System and method for measuring fluidics in arteries
First Claim
1. A method for measuring blood velocity and derived indices related to blood velocity in an umbilical artery of a neonatal patient, comprising:
- inserting into the umbilical artery an elongated catheter body having a proximal end and a distal end so that the distal end is located at a desired location in the umbilical artery for measuring the blood velocity, said elongated catheter body defining a conduit therein, said desired location being close to a patent ductus arteriosus of the neonatal patient;
positioning an end of a Doppler catheter near the proximal end of the elongated catheter body, wherein the Doppler catheter includes a Doppler transducer, a wire connected to the Doppler transducer, and a sleeve that provides a sealed environment for the Doppler transducer and the wire when the Doppler transducer and/or the wire is in a first position outside the conduit, when the Doppler transducer is in a second position at said desired location, and when the Doppler transducer is in a position between the first position and the second position;
thereafter inserting into the conduit, at the proximal end of the elongated catheter body, the Doppler transducer and the wire so that the Doppler transducer passes through, and extends outside, the conduit at the distal end, to be located at said desired location, thereby folding the sleeve;
performing continuously ultrasound measurement of the blood velocity in the umbilical artery at said desired location using the Doppler transducer to measure antegrade and retrograde blood velocity in the umbilical artery; and
continuously displaying, in real time, information related to the blood velocity in the umbilical artery.
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Accused Products
Abstract
An apparatus for performing measurements in an artery includes a Doppler catheter, comprising a Doppler transducer and a wire connected to the Doppler transducer; and an elongated catheter body having a conduit therein for housing the wire of the Doppler catheter. The body has a proximal end and a distal end; wherein the wire is movable in the conduit relative to the catheter body so that the Doppler transducer and the wire are capable of being threaded into said conduit at the proximal end after the distal end of the catheter has been inserted into the artery, until the Doppler transducer emerges outside the conduit at the distal end of said body for performing ultrasound measurements in the artery. Another embodiment employs at least an additional side transducer for measuring the cross-sectional dimension of the artery useful for computing blood flow.
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Citations
20 Claims
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1. A method for measuring blood velocity and derived indices related to blood velocity in an umbilical artery of a neonatal patient, comprising:
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inserting into the umbilical artery an elongated catheter body having a proximal end and a distal end so that the distal end is located at a desired location in the umbilical artery for measuring the blood velocity, said elongated catheter body defining a conduit therein, said desired location being close to a patent ductus arteriosus of the neonatal patient; positioning an end of a Doppler catheter near the proximal end of the elongated catheter body, wherein the Doppler catheter includes a Doppler transducer, a wire connected to the Doppler transducer, and a sleeve that provides a sealed environment for the Doppler transducer and the wire when the Doppler transducer and/or the wire is in a first position outside the conduit, when the Doppler transducer is in a second position at said desired location, and when the Doppler transducer is in a position between the first position and the second position; thereafter inserting into the conduit, at the proximal end of the elongated catheter body, the Doppler transducer and the wire so that the Doppler transducer passes through, and extends outside, the conduit at the distal end, to be located at said desired location, thereby folding the sleeve; performing continuously ultrasound measurement of the blood velocity in the umbilical artery at said desired location using the Doppler transducer to measure antegrade and retrograde blood velocity in the umbilical artery; and continuously displaying, in real time, information related to the blood velocity in the umbilical artery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for measuring blood velocity in an artery, comprising:
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inserting into the artery an elongated catheter body having a proximal end and a distal end so that the distal end is located at a desired location in the artery for measuring the blood velocity, said elongated catheter body defining a conduit therein; positioning an end of a Doppler catheter near the proximal end of the elongated catheter body, wherein the Doppler catheter includes a Doppler transducer, a wire connected to the Doppler transducer, and a sleeve that provides a sealed environment for the Doppler transducer and the wire when the Doppler transducer and/or the wire is in a first position outside the conduit, when the Doppler transducer is in a second position at said desired location, and when the Doppler transducer is in a position between the first position and the second position; thereafter inserting into the conduit, at the proximal end of the elongated catheter body, the Doppler transducer and the wire so that the Doppler transducer passes through, and extends outside, the conduit at the distal end, to be located at said desired location, thereby folding the sleeve; performing continuously ultrasound measurement of the blood velocity in the artery at said desired location using the Doppler transducer; and continuously displaying, in real time, information related to blood velocity in the artery and systolic time intervals. - View Dependent Claims (14, 15, 16)
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17. A method for performing measurements in an artery, comprising:
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inserting into the artery an elongated catheter body having a proximal end and a distal end so that the distal end is located at a desired location in the artery for measuring blood velocity, said elongated catheter body defining a conduit therein; positioning an end of a Doppler catheter near the proximal end of the elongated catheter body, wherein the Doppler catheter includes a Doppler transducer, a wire connected to the Doppler transducer, and a sleeve that provides a sealed environment for the Doppler transducer and the wire when the Doppler transducer and/or the wire is in a first position outside the conduit, when the Doppler transducer is in a second position at said desired location, and when the Doppler transducer is in a position between the first position and the second position; thereafter inserting into the conduit at the proximal end of the elongated catheter body, the Doppler transducer, a second transducer, wires connected to the Doppler transducer and the second transducer and a first connector so that the Doppler and the second transducers pass through and extend outside the conduit at the distal end, to be located at said desired location, thereby folding the sleeve; and performing ultrasound measurement of the blood velocity in the artery and a dimension of the artery at said desired location using the Doppler transducer and the second transducer. - View Dependent Claims (18, 19, 20)
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Specification