K990238 · Longport, Inc. · IYO · Jun 23, 1999 · Radiology
Device Facts
Record ID
K990238
Device Name
LONGPORT MODEL LDS -1
Applicant
Longport, Inc.
Product Code
IYO · Radiology
Decision Date
Jun 23, 1999
Decision
SESE
Submission Type
Traditional
Regulation
21 CFR 892.1560
Device Class
Class 2
Indications for Use
high resolution ultrasound imaging
Device Story
Longport LDS-1 is a portable, high-frequency (20 MHz) ultrasound scanner for non-invasive imaging of upper dermis layers. Device captures and reproduces soft tissue images up to 1.5 inches deep. System utilizes a laptop computer for processing and display. Operated by clinicians in a clinical setting. Input consists of ultrasonic echoes; output is high-resolution digital imagery (gray scale or color) displayed on a monitor. Healthcare providers use images to visualize skin structures, aiding in clinical assessment. Benefits include non-invasive diagnostic visualization of skin tissue.
Clinical Evidence
Bench testing only. No clinical data provided.
Technological Characteristics
Portable 20 MHz high-frequency ultrasound scanner. Single-element focused transducer; water reservoir with membrane stand-off. Pentium-based processor; Windows OS. Digital data format; hard/floppy disk storage. Connectivity via standard PC interfaces. Power: 100-200 V, 50-60 Hz. Safety standards: IEC 601-1, EN55011 Class A.
Indications for Use
Indicated for high resolution ultrasound imaging of the skin.
Regulatory Classification
Identification
An ultrasonic pulsed echo imaging system is a device intended to project a pulsed sound beam into body tissue to determine the depth or location of the tissue interfaces and to measure the duration of an acoustic pulse from the transmitter to the tissue interface and back to the receiver. This generic type of device may include signal analysis and display equipment, patient and equipment supports, component parts, and accessories.
Special Controls
*Classification.* Class II (special controls). A biopsy needle guide kit intended for use with an ultrasonic pulsed echo imaging system only is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 892.9.
Predicate Devices
DermaScan C ver. 3 (K89-4834)
Submission Summary (Full Text)
{0}------------------------------------------------
JUN 2 3 1999
### PREMARKET NOTIFICATION [510(K)] SUMMARY
- SRS International® Corporation 1. Submitted by: Suite 1000, 1625 K Street, NW Washington, D.C. 20006 Telephone: 202-223-0157 202-835-8970 Fax:
- 2. Contact Person: Michael G. Farrow, Ph.D.
#### 3. Name of the Device
- Longport™ Model LDSTM-1 a. Trade Name:
- b. Common Name: Ultrasound Scanner c. Classification Name: Class II 90 IYO
System, Imaging, Pulsed Echo, Ultrasonic
#### 4. Legally Marketed Device for which we are claiming substantial equivalence:
DermaScan C® ver. 3 Cortex Technology Textilvaenget 1 9560 Hadsund, Denmark Telephone 45-9857-4100 Fax 45-9857-2223
The USA Representative for DermaScan is: cyberDERM, inc. 275 New Darlington Road Media, PA 19063-5607 Telephone 610-544-7868
The 510(k) number for DermaScan is: K89-4834
#### 5. Description of the Device:
The Longport™ LDSTM-1 is a proprietary, non-invasive medical device for performing ultrasound scanning of the upper layers of the dermis. It is a portable, high frequency (20 MHz) ultrasound device which captures and reproduces images of soft tissue up to 1.5 inches below the skin at a high resolution utilizing a laptop computer.
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#### PAGE 2 of 2 K- 940-636
### 6. Intended Use of the Device: Current indication for use:
**high resolution ultrasound imaging"
### 7. Summary of Tcchnological Characteristics compared to Predicate Device:
Technological characteristics of this device which are similar to those of the predicate include:
- Transducer type: focused, single element a.
- Transducer stand-off medium: water b.
- Water reservoir retention: membrane c.
- d. Operating system: windows
- Operator control: keyboard/ mouse e.
- Processor: Pentium f.
- Data format: digital g.
- h. Data Storage: Hard/ floppy disk
- i. Distance Measurement
- Split Screen Features j.
- k. Palettes: Gray scale and color
Technological characteristics of this device which are different than the predicate include:
- Transducer Center Frequency: a. Longport 20MHz; Predicate 10, 20, 30 MHz
- b. Scan Rate: Longport 1 scan/ second: Predicate up to 6 scans/ second
- c. Safety: Longport: IEC 601-1 & EMI: EN55011, Class A Predicate: IEC 601 & UL 544
- d. Power Requirements Longport: 100-200 V, 50-60 Hz Predicate 110/220 VAC +/- 20%
- Power Consumption: e. Longport: 250 W Predicate 350 W
- Operating Temperature and Humidity: f. Longport 0-55ºC; 10-90% rel. non-condensing Predicate: 10-40ºC; 5-95% non-condensing
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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 features a staff with a snake winding around it, overlaid with three human figures. The text "DEPARTMENT OF HEALTH & HUMAN SERVICES USA" is arranged in a circular fashion around the symbol.
Food and Drug Administratic 9200 Corporate Boulevard Rockville MD 20850
JUN 2 3 1999
Longport, Inc. c/o Michael G. Farrow, Ph.D. Official Correspondent SRS International Corporation Suite 1000 1625 K Street, NW Washington, DC 20006-1604
RE: K990238 Longport Model LDS-1 (Ultrasound Skin Scanner) Regulatory Class: II Product Code: 90 IYO 21 CFR 892.1560 Dated: June 10, 1999 Received: June 10, 1999
Dear Dr. Farrow:
We have reviewed your Section 510(k) 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 Longport Model LDS-1, as described in your premarket notification:
> Transducer Model Number 20 MHz Transducer
If your device is classified (see above) into either class II (Special Controls) or class III (Premarket Approval) it may be subject to such Existing major regulations affecting your device can be additional controls. found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the Good Manufacturing Practice requirement, as set forth in the Quality System Regulation (QS) for Medical Devices: General (GMP) regulation (21 CFR Part 820) and that, through periodic QS inspections, the FDA will verify such Failure to comply with the GMP regulation may result in assumptions. regulatory action. In addition, the Food and Drug Administration (FDA) may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification does not affect any obligation you may have under sections 531 and 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.
{3}------------------------------------------------
Page -2- Dr. Farrow
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 and additionally 809.10 for in vitro diagnostic devices), 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 Other general information on your responsibilities under the Act may 807.97). be obtained from the Division of Small Manufacturers Assistance at its tollfree number (800) 638-2041 or at (301) 443-6597 or at its internet address "http://www.fda.gov/cdrh/dsmamain.html".
If you have any questions regarding the content of this letter, please contact Paul M. Gammell, Ph.D. at (301) 594-1212.
Sincerely yours,
Harriet C. Ingram
Daniel G. Schultz, M.D. Acting Director, Division of Reproductive, Abdominal, Ear, Nose and Throat, and Radiological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure (s)
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Page_1___of_1__
510(k) Number (if known): _K-99-0238
Device Name:_Longport_Model_LDS=1_____________________________________________________________________________________________________________________________________________
Indications For Use:
high resolution ultrasound imaging
(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
| (Division Sign-Off) | |
|--------------------------------------------------------------------|---------|
| Division of Reproductive, Abdominal, ENT, and Radiological Devices | |
| 510(k) Number | K990238 |
| Prescription Use | <div> <img alt="checkbox" src=""/> </div> | OR | Over-The-Counter Use | <div> <img alt="checkbox" src=""/> </div> |
|----------------------|-------------------------------------------|----|----------------------|-------------------------------------------|
| (Per 21 CFR 801.109) | | | | |
(Optional Format 1-2-96)
{5}------------------------------------------------
### (990238
## LDS-1 Ultrasound System
. Appendix F
#### Diagnostic Ultrasound Indications for Use Form
Fill out one form for each ultrasound system and each transducer.
Intended Use: Diagnostic ultrasound imaging or fluid flow analysis of the human body as follows:
| | <b>Mode of Operation</b> | | | | | | | | | |
|-------------------------------|--------------------------|----------|----------|------------|------------|----------------------|--------------------------|-------------------------------|---------------------------|------------------------|
| <b>Clinical Application</b> | <b>A</b> | <b>B</b> | <b>M</b> | <b>PWD</b> | <b>CWD</b> | <b>Color Doppler</b> | <b>Amplitude Doppler</b> | <b>Color Velocity Imaging</b> | <b>Combined (specify)</b> | <b>Other (specify)</b> |
| Ophthalmic | | | | | | | | | | |
| Fetal | | | | | | | | | | |
| Abdominal | | | | | | | | | | |
| Intraoperative (specify) | | | | | | | | | | |
| Intraoperative Neurological | | | | | | | | | | |
| Pediatric | | | | | | | | | | |
| Small Organ (specify) | | | | | | | | | | |
| Neonatal Cephalic | | | | | | | | | | |
| Adult Cephalic | | | | | | | | | | |
| Cardiac | | | | | | | | | | |
| Transesophageal | | | | | | | | | | |
| Transrectal | | | | | | | | | | |
| Transvaginal | | | | | | | | | | |
| Transurethral | | | | | | | | | | |
| Intravascular | | | | | | | | | | |
| Peripheral Vascular | | | | | | | | | | |
| Laparoscopic | | | | | | | | | | |
| Musculo-skeletal Conventional | | | | | | | | | | |
| Musculo-skeletal Superficial | | | | | | | | | | |
| Other (specify) | SKIN | N | | | | | | | | |
N= new indication; P= previously cleared by FDA; E= added under Appendix E
Additional Comments: Track 1
(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
David G. Legon
(Division Sign-Off)
Division of Reproductive, Abdominal, ENT, and Radiological Devices
Prescription Use (Per 21 CFR 801.109)
F-3
510(k) Number
{6}------------------------------------------------
### K990238
# 20 MHz Transducer for use with the LDS-1 Ultrasound System Appendix F
### Diagnostic Ultrasound Indications for Use Form
Fill out one form for each ultrasound system and each transducer.
Intended Use: Diagnostic ultrasound imaging or fluid flow analysis of the human body as follows:
| Clinical Application | Mode of Operation | | | | | | | | | |
|-------------------------------|-------------------|---|---|-----|-----|---------------|-------------------|------------------------|--------------------|-----------------|
| | A | B | M | PWD | CWD | Color Doppler | Amplitude Doppler | Color Velocity Imaging | Combined (specify) | Other (specify) |
| Ophthalmic | | | | | | | | | | |
| Fetal | | | | | | | | | | |
| Abdominal | | | | | • | | | | | |
| Intraoperative (specify) | | | | | | | | | | |
| Intraoperative Neurological | | | | | | | | | | |
| Pediatric | | | | • | | | | | | |
| Small Organ (specify) | | | | | | | | | | |
| Neonatal Cephalic | | | | | | | | | | |
| Adult Cephalic | | | | | | | | | | |
| Cardiac | | | | | | | | | | |
| Transesophageal | | | | | | | | | | |
| Transrectal | | | | | | | | | | |
| Transvaginal | | | | | | | | | | |
| Transurethral | | | | | | | | | | |
| Intravascular | | | | | | | | | | |
| Peripheral Vascular | | | | | | | | | | |
| Laparoscopic | | | | | | | | | | |
| Musculo-skeletal Conventional | | | | | | | | | | |
| Musculo-skeletal Superficial | | | | | | | | | | |
| Other (specify) SKIN | | N | | | | | | | | |
N= new indication; P= previously cleared by FDA; E= added under Appendix E
Additional Comments: Track 1
(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH; Office of Device Evaluation (ODE)
(Division Sign-Off)
Division of Reproductive, Abdominal, ENT, and Radiological Devices
Prescription Use (Per 21 CFR 801.109)
Prescription Use (Per 21 CFR 801.109)
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F-3
510(k) Number K990238
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Scroll right in the results table. The intended use is extracted for you — no need to open the PDF. The device story gives a high-level snapshot of what the device does and how it's used. The AI Performance sub-table shows each output name, acceptance criteria, observed values, and development/test dataset descriptions — the same format Innolitics uses for regulatory strategy outputs, and the fastest high-level fingerprint of an AI device. It is AI-generated but has been very reliable in practice.
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Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
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Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
3. Judging fuzzy relevance
Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
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Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
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Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
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Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.