Proof-of-principle Experiment on 24 GHz Medical Radar for Non-contact Vital Signs Measurement

A novel non-contact vital-sign sensing algorithm for use in cases of multiple subjects is proposed. The approach uses a 24 GHz frequency-modulated continuous-wave Doppler radar with the parametric spectral estimation method. Doppler processing and spectral estimation are concurrently implemented to detect vital signs from more than one subject, revealing excellent results. The parametric spectral estimation method is utilized to clearly identify multiple targets, making it possible to distinguish multiple targets located less than 40 cm apart, which is beyond the limit of the theoretical range resolution. Fourier transformation is used to extract phase information, and the result is combined with the spectral estimation result. To eliminate mutual interference, the range integration is performed when combining the range and phase information. By considering breathing and heartbeat periodicity, the proposed algorithm can accurately extract vital signs in real time by applying an auto-regressive algorithm. The capability of a contactless and unobtrusive vital sign measurement with a millimeter wave radar system has innumerable applications, such as remote patient monitoring, emergency surveillance, and personal health care.

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A 24 GHz integrated SiGe BiCMOS vital signs detection radar front-end

2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC) ◽

10.1109/imoc.2013.6646478 ◽

2013 ◽

Author(s):

Brian Sveistrup Jensen ◽

Tom K. Johansen ◽

Vitaliy Zhurbenko

Keyword(s):

Vital Signs ◽

Front End ◽

Sige Bicmos ◽

24 Ghz

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A Resolution Enhancement Technique for Remote Monitoring of the Vital Signs of Multiple Subjects Using a 24 Ghz Bandwidth-Limited FMCW Radar

IEEE Access ◽

10.1109/access.2019.2961130 ◽

2020 ◽

Vol 8 ◽

pp. 1240-1248 ◽

Cited By ~ 4

Author(s):

Hyunjae Lee ◽

Byung-Hyun Kim ◽

Jin-Kwan Park ◽

Sung Woo Kim ◽

Jong-Gwan Yook

Keyword(s):

Remote Monitoring ◽

Resolution Enhancement ◽

Vital Signs ◽

Enhancement Technique ◽

Fmcw Radar ◽

24 Ghz ◽

Resolution Enhancement Technique

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24 GHz Flexible Antenna for Doppler Radar-Based Human Vital Signs Monitoring

Sensors ◽

10.3390/s21113737 ◽

2021 ◽

Vol 21 (11) ◽

pp. 3737

Author(s):

Nitin Kathuria ◽

Boon-Chong Seet

Keyword(s):

Antenna Array ◽

Doppler Radar ◽

Human Subjects ◽

Vital Signs ◽

New Class ◽

Antenna Performance ◽

Vital Signs Monitoring ◽

Compact Size ◽

Flexible Antenna ◽

24 Ghz

Noncontact monitoring of human vital signs has been an emerging research topic in recent years. A key approach to this monitoring is the use of the Doppler radar concept which enables real-time vital signs detection, resulting in a new class of radar system known as bio-radar. The antennas are a key component of any bio-radar module and their designs should meet the common requirements of bio-radar applications such as high radiation directivity and mechanical flexibility. This paper presents the design of a four-element antenna array on a flexible liquid crystal polymer (LCP) substrate of 100 μm thickness and εr of 3.35. The designed antenna array can be used with a 24 GHz bio-radar for vital signs monitoring in a non-contact manner. It features a relatively compact size of 36.5 × 53 mm2 and measured gain of 5.81 dBi. The two vital signs: breathing rate (BR) and heart rate (HR) of two human subjects are detected with relatively good accuracy using the fabricated antenna array and radio frequency (RF) output power of −3 dBm from a distance of approximately 60 cm. The effect of bending on the antenna performance is also analyzed.

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A model for testing topical haemostatic dressings for peripheral extremity haemorrhage following amputation

Journal of The Royal Naval Medical Service ◽

10.1136/jrnms-104-169 ◽

2018 ◽

Vol 104 (3) ◽

pp. 169-172

Author(s):

M Welch ◽

J Barratt ◽

S Martin ◽

C Wright

Keyword(s):

Animal Model ◽

Model Development ◽

Vital Signs ◽

Primary Treatment ◽

Traumatic Amputation ◽

Post Injury ◽

Haemorrhage Control ◽

Extremity Amputation ◽

Proof Of Principle

AbstractAimsTo assess the viability of a peripheral extremity amputation and haemorrhage model for testing topical haemostatic dressings, and secondarily to test whether a topical haemostatic dressing would arrest bleeding and maintain haemostasis without a tourniquet in this model.MethodsAn animal model was used during proof of principle model development. Bilateral through-elbow amputations were performed on a single swine under anaesthetic and treated with application of Celox Rapid topical haemostatic dressing (Celox gauze) to the stump after 30 seconds of free bleeding. Following initial haemostasis, the wound sites were bandaged using standard trauma dressings. Vital signs were monitored throughout the study.ResultsThe animal survived and, in both amputations, haemorrhage was successfully controlled. There was no evidence of re-bleeding during the 30 minutes post-injury or following removal of the packed Celox gauze from the wound sites.ConclusionTopical haemostatic dressings could be considered alongside tourniquets for use as a primary treatment of peripheral extremity haemorrhage due to traumatic amputation. It may be useful in prolonged field care where evacuation is delayed or where tourniquet alone does not provide adequate haemorrhage control.

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