Medical guide wire and a method of making the same
AssigneeAsahi Intecc Co., Ltd.
InventorTomihisa Kato
Life of this patent
Estimating the term…
Abstract
In a medical guide wire 1, a helical spring 3 has a radiopaque portion defined on a front helical spring tube 31 of the helical spring 3. An elongation core 2 has a thinned portion at a distal end portion 21 and a thickened portion at a proximal end portion 22, and the distal end portion 21 of the elongation core 2 is placed within the helical spring 3, both the distal end portions of the helical spring 3 and the elongation core 2 are firmly fixed so that an outer surface of the helical spring 3 is covered by a synthetic coat 4. A flotage chamber 5 is provided in the radiopaque portion of the helical spring 3 to give a buoyancy to a distal end portion 12 which is liable to hang by its weight upon manipulating the guide wire 1 in the blood streams.
Claims20
A medical guide wire comprising:
- a helical spring having a radiopaque portion defined at least on a distal end portion of said helical spring;
- an elongation core having a thinned portion at a distal end portion and a thickened portion at a proximal end portion of said elongation core, said distal end portion of said elongation core being placed within said helical spring, both the distal end portions of said helical spring and said elongation core being firmly fixed so that an outer surface of said helical spring being covered by a synthetic coat;
- and
- a flotage chamber provided in said radiopaque portion of said helical spring.
A medical guide wire comprising:
- a helical spring having a radiopaque portion defined at least on a distal end portion of said helical spring;
- an elongation core having a multi-stepped flat portion at a distal end portion and having a thickened portion at a proximal end portion of said elongation core, said distal end portion of said elongation core being placed within said helical spring, both the distal end portions of said helical spring and said elongation core being air-tightly fixed so that an outer surface of said helical spring being covered by a synthetic coat;
- and
- a flotage chamber provided in said radiopaque portion of said helical spring.
A medical guide wire comprising:
- a helical spring having a radiopaque portion defined at least on a distal end portion of said helical spring;
- an elongation core having a thinned portion at a distal end portion and having a thickened portion at a proximal end portion of said elongation core, said distal end portion of said elongation core being placed within said helical spring, and an outer surface of said helical spring being entirely covered by a synthetic coat;
- a flotage chamber defined between said elongation core and said helical spring being selected from one or two groups consisting of a cell encapsulated by a foamy body, a cell encapsulated by cotton fibers or a bundle of fibers and a cell encapsulated by foamy beads or microballoons.
A method of making a medical guide wire comprising steps of:
- diametrically reducing a distal end portion of an elongation core gradually;
- severing said distal end portion of said elongation core by a predetermined length and pressing said distal end portion into a multi-stepped flat configuration after severing said distal end portion;
- inserting a helical spring into an outer surface of said distal end portion of said elongation core to fix said helical spring to said elongation core;
- and
- applying a hydrophilic polymer to a synthetic coat by means of a dipping procedure after forming said synthetic coat entirely over an outer surface of said helical spring.
A method of making a medical guide wire comprising steps of:
- diametrically reducing a distal end portion of an elongation core gradually;
- severing said distal end portion of said elongation core into by a predetermined length and pressing said distal end portion into a multi-stepped flat configuration after severing said distal end portion;
- inserting a helical spring into an outer surface of said distal end portion of said elongation core to fix said helical spring to said elongation core;
- and
- preparing a synthetic coat from a mixture of a hydrophilic polymer and a hydrophobic polymer, and applying said synthetic coat to said helical spring by means of a dipping procedure so that a mixing ratio of said hydrophilic polymer progressively increases as approaching an outer surface of said synthetic coat.
Dependencies are inferred from the claim text.