On an ambulance stretcher suspension concerned with the reduction of patient's blood pressure variation

Abstract

The design process and control of an ambulance stretcher suspension to reduce patient's blood pressure variation (BPV) is discussed. The BPV caused by applying the vehicle brakes may lead to deterioration of a patient's condition. The proposed method can reduce BPV by tilting the stretcher and counterbalancing back-to-front acceleration of the ambulance with gravity. The experimental results obtained when using a manually controlled stretcher confirm that BPV is reduced by tilting the stretcher. A continuous control method that varies the tilting angle is investigated through simulation analysis. The results show that this control method reduces the BPV effectively and achieves safe transport of the patient.

Keywords

ambulance stretcher blood pressure acceleration experiment simulation

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References

Snook

Pacifico

Ambulance ride: Fixed or floating stretcher?

Br. Med. J., 1976, 2, 405–407.

Leyshon

D. R.

Stammers

C. W.

The development and performance of an ambulance stretcher suspension

Proc. Instn Mech Engrs, Part D, 1986, 200 (D4), 249–257.

Stammers

C. W.

Leyshon

Ambulance stretcher suspensions

Proc. Instn Mech. Engrs, Part D, 1985, 199 (02), 151–160.

Blok

Improvement of vibration isolation in transports by bearing flats

J. Soc. Environ. Engrs, 1973, 3–8.

Emergency cardiac care committee and subcommittees, American Heart Association: Guidelines for cardiopulmonary resuscitation and emergency cardiac care

J. Am. Med. Assoc., 1992, 268, 2171–2274.

Vogel

Kohlhaas

von Baumgarten

R. J.

Dependence of motion sickness in automobiles on the direction of linear acceleration

Eur. J. Appl. Physiol., 1982, 48, 399–405.

Sagawa

Takahash

Inooka

Ino-Oka

Modeling of the blood pressure variation at the deceleration of an ambulance

Jap. J. Med. Electronics and Biol. Engng, 1993, 31 (2), 35–42.

Sagawa

Inooka

Ino-Oka

Active control of an ambulance stretcher: Simulation study

Proceedings of the Ninth Korea Automatic Control Conference, Korea, 1994, pp. 100–105.

ISO2631/1—1985. Evaluation of human exposure to whole-body vibration—Part 1: General requirements (International Standardization Organization).

10.

Dorlas

J. C.

Nijboer

J. A.

van der Hoeven

G. M. A.

Settels

J. J.

Wesseling

K. H.

Effects of peripheral vasoconstriction on the blood pressure in the finger, measured continuously by a new noninvasive method (the Finapres)

Anesthesiology, 1985, 62 (3), 342–345.

11.

Van Egmond

Hasenbos

Crul

J. F.

Invasive v. non-invasive measurement of arterial pressure: Comparison of two automatic methods and simultaneously measured direct intra-arterial pressure

Br. J. Anaesthesia, 1985, 57 (4), 434–444.

12.

Molkoek

G. P.

Wesseling

E. H.

Settels

J. J. M.

van Vollenhoven

Weeda

H. W. H.

de Wit

Arntzenius

A. C.

Evaluation of the Penaz servo-plethysmo-manometer for the continuous, non-invasive measurement of finger blood pressure

Basic Res. in Cardiol., 1984, 79 (5), 598–609.

13.

Glaister

D. H.

Cardiovascular responses to sustained acceleration

The Physiologist, 1990, 33, 121–124.

14.

Wood

E. H.

Sturm

R. E.

Human centrifuge noninvasive measurements of arterial pressure at eye level during Gz acceleration

Aviation, Space and Environmental Medicine, 1989, 1005–1010.

15.

Braunwald

Pathophysiology of heart failure In Heart Disease—A Text Book of Cardiovascular Medicine, 1980, pp. 453–472 (W. B. Sanders, Philadelphia).