Dual valve, flexible expandable sheath and method
First Claim
Patent Images
1. An introducer sheath assembly comprising:
- an elongate sheath tube formed of a flexible material having proximal and distal extremities and having a passage extending therethrough;
an outer tubular member configured coaxially within said sheath tube, and having a proximal extremity that extends beyond said proximal extremity of said sheath tube and a distal extremity configured to pass through said passage of said elongated sheath tube;
an inner tubular member configured coaxially within said outer tubular member and having proximal and distal extremities that extend beyond said extremities of said outer tubular member; and
a cap affixed to said distal extremity of said inner tubular member.
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Abstract
A sheath assembly for use in introducing a catheter or other medical instrument into a vessel in the body of a patient. The sheath assembly includes an outer tubular member and an inner tubular member with a conically shaped cap at its distal end. A locking mechanism prevents advancement of the inner tubular member and associated cap in a distal direction of the vessel of the patient independent of the outer tubular member, but allows free movement of the inner tubular member in the proximal direction independent of the outer tubular member.
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Citations
16 Claims
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1. An introducer sheath assembly comprising:
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an elongate sheath tube formed of a flexible material having proximal and distal extremities and having a passage extending therethrough; an outer tubular member configured coaxially within said sheath tube, and having a proximal extremity that extends beyond said proximal extremity of said sheath tube and a distal extremity configured to pass through said passage of said elongated sheath tube; an inner tubular member configured coaxially within said outer tubular member and having proximal and distal extremities that extend beyond said extremities of said outer tubular member; and a cap affixed to said distal extremity of said inner tubular member. - View Dependent Claims (2, 3, 4)
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5. An introducer sheath assembly comprising:
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an elongate sheath tube formed of a flexible material having proximal and distal extremities and having a passage extending therethrough; an outer tubular member configured coaxially within said sheath tube and having a proximal extremity that extends beyond said proximal extremity of said elongated sheath tube, and a distal extremity configured to pass through said passage of said elongated sheath tube; an inner tubular member configured coaxially within said outer tubular member and having proximal and distal extremities that extend beyond said extremities of said outer tubular member; and a locking mechanism for restricting distal movement of said inner tubular member; wherein said locking mechanism includes a housing mounted to said proximal end of said outer tubular member, said housing including an inner chamber with an internal distal wall and an internal proximal wall through which said inner tubular member passes. - View Dependent Claims (6, 7, 8)
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9. An expandable introducer sheath assembly comprising:
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an elongate sheath tube formed of a flexible material having proximal and distal extremities and having a passage extending therethrough; an outer tubular member configured coaxially within said sheath tube and having a proximal extremity that extends beyond said proximal extremity of said elongated sheath tube, and a distal extremity configured to pass through said passage of said elongated sheath tube; an inner tubular member configured within said sheath tube and having proximal and distal extremities that extend beyond said extremities of said outer tubular member; a cap affixed to said distal extremity of said inner tubular member; and a locking mechanism for restricting distal movement of said inner tubular member, said locking mechanism being structurally connected to said outer tubular member. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification