Intraosseous Catheter Depth Control With Guided Trocar Advancement
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Solution Overview
Problem
Existing intraosseous devices struggle to accurately place the distal tip of an intraosseous catheter within the intraosseous region of a bone for rapid infusion of medicaments, lacking the ability to insert the catheter to a predetermined depth and ensuring secure placement.
Innovation Solution
An intraosseous access device with a trocar needle and advancement mechanism, such as an internal spring or drill, allows for manual or controlled insertion of the catheter to a desired depth within the bone, featuring a safety switch and adjustable depth settings to ensure precise placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing intraosseous devices are used, then the catheter can be inserted into the bone, but the distal tip cannot be accurately placed at a predetermined depth within the intraosseous region
Solution Approach 1:
The device incorporates a trocar needle with a predetermined length that extends beyond the catheter when both are disposed on the trocar. This preliminary configuration ensures that when the trocar is inserted to a specific depth, the catheter tip will be positioned at the desired predetermined depth within the bone, eliminating the need for complex depth measurement mechanisms during insertion.
Solution Approach 2:
The trocar needle serves as an intermediary tool that facilitates accurate catheter placement. By inserting the trocar to a predetermined depth and then advancing the catheter over the trocar, the system uses the trocar as a guide to achieve precise tip positioning without requiring complex direct measurement mechanisms on the catheter itself.
2Manufacturing precision
If manual insertion without advancement mechanism is used, then device complexity is reduced, but the catheter cannot be advanced to a predetermined depth after initial insertion
Solution Approach 1:
The device employs an advancement mechanism that transforms the static catheter-trocar assembly into a dynamic system. The mechanism allows the catheter to be selectively advanced relative to the trocar after initial bone insertion, enabling controlled adjustment of the catheter tip depth to reach the predetermined target position within the intraosseous region.
Solution Approach 2:
The insertion process is divided into distinct phases: initial trocar insertion to bone surface, followed by selective advancement of the catheter over the trocar using the advancement mechanism. This segmentation allows for controlled, staged insertion where depth precision is achieved through the mechanical advantage of the advancement mechanism rather than requiring complex integrated systems.
3Productivity
If the trocar needle is inserted deeply to reach bone marrow, then rapid medicament infusion is enabled, but inadvertent needle sticks to the user may occur
Solution Approach 1:
The trocar needle is extracted from the catheter assembly after the catheter is advanced over it and secured in place. This separation removes the sharp, hazardous trocar from the patient's body while leaving the softer catheter in position for medicament infusion, thereby eliminating the ongoing needle stick hazard while maintaining rapid infusion capability.
Solution Approach 2:
The trocar needle is designed as a disposable, single-use component that is inserted deeply to facilitate catheter placement but is then discarded. This allows the system to achieve the necessary deep insertion for rapid infusion without requiring the long-term presence of a sharp needle, thereby reducing the risk of inadvertent needle sticks during and after the procedure.
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
Enables accurate and controlled insertion of the catheter tip into the bone marrow, facilitating rapid infusion of medicaments and preventing inadvertent needle sticks through telescoping protection mechanisms.
Implementation Method 1
an internal spring configured to distally advance the intraosseous catheter into the bone marrow
Data Source
AI summary
An intraosseous access device can include a device body, a trocar needle coupled to the device body, and an intraosseous catheter removably disposed on the trocar needle. The device body can be configured to enable manual insertion of a distal tip of the trocar needle through a skin surface of a patient to an external surface of a bone of the patient. The intraosseous catheter can include a catheter hub and a cannula slidable with respect to the catheter hub to enable adjustment of a longitudinal length of the intraosseous catheter. The intraosseous access device can further include an advancement mechanism configured to advance the trocar needle and the intraosseous catheter into an internal portion of the bone after the distal tip of the trocar needle and the intraosseous catheter have been inserted through the skin surface of the patient to the external surface of the bone of the patient.