KR950703891A - 전자청진기 - Google Patents

전자청진기 Download PDF

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Publication number
KR950703891A
KR950703891A KR1019950702306A KR19950702306A KR950703891A KR 950703891 A KR950703891 A KR 950703891A KR 1019950702306 A KR1019950702306 A KR 1019950702306A KR 19950702306 A KR19950702306 A KR 19950702306A KR 950703891 A KR950703891 A KR 950703891A
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South Korea
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frequency
sound
electrical signal
filter
electronic stethoscope
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KR1019950702306A
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조셀린 듀런드
루이스-길레스 듀런드
마리-클로드 그레니어
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안드레드 빌러스
큐라테크놀러지스 인코포레이티드
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Publication of KR950703891A publication Critical patent/KR950703891A/ko

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B7/00—Instruments for auscultation
    • A61B7/02—Stethoscopes
    • A61B7/04—Electric stethoscopes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B7/00—Instruments for auscultation
    • A61B7/005—Detecting noise caused by implants, e.g. cardiac valves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/0245—Detecting, measuring or recording pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals
    • A61B5/025—Detecting, measuring or recording pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals within occluders, e.g. responsive to Korotkoff sounds

Abstract

본 전자청진기는 대상음의 청진을 최적하는 한편 여러 종류의 소음의 영향을 최소화하며 심장전문의가 기계적심장판막을 청진할 수 있도록 설계된 것이다. 이 전자청진기는 (a) 미동의 필터링과 75Hz 이하의 주파수를 포함하는 범위의 저주파수의 대상음성분의 통과를 최적화하는 주파수응답을 갖는 제1필터부와, (b) 주파수에 따른 인간의 귀의 감도변화를 고려하여 주위소음의 감쇠와 110-1,300Hz의 범위와 대상음성분의 통과를 최적화하는 주파수응답을 갖는 제2필터부와, (c) 기계적심장판막의 음을 통과시키기 위한 제3필터부와, (d) 전기적신호의 진폭레벨을 검출하여 펄스발생기를 동작시켜 펄스를 가청주파수증폭기에 가하여, 검출된 진폭레벨이 소정의 진폭레벨스레숄드보다 높을때 상기 가청주파증폭기를 디스인에이블시키는 레벨검출기로 구성된다.

Description

전자청진기
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 향미동필터부, 외부소음격리필터부, 기계적판막필터부 및 속귀보호부로 구성되는 본 발명에 따른 전자청진기의 바람직한 구체예의 개략블록도,
제2도는 제1도의 전자청진기의 주파수응답을 나타내는 로그그래프,
제3도는 제1도의 전자청진기의 항미동필터부의 블록도,
제4도는 제1도의 청전기의 외부소음격리필터부의 블록도.

Claims (20)

  1. 환자신체내에서 발생되는 대상음을 감지하고 상기 음을 전기적신호로 변환하기 위한 제1수단으로서, 상기 제1수단은 사용자의 손에 의해 조작되며, 상기 전기적신호는 제1수단을 조작할때 사용자의 손의 무의식적인 떨림동작에 의해 발생된 저주파수의 음을 포함하며, 상기 소음과 음은 모두 공통의 저주파수 범위내에 있는 주파수성분을 갖도록 된 제1수단과, 공통의 저주파수범위의 상기 전기적신호를 감쇠하기 위한 필터부로서, 상기 필터부는 상기 공통의 저주파수범위에서 상기 범위의 저주파수의 소음성분의 대부분을 감쇠하고 상기 범위의 고주파수의 음성분의 대부분을 감쇠하기 위한 고역통과주파수응답을 가지므로 상기 전기적신호에 높은 신호-소음비를 제공하도록 된 필터부와, 상기 필터부로부터의 전기적신호에 응답하여 상기 음을 재생하여 사용자가 상기 음을 들을 수 있도록 하는 제4수단으로 구성되는 것을 특징으로 하는 전자청진기.
  2. 제1항에 있어서, 상기 공통의 저주파수범위는 0-75Hz의 주파수범위로 구성되는 것을 특징으로 하는 전자청진기.
  3. 제2항에 있어서, 상기 고역통과 주파수응답은 30Hz의 주파수에서 약 40dB의 감쇠와 70Hz의 주파수에서 약 3dB의 감쇠를 만드는 것을 특징으로 하는 전자청진기.
  4. 제3항에 있어서, 상기 필터부는 연속적으로 상호 연결된 제1 및 제2고역통과필터로 구성되며, 상기 제1고역통과필터는 60Hz의 주파수에서 30dB의 감쇠를 만들고, 상기 제2고역통과필터는 80Hz의 주파수에서 약 30dB의 감쇠를 만드는 것을 특징으로 하는 전자청진기.
  5. 환자신체내에서 발생되는 대상음을 감지하고 상기 음을 전기적신호로 변환하기 위한 제1수단으로서, 상기 제1수단은 외부의 주위음을 감지할 수 있으므로 상기 전기적신호는 상기 외부의 주위음에 의해 발생된 소음을 구비하며, 상기 소음과 음은 모두 공통주파수범위내의 주파수성분을 갖도록 된 제1수단과, 공통주파수범위의 상기 전기적신호를 감쇠하기 위한 필터부로서, 상기 필터부는 주파수에 따른 인간의 귀의 감도의 변화를 고려하여 상기 소음성분의 감쇠와 상기 음성분의 통과를 최적화하기에 적절한 주파수응답을 갖도록 된 필터부와, 필터부로터의 상기 전기적신호에 따라서 상기 음을 재생하여 사용자가 상기 음을 들을 수 있게 하는 제2수단으로 구성되는 것을 특징으로 하는 전자청진기.
  6. 제5항에 있어서, 다이아프램모드에서 동작하며, 상기 공통주파수범위는 160-1,300Hz 사이에 있는 주파수범위로 구성되는 것을 특징으로 하는 전자청진기.
  7. 제6항에 있어서, 상기 필터부는 160Hz의 주파수에서 약 3dB의 감쇠와 700Hz의 주파수에서 약 40dB의 감쇠를 만드는 저역통과필터로 구성되는 것을 특징으로 하는 전자청진기.
  8. 제5항에 있어서, 벨모드에서 동작하며, 상기 공통주파수범위는 110-1,300Hz사이에 있는 주파수범위로 구성되는 것을 특징으로 하는 전자청진기.
  9. 제8항에 있어서, 상기 필터부는 90Hz의 주파수에서 약 3dB의 게인과, 120Hz의 주파수에서 3dB의 감쇠와, 550Hz의 주파수에서 약 40dB의 감쇠를 만드는 저역통과필터로 구성되는 것을 특징으로 하는 전자청진기.
  10. 환자신체내에서 발생되며, 고주파수범위내의 주파수성분을 갖는 기계적심장판막에 의해 발생되는 음으로 구성되는 대상음을 감지하고 상기 대상음을 전기적신호로 변환하기 위한 제1수단과, 상기 대상음을 상기 전기적신호에 따라서 재생하여 사용자가 상기 대상음을 들을 수 있게 하는 제2수단과, 고주파수범위내에 있으며 상기 전기적신호에 포함된 상기 주파수성분을 통과시키기 위해 상기 제1수단과 제2수단 사이에 개재되는 제3필터수단과, 상기 주파수성분의 검출에 응답하여 상기 제3필터수단으로부터의 상기 주파수성분을 제2수단으로 전달하여 상기 기계적심장판막의 음을 재생시키기 위한 제4수단으로 구성되는 것을 특징으로 하는 전자청진기.
  11. 제10항에 있어서, 상기 고주파수범위는 1.3-20kHz내의 주파수범위로 구성되는 것을 특징으로 하는 전자청진기.
  12. 제11항에 있어서, 상기 필터부는 2.5kHz의주파수에서 약 40dB의 감쇠와, 5-10kHz의 주파수에서 약 20dB의 감쇠와, 30kHz의 주파수에서 약 40dB의 감쇠는 만드는 대역통과필터로 구성되는 것을 특징으로 하는 전자청진기.
  13. 제10항에 있어서, 상기 제4수단은 상기 제3필터수단과 상기 제2수단 사이에 개재된 스위치부와, 제3필터수단으로부터의 전기적신호를 받아들이고 상기 주파수성분에 따라서 상기 스위치부를 폐쇄하여 상기 주파수성분을 상기 제3수단에 공급하기 위한 주파수검출기로 구성되는 것을 특징으로 하는 전자청진기.
  14. 환자신체내에서 발생되는 대상음을 감지하고 상기 대상음을 전기적신호로 변환하기 위한 제1수단과, 제1수단으로부터의 상기 전기적신호에 따라서 상기 대상음을 재생하여 사용자가 상기 대상음을 들을 수 있게 하는 제2수단과, 상기 전기적신호의 진폭레벨을 검출하며, 상기 전기적신호의 검출된 진폭레벨이 소정의 진폭레벨스레숄드보다 높을때 제2수단의 동작을 순간적이고 반복적으로 중단시키므로 상기 제2수단이 사용자의 속귀에 해를 끼칠 정도의 너무 높은 강도의 음을 발생하는 것을 방지하는 제3수단으로 구성되는 것을 특징으로 하는 전자청진기.
  15. 제14항에 있어서, 상기 제3수단은 펄스를 발생하기 위한 펄스발생기와 전기적신호의 진폭레벨이 상기소정의 진폭레벨스레숄드보다 높을때 상기 펄스발생기를 동작시키는 진폭레벨검출기로 구성되며, 상기 제2수단은 상기 펄스발생기로부터의 펄스를 공급받으며 상기 펄스에 따라서 온, 오프절환되어 사용자에게 청진기가 동작하는 느낌을 주는 한편 재생된 음의 레벨을 줄이기 위한 전기적신호가청주파증폭기로 구성되는 것을 특징으로 하는 전자청진기.
  16. 환자신체내에서 발생되는 대상음을 감지하고 상기 대상음을 전기적신호로 변환하기 위한 제1수단으로서, (a) 상기 제1수단은 사용자의 손에 의해 조작되며, 상기 전기적신호는 제1수단의 조작시에 사용자의 손의 무의식적인 떨림동작에 의해 발생되는 제1저주파수소음을 포함하고, 상기 제1소음과 상기 대상음은 모두 제1공통저주파수범위내의 주파수성분을 가지며, (b) 상기 제1수단은 외부의 주위음을 감지할 수 있으므로 상기 전기적신호는 상기 외부의 주위음에 의해 발생된 제2소음을 포함하며, 상기 제2소음과 상기 대상음은 모두 제2공통주파수범위내의 주파수성분을 가지도록 된 제1수단과, 상기 제 1 및 제2공통주파수범위의 상기 전기적신호를 감쇠하기 위한 제2수단으로서, 상기 제2수단은 (a) 상기 전기적신호로부터 상기 제1범위의 상당부분을 필터링하고 상기 제1범위의 고주파수의 음성분의 상당부분을 통과시키기 위한 제1필터부와, (b) 주파수에 따른 인간의 귀의 감도의 변화를 고려하여 상기 제2소음성분의 감쇠와 상기 제2범위내의 상기 음성분의 통과를 최적화하기에 적합한 주파수를 갖는 제2필터부로 구성되는 제2수단과, 제2수단으로부터의 상기 전기신호에 따라서 상기 대상음을 재생시켜 사용자가 상기 대상음을 들을 수 있게 하는 제3수단으로 구성되는 것을 특징으로 하는 전자청진기.
  17. 제16항에 있어서, 상기 대상음은 제3고주파수범위내의 주파수성분을 갖는 기계적심장판막에 의해 발생된 음으로 구성되며, 상기 제2수단은 상기 제3범위내의 상기 주파수성분을 통과시키기 위해 상기 제1 및 제3수단사이에 개재된 지 3필터부로 구성되며, 상기 전자청진기는 또한 제3필터부로부터의 상기 주파수성분을 제2수단에 전달하여 상기 기계적심장판막의 음을 재생하기 위해 제3범위의 상기 주파수성분의 검출에 응답하는 제4수단으로 구성되는 것을 특징으로 하는 전자청진기.
  18. 제17항에 있어서, 상기 전자청진기는 또한 상기 전기적신호의 진폭레벨을 검출하여 상기 전기적신호의 검출된 진폭레벨이 소정의 진폭레벨스레숄드보다 높을때 제3수단의 동작을 순간적이고 반복적으로 중단시킴으로써 상기 제3수단이 사용자의 속귀를 해칠 수 있을 정도의 너무 높은 강도의 음을 발생하는 것을 방지하기 위한 제5수단으로 구성되는 것을 특징으로 하는 전자청진기.
  19. 제17항에 있어서, 상기 제2필터부는 다이아프램모드 또는 벨모드에서 동작할 수 있으며, 상기 전자청진기는 또한 제2필터부의 벨모드 또는 다이아프램모드를 선택하기 위한 수단과, 다이아프램모드가 선택되었을때 제3필터부가 동작하게 하는 수단과, 상기 벨모드가 선택되었을때 상기 제3필터부를 디스에이블시키기 위한 수단으로 구성되는 것을 특징으로 하는 전자청진기.
  20. 제17항에 있어서, 상기 제2 및 제3필터부는 평행하게 연결되며, 상기 제1필터부는 상기 평행하게 연결된 제2 및 제3필터부에 연속적으로 연결되는 것을 특징으로 하는 전자청진기.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019950702306A 1992-12-07 1993-12-07 전자청진기 KR950703891A (ko)

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