The Nidek Model NT-4000 non-contact tonometer optically detects the momentary state of the cornea (applanated by air pressure) and measures intraocular pressure without touching the cornea.

The Model NT-4000 is comprised of main unit and a measuring unit that are provided on a base unit. Each unit contains the following components:

MAIN UNIT: A screen, control panel, and joystick are provided on this unit. .
MEASURING UNIT: The air nozzle and photo-detector are provided on this unit. .
BASE UNIT: The chinrest and a printer are provided on this unit. .

The Model NT-4000 has the following features:

1. Auto Alignment Mode: When the measuring unit approaches the center of the pupil in this mode, the instrument automatically performs alignment in the up, down, left, and right directions, and focuses in the back and forth directions. The measurement then starts automatically.
1. Automatic Puff Control (APC) Function: The intraocular pressure measurement can be performed with the air pressure as low as possible. When the measurement range is set to "APC 40" or "APC 60", in the first measurement, the automatic shut-off function (which is to stop puffing air as soon as the light reflected from the cornea is detected) activates in order to eliminate excessive puffing. In the subsequent measurement, the APC function activates to perform the measurement with the minimum air pressure based on the former measurement data. As the patient's eye is protected from excessive air pressure, the patient's comfort level increases and continuous measurement can be performed smoothly.
1. Pulse Synchronized Intraocular Pressure Measurement: In addition to the standard IOP measurement mode, the intraocular pressure measurement can be performed in synchronization with an arbitrary position of the pulse signal that is obtained by the detector in the forehead rest. When the signals of the pulse and the completion of the alignment are detected simultaneously, the pulse synchronized IOP measurement is executed. It is possible to select the point of a pulse (i.e., either peak, middle, or bottom) to which measurement will be synchronized.

AI/ML Overview

The provided document describes the Nidek Non-Contact Tonometer Model NT-4000 and its substantial equivalence to a predicate device. However, it does not contain the detailed performance study information requested.

The document focuses on:

Device Description: What the NT-4000 is and its features.
Intended Use: Measurement of intraocular pressure.
Technological Characteristics Comparison: A table comparing the NT-4000 to its predicate (NT-1000) highlighting similar functions and minor differences.
Performance Data (General): States that the device was tested against specific electrical safety, electromagnetic compatibility, and ophthalmic instrument standards (EN 60601-1, EN 60601-1-2, EN 60601-1-4, ISO 15004, JIS T7312) and "was found to meet all requirements."
Conclusion: The device is equivalent to the predicate in intended use, technological characteristics, safety, and effectiveness.
FDA Clearance Letter: Confirmation of 510(k) clearance based on substantial equivalence.

Therefore, I cannot populate most of the requested fields because the necessary detailed information about acceptance criteria, study design, sample sizes, ground truth establishment, or expert involvement is not present in the provided text.

Here's what can be extracted and what cannot:

A table of acceptance criteria and the reported device performance

Acceptance Criteria (Explicitly Stated in Document)	Reported Device Performance (As stated in Document)
Compliance with EN 60601-1 (Electrical Safety)	"was found to meet all requirements of both standards."
Compliance with EN 60601-1-2 (Electromagnetic Compatibility)	"was found to meet all requirements of both standards."
Compliance with EN 60601-1-4 (Programmable Electrical Medical Systems)	"was found to meet all requirements of the standard."
Compliance with ISO 15004 (Test Requirements and Test Methods for Ophthalmic Instruments)	"was found to meet all requirements of the standards."
Compliance with JIS T7312 (Test Requirements and Test Methods for Ophthalmic Instruments - Japan)	"was found to meet all requirements of the standards."
Substantial equivalence to predicate device (Nidek Model NT-1000)	"demonstrated through its evaluation...that the device is equivalent to the predicate device with respect to intended use, technological characteristics, and safety and effectiveness."

Sample sizes used for the test set and the data provenance (e.g. country of origin of the data, retrospective or prospective)
- Information Not Provided. The document only mentions general compliance with standards, not specific clinical or performance test data on a patient/sample cohort.
Number of experts used to establish the ground truth for the test set and the qualifications of those experts (e.g. radiologist with 10 years of experience)
- Information Not Provided. No mention of experts for ground truth establishment.
Adjudication method (e.g. 2+1, 3+1, none) for the test set
- Information Not Provided. No details on any specific test set or adjudication.
If a multi reader multi case (MRMC) comparative effectiveness study was done, If so, what was the effect size of how much human readers improve with AI vs without AI assistance
- Information Not Provided. This device is a non-contact tonometer for measuring IOP, not an AI-assisted diagnostic imaging device that would typically involve human readers.
If a standalone (i.e. algorithm only without human-in-the loop performance) was done
- Information Not Provided. The device is a measurement instrument, not an algorithm in the sense of AI or software-only evaluation. Its "standalone" performance is implied by its ability to measure IOP.
The type of ground truth used (expert consensus, pathology, outcomes data, etc)
- Information Not Provided. For a tonometer, "ground truth" would ideally be a gold standard IOP measurement device (e.g., Goldmann applanation tonometer). This is not specified, but the device's accuracy is likely compared against such a standard during its development or validation as implied by "meets all requirements of the standards."
The sample size for the training set
- Information Not Provided. Not applicable for this type of device, which relies on physical measurement principles rather than machine learning training sets.
How the ground truth for the training set was established
- Information Not Provided. Not applicable for this type of device.

Summary

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510(k) SUMMARY Nidek Non-Contact Tonometer Model NT-4000

SUBMITTER INFORMATION 1.

A.	Company Name:	Nidek Incorporated
B.	Company Address:	47651 Westinghouse Drive.Fremont, CA 94539-7474
C.	Company Phone:Company Fax:	(510) 353-7719(510) 226-5750
D.	Contact Person:	Mr. Hiroshi OkadaRegulatory and QA ManagerNidek Incorporated
E.	Date Summary Prepared:	May 16, 2003

DEVICE IDENTIFICATION 2.

A.	Classification Name:	Tonometer, AC-Powered
B.	Trade/Proprietary Name:	Nidek Non-Contact Tonometer Model NT-4000
C.	Device Classification:	Class II (per 21 CFR 886.1930)
D.	Product Code:	HKX

3. SUBSTANTIAL EQUIVALENCE

The Nidek Model NT-4000 is of comparable type and is substantially equivalent to the following predicate device:

Predicate Device	Manufacturer	510(k) No.	Date Cleared
Model NT-1000 Non-Contact Tonometer	Nidek Co. Ltd.	K913189	October 15,1991

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DEVICE DESCRIPTION 4.

The Nidek Model NT-4000 non-contact tonometer optically detects the momentary state of the cornea (applanated by air pressure) and measures intraocular pressure without touching the cornea.

The Model NT-4000 is comprised of main unit and a measuring unit that are provided on a base unit. Each unit contains the following components:

MAIN UNIT: A screen, control panel, and joystick are provided on this unit. .
MEASURING UNIT: The air nozzle and photo-detector are provided on this unit. .
BASE UNIT: The chinrest and a printer are provided on this unit. .

The Model NT-4000 has the following features:

1. Auto Alignment Mode: When the measuring unit approaches the center of the pupil in this mode, the instrument automatically performs alignment in the up, down, left, and right directions, and focuses in the back and forth directions. The measurement then starts automatically.
1. Automatic Puff Control (APC) Function: The intraocular pressure measurement can be performed with the air pressure as low as possible. When the measurement range is set to "APC 40" or "APC 60", in the first measurement, the automatic shut-off function (which is to stop puffing air as soon as the light reflected from the cornea is detected) activates in order to eliminate excessive puffing. In the subsequent measurement, the APC function activates to perform the measurement with the minimum air pressure based on the former measurement data. As the patient's eye is protected from excessive air pressure, the patient's comfort level increases and continuous measurement can be performed smoothly.

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1. Pulse Synchronized Intraocular Pressure Measurement: In addition to the standard IOP measurement mode, the intraocular pressure measurement can be performed in synchronization with an arbitrary position of the pulse signal that is obtained by the detector in the forehead rest. When the signals of the pulse and the completion of the alignment are detected simultaneously, the pulse synchronized IOP measurement is executed. It is possible to select the point of a pulse (i.e., either peak, middle, or bottom) to which measurement will be synchronized.

5. INTENDED USE

The Nidek Model NT-4000 is a non-contact tonometer that is intended for use in the measurement of intraocular pressure of the human eye.

TECHNOLOGICAL CHARACTERISTICS 6.

A comparison of the technological characteristics of the Nidek Non-Contact Tonometer Model NT-4000 and the predicate device has been performed, and the results are summarized in the table below. The results of this comparison demonstrate that the Nidek Non-Contact Tonometer Model NT-4000 has the same basic technological characteristics as the predicate device and is equivalent to the marketed predicate device. The differences between the Nidek Non-Contact Tonometer Model NT-4000 and the predicate device are insignificant and do not affect the safety or effectiveness of the device.

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PREDICATE DEVICE COMPARISON TABLE		Nidek Model NT-1000
		K913189
Specifications &Characteristics
Manufacturer	Nidek Co. Ltd.Japan	Nidek Co. Ltd.Japan
Device Name	Non-Contact Tonometer ModelNT-4000	Non-Contact TonometerModel NT-1000
Indications For Use	The Nidek Model NT-4000 is anon-contact tonometer that isindicated for use in themeasurement of intraocularpressure of the human eye.	NT-1000 allows one tomeasure the intraocularpressure by blowing air on thecornea without touchingdirectly to the patient's eye.
MEASUREMENT
Measurement Range	1 to 60 mmHg	1 to 60 mmHg
Measurement RangeSetting	APC40APC604060	APC30APC603060
Working Distance	11 mm	11 mm
Automatic Puff Control(APC) Feature	Yes	Yes
Pulse SynchronizedIOP MeasurementFunction	Yes	No
Eyelid DetectionFunction	Yes	No
PREDICATE DEVICE COMPARISON TABLE
	Nidek Model NT-4000	Nidek Model NT-1000K913189
ALIGNMENT
Alignment Method	1 alignment spot & focusingindicator	1 alignment spot & focusingindicator
Inner Fixation Light	Green LED	Green LED
Automatic MovementSystem	Yes:Horizontal & verticaldirections; back & forthdirections; Pulse Synchronoussystem (selection)	No; manual operation only
Alignment Mode	• F.AUTO: auto alignment,auto focus, auto air puff).• S.AUTO: auto alignment,manual focus, auto air puff).• MANUAL: manualalignment, manual focus,auto air puff).	• AUTO: auto alignment,manual focus, auto airpuff.• MANUAL: manualalignment, manual focus,auto air puff.
Operation Range byJoystick	36 mm back & forth; 86 mmright & left; 28 mm up & down	36 mm back & forth; 86 mmright & left; 28 mm up &down
DISPLAY / PRINTING
Screen	5 inch TFT color display	5 inch black & white display
Printer	Thermal line printer	Built-in thermal printer
POWER SPECIFICATIONS
Voltage	AC 100 / 120 / 230 V	AC 100 / 120 / 220 / 240 V
Frequencies	50 / 60 Hz	50 / 60 Hz
Power Consumption	70VA maximum	80VA maximum
DIMENSIONS & WEIGHT
Dimensions (W x D xH) & Weight	260 mm (W) x 487 mm (D) x457 mm (H); approx. 17 kg	260 mm (W) x 487 mm (D) x440 mm (H); approx. 20 kg

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7. PERFORMANCE DATA

The following testing was performed on the Nidek Non-Contact Tonometer Model NT-4000 to demonstrate that it meets all specified requirements and is equivalent to the predicate device:

Electrical Safety Testing & Electromagnetic Compatibility A.

The Nidek Non-Contact Tonometer Model NT-4000 was tested in accordance with EN 60601-1 and EN 60601-1-2, and was found to meet all requirements of both standards.

Programmable Electrical Medical Systems B.
The Nidek Non-Contact Tonometer Model NT-4000 was tested in accordance with EN 60601-1-4 and was found to meet all requirements of the standard.

C. Test Requirements and Test Methods for Ophthalmic Instruments

The Nidek Non-Contact Tonometer Model NT-4000 was tested in accordance with ISO 15004 and JIS T7312 and was found to meet all requirements of the standards.

CONCLUSIONS 8.

. .

Nidek Incorporated has demonstrated through its evaluation of the Nidek Non-Contact Tonometer Model NT-4000 that the device is equivalent to the predicate device with respect to intended use, technological characteristics, and safety and effectiveness.

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Image /page/6/Picture/1 description: The image shows the logo for the U.S. Department of Health and Human Services. The logo is circular in shape, with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" arranged around the perimeter of the circle. In the center of the circle is an abstract symbol that resembles a stylized caduceus, a symbol often associated with medicine and healthcare.

DEC - 4 2003

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

Nidek Incorporated c/o Ms. Carol L. Patterson Patterson Consulting Group, Inc. 21911 Erie Lane Lake Forest, CA 92630

Re: K031733

Trade/Device Name: Tonometer, AC-Powered Regulation Number: 21 CFR 886.1930 Regulatory Class: Class II Product Code: HKX Dated: June 3, 2003 Received: June 9, 2003

Dear Ms. Patterson:

We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and 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) that do not require approval of a premarket approval application (PMA). 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.

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.

Please be advised 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.

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Page 2 - Ms. Carol L. Patterson

This letter will allow you to begin marketing your device as described in your Section 510(k) 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 the 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) 594-4613. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its Internet address http://www.fda.gov/cdrh/dsma/dsmamain.html

Sincerely vours.

Akeri Rosenthal

A. Ralph Rosenthal, M.D. Director Division of Ophthalmic and Ear, Nose and Throat Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

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INDICATIONS FOR USE

KO31733 3 __ (To Be Assigned By FDA) 510(k) Number: Device Trade Name: Nidek Non-Contact Tonometer Model NT-4000 Indications For Use: The Nidek Model NT-4000 is a non-contact tonometer that is indicated for use in the measurement of intraocular pressure of the human eye.

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

Concurrence of CDRH, Office of Device Evaluation (ODE)

Prescription Use V (Per 21 CFR 801.109)

Over-The-Counter Use

Denis L. McCarthy

Division of Ophthalmic Ear. Nose and Throat Devises

510(k) Number K031733

Regulation Number and Section

§ 886.1930 Tonometer and accessories.

(a)
Identification. A tonometer and accessories is a manual device intended to measure intraocular pressure by applying a known force on the globe of the eye and measuring the amount of indentation produced (Schiotz type) or to measure intraocular tension by applanation (applying a small flat disk to the cornea). Accessories for the device may include a tonometer calibrator or a tonograph recording system. The device is intended for use in the diagnosis of glaucoma.(b)
Classification. Class II.