Pulse wave sensor unit
A pulse wave sensor unit includes a pressure sensor, and an adhesive tape to attach the pressure sensor to a measurement portion to be measured. The pressure sensor includes a diaphragm part, and an annular support part which supports the diaphragm part and has an aperture for allowing the diaphragm part to face the measurement portion, and a closed space is able to be formed between the diaphragm part and the measurement portion by attaching the pressure sensor to the measurement portion using the adhesive tape.
1. A pulse wave sensor unit comprising:
a blood pressure pulse wave pressure sensor;
a fastener that attaches the blood pressure pulse wave pressure sensor to a measurement portion that generates measurable blood pressure pulse waves, and
an annular seal which is interposed between the blood pressure pulse wave pressure sensor and the measurement portion, wherein
the blood pressure pulse wave pressure sensor includes:
a diaphragm that includes a detector and uninterruptedly faces the measurement portion, the detector detecting deformation of the diaphragm, and
an annular support which supports the diaphragm and integrally formed with the diaphragm, the annular support comprising:
an aperture for allowing the diaphragm to face the measurement portion,
an inner surface, and
an outer surface exposed to an outside, wherein:
the annular seal is directly attached to the annular support and directly contacts the measurement portion,
a closed space defined by the inner surface is formed between the diaphragm and the measurement portion during the measurement of the measurement portion and when the blood pressure pulse wave pressure sensor is attached to the measurement portion by the fastener,
the diaphragm is deformed by up-and-down motion of the blood pressure pulse waves generated by the measurement portion via fluid transmitted within the closed space, and
the blood pressure pulse wave pressure sensor is separated from the measurement portion during measurement of the measurement portion, detects deformation of the diaphragm, and generates a pulse wave voltage from the generated blood pressure pulse waves.
2. The pulse wave sensor unit according to claim 1 , further comprising a wiring circuit board on which the blood pressure pulse wave pressure sensor is mounted.
3. The pulse wave sensor unit according to claim 2 , further comprising an electromechanical connector which mechanically and electrically connects the wiring circuit board and the blood pressure pulse wave pressure sensor, wherein
the wiring circuit board and the blood pressure pulse wave pressure sensor face each other through the electromechanical connector.
4. The pulse wave sensor unit according to claim 3 , wherein
a gap is formed between the diaphragm and the wiring circuit board.
5. The pulse wave sensor unit according to claim 4 , wherein
the gap is formed by the electromechanical connector.
6. The pulse wave sensor unit according to claim 3 , wherein
the blood pressure pulse wave pressure sensor includes:
a piezo-resistor which is provided in the diaphragm; and
a first electrode which is provided on a first main surface of the support facing the wiring circuit board and is electrically connected to the piezo-resistor,
the wiring circuit board includes a second electrode which is provided on a second main surface facing the blood pressure pulse wave pressure sensor, and
the electromechanical connector electrically connects the first electrodes and the second electrodes.
7. The pulse wave sensor unit according to claim 6 , wherein
the electromechanical connector includes a solder ball, and
the solder ball includes:
a core; and
a solder layer which covers the core.
8. The pulse wave sensor unit according to claim 6 , further comprising:
a cable which has one end connected to the wiring circuit board; and
a cable connector which is connected to the other end of the cable.
9. The pulse wave sensor unit according to claim 8 , wherein
the wiring circuit board includes:
a third electrode which is provided on an opposite surface to the second main surface, and
a conduction path which electrically connects the second electrode and the third electrode, and
the cable is connected to the third electrode.
10. The pulse wave sensor unit according to claim 1 , wherein the annular support extends below and supports the diaphragm.