Vascular sound detector

Claim 1

A vascular sound detector for insertion into a blood pressure measuring manchette, comprising a fairly flexible thin filmy wall having a thickness of between 0.3mm and 1.0mm and being made of Neoprene having a hardness of between JIS60 and JIS80 degrees, a relatively thick outer side shell of soft resilient deformable material having a peripheral outer wall of substantially rectangular shape connected to said filmy wall to define therebetween a hollow substantially rectangular space of constant depth and defining an enclosure which is flexible as a whole, at least one longitudinal straight elongated internal rib integrally formed on an intermediate portion of said outer side shell, with its ends spaced from said rectangular outer wall, for sustaining said hollow space without inhibiting longitudinal air movement therein, a condenser microphone communicatively connected to said hollow space, and means to reduce the pickup of extraneous noise without adversely affecting sound collecting, as well as to decompose a vascular sound distinctively according to different frequencies, said means comprising an element having a passage with a diameter between 0.2mm and 1.5mm extending to said hollow space and connecting said hollow space with the ambient atmosphere, whereby said hollow space is maintained as a unitary space and the sound sensing portion of said microphone is directly exposed to the inside of said hollow space.