Multiple transducer delivery device and method
A stenotic lesion can be characterized by measuring both pressure drop across the stenotic lesion and the size of the vessel lumen adjacent the stenotic lesion, both with sensors delivered intravascularly to the stenotic lesion site. The size (e.g., inner diameter, cross-sectional profile) of the vessel lumen adjacent the stenotic lesion can be measured via one or more intravascular ultrasound transducers. Such one or more intravascular ultrasound transducer(s) can be delivered to the site of the stenotic lesion with the same delivery device that carries a pressure transducer.
1. An intravascular transducer delivery device comprising:
a distal sleeve having a guidewire lumen for slidably receiving a medical guidewire;
a proximal portion coupled to the distal sleeve; and
an ultrasound transducer coupled to the distal sleeve and/or the proximal portion, the ultrasound transducer comprising:
an ultrasound ring transmitter; and
an ultrasound ring receiver adjacent the ultrasound ring transmitter, wherein the ultrasound ring receiver includes first, second, and third receiver elements positioned about a circumference of the distal sleeve and/or the proximal portion.
2. The intravascular transducer delivery device of claim 1 , wherein the first receiver element, the second receiver element, and the third receiver element are coupled to the distal sleeve.
3. The intravascular transducer delivery device of claim 1 , wherein the first receiver element, the second receiver element, and the third receiver element are coupled to the distal sleeve.
4. The intravascular transducer delivery device of claim 1 , further comprising a first pressure transducer coupled to the distal sleeve and/or the proximal portion, the first pressure transducer adapted to take a first intravascular fluid pressure measurement and generate a first pressure signal representative of the first intravascular fluid pressure measurement.
5. The intravascular transducer delivery device of claim 4 , wherein the first pressure transducer is a fiber optic pressure transducer.
6. The intravascular transducer delivery device of claim 4 , further comprising:
(i) a second pressure transducer coupled to the distal sleeve and/or the proximal portion, the second pressure transducer adapted to take a second intravascular fluid pressure measurement and generate a second pressure signal representative of the second intravascular fluid pressure measurement,
wherein the second pressure transducer is spaced longitudinally from the first pressure transducer by a distance that corresponds to a stenotic lesion.
7. The intravascular transducer delivery device of claim 4 , wherein the first receiver element, the second receiver element, and the third receiver element are positioned distal to the first pressure transducer.
8. The intravascular transducer delivery device of claim 1 , further comprising one or more transducer conductors in communication with the ultrasound transducer, wherein the one or more transducer conductors are configured to provide a stimulus signal to the ultrasound ring transmitter, and wherein the one or more transducer conductors are adapted to communicate a first ultrasound signal received at the first receiver element, a second ultrasound signal received at the second receiver element, and a third ultrasound signal received at the third receiver element, outside of a patient through the proximal portion.
9. The intravascular transducer delivery device of claim 1 , wherein the one or more transducer conductors comprise a single ultrasound transducer conductor configured to provide the stimulus signal at respective distinct frequencies to the first ultrasound transducer, the second ultrasound transducer, and the third ultrasound transducer and adapted to communicate the first ultrasound signal, the second ultrasound signal, and the third ultrasound signal outside of the patient through the proximal portion.
10. The intravascular transducer delivery device of claim 8 , wherein the first ultrasound signal, the second ultrasound signal, and the third ultrasound signal each comprise distinct frequencies from one another based on respective distinct frequencies of the provided stimulus signal; wherein the first ultrasound signal is representative of a first intravascular distance value, the second ultrasound signal is representative of a second intravascular distance value, and the third ultrasound signal is representative of a third intravascular distance value.
11. The intravascular transducer delivery device of claim 10 , wherein the first intravascular distance value, the second intravascular distance value, and the third intravascular distance value each comprise a radial distance from the first receiver element, the second receiver element, and the third receiver element to a vessel or lesion wall, respectively.