Endoscopic catheter sheath position control
First Claim
1. A catheter assembly comprising:
- an elongated, flexible, tubular sheath having a distal end and a proximal end;
a distal end member internal to the sheath and reciprocally axially moveable relative to the sheath distal end between a retracted position proximal of the sheath distal end and an extended position in which the end member protrudes beyond the sheath distal end;
an elongated end member interconnector having a distal end and a proximal end, the interconnector distal end being connected to the end member and the interconnector proximal end being connected to a position actuator for axially reciprocating the end member relative to the sheath distal end;
a self acting distal end position controller located at a point along the sheath to self-actively cooperate with the end member interconnector in limiting the extent of axial retraction of the end member relative to the sheath distal end; and
a flow channel internal to the sheath and external to the end member interconnector, the flow channel extending axially through the distal end position controller.
3 Assignments
0 Petitions
Accused Products
Abstract
An endoscopic catheter distal end position control that enables precise control of distal catheter sheath ends relative to each other while accommodating the long length and flexibility of typical catheters and proximal, remote hand-operable control mechanisms. In a catheter assembly employing this control, an elongated flexible tubular sheath is provided having a distal end and a proximal end. A distal end member is internal to the sheath; this end member is reciprocally axially moveable relative to the sheath distal end between a retracted position that is proximal of the sheath distal end and an extended position in which the end member protrudes beyond the sheath distal end. An elongated end member interconnector is provided, with a distal end of the interconnector being connected to the end member and a proximal end of the interconnector being connected to a position actuator for axially reciprocating the end member relative to the distal end of the sheath. A distal end position controller is located at a point along the sheath to cooperate with the interconnector in limiting the extent of axial retraction of the end member relative to the sheath distal end. A flow channel that extends axially through the end position controller is internal to the sheath and external to the interconnector.
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Citations
17 Claims
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1. A catheter assembly comprising:
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an elongated, flexible, tubular sheath having a distal end and a proximal end; a distal end member internal to the sheath and reciprocally axially moveable relative to the sheath distal end between a retracted position proximal of the sheath distal end and an extended position in which the end member protrudes beyond the sheath distal end; an elongated end member interconnector having a distal end and a proximal end, the interconnector distal end being connected to the end member and the interconnector proximal end being connected to a position actuator for axially reciprocating the end member relative to the sheath distal end; a self acting distal end position controller located at a point along the sheath to self-actively cooperate with the end member interconnector in limiting the extent of axial retraction of the end member relative to the sheath distal end; and a flow channel internal to the sheath and external to the end member interconnector, the flow channel extending axially through the distal end position controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An injection catheter assembly comprising:
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an elongated, flexible, tubular sheath having a distal end and a proximal end; a needle cannula internal to the sheath and having a distal tip, the needle cannula tip being reciprocally axially moveable relative the sheath distal end between a retracted position proximal of the sheath distal end whereby the sheath covers the needle tip and an extended position whereby the needle tip protrudes beyond the sheath distal end; an elongated, flexible tube internal to the sheath and having a distal end and a proximal end, the tube distal end being connected to the needle cannula by a needle connector and the tube proximal end being connected to a position actuator for axially reciprocating the needle tip relative to the sheath distal end; and a self acting distal end position controller located at a point along the sheath to self actively cooperate with the needle connector in limiting the extent of axial retraction of the needle tip relative to the sheath distal end. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A syringe comprising:
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a barrel having a distal end and a proximal end; a needle cannula having a distal tip, the needle cannula tip being located internal to the barrel and being reciprocally axially moveable relative to the barrel distal end between a retracted position proximal of the barrel distal end whereby the barrel covers the needle tip and an extended position whereby the needle tip protrudes beyond the barrel distal end; a needle plunger rod internal to the barrel and having a distal end and a proximal end, the rod distal end being connected to the needle cannula and the rod proximal end being connected to a position actuator for axially reciprocating the needle tip relative to the barrel distal end; and a self acting distal end position controller located at a point along the barrel to self actively cooperate with the plunger rod in limiting the extent of axial retraction of the needle tip relative to the barrel distal end, the location of the controller corresponding to a fully retracted needle tip position. - View Dependent Claims (17)
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Specification