(19)

(11)

EP 0 537 172 A1

(12)

(43) Date of publication: 21.04.1993 Bulletin 1993/16 (21) Application number: 91909447.0 (22) Date of filing: 21.05.1991

(51) International Patent Classification (IPC):  A61H 23/ 04( . ) (86) International application number: PCT/GB1991/000792 (87) International publication number: WO 1992/000715 (23.01.1992 Gazette 1992/03)

(84) Designated Contracting States: BE DE ES FR IT (30) Priority: 05.07.1990 GB 19900014883 21.02.1991 GB 19910003690 (71) Applicant: HUNTLEIGH TECHNOLOGY PLC Luton, Bedfordshire LUI 1SS (GB)	(72) Inventor: SCHILD, Rolf London N2 (GB) (74) Representative: Shackleton, Nicola, et al  Boult, Wade & Tennant 27 Furnival Street London EC4A 1PQ London EC4A 1PQ (GB)