Syringe Piercing Means Fixation Without Adhesive Contamination
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Solution Overview
Problem
Existing methods for securing piercing means in syringes often result in contamination due to adhesive diffusion or require costly and precise manufacturing processes, which can compromise the integrity of sensitive medications.
Innovation Solution
A method involving shaping the distal end section of the syringe to securely contact the piercing means, providing a strong frictional attachment without additional adhesives, using shaping tools to form a channel that encases the piercing means along its circumference, and optionally applying an adhesive for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive connection is used to secure the cannula in the syringe, then the piercing means is firmly attached, but the adhesive components diffuse into the medium causing contamination
Solution Approach 1:
The harmful adhesive substance is extracted/removed from the system. The patent replaces adhesive connection with a mechanical friction-based connection, eliminating the source of contamination while maintaining secure attachment of the piercing means in the syringe cone
Solution Approach 2:
The chemical bonding mechanism (adhesive) is replaced with a mechanical friction-based connection. The conical geometry creates radial pressure and friction forces that secure the piercing means without requiring adhesive substances, thereby eliminating contamination risks
2Strength
If the channel diameter is reduced to improve adhesion, then the piercing means is more securely attached, but the manufacturing precision requirements increase
Solution Approach 1:
The patent changes the geometric parameters of the conical surface (angle, length, radius) to optimize the friction connection. By adjusting these parameters, secure attachment is achieved without requiring extremely precise channel diameter control, making the manufacturing process more robust
3Object-affected harmful factors
If radiation heating is used to achieve material connection, then adhesive is eliminated, but modified glass with special electromagnetic absorption properties is required
Solution Approach 1:
The thermal-radiation bonding process is replaced with a mechanical friction-based connection achieved through conical geometry. This eliminates the need for specialized glass compositions that absorb electromagnetic radiation, returning to standard glass materials
Solution Approach 2:
The conical geometry itself generates the securing force through friction and radial pressure during insertion, without requiring external energy input or special material properties. The structure serves its own function of securing the piercing means
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 method ensures the piercing means is securely attached with a pullout force of at least 30N, preventing contamination and eliminating the need for modified glass or precise stops, thus protecting sensitive medications and simplifying the manufacturing process.
Implementation Method 1
The distal end section (4) is in a formable state
Implementation Method 2
shaping the distal end section (4) by means of a first shaping tool (9) in such a way that an inner surface (10) of the distal end section (4) contacts at least portions of the piercing means (2)
Implementation Method 3
providing a strong frictional attachment without additional adhesives
Data Source
AI summary
The invention relates to a method for producing a syringe having a piercing means, comprising the following steps: a) providing a syringe body having a distal end section, which comprises an inner channel that discharges at a distal opening, wherein the distal end section is in a formable state; b) providing a piercing means; c) inserting a proximal section of the piercing means through the distal opening into the inner channel of the distal end section; and d) shaping the distal end section by means of a first shaping tool in such a way that an inner surface of the distal end section contacts at least portions of the piercing means, as a result of which at least portions of the piercing means are secured.