Medicament Delivery Device Pressure Release Mechanism
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Solution Overview
Problem
Existing medicament delivery devices face challenges in delivering precise doses of high viscosity medicaments due to residual pressure and dripping issues, requiring excessive force and causing irritation when treating patients.
Innovation Solution
A medicament delivery device with a pressure release mechanism that includes a movable wall part, pressure member, driving means, and activation means, allowing for precise dose delivery and subsequent pressure release to prevent residual medicament expulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure means are used to deliver high viscosity medicament through small needle passage, then the medicament can be delivered through the needle, but a rather large force is required and residual pressure causes dripping from the needle
Solution Approach 1:
The patent employs a spring mechanism that dynamically adjusts pressure during injection. The spring compresses to build pressure for delivering high viscosity medicament through the needle, then releases to create negative pressure that prevents dripping. This dynamic pressure adjustment resolves the contradiction between delivering complete doses and preventing residual expulsion.
Solution Approach 2:
The invention changes the pressure parameter over time during the injection process. Initially, positive pressure is applied to force the viscous medicament through the small needle passage, then the pressure is reversed to negative values to suck back any residual drops. This parameter transformation resolves the contradiction between complete delivery and preventing dripping.
2Reliability
If large force is applied to inject high viscosity medicament, then the medicament can be delivered through small needle passage, but operator fatigue increases due to many small injections needed
Solution Approach 1:
The spring mechanism is pre-compressed before injection, storing elastic energy in advance. When activation occurs, this stored energy automatically provides the large force needed to push high viscosity medicament through the small needle passage, eliminating the need for the operator to manually apply large forces repeatedly and thus reducing operator fatigue.
3Measurement precision
If stopper is moved predetermined distance to deliver dose, then specific quantity of medicament is delivered, but prevailing pressure remains due to elasticity of components causing dripping
Solution Approach 1:
The spring mechanism is designed to automatically reverse pressure direction after delivering the predetermined dose. Once the stopper reaches its predetermined travel distance and delivers the correct quantity, the spring's elastic recovery creates negative pressure that counteracts the prevailing positive pressure, preventing dripping before it can occur.
4Adaptability or versatility
If manual syringe is used to inject gel-based substances, then injection can be performed, but excessive force is required making it tiresome for operator
Solution Approach 1:
The patent replaces the manual mechanical pushing action with an elastic spring mechanism. The spring automatically generates and controls the large forces needed to inject gel-based substances through small needle passages, substituting the operator's mechanical effort with elastic energy storage and release, thereby eliminating operator fatigue while maintaining the ability to inject viscous materials.
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 device effectively prevents medicament dripping after injection by releasing pressure, reducing operator fatigue and minimizing unwanted substance expulsion, applicable to both high and low viscosity medicaments.
Implementation Method 1
pressure member arranged to exert pressure on the medicament inside the container for expelling a certain predetermined quantity of the medicament through the opening
Implementation Method 2
pressure release means for releasing the pressure on the medicament after the predetermined dose has been expelled through the opening
Implementation Method 3
spring means for exerting a pressure on the medicament for delivering a specific dose, i.e. pushing the plunger rod and thus the stopper into the container
Data Source
AI summary
The present invention relates to a device for delivering medicament, comprising a container (12) arranged to contain medicament, which container further comprises an opening arranged to expel medicament from the container, pressure means (16, 18) arranged to exert pressure on the medicament inside the container (12) for expelling a certain predetermined quantity of the medicament through the opening, driving means (26, 42) for driving said pressure means (16, 18), and activation means (46) for activating said driving means (26, 42) wherein said device comprises pressure release means (20) which are adapted, arranged and designed such that, when the predetermined dose has been expelled through the opening, the pressure on the medicament is released.