Heart rate logger implantable in animals

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DST milli-HRT heart rate and temperature logger

Implantable heart rate sensor for animal research


Key features

  • Leadless, minimally invasive
  • Size 13mm x 39.5mm and 11.8g
  • Long battery life
  • Automatic stress-free measurements
  • ECG derived heart rate, data verification


The heart rate logger DST milli-HRT simultaneously measures long term heart rate and core temperature in the animal. This makes it ideal for studies in which baseline and immunology responses are recorded. The logger is also suitable for toxicological, metabolic and thermoregulation studies. The heart rate is derived from a leadless single channel ECG (electrocardiogram) in which the electrodes are part of the housing material, making the logger especially easy to implant. For heart rate the logger takes a burst measurement on any set time interval and calculates the mean heart rate for each recording. Each recorded burst measurement consists of 600 measurements. For validation purposes, each individual burst is graded with a certain QI (quality index) accessible in the accompanying application software.

The heart beat logger can store up to 699000 heart rate and temperature measurements and has a battery life of 8.5 months (with sampling interval of 10 min). DST milli-HRT can be easily sterilized and reused as long as the batteries last. Each DST milli-HRT has its own five digit serial number permanently marked on the logger housing as well as placed in the logger's memory and provided with all downloaded data. DST milli-HRT is especially useful when a comprehensive data set throughout the research with no disturbance to the animal is needed. Each logger comes with a calibration certificate.

The DST milli-HRT is supported by the Mercury software and the Communication Box which serves as an interface between the logger and a PC computer. Communication between the logger and the Communication Box is wireless when logger is placed in the Communication Box.

In the software, the user programs the start time, start date and sampling interval before the logger is implanted/deployed. Fastest sampling interval is 1 minute. Optionally the loggers can be programmed with up to seven different intervals within a measurement sequence. The user defines the number of measurements for each of the interval so it's possible to have more/less frequent measurements during specific periods.
                                               Temperature and heart rate correlation

After recovering the DST, recorded data is uploaded in the software where the results are displayed both in graphic and tabular form. The software also provides the user with some basic statistic information on the data such as minimum and maximum values on defined area, median, average, distribution of values etc. When recorded data has been retrieved, the DST can be re-programmed and reused as long as the batteries last.

A set of Communication Box and Mercury software needs to be purchased with the first order.

For more information about accessories please see our Accessories site.

Examples of Application

Suitable for studies within:

  • Laboratory animal science
  • Animal welfare
  • Fish physiology

Technical Specifications

SensorsTemperature and heart rate
Size (diameter x length)13mm x 39.5mm
Housing materialAlumina (Ceramic)
Weight (in air/in water)11.8g
Memory typeNon-volatile EEPROM or FLASH
Memory capacity699,051 measurements per sensor
Data resolution12 bits
Temperature resolution0.032°c (0.058°F)
Temperature accuracy+/- 0.2°C (0.36°F)
Temperature range5°C to 45°C (41°F to 113°F)
Data retention25 Years
ClockReal time clock
Accuracy +/-1 min/month
Sampling intervalIn second(s), minute(s), or hour(s)
Number of different sampling intervals-Single interval throughout measuring period
-Or multiple intervals throughout period
CommunicationsCommunication Box, wirelss transmission when DST sits in the box. Connection: USB cable
Attachment hole0.9 mm (in diameter)
Battery life8.5 months*
*For a sampling interval of 10 min. Battery is non-replaceable. Specifications are subject to change without notice.

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