Blood pressure measurement device
View Patent ↗A blood pressure measurement device includes a curler, a cuff structure on an inner surface of the curler, a case including a tubular shaped outer case and a rear cover fixed to an end portion on a living body side of the outer case and the curler, a portion of the rear cover facing the curler being open, and the rear cover and curler covering the end portion on the living body side of the outer case, a base portion housed in the case, a first sealing member between the rear cover and the curler, that is configured to seal between the rear cover and the curler, and a second sealing member having a higher sealing property than the first sealing member, between an inner circumferential surface of the outer case and the base portion, that is configured to seal between the inner circumferential surface and the base portion.
1 . A blood pressure measurement device attachable to a living body, the blood pressure measurement device comprising:
a curler;
a cuff disposed on an inner surface of the curler;
a case including an outer case having a tubular shape and a rear cover fixed to an end portion on a living body side of the outer case and the curler, an open portion of the rear cover facing the curler being open, and the rear cover covering, together with the curler, the end portion on the living body side of the outer case, the outer case also having a sealing groove located at the end portion on the living body side at an inner circumferential surface of the outer case;
a base portion housed in the case;
a first seal provided between a surface of the rear cover surrounding the open portion and facing the curler and a surface of the curler facing the living body side of the case, the first seal being configured to seal between the rear cover and the curler; and
a second seal provided at the sealing groove between the inner circumferential surface of the outer case and an outer circumferential surface of the base portion, the second seal being constituted in an annular shape that seals between the inner circumferential surface of the outer case and the outer circumferential surface of the base portion and seals between a surface of the rear cover facing the living body side of the case and the base portion, and the second seal having a higher sealing property than the first seal,
wherein the second seal is fixed to the outer circumferential surface of the base portion,
wherein a region of the second seal from one end of the second seal on a side opposite the living body side to a midway portion of the second seal has a surface with a diameter that gradually increases from the one end to the midway portion, and an outer diameter of one end on the living body side of the second seal has a diameter that is smaller than an inner diameter of an opening end on the living body side of the sealing groove, and
wherein the open portion of the rear cover is covered by the curler, and the first seal has an annular shape such that the first seal surrounds the open portion of the rear cover.
2 . The blood pressure measurement device according to claim 1 , wherein
the outer case includes a first abutting portion; and
the base portion includes a second abutting portion configured to abut on the first abutting portion in an axial direction of the outer case.
3 . The blood pressure measurement device according to claim 1 , wherein the first seal is constituted by a double-sided tape.
4 . The blood pressure measurement device according to claim 1 , wherein the second seal is integrally formed with the base portion.
5 . The blood pressure measurement device according to claim 1 , wherein an outer circumferential surface of the second seal in a pre-deformation state has an intermediate portion in an axial direction of the outer case, and the intermediate portion has a larger diameter than other portions of the outer circumferential surface of the second seal.
6 . The blood pressure measurement device according to claim 1 , wherein the outer circumferential surface of the base portion includes an annular protrusion portion disposed inside the second seal and protruding toward the inner circumferential surface of the outer case.
7 . The blood pressure measurement device according to claim 1 , wherein an intermediate portion in a radial direction of an end surface on the living body side of the second seal protrudes further to the living body side than an end on the living body side of the outer case, in a state before the rear cover is fixed to the case.