Dispensing Device Axial Control via Sloped Path
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Solution Overview
Problem
Existing dispensing devices for medical and cosmetic applications suffer from structural complexity and reliability issues, particularly with the coupling mechanism between the protective cover and pinion, which can lead to jamming and damage to the needle tip or silicone layer, affecting user safety.
Innovation Solution
A dispensing device design where the control body moves axially unchanged during rotary actuation, eliminating the need for a clutch device and using a simplified structure with diametrically opposite control parts to actuate the connecting body, ensuring secure and reliable operation with conventional plastic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pinion with guide knobs and slotted-guide tracks is used to convert rotary movement to axial displacement, then the connecting body can be moved from initial position to extraction position, but the structural complexity increases and reliability decreases due to jamming risks
Solution Approach 1:
The invention extracts and eliminates the problematic pinion component with guide knobs and slotted-guide tracks from the system. Instead of using this complex coupling mechanism, the patent employs a simplified direct connection where the control body's control part abuts directly with the control path of the connecting body, removing the source of jamming and structural complexity while maintaining the essential function of converting rotary movement to axial displacement.
Solution Approach 2:
The invention inverts the traditional approach by making the control body axially immobile rather than axially movable. In conventional designs, the control element (pinion) moves axially to drive the connecting body. The patent reverses this by keeping the control body fixed axially and allowing the connecting body to move axially in response to rotary actuation of the control body, thereby eliminating the need for complex clutch devices and guide mechanisms.
2Strength
If the pinion fits tightly over the cannula during manufacture, then the connection is secure, but the needle tip and silicone layer are easily damaged
Solution Approach 1:
The invention removes the pinion component that causes damage during assembly. By eliminating the pinion and its tight fit requirement over the cannula, the source of mechanical damage to the needle tip and silicone layer is completely removed, while the connecting body still achieves secure connection through its direct control path engagement with the control body.
Solution Approach 2:
The invention introduces the control path as an intermediary mechanism between the control body and the connecting body. This control path translates rotary movement of the control body into axial displacement of the connecting body without requiring tight interference fits that could damage the cannula or needle, thereby mediating the force transmission in a gentler manner.
3Ease of operation
If an axially movable pinion is used to transmit actuating torque, then the connecting body can be displaced axially, but a clutch device is required to permit axial movement
Solution Approach 1:
The invention inverts the motion transmission approach by making the control body axially fixed rather than movable. The control body rotates in place, and its control part follows the sloped control path to directly drive axial displacement of the connecting body. This eliminates the need for clutch devices that would be required to accommodate axial movement of an axially movable control element.
Solution Approach 2:
The invention replaces the complex mechanical clutch device with a simplified sloped control path geometry. The inclined control path inherently converts rotary motion of the control body into axial motion of the connecting body through geometric constraint, eliminating the need for additional mechanical components like clutches that would be required in traditional axial-movement-based systems.
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 design enhances functional reliability and safety by preventing jamming and damage, allowing for secure axial displacement of the connecting body without axial movement of the control element, thus ensuring effective and pain-free application processes.
Implementation Method 1
the respective control part follows the rotary movement relative to the housing part in an axially unchanged manner and, via the respective control path of the connecting body, which has a slope, moves the connecting body from the initial position to the extraction position
Data Source
AI summary
A dispensing device includes a container with a receiving space containing a dispensable medium extractable via a dispensing element. A control body (19) with a connecting body (11) is longitudinally displaceable in a housing part (9), from an inactive base position to an active extraction position by a rotational movement. A media-carrying connection is created between the receiving space and the dispensing element. A control part of the control body (19) can be attached to a control path (54) of the connecting body (11). When the control body (19) moves rotationally relative to the housing part (9), each control part follows the rotational movement in an axially unchanged manner and brings the connecting body from the base position to an extraction position via each associable control path (54) of the connecting body (11). The control path comprises a slope.