BIOLOGICAL SIGNAL DETECTING APPARATUS AND IMPLANTABLE MEDICAL DEVICE

• US 20150342490A1
• Filed: 08/12/2015
• Published: 12/03/2015
• Est. Priority Date: 02/15/2013
• Status: Abandoned Application

• Current Assignee: Olympus Corporation
• Original Assignee: Olympus Corporation
• Inventors: Yazicioglu, Refet Firat, Osawa, Masato, Sachin, Shrestha, Tom, Torfs
• Application Number:
  US14/824,260
• Publication Number:
  US 20150342490A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 5/352 Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
• CPC Class Codes: A61B 5/4836 Diagnosis combined with treatment in closed-loop systems or methods A61B5/0036 takes precedence
• CPC Class Codes: A61B 5/686 Permanently implanted devices, e.g. pacemakers, other stimulators, biochips A61B5/6861 takes precedence
• CPC Class Codes: A61B 5/6869 Heart
• CPC Class Codes: A61N 1/36514 controlled by a physiological quantity other than heart potential, e.g. blood pressure controlled by two or more physical parameters A61N1/36585

Abstract

A biological signal detecting apparatus includes a BPF to which a biological signal is input via a lead directly connected to a subcutaneous tissue that emits the biological signal including a predetermined signal of a first frequency and which outputs a filtered biological signal by filtering a biological event signal of a predetermined frequency including the first frequency; and a peak detecting means to which at least the filtered biological signal is input and which detects a peak location of the biological event signal. The BPF includes a first order HPF which filters a frequency higher than a second frequency and a first order LPF which filters a frequency lower than a third frequency. The HPF and the LPF are connected in series between the lead and the peak detecting means. A difference between the second frequency and the third frequency is less than or equal to 10 Hz.

Claims

1. A biological signal detecting apparatus comprising:

a band pass filter (BPF) to which a biological signal is input via a lead directly connected to a subcutaneous tissue that emits the biological signal including a predetermined signal of a first frequency and which outputs a filtered biological signal by filtering a signal (biological event signal) of a predetermined frequency including the first frequency; and

a peak detecting means to which at least the filtered biological signal is input and which detects a peak location of the biological event signal by processing the filtered biological signal,

wherein the BPF includes a first order high-pass filter (HPF) which filters a frequency higher than a second frequency and a first order low-pass filter (LPF) which filters a frequency lower than a third frequency,

wherein the HPF and the LPF are connected in series between the lead and the peak detecting means, and

wherein a difference between the second frequency and the third frequency is less than or equal to 10 Hz.

2. The biological signal detecting apparatus according to claim 1,

wherein the second frequency is less than the first frequency and greater than or equal to 6 Hz, and

wherein the third frequency is greater than the first frequency and less than or equal to 25 Hz.

3. The biological signal detecting apparatus according to claim 1, further comprising:

a gain amplifier which is connected between the HPF and the LPF and amplifies a signal gain.

4. The biological signal detecting apparatus according to claim 3,

wherein the gain amplifier is a variable gain amplifier, and

wherein a gain of the variable gain amplifier is varied to an extent to which a signal component decayed by the BPF is compensated for.

5. The biological signal detecting apparatus according to claim 1, wherein both the HPF and the LPF are configured in a switched capacitor type.

6. An implantable medical device comprising:

the biological signal detecting apparatus according to claim

a diagnosis means; and

a therapy signal generating means,

wherein the biological signal is an IFCG signal,

wherein the tissue is a heart,

wherein the biological event signal is an R wave,

wherein the lead is connected to at least one of a right ventricle and a left ventricle of the heart,

wherein the diagnosis means receives an input of the peak location and outputs a diagnosis result corresponding to information of the peak location; and

wherein the therapy signal generating means receives an input of the diagnosis result and applies a therapy signal corresponding to the diagnosis result to an atrium for which therapy is necessary via the lead.