Rotatable Cannulation Site Selection Template for Vascular Access
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Solution Overview
Problem
Conventional methods for locating and cannulating vascular access sites in hemodialysis procedures are prone to error, leading to complications such as rupture, bleeding, hematoma formation, and graft failure due to the difficulty in accurately identifying the correct puncture site through palpation alone.
Innovation Solution
A rotatable cannulation site selection apparatus featuring a template with visible markings that allows for precise alignment and rotation of cannulation sites along a subcutaneous vascular access vessel, minimizing trauma and maximizing the longevity of the vascular access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional palpation methods are used to locate cannulation sites, then the procedure is simple to perform, but the measurement precision and reliability of site identification deteriorate
Solution Approach 1:
The template is divided into multiple marked positions corresponding to different cannulation sites along the vascular access vessel. Each mark represents a specific location that can be selectively used, allowing precise identification without requiring complex imaging or navigation systems.
Solution Approach 2:
The template acts as an intermediary device placed on the skin surface to bridge the gap between external observation and internal vessel location. The marked positions on the template correspond to optimal cannulation sites, providing a visual guide that mediates between simple palpation and precise needle insertion.
2Productivity
If repeated cannulation is performed at the same site, then the procedure is efficient, but the harmful factors such as traumatic breakdown, stenosis, and graft failure increase
Solution Approach 1:
The system enables dynamic rotation through 360 degrees around the vascular access vessel, allowing the cannulation site to be changed with each dialysis session. This dynamic site selection prevents repeated trauma to the same location while maintaining procedural efficiency.
Solution Approach 2:
The template implements a periodic rotation schedule where cannulation sites are systematically changed in a rotational pattern. This periodic action ensures that different segments of the vascular access vessel are used over time, allowing tissue recovery and preventing cumulative trauma.
3Ease of operation
If the vascular access vessel lies deep below the skin surface, then the surgical creation is feasible, but the ease of operation for locating the vessel deteriorates
Solution Approach 1:
The template creates a surface copy or map of the underlying vascular access vessel pathway. By placing the template on the skin and aligning it with palpable landmarks, the marked positions replicate the optimal cannulation sites without requiring direct visualization or complex imaging of the deep vessel.
4Reliability
If needle insertion is performed without precise site selection, then the procedure is quick, but the reliability and longevity of the vascular access deteriorate
Solution Approach 1:
The template allows preliminary identification and marking of optimal cannulation sites before needle insertion. By pre-positioning the template and selecting the appropriate marked position based on rotation schedule and anatomical landmarks, the system prepares the optimal insertion point in advance, ensuring reliable access while minimizing actual procedure time.
Data Source
AI summary
An apparatus is provided for rotatable selection of sites for cannulation with a needle along a subcutaneous vascular access vessel. The cannulation site selection apparatus comprises a template having an inner surface and an outer surface, and a plurality of visible markings on the outer surface of the template. The template is adapted to be disposed adjacent the subcutaneous vascular access vessel such that the markings align with the cannulation sites along the vascular access vessel for selecting a site for cannulation with a needle into the vascular access vessel.