# US 7,485,094 B2 · Methods of diagnosis using pulse volume measurement

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- Number: US 7,485,094 B2
- Document ID: US7485094B2
- Status: Granted
- Kind: B2
- Application number: 10/673,167
- Filed: 2003-09-30
- Published: 2005-03-31
- Granted: 2009-02-03
- Earliest claimed: 2003-09-30
- Assignees: Smithmarks, Inc.
- Inventors: Lloyd Marks; Michael Smith
- Web page: https://patentgrep.com/patent/US7485094B2

## CPC

- A61B 5/412: {Detecting or monitoring sepsis}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

The utility of pulse volume measurement is expanded to detection of many conditions which have previously not been detected or have been detected using more complicated techniques. Such conditions include blood loss, septic shock, cardiogenic shock, neonatal sepsis, patent ductus arteriosus, limb ischemia, intra-aortic balloon pump performance, peripheral vascular disease, congestive heart failure, the effectiveness of vasoactive medications, syncope, dehydration, pre-eclampsia, deep vein thrombosis, thermal injuries, vascular instability due to renal dialysis, compromising of circulation to the hand caused by radial artery harvesting, changes in cardiac output, and hypertension. According to the present invention, such diagnoses can be performed by taking one measurement, by taking measurements over time to detect a change or by taking measurements before and after application of a treatment or stimulus.

## Claims

### Claim 1

A method for detecting peripheral vascular disease in a patient, the method comprising:
(a) taking quantitative pulse volume measurements at a plurality of positions on the patient's limbs through signal averaging; and
(b) from the quantitative pulse volume measurements, detecting the peripheral vascular disease by calculating an area under a pulse volume curve for each of the patient's limbs.

### Claim 2 (depends on 1)

The method of claim 1, wherein steps (a) and (b) are performed both before and after intervention to correct the peripheral vascular disease to determine whether the peripheral vascular disease has recurred.

### Claim 3 (depends on 1)

The method of claim 1, wherein steps (a) and (b) are performed both before and after intervention to correct the peripheral vascular disease to determine an effectiveness of the intervention.

### Claim 4 (depends on 1)

The method of claim 1, wherein step (b) comprises comparing the quantitative pulse volume measurements among the plurality of positions on the patent's limbs.

### Claim 5 (depends on 4)

The method of claim 4, wherein the quantitative pulse measurement are compared for different limbs of the patient.