Artery Visualization Device Using Wrist Compression Protrusion
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Solution Overview
Problem
Existing techniques for visualizing arteries, particularly the radial artery, are cumbersome and expensive, requiring precise pressure measurement and adjustment while observing near-infrared images during procedures, which complicates the artery puncture process.
Innovation Solution
A wrist placement table with a protrusion that compresses the skin on the back side of the wrist, allowing near-infrared light to be incident and received effectively, eliminating the need for pressure sensors by using a specific table design that naturally compresses the capillary plexus, providing a clear artery image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor and pressure adjustment unit are used to compress the skin at appropriate pressure, then the capillary plexus collapses and artery images become clear, but the device complexity and operational burden increase
Solution Approach 1:
The placement table's protrusion automatically compresses the skin to the appropriate pressure through its geometric design and the patient's body weight, eliminating the need for external pressure sensors and adjustment units. The system serves itself by using the patient's own weight applied through the oblique surface to generate the required compression force.
Solution Approach 2:
The oblique back of hand contact portion acts as an intermediary that converts the patient's body weight into appropriate compression pressure on the skin. This geometric mediator automatically transforms the vertical gravitational force into the optimal compressive force needed to collapse capillaries without requiring active pressure control systems.
2Reliability
If pressure adjustment is performed while observing near-infrared images, then appropriate compression is achieved, but the procedure becomes time-consuming and complex
Solution Approach 1:
The placement table is pre-designed with specific geometric parameters (oblique angle, protrusion height) that automatically provide the correct compression pressure as soon as the patient places their hand on it. The compression action is performed preliminarily and automatically before the puncture procedure begins, eliminating the need for time-consuming pressure adjustment during the procedure.
3Measurement precision
If ultrasonic diagnostic device is used to visualize arteries, then accurate artery location is achieved, but the cost and procedural complexity increase
Solution Approach 1:
The patent replaces expensive ultrasonic diagnostic equipment with a simple, inexpensive placement table featuring a geometric protrusion. This low-cost structure achieves comparable artery visualization by using near-infrared imaging combined with mechanical compression, eliminating the need for costly medical imaging devices while maintaining sufficient precision for puncture procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for stable and clear visualization of arteries without the need for pressure sensors, enabling safe and reliable puncture procedures with improved ease and cost-effectiveness.
Implementation Method 1
human tissues such as skin, fat, and muscle are highly transmissive to near-infrared light
Implementation Method 2
hemoglobin in blood absorbs near-infrared rays
Implementation Method 3
the skin on the back side of the wrist is compressed by the light guide portion at appropriate pressure to collapse the capillary plexus
Data Source
AI summary
An artery visualization device for irradiating skin on the wrist back side with near-infrared light and forming near-infrared image of the wrist includes a placement table on which the wrist is placed, an irradiation unit including a light source emitting near-infrared light, imaging unit receiving light and forming wrist near-infrared image, the light incidents on the skin on the wrist back side and exiting from skin on the front, optical filter, and monitor. The artery visualization device includes a protrusion protruding from a placement table wrist placement surface. The protrusion compresses the back side skin on the wrist placed on the placement table from the back side, and irradiates the near-infrared light emitted from the light source to the skin on the back. The placement table includes a center placement portion and back of hand contact portion. The back of hand contact surface intersects obliquely with a wrist placement surface.