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).

  
  

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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.

  

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