Method of measuring blood pressure and velocity proximally and distally of a stenosis
First Claim
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1. A method of measuring blood pressure and velocity proximally and distally of a stenosis in a vessel carrying blood, comprising the steps of:
- introducing a guide wire carrying a solid state pressure sensor and a velocity transducer into the vessel, the guide wire having a core wire extending from a proximal region to a distal region of the guide wire, the pressure sensor and the velocity transducer disposed on a distal region of the guide wire, advancing the guide wire to position the pressure sensor and the velocity transducer proximally and distally of the stenosis, and measuring blood pressure and velocity proximally and distally of the stenosis with the pressure sensor and the velocity transducer carried by the guide wire.
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Abstract
A method of measuring blood pressure and velocity proximally and distally of a stenosis in a vessel carrying blood includes the steps of providing a guide wire having both a pressure sensor and a velocity sensor disposed on a distal region of the guide wire, introducing the guide wire into the vessel, advancing the guide wire to position the pressure sensor and the velocity sensor proximally and distally of the stenosis, and measuring the blood pressure and velocity proximally and distally of the stenosis with the pressure sensor and the velocity sensor.
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Citations
28 Claims
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1. A method of measuring blood pressure and velocity proximally and distally of a stenosis in a vessel carrying blood, comprising the steps of:
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introducing a guide wire carrying a solid state pressure sensor and a velocity transducer into the vessel, the guide wire having a core wire extending from a proximal region to a distal region of the guide wire, the pressure sensor and the velocity transducer disposed on a distal region of the guide wire, advancing the guide wire to position the pressure sensor and the velocity transducer proximally and distally of the stenosis, and measuring blood pressure and velocity proximally and distally of the stenosis with the pressure sensor and the velocity transducer carried by the guide wire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
first measuring the blood pressure and velocity proximally of the stenosis, and subsequently measuring the blood pressure and velocity distally of the stenosis.
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7. The method of claim 1 wherein the step of measuring blood pressure and velocity comprises the steps of:
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first measuring the blood pressure and velocity distally of the stenosis, and subsequently measuring the blood pressure and velocity proximally of the stenosis.
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8. The method of claim 1 further comprising the steps of:
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advancing an angioplasty catheter having a balloon thereon over the guide wire to the location of the stenosis, and dilating the stenosis with a balloon.
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9. The method of claim 1 further comprising the step of dilating a balloon carried by the guide wire at the location of the stenosis.
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10. A method of measuring blood pressure proximally and distally of a stenosis in a vessel carrying blood, comprising the steps of:
advancing a guide wire having a core wire extending from a proximal region to a distal region of the guide wire and carrying a solid state pressure sensor disposed on a distal region of the guide wire within the vessel to position the pressure sensor relative to the stenosis, and measuring blood pressure proximally and distally of the stenosis with the pressure sensor, wherein the blood pressure is measured by monitoring changes in a pair of resistive elements which respond oppositely to changes in pressure but are affected in a similar manner by changes in temperature.
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11. A method of measuring blood pressure proximally and distally of a stenosis in a vessel carrying blood, comprising the steps of:
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introducing a guide wire carrying a first pressure sensor into the vessel, introducing a catheter carrying a second pressure sensor into the vessel over the guide wire, advancing the guide wire within the vessel to position the first sensor distally of the stenosis, advancing the catheter within the vessel to position the second sensor proximally of the stenosis, measuring blood pressure distally of the stenosis with the first sensor, and measuring blood pressure proximally of the stenosis with the second sensor. - View Dependent Claims (12, 13, 14)
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15. A method of determining whether an angioplasty procedure is appropriate for treatment of a stenosis in a vessel carrying blood, comprising the steps of:
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advancing a guide wire having a core wire extending from a proximal region to a distal region of the guide wire with a solid state pressure sensor and a velocity transducer disposed on a distal region of the guide wire into the vessel so that the pressure sensor and the velocity transducer are positioned proximally of the stenosis, measuring the pressure and the velocity of the blood in the vessel on the proximal side of the stenosis, advancing the guide wire through the stenosis so that the pressure sensor and the velocity transducer are positioned distally of the stenosis, measuring the pressure and the velocity of the blood in the vessel on the distal side of the stenosis, and determining whether an angioplasty procedure is appropriate for treatment of the stenosis on the basis of the pressure and velocity measurements. - View Dependent Claims (16, 17, 18)
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19. A method of measuring blood pressure and velocity proximally and distally of a stenosis in a vessel carrying blood, comprising the steps of:
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providing a guide wire having both a pressure sensor and a velocity sensor disposed on a distal region of the guide wire, the guide wire having a core wire extending from a proximal region to a distal region of the guide wire, introducing the guide wire into the vessel, advancing the guide wire to position the pressure sensor and the velocity transducer proximally and distally of the stenosis, and measuring blood pressure and velocity proximally and distally of the stenosis with the pressure sensor and the velocity sensor. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
first measuring the blood and velocity proximally of the stenosis, and subsequently measuring the blood pressure and velocity distally of the stenosis.
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24. The method of claim 19 wherein the step of measuring blood pressure and velocity comprises the steps of:
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first measuring the blood pressure and velocity distally of the stenosis, and subsequently measuring the blood pressure and velocity proximally of the stenosis.
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25. The method of claim 19 further comprising the steps of:
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advancing an angioplasty catheter having a balloon thereon over the guide wire to the location of the stenosis, and dilating the stenosis with a balloon.
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26. The method of claim 19 further comprising the step of dilating a balloon carried by the guide wire at the location of the stenosis.
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27. The method of claim 19, wherein the step of advancing the guide wire comprises the steps of positioning both the pressure sensor and the velocity transducer proximally of the stenosis and positioning both the pressure and velocity transducer distally of the stenosis.
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28. The method of claim 27, wherein the step of measuring blood pressure and velocity comprises the steps of measuring both blood pressure and velocity proximally of the stenosis and measuring both blood pressure and velocity distally of the stenosis.
Specification