Apparatus and method for acoustically guiding, positioning, and monitoring a tube within a body

• US 5,445,144 A
• Filed: 12/16/1993
• Issued: 08/29/1995
• Est. Priority Date: 12/16/1993
• Status: Expired due to Term

• Current Assignee: Purdue Research Foundation (Purdue University)
• Original Assignee: Purdue Research Foundation (Purdue University)
• Inventors: Mansfield, Jeffrey P., Voorhees, William D., Wodicka, George R.
• Primary Examiner(s): Sykes, Angela D.
• Application Number:
  US08/168,992
• Time in Patent Office: 621 Days
• Field of Search: 128/897-899, 128/715, 128/656-658, 128/207.14
• US Class Current: 128/207.14
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/04 Tracheal tubes catheters in general A61M25/00
• CPC Class Codes: A61M 16/0411 with means for differentiating between oesophageal and tracheal intubation
• CPC Class Codes: A61M 16/0463 combined with suction tubes, catheters or the like; Outside connections
• CPC Class Codes: A61M 16/0488 Mouthpieces; Means for guiding, securing or introducing the tubes guiding or introducing with laryngoscopes A61B1/267; holding devices on the body A61M25/02
• CPC Class Codes: A61M 16/202 electrically actuated
• CPC Class Codes: A61M 2205/3375 Acoustical, e.g. ultrasonic, measuring means
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards
• CPC Class Codes: A61M 25/01 Introducing, guiding, advancing, emplacing or holding catheters A61M25/10 takes precedence
• CPC Class Codes: A61M 25/0105 Steering means as part of the catheter or advancing means; Markers for positioning systems for detection of markers A61B

Abstract

An apparatus and method is disclosed for acoustically guiding a distal end of a tube within a body. The apparatus and method generates an incident sound pulse in the tube which propagates into the body, detects sound pulses resulting from the incident sound pulse and from reflected sound pulses from within the body, and processes the detected sound pulses to guide insertion of the distal end of the tube within the body. The apparatus and method provides an indication of the position of the distal end of the tube within the body conduit, estimates dimensions of the body conduit adjacent the distal end of the tube, and determines if the tube is obstructed.

Claims

1. An apparatus for acoustically guiding a distal end of a tube within a body, the apparatus comprising:

a wave guide coupled to a proximal end of the tube;

a mechanical ventilator;

a valve movable from a first position to provide communication between the wave guide and the proximal end of the tube to a second position to provide communication between the mechanical ventilator and the proximal end of the tube;

a speaker coupled to the wave guide for generating an incident sound pulse in the wave guide which propagates into the body;

a microphone coupled to the wave guide between the speaker and the tube for detecting sound pulses moving past the microphone in the wave guide from the incident sound pulse and from reflected sound pulses from within the body; and

means for processing the sound pulses detected by the microphone to guide insertion of the distal end of the tube within the body.

2. The apparatus of claim 1, wherein the processing means includes means for providing an indication of the position of the distal end of the tube within the body.

3. The apparatus of claim 2, further comprising means for monitoring the position of the distal end of the tube within the body, the monitoring means generating a warning signal if the distal end of the tube moves beyond a preset zone.

4. The apparatus of claim 1, wherein the processing means includes means for estimating dimensions of the body adjacent the distal end of the tube.

5. The apparatus of claim 4, further comprising means for generating a warning signal if the dimensions estimated by the estimating means are smaller than dimensions of the distal end of the tube.

6. The apparatus of claim 1, wherein the processing means includes means for determining if the tube is obstructed.

7. The apparatus of claim 6, further comprising means for generating a warning signal if the tube is obstructed by more than a predetermined percentage.

8. The apparatus of claim 1, further comprising an absorptive material coupled to an end of the wave guide for substantially absorbing sound pulses moving toward the end of the wave guide.

9. The apparatus of claim 1, further comprising means for displaying information generated by the processing means.

10. An apparatus for acoustically guiding a distal end of a tube within a body, the apparatus comprising:

means coupled to a proximal end of the tube for generating an incident sound pulse in the tube which propagates into the body;

a mechanical ventilator;

a valve movable from a first position to provide communication between the generating means and the proximal end of the tube to a second position to provide communication between the mechanical ventilator and the proximal end of the tube;

means for detecting sound pulses in the tube resulting from the incident sound pulse and from reflected sound pulses from within the body; and

means for processing the detected sound pulses to guide insertion of the distal end of the tube within the body.

11. The apparatus of claim 10, wherein the processing means includes means for providing an indication of the position of the distal end of the tube within the body.

12. The apparatus of claim 11, further comprising means for monitoring the position of the distal end of the tube within the body, the monitoring means generating a warning signal if the distal end of the tube moves beyond a preset zone.

13. The apparatus of claim 10, wherein the processing means includes means for estimating dimensions of the body adjacent the distal end of the tube.

14. The apparatus of claim 13, further comprising means for generating a warning signal if the dimensions estimated by the estimating means are smaller than dimensions of the distal end of the tube.

15. The apparatus of claim 10, wherein the processing means includes means for determining if the tube is obstructed.

16. The apparatus of claim 15, further comprising means for generating a warning signal if the tube is obstructed by more than a predetermined percentage.

17. The apparatus of claim 10, further comprising an absorptive material coupled to an end of the generating means for substantially absorbing sound pulses moving toward the end of the generating means.

18. The apparatus of claim 10, further comprising means for displaying information generated by the processing means.

19. An apparatus for acoustically guiding placement of a distal end of an endotracheal tube within a respiratory system of a body including a trachea, a right primary bronchus, and a left primary bronchus, the apparatus comprising:

a wave guide having a first end and a second end;

a mechanical ventilator;

a valve having a first inlet coupled to the first end of the wave guide and a second inlet coupled to the mechanical ventilator, the valve being movable from a first position to provide communication between the wave guide and the proximal end of the tube to a second position to provide communication between the mechanical ventilator and the proximal end of the tube;

a speaker coupled to the wave guide for generating an incident sound pulse in the wave guide which propagates into the body when the valve is in its first position;

a microphone coupled to the wave guide between the speaker and the first end of the wave guide for detecting sound pulses moving past the microphone in the wave guide from the incident sound pulse and reflected sound pulses from within the body; and

means for processing the sound pulses detected by the microphone to guide proper positioning of the tube in the trachea.

20. The apparatus of claim 19, wherein the processing means includes means for providing an indication of the position of the distal end of the tube within the body.

21. The apparatus of claim 19, wherein the processing means includes means for generating a warning signal if the distal end of the tube is inserted into one of the an esophagus, the right primary bronchus, and the left primary bronchus.

22. The apparatus of claim 19, wherein the processing means includes means for estimating dimensions of the body adjacent the distal end of the tube.

23. The apparatus of claim 22, wherein the processing means includes means for generating a warning signal if the dimensions estimated by the estimating means are smaller than dimensions of the distal end of the tube.

24. The apparatus of claim 19, wherein the processing means includes means for determining if the tube is obstructed and means for generating a warning signal if the tube is obstructed by more than a predetermined percentage.

25. The apparatus of claim 19, further comprising an absorptive material coupled to the second end of the wave guide for substantially absorbing sound pulses moving toward the second end of the wave guide.