Cannulation System With Needle Retraction For Safety
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Solution Overview
Problem
Current hemodialysis needles are sharp and large gauge, posing a risk of damage to patients' vascular access and surrounding tissues, and require precise placement, which can be challenging for medical providers, also exposing them to needle sticks.
Innovation Solution
A cannulation system comprising a cannula with a coaxial needle and a needle retraction assembly that includes a spring mechanism and safety enclosure, allowing the needle to be retracted into the enclosure after use, along with support wings for stability and adhesive for secure attachment to the skin, and a Luer lock system for connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard sharp large gauge needles are used for hemodialysis, then vascular access can be established, but the risk of damage to vascular access and surrounding tissues increases
Solution Approach 1:
The needle is nested inside the cannula in a coaxial arrangement, with the needle retractable into the cannula. This nested structure allows the sharp needle to be concealed within the protective cannula sheath, eliminating the harmful sharp tip exposure while maintaining the ability to pierce vascular access when needed.
Solution Approach 2:
The cannula acts as an intermediary protective element between the sharp needle and the patient's tissue. The cannula provides a protective sheath that reduces direct contact between the sharp needle and surrounding tissues, thereby mitigating tissue damage while still enabling vascular access establishment.
2Manufacturing precision
If precise needle placement is required for hemodialysis, then vascular access can be established, but the difficulty of the procedure increases for medical providers
Solution Approach 1:
The coaxial nested arrangement of needle within cannula provides structural guidance and alignment, making the device more stable and easier to handle during insertion. The cannula acts as a guide sheath that facilitates precise needle placement while reducing the skill level required for successful cannulation.
3Reliability
If standard needles are used for cannulation, then vascular access can be obtained, but the risk of needle stick injuries to medical providers increases
Solution Approach 1:
The harmful sharp needle is extracted from direct exposure and retracted into the protective cannula sheath after vascular access is established. This separation removes the harmful element from the operational field, eliminating the needle stick risk to providers while maintaining successful vascular access.
Solution Approach 2:
The cannula serves as an intermediary protective barrier that isolates the sharp needle from contact with medical providers. By concealing the needle within the cannula sheath, the system prevents direct exposure and eliminates the hazard of accidental needle sticks.
4Object-affected harmful factors
If a needle retraction mechanism is added to the cannulation system, then safety is improved, but the device complexity increases
Solution Approach 1:
The retraction mechanism utilizes the existing nested coaxial structure of needle within cannula, extending the protective function rather than adding separate complex components. The spring-loaded retraction system integrates with the nested arrangement, providing safety functionality while maintaining structural simplicity.
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
The system reduces the risk of vascular damage and needle stick injuries by providing a safe and secure method for needle retraction, allowing for precise placement and easy handling, enabling patients to self-cannulate and improving the safety and efficiency of hemodialysis procedures.
Implementation Method 1
a needle retraction assembly that includes a spring mechanism
Data Source
AI summary
A system comprises a cannula and a needle, with the cannula and needle coaxially arranged, a needle retraction assembly configured to retract the needle, and a safety enclosure wherein the needle retraction assembly is configured to draw the needle out of the cannula and into the safety enclosure.