Implant Syringe Cannula Unit for Simpler Assembly and Filling
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Solution Overview
Problem
Existing implant syringes face complications in assembly and filling processes, particularly due to the securement of the cannula with adhesive, leading to potential errors and increased waste if assembly is incorrect.
Innovation Solution
The cannula is rigidly connected to a storage element forming a separate unit, allowing for simplified assembly and filling by enabling axial movement with an outer sleeve, and featuring a blocking device for controlled retraction, with the cannula being overmoulded and secured by a plastic material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cannula is secured with adhesive in the needle holder after full assembly, then the cannula is fixed in position, but the assembly process becomes complicated and time-consuming
Solution Approach 1:
The device is divided into separate functional units: the cannula is assembled independently with the storage element, then inserted as a complete unit into the needle holder. This segmentation allows each component to be prepared separately and assembled in a straightforward sequence, eliminating complicated post-assembly adhesive securing steps.
2Reliability
If the cannula is secured with adhesive after full assembly, then the cannula is fixed, but the entire applicator must be discarded if assembly is incorrect
Solution Approach 1:
By separating the cannula assembly from the main applicator body, only the cannula and storage element need to be discarded if assembly issues arise, rather than the entire applicator. This reduces material waste while maintaining secure fixation through the mechanical insertion design.
3Manufacturing precision
If the solid material implant is inserted into the storage element held within the inner sleeve, then the implant is positioned, but the insertion process becomes complicated
Solution Approach 1:
The solid material implant is pre-inserted into the storage element before the storage element is attached to the needle holder. This preliminary action simplifies the overall process by eliminating the need to manually insert the implant through the inner sleeve after assembly, reducing complexity while maintaining precise positioning.
4Ease of manufacture
If the cannula and storage element are manufactured separately and assembled, then manufacturing flexibility is improved, but assembly time increases
Solution Approach 1:
The cannula and storage element are pre-assembled into a complete unit before final insertion into the needle holder. This preliminary assembly allows for flexible manufacturing of individual components while minimizing final assembly time, as the pre-assembled unit requires only a single insertion step.
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 design simplifies the assembly and filling process, reduces manufacturing time and costs, and minimizes waste by allowing only the cannula and storage element to be discarded if issues arise, while ensuring secure implant delivery.
Implementation Method 1
a storage element (2) for receiving a solid material implant (6)
Implementation Method 2
The cannula is overmoulded with the storage element
Data Source
AI summary
An implant syringe includes a cannula, a storage element for receiving a solid material implant, and an outer sleeve with a radially projecting front gripping section which are axially movable together. An inner sleeve affords axial slits through which radial webs on the outer sleeve engage, and also includes a rod-shaped piston. The rod-shaped piston may be advanced through the storage element into the cannula such that a gap remains between the tip of the cannula and the head end of the piston. The cannula is rigidly connected to the storage element to form a cannula unit, that the webs on the outer sleeve are attached to an annular receiving member within the inner sleeve and that the cannula unit is insertable into the receiving member and is lockable therein, where a solid material implant can be inserted into the storage element.