Movable Shield for Compression Syringe Preventing Needle Sticks
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Solution Overview
Problem
Existing compression syringes pose a risk of accidental needle sticks during cap replacement, as users may inadvertently expose themselves to the used needle cannula tip when attempting to cover it after use.
Innovation Solution
A safety shield system with a movable shield portion that transitions from a retracted position exposing the needle cannula tip for administration to an extended position covering it, utilizing a combination of retaining means, such as frangible connections and sliding or pivoting mechanisms, to ensure safe automatic or manual deployment after use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a protector cap is used to cover the needle cannula after use, then needle tip coverage is achieved, but accidental needle sticks occur during cap replacement
Solution Approach 1:
The safety shield system is divided into a holder shield portion (fixed to the syringe) and a movable shield portion (that can slide to cover the needle). This segmentation allows the coverage function to be separated from the manual manipulation required in cap replacement, eliminating the harmful effect of accidental sticks while preserving ease of operation.
Solution Approach 2:
The movable shield portion is pre-positioned in a retracted state during storage and transport. Upon activation (either automatically or manually), it slides forward to cover the needle tip. This preliminary positioning ensures the needle is covered immediately after use without requiring the user to perform a separate capping action, thus preventing accidental sticks.
2Object-affected harmful factors
If the movable shield portion is always in the extended position to cover the needle, then needle protection is maximized, but needle accessibility for administration is blocked
Solution Approach 1:
The shield portion transitions from a static fixed-position design to a dynamic movable design. It can be positioned in two states: retracted (allowing needle access for administration) and extended (providing needle coverage after use). This dynamic capability resolves the contradiction by allowing the system to adapt its protection level based on the operational phase.
Solution Approach 2:
The position parameter of the movable shield portion is changed between two discrete states: retracted position (for needle access) and extended position (for needle coverage). This parameter change allows the system to switch between providing needle accessibility and maximizing needle protection, resolving the contradiction between these two requirements.
3Reliability
If retaining means are used to prevent premature shield movement, then shield positioning control is improved, but device complexity increases
Solution Approach 1:
The retaining means employs simple, disposable components such as frangible connections or elastic catches that are integrated into the single-use syringe system. These components provide reliable positioning control during use but are designed to be discarded with the syringe after one use, avoiding the complexity of reusable, adjustable mechanisms while maintaining reliability during the product's service life.
Data Source
Figure 1~2
Figure 3~4
Figure 3b~3d
AI summary
A safety shield system (60) for a compression syringe (10) having a compressible reservoir (46), a needle cannula (12) for fluid communication with the reservoir (46) and having a forward tip (16), the safety shield system (60) having at least a holder shield portion (62) designed to be attached to the compression syringe (10), and a movable shield portion (64), designed to be movable relative to the compression syringe (10) from a first position wherein the tip (16) is exposed, to a second position wherein the movable shield portion (64) covers the tip (16). The holder shield portion (62) and movable shield portion (64) being provided with retainer (51, 52, 70) arranged to cooperate in the first position to prevent the movable shield portion (64) from moving toward its second position.