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JP-2026075062-A - Balloon catheter

JP2026075062AJP 2026075062 AJP2026075062 AJP 2026075062AJP-2026075062-A

Abstract

[Challenge] To improve the accuracy of radiation therapy. [Solution] The present invention relates to a balloon catheter comprising an external catheter 100, a balloon 200 connected to one side of the external catheter and capable of being inflated and deflated, and inserted into or discharged from a target site in a living body, and an internal catheter 300 provided to be movable along the external catheter in a first direction for insertion into the balloon or in a second direction for discharge from the balloon, wherein the internal catheter is a balloon catheter that can be discharged from the balloon while the balloon is inflated and fixed at the target site in the living body. [Selection Diagram] Figure 1

Inventors

  • ジョン，ヌリ ヒョン
  • バン，ジョンベ
  • キム，ソンジュン
  • キム，テ フン

Assignees

  • ラデクセル インコーポレイテッド

Dates

Publication Date
20260507
Application Date
20251001
Priority Date
20241021

Claims (12)

  1. External catheter and A balloon connected to one side of the external catheter, which is inflatable and deflated, and which is inserted into or expelled from a target site in the body, An internal catheter is provided to be movable along the external catheter into the balloon in a first direction or in a second direction out of the balloon, Includes, The internal catheter is a balloon catheter in which the balloon can be discharged from the balloon while it is inflated and fixed to the target site of the living body.
  2. The balloon catheter according to claim 1, further comprising a first stopper that restricts the range of movement of the internal catheter in the second direction so as to prevent the internal catheter from detaching from the external catheter.
  3. The first stopper is, A hook groove formed in the external catheter, A hook is formed in the internal catheter and engages with the hook groove when the internal catheter moves in the second direction, The balloon catheter according to claim 2, characterized by including the following:
  4. The first stopper is, Includes a plug connected to one side of the internal catheter, The aforementioned plug is A plug body connected to one side of the internal catheter, A channel formed in the plug body and communicating with the internal catheter, A step protruding from one side of the plug body, which catches on the contact part of the outer catheter as the internal catheter moves in the second direction, The balloon catheter according to claim 2, characterized by including the following:
  5. The balloon catheter according to claim 4, characterized in that the plug further includes a locking step that protrudes from the other side of the plug body and locks and secures to the inner circumference of the internal catheter.
  6. The balloon catheter according to claim 1, further comprising a second stopper that limits the range of movement of the internal catheter in a first direction and a range of movement in a second direction so as to prevent the internal catheter from detaching from the external catheter.
  7. The second stopper is, Two locking protrusions are attached to the outer circumference of the outer catheter at intervals along the direction of movement of the inner catheter, A movable projection is coupled to the outer circumference of the internal catheter and positioned between the two locking projections, The balloon catheter according to claim 6, characterized by including the following:
  8. The balloon catheter according to claim 1, further comprising a drive part that moves the internal catheter in a second direction while the balloon is inflated and fixed to the target site of the living organism.
  9. The aforementioned drive part is The balloon catheter according to claim 8, characterized in that it includes an actuator for moving the internal catheter in the second direction.
  10. The aforementioned drive part is The balloon catheter according to claim 8, further comprising a fluid supply part that injects fluid into the balloon such that the pressure of the fluid injected into the balloon assists the movement of the internal catheter in the second direction.
  11. The aforementioned external catheter is A guide part connected to the balloon and guiding the movement of the internal catheter, A contact part protrudes from the guide part toward the internal catheter and adheres closely to the internal catheter, The balloon catheter according to claim 1, characterized by including the following:
  12. The balloon catheter according to claim 1, further comprising a wing portion formed to protrude from the outer circumference of the external catheter so as to limit the depth to which the external catheter is inserted into a target site in a living organism.

Description

This invention relates to a balloon catheter. Radiation therapy involves irradiating a living organism with radiation such as X-rays, gamma rays, electron beams, or proton beams to slow the growth of diseased tissue or destroy it. Here, diseased tissue may include cancer. During radiation therapy, the distribution of radiation dose can change depending on the density of the medium located in the path through which the radiation beam passes through the body. Specifically, if two media with different densities exist in the path through which radiation passes through the body, the boundary region between these two media may exhibit a greater change in radiation dose distribution than other areas. To reduce the radiation's impact on surrounding tissues during radiotherapy, a balloon can be inserted into a body cavity surrounding the lesion (hereinafter referred to as the "target site") to fix the lesion and the target site. Here, the balloon can be inserted into the target site via an internal catheter (or guidewire). Specifically, this can be done by, for example, inserting the internal catheter into a balloon containing the internal catheter, and then inserting both the balloon and the internal catheter into the target site. However, the internal catheter present inside the balloon caused the following problems: First, the internal catheter present inside the balloon made it impossible to lower the balloon's internal density below a certain level. However, increasing the density inside the balloon is relatively easy; it simply requires injecting a high-density substance into the balloon. Furthermore, when an internal catheter is present inside the balloon, this catheter can induce interference with the particle beam during radiation therapy using particles such as electrons, protons, and carbon ions, causing a problem in which the target point of the particle beam changes. Furthermore, when an internal catheter was present inside the balloon, its position within the balloon changed, leading to uncertainty in the radiation dose distribution both inside and around the balloon. Furthermore, when an internal catheter is present inside the balloon, this internal catheter induces the generation of secondary electrons within the balloon, reducing the effectiveness of radiation dose control during MCRT (Magnetic Controlled Radiation Therapy), which uses a magnetic field to control the radiation path during X-ray or other radiation therapy. Therefore, it was necessary to expel the internal catheter located inside the balloon while the balloon was inserted into the target site of the living body. The common method for expelling the internal catheter involves removing it from inside the balloon while the balloon is not inflated. However, this method had the following problems: First, there was a problem in that, at the moment the internal catheter was discharged from inside the balloon while it was inserted into the target site in the body, the balloon's position changed due to forces from various directions exerted by the internal organs and muscles within the body. Furthermore, when pressure exists within the body, a problem arises where the balloon becomes trapped by the internal catheter at the moment the internal catheter is expelled from the balloon while the balloon is inserted into the target site of the body. For example, the balloon may be pulled by the internal catheter as it is expelled. In radiation therapy, maintaining the balloon's position at the target site in the body is crucial. Therefore, conventional methods of expelling the internal catheter from inside the balloon while it is deflated are unsuitable for radiation therapy because the balloon's position can change. Consequently, balloons capable of expelling the internal catheter were not used in radiation therapy. Korean Published Patent No. 10-2013-0009445 (January 23, 2013) This is a cross-sectional view showing a balloon catheter according to one embodiment of the present invention.This is a cross-sectional view showing the balloon in its inflated state in Figure 1.This is a cross-sectional view showing a first stopper of a balloon catheter according to one embodiment of the present invention.Figure 3 is a cross-sectional view showing the balloon in an inflated state.This is a cross-sectional view showing a second stopper of a balloon catheter according to one embodiment of the present invention.Figure 5 is a cross-sectional view showing the balloon in an inflated state.This is a cross-sectional view showing the operation process of a balloon catheter according to another embodiment of the present invention.This is a cross-sectional view showing the operation process of a balloon catheter according to another embodiment of the present invention.This is a cross-sectional view showing the operation process of a balloon catheter according to another embodiment of the present invention.This is a cross-sectional view showing the operation process of