K Number
K014182
Manufacturer
Date Cleared
2002-01-03

(14 days)

Product Code
Regulation Number
892.1570
Reference & Predicate Devices
Predicate For
N/A
AI/MLSaMDIVD (In Vitro Diagnostic)TherapeuticDiagnosticis PCCP AuthorizedThirdpartyExpeditedreview
Intended Use

The TETRAD Model TC-C52-, -C84V-, -C95-, -CLA76-, -L74-ATP Transducers are intended for diagnostic ultrasound imaging or fluid flow analysis of the human body; specific indications for use are tabulated in Section 4.3 of this submission.

Device Description

Technical specifications for the Model TC-C52-, -C84V-, -C95-, -CLA76-, -L74-ATP Transducers are as follows:

SpecificationsTetrad TC-C52-ATPTetrad TC-C84V-ATPTetrad TC-C95-ATPTetrad TC-CLA76-ATPTetrad TC-L74-ATP
Center Frequency3.0 MHznominal6.0 MHznominal6.0 MHznominal4.0 MHznominal6.0 MHznominal
Number of Elements128128128128128
Radius of Curvature40 mm12 mm8 mm76 mmNA
Bandwidth -6dB70% nominal60% nominal60% nominal50% nominal>50%
Elevation width15 mm5.5 mm4 mm15 mm5.5 mm
Elevation Focus80 mm25 mm25 mm75 mm25 mm
Lens materialsiliconeSiliconesiliconesiliconesilicone
Pitch0.3 mm0.2 mm0.15 mm0.6 mm0.2 mm
AI/ML Overview

The provided 510(k) summary (K0191182) describes the submission for “TETRAD Model TC-C52-, -C84V-, -C95-, -CLA76-, -L74-ATP Transducers.” This document focuses on demonstrating substantial equivalence to existing predicate devices rather than proving a device meets specific performance criteria through a detailed clinical study.

Therefore, many of the requested information points, such as specific acceptance criteria for diagnostic performance, sample sizes for test sets, expert qualifications, adjudication methods, MRMC studies, standalone algorithm performance, and training set details, are not applicable or available in this type of submission.

The primary "study" that proves the device meets acceptance criteria in a 510(k) for a diagnostic ultrasound transducer is a comparison to a legally marketed predicate device and a demonstration that the new device is "substantially equivalent" in terms of technological characteristics and intended use.

Here's a breakdown of the requested information based on the provided document:

1. Table of Acceptance Criteria and Reported Device Performance

The acceptance criteria for this submission are based on demonstrating substantial equivalence to the predicate devices (ATL HDI 3000 and HDI 5000 Systems transducers C5-2, C8-4V, C9-5, C3.5, R76, L7-4). The "performance" is a comparison of technical specifications and the conclusion that the new transducers are functionally similar and have the same intended uses.

Performance Metric / Criteria CategoryAcceptance Criteria (Substantial Equivalence)Reported Device Performance (TETRAD Transducers)
Functional SimilarityThe device must be functionally similar to the predicate devices. This implies that their operating principles, mechanisms of action, and intended effects on the patient or user are comparable.The TETRAD transducers are stated to be "functionally similar" to the corresponding ATL products.
Intended UseThe device must have the same intended uses as the predicate devices. The listed clinical applications and modes of operation must align.The TETRAD transducers have the "same intended uses" as the corresponding predicate transducers. Specific indications for use (clinical application, modes of operation) are tabulated in Section 4.3 of the submission (refer to pages 5-9 of the provided document for detailed tables for each transducer model), demonstrating alignment with the predicate ATL transducers. Many applications are marked "N1" which signifies "new indication: predicate (ATL C5-2) cleared for this use with ATL HDI 3000 and ATL HDI 5000", confirming the intended use matches that cleared for the predicate.
Technical SpecificationsWhile not explicitly "acceptance criteria" in the sense of a numerical pass/fail, the technical specifications of the new device are compared to the predicate to demonstrate that any differences do not raise new questions of safety or effectiveness. The general expectation is that key specifications associated with image quality and safety are comparable.TETRAD Model TC-C52-ATP: Center Frequency: 3.0 MHz nominal; Elements: 128; Radius of Curvature: 40 mm; Bandwidth -6dB: 70% nominal; Elevation width: 15 mm; Elevation Focus: 80 mm; Lens material: silicone; Pitch: 0.3 mm. TETRAD Model TC-C84V-ATP: Center Frequency: 6.0 MHz nominal; Elements: 128; Radius of Curvature: 12 mm; Bandwidth -6dB: 60% nominal; Elevation width: 5.5 mm; Elevation Focus: 25 mm; Lens material: Silicone; Pitch: 0.2 mm.TETRAD Model TC-C95-ATP: Center Frequency: 6.0 MHz nominal; Elements: 128; Radius of Curvature: 8 mm; Bandwidth -6dB: 60% nominal; Elevation width: 4 mm; Elevation Focus: 25 mm; Lens material: silicone; Pitch: 0.15 mm.TETRAD Model TC-CLA76-ATP: Center Frequency: 4.0 MHz nominal; Elements: 128; Radius of Curvature: 76 mm; Bandwidth -6dB: 50% nominal; Elevation width: 15 mm; Elevation Focus: 75 mm; Lens material: silicone; Pitch: 0.6 mm.TETRAD Model TC-L74-ATP: Center Frequency: 6.0 MHz nominal; Elements: 128; Radius of Curvature: NA; Bandwidth -6dB: >50%; Elevation width: 5.5 mm; Elevation Focus: 25 mm; Lens material: silicone; Pitch: 0.2 mm.The document explicitly states: "The acoustic output levels of the TETRAD Transducers are equal to or slightly lower than those of their respective corresponding ATL Transducers." This is a key safety comparison.
Acoustic Output LevelsAcoustic output levels should be comparable to or lower than the predicate devices to ensure safety.Stated to be "equal to or slightly lower than those of their respective corresponding ATL Transducers." A post-clearance special report is required to provide complete acoustic output measurements based on production line devices (Appendix G, Sept 30, 1997 guidance). This indicates a commitment to meet the safety thresholds outlined in that guidance.
Differences from PredicateAny differences from the predicate device must not raise new questions of safety or effectiveness. The only substantive differences found during prior clearance (K002193 for TC-C3-ATP) were deemed acceptable.The only substantive differences identified were related to the acoustic output levels, which were determined to be equal to or slightly lower than the predicate, thus not raising new questions of safety or effectiveness.

2. Sample Size Used for the Test Set and the Data Provenance

  • Sample Size for Test Set: Not applicable. This 510(k) submission does not describe a clinical trial with a "test set" of patients or images for diagnostic performance evaluation in the way an AI/CADe device would. The evaluation is based on comparing technical specifications and intended use to predicate devices already on the market.
  • Data Provenance: Not applicable for a typical "test set" as defined for diagnostic performance. The data provenance for the comparison essentially refers to the existing regulatory clearances and technical specifications of the predicate ATL devices (ATL HDI 3000 and HDI 5000 Systems).

3. Number of Experts Used to Establish the Ground Truth for the Test Set and Their Qualifications

  • Number of Experts: Not applicable. No dedicated "ground truth" establishment by experts for a test set is described in this type of submission for ultrasound transducers.
  • Qualifications of Experts: Not applicable.

4. Adjudication Method for the Test Set

  • Adjudication Method: Not applicable. No clinical test set requiring adjudication is described.

5. If a Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study Was Done

  • MRMC Study: No, an MRMC study was not done. This type of study is not relevant for demonstrating substantial equivalence of an ultrasound transducer in a 510(k) submission focused on technical specifications and intended use comparison. MRMC studies are typically used for assessing the impact of AI/CADe devices on human reader performance.
  • Effect Size of Human Readers Improve: Not applicable.

6. If a Standalone (i.e., algorithm only without human-in-the-loop performance) Study Was Done

  • Standalone Study: No, a standalone study was not done. This device is an ultrasound transducer, a hardware component, not an algorithm. Its performance is inherent to its physical and electronic characteristics when connected to an ultrasound system.

7. The Type of Ground Truth Used

  • Type of Ground Truth: Not applicable. No "ground truth" derived from expert consensus, pathology, or outcomes data is used in this submission to evaluate the transducer's diagnostic performance in the context of clinical accuracy. The "ground truth" for substantial equivalence is the existing regulatory clearance and established safety/effectiveness profile of the predicate devices based on their technical specifications and intended uses.

8. The Sample Size for the Training Set

  • Sample Size for Training Set: Not applicable. This is not an AI/ML device that requires a training set.

9. How the Ground Truth for the Training Set Was Established

  • Ground Truth for Training Set: Not applicable.

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K0191182

JAN 0 3 2002

510(k) Summary for TETRAD Model TC-C52-, -C84V-, -C95-, -CLA76-, -L74-ATP Transducers

  • SPONSOR 1.
    TETRAD Corporation 357 Inverness Drive, Suite A. Englewood, CO 80112-5866

Charles F. Hottinger, Ph.D., RAC, Contact Person: Regulatory Affairs Consultant

Telephone: 408-741-1006

November 27, 2001 Date Prepared:

2. DEVICE NAME

Proprietary Name:

Common/ Usual Name:

TETRAD Model TC-C52-, -C84V--L74-ATP Transducers Ultrasound Transducers

Diagnostic Ultrasound Transducer Classification Name: (21 CFR 892.1570, 90-ITX)

3. PREDICATE DEVICES

ATL HDI 3000 and HDI 5000 Systems (including Transducers C5-2, C8-4V, C9-5, C3.5, R76, L7-4. The C5-2 and L7-4 were most recently cleared for use with the HDI 5000 under K002003.

INTENDED USE 4.

The TETRAD Model TC-C52-, -C84V-, -C95-, -CLA76-, -L74-ATP Transducers are intended for diagnostic ultrasound imaging or fluid flow analysis of the human body; specific indications for use are tabulated in Section 4.3 of this submission.

RA

5. DEVICE DESCRIPTION

Technical specifications for the Model TC-C52-, -C84V-, -C95-, -CLA76-, -L74-ATP Transducers are as follows:

SK50

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SpecificationsTetrad TC-C52-ATPTetrad TC-C84V-ATPTetrad TC-C95-ATPTetrad TC-CLA76-ATPTetrad TC-L74-ATP
Center Frequency3.0 MHznominal6.0 MHznominal6.0 MHznominal4.0 MHznominal6.0 MHznominal
Number of Elements128128128128128
Radius of Curvature40 mm12 mm8 mm76 mmNA
Bandwidth -6dB70% nominal60% nominal60% nominal50% nominal>50%
Elevation width15 mm5.5 mm4 mm15 mm5.5 mm
Elevation Focus80 mm25 mm25 mm75 mm25 mm
Lens materialsiliconeSiliconesiliconesiliconesilicone
Pitch0.3 mm0.2 mm0.15 mm0.6 mm0.2 mm

BASIS FOR SUBSTANTIAL EQUIVALENCE 6.

The TETRAD Model TC-C52-, -C84V-, -C95-, -CLA76-, -L74-ATP Transducers are substantially equivalent to the corresponding ATL products which are currently in commercial distribution in the United States, since the subject devices are functionally similar and have the same intended uses as the corresponding predicate transducers. The only substantive differences being the following points that were determined during the clearance of the TC-C3-ATP (an equivalent to the Acuson C3 Transducer) under K002193.

The acoustic output levels of the TETRAD Transducers are equal to or slightly lower than those of their respective corresponding ATL Transducers.

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Image /page/2/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a stylized caduceus symbol, which is a staff with two snakes coiled around it, and the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" arranged in a circular fashion around the symbol. The text is in all caps and is evenly spaced around the circle.

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

JAN 0 3 2002

TETRAD Corporation % Mr. Mark Job TÜV Product Services, Inc. 1775 Old Highway 8 NW Suite 104 NEW BRIGHTON MN 55112-1891 '

Re: K014182

Trade Name: TETRAD Transducer Models: TC-C52-ATP, TC-C84V-ATP, TC-C95-ATP,

TC-CLA76-ATP, TC-L74-ATP

Regulation Number: 21 CFR 892.1570 Regulation Name: Diagnostic ultrasound transducer Regulatory Class: II Product Code: 90 ITX Dated: December 19, 2001 Received: December 20, 2001

Dear Mr. Job:

We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.

This determination of substantial equivalence applies to the following transducers intended for use with the ATL HDI 3000 and HDI 5000 Diagnostic Ultrasound Systems, as described in your premarket notification:

Transducer Model Number

TC-C52-ATP TC-C84V-ATP TC-C95-ATP TC-CLA76-ATP TC-L74-ATP

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If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register. may pacinst is at that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.

This determination of substantial equivalence is granted on the condition that prior to shipping the first device, you submit a postclearance special report. This report should contain complete information, including acoustic output measurements based on production line devices, requested in Appendix G, (enclosed) of the Center's September 30, 1997 "Information for Manufacturers Seeking Marketing Clearance of Diagnostic Ultrasound Systems and Transducers." If the special report is incomplete or contains unacceptable values (e.g., acoustic output greater than approved levels), then the 510(k) clearance may not apply to the production units which as a result may be considered adulterated or misbranded.

The special report should reference the manufacturer's 510(k) number. It should be clearly and prominently marked "ADD-TO-FILE" and should be submitted in duplicate to:

Food and Drug Administration Center for Devices and Radiological Health Document Mail Center (HFZ-401) 9200 Corporate Boulevard Rockville, Maryland 20850

This letter will allow you to begin marketing your device as described in your premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus permits your device to proceed to market.

If you desire specific advice for your device on our labeling regulation (21 CFR Part 801, please contact the Office of Compliance at (301) 594-4591. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or at (301) 443-6597 or at its Internet address "http://www.fda.gov/cdrh/dsmamain.html".

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If you have any questions regarding the content of this letter, please contact Rodrigo C. Perez at (301) 594-1212.

Sincerely yours,

Nancyc brogdon

Nancy C. Brogdon

Director, Division of Reproductive, Abdominal and Radiological Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure(s)

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ATL HDI 3000 and HDI 5000 Systems_____________________________________________________________________________________________________________________________________________ System: Transducer: TC-C52-ATP

Intended Use: Diagnostic ultrasound imaging or fluid flow analysis of the human body as follows:

Clinical ApplicationMode of Operation
General(Track I Only)Specific(Tracks I & III)BMPWDCWDColorDoppleraCombinedModesbOther
OphthalmicOphthalmic
FetalN1N1N1N1N1
AbdominalN1N1N1N1N1
Intra-operative (Specify)
Intra-operative (Neuro)
Laparoscopic
Fetal Imaging& OtherPediatric
Small Organ (Thyroid,Breast, Testes, etc.)
Neonatal Cephalic
Adult Cephalic
Trans-rectal
Trans-vaginal
Trans-urethral
Trans-esoph. (non-Card.)
Musculo-skel.(Conventional)
Musculo-skel. (Superficial)
Intra-luminal
Other (Specify)
CardiacCardiac Adult
Cardiac Pediatric
Trans-esoph. (Cardiac)
Other (Specify)
PeripheralVesselPeripheral vessel
Other (Specify)

N = new indication: predicate (ATL C5-2) cleared for this use with ATL HDI 3000 and ATL HDI 5000; a Includes Color M, Power (Ampl.) Doppler.

6B+M; B+PWD; B+Color Doppler, B+PWD+Color Doppler

(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of Center for Devices and Radiological Health, Office of Device Evaluation

Prescription Use (Per 21 CFR 801.109)

Nancy C. Brogdon
(Division Sign-Off)
Division of Reproductive, Abdominal, and Radiological Devices
510(k) NumberK014182

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System:ATL HDI 3000 and HDI 5000 Systems
Transducer:TC-C84V-ATP

I ransuccr. I O Go v 7 N
Intended Use: Diagnostic ultrasound imaging or fluid flow analysis of the human body as follows:

Clinical ApplicationMode of Operation
GeneralSpecificBMPWDCWDColorDoppleraCombinedModesbOther
(Track I Only)(Tracks I & III)
OphthalmicOphthalmic
FetalN1N1N1N1N1
Abdominal
Intra-operative (Specify)
Intra-operative (Neuro)
Laparoscopic
Fetal Imaging& OtherPediatric
Small Organ (Thyroid,Breast, Testes, etc.)
Neonatal Cephalic
Adult Cephalic
Trans-rectal
Trans-vaginalN1N1N1N1N1
Trans-urethral
Trans-esoph. (non-Card.)
Musculo-skel.(Conventional)
Musculo-skel. (Superficial)
Intra-luminal
Other (Specify)
Cardiac Adult
CardiacCardiac Pediatric
Trans-esoph. (Cardiac)
Other (Specify)
PeripheralVesselPeripheral vessel
Other (Specify)

N = new indication: predicate (ATL C8-4V) cleared for this use with ATL HDI 3000 and ATL HDI 5000; a Includes Color M, Power (Ampl.) Doppler

bB+M; B+PWD; B+Color Doppler, B+PWD+Color Doppler.

(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of Center for Devices and Radiological Health, Office of Device Evaluation

Prescription Use (Per 21 CFR 801.109)

Dancie brogdon

(Division Sign Division of Reproduct and Radiological Devic 510(k) Number

{7}------------------------------------------------

ATL HDI 3000 and HDI 5000 Systems_ System: Transducer:TC-C95-ATP Intended Use: Diagnostic ultrasound imaging or fluid flow analysis of the human body as follows:

Clinical ApplicationMode of Operation
General(Track I Only)Specific(Tracks I & III)BMPWDCWDColorDoppleraCombinedModesbOther
OphthalmicOphthalmic
FetalN1N1N1N1N1
Abdominal
Intra-operative (Specify)d
Intra-operative (Neuro)
Laparoscopic
Fetal Imaging& OtherPediatric
Small Organ (Thyroid,Breast, Testes, etc.)
Neonatal Cephalic
Adult Cephalic
Trans-rectalN1N1N1N1N1
Trans-vaginalN1N1N1N1N1
Trans-urethral
Trans-esoph. (non-Card.)
Musculo-skel.(Conventional)
Musculo-skel. (Superficial)
Intra-luminal
Other (Specify)
CardiacCardiac Adult
Cardiac Pediatric
Trans-esoph. (Cardiac)
Other (Specify)
PeripheralVesselPeripheral vessel
Other (Specify)

N'= new indication: predicate (ATL C9-5) cleared for this use with ATL HDI 3000 and ATL HDI 5000; a Includes Color M, Power (Ampl.) Doppler

6 + M; B+PWD; B+Color Doppler, B+PWD+Color Doppler.

(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of Center for Devices and Radiological Health, Office of Device Evaluation

Prescription Use (Per 21 CFR 801.109)

Nancy C. Brogdon

(Division Sigt Division of Reproduc and Radiological Devi 510(k) Numbe

{8}------------------------------------------------

System:ATL HDI 3000
Transducer:TC-CLA76-ATP
Intended Use: Diagnostic ultrasound imaging or fluid flow analysis of the human body as follows:
Clinical ApplicationMode of Operation
General(Track I Only)Specific(Tracks I & III)BMPWDCWDColorDoppleraCombinedModesbOther
OphthalmicOphthalmic
Fetal Imaging& OtherFetalN1N1N1N1N1
AbdominalN1N1N1N1N1
Intra-operative (Specify)
Intra-operative (Neuro)
Laparoscopic
Pediatric
Small Organ (Thyroid,Breast, Testes, etc.)
Neonatal Cephalic
Adult Cephalic
Trans-rectal
Trans-vaginal
Trans-urethral
Trans-esoph. (non-Card.)
Musculo-skel.(Conventional)
Musculo-skel. (Superficial)
Intra-luminal
Other (Specify)
CardiacCardiac Adult
Cardiac Pediatric
Trans-esoph. (Cardiac)
Other (Specify)
PeripheralVesselPeripheral vessel
Other (Specify)

N'= new indication: predicate (ATL C3.5R76) cleared for this use with ATL HDI 3000;

a Includes Color M, Power (Ampl.) Doppler

°B+M; B+PWD; B+Color Doppler, B+PWD+Color Doppler.

(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of Center for Devices and Radiological Health, Office of Device Evaluation

Prescription Use (Per 21 CFR 801.109)

Nancy hogdon
(Division Sign-Off)

Division of Reproduct ve. Abdon and Radiological Device 510(k) Number

{9}------------------------------------------------

ATL HDI 3000 and HDI 5000 Systems____ System:

Transducer:TC-L74-ATP Transucer. TO-L7+ATT
Intended Use: Diagnostic ultrasound imaging or fluid flow analysis of the human body as follows:

Clinical ApplicationMode of OperationOther
General(Track I Only)Specific(Tracks I & III)BMPWDCWDColorDoppleraCombinedModesb
OphthalmicOphthalmic
Fetal Imaging& OtherFetal
AbdominalN1N1N1N1N1
Intra-operativec (Specify)N1N1N1N1N1
Intra-operative (Neuro)
Laparoscopic
Pediatric
Small Organ (Thyroid,Breast, Testes, etc.)N1N1N1N1N1
Neonatal CephalicN1N1N1N1N1
Adult Cephalic
Trans-rectal
Trans-vaginal
Trans-urethral
Trans-esoph. (non-Card.)
Musculo-skel.(Conventional)N1N1N1N1N1
Musculo-skel. (Superficial)N1N1N1N1N1
Intra-luminal
Other (Specify)
CardiacCardiac AdultdN1N1N1N1N1
Cardiac PediatricdN1N1N1N1N1
Trans-esoph. (Cardiac)
Other (Specify)
PeripheralVesselPeripheral vesselN1N1N1N1N1
Other (Specify)

N = new indication: predicate (ATL L.7-4) cleared for this use with ATL HDI 3000 and ATL HDI 5000; a Includes Color M, Power (Ampl.) Doppler

6 +M; B+PWD; B+Color Doppler, B+PWD+Color Doppler.

°Intra-operative: abdominal, thoracic and PV.

Uncludes cardiac analysis

(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of Center for Devices and Radiological Health, Office of Device Evaluation

Prescription Use (Per 21 CFR 801.109)

Nancy C. Brogdon

(Division Sig Division of Reproductive, Abdon and Radiological Devic 510(k) Number

§ 892.1570 Diagnostic ultrasonic transducer.

(a)
Identification. A diagnostic ultrasonic transducer is a device made of a piezoelectric material that converts electrical signals into acoustic signals and acoustic signals into electrical signals and intended for use in diagnostic ultrasonic medical devices. Accessories of this generic type of device may include transmission media for acoustically coupling the transducer to the body surface, such as acoustic gel, paste, or a flexible fluid container.(b)
Classification. Class II.