Transseptal puncture apparatus
First Claim
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1. A transseptal puncture device for puncturing the atrial septum of a patient, comprising:
- a solid inner needle configured for placement within a lumen of a needle configured to transverse the septum and moveable beyond the distal end of the needle, the solid inner needle including a proximal portion, an intermediate portion, and a distal portion;
wherein the solid inner needle is formed substantially of Nitinol;
wherein the intermediate portion is more flexible than the proximal portion and has a circumference equal to that of the proximal portion;
wherein the distal portion is generally curved, is more flexible than the proximal portion, and includes a tip configured to pierce the atrial septum; and
wherein the distal portion has sufficient stiffness such that it is configured to penetrate the atrial septum when the distal portion substantially resides within the needle and has insufficient stiffness such that it is configured to not penetrate cardiac tissue when the distal portion resides substantially outside of the needle.
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Abstract
Devices and methods for performing a transeptal puncture procedure are described. In certain embodiments, the device includes a blunt outer needle, and a second inner needle disposed longitudinally through the lumen of the outer needle, wherein the inner needle is flexible, e.g., has a flexible portion and/or a bend or other non-traumatic conformation at its tip.
306 Citations
26 Claims
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1. A transseptal puncture device for puncturing the atrial septum of a patient, comprising:
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a solid inner needle configured for placement within a lumen of a needle configured to transverse the septum and moveable beyond the distal end of the needle, the solid inner needle including a proximal portion, an intermediate portion, and a distal portion; wherein the solid inner needle is formed substantially of Nitinol; wherein the intermediate portion is more flexible than the proximal portion and has a circumference equal to that of the proximal portion; wherein the distal portion is generally curved, is more flexible than the proximal portion, and includes a tip configured to pierce the atrial septum; and wherein the distal portion has sufficient stiffness such that it is configured to penetrate the atrial septum when the distal portion substantially resides within the needle and has insufficient stiffness such that it is configured to not penetrate cardiac tissue when the distal portion resides substantially outside of the needle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A transseptal puncture device for puncturing the atrial septum of a patient, comprising:
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a solid inner needle configured for placement within a lumen of a needle configured to transverse the septum and moveable beyond the distal end of the needle, the solid inner needle including a proximal portion, an intermediate portion, and a distal portion; wherein the solid inner needle is formed substantially of Nitinol; wherein the intermediate portion is more flexible than the proximal portion and has a circumference equal to that of the proximal portion; wherein the distal portion is generally curved, is generally thinner than the intermediate portion, and includes a tip configured to pierce the atrial septum; wherein the distal portion has sufficient stiffness such that it is configured to penetrate the atrial septum when the distal portion substantially resides within the needle and has insufficient stiffness such that it is configured to not penetrate cardiac tissue when the distal portion resides substantially outside of the needle; and wherein at least part of the distal portion is substantially ellipsoidal. - View Dependent Claims (20, 21)
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22. A transseptal puncture device for puncturing the atrial septum of a patient, comprising:
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a solid inner needle configured for placement within a lumen of a needle configured to transverse the septum and moveable beyond the distal end of the needle; wherein the solid inner needle includes a proximal portion, an intermediate portion, and a distal portion having a tip configured to pierce the atrial septum; wherein the solid inner needle is formed substantially of Nitinol; wherein the intermediate portion is more flexible than the proximal portion and has a circumference equal to that of the proximal portion; wherein the distal portion has sufficient stiffness such that it is configured to penetrate the atrial septum when the distal portion substantially resides within the needle and has insufficient stiffness such that it is configured to not penetrate cardiac tissue when the distal portion resides substantially outside of the needle; and wherein the distal portion has a central axis biased in a curved configuration to define a distal curve such that the solid inner needle forms a curved configuration when at least part of the distal portion extends beyond the distal end of the needle and assumes a generally straight configuration when the distal portion resides within the lumen of the needle. - View Dependent Claims (23, 24, 25, 26)
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Specification