Arteriosclerosis degree judgment device capable of judging arteriosclerosis degree precisely
A cuff of a pulse wave meter equipped with an arteriosclerosis degree judgment device has air bags for compressing a living body having a double structure along an artery including an avascularization air bag and a pulse-wave measuring air bag. Provided at outer circumferential sides of these air bags are a curler for integrally pressing these air bags against an upper arm, and an air bag for pressing the curler from the outer circumferential side. A member for suppressing vibrations is provided between a curler-compressing air bag and the pulse-wave measuring air bag, and suppresses propagation of vibrations from the curler-compressing air bag to the pulse-wave measuring air bag. The pulse wave meter measures a pulse wave based on changes in internal pressure in the pulse-wave measuring air bag while the avascularization air bag provides avascularization at the peripheral side.
1. An arteriosclerosis degree judgment device comprising:
a first fluid bag to be wrapped around a measurement site at a central side thereof and a second fluid bag to be wrapped around the measurement site at a peripheral side thereof;
a compression member located at outer circumferential sides of both of said first fluid bag and said second fluid bag to oppose to said measurement site, for integrally covering both of said first fluid bag and said second fluid bag;
a first sensor for measuring an internal pressure in said first fluid bag;
an adjustment unit for adjusting a pressure force of said compression member;
a detection unit for detecting a pulse wave at said measurement site based on a change in the internal pressure in said first fluid bag; and
a calculation unit for analyzing said pulse wave to calculate an index for judging a degree of arteriosclerosis,
wherein said adjustment unit causes said compression member to pressurize both of said first fluid bag and said second fluid bag so as to be compressed against said measurement site, said first fluid bag and said second fluid bag being pressed against said measurement site with a certain pressure force, and
wherein said detection unit detects the pulse wave at said measurement site based on the change in the internal pressure in said first fluid bag while being pressed against said measurement site with said certain pressure force,
wherein said compression member is a third fluid bag, and
wherein said adjustment unit detects vibration in said third fluid bag and actively exerts control for adjusting an internal pressure in said third fluid bag in accordance with the vibration of said third fluid bag serving as said compression member to actively cancel out said vibration.
2. The arteriosclerosis degree judgment device according to claim 1 , wherein said detection unit detects the pulse wave at said measurement site based on the change in the internal pressure in said first fluid bag with said second fluid bag being pressed against said measurement site to provide avascularization.
3. The arteriosclerosis degree judgment device according to claim 1 , further comprising a suppression member disposed between said first fluid bag and said compression member for suppressing propagation of a vibration of said compression member to said first fluid bag.
4. The arteriosclerosis degree judgment device according to claim 1 ,
wherein said first fluid bag and said third fluid bag serving as said compression member are connected to each other with an orifice interposed therebetween, and
wherein said orifice suppresses propagation of a vibration of said third fluid bag to said first fluid bag.
5. The arteriosclerosis degree judgment device according to claim 4 , further comprising an orifice adjusting unit for adjusting an amount of flow of fluid through said orifice between said first fluid bag and said third fluid bag, said orifice adjusting unit adjusting said amount of flow such that said first fluid bag has a constant pressure.
6. The arteriosclerosis degree judgment device according to claim 1 ,
wherein said compression member is an artificial muscle member that produces power from an electrical signal, and
wherein said adjustment unit outputs said electrical signal to said artificial muscle member serving as said compression member to adjust the pressure force.
7. The arteriosclerosis degree judgment device according to claim 1 , further comprising:
a second sensor for measuring an internal pressure in said second fluid bag,
wherein said calculation unit calculates a blood pressure value based on a change in the internal pressure in said second fluid bag.