Key Point One: Imaging technology and clarity
This is the core indicator, which directly determines the practical effect of the equipment.
Core technologies: Currently, there are mainly two mainstream technologies, namely infrared imaging and ultrasonic imaging. Infrared light equipment is non-contact and forms images based on the differences in the absorption of near-infrared light by hemoglobin in blood vessels. Ultrasound, on the other hand, directly observes the structure of blood vessels and blood flow through sound waves.
Image quality: Focus on the resolution, contrast and depth of the imaging. High-quality imaging devices can present clear vascular images that contrast sharply with the surrounding tissues on patients of different skin colors and body weights. Especially for deep and tiny blood vessels, whether they can be clearly displayed is the key.
Real-time performance: The image should have no delay and be able to follow the movement of the probe in real time, which is crucial for the dynamic puncture process.

Key Point Two: Patient adaptability and safety
The equipment must be capable of serving a wide range of patient groups and be absolutely safe.
Skin color adaptability: Excellent equipment should have the ability to overcome "skin color bias", effectively imaging both fair and dark skin. Find out if the device has special calibrations or modes for different skin tones.
Body type adaptability: For patients with obesity, edema or emaciation, whether the penetration ability and imaging effect of the equipment are stable.
Safety level: Confirm that the light source energy of the equipment is within the absolutely safe range of non-ionizing radiation and has obtained the relevant medical device registration certification.

Point Three: Ease of use and workflow integration
The equipment needs to be integrated into the existing clinical process rather than adding to the burden.
Ease of operation: Can the device be used immediately upon startup? Is the calibration process complicated? Is the interface intuitive? Ideally, nurses or doctors should be able to get started after a brief training.
Portability and Design: Is the device Handheld or desktop? How is the battery life? Whether it is lightweight and ergonomically designed, making it convenient to move and use between wards, emergency rooms and operating rooms.
Sterility and disinfection: Are the parts that come into contact with patients easy to clean and disinfect? Are disposable sterile protective covers provided? This is directly related to infection control.

Key Point Four: Functionality and Augmented Reality Experience
Advanced functions can significantly enhance clinical value.
AR augmented reality projection: Many modern venous imaging devices can directly project vascular images onto the patient's skin, achieving "what you see is what you get", allowing the operator not to switch their line of sight back and forth between the screen and the skin, greatly improving the success rate of puncture and the user experience.
Vascular recognition mode: Is there a special mode, such as only showing arteries or veins (by identifying the direction of blood flow), which is very important for certain special treatments?

Image and data Management: Does the device support image taking, archiving, or connection to the hospital information system? This is of certain value for case recording, teaching and remote consultation.

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