Method and apparatus for providing intra-pericardial access
First Claim
1. An apparatus for delivering a medical device to a desired sealed location within a patient'"'"'s body and stabilizing said medical device with respect to an adjacent portion of tissue, such that a distal portion of said medical device must pierce the adjacent portion of tissue to reach said desired location, comprising:
- an elongated device body having a proximal end and a distal end and having an internal, longitudinally extending lumen open to the distal end of the device body; and
a stabilizing mechanism located at the distal end of the;
device body, the stabilizing mechanism in turn comprising;
a tubular elastic member having a proximal end attached to the device body and having a first length and a first circumference in a first configuration;
means for causing the tubular member to change from the first configuration to a second configuration by elastically stretching the tubular elastic member longitudinally to a second length greater than the first length and thereby causing the tubular member to neck down to a second circumference smaller than the first circumference; and
means for causing the tubular elastic member to change from the second configuration to a third configuration having a third length less than the second length and a third circumference greater than the second circumference.
1 Assignment
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Accused Products
Abstract
A method and apparatus for accessing the pericardial space which provides for stable short term or long term placement of a delivery catheter or cannula having its distal most end located in the pericardial space. The catheter or cannula may be introduced into the pericardial space either transvenously through the wall of a heart chamber or transthoracically by penetrating the chest wall and the pericardium. Some embodiments are provided with a mechanism for stabilizing the distal end of the catheter or cannula, which mechanism may employ an extensible elastic, generally tubular member located at the distal end of the catheter or cannula. The device may be provided with a mechanism for extending the tubular member longitudinally, causing its diameter to diminish substantially. The tubular member may be passed through the wall of the heart or the pericardium in its extended configuration and thereafter, the distal-most portion of the tubular member may be moved proximally, causing its diameter enlarge, anchoring the distal end of the catheter or cannula to the pericardium or to the wall of a heart chamber. In these embodiments, the device is preferably provided with a shoulder or flange located proximal to the extendible tubular member, for location on the opposite side of the heart wall or pericardium from the distal end of the catheter or cannula.
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Citations
19 Claims
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1. An apparatus for delivering a medical device to a desired sealed location within a patient'"'"'s body and stabilizing said medical device with respect to an adjacent portion of tissue, such that a distal portion of said medical device must pierce the adjacent portion of tissue to reach said desired location, comprising:
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an elongated device body having a proximal end and a distal end and having an internal, longitudinally extending lumen open to the distal end of the device body; and
a stabilizing mechanism located at the distal end of the;
device body, the stabilizing mechanism in turn comprising;
a tubular elastic member having a proximal end attached to the device body and having a first length and a first circumference in a first configuration;
means for causing the tubular member to change from the first configuration to a second configuration by elastically stretching the tubular elastic member longitudinally to a second length greater than the first length and thereby causing the tubular member to neck down to a second circumference smaller than the first circumference; and
means for causing the tubular elastic member to change from the second configuration to a third configuration having a third length less than the second length and a third circumference greater than the second circumference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for delivering a medical device to a desired sealed location within a patient'"'"'s body and stabilizing said medical device with respect to an adjacent portion of tissue, such that a distal portion of said medical device must pierce the adjacent portion of tissue to reach said desired location, comprising:
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an outer tube having proximal and distal ends and provided with at least one inwardly directed projection and having a radially extending first flange adjacent its distal end; and
an inner tube located within and longitudinally movable within the outer tube and having proximal and distal ends and having a radially extending second flange adjacent its distal end, located distal to the distal end of the outer tube and provided with at least one outwardly directed projection selectively engageable with the inwardly directed projection of the outer tube and having a radially extending second flange adjacent its distal end, located distal to the distal end of the outer tube;
wherein;
at least one of the inner tube is provided with a plurality of said outwardly directed projections longitudinally spaced apart from one another along the length of the inner tube or the outer tube is provided with a plurality of said inwardly directed projections longitudinally spaced apart from one another along the length of the outer tube such the inwardly and outwardly directed projections may engage one another at multiple locations. - View Dependent Claims (18, 19)
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Specification