公开(公告)号：WO2021240374A2

公开(公告)日：2021-12-02

申请号：PCT/IB2021/054556

申请日：2021-05-25

Applicant: TALLINN UNIVERSITY OF TECHNOLOGY

Inventor： OJARAND, Jaan ,  MIN, Mart ,  MÄRTENS, Olev ,  LAND, Raul ,  PRIIDEL, Eiko ,  ANNUS, Paul

IPC: A61B5/0205 ,  A61B5/05 ,  A61B5/277 ,  A61B5/053 ,  A61B5/00 ,  A61B5/6802

Abstract: A wearable bio-electromagnetic sensor comprises an electronic unit containing a means for generating electrical current, and an electromagnetic interface for transforming the generated electrical current into an electromagnetic field applied to a vascularized body tissue. Next, the wearable bio-electromagnetic sensor contains a means for analog signal processing an electrical response of cardiopulmonary system to the applied electromagnetic field. After analog processing of said electrical response, a digital post-processing of digitized electrical response takes place in a means for digital signal processing, embedded into said electronic unit of the wearable bio-electromagnetic sensor. As a result of analog and digital signal processing, an information is extracted, which makes possible medical diagnosing of both, pulmonary and cardiovascular system, separately or simultaneously. The used work principle is following: the applied electromagnetic field induces electrical current inside the body tissue, electrical impedance to which changes correspondingly to breathing and heart beating. Said electrical impedance of varies during every breathing cycle correspondingly to oxygen transporting through arteries and oxygen uptake by capillaries, also due to biomechanical enlargement and narrowing of arteries correspondingly to blood pressure variations.

公开(公告)号：WO2009138093A1

公开(公告)日：2009-11-19

申请号：PCT/EE2009/000007

申请日：2009-05-12

Applicant: TALLINN UNIVERSITY OF TECHNOLOGY ,  ANNUS, Paul ,  MIN, Mart ,  OJARAND, Jaan

Inventor： ANNUS, Paul ,  MIN, Mart ,  OJARAND, Jaan

IPC: A61B5/053

CPC classification number: A61B5/053

Abstract: A method for impedance measurements, using synchronous detecting and modified rectangular signals. The method comprises introducing a first modified rectangular signal into a bioobject, receiving a response signal from said bioobject, introducing said response signal and a second modified rectangular signal into a synchronous detector, whereas either one or both rectangular signals are modified to remove particular higher harmonics from the signal. In one embodiment, either one or both the first and the second modified rectangular signals are generated by summing at least two modified rectangular signals, wherein at least one of such rectangular signals have a zero amplitude segment introduced between rectangular half periods.

Abstract translation: 一种用于阻抗测量的方法，使用同步检测和修改的矩形信号。 该方法包括将第一修改的矩形信号引入到生物对象中，从所述生物体中接收响应信号，将所述响应信号和第二修改的矩形信号引入到同步检测器中，而任一个或两个矩形信号被修改以去除特定的较高谐波 从信号。 在一个实施例中，通过对至少两个修改的矩形信号进行求和来生成第一和第二修改的矩形信号中的一个或两个，其中这些矩形信号中的至少一个具有在矩形半周期之间引入的零幅度段。