"Implementation of wireless biomedical sensors in advanced clinical care"


Authors: Karl Oyri¹, Ilangko Balasingham¹, Jan-Olav Høgetveit²
Speaker: Karl Oyri

Origin Institution:
¹ The Interventional Centre, Rikshospitalet University Hospital
² Department of Biomedical Engineering, Rikshospitalet University Hospital

E-mail:
karl.oyri@klinmed.uio.no


County: Norway

Post Address:
Karl Oyri
The Interventional Centre
Rikshospitalet University Hospital
0027 Oslo
Norway


Thematic: wireless technology, point of care data, invasive blood pressure, biomedical sensor


Índice general


Introduction


The Wireless Health and Care Project (WSHC) (1), partly funded by the Norwegian Research Council, focuses on wireless technology in healthcare. WSHC involves industrial-, research Institute-, and clinical partners. The Interventional Centre (IVC) at Rikshospitalet University Hospital in Oslo, Norway is one of the clinical partners. As part of the WSHC Project, research was performed at IVC to evaluate the use of wireless biomedical sensors in clinical practice. The research hypothesis was that a difference between wired and wireless pressure measurements was to be expected.


Methods
Sensor data from a modular wireless non-disposable piezoresistive biomedical sensor prototype for continuous invasive blood pressure measurement and continuous 2-channel ECG developed by MemsCap (2) was compared with a state of the art patient monitoring system from Siemens Medical utilizing disposable biomedical sensors from Edwards Lifesciences (3). Measurements were performed in a clinical trial involving four major laparoscopic surgical procedures. The wireless standard Bluetooth (4) was used, as investigated in an OR setting (5). High resolution data from the two types of biomedical sensors were collected in customized LabView applications (6) during the surgical procedures and compared in MatLab (6) statistically and sample-by-sample for visual inspection at a sampling rate of 100HZ.


Results
We observed a very high rate of correlation between signal amplitudes of the wireless and wired biomedical sensors during four laparoscopic surgical procedures. This correlation is illustrated in Figure 1.


Discussion
Small changes in technology for invasive blood pressure measurement have taken place last three decades (7). Transportation of critically ill patients require adequate planning and monitoring during transport (8 -10). Uninterrupted wireless monitoring facilitates intrahospital patient transport. Wireless monitoring replaces cables and reduce the potential risk for adverse events related to disconnection (10). Wireless technology also is battery driven, thus suitable for pre-hospital patient monitoring. Traditional patient monitors are expensive and operate on proprietary platforms, producing analog signals. Processing of digital signals is of great interest in the point of care clinical setting (11). The wireless biomedical sensor prototype represents a low-cost, reliable and flexible alternative to traditional signal transmission and data processing.


Conclusion

Wireless transmission of blood pressure data and EKG signals in the OR is a stable, accurate and simple method with a potential for developing new and cost-effective procedures, and to replace traditional monitoring solutions based on cables.



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Bibliography

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(2) Wireless Physiological Pressure Transducer. 2004. Ref Type: Pamphlet

(3) Truwave PX 600F Pressure Monitoring Set. 2004. Edwards Lifesciences Germany GmbH. Ref Type: Pamphlet

(4) Bluetooth. https://www bluetooth org/ 2004 [cited 2004 Oct 30];Available from: URL: https://www.bluetooth.org/

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(6) National Instruments. http://www ni com/ 2004 [cited 2004 Nov 8];Available from: URL: http://www.ni.com/

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(8) Szem JW, Hydo LJ, Fischer E, Kapur S, Klemperer J, Barie PS. High-risk intrahospital transport of critically ill patients: safety and outcome of the necessary "road trip". Critical Care Medicine 1995 Oct;23(10):1660-6.

(9) Velmahos GC, Demetriades D, Ghilardi M, Rhee P, Petrone P, Chan LS. Life support for trauma and transport: a mobile ICU for safe in-hospital transport of critically injured patients. Journal of the American College of Surgeons 2004;199(1):62-8.

(10) Smith I, Fleming S, Cernaianu A. Mishaps during transport from the intensive care unit. Critical Care Medicine 1990 Mar;18(3):278-81.

(11) Celi LA, Hassan E, Marquardt C, Breslow M, Rosenfeld B. The eICU: it's not just telemedicine. Critical Care Medicine 2001 Aug;29(8 Suppl):183-9.





Figure 1: Wired and wireless blood pressure samples.


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