SysToe

A non invasive device for the measurement of systolic blood pressure in the toe.

SysToe significantly improves the reliability of distal blood pressure measurement, especially in diabetic and chronic renal failure patients, since the measurement of ankle pressure and ankle brachial index may be false or impossible in these patients because of medial calcinosis.

As a fully automated, totally non invasive and painless (unlike ankle pressure measurement) technique, systolic pressure measurement with SysToe is easily performed outside the Vascular Lab by Diabetologists, Nephrologists, General Practitioners… for the follow-up of patients with peripheral arterial disease.

SysToe offers a unique solution. As the arteries in the toe are affected later by medial calcification than those in the leg, the toe systolic pressure can be measured to circumvent the problem of medial calcification of the tibial / peroneal arteries using infrared photoplethysmography.

SysToe is an excellent tool for the following applications;

• Assessment and Diagnosis of Peripheral Arterial Disease
• Follow up of patients with diabetes, chronic Renal Failure and the elderly
• Diagnosis of critical Limb Ischemia
• Assessment of the healing potential of ulcers

Benefits

• Affordable
• Fully Automated
• Easy to use and Operator Independent
• Reliable and Accurate
• Fast measurement - toe pressure is displayed within 3 minutes
• Highly sensitive measurements as SysToe is able to measure pressures lower than 20mmHg
• Toe Brachial Index is displayed as well as the Toe Systolic Pressure
• SysToe can be used outside the Vascular lab and by all health professionals
• Non invasive and painless for the patient
• Quick diagnosis
• Improves clinical evaluation of PAD in every day practice

Operating the SysToe

SysToe cleverly employs photoplethysmography (PPG) analysed by a unique patented algorithm designed by Atys Medical.

Light from an emitting diode (LED) is directed towards the skin where it is absorbed and scattered in tissues. An adjacent photo sensor detects the backscattered light whose variations are related to changes of blood volume in underlying tissues.

The PPG sensor is placed on the distal pad of the toe and the occlusion cuff is wrapped on the proximal part of the toe.

The occlusion cuff is inflated automatically to a pressure sufficient to stop blood flow, and then deflated slowly at a controlled rate. During deflation, resumption of blood flow downstream from the cuff is detected by the PPG sensor.

The cuff pressure at this time is the toe systolic pressure.