Sheath removal hole closing device using laser welding scheme
AssigneeKeio University
InventorsTsunenori Arai, Noriko Usami
Life of this patent
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Abstract
To provide a device and method for closing a sheath removal hole formed for introducing a vessel catheter by laser welding when diagnosis or treatment inside a blood vessel is performed by means of the catheter. The device for closing the sheath removal hole formed in the wall of the blood vessel by laser welding, comprising welding laser generating means, means for transmitting the welding laser, and means for monitoring the position of an end of the welding laser transmitting means, wherein the welding laser is radiated when the end of the welding laser transmitting means is located in the vessel wall.
Claims16
A device for closing a sheath removal hole formed in the wall of a blood vessel by laser welding, comprising welding laser generating means, means for transmitting the welding laser, and means for monitoring the position of an end of the welding laser transmitting means, wherein the welding laser is radiated when the end of the welding laser transmitting means is located in the vessel wall.
A control method for determining the position of an end of a light transmitting fiber and radiating a welding laser through the light transmitting fiber onto the wall of a blood vessel in which a sheath removal hole is formed, in order to close the sheath removal hole by laser welding, comprising the steps of:
- (a) radiating weak light used for determining a surrounding tissue through the light transmitting fiber inserted in the sheath inserted in the blood vessel, the fiber connected with a light generator;
- (b) measuring backscattered light of the radiated weak light by a detector;
- (c) determining a tissue surrounding the end of the light transmitting fiber;
- and
- (d) radiating welding laser if it is determined that the tissue surrounding the end of the light transmitting fiber is the vessel wall.
A device for monitoring the position of an end of monitoring light transmitting means, comprising means for generating monitoring light, means for transmitting the monitoring light, and means for detecting backscattered light of the monitoring light, wherein the monitoring light that is light having a wavelength absorbable by substances present in blood is radiated, the backscattered light of the radiated monitoring light is detected, and the position of the end of the monitoring light transmitting means is determined based on the intensity of the detected light.
Dependencies are inferred from the claim text.