Multi-Lumen Intraocular Syringe With Retractable Needle Sheath
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Solution Overview
Problem
There is a need for improved, safer, and more reliable intravitreal injection devices and methods for treating retinal diseases.
Innovation Solution
A multi-lumen syringe with switchable configurations and actuators that ensure perpendicular insertion and stable contact with the eye, featuring fenestrated needles and cutting elements for precise injection and withdrawal of substances, along with integrated pressure measurement and control mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-lumen syringe is used, then the device structure is simple, but the reliability and safety of intravitreal injection is insufficient
Solution Approach 1:
The syringe is divided into multiple lumens (first lumen for injection, second lumen for withdrawal) that operate independently. Each lumen has its own plunger and needle configuration, allowing separate control of injection and withdrawal processes to improve reliability and safety
Solution Approach 2:
The syringe device performs multiple functions within a single unit: it can inject substances through the first lumen, withdraw fluids through the second lumen, and optionally perform both operations simultaneously or sequentially. This multi-functionality improves reliability by consolidating operations into one device
2Ease of operation
If the needle tip is made open and hollow for fluid delivery, then fluid can be delivered effectively, but the tip cannot be made narrow and sharp enough for safe insertion
Solution Approach 1:
The needle is segmented into two functional parts: a solid, sharp tip for piercing the eye and a hollow shaft with fenestrations for fluid delivery. This separation allows the tip to be optimized for insertion safety while the shaft provides fluid delivery capability
Solution Approach 2:
Different parts of the needle have different structures: the tip is solid and sharp for safe insertion, while the shaft contains hollow fenestrations for fluid delivery. This local differentiation of properties allows each part to perform its specific function optimally
3Manufacturing precision
If the syringe allows free needle extension, then the injection process is simple, but the stability and perpendicularity of needle insertion cannot be ensured
Solution Approach 1:
The needle is pre-positioned in a retracted state within the syringe body. Upon activation, the needle automatically extends to the required position, ensuring consistent and perpendicular insertion angle without requiring manual adjustment during the procedure
Solution Approach 2:
The needle is designed to be movable between retracted and extended positions, allowing it to dynamically adapt to the injection requirement. The needle extends only when needed for injection, providing both precision and operational simplicity
4Measurement precision
If multiple actuators are added to control needle extension, then the control precision and safety are improved, but the device complexity increases
Solution Approach 1:
The control system is segmented into multiple independent actuators (first actuator for first lumen, second actuator for second lumen) that can be controlled separately. This segmentation allows precise control of each function while maintaining independent operation
Solution Approach 2:
The syringe system automatically controls needle extension and retraction based on plunger movement and pressure conditions. The actuators are triggered by the injection/withdrawal process itself, reducing the need for external control mechanisms and simplifying the overall system
Data Source
AI summary
There is provided herein a multi-lumen syringe for intraocular injection, including a first lumen, a second lumen, one or more needles fluidly connected to the lumens, and a needle sheath disposed about the one or more needles; wherein the needle sheath includes a plurality of n proximity/contact/pressure actuators on a distal rim of the needle sheath; wherein the syringe is switchable between at least two configurations: a first configuration in which at least one of the actuators is not actuated and each tip of the one or more needles is proximally positioned, and secured, relative to the distal rim; and a second configuration in which the n actuators are actuated, and the one or more needles are allowed to distally extend beyond the distal rim.