The goal of this study is to develop and validate a new non-invasive medical instrumentation technology for blood pressure measurement.

The goal of this study is to develop and validate a new non-invasive medical instrumentation technology for assessing haemodynamic status measured from the fingertip using oscillometry. . As the finger pressing pressure is ramped up and then slowly down, an oscillometric response is recorded. From this signal the mean arterial pressure is found from which systolic and diastolic pressure is computed along with the full pressure waveform.

Inclusion Criteria:

• written concent from the participant

Exclusion Criteria:

• pace maker, pregnancy

33 volunteers (weight: mean 77 kg [range:48 to 117 kg]; height: mean 176 cm [range: 161 to 194 cm]; age: mean 32 [range: 23 to 75 years], 8 females) The subjects had a blood pressure range (DBP: 56 to 84 mmHg, SBP: 93 to 146 mmHg) and four of them were on blood pressure medication. Three measurements were performed on both the reference and the experimental device from which an average was calculated

32 volunteers (age: mean 47 years [range: 24 to 83 years], 5 women). The validation study was carried out at Turku University Hospital. For reference manual auscultation was performed by two trained observers, and the maximum acceptable difference between the readings from the observers was 4 mmHg for both SBP and DBP. After an initial test measurement, three measurements were taken in a cyclical manner one device after another, both with the finger device and by auscultation.