Cannula retention device
First Claim
Patent Images
1. A fixation apparatus to hold an object to an opening in a body wall, comprising:
- an elongated tube defined by an inner and outer surface and having a proximal end and a distal end;
at least one gripping member formed to store a force when in a restrained position, attached to the outer surface of said tube;
a sleeve slidably mounted over said tube, wherein said gripping member is restrained when said sleeve is in a first position and said gripping member is unrestrained when said sleeve is in a second position, releasing said stored force, allowing said gripping member to move toward the body wall.
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Abstract
The invention relates to a cannula with a fixation mechanism actuable to secure the cannula above and below the body wall with minimal amount of manipulation and damage to the body wall. The preferred embodiment involves arms attached to springs secured to the body of the cannula over which a sleeve is slidingly mounted to restrain and release the springs. When the spring is released, it causes the arms to press against the inner body wall to fixate the cannula. A stop mounted on the sleeve can be positioned to apply a compressive force on the outer body wall, further securing the cannula.
299 Citations
22 Claims
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1. A fixation apparatus to hold an object to an opening in a body wall, comprising:
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an elongated tube defined by an inner and outer surface and having a proximal end and a distal end; at least one gripping member formed to store a force when in a restrained position, attached to the outer surface of said tube; a sleeve slidably mounted over said tube, wherein said gripping member is restrained when said sleeve is in a first position and said gripping member is unrestrained when said sleeve is in a second position, releasing said stored force, allowing said gripping member to move toward the body wall. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A fixation apparatus to hold an object to a body opening, said body opening having an inner and outer body wall, comprising:
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an elongated tube defined by an inner and outer surface and having a proximal end and a distal end, wherein said tube has at least one slot; at least one outwardly biased member attached to the outer surface of said tube, wherein said member selectively applies a force to the body wall; a sleeve slidably mounted over said tube, wherein said at least one member is restrained at least in part in said slot and against said outward bias when said sleeve is in a first position and said member is unrestrained, allowing said outward bias to move said member toward a body wall when said sleeve is in a second position. - View Dependent Claims (9, 10, 11, 12)
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13. A method for securing an object to an opening in a body wall, comprising the steps of:
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restraining at least one member against a tube in a manner where the restraint causes potential energy to be stored in the member; inserting the tube into the opening; and releasing said member to allow the potential energy in said member to be converted to kinetic energy to expand the member outwardly. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A fixation apparatus to hold an object to an opening in a body wall, comprising:
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an elongated tube defined by an inner and an outer surface and having a proximal end and a distal end; at least one member to selectively apply a force to the body wall, attached to said tube; and said member further comprising pad means for distributing said force to the body wall, operable in at least two positions, wherein said pad means is substantially flush with said tube in a first position and said pad means selectively expands outwardly in a second position. - View Dependent Claims (20, 21, 22)
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Specification