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Design of a new EEG monitoring TCI syringe pump based on M3352 industrial control core board
**1.1 Background Event**
In surgical operations where anesthesia is administered, excessive doses of anesthetics can lead to serious complications, including cardiac and respiratory arrest, potentially causing irreversible brain damage. Traditionally, anesthesiologists relied solely on their experience to manage the administration of anesthetics. However, the advent of EEG monitoring combined with Target Controlled Infusion (TCI) pumps has revolutionized this process. By integrating Brain Electroencephalogram (BIS) monitoring with TCI technology, these devices provide a personalized approach to sedation, significantly reducing the risks associated with anesthesia.
**1.2 EEG Monitoring TCI Syringe Pump Control Board Function Requirements**
The EEG monitoring TCI syringe pump builds upon conventional syringe pump functionality by incorporating real-time EEG data from an EEG analyzer. This integration allows for precise control over injection volumes and speeds, ensuring a more scientific and safer sedation process. The pump requires a robust control board capable of interfacing with external sensors and managing intricate operational tasks.
**Control Board Functional Requirements:**
- **Display Interface:** A 7-inch or larger color LCD screen with touch capabilities for intuitive interaction.
- **RS-232 Interface:** To connect with the EEG analyzer for real-time data exchange.
- **PWM Output:** Controls the injection motor's speed and direction.
- **ADC Input:** Collects position data from the injection tubing.
- **Sound Card:** Provides auditory feedback during the injection process.
- **Ethernet Connectivity:** Facilitates data upload to a server for further analysis.
**1.3 Challenges in EEG Monitoring TCI Syringe Pump Control Board Design**
Despite its potential benefits, developing such a device presents several challenges:
1. **Touchscreen “Flying Points†and Frequent Errors**
- The four-wire resistive touchscreen often exhibits “flying points,†leading to unintended interactions and a poor user experience. These anomalies are visible as erratic lines and spikes in the touchscreen’s operation graph.
2. **Slow Response Time and System Crashes**
- The complex software architecture and numerous tasks running simultaneously result in sluggish touch responses and occasional system crashes, requiring device restarts. This issue is particularly problematic during critical operations.
3. **Power Failures Leading to Device Malfunctions**
- During power-off scenarios, especially with frequent switching, the device sometimes fails to reboot properly due to corrupted or lost operating system files stored in flash memory. This sporadic malfunction has been observed across all early prototypes, severely impacting product reliability.
**1.4 Our Recommendations**
To address these challenges, ZLG Zhiyuan Electronics proposes utilizing the M3352 industrial control core board to accelerate product development. This solution offers a comprehensive approach to overcoming the design hurdles encountered.
**Key Features and Solutions:**
1. **Improved Touchscreen Accuracy**
- Hardware filtering circuits, specifically low-pass filters, were incorporated into the touchscreen interface circuit to mitigate interference. Capacitors C78-C81 should be selected carefully, ideally at 1nF, to ensure smooth touch responses without delays. Additionally, the touchscreen driver was enhanced with algorithms to eliminate “flying points,†resulting in smoother and more accurate touch interactions.
2. **Enhanced Processor Performance**
- The M3352 core board employs a Cortex-A8 processor with a clock speed of up to 800 MHz, providing superior performance compared to traditional ARM9 processors. This ensures faster processing speeds and reduces the likelihood of system crashes during intensive operations.
3. **Reliable File System Management**
- Extensive testing under power failure conditions confirmed the robustness of the M3352’s file system. After 100,000 power cycles, the file system remained intact, preventing data loss and ensuring seamless device operation even after unexpected shutdowns.
**1.5 Recommended Products**
The M3352 core board stands out with its advanced design and reliability:
- **Static and Surge Protection:** Meets industry standards for electromagnetic compatibility.
- **Processor:** TI Cortex-A8 AM3352, 800 MHz clock speed.
- **Operating Systems:** Supports both Windows CE and embedded Linux.
- **Interfaces:** Six UART ports, two CAN interfaces, dual USB OTG, dual Ethernet.
- **Physical Dimensions:** 60mm x 45mm.
- **Temperature Range:** Operates between -40°C and +85°C.
This versatile and robust solution addresses the complexities of designing a state-of-the-art EEG monitoring TCI syringe pump, offering unparalleled precision and safety in medical applications.