Medtronic TONO-PEN XL Applanation Tonometer

Medtronic TONO-PEN XL Applanation Tonometer

The TONO-PEN XL is a handheld, portable applanation tonometer designed for measuring intraocular pressure (IOP) with high accuracy comparable to Goldmann tonometry. It was manufactured by Medtronic (under license from earlier producers like Mentor) and is now handled by Reichert Technologies, but specifications remain consistent across sources.

Features:

Type: Handheld applanation tonometer.

Measurement Principle: Micro strain gauge technology with a 1.0 mm diameter transducer tip.

Display: Easy-to-read LCD screen

Orientation: Functions in any position (ideal for patients in beds or wheelchairs).

Ease of Use: Lightweight ergonomic design; minimal training required; no anesthetic drops needed.

Clinical Correlation: IOP readings closely correlate with Goldmann tonometry; average of 4 independent readings with statistical confidence index for repeatability.

Portability: Fully portable; no setup time required.

Power: Battery-operated (includes batteries in starter kits; specific battery type not detailed in sources).

Weight: 2.1 oz (appx. 60 g).

Measurement Range and Accuracy:

IOP Range: 5–80 mmHg (inferred from standard tonometer capabilities; exact range confirmed in clinical use but not explicitly varied across sources)

Accuracy: High precision with statistical confidence indicator; less operator bias than traditional methods.

Calibration verification tools (device prompts for self-calibration on startup).