Central Venous Catheter Positioning with Conductance-Based Tip Detection
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Solution Overview
Problem
Current methods for placing central venous catheters (CVCs), such as PICC lines, are time-consuming, costly, and often inaccurate due to reliance on fluoroscopic guidance, which may not be feasible in all situations and can be inaccurate due to the two-dimensional projection of a three-dimensional object.
Innovation Solution
The use of a conductance guidewire (CGW) system that generates an electric field and obtains multiple conductance measurements as the guidewire is advanced through the patient's vasculature, providing real-time feedback for accurate placement of CVCs without the need for x-ray guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluoroscopic guidance is used for CVC placement, then placement accuracy can be improved, but procedural time and cost increase
Solution Approach 1:
The patent replaces the mechanical/optical fluoroscopic guidance system with an electrical measurement system. A sensor at the catheter tip detects electrical impedance changes in the vasculature to determine tip location, substituting the need for continuous fluoroscopic imaging and eliminating the associated time delays and radiation exposure while maintaining placement accuracy.
Solution Approach 2:
The patent creates an electrical map of the vasculature by measuring impedance at multiple locations along the catheter. This electrical representation serves as a substitute for the visual fluoroscopic image, allowing clinicians to determine catheter tip position through electrical measurements rather than requiring repeated fluoroscopic shots, thereby reducing procedural time.
2Measurement precision
If fluoroscopic guidance is used for CVC placement, then placement accuracy can be improved, but procedural cost increases
Solution Approach 1:
The patent substitutes expensive fluoroscopic equipment and associated operational costs with a simpler electrical impedance measurement system. The sensor-based electrical mapping approach uses standard medical electrical measurement equipment rather than costly fluoroscopy suites, significantly reducing procedural costs while maintaining placement precision.
Solution Approach 2:
The patent employs a disposable sensor array or sensing catheter that performs the electrical mapping function. This single-use component eliminates the need for expensive, reusable fluoroscopic equipment and reduces the cost per procedure, making accurate placement accessible in lower-resource settings.
3Measurement precision
If x-ray confirmation is used for CVC placement, then placement accuracy can be improved, but the method becomes unfeasible in certain situations
Solution Approach 1:
The patent replaces the radiation-dependent x-ray confirmation system with an electrical impedance-based system that does not require radiation safety infrastructure. This electrical mapping approach can be performed in any setting with basic electrical measurement equipment, including home care, emergency departments, and clinics without fluoroscopy capability, vastly improving adaptability while maintaining placement accuracy.
4Ease of operation
If traditional feel-based placement is used, then procedural simplicity is maintained, but placement accuracy deteriorates
Solution Approach 1:
The patent provides real-time feedback to the clinician through electrical impedance measurements. As the catheter is advanced, the sensor continuously monitors impedance changes that indicate proximity to target vessels or anatomical landmarks, giving the operator objective guidance rather than relying solely on subjective tactile sensation, thereby improving placement accuracy without significantly increasing procedural complexity.
Solution Approach 2:
The patent introduces an electrical impedance measurement intermediary between the operator and the catheter tip. This intermediary provides objective data about catheter position and surrounding anatomy, translating physical position into measurable electrical signals that guide placement, bridging the gap between simple manual advancement and complex imaging guidance.
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
This method allows for accurate and efficient placement of CVCs, reducing procedural time and cost, and improving patient safety by minimizing the risk of complications associated with improper placement.
Implementation Method 1
the detector comprising a pair of detection electrodes positioned in between a pair of excitation electrodes, the detector is configured to generate an electric field and also to obtain multiple conductance measurements within the electric field
Implementation Method 2
obtain multiple conductance measurements within the electric field as the detector is advanced through a patient's vasculature, wherein each of the multiple conductance measurements is indicative of a location of the detector within the patient's vasculature
Data Source
AI summary
Systems and methods for navigation and positioning a central venous catheter within a patient. The system may include a first pole and a second pole designed to generate an electric field sufficient to obtain a plurality of field measurements. The system may include a stylet inserted into a medical device. The stylet may include a magnetic assembly configured to produce a magnetic field positioned along a distal portion of the stylet, and a stylet electrode positioned distal of the magnetic assembly. The stylet electrode may be designed to function as both an interior excitation electrode and an interior detection electrode. Advancement of the medical device in the patient may include using a conductance curve generated from the plurality of field measurements to identify an obstruction or malposition in the patient.