JPS59500552A - blood vessel substitute - Google Patents

blood vessel substitute

Info

Publication number
JPS59500552A
JPS59500552A JP58501101A JP50110183A JPS59500552A JP S59500552 A JPS59500552 A JP S59500552A JP 58501101 A JP58501101 A JP 58501101A JP 50110183 A JP50110183 A JP 50110183A JP S59500552 A JPS59500552 A JP S59500552A
Authority
JP
Japan
Prior art keywords
transducer
blood vessel
vessel substitute
tube
transducers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP58501101A
Other languages
Japanese (ja)
Inventor
フ−ド・ロバ−ト・ゴ−ドン
Original Assignee
ジエイ．アンド　ピ−．コ−ツ，リミテツド
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ジエイ．アンド　ピ−．コ−ツ，リミテツド filed Critical ジエイ．アンド　ピ−．コ−ツ，リミテツド
Publication of JPS59500552A publication Critical patent/JPS59500552A/en
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
    • A61B5/6867—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive specially adapted to be attached or implanted in a specific body part
    • A61B5/6876—Blood vessel
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
    • A61B5/0031—Implanted circuitry
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
    • A61B5/6879—Means for maintaining contact with the body
    • A61B5/6884—Clamps or clips
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/06—Measuring blood flow
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
    • A61F2/06—Blood vessels

Abstract

(57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。 (57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 血管代用物 本発明は血管代用物組立体に係り、具体的には、人間又は動物の体内の血管の一 部分を交換するのに用いられるようにされた筒状移植組織片を組込んでいる代用 物組立体に係る。[Detailed description of the invention] blood vessel substitute The present invention relates to a blood vessel substitute assembly, and specifically relates to a blood vessel substitute assembly in a human or animal body. Substitutes incorporating tubular grafts adapted to be used to replace parts Pertains to object assemblies.

血管代用物の用途は成る種の生物学的健康状態の治療において次第に広範１ｃな ってきているが、しかしながら、現在では、このような代用物は単に血管の代わ シとして用いられているに過ぎない。換言すれば、代用物が血管内に移植組織片 として一旦挿入されてしまった後は、外科的検査を実際に行うことなく、血管内 で実際に何が起っているのか知る方法は無い。The use of vascular substitutes is becoming increasingly widespread in the treatment of a variety of biological health conditions. However, at present, such substitutes are simply a substitute for blood vessels. It is only used as a sign. In other words, if the surrogate is an intravascular graft Once it has been inserted as a There's no way to know what's actually going on.

血管代用物を装着している患者を、代用物装着後に外科的検査を行う必要なく監 視することができたら極めて有利であシ、あるいは、患者の血液の状態に従って 自動的に他の関連した器管に対する反応を自動制御で調べることができたら極め て有利である。本発明の目的は、これらの要望を可能ならしめる代用物を提供す ることである。Monitor patients with vascular substitutes without the need for surgical examination after the substitute is in place. It would be extremely advantageous to be able to see It would be extremely useful if we could automatically examine reactions to other related organs under automatic control. It is advantageous. The purpose of the present invention is to provide an alternative that makes these desires possible. Is Rukoto.

本発明による血管代用物組立体は、監視されるべき複数の状態のうちの少なくと も１つに敏感な少なくとも１つの変換器を組込んでいる織物材料でなるチューブ を有しており、その変換器の感知部分がチューブの２ 内部に晒されるようにその変換器はチューブに取付けられており、血管代用物組 立体はまた、変換器が接続されている伝達装置を有しており、その伝達装置は代 用物を通って流れている血液の状態に関しての情報を担持している無線信号を伝 達するべく構成されている。Vascular substitute assemblies according to the present invention are capable of detecting at least one of a plurality of conditions to be monitored. a tube of textile material incorporating at least one transducer sensitive to The sensing part of the transducer is located between the two tubes. The transducer is attached to the tube so that it is exposed to the inside of the vascular substitute assembly. The solid body also has a transmission device to which the transducer is connected, which transmission device transmits radio signals carrying information about the condition of the blood flowing through the object. It is designed to reach.

代用物は、夫々異なる特性に対し敏感な複数個の変換器を組込んでいてもよい。An alternative may incorporate multiple transducers, each sensitive to different characteristics.

例えば、血圧に敏感な変換器が組込まれていてもよく、血液のＰＨ値に敏感な変 換器が組込まれていてもよく、温度に敏感な変換器が組込まれていてもよい。代 用物内には軸線方向に互いに離隔された２つの変換器が組込まれていてもよく、 −万の変換器は音発生用変換器であり、他方の変換器は受音変換器であり、また 、例えばドツプラー効果を用いることにより、代用物を通る血液の流量を調べる ことができるコンピュータ装置も備えられていてもよい。For example, a transducer sensitive to blood pressure may be incorporated, and a transducer sensitive to blood pH may be incorporated. Converters may be incorporated, and temperature sensitive transducers may be incorporated. teenager Two axially spaced transducers may be incorporated within the object; - One transducer is a sound-generating transducer, the other transducer is a sound-receiving transducer, and , find out the flow rate of blood through the surrogate, for example by using the Doppler effect Computer equipment capable of doing this may also be provided.

上記複数の変換器は代用物の構造体内に組込まれていてもよく、あるいは生物学 的上適合性のある接着剤によりその代用物に取付けられていてもよい。The plurality of transducers may be incorporated within a surrogate structure or biological It may be attached to its substitute by a virtually compatible adhesive.

変換器によって生せしめられた信号は、身体から成る距離だけ離れた所で、その 身体の外側に置かられた受信器（（よって受信されるようになっていてもよく、 あるいは上記信号は身体の他の器管（で置かれた受信器によって受信されるよう になっていてもよく、その受信器は受信した信号に従って作動してその器管を興 奮７１表昭５９−５００５５２　（２） させ、そればより、代用物内の変換器によって感知された成る望ましからざる作 用又は傾向を補償するよう構成されていてもよい。The signal produced by the transducer is transmitted to the body at a distance of A receiver placed outside the body (which may be adapted to receive Alternatively, the signal may be received by a receiver placed in another organ of the body. The receiver may actuate according to the received signal to activate the instrument. Iku 71 table 1977-500552 (2) The more undesirable effects are detected by the transducer in the surrogate, the more It may also be configured to compensate for trends or trends.

本発明の具体的実施例は添付図面に示されており、その図面中１は代用物を構成 する織物材料でなるチューブを示し、２は監視されるべき特性に対し敏感な変換 器を示している。また、２つの変換器３及び４のうちの一方は音信号を発するこ とができ、他方は音信号を受信することかできる。５ば、変換器３及び４の作動 を制俳するようにされたマイクロコンピュータ−の形をしたコンピューター装置 を示している。６（は変換器からの信号及びマイクロコンピュータ−からの信号 を、無線信号として伝達するべく構成された無線伝達器を示している。図示実施 例において、伝達器及びマイクロコンピュータ−は、遠隔点に置くことができる 別個のカプセル内に組込まれており、例えばそのカフ０セルは、容易に近付くこ とができるよう皮下に：置＜ことかできる。しがしながら、伝達器及びマイクロ コンビニーターは別個のカプセル内に、あるいは同じカプセル内に置かれていて もよく、該カプセルは移植組織片上に、あるいは他の便利な場所に置かれてぃて もよい。Specific embodiments of the invention are illustrated in the accompanying drawings, in which 1 constitutes a substitute. 2 shows a tube made of a textile material that has a transformation sensitive to the property to be monitored. It shows the vessel. Also, one of the two transducers 3 and 4 is capable of emitting a sound signal. and the other can receive sound signals. 5. Operation of converters 3 and 4 A computer device in the form of a microcomputer designed to control It shows. 6 (is the signal from the converter and the signal from the microcomputer) 1 shows a wireless transmitter configured to transmit as a wireless signal. Illustrated implementation In an example, the transmitter and microcomputer can be located at a remote location. Built into a separate capsule, e.g. its cuff 0 cell is easily accessible. It can be placed subcutaneously so that it can be used. However, the transmitter and micro Combinators can be placed in separate capsules or in the same capsule. Optionally, the capsule is placed on the graft or other convenient location. Good too.

近代科学技術の進歩の結果、現在では、血管代用物の作動に対し有害な影響を及 ぼすことなくその代用物に組込まれるのに光分率さな変換器、無線伝達器及び手 続補正書（方式） 昭和５９年１月３０日 特許庁長官殿 １、事件の表示 ”　ＰＣＴ　ａＢ”ｓ３／″０ｏｏｓ９２、発明の名称 ｋｆへ掲剰 ３、補正をする者 事件との関醪　持１：′「出願人 ４、代理人 昭和５９年　１月２４日 ６、補正により増加する発明の数As a result of advances in modern science and technology, there are now Transducers, wireless transmitters and handsets that can be incorporated into their substitutes without compromising the light fraction. Continuation amendment (method) January 30, 1980 Commissioner of the Patent Office 1.Display of the incident "PCT aB"s3/"0oos92, title of the invention Posted to kf 3. Person who makes corrections Relationship with the case 1: 'Applicant 4. Agent January 24, 1982 6. Number of inventions increased by amendment

Claims (1)

【特許請求の範囲】 １　織物材料でなるチューブ（１）を有している血管代用物組立体において、前 記チューブは監視されるべき複数の状態のうちの少なくとも１つの状態に対し敏 感な少なくとも１つの変換器（２又は３，４）を組込んでおり、該変換器は、該 変換器の感知部分が前記チューブの内部（・て晒されるよう該チューブの壁知取 付けられでおり、前記チューブはまた、無線伝達器（６）を組込んでおシ、・前 記変換器は該無線伝達器１Ｃ接続されており、該無線伝達器は血管代用物を通っ て流れている血液の状態゛に関する情報を担持している無線信号を伝達するべく 構成されていることを特徴とする血管代用物組立体。 ２　請求の範囲第１項記載の血管代用物組立体において、血管代用物盲軸線方向 に互いに離隔された２つの変換器（３，４）を組込んでおり、これら２つの変換 器のうちの一方の変換器（３又は４）は音発生用変換器で、他方の変換器（４又 Ｕ７ｉ３）は受音変換器であり、前記血管代用物はまた、例えはドツプラー効果 を用いることにより該血管代用物を通る血液の流量を調べることができるコンピ ューター装置（５）を組込んでいることを特徴とする血管代用物組立体。[Claims] 1 In a blood vessel substitute assembly having a tube (1) made of a textile material, the front The tube is sensitive to at least one of a plurality of conditions to be monitored. at least one transducer (2 or 3, 4) with a Mount the wall of the tube so that the sensing part of the transducer is exposed to the interior of the tube. The tube also incorporates a wireless transmitter (6) and is attached to the front. The transducer is connected to the wireless transmitter 1C, and the wireless transmitter passes through the blood vessel substitute. to transmit radio signals carrying information about the state of the blood flowing through the body. A blood vessel substitute assembly comprising: 2. In the blood vessel substitute assembly according to claim 1, the direction of the blind axis of the blood vessel substitute is incorporates two transducers (3, 4) spaced apart from each other, and these two transducers One of the transducers (3 or 4) is a sound generation transducer, and the other transducer (4 or 4) is a sound generation transducer. U7i3) is a sound receiving transducer, and the vascular surrogate is also a transducer, e.g. A computer that can examine the flow rate of blood through the blood vessel substitute by using A blood vessel substitute assembly, characterized in that it incorporates a computer device (5).
JP58501101A 1982-03-25 1983-03-24 blood vessel substitute Pending JPS59500552A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8208865 1982-03-25
GB8208865REGB 1982-03-25

Publications (1)

Publication Number Publication Date
JPS59500552A true JPS59500552A (en) 1984-04-05

Family

ID=10529290

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58501101A Pending JPS59500552A (en) 1982-03-25 1983-03-24 blood vessel substitute

Country Status (7)

Country Link
EP (1) EP0103608A1 (en)
JP (1) JPS59500552A (en)
DK (1) DK531883A (en)
ES (1) ES8403311A1 (en)
GR (1) GR77132B (en)
IT (2) IT8335710V0 (en)
WO (1) WO1983003348A1 (en)

Families Citing this family (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2596950B1 (en) * 1986-04-11 1988-11-18 Huneau Jacques MONITORING DEVICE FOR MONITORING MOBILE DISCRETE ELEMENTS, MONITORING SYSTEM COMPRISING SUCH DEVICES AND THEIR USE IN STABLE MANAGEMENT
JPH0433647A (en) * 1990-05-30 1992-02-05 Shigeru Saito Artificial tooth root
WO1992015241A1 (en) * 1991-03-04 1992-09-17 Kensey Nash Corporation Apparatus and method for determining in vivo the instantaneous velocity of the flow of blood in a living being
WO1992015240A1 (en) * 1991-03-04 1992-09-17 Kensey Nash Corporation Determining the instantaneous shear stress on the wall of a blood vessel
NL9401690A (en) * 1994-10-13 1996-05-01 Industrial Res Bv Body-implantable stent.
EP0897690B1 (en) 1997-08-15 2013-04-24 Academisch Ziekenhuis Leiden h.o.d.n. LUMC Pressure sensor for use in an aneurysmal sac
US5967986A (en) * 1997-11-25 1999-10-19 Vascusense, Inc. Endoluminal implant with fluid flow sensing capability
US6331163B1 (en) 1998-01-08 2001-12-18 Microsense Cardiovascular Systems (1196) Ltd. Protective coating for bodily sensor
SG71881A1 (en) * 1998-01-08 2000-04-18 Microsense Cardiovascular Sys Method and device for fixation of a sensor in a bodily lumen
AU3790700A (en) * 1998-11-25 2000-06-19 Ball Semiconductor Inc. Intraluminal monitoring system
GB2344053A (en) * 1998-11-30 2000-05-31 Imperial College Stents for blood vessels
US6308715B1 (en) * 1999-03-24 2001-10-30 Pmd Holdings Corp. Ultrasonic detection of restenosis in stents
US6309350B1 (en) * 1999-05-03 2001-10-30 Tricardia, L.L.C. Pressure/temperature/monitor device for heart implantation
US6699186B1 (en) 2000-03-10 2004-03-02 Remon Medical Technologies Ltd Methods and apparatus for deploying and implantable biosensor
US6840956B1 (en) 2000-03-10 2005-01-11 Remon Medical Technologies Ltd Systems and methods for deploying a biosensor with a stent graft
US6416474B1 (en) 2000-03-10 2002-07-09 Ramon Medical Technologies Ltd. Systems and methods for deploying a biosensor in conjunction with a prosthesis
US6783499B2 (en) 2000-12-18 2004-08-31 Biosense, Inc. Anchoring mechanism for implantable telemetric medical sensor
US6638231B2 (en) 2000-12-18 2003-10-28 Biosense, Inc. Implantable telemetric medical sensor and method
US6652464B2 (en) 2000-12-18 2003-11-25 Biosense, Inc. Intracardiac pressure monitoring method
US6746404B2 (en) 2000-12-18 2004-06-08 Biosense, Inc. Method for anchoring a medical device between tissue
US6855115B2 (en) 2002-01-22 2005-02-15 Cardiomems, Inc. Implantable wireless sensor for pressure measurement within the heart
US7261733B1 (en) 2002-06-07 2007-08-28 Endovascular Technologies, Inc. Endovascular graft with sensors design and attachment methods
US7488345B2 (en) 2002-06-07 2009-02-10 Endovascular Technologies, Inc. Endovascular graft with pressor and attachment methods
US7399313B2 (en) 2002-06-07 2008-07-15 Brown Peter S Endovascular graft with separable sensors
US7025778B2 (en) 2002-06-07 2006-04-11 Endovascular Technologies, Inc. Endovascular graft with pressure, temperature, flow and voltage sensors
US7147604B1 (en) 2002-08-07 2006-12-12 Cardiomems, Inc. High Q factor sensor
CA2539261C (en) 2003-09-16 2011-05-17 Cardiomems, Inc. Implantable wireless sensor
US8026729B2 (en) 2003-09-16 2011-09-27 Cardiomems, Inc. System and apparatus for in-vivo assessment of relative position of an implant
US7572228B2 (en) 2004-01-13 2009-08-11 Remon Medical Technologies Ltd Devices for fixing a sensor in a lumen
US7918800B1 (en) 2004-10-08 2011-04-05 Endovascular Technologies, Inc. Aneurysm sensing devices and delivery systems
US10390714B2 (en) 2005-01-12 2019-08-27 Remon Medical Technologies, Ltd. Devices for fixing a sensor in a lumen
CA2613241A1 (en) 2005-06-21 2007-01-04 Cardiomems, Inc. Method of manufacturing implantable wireless sensor for in vivo pressure measurement
US8676349B2 (en) 2006-09-15 2014-03-18 Cardiac Pacemakers, Inc. Mechanism for releasably engaging an implantable medical device for implantation
US20080108930A1 (en) * 2006-11-03 2008-05-08 The Regents Of The University Of Michigan Methods and Systems for Determining Volume Flow in a Blood or Fluid Conduit, Motion, and Mechanical Properties of Structures Within the Body
JP2010528814A (en) 2007-06-14 2010-08-26 カーディアック ペースメイカーズ， インコーポレイテッド Multi-element acoustic recharging system
JP5362828B2 (en) 2008-07-15 2013-12-11 カーディアック ペースメイカーズ， インコーポレイテッド Implant assist for an acoustically enabled implantable medical device
WO2010093489A2 (en) 2009-02-13 2010-08-19 Cardiac Pacemakers, Inc. Deployable sensor platform on the lead system of an implantable device
US8475372B2 (en) 2010-10-29 2013-07-02 Medtronic Vascular, Inc. Implantable medical sensor and fixation system
US8864676B2 (en) 2010-10-29 2014-10-21 Medtronic Vascular, Inc. Implantable medical sensor and fixation system
US8727996B2 (en) 2011-04-20 2014-05-20 Medtronic Vascular, Inc. Delivery system for implantable medical device
ES2393878B1 (en) * 2011-06-13 2013-11-06 Universidad Europea De Madrid, S.L.U. ENDOFUGAS DETECTOR DEVICE FOR ENDOPROTESIS.
US9351648B2 (en) 2012-08-24 2016-05-31 Medtronic, Inc. Implantable medical device electrode assembly
US9757574B2 (en) 2015-05-11 2017-09-12 Rainbow Medical Ltd. Dual chamber transvenous pacemaker

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986828A (en) * 1974-03-05 1976-10-19 Meadox Medicals, Inc. Polymer fabric compacting process
FR2352286A1 (en) * 1976-05-21 1977-12-16 Inst Nat Sante Rech Med Ultrasonic Doppler effect directional flowmeter - has ultrasonic transmitter, receiving transducer and analyser linked electromagnetically to receiver
US4190057A (en) * 1977-12-27 1980-02-26 Thoratec Laboratories Corporation Device for determining the patentcy of a blood vessel

Also Published As

Publication number Publication date
EP0103608A1 (en) 1984-03-28
WO1983003348A1 (en) 1983-10-13
DK531883D0 (en) 1983-11-21
ES520933A0 (en) 1984-03-16
DK531883A (en) 1983-11-21
GR77132B (en) 1984-09-07
IT8347995A0 (en) 1983-03-25
ES8403311A1 (en) 1984-03-16
IT8335710V0 (en) 1983-03-25

Similar Documents

Publication Publication Date Title
JPS59500552A (en) blood vessel substitute
US4354501A (en) Esophageal catheter including ultrasonic transducer for use in detection of air emboli
US5025809A (en) Recording, digital stethoscope for identifying PCG signatures
US20080146276A1 (en) Mobile Phone With A Stethoscope
US4354500A (en) System using ultrasonic energy for detection and quantification of air emboli
US6878117B1 (en) Handheld sensor for acoustic data acquisition
DE69833191D1 (en) DRUCKWANDLER WITH COUPLING FOR UNIQUE USE
KR970020056A (en) Patient monitor device
ATE267551T1 (en) ULTRASONIC IMAGING CATHETER
BR0308728A (en) Medical finding and diagnostic apparatus
MXPA06000952A (en) Bio-filter pad for facilitating the detection of an occurence of a physiological action .
DE68925358D1 (en) STETHOSCOPE WITH ACOUSTIC REINFORCEMENT
JPS63501618A (en) stethoscope with electric filter
US4048444A (en) Phonostethoscope conversion unit for amplification and clarification of corporeal sounds
CN102228382A (en) Wireless auscultation system
US3499434A (en) Device for measuring and/or recording intracardiac pressure and sounds
NO20030072D0 (en) Device for non-invasive ultrasound treatment of disc disease
IL123516A0 (en) Device for transmitting emergency or diagnostic signal
US5959261A (en) Stereophonic stethoscope
US4633971A (en) Stethoscope with high frequency filter
Siegenthaler et al. A speech reception threshold test for children
Sarazan et al. Standing on the shoulders of giants: Dean Franklin and his remarkable contributions to physiological measurements in animals
JPH0928702A (en) Electronic stethoscopic device
TW388706B (en) An apparatus for measuring blood velocity in a blood vessel of a patient
US11617514B2 (en) Hands free heart-beat audio transmitter and receiver system for exercise, meditation and relaxation