Injection Pen Dose Correction Mechanism
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Solution Overview
Problem
Existing medication delivery pens lack the ability to easily set and correct dosage prior to delivery, making them inconvenient for self-administration of medications like insulin, especially in public settings.
Innovation Solution
A pen-type medical injection device with a housing, lead screw, dose set member, setback member, and rotatable driver, allowing for axial movement of the lead screw during injection while preventing rotation during dose setting and correcting, enabling precise and adjustable dosage delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a standard hypodermic syringe is used for self-administration of medication, then the medication can be delivered, but the manipulation is inconvenient and embarrassing in public locations
Solution Approach 1:
The device separates the medication storage (cartridge) from the delivery mechanism (syringe barrel and needle assembly), allowing the user to simply attach the cartridge to the pen body and perform a single dialing action to set and deliver the dose, eliminating the complex multi-step manipulation of traditional syringes and vials
Solution Approach 2:
The device enables self-administration through an intuitive dialing mechanism that allows users to independently set and control the dosage without requiring assistance or complex procedures, making it suitable for use in public locations
2Ease of operation
If a medication delivery pen is used to facilitate self-administration, then convenience is improved, but the ability to easily set and correct dosage prior to delivery is lacking
Solution Approach 1:
The dialing mechanism allows dynamic adjustment of the dosage setting before delivery, enabling users to easily change the dose amount by rotating the dial to different positions, providing flexibility and adaptability in dosage selection
Solution Approach 2:
The device allows the user to pre-set the desired dosage by dialing before the actual injection occurs, enabling correction and adjustment of the dose setting prior to medication delivery
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
Facilitates easy and precise setting and correction of dosages, enhancing user convenience and reducing embarrassment in public settings by allowing for accurate and adjustable medication delivery.
Implementation Method 1
The driver rotates during an injection to rotate the lead screw and thereby axially move the lead screw
Implementation Method 2
A spring member is disposed within the upper body and biases the lead screw in the distal direction
Data Source
AI summary
An injection pen, comprising a housing, a lead screw axially moveable in the housing, a dose set member for dose setting and dose correcting, threadably connected to the housing and having a first mating feature, a setback member having a second mating feature for engaging the first mating feature, a clicker that generates an audible or tactile indication during operation, the clicker being operatively connected to the dose set member, and a push button operatively connected to the setback member to cause the second mating feature to engage the first mating feature during an injection, the push button receiving the clicker, wherein the first mating feature is disengaged from the second mating feature during dose setting and dose correcting and engaged with the second mating feature during an injection.