Pressure Jacket Syringe Retaining Element Axial Movement
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Solution Overview
Problem
Existing fluid injectors with pressure jackets face challenges in preventing axial movement of syringes during high-pressure injections, leading to inaccurate volume delivery and potential syringe deformation due to radial expansion.
Innovation Solution
A pressure jacket design with syringe retaining elements, such as radially extendable and retractable fingers or a compressible ring, that can move between disengaged and engaged positions to limit or prevent axial movement of the syringe, utilizing an actuation mechanism and biasing members to maintain the syringe in place during pressurized delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pressure jacket is used to prevent radial expansion of the syringe during high-pressure injection, then the syringe can withstand high injection pressures, but axial movement of the syringe occurs leading to inaccurate volume delivery
Solution Approach 1:
The pressure jacket incorporates movable retaining elements (fingers or compressible ring) that can dynamically adjust between engaged and disengaged positions. During high-pressure injection, these elements engage to prevent axial movement of the syringe, while during low-pressure phases they disengage to allow syringe insertion and removal, thus resolving the contradiction between maintaining pressure withstanding capability and ensuring volume delivery accuracy
Solution Approach 2:
The pressure jacket is segmented into functional zones: the main cylindrical body for radial containment, and separate retaining elements (fingers or compressible ring) for axial restraint. This segmentation allows the pressure jacket to independently address radial expansion prevention while the segmented retaining elements specifically address axial movement control, thereby improving volume delivery accuracy without compromising pressure withstanding capability
2Measurement precision
If a holding bracket or distal locking cap is provided to prevent axial movement of the syringe, then volume delivery accuracy is maintained, but the device complexity increases
Solution Approach 1:
The retaining elements (fingers or compressible ring) are merged with the pressure jacket structure itself rather than being separate components like holding brackets or locking caps. The fingers are integrally formed with the pressure jacket, and the compressible ring is received within a pocket formed in the pressure jacket, thereby maintaining volume delivery accuracy while reducing device complexity by eliminating separate retaining mechanisms
Solution Approach 2:
The compressible ring utilizes the injection pressure itself to engage with the syringe and prevent axial movement. During high-pressure injection, the compressed ring automatically engages the syringe, eliminating the need for external actuation mechanisms. This self-service approach maintains volume delivery accuracy while minimizing device complexity by using the process pressure to effect the retaining action
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 solution effectively restricts axial movement of the syringe, ensuring accurate volume delivery and preventing syringe deformation by enhancing frictional forces between the syringe and pressure jacket, thereby maintaining the syringe within the jacket during high-pressure injections.
Implementation Method 1
at least one biasing member positioned within the pressure jacket and operatively connected to the at least one syringe retaining element
Implementation Method 2
enhancing frictional forces between the syringe and pressure jacket, thereby maintaining the syringe within the jacket during high-pressure injections
Data Source
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AI summary
A pressure jacket configured for connecting to an injector head of a fluid injector has an open distal end, an open proximal end, and a sidewall defining a throughbore extending between the distal end and the proximal end along a longitudinal axis. The throughbore is configured for receiving at least a portion of a syringe. The pressure jacket has at least one syringe retaining element positioned at least partially within the throughbore. The at least one syringe retaining element is configured for engaging at least a portion of the syringe during pressurized delivery of fluid from the syringe to prevent or limit a distal movement of the syringe relative to the pressure jacket.