Nexisense Medical Sensor Solutions: Non-Contact Temperature, Oxygen Flow/Concentration, Gas Pressure, and EtCO₂ Integration

Healthcare Sensor Application Scenarios

In modern medical equipment, sensors are core elements that directly affect precision, responsiveness, and safety of life-support systems. Nexisense series provide reliable physiological parameter acquisition, widely applied in:

• Non-contact body temperature screening and continuous monitoring (e.g., forehead/ear modules, infrared thermometers in isolation wards)

• Oxygen flow/concentration and pressure control in respiratory support equipment (ventilators, anesthesia machines, HFNC, oxygen concentrators)

• Gas pressure monitoring (electronic blood pressure monitors, respiratory circuit pressure, hemodynamic monitoring)

• End-tidal gas analysis (EtCO₂ capnography, used for mechanical ventilation, anesthesia depth assessment, COPD/asthma monitoring)

These applications comply with IEC 60601-1, ISO 80601-2-12, and other medical standards, emphasizing low latency, interference resistance, biocompatibility, and long-term stability. They support embedded integration and multi-parameter fusion.

Selection Guide: Key Product Parameters and Matching Principles

Selection depends on device type, measurement range, accuracy, interface protocol, and certification requirements.

Non-Contact Infrared Temperature Sensor (Thermopile):

• Range: -40~150℃ (human mode 35~42℃)

• Accuracy: ±0.2℃ (medical-grade calibration)

• Response Time: <150 ms

• Output: I2C/SMBus or UART

• Protection: IP54, environmental interference compensation

Suitable for forehead thermometers, continuous monitoring patches, or isolation screening devices, prioritizing medical-grade thermopiles for clinical accuracy.

Oxygen Flow and Concentration Sensor (Thermal/Ultrasonic/Electrochemical):

• Flow range: 0~300 L/min

• Concentration range: 21~100% O₂

• Accuracy: Flow ±(2% reading +0.5 L/min), Concentration ±1.5% vol

• Response Time: <200 ms

• Output: UART/RS485/CAN

For monitoring inhalation and exhalation in ventilators and oxygen concentrators, with temperature/pressure compensation.

Gas Pressure Sensor (MEMS Piezoresistive):

• Range: -100~300 cmH₂O (respiratory circuit) or 0~300 mmHg (blood pressure)

• Accuracy: ±0.5% FS

• Overpressure protection: >3× FS

• Output: Analog voltage or digital I2C

Applicable for airway pressure in ventilators, electronic blood pressure monitors, and anesthesia gas pressure control.

End-Tidal CO₂ Sensor (NDIR Main/Side-Stream):

• Range: 0~150 mmHg EtCO₂

• Accuracy: ±2 mmHg (0~40 mmHg)

• Response Time: <10 ms

• Output: RS232/UART

• Sampling: Main-stream (airway adapter) or side-stream (sampling tube)

For capnography modules, supporting waveform output and respiratory rate calculation.

Integration Considerations and Compatibility Assurance

• Communication: Standard I2C/UART for MCU or embedded Linux; RS485/CAN for multi-node monitor networks.

• Installation & Sampling: IR sensor facing forehead/ear; flow/pressure sensors at critical points with condensation filters; EtCO₂ main-stream connected directly to airway, side-stream with clog protection.

• Power & EMC: DC 3.3/5 V, low-power, built-in isolation and TVS, compliant with IEC 60601-1-2.

• Calibration & Diagnostics: Factory pre-calibration, field zero/span adjustments; self-test and UDS protocol (ISO 14229).

• Multi-Parameter Fusion: Combine SpO₂, EtCO₂, airway pressure, and O₂ concentration for closed-loop ventilator control and patient assessment, supporting cloud-based remote monitoring.

Modules can be quickly integrated via SDK into existing monitors or ventilator firmware.

Application Cases

• Ventilator upgrade in a tertiary hospital: oxygen flow/concentration and EtCO₂ sensors integrated, precise FiO₂ control, capnography waveform display, ventilation error <3%.

• Isolation ward screening system during pandemic: non-contact IR modules at entrance thermography and bedside monitoring, with cloud fever alerts, reducing cross-infection risk.

• Anesthesia gas monitoring retrofit: pressure and oxygen sensors embedded in multiple anesthesia workstations, supporting low-flow anesthesia <300 mL/min, reducing gas consumption ~20%.

• Hyperbaric oxygen chamber safety monitoring: pressure and O₂ sensors for real-time monitoring, overpressure/hypoxia interlock, compliant with GB 12130.

These cases demonstrate long-term stability and clinical suitability in high humidity, high oxygen, and EMI environments.

OEM Customization and Mass Supply Advantages

• Customizable range, accuracy, interface, housing, and biocompatible coatings

• Complete SDK, reference designs, and functional safety documentation (IEC 62304)

• Mass production verified for consistency and environmental reliability (high temp/humidity, vibration, drop)

• Stable supply chain and annual framework agreements, aligned with new device registration and production

Suitable for manufacturers of ventilators, anesthesia machines, patient monitors, and oxygen devices.

FAQ

• How to maintain ±0.2℃ accuracy in IR thermometers in isolation rooms with temperature changes? Built-in environmental compensation and secondary thermopile calibration, periodic verification with blackbody recommended.

• Does oxygen flow sensor meet response time in low-flow HFNC <1 L/min? Thermal/ultrasonic T90 <200 ms, with temp/pressure compensation, clinically validated for neonates and adults.

• Zero drift control for gas pressure sensors in circuits with condensation? MEMS with hydrophobic coating and temp compensation, drift <±0.5% FS/year, field zero calibration every 6 months.

• Main-stream vs side-stream EtCO₂ pros/cons? Main: faster response, no sampling delay, higher dead space; side: non-intubated, needs anti-clog protection. Nexisense offers both SDKs.

• Handling I2C/UART bus conflicts with multiple sensors? Supports address assignment and polling, CAN bus recommended for high-load nodes; DBC and protocol stack reference provided.

• Does the product support medical device registration and FDA/CE? Yes, core components ISO 13485, material list, biocompatibility, and EMC test data available, supports NMPA registration.

• Post-purchase calibration and support? Batch calibration service, CNAS traceable reports, sufficient spare parts, urgent replacement within 72 h.

• How to evaluate TCO for sensors in medical devices? Considers purchase, calibration frequency, MTTF >8 years, replacement rate; typical TCO 20~30% lower than imported alternatives.

Conclusion

Nexisense provides high-performance medical sensors and integration solutions for ventilators, anesthesia machines, patient monitors, and oxygen devices. Contact us for prototype testing, technical discussions, or customized quotes to enhance monitoring accuracy and patient safety.