Slidable Sheath Injection Device for Depth Control
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Solution Overview
Problem
Conventional injection devices lack precision in controlling needle penetration depth and injection volume, which is crucial for procedures like Botox bladder injections for treating neurogenic overactive bladder, where consistent and controlled delivery is necessary for efficacy.
Innovation Solution
An injection device with a slidable sheath and outlet tube configuration, along with a plunger system featuring notches for controlled material expulsion, allows for adjustable penetration depth and volume, enabling consistent multi-site injections by setting and maintaining a predetermined depth and volume per injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional injection devices are used, then the procedure can be completed, but the needle penetration depth and injection volume cannot be precisely controlled
Solution Approach 1:
The outlet tube is designed to be slidable within the sheath, allowing dynamic adjustment of the extended length to control penetration depth. The adjuster mechanism enables the outlet tube to move between retracted and extended positions, providing precise depth control while maintaining a relatively simple overall device structure.
Solution Approach 2:
The injection device is divided into distinct functional segments: the sheath, the outlet tube, and the adjuster mechanism. This segmentation allows independent control of each component, enabling precise adjustment of penetration depth without complicating the entire device structure.
2Measurement precision
If conventional injection devices are used, then injections can be performed, but the injection volume cannot be precisely controlled
Solution Approach 1:
The adjuster mechanism is configured to pre-set the extended length of the outlet tube before injection. By adjusting the outlet tube position in advance, the injection volume is predetermined and controlled, eliminating the need for complex real-time monitoring systems during the injection process.
3Measurement precision
If manual depth adjustment is required for each injection, then precise depth control can be achieved, but the procedure time increases
Solution Approach 1:
The slidable outlet tube design allows rapid adjustment between different penetration depths by simply moving the tube within the sheath, eliminating the need for time-consuming manual reconfiguration of the entire injection device between injections.
Solution Approach 2:
The adjuster mechanism serves multiple functions: it controls penetration depth, regulates injection volume, and maintains consistent positioning across multiple injections. This multi-functionality reduces the time required for depth adjustment while ensuring precision.
4Adaptability or versatility
If the outlet tube is fixed in position, then the device structure is simple, but the penetration depth cannot be adjusted
Solution Approach 1:
The outlet tube transitions from a fixed position to a dynamically adjustable position within the sheath. The adjuster mechanism enables smooth movement between retracted and extended positions, providing adaptability for different penetration depths without significantly increasing device complexity.
Data Source
AI summary
An injection device for injecting a material into tissue may include a sheath having a distal end. The injection device may also include an injector having an outlet tube. The outlet tube may be received in the sheath, and may include a distal portion with a penetrating tip for penetrating the tissue. The sheath and the outlet tube may be slidable relative to each other, to extend a length of the distal portion from the distal end. The injection device may also include an adjuster operatively coupled to at least one of the sheath and the outlet tube. The adjuster may be configured to control relative movement between the sheath and the outlet tube for selectively adjusting the extended length.