1. Main detection depth

General depth: Most devices can detect veins 0.2 to 1.0cm beneath the skin, but the actual effective imaging range is usually concentrated on the shallower veins under the skin (0.2 to 1.0 cm).

Best effect: For clearly visible superficial veins (such as the back of the hand and forearm), the imaging effect is the best.



2. Key influencing factors

Skin condition

Skin color, fat thickness, edema or scar tissue can reduce penetration.

Patients with obesity or edema may have limited depth.

Equipment performance

The wavelength of the light source (usually near-infrared, approximately 750 to 980 nm) affects the tissue penetration.

The imaging algorithm and sensor sensitivity determine the ability to restore details.

Venous characteristics:

There are significant differences in vein diameter, blood filling degree and depth.

Deep veins (such as the femoral vein in obese patients) may not be clearly displayed.



3. Technical limitations

Non-penetrating deep blood vessels: Unable to detect arteries or visceral blood vessels, mainly used for superficial vein finder localization (such as infusion and blood drawing).

Auxiliary rather than substitute: It cannot completely replace deep imaging technologies such as ultrasound.



4. Common application scenarios

Patients with difficulty in venipuncture (children, the elderly, obese individuals).

Patients with arteriosclerosis or hidden veins caused by long-term intravenous infusion or chemotherapy.

1) Traditional Screening Methods and Their Limitations

Traditionally, the screening and staging of DR Mainly relied on color fundus photography to observe two-dimensional surface lesions such as retinal microaneurysms, hemorrhage and exudation. However, this method has limitations:

Strong subjectivity: Relying on the doctor’s experience.

Inability to observe deep structures: It is impossible to quantitatively assess the early structural damage of the retina, especially the early morphology of diabetic macular edema (DME).



2) The core role of OCT in the early detection of DR

OCT is a non-contact and non-invasive cross-sectional imaging technique, similar to “optical biopsy”, which can provide micrometer-resolution images of each layer of the retina. Its application in early DR Is mainly reflected in the following aspects:

1. Detect subclinical diabetic macular edema

Key finding: OCT can detect before clinically visible retinal thickening or hard exudation (visible in traditional fundus photography) occurs in patients:

A slight thickening of the inner layer of the retina.

Early and local damage to the outer structures of the retina (such as the ellipsoid zone and the external membrane).

Tiny cystoid hyporeflex cavities (early cystoid edema).

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 Vein Finder or desktop Vein Finder ? 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?

I. (Core Value: Unparalleled Diagnostic Capability

High-resolution, non-invasive “optical biopsy”

Traditionally, to make a clear diagnosis of many diseases, a biopsy was required, which involves taking a small piece of tissue and observing it under a microscope. This is an invasive operation.

OCT provides cross-sectional images similar to biopsies, but it is completely contactless and non-invasive. Doctors can directly observe the microstructure of the surface and subsurface layers of tissues inside the body without the need for cutting, significantly reducing risks and patient discomfort.



2. Real-time imaging, guiding treatment

OCT imaging is extremely fast and can provide images in real time. This enables doctors to immediately assess the condition of the tissue during surgery or interventional treatment, thereby making more accurate decisions.

For instance, during cardiovascular interventional surgery, doctors can view in real time the nature of the plaques within the blood vessels and the adhesion of stents.



Ii. (Main Application Fields and Specific Assistance）

The application of OCT has expanded from ophthalmology to multiple medical fields. Here are some of its most important applications:

Ophthalmology - the most mature and widely applied field

This is a prime example of the success story of OCT technology, which has completely transformed the diagnosis and treatment of retinal diseases.

Help

Diagnosis of macular diseases: Precise diagnosis and staging of age-related macular degeneration (AMD), macular edema, macular holes and other diseases is the gold standard.

Glaucoma management: By precisely measuring the thickness of the retinal nerve fiber layer (RNFL), early diagnosis of glaucoma and objective monitoring of disease progression can be achieved.

Diabetic retinopathy: Early detection of subtle changes and edema in the retina to guide treatment.

Impact on the industry: It has led ophthalmic diagnosis from subjective two-dimensional fundus photography to an era of objective and quantitative three-dimensional microstructure analysis.



2. Cardiology - A rapidly developing frontier field

Intravascular OCT (IV-OCT) enters the interior of blood vessels through slender catheters for imaging.

Help

Precise assessment of plaques: Clearly distinguish lipid plaques, fibrous plaques and calcified plaques, and identify easily ruptured “vulnerable plaques”, which is something that traditional angiography cannot achieve.

Optimizing stent implantation: During percutaneous coronary intervention (PCI), guiding doctors to select stents of appropriate size and accurately assessing whether the stents are fully adhered and sufficiently dilated after the operation significantly reduces the risk of restenosis and thrombosis after the operation.

Impact on the industry: It has advanced coronary intervention therapy from the era of “walking according to the route map” with angiography to the era of “navigating with a high-brightness map on” with precision.



3. Combination of oncology and endoscopy

Integrating the OCT probe into the endoscope enables deep scanning of suspicious areas simultaneously during endoscopic examinations of the digestive tract, respiratory tract, etc.

Help

Early cancer diagnosis: In the gastrointestinal tract, respiratory tract, bladder and other areas, distinguish benign lesions from early cancer, guide the biopsy location, and increase the positive rate of biopsy.

Determine the tumor boundary: Assist surgeons in determining the precise boundary of the tumor during surgery to ensure complete resection while preserving as much healthy tissue as possible.

Impact on the industry: It has enhanced the depth and accuracy of endoscopic examinations and promoted the screening and diagnosis capabilities for early-stage tumors.



4. Dermatology

Skin OCT is similar to ophthalmic OCT and can perform high-resolution imaging of the skin’s surface layer.

Help

Non-invasive diagnosis: It assists in the diagnosis of skin tumors such as basal cell carcinoma and melanoma, as well as inflammatory diseases like eczema and psoriasis.

Treatment monitoring: Non-invasive monitoring of the efficacy of drug treatment or laser treatment.

Impact on the industry: It has reduced the need for some diagnostic biopsies and provided new tools for the dynamic monitoring of skin diseases.



Iii. (Summary of the Overall Impact on the Healthcare Industry)

1. Enhance the level of diagnosis and treatment: Early diagnosis, precise staging and personalized treatment of diseases have been achieved.
   
   
2. Enhance patient experience: Through non-invasive or minimally invasive examinations, patients’ pain, risk of complications and recovery time are reduced.
   
   
3. Reduce medical costs: Although OCT devices themselves are expensive, they can lower overall medical expenses in the long run by avoiding unnecessary surgeries, optimizing the treatment process and reducing complications.
   
   
4. Promoting scientific research development: It provides powerful in vivo imaging tools for medical research, accelerating the development of new drugs and in-depth understanding of disease pathological mechanisms.