Longitudinal multiplane ultrasound transducer underfluid catheter system

• US 5,699,805 A
• Filed: 06/20/1996
• Issued: 12/23/1997
• Est. Priority Date: 06/20/1996
• Status: Expired due to Term

• Current Assignee: Mayo Foundation For Medical Education And Research (Mayo Clinic)
• Original Assignee: Mayo Foundation For Medical Education And Research (Mayo Clinic)
• Inventors: Tajik, Abdul Jamil, Seward, James Bernard
• Primary Examiner(s): Lateef, Marvin M.
• Assistant Examiner(s): FIELDS, DERRICK LAMAR
• Application Number:
  US08/668,103
• Time in Patent Office: 551 Days
• Field of Search: 128/662.06, 128/662.03, 128/661.01, 128/660.08, 128/916
• US Class Current: 600/459
• CPC Class Codes: A61B 8/12 in body cavities or body tracts, e.g. by using catheters catheters per se A61M25/00
• CPC Class Codes: A61B 8/145 characterised by scanning multiple planes
• CPC Class Codes: A61B 8/445 Details of catheter construction
• CPC Class Codes: A61B 8/4461 Features of the scanning mechanism, e.g. for moving the transducer within the housing of the probe
• CPC Class Codes: A61B 8/4488 the transducer being a phased array
• CPC Class Codes: A61B 8/483 involving the acquisition of a 3D volume of data

Abstract

An underfluid imaging, diagnostic, interventional, or measuring catheter apparatus including an outer catheter body and a drive shaft receivable in the outer body and rotatable with respect to the outer body; an ultrasound transducer array mounted on the rotatable drive shaft and rotated with the drive shaft; and a ultrasound window portion disposed on the outer body, wherein the ultrasound transducer array is longitudinally positionable within the outer body proximate the window portion so as to allow transmission of ultrasound signals from the transducer array to the outside of the catheter. The ultrasound signals are a sequential set of spatially related tomographic image planes which define a volumetric field of view around the catheter. An underfluid therapeutic or diagnostic device can be received in the catheter through a port extending from proximate a proximal end to proximate a distal end of the catheter. The device is operated in the volumetric field of view which provides a real time image of the operation.

Claims

1. A catheter apparatus, comprising:

a catheter including an outer body and a drive shaft receivable in the outer body and rotatable with respect to the outer body;

a transducer phased array mounted on the drive shaft, the transducer phased array being rotatable with the drive shaft, the transducer phased array transmitting signals toward outside of the catheter; and

the outer body having an ultrasound window portion at least partially transparent to the signals, the transducer phased array being longitudinally positionable within the outer body proximate the window portion.

2. A catheter apparatus according to claim 1, wherein when the transducer phased array transmits ultrasound signals, a sequential set of spatially related tomographic image planes are formed which define a volumetric field of view around the catheter.

3. A catheter apparatus according to claim 2, further comprising a port disposed in the catheter and extending from proximate a proximal end to proximate a distal end of the catheter for receiving medical instrumentation, the medical instrumentation being extended out of the port and operable within the volumetric field of view.

4. A catheter apparatus according to claim 3, wherein the sequential set of spatially related tomographic image planes substantially overlap with each other to provide an image area having a toroid shape.

5. A catheter apparatus according to claim 1, wherein the ultrasound window portion is disposed about an entire circumference of the catheter.

6. A catheter apparatus in accordance with claim 1, further comprising a guidewire port which is disposed in the drive shaft extending from proximate a proximal end to proximate a distal end of the catheter for receiving a guide wire.

7. A catheter apparatus in accordance with claim 1, wherein the transducer phased array is an ultrasound transducer array, the ultrasound transducer array being aligned generally along a longitudinal axis of the catheter.

8. A catheter apparatus in accordance with claim 1, wherein the transducer phased array is rotatable over 360°

so as to provide a 360°

image radially around the catheter.

9. A catheter apparatus, comprising:

a catheter including a catheter body having a longitudinal axis;

an ultrasonic transducer phased array mounted on the catheter body and oriented so as to extend longitudinally along the catheter, the transducer phased array being constructed and arranged for transmitting an ultrasonic signal radially outward from the catheter body; and

image rotating structure for controlling a radial direction in which the ultrasound signal is transmitted from the ultrasonic transducer phased array, wherein the image rotating structure is constructed and arranged to rotate the radial direction in which the ultrasound signal is transmitted about the longitudinal axis of the catheter body without rotating the catheter body.

10. The catheter apparatus of claim 9, wherein the image rotating structure comprises a drive shaft rotatably mounted within the catheter body, the drive shaft being constructed and arranged for rotating the transducer phased array with respect to the catheter body about the longitudinal axis of the catheter body.

11. The catheter apparatus of claim 10, further comprising means for precisely controlling the rotation of the drive shaft.

12. The catheter apparatus of claim 10, wherein the image rotating structure comprises a control circuit.

13. The catheter apparatus of claim 9, wherein the catheter body includes an ultrasound window that covers the transducer phased array.

14. The catheter apparatus of claim 9, wherein the transducer phased array is rotatable over 360°

so as to provide a 360°

image radially around the catheter.

15. A method of imaging a cavity, comprising the steps of:

providing a catheter having a longitudinal axis and a transducer phased array mounted on the catheter and extending along the longitudinal axis;

positioning the catheter in the cavity;

generating a plurality of spatially related and radially spaced ultrasonic images around at least a portion of a circumference of the catheter without physically rotating the catheter.

16. The method of claim 15, further comprising the step of merging the ultrasonic images to form a volumetric image.

17. The method of claim 15, wherein the ultrasonic images are positioned around the entire circumference of the catheter.

18. The method of claim 17, further comprising the step of merging the ultrasonic images to form a toroidal image.

19. The method of claim 15, wherein the transducer phased array is rotatable over 360°

so as to provide a 360°

image radially around the catheter.