Catheter with coiled tip
First Claim
1. A catheter for insertion into a living vessel comprising:
- an elongated tube formed of a flexible elastomeric material and having a proximal end and a distal end, an elongated wire member extending longitudinally within the tube from the proximal end of the tube to the distal end and providing rigidity to the catheter to aid in guiding insertion of the catheter into and through the living vessel,a coil section on said catheter movable between a first insertion position and a second operative position, said coil section being extended to the insertion position by extension of the wire member to decrease the diameter of the coil portion for insertion into and through the living vessel;
said coil section being expanded in diameter and into the coiled operative position upon relaxation of the straightening force applied to the coil section by the wire member, andan elongated hollow passage way in said tube to receive fluid pressure to stiffen the coil section.
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Accused Products
Abstract
A catheter is provided with a coil section at the distal end which is stretched initially into a generally linear insertion position for moving inwardly a vessel, such as a blood vessel, to an operative location at which the coil section is re-formed with a larger diameter, preferably in the form of a hollow conical scoop to scoop clot material from the blood vessel. The coil section is stretched into the general linear insertion configuration by an internal wire which may be removed leaving a hollow passageway in the tube which can be stiffened by the application of fluid pressure such as a liquid to stiffen the coils. This assists in pulling the clot material from the vessel as the elastomeric material of the coils slides across the blood vessel walls without damaging the same. The preferred embodiment has two separate wire members associated with the flexible elastomeric tube of the catheter.
1002 Citations
16 Claims
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1. A catheter for insertion into a living vessel comprising:
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an elongated tube formed of a flexible elastomeric material and having a proximal end and a distal end, an elongated wire member extending longitudinally within the tube from the proximal end of the tube to the distal end and providing rigidity to the catheter to aid in guiding insertion of the catheter into and through the living vessel, a coil section on said catheter movable between a first insertion position and a second operative position, said coil section being extended to the insertion position by extension of the wire member to decrease the diameter of the coil portion for insertion into and through the living vessel; said coil section being expanded in diameter and into the coiled operative position upon relaxation of the straightening force applied to the coil section by the wire member, and an elongated hollow passage way in said tube to receive fluid pressure to stiffen the coil section. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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- 8. A catheter for insertion into a living vessel comprising an elongated tube formed of a flexible elastomeric material and having a proximal end and a distal end, an elongated wire member extending longitudinally within the tube from the proximal end of the tube to the distal end and providing rigidity to the catheter to aid in guiding insertion of the catheter into and through the living vessel, a coiled distal end section on said catheter movable between a first insertion position and a second operative position, said coiled section being extended to the insertion position by extension of the wire member to decrease the diameter of the coiled section for insertion into and through the living vessel, the coil expanding in diameter and into the coiled operative position and a second wire member connected to the distal end of the elongated tube to be pushed or pulled to change the diameter of the coils in the coiled section.
- 11. A catheter for insertion into a living vessel comprising a needle having a sharpened end for incision into the vessel, a catheter body of tubular shape within the needle and having first and second bores therein, an elongated tubular member formed of a flexible elastomeric material and having a proximal end extending through a first bore in the catheter body and having a remote distal end, an elongated wire member extending longitudinally within the tubular body from the proximal end to the distal end and providing rigidity to the tubular member to aid in guiding insertion of the latter into and through the living vessel, a coiled distal end portion on said tubular member movable between a first insertion position and a second operative position, said coiled portion being extended to the insertion position by extension of the wire member to decrease the diameter of the coiled portion for insertion into and through the living vessel, the coiled expanding in diameter and into the coiled operative position upon relaxation of the straightening force applied to the coiled portion by the wire member.
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15. A catheter for insertion into a living vessel comprising:
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an elongated tube formed of a flexible elastomeric material and having a proximal end and a distal end, an elongated wire member extending longitudinally within the tube from the proximal end of the tube to the distal end and providing rigidity to the catheter to aid in guiding insertion of the catheter into and through the living vessel, a coil section on said catheter movable between a first insertion position and a second operative position, said coil section being extended to the insertion position by extension of the wire member to decrease the diameter of the coil portion for insertion into and through the living vessel; said coil section being expanded in diameter and into the coiled operative position upon relaxation of the straightening force applied to the coil section by the wire member, said wire member being pulled from the elongated tube leaving a passageway; and
means connected to the passageway to apply fluid pressure to the coils to stiffen the same.
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16. A catheter for removal of blood clot material from a blood vessel comprising:
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an elongated tube formed of elastomeric material, said tube being wound at its internal end to define a conical coiled section, said conical coiled section being hollow to form an internal hollow scoop to collect and carry blood clot material when the conical coiled section is pulled in a removal direction, coils of said conical coiled section having a memory to open to an expanded position to form the scoop with coils of elastomeric material expanding to engage and slide along the interior wall of the blood vessel during clot removal and, an elongated wire member extending longitudinally with tube from a proximal to a distal end of the tube, said wire being connected to said coiled section and being movable in a first direction to decrease the diameter of the coiled section for insertion into the blood vessel and to provide rigidity to the catheter for facilitating insertion, said elongated wire member being movable to a second position to allow the coiled section to expand to define the hollow scoop at a location to be cleared of blood clot material.
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Specification