Catheter guidewire
First Claim
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1. A guidewire for use in positioning an elongated tubular catheter within a subject comprising:
- (a) an elongated flexible core member longer than the tubular catheter and including a ball shaped tip at a distal end;
(b) a tightly coiled wire sheath surrounding a substantial length of said elongated flexible core member and having an outer diameter small enough to be inserted within the tubular catheter and an inner diameter at a distal end less than the ball shaped tip of said core member to prevent movement of the ball shaped tip into the coiled wire sheath, said flexible core member rotatable with respect to the tightly coiled wire sheath; and
,(c) means at a proximal end of said elongated flexible core member for rotating the flexible core member relative to the tightly coiled wire sheath to orient a distal end of said guidewire as the guidewire is moved within the subject.
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Abstract
A catheter guidewire for use in inserting a catheter into a subject. The guidewire includes a center wire core surrounded by a coiled wire sheath that is Teflon coated on an outside surface. The extreme distal end of the rod widens to a sphere. The rod and sheath are pre-bent to a desired form. As the core is rotated inside the sheath, the distal end of the guidewire is re-oriented in the direction of rotation.
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Citations
11 Claims
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1. A guidewire for use in positioning an elongated tubular catheter within a subject comprising:
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(a) an elongated flexible core member longer than the tubular catheter and including a ball shaped tip at a distal end; (b) a tightly coiled wire sheath surrounding a substantial length of said elongated flexible core member and having an outer diameter small enough to be inserted within the tubular catheter and an inner diameter at a distal end less than the ball shaped tip of said core member to prevent movement of the ball shaped tip into the coiled wire sheath, said flexible core member rotatable with respect to the tightly coiled wire sheath; and
,(c) means at a proximal end of said elongated flexible core member for rotating the flexible core member relative to the tightly coiled wire sheath to orient a distal end of said guidewire as the guidewire is moved within the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A guidewire for positioning a tubular catheter within a subject comprising:
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(a) an elongated flexible core member including a ball shaped tip at a distal end, said core member having a tapered portion at a distal region near the ball shaped tip; (b) a tightly coiled wire sheath surrounding a substantial length of said elongated flexible member having an outer diameter small enough to be inserted within the tubular catheter and defining a tapered region along the tapered portion of the core member that defines an inner diameter less than an outer diameter of the ball shaped tip of the core member; and
,(c) means for rotating a proximal end of said elongated flexible member within the sheath to orient a distal end of said guidewire as the guidewire is moved within the subject. - View Dependent Claims (10, 11)
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Specification