US 5,152,277 AGranted

Catheter tube

AssigneeTerumo Kabushiki Kaisha

InventorsHiroaki Honda, Masahiro Nudeshima

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Abstract

This invention relates to a catheter tube which is used for visualizing or medically treating the interior of a body cavity having a relatively small diameter, typically a blood vessel by inserting and leaving it in the body cavity. The catheter tube of the invention includes at least one inflatable/contractible balloon disposed adjacent the distal end thereof, and its tube body is formed with a lumen for inflating the balloon, a lumen for injecting a liquid into the body cavity, and a lumen for accommodating a visualizing or therapeutic instrument. The invention is characterized in that the visualizing or therapeutic instrument is moved in a longitudinal direction of the tube to move its distal end into and out of the opening of the instrument accommodating lumen, ensuring a clear observation over a wide field, that the respective lumens can be commonly replaced by a multi-purpose lumen, allowing the tube to be reduced in diameter, that visualization between two balloons provides a clearer visual image, and that a bypass lumen is additionally provided to maintain a blood flow through the blood vessel even during observation, enabling long-term observation.

Claims18

Dependent claims

A catheter tube for insertion into a body cavity, comprising:

a tube body having an axis, an outer peripheral wall, an open distal end portion, and a proximal end portion;
at least one inflatable and contractible balloon attached around the outer peripheral wall adjacent the open distal end portion of said tube body;
at least one lumen defined in said tube body and open to the open distal end portion of said tube body for accommodating at least one instrument therein;
a further lumen defined in said tube body in fluid communication with the interior of said balloon for inflating said balloon:
the at least one instrument accommodated in said at least one accommodating lumen enabling at least one of visualizing and medically treating the interior of the body cavity;
and
fluid-tight manipulator means provided at the proximal end portion of said catheter tube for moving the instrument through the tube body along the axis of the tube body and for positioning said instrument at a selected position relative to said tube body while maintaining said at least one accommodating lumen fluid- tight at the proximal end portion thereof, said fluid-tight manipulator means including:
a closed bellows connected to be in communication with said at least one accommodating lumen at the proximal end portion of said tube body, said closed bellows having the at least one instrument secured therein at the proximal end portion of said tube body;
and
a holder receiving said bellows for limiting the extent of expansion of said bellows, said holder including a cylinder member and a lid member provided with an external and an internal thread, respectively, the lid member being threadably engaged on the cylinder member so that the fluid-tight manipulator means is compressed and expanded by turning the lid member.

7 more elements

A catheter for insertion into a body cavity, comprising:

a tube body having an axis, an outer peripheral wall, an open distal end portion, and a proximal end portion;
a lumen defined in said tube body and open to the open distal end portion of said tube body;
an instrument accommodated in said lumen, said instrument enabling at least one of visualizing and medically treating an interior of the body cavity;
and
fluid-tight manipulator means provided at the proximal end portion of said catheter tube for moving the instrument through said tube body along the axis of said tube body and for positioning said instrument at a selected position relative to said tube body while maintaining said lumen fluid-tight at the proximal end portion thereof, said fluid-tight manipulator means including:
a closed and expandable bellows connected to be in communication with said lumen at the proximal end portion of said tube body, said closed bellows having said instrument secured therein at the proximal end portion of said tube body;
and
a holder receiving said bellows for limiting the extent of expansion of said bellows, said holder including a cylinder member and a lid member provided with an external and an internal thread, respectively, the lid member being threadably engaged on the cylinder member so that the fluid-tight manipulator means is compressed and expanded by turning the lid member relative to the cylinder member.

5 more elements

Dependencies are inferred from the claim text.