Wrist plethysmograph
First Claim
1. - A blood pressure sensing device comprising a housing, a piezo sensing element mounted within said housing, said housing comprising a face plate and a wrist posterior contact member, said piezo sensing element being fixed to said face plate, and means to cause said piezo element to flex in response to an external force on said wrist posterior contact member, wherein said external force is the pressure of arterial blood.
1 Assignment
0 Petitions
Accused Products
Abstract
A pulse monitoring plethysmograph system for establishing a history of the pulses of the user over an extended period of time, comprises a housing, a piezoelectric sensing element mounted within said housing, and fixed to the housing, a force transmitting member positioned to cause said piezoelectric sensing element to flex in response to an external force and to generate a current, and a transimpedance amplifier. The transimpedance amplifier converts the current generated by the flexing of the piezoelectric element into a voltage signal and an analog to digital converter converts the voltage signal into digital data. A digital memory storing member is provided for storing the digital data and establishing a history of data over an extended period of time.
97 Citations
21 Claims
- 1. - A blood pressure sensing device comprising a housing, a piezo sensing element mounted within said housing, said housing comprising a face plate and a wrist posterior contact member, said piezo sensing element being fixed to said face plate, and means to cause said piezo element to flex in response to an external force on said wrist posterior contact member, wherein said external force is the pressure of arterial blood.
-
10. - A pulse monitoring plethysmograph system for establishing a history of the pulses of the user over an extended period of time, comprising
a housing, a piezoelectric sensing element mounted within said housing, said piezoelectric sensing element being fixed to said housing, a force transmitting member positioned to cause said piezoelectric sensing element to flex in response to an external force and to generate a current, a transimpedance amplifier, said transimpedance amplifier converting the current generated by flexing of said piezoelectric element into a voltage signal, an analog to digital converter for converting said voltage signal into digital data, and digital memory storing member for storing said digital data and establishing a history of data over an extended period of time.
- 20. A method of continuous non-invasive blood pressure monitoring, comprising strapping a plethysmograph to at least one of a user'"'"'s wrists, physically altering a piezoelectric sensing element in response arterial wrist pulse producing wrist expansions and contractions, whereby said piezoelectric element generates an electrical current, converting said current into a voltage signal by means of a transimpedance amplifier circuit, and generating digital data from said voltage signal, said data corresponding to blood pressure wave forms.
Specification