The Effect of an Actively Controlled Stretcher for an Ambulance on the Reduction of Blood Pressure Variation.
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概要
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The effect of an actively controlled stretcher (ACS) for an ambulance on the reduction of blood pressure variation during brake is discussed. Applying of the brake generates foot-to-head acceleration to the transported patient and causes the rise of the blood pressure at the head. There is a possibility that the blood pressure variation aggravates the patient's condition and causes the increase of the number of DOA (Dead On Arrival). The ACS has a tilting mechanism to absorb the foot-to-head acceleration by applying the gravitational acceleration. Desired angle of the ACS is calculated from the ambulance acceleration and the tilting angle is controlled actively. Emergency brake tests are performed to measure the continuous blood pressure in the finger of ten healthy male volunteers when the ACS is fixed or actively controlled. The position of the finger where the blood pressure is measured is set at eye level or the side of the waist to show the characteristics of the blood pressure variation in the body. Two kinds of indexes are proposed to indicate the effect of the ACS: one is root mean square value of the blood pressure variation which shows long-term change of the blood pressure and the other is maximal and minimal value of the blood pressure variation which express instantaneous change of the blood pressure. The experimental results show that the ACS stabilizes the long-term variation of the blood pressure and reduces the instantaneous change of the blood pressure at the eye level by 40 per cent compared with the conventional stretcher.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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