Monitoring of Venous Ulcers Using a Bioimpedance Measurement Based Method and System (WoundWatch®)

The purpose of this study is to investigate the functionality of a new type of wound monitoring method and measurement system for monitoring healing of venous ulcers. The system is consisted of a wound dressing with electrodes (eDressing), a bioimpedance measurement device and a mobile phone application.

Study Overview

• Status: Recruiting
• Conditions: Venous Ulcer
• Intervention / Treatment: Device: WoundWatch® wound monitoring system

Detailed Description

The technical principle of the monitoring method is based on the quasimonopolar bioimpedance measurement. The measurement system consists of a bioimpedance measuring device, a wound dressing with electrodes (eDressing) and a mobile application for use with a mobile phone.

The electrode dressing is placed on top of a wound, in contact with the wound tissue. The other necessary dressing layers (such as absorbent dressings and compression bandages) are placed over the electrode dressing. The electrode dressing is kept on the wound for maximum of seven consecutive days. The electrode dressing can be removed and replaced when needed due to medical reasons. Other dressings can be changed considered necessary.

During a study subject visit, the bioimpedance measurement is made using the device, the uppermost dressings are opened carefully and it is ensured that the wound condition is as expected. Upon the replacement of the electrode dressing, the wound is photographed and documented. The wound area is measured, and the findings are recorded.

A maximum of 20 subjects with venous ulcers will be recruited for the study in two study sites (Gdansk, Poland and Tampere, Finland).

Adult subjects (≥18 years) with venous ulcer who are applicable for compression therapy treatment, whose ulcer is not wider than 5 cm and does not excrete excessively can be recruited to the study. Previous surgical venous procedure is not an exclusion criterion for enrollment, but surgical procedure can not be performed during the study.

A subject shall visit the clinic 2-3 times a week, according to the doctor's or study nurse's assessment. Wound healing is monitored until the wound re-epithelized (>90% of initial wound surface area) or maximum two months. Thus, there will be a maximum of 24 study visits per subject.

In addition to scientific objectives, the results of this study are also used as part of clinical evidence when submitting the technical documentation to Notified Body for assessment of the conformity of the device before being placed on the market.

• Study Type: Interventional
• Enrollment (Estimated): 20
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Atte Kekonen, M.Sc.; Phone Number: +358407273627; Email: atte.kekonen@cutosense.fi
• Study Contact Backup: Name: Tuomas Lunden, B.Sc.; Phone Number: +358407211679; Email: tuomas.lunden@cutosense.fi

Study Locations

• Finland
  • Tampere, Finland, 33520
    • Recruiting
    • TAYS Haavakeskuksen poliklinikka
    • Contact: Tiina Ahti, MD, Ph.D.; Phone Number: +358 45 7396 5952; Email: tiina.ahti@pirha.fi
    • Contact: Atte Kekonen, M.Sc.; Phone Number: +40 727 3627; Email: atte.kekonen@cutosense.fi
    • Principal Investigator: Tiina Ahti, MD, Ph.D.
    • Sub-Investigator: Teea Salmi, MD, Ph.D.
• Poland
  • Gdansk, Poland
    • Recruiting
    • University Clinical Centre, Gdańsk
    • Contact: Magdalena Antoszewska, MD; Phone Number: +48698748705; Email: mmantoszewska@gmail.com
    • Contact: Piotr Spychalski, MD, Ph.D.; Email: piotr.spychalski@gumed.edu.pl
    • Principal Investigator: Piotr Spychalski, MD, Ph.D.
    • Sub-Investigator: Magdalena Antoszewska, MD

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Age at least 18 years
• The subject has a chronic lower extremity ulcer with a primary etiology of venous insufficiency. The previous venous procedure is not an obstacle to the study
• Compression therapy can be implemented
• The wound is not wider than 5 cm and the electrode dressing can be placed on the wound as intended. The wound should be located above the ankle, on the skin area where the electrode dressing can be placed properly.
• The wound is not deep with steep edges or cavity-like
• The wound is not highly excreting
• The wound can be expected to heal within two months (area reduced ≥ 90% from baseline)
• The subject gives consent to the study and commits to following the instructions of the medical staff

Exclusion Criteria:

• Clinical wound infection at the time of the study
• The subject has an intravenous (in Tampere: A venous operation) procedure within 2 months
• Significant arterial circulatory disorder or adherence problem that prevents compression therapy (in Tampere: Contraindication for compression therapy, e.g. significant arterial circulatory disorder or severe heart failure)
• Subject movement 2-3 times a week during the study to the study site is difficult to arrange (in Tampere: Subject not able to commit to study visits 2-3 times a week.)
• Diagnosed epoxy resin allergy
• Any other reasons of potential study subject non-compliance by the opinion of the investigator

Additional local exclusion criteria in Tampere site:

• Special groups, such as pregnant women/patients trying to conceive during the study or patients with reduced autonomy
• Subject with any implantable electrical device. Such as pacemaker or implanted defibrillator. Patient has other electrically conductive implanted material in legs. Such as a metallic prostheses.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Other
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Study subject with venous ulcer; The subjects will be monitored using the WoundWatch wound management system two to three study visits per week until the venous ulcer has healed (surface area has decreased at least 90%) or up to two months.

Device: WoundWatch® wound monitoring system; eDressing will be applied along with the compression therapy and the standard absorbing dressings. The subjects will be monitored using the WoundWatch® system. The subjects will have two to three study visits per week until the venous ulcer has healed (surface area has decreased at least 90%) or up to two months.; Other Names: Bioimpedance measurement of wound healing

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Wound Status Index (WSI) vs. wound surface area	Correlation analysis between the WSI and the wound surface area.	From admission to discharge, up to 8 weeks.
Wound Status Index (WSI) vs. wound surface area	Bland-Altman (agreement) analysis between the WSI and the wound surface area.	From admission to discharge, up to 8 weeks.

Collaborators and Investigators

• Sponsor: CutoSense Oy
• Collaborators: Tampere University Hospital; Medical University of Gdansk; University Clinical Centre, Gdansk
• Investigators: Principal Investigator: Piotr Spychalski, MD, Ph.D., Department of General, Endocrine and Transplant Surgery, Medical University of Gdansk

Publications and helpful links

General Publications

• Kekonen A, Bergelin M, Eriksson JE, Vaalasti A, Ylanen H, Kielosto S, Viik J. Bioimpedance method for monitoring venous ulcers: Clinical proof-of-concept study. Biosens Bioelectron. 2021 Apr 15;178:112974. doi: 10.1016/j.bios.2021.112974. Epub 2021 Jan 7.
• Kekonen A, Bergelin M, Johansson M, Kumar Joon N, Bobacka J, Viik J. Bioimpedance Sensor Array for Long-Term Monitoring of Wound Healing from Beneath the Primary Dressings and Controlled Formation of H2O2 Using Low-Intensity Direct Current. Sensors (Basel). 2019 May 31;19(11):2505. doi: 10.3390/s19112505.
• Kekonen A, Bergelin M, Eriksson JE, Vaalasti A, Ylanen H, Viik J. Bioimpedance measurement based evaluation of wound healing. Physiol Meas. 2017 Jun 22;38(7):1373-1383. doi: 10.1088/1361-6579/aa63d6.
• Antoszewska M, Spychalski P, Kekonen A, Viik J, Baranska-Rybak W. Bioimpedance sensor array for monitoring chronic wounds: Validation of method feasibility. Int Wound J. 2024 Aug;21(8):e14899. doi: 10.1111/iwj.14899.

Helpful Links

• CutoSense Oy homepage (Sponsor)

Study record dates

Study Major Dates

• Study Start (Actual): April 20, 2023
• Primary Completion (Estimated): November 30, 2026
• Study Completion (Estimated): December 31, 2026

Study Registration Dates

• First Submitted: March 28, 2023
• First Submitted That Met QC Criteria: March 28, 2023
• First Posted (Actual): April 7, 2023

Study Record Updates

• Last Update Posted (Actual): March 17, 2026
• Last Update Submitted That Met QC Criteria: March 16, 2026
• Last Verified: March 1, 2026

More Information

Terms related to this study

• Keywords: Monitoring; Venous ulcer; Bioimpedance; Wound dressing; Electrode array
• Additional Relevant MeSH Terms: Vascular Diseases; Cardiovascular Diseases; Skin Diseases; Skin Ulcer; Varicose Veins; Leg Ulcer; Skin and Connective Tissue Diseases; Varicose Ulcer
• Other Study ID Numbers: WW001; R23094L (WW001 TAYS) (Registry Identifier: Tampere University Hospital)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No