be inserted.

The catheter body 10 is made of a flexible material. As a constituent material of the catheter body 10, when introduced to the vicinity of the target site via a guiding catheter or a lumen of a blood vessel or the like, in order to ensure easy operation and safety, appropriate flexibility, elasticity, Those having slidability, mechanical strength and kink resistance are preferable, for example, polyethylene, polyolefin such as polypropylene, ethylene-vinyl acetate copolymer, polyvinyl chloride, polyethylene terephthalate, polyester such as polybutylene terephthalate, polyamide, polyimide , Polyurethane,
Examples thereof include a fluororesin, an elastomer, a copolymer, or a polymer alloy thereof, or a combination of two or more of them as appropriate.

In order to prevent the radiation emitted from the radiation source 6 moving in the catheter body 10 by inserting and removing the radiation administration wire 7 from being applied to tissues other than the target site, the above-mentioned configuration is adopted. It is preferable to mix a material that does not easily transmit radiation, for example, heavy metals such as Au, Ag, Pt, Pb, and W, and powders such as barium sulfate and bismuth oxide. However, the part for performing the radiation treatment, that is, the radiation source detecting means 5 of the catheter body 10
In the region between a and 5b, it is necessary to avoid the incorporation of the material that is difficult to transmit the radiation.

Further, in order to improve the slidability of the catheter 1 for radiation therapy, the outer surface of the catheter body 10 may be coated with a hydrophilic polymer substance which exhibits lubricity in a wet state.

The length of the catheter body 10 is appropriately selected depending on the case to be applied, but is preferably about 0.5 to 2 m, more preferably about 1.0 to 1.5 m. The outer diameter is preferably about 0.5 to 5 mm, and 0.8 to 3 mm.
About 0 mm is more preferable.

Inside the catheter body 10, there is formed a radiation administration wire lumen 2 through which a radiation administration wire 7 having a radiation source 6 can be inserted. The distal end of the radiation administration wire lumen 2 is closed,
1 are formed. This prevents body fluids such as blood from accidentally coming into contact with the radiation source 6 via the lumen or leaking radioactive substances into the body.

The radiation administration wire lumen 2 is provided coaxially with the catheter body 10. Thereby, it becomes easy to position the radiation source 6 at the axial center of the catheter body 10. Therefore, the distance from the radiation source 6 to the inner wall of the lumen to be irradiated can be made substantially equal, and the dose reaching the tissue can be made uniform.

The closed end 2 of the radiation administration wire lumen 2
A guide wire lumen 4 is provided further on the distal end side of 1. The guide wire lumen 4 is a lumen through which a guide wire 8 for guiding the radiation treatment catheter 1 into a lumen is inserted. The front opening 41 is provided. By providing the proximal opening 42 on the side of the catheter body 10, the guide wire can be quickly taken out or replaced, and the operability and handling are excellent.

The guide wire lumen 4 is provided coaxially with the catheter body 10. Accordingly, the movement of the catheter body 10 in the lumen guided by the guide wire 8 can be performed more safely and smoothly.

The guide wire lumen 4 and the radiation administration wire lumen 2 are coaxially arranged side by side. With such a configuration, it is easy to arrange the radiation source 6 at the center position in the lumen, and uniform irradiation can be performed.

Further, by arranging the radiation administration wire lumen 2 and the guide wire lumen coaxially side by side, the catheter body 10 can be configured to have only a single lumen in the radial direction, and the entire catheter can be constructed. The diameter can be reduced. Therefore, the present invention can be applied to radiotherapy in a narrow lumen, and the scope of application can be expanded, and safety and reliability can be improved.

Radiation source detecting means 5a and 5b are provided on the outer periphery near the distal end of the catheter body 10. Accordingly, the radiation treatment catheter 1 can be accurately placed at the target site, and the position of the radiation source 6 can be accurately detected.

The radiation source detecting means 5a and 5b are made of a radiopaque material. Accordingly, the position of the radiation source detecting means can be confirmed and determined because the radiation source detecting means can be visually recognized from the outside under radioscopy. Thus, the radiation treatment catheter 1 can be easily and accurately placed at a desired position, and the radiation source 6 can be arranged at a target site.

As the radiopaque material constituting the radiation source detecting means 5a, 5b, for example, Au, Ag, Pt,
Materials such as heavy metals of W and Pb and alloys and salts mainly containing these metals can be given.

The radiation source detecting means 5a and 5b are each formed of a thin tubular body, and the tubular body is connected to the catheter body 1.
It is fixed by caulking on the outer peripheral surface of the zero. In this case, the inner diameter of the radiation source detecting means 5a, 5b is preferably substantially equal to or slightly smaller than the outer diameter of the catheter body 10. The shape of the radiation source detecting means is not limited to the tubular body shown in the figure, but may be a band, a wire, or the like.

In the case of this embodiment, the radiation source detecting means 5
A part of a and 5b is buried in the outer peripheral surface of the catheter body 10, so that the catheter is securely fixed. Further, the radiation source detecting means 5 a and 5 b are covered with the resin 11.
This makes it possible to more securely fix the radiation source detecting means, eliminate a step between the outer peripheral surface of the catheter body 10 and the radiation source detecting means 5a, 5b, and slide the catheter body 10 in the lumen. It can be performed smoothly and tissue damage can be prevented. Therefore, the fixed position of the radiation source detecting means 5a, 5b does not shift or fall off due to bending of the catheter body 10, etc.
Can accurately perform the function of detecting the position.

The material of the resin 11 is not particularly limited.
Although the above-mentioned materials that can be a constituent material of the catheter main body 10 are exemplified, it is more preferable to use the same resin material as the catheter main body 10. The resin 11 may be, for example, a solution containing a constituent material of the resin 11 by a radiation source detecting means 5.
It can be provided by applying and drying so as to fill a step with the catheter body 10 around the a and 5b.

The radiation source detecting means 5a and 5b are preferably provided at intervals substantially equal to the axial length of the radiation source 6 of the radiation administration wire 7. Thereby, the position of the radiation source 6 and the irradiation range of the radiation can be detected more accurately. In the present embodiment, when the distal end of the radiation source 6 is aligned with the proximal end position of the radiation source detecting unit 5a, the proximal end of the radiation source 6 corresponds to the distal end position of the radiation source detecting unit 5b.

When a radiation administration wire without a marker is used, when the tip of the radiation administration wire is inserted into the closed end 21 of the lumen 2 for radiation administration wire, the radiation source 6 detects the radiation source. Means 5a, 5
b. Thus, the position of the radiation source 6 can be detected even if the radiation administration wire 7 is not provided with a marker or the like.

At the proximal end of the catheter body 10, a connector 30 whose inner diameter gradually increases toward the proximal side is mounted. The distal end side of the connector 30 is connected to the radiation administration wire lumen 2, and the radiation administration wire 7 is connected to the connector 3.
0 is inserted into the radiation administration wire lumen 2. On the other hand, the proximal end side of the connector 30 is configured to be connectable to an after loader (not shown) capable of sending, winding and storing the radiation administration wire 7.

The connector 30 can be made of various resin materials, for example, polyethylene, polypropylene, polycarbonate, polyamide, polysulfone,
Preferred are polyarylate and the like.

The catheter assembly 1 for radiotherapy of the present invention
The radiation administration wire 7 used for 00 has a radiation source 6 near the distal end.

As the radiation source 6, ³² P, ⁴⁵ Ca, ⁶⁰ C
o, ⁸⁹ Sr, ⁹⁰ Sr, ⁹⁰ Y, ¹⁰⁶ Ru, ¹⁰⁶ Rh, ¹⁹² I
r, ¹⁹⁸ Au and the like are preferred. These radiation sources are relatively easy and inexpensive to manufacture and have good handling.

The radiation source 6 is obtained by encapsulating a radioactive substance in a cylindrical capsule and welding it to a radiation administration wire 7, fixing it with an adhesive or the like, or forming the radioactive substance into a filament. This is wound around a radiation administration wire 7 to form a radiation source 6.

Markers 61 are provided at both ends of the radiation source 6. Thereby, the position of the radiation source 6 can be directly visually recognized, and in combination with the radiation source detecting means 5a and 5b of the catheter 1 for radiation therapy of the present invention, the position of the radiation source 6 can be confirmed accurately and easily. it can.

As a constituent material of the marker 61, the same material as that of the above-mentioned radiation source detecting means can be used. A ring made of such a constituent material can be fixed to the marker 61 by caulking the outer periphery of the radiation administration wire 7 near both ends of the radiation source 6.

The constituent material of the radiation administration wire 7 is as follows.
When inserted into the radiation administration wire lumen 2, flexibility, elasticity, and the like are high enough to ensure safety and operability.
Those having slidability, mechanical strength, and followability are preferable.
Such materials include, for example, stainless steel, tungsten, Ni-Ti alloy, Ni-Al alloy, Cu-A
1 alloy, metal material such as Cu-Zn alloy, polyamide,
Polyimide, ultra-high molecular weight polyethylene, fluororesin,
High-tensile polymer fibers such as glass fibers are exemplified. Further, it is preferable to use a material having a shape memory property from the viewpoint of improvement of operability and the like.

Further, a part or all of the surface of the radiation administration wire 7 made of these materials may be coated with a resin material for the purpose of improving slidability and the like.

The outer diameter of the radiation administration wire 7 is not particularly limited, but is preferably about 0.1 to 1.5 mm, more preferably about 0.25 to 0.9 mm.

The catheter 1 for radiotherapy is manufactured, for example, by the following method.

First, a tube body serving as a catheter body is formed by extrusion. This tube body is cut into an appropriate length to obtain the catheter body 10.

On the outer periphery of the catheter body 10, ring-shaped radiation source detecting means 5a, 5b prepared in advance are fitted.

When the inner diameter of the ring of the radiation source detecting means 5a, 5b is smaller than the outer diameter of the catheter body 10, the catheter body 10 is inserted into the ring while being extended, and then the extended state is released. The ring is further heated, and a part or all of the ring is embedded in the outer peripheral surface of the catheter body 10 and fixed. The resin 11 is applied from above to fill the step between the radiation source detecting means 5a and 5b and the catheter body 10.

Next, the distal opening 4 of the catheter body 10
A filler made of the same resin material as that of the catheter body 10 is injected from 1 to close the distal end opening 41 from the distal end side of the radiation source detecting means 5a. As a result, the radiation administration wire lumen 2 having the closed end 21 is formed.

Further, the guide wire lumen 4 is provided on the side of the catheter body 10 on the distal side of the closed end 21.
The base end side opening 42 is formed. In addition, the catheter body 1
A metal core having an outer diameter substantially equal to the inner diameter of the guide wire lumen 4 is inserted from the distal end side opening 41 to a position communicating with the proximal end side opening 42. In this state, the guide wire lumen 4 is formed by putting the distal end of the catheter body 10 into a bottomed cylindrical heat mold, and the distal end of the catheter body 10 is formed into a round shape.

On the other hand, the connector 30 is attached to the proximal end of the catheter body 10 and both are fixed using an adhesive, whereby the radiation treatment catheter 1 is obtained.

Further, when a coating layer made of a hydrophilic resin is formed on the surface of the catheter body 10, a supporting metal rod is inserted from the base end into the radiation administration wire lumen, and the support wire is also inserted into the guide wire lumen 4. Can be inserted from the distal opening 41 or the proximal opening 42 and immersed in the resin liquid from the distal end of the catheter body 10.

Next, an example of radiation treatment using the catheter assembly for radiation treatment of the present embodiment will be described.

First, a sheath is inserted into the femoral artery, a guiding catheter (not shown) is inserted through the sheath, and the distal end of the guiding catheter is positioned near the target tissue to be subjected to radiation treatment, such as a PTCA treatment site. To the side.

Next, the catheter 1 for radiation therapy is inserted into the guiding catheter with the guide wire 8 being advanced. Radiation source detecting means 5a and 5 under fluoroscopy
While confirming the position of b, advance in the distal direction, and place the radiation treatment catheter 1 so as to be located near the target tissue.

Thereafter, the radiation administration wire 7 is inserted into the radiation administration wire lumen 2, and the radiation source 6 is transferred so as to be located between the radiation source detection means 5a and 5b.

As shown in the figure, when the radiation source 6 reaches the target position, the radiation source 6 is left for a predetermined time in that state, and the radiation is irradiated to the target tissue.

After the completion of the irradiation, the radiation administration wire 7
Quickly and place in a shielded container.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the catheter assembly for radiotherapy of the present invention. In the figure, the same members and the same items as those in FIG. 1 described above are denoted by the same reference numerals, and description thereof will be omitted.

The radiation treatment catheter body 100 of this embodiment includes the radiation treatment catheter 1 and the radiation administration wire 7.

The catheter 1 for radiation therapy has a guide wire lumen 4 and a radiation administration wire lumen 2 provided in parallel in the axial direction. At the base end side of the base end side opening 42 of the guide wire lumen 4, there is provided a fluid flow lumen 45 which serves as a flow path for injecting and sucking a liquid such as a drug solution or a flow path for sucking a body fluid. And
A side hole 46 is provided near the tip.

A connector 30 is mounted on the proximal end of the catheter 1 for radiation therapy. The connector 30 is a T-shaped hollow member branched into two branches, and one of the branch pipes is
A port 47 communicating with the radiation administration wire lumen 2;
The other constitutes a port 44 that communicates with the fluid circulation lumen 45.

This embodiment is different from the first embodiment in that the radiation source detecting means 5a and 5b are provided inside the catheter body 10. Thereby, the smoothness of the outer periphery of the catheter body 10 is maintained, so that the operability and safety in the lumen of the catheter body 10 are further improved.

The radiation source detecting means 5a and 5b
It is provided outside the radiation administration wire lumen 2. With such a configuration, the radiation source detecting means 5a and 5b can be brought closer to the radiation source 6, so that the position of the radiation source 6 can be detected more accurately. For example, even when the catheter body 10 and the radiation administration wire 7 are bent near the position of the radiation source 6, there is almost no deviation between the mutual positions, and the position of the radiation source 6 can always be accurately detected. it can.

The radiation therapy catheter 1 of the present embodiment
Is manufactured, for example, as follows.

First, as in the case of the first embodiment, a single-lumen tube forming the catheter body 1 is formed by extrusion. Next, a core metal for preventing occlusion is passed through the inside of the tube body, radiation source detecting means 5a and 5b are set at predetermined positions of the tube body, and then the radiation is detected while the tube body is inserted through an extrusion die. A single lumen is formed in which the guide wire lumen 4 and the fluid flow lumen 45 communicate with each other in parallel with the central lumen serving as the administration wire lumen.

Next, a closed end 21 is formed in the central lumen by closing the distal end of the tube body.

Further, a filler made of the same resin material as that of the catheter body 10 is injected into a portion at a predetermined distance from the distal end to the proximal end of the lumen serving as the guide wire lumen, thereby dividing the lumen. The side is referred to as a guide wire lumen 4 and the proximal side is referred to as a fluid flow lumen 45. A proximal opening 42 is provided at the proximal end of the guidewire lumen 4, and a side hole 46 is provided near the distal end of the fluid-flow lumen 45.
Is provided.

The radiation therapy catheter 1 of the present embodiment
The position of the proximal opening 42 of the guide wire lumen 4 can be freely selected and provided as compared with the case of the first embodiment. That is, in the case of the first embodiment, the proximal opening 42 of the guide wire lumen 4 is limited to a position on the distal end side of the closed end 21 of the radiation administration wire lumen 2, but in the present embodiment, such a position is used. There is no limitation, and the proximal opening 4 depends on the operability of the guide wire 8 and the irradiation site.
The position 2 can be arbitrarily set and provided.

Further, the side hole 46 of the fluid flow lumen 45 is provided.
Can also be provided at any position, for example, since it becomes possible to directly administer a contrast agent, a drug, etc. from near the target tissue,
It is extremely effective in improving diagnostic accuracy and therapeutic effects.

Thereafter, the distal end of the catheter body 10 may be rounded in the same manner as in the first embodiment, and a coating layer made of a hydrophilic resin may be formed on the surface of the catheter body 10. Furthermore, the connector 30 is attached to the base end of the catheter body 10 and fixed using an adhesive, whereby the radiation treatment catheter 1 is obtained.

In the illustrated embodiment, the radiation administration wire lumen 2 is arranged coaxially with the catheter body 10. However, the radiation treatment catheter of the present invention is not limited to this. The radiation administration wire lumen 2 may be provided at a position eccentric with respect to the cross section. However, when the radiation source is arranged coaxially with the catheter body 10 as in the present embodiment, it becomes easy to position the radiation source at the center of a lumen such as a blood vessel, and uniform irradiation of radiation becomes possible. .

FIG. 3 is a longitudinal sectional view showing a third embodiment of the catheter for radiotherapy of the present invention. 2 is the same as the radiation treatment catheter shown in FIG. 2 except that the guidewire lumen 4 extends to the proximal end and the proximal opening 42 is located at the proximal end of the port 44.

The guide wire lumen 4 is a guide wire 8
Can also function as a lumen for fluid distribution in a state in which is not inserted. With such a configuration, it is not necessary to provide a side hole in the catheter main body, and the manufacturing process of the catheter main body can be simplified.

FIG. 4 is a longitudinal sectional view showing a fourth embodiment of the catheter assembly for radiotherapy of the present invention.

In the present embodiment, three lumens including the guide wire lumen 4, the fluid circulation lumen 45, and the radiation administration catheter lumen 2 are provided in parallel with the axial direction of the catheter body 10.

A connector 30 is mounted on the proximal end of the catheter 1 for radiation therapy. The connector 30 is a hollow member branched into three branches, and the branch pipes constitute a port 47 communicating with the radiation administration lumen 2, a port 48 communicating with the fluid circulation lumen 45, and a port 44 communicating with the guide wire lumen 4, respectively. are doing.

This is the same as the radiation therapy catheter shown in FIG. 3 except that the guidewire lumen 4 and the fluid circulation lumen 45 are provided independently.

As described above, the radiotherapy catheter of the present invention has been described with respect to the illustrated embodiments. However, the present invention is not limited to these embodiments. For example, the guidewire lumen is provided inside the catheter body. In addition to the above case, it may be provided in a tube provided on the outer peripheral portion of the catheter body. Further, the configuration of each means can be replaced with any configuration having the same function.

[0084]

As described above, according to the catheter for radiation therapy and the catheter assembly for radiation therapy of the present invention, the position of the radiation source can be accurately detected.
Treatment such as treatment can be performed quickly and reliably. As a result, the safety and effect of irradiation can be improved, and the risk of side effects and recurrence of a medical condition can be reduced.

Further, since the radiation therapy catheter of the present invention has a radiation source detecting means, it can be used even if the radiation administration wire is not provided with a marker or the like. Further, when a radiation administration wire having a marker is used, radiation source detection can be performed more reliably.

[Brief description of the drawings]

FIG. 1 is a first view of a catheter assembly for radiotherapy of the present invention.
It is a longitudinal section showing an embodiment.

FIG. 2 is a second view of the catheter assembly for radiotherapy of the present invention.
It is a longitudinal section showing an embodiment.

FIG. 3 is a third view of the catheter assembly for radiotherapy of the present invention.
It is a longitudinal section showing an embodiment.

FIG. 4 is a fourth view of the catheter assembly for radiotherapy of the present invention.
It is a longitudinal section showing an embodiment.

DESCRIPTION OF THE SYMBOLS 1 Radiotherapy catheter 10 Catheter main body 100 Radiotherapy catheter assembly 2 Radiation administration wire lumen 21 Closed end 30 Connector 4 Guide wire lumen 41 Tip opening 42 Base opening 44 Port 45 Fluid flow Lumen 46 Side hole 47, 48 Port 5a, 5b Radiation source detecting means 6 Radiation source 61 Marker 7 Radiation administration wire 8 Guide wire

Claims (8)

[Claims] 1. A radiation therapy catheter inserted into a lumen and used for radiation therapy, comprising: a catheter body guided into the lumen by a guide wire; and a radiation source provided in the catheter body. A radiation administration wire lumen through which the radiation administration wire can be inserted, a radiation source detection unit that detects the position of the radiation source, and a guide wire lumen through which the guide wire can be inserted. catheter. 2. The radiotherapy catheter according to claim 1, wherein the radiation source detecting means is made of a radiopaque material. 3. The radiation treatment catheter according to claim 1, wherein the distal end of the radiation administration wire lumen is closed. 4. The radiation treatment catheter according to claim 1, wherein the radiation administration wire lumen is provided coaxially with the catheter main body. 5. The radiation guide wire lumen and the guide wire lumen are coaxially juxtaposed.
5. The catheter for radiotherapy according to any one of items 4 to 4. 6. The radiation treatment catheter according to claim 1, wherein the catheter body has a fluid circulation lumen through which a fluid can flow and having an opening in the catheter body. 7. A radiation therapy catheter assembly comprising: the radiation therapy catheter according to claim 1; and a radiation administration wire including a radiation source. 8. The radiation therapy catheter assembly according to claim 7, wherein the radiation administration wire includes a marker indicating a position of the radiation source.