公开(公告)号：US10939893B2

公开(公告)日：2021-03-09

申请号：US15573329

申请日：2017-04-10

Applicant: Edan Instruments, Inc

Inventor： Dong Huang ,  Dewei Chen ,  Yong Wu

IPC: A61B8/02 ,  H05K5/00 ,  A61B8/00 ,  A61B8/08 ,  A61B5/00

Abstract: A Doppler fetal heartbeat monitor includes: a housing; a mainboard; a loudspeaker installed in the housing and electrically connected to the mainboard; and an ultrasonic transducer installed in the housing, electrically connected to the mainboard, and comprising at least one transduction wafer configured to generate an impulse wave, in which the ultrasonic transducer is internally provided at a head end of the housing, and the loudspeaker and the mainboard are internally provided at a tail end of the housing. By arranging the loudspeaker, the mainboard and the ultrasonic transducer in the housing, the Doppler fetal heartbeat monitor can have a compact structure and a small volume. Moreover, it is possible to reduce positive feedback of a sound system and a probability of a self-excited whistle.

公开(公告)号：US20180353153A1

公开(公告)日：2018-12-13

申请号：US15573329

申请日：2017-04-10

Applicant: Edan Instruments, Inc

Inventor： Dong Huang ,  Dewei Chen ,  Yong Wu

IPC: A61B8/02 ,  H05K5/00 ,  A61B8/00 ,  A61B8/08

CPC classification number: A61B8/02 ,  A61B5/00 ,  A61B8/08 ,  A61B8/4472 ,  A61B8/462 ,  A61B8/488 ,  A61B2503/02 ,  H05K5/0008 ,  H05K5/0017 ,  H05K5/0086

Abstract: A Doppler fetal heartbeat monitor includes: a housing; a mainboard; a loudspeaker installed in the housing and electrically connected to the mainboard; and an ultrasonic transducer installed in the housing, electrically connected to the mainboard, and comprising at least one transduction wafer configured to generate an impulse wave, in which the ultrasonic transducer is internally provided at a head end of the housing, and the loudspeaker and the mainboard are internally provided at a tail end of the housing. By arranging the loudspeaker, the mainboard and the ultrasonic transducer in the housing, the Doppler fetal heartbeat monitor can have a compact structure and a small volume. Moreover, it is possible to reduce positive feedback of a sound system and a probability of a self-excited whistle.