Medical applications

Arm-leg index (ABI)

Poststenotic blood pressure measurement with the 8 MHz probe

The poststenotic blood pressure measurement is ideal for the verification of and severity determination of peripheral ACD.

To accomplish that, use the Doppler probe to find the easy to locate A. tibialis posterior or the A. dorsalis pedis.
The blood pressure cuff applied directly over the ankle bone is pumped up to the over-systolic values. When relieving the cuff pressure, read the "poststenotic pressure" on the first audible Doppler sound.

This value is compared with the systemic pressure over the A. brachia found in the same manner and the pressure gradient is calculated.
This is correlated with the degree of the stenosis, e.g.:

  Systemic pressure

120 mmHg

- Poststenotic pressure

80 mmHg

  Pressure gradient

40 mmHg

Verifying an acute, deep venous thrombosis

Verifying an acute, deep venous thrombosis with the 4 MHz probe.


The verification of a deep venous thrombosis is one of the most important Doppler applications.


To accomplish that, with the 4 MHz probe localise the V. femoral in the inguinal region and ask the patient to breath forcefully.

In the continuous V. iliac the inspiratory pressure rise leads to a flow stoppage. With a higher haemodynamic relevant stenosis however, this breathing relation is lacking.


The cause for this pathological flow is the high postthrombotic pressure, which, through the collaterals, causes a reduced but completely uniform venous backflow.

Verifying fetal cardiac action

Fetal monitoring


Application examples for the 2 MHz probe


With the 2 MHz probe, your handydop®

becomes a fetal pulse detector for the following indicators:

  1. Verification of fetal cardiac action already from the 9th week p.m. and during the rest of the course of pregnancy.

  2. Demonstration of the fetal life during the lack of a relationship to the pregnancy.

  3. Validation of the fetal vitality if indications of foetal death are observed during precocious pregnancy.


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