Hollow curved superelastic medical needle and method
First Claim
1. A needle assembly, comprising:
- a non-coring coaxial needle assembly including an outer needle cannula and an introducer stylet receivable coaxially within the outer needle cannula;
the outer needle cannula having a lumen and a first distal tip, the first distal tip having a bevel;
the introducer stylet having a second distal tip, the second distal tip having a bevel;
a first hub attached to the outer needle cannula;
a second hub attached to the introducer stylet; and
wherein the second hub is adapted to lock to the first hub so as to maintain the introducer stylet coaxially received within the outer needle cannula with the bevel of the first tip aligned with the bevel of the second tip.
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Accused Products
Abstract
A needle assembly 10 compromising an infusion needle 11 that includes a needle cannula 13 made of a superelastic material such as Nitinol. The needle cannula is cold-worked or heat annealed to produce a preformed bend 16 that can be straightened within passageway 21 of a coaxial outer cannula 12 for introduction into the body of a patient. Upon deployment from the outer cannula, the needle cannula substantially returns to the preformed configuration for the introduction or extraction of materials at areas lateral to the entry path of the needle assembly. The needle assembly can compromise a plurality of needle cannulae than can be variably arranged or configured for attaining a desired infusion pattern.
95 Citations
14 Claims
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1. A needle assembly, comprising:
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a non-coring coaxial needle assembly including an outer needle cannula and an introducer stylet receivable coaxially within the outer needle cannula; the outer needle cannula having a lumen and a first distal tip, the first distal tip having a bevel; the introducer stylet having a second distal tip, the second distal tip having a bevel; a first hub attached to the outer needle cannula; a second hub attached to the introducer stylet; and wherein the second hub is adapted to lock to the first hub so as to maintain the introducer stylet coaxially received within the outer needle cannula with the bevel of the first tip aligned with the bevel of the second tip. - View Dependent Claims (2)
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3. A method for delivering material to an inner region of a vertebral body, comprising:
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advancing an inner needle through a substantially straight outer needle cannula having a distal opening within the vertebral body, the inner needle having a lumen and a preformed bend portion which, in an unconstrained condition, defines a bend proximate to a distal tip portion of the inner needle;
wherein during said advancing the preformed bend portion of the inner needle is constrained to a substantially straight configuration while received within the outer needle cannula;causing the preformed bend portion of the inner needle to exit the distal opening of the outer needle cannula so as to no longer be constrained by the outer needle cannula and advance in a path that diverges from the longitudinal axis of the outer needle cannula; and delivering material into the vertebral body from the lumen of the inner needle. - View Dependent Claims (4, 5, 6, 7, 8)
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9. A method for providing access to an inner region of a vertebral body to deliver material to the inner region, comprising:
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penetrating the vertebral body with a substantially straight, non-coring coaxial needle assembly including an outer needle cannula having a longitudinal axis and a stylet coaxially received within the outer needle cannula; removing the stylet from the outer needle cannula so as to leave a distal tip of the outer needle cannula within the vertebral body; advancing an inner needle through the outer needle cannula, the inner needle having a lumen and a preformed bend portion which, in an unconstrained condition, defines a bend proximate to a distal tip portion of the inner needle;
wherein during said advancing the preformed bend portion of the inner needle is constrained to a substantially straight configuration while received within the outer needle cannula; andcausing the preformed bend portion of the inner needle to exit a distal opening of the outer needle cannula so as to no longer be constrained by the outer needle cannula and advance in a path that diverges from the longitudinal axis of the outer needle cannula. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification