1. Patients with difficulty in venipuncture

Typical population

Obese people (with thick subcutaneous fat layers and deeply hidden veins).

Infants and children (with thin blood vessels and low cooperation).

The elderly (with poor vascular elasticity and prone to rolling).

Patients who have received long-term intravenous infusion or chemotherapy (with hardened blood vessels and many scars).

Scene value

Reduce the number of repeated punctures (for example, from an average of 3 to 1) to lower the patient’s pain and the risk of complications (such as hematoma).



2. People with dark skin

Problem: Traditional visual/touch methods have difficulty locating veins in dark skin.

Technical adaptation

Choose multi-wavelength Vein Finder (for example, 850nm infrared light has better penetration).

Contrast adjustment function (such as the “Dark Skin Mode” of VeinViewer).



3. Emergency and critically ill patients

Applicable scenarios

Patients with shock/dehydration (vascular collapse).

Rescue for massive hemorrhage (rapid establishment of intravenous access is required).

Case: The emergency department uses AR projection devices (such as AccuVein) to locate the external jugular vein within 5 seconds.



4. Patients with chronic diseases and special treatment needs

Diabetes: Monitor the condition of blood vessels on the back of the hand/foot to prevent ulcers.

Hemodialysis: Protect the fistula and prevent accidental puncture.

Blood transfusion/plasma exchange: Ensure the precise establishment of high-flow pathways.



5. Areas with insufficient medical resources

Primary clinics: Making up for the lack of experience among medical staff.

Battlefield/Disaster rescue: Rapid operation under poor lighting and rudimentary equipment conditions.



6. Users outside the medical field

Veterinarian: Intravenous infusion for pets (such as the ear vein of cats and dogs).

Tattoo artist/beautician: Avoid injecting fillers into blood vessels or getting tattoos.

Medical student teaching: Vascular anatomy visualization teaching AIDS.

Also welcome to contact us, we are ZD Medical Inc.
Tel : +86-187 9586 9515
Email : sales@zd-med.com
Whatsapp/Mobile : +86-187 9586 9515

I. Core Technical Principles

Near-infrared imaging (NIR Technology)

The absorption characteristics of hemoglobin: Deoxyhemoglobin in veins has a higher absorption rate for near-infrared light of specific wavelengths (typically 700-900nm) than that in surrounding tissues.

Reflection difference imaging: The device emits near-infrared light onto the skin, and the camera captures the reflection signal. Through algorithms, the veins are contrasted and enhanced with the surrounding tissues to form a clear image.

Multispectral imaging (optional technology)

Some high-end devices combine visible light and near-infrared light and adapt to different skin tones (such as patients with dark skin) through multispectral analysis.

AI image processing

Edge enhancement algorithm: Highlighting vein contours and reducing noise interference.

Depth prediction: Estimate the depth of veins through reflection intensity to assist in locating deep veins.



Ii. Enhanced Features of Desktop Design

Stable projection system

Fixed projector: Avoid the shaking of  handheld devices Vein Finder and precisely project vein images onto the skin surface (such as green/red contours).

Adjustable stand: Freely adjust the height and Angle to fit different parts such as the arm, back of the hand, and foot.

High-precision camera

Equipped with high-resolution sensors, it captures subtle vascular signals in real time and, in combination with the optical zoom function, magnifies local areas.

Environmental adaptability

Automatic calibration: Dynamically optimize imaging parameters based on ambient light and skin color.

Anti-interference design: Reduce the influence of surgical lamps or other light sources on imaging.



Iii. Work Process (Taking Blood Drawing as an Example)

Step 1: Patient localization

The patient placed his arm flat under the device and kept it stable.

Step 2: Quick scan

The device emits near-infrared light, generating a vein distribution map within 1-2 seconds and projecting it in real time.

Step 3: Vascular selection

Medical staff select the best puncture site (such as thick, straight, and unbifurcated veins) through screen or projection markers.

Step 4: Precise puncture

1.Thickening of subcutaneous fat

• Deeper vein location: The subcutaneous fat layer of obese people is thicker, which may cause the veins to be covered by fat, making them deeper and difficult to accurately locate through visual observation or touch (palpation).
  
• Blurred touch: Adipose tissue weakens the elastic touch of veins finder, making it difficult for medical staff to determine the location and direction of veins through touch.
  
  2. Venous physiological changes
  
• Venous compression or concealment: Obesity may cause veins to be compressed or encapsulated by surrounding adipose tissue, further concealing their location.
  
• Circulatory problems: Obesity is often accompanied by diseases such as hypertension and diabetes, which may cause venous hardening, reduced elasticity or vasoconstriction, increasing the difficulty of puncture.
  
  3. Clinical operation challenges
  
• Reduced success rate: Research shows that the initial success rate of venipaspiration in obese patients is relatively low, and multiple attempts may be required.
  
• Enhanced reliance on technology: Medical staff may need to rely on tools (such as ultrasound-guided) or longer needles, or choose special puncture sites (such as the back of the hand or the veins in front of the elbow).
  
  4. Other influencing factors
  
• Skin condition: Obese individuals may develop skin wrinkles or edema, which further mask the veins.
  
• Patient position: Some positions (such as hanging arms) may help fill the veins, but obese individuals may have difficulty cooperating due to limited movement.
  
  Coping strategy
  
• Ultrasound-guided: Real-time ultrasound imaging can precisely locate deep veins.
  
• Hot compress or making a fist: Promote blood vessel dilation and increase venous visibility.
  
  Experienced operators: Skilled medical staff can increase the success rate through anatomical landmarks and experience.
  
  Summary
  

  Obesity does increase the difficulty of venipesis, but it can be effectively dealt with through technical means and clinical experience. This conclusion is clearly supported in both medical literature and clinical practice (such as the Journal of Emergency Medicine and Nursing Research).

  
  

  Also welcome to contact us, we are ZD Medical Inc.
  Tel : +86-187 9586 9515
  Email : sales@zd-med.com
  Whatsapp/Mobile : +86-187 9586 9515

In medical practice, green light (with a wavelength of about 540nm) is generally considered the color of visible light that is most helpful in locating veins. Here’s the explanation:



1. Optical principle:

• Deoxyhemoglobin in Vein Finder has a higher absorption rate of green light, while surrounding tissues (such as skin and fat) reflect more green light. This contrast between absorption and reflection makes the veins appear as dark lines under green light, making them easier to identify.
  
  In the visible spectrum, green light (520-580nm) is close to the absorption peak of deoxygenated hemoglobin, optimizing the contrast between the veins and the surrounding tissue.
  
  
  
  2. Clinical application:
  
• Medical devices (such as venous imaging AIDS) often use green LED light sources or filters, especially for patients with thin veins, darker skin or obesity.
  
• Green background light may also be used in the operating room to enhance vascular visibility and assist medical staff in operation.
  
  3. Limitations of other colors:
  
• Red light has strong penetration but low contrast, because hemoglobin absorbs less red light;
  
• Blue light scatters more, which may reduce clarity;
  
• Near-infrared light is effective, but requires imaging technology to convert to visible light, not directly belonging to the visible spectrum.
  
  

  Green light has become the preferred visible light color for assisting vein localization by enhancing the contrast between hemoglobin absorption and tissue reflection, and is widely used in clinical difficult venipentesis scenes.

  

  Also welcome to contact us, we are ZD Medical Inc.
  Tel : +86-187 9586 9515
  Email : sales@zd-med.com
  Whatsapp/Mobile : +86-187 9586 9515