Syringe Injection Control Device for Sealant Delivery
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Solution Overview
Problem
Current methods for delivering sealants during invasive medical procedures are imprecise and ineffective, leading to bleeding and complications such as pneumothorax due to manual handling of syringes, which results in inconsistent and inadequate sealing of tissue tracts.
Innovation Solution
An injection control device with a spiral cam gear assembly and plunger adjustment mechanism that allows for controlled and precise delivery of sealants by translating the syringe body relative to the plunger, ensuring consistent sealant distribution proportional to the withdrawal distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual syringe handling is used to deliver sealant, then the operator can perform the procedure with simple equipment, but the delivery precision and consistency of sealant distribution deteriorates
Solution Approach 1:
A mechanical intermediary system consisting of a syringe holder, plunger mechanism, and cam-follower linkage is introduced between the operator and the syringe. This intermediary automatically translates the withdrawal motion of the introducer/needle into controlled plunger movement, eliminating manual manipulation errors while maintaining procedural simplicity.
Solution Approach 2:
The delivery system performs self-service by automatically controlling sealant injection through the mechanical linkage between introducer withdrawal and plunger advancement. The system uses its own motion (withdrawal) to drive the injection mechanism, eliminating the need for separate manual syringe handling and achieving consistent delivery without complex external control.
2Productivity
If manual syringe injection is used during introducer withdrawal, then the procedure can be performed quickly, but the timing and amount of sealant delivery becomes inconsistent
Solution Approach 1:
The syringe is pre-loaded with the required amount of sealant and positioned in the syringe holder before the procedure begins. The mechanical linkage is pre-configured to translate the full withdrawal distance into the appropriate plunger movement, ensuring that the correct amount of sealant is delivered automatically as the introducer is withdrawn, without requiring real-time manual adjustment.
Solution Approach 2:
The mechanical linkage creates a direct feedback mechanism where the position and motion of the introducer/needle directly control the plunger position and injection rate. As the introducer withdraws from the tissue tract, the linkage automatically adjusts the plunger movement to match the changing volume of the tract, providing real-time feedback control for consistent sealant delivery throughout the withdrawal process.
3Stability of the object's composition
If the syringe is held stationary during introducer withdrawal, then the operator has stable control, but the sealant cannot be delivered proportionally to the withdrawal distance
Solution Approach 1:
The syringe system transitions from a static, manually-held configuration to a dynamic mechanically-linked configuration. The syringe holder and plunger mechanism are designed to move and adjust automatically in response to introducer withdrawal, transforming the stable but static manual hold into a controlled dynamic system that maintains proportional delivery throughout the motion sequence.
Solution Approach 2:
The system adds a new dimension of motion coupling by linking the longitudinal withdrawal motion of the introducer to the longitudinal injection motion of the plunger through the cam-follower mechanism. This dimensional coupling ensures that sealant delivery is proportional to withdrawal distance, converting a single-degree-of-freedom manual operation into a coordinated two-motion system.
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 device enhances precision in sealant delivery, reducing bleeding and complications by providing a controlled and proportional release of sealant, thereby improving the sealing of tissue tracts during invasive procedures.
Implementation Method 1
a spiral cam gear assembly interfaced with the rack of the base member and coupled to the chassis. The spiral cam assembly may comprise a spiral cam gear coupled to the rear chassis, the spiral cam gear comprising a plurality of circumferential teeth, a spiral cam recess, and a rotation axle, and a follower pin coupled to the front chassis and located in a spiral cam recess of the spiral cam gear
Implementation Method 2
The base member may comprise an elongate body and a rack, a chassis movably coupled to the base member... a spiral cam gear assembly interfaced with the rack of the base member
Data Source
AI summary
The present disclosure relates generally to methods and apparatus to control delivery of a sealant during an invasive procedure. Disclosed methods and apparatus control movement of a syringe to control injection of sealant stored therein. For example, disclosed methods and apparatus can displace the syringe body relative to the plunger as the syringe is withdrawn from the target site, rather than displacing the plunger relative to the syringe body, to thereby pressurize the sealant or inject the sealant in an amount proportional to a distance the syringe body is withdrawn. This reduces the variability in the amount of sealant delivered along the syringe withdrawal pathway. The disclosed methods and apparatus can increase precision in movement of a syringe, thereby increasing precision in sealant delivery.