Non-invasive gut motility monitor

• US 6,374,670 B1
• Filed: 03/13/1995
• Issued: 04/23/2002
• Est. Priority Date: 03/13/1995
• Status: Expired due to Fees

• Current Assignee: Emerald Medical Products, University of Washington, Washington University In St Louis
• Original Assignee: University of Washington
• Inventors: Nelson, James A., Prakash, N. Mani, Read, Page, Pope, Charles E., Rothermel, James D., Heitkemper, Margaret, Spelman, Francis A.
• Primary Examiner(s): Fuller, Benjamin R.
• Assistant Examiner(s): THOMPSON, JEWEL VERGIE
• Application Number:
  US08/402,872
• Time in Patent Office: 2,598 Days
• Field of Search: 733/790.1, 738/654, 128/780, 128/782, 128/10
• US Class Current: 73/379.01
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/06 Devices, other than using radiation, for detecting or locating foreign bodies for removing same A61B17/50 ; determining position of probes within or on the body of the patient
• CPC Class Codes: A61B 5/062 using magnetic field
• CPC Class Codes: A61B 5/42 Detecting, measuring or recording for evaluating the gastrointestinal, the endocrine or the exocrine systems A61B1/00, A61B5/4857, A61B5/486, A61B5/4866, A61B5/4869 take precedence

Abstract

An apparatus (4) and method of non-invasive monitoring of gut motility. An ingestible magnet (10, M) is swallowed by the patient (12) and then linear and rotational movement is directionally detected by an external compass (14, 16). In preferred form, movements of the magnet (10, M) are recorded by a memory means (18) and graphically presented (20) over a period of predetermined time. An alternate embodiment includes multiple compasses (C1, C2) for directionally locating the magnet (10, M) within the patient (12).

Claims

1. An apparatus for non-invasive monitoring of gut motility in a patient, comprising:

a magnet sized to be ingestible by the patient;

a compass external of the patient directionally sensitive to movement of the magnet in the patient'"'"'s abdomen for monitoring of gut motility according to movements of the ingested magnet.

2. The apparatus of claim 1, wherein the compass is an electronic flux-gate compass having an electronic directional output.

3. The apparatus of claim 2, further comprising a memory means for recording detected movements of the magnet over a predetermined period of time.

4. The apparatus of claim 2, further comprising a recorder for providing a graphic record of the magnet'"'"'s movement over a predetermined period of time.

5. The apparatus of claim 1, further comprising a recorder for providing a graphic record of the magnet'"'"'s movement over a predetermined period of time.

6. The apparatus of claim 1, wherein the magnet has poles spaced apart a sufficient distance such that the compass will measure rotational movement of the magnet within the patient'"'"'s gut.

7. The apparatus of claim 1, further comprising at least a second compass external of the patient directionally sensitive to movement of the magnet in the patient'"'"'s abdomen for calculating location of the magnet within the patient.

8. A method of measuring gut motility in a patient, comprising the steps of:

the patient swallowing an ingestible magnet;

providing a compass external of the patient'"'"'s abdomen for directionally sensing movement of the magnet in the patient; and

monitoring gut motility with the compass by measuring movement of the magnet within the patient.

9. The method of claim 8, wherein the compass is an electronic flux-gate compass having an electronic directional output.

10. The method of claim 9, further comprising the step of recording movements of the magnet sensed by the compass over a predetermined period of time.

11. The method of claim 9, further comprising the step of providing a graphic recorded output of the magnet'"'"'s movement over a predetermined period of time.

12. The method of claim 8, further comprising the step of providing a graphic recorded output of the magnet'"'"'s movement over a predetermined period of time.

13. The method of claim 8, wherein the magnet has poles spaced apart a sufficient distance such that the compass will measure rotational movement of the magnet within the patient'"'"'s gut.

14. The method of claim 8, further comprising the step of providing at least a second compass external of the patient'"'"'s abdomen for, in conjunction with, the first compass, directionally sensing location of the magnet in the patient.