Catheter for intravascular pressure measurement
First Claim
1. A catheter for intravascular pressure measurement having a proximal end and a distal end, comprising:
- an outer and inner sheath and a leader moving in the inner sheath, wherein at least the inner sheath in a partial section portion is more elastic than the rest of the sheath;
said sheaths being joined together at the distal end of the catheter to form an outer cavity which is connectable to an outside pressure source with the aide of a first connection at the proximal end of the catheter;
a pressure transducer arranged at the leader; and
said partial section portion being resilient, such that when a pressure is applied from the outside pressure source, it forms a seal around the leader.
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Accused Products
Abstract
The invention relates to a catheter for intravascular pressure measurement. The catheter includes a leader (3) with a transducer (4). The leader is surrounded by an inner sheath (2) with a reduced partial section portion (6) and by an outer sheath (1) arranged around the inner sheath. An end closure (5) joins the outer and inner sheath to each other at the distal end of the catheter to form an outer cavity (9), intended to be pressurized by an outside pressure source, whereby the attenuated partial section sealingly surrounds the leader or transducer (4). Pressure calibration in situ is enabled with the aid of the inventive catheter.
74 Citations
22 Claims
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1. A catheter for intravascular pressure measurement having a proximal end and a distal end, comprising:
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an outer and inner sheath and a leader moving in the inner sheath, wherein at least the inner sheath in a partial section portion is more elastic than the rest of the sheath; said sheaths being joined together at the distal end of the catheter to form an outer cavity which is connectable to an outside pressure source with the aide of a first connection at the proximal end of the catheter; a pressure transducer arranged at the leader; and said partial section portion being resilient, such that when a pressure is applied from the outside pressure source, it forms a seal around the leader. - 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. The method of in situ calibration of a transducer of an intravascular pressure transducer while in a blood vessel or the like, comprising:
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(a) providing inner and outer sheaths, a movable leader positioned within the inner sheath, and a pressure transducer on the leader; (b) forming a portion of the inner sheath with a greater elasticity than the remainder of the inner sheath; (c) joining the inner and outer sheaths at a distal end of each thereby forming an outer cavity; (d) connecting the outer cavity to a first source of pressure; (e) forming a seal on said leader by applying pressure to the pressure source and attenuating the elastic portion. - View Dependent Claims (20, 21, 22)
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Specification