Cannula Guide Wire Irrigation Orthopedic Bone
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Solution Overview
Problem
In orthopedic surgery, especially for osteoporotic bones, existing irrigation methods require removal and reinsertion of Kirschner-wires during implant fixation, complicating the process and reducing the effectiveness of bone cement penetration and implant fixation.
Innovation Solution
A cannula with a guide wire allows for precise control of liquid jet irrigation around the Kirschner-wire, enabling irrigation without wire removal, ensuring accurate implant positioning and controlled bone cement distribution for enhanced fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a hand-held pulsating fluid jet lavage device is used for irrigation, then bone surface preparation and cement penetration are improved, but the Kirschner-wire must be removed and reinserted, increasing procedure complexity and time
Solution Approach 1:
The cannula is designed to slide over the Kirschner-wire, with the through-channel accommodating the wire while maintaining irrigation functionality. This nesting arrangement allows the irrigation device to be integrated with the existing wire structure, eliminating the need for wire removal while preserving bone surface preparation quality
Solution Approach 2:
The cannula acts as an intermediary device that bridges the Kirschner-wire and the irrigation system. It allows liquid jet lavage to be delivered through the through-channel while the wire remains in place, mediating between the wire's positioning function and the irrigation's bone preparation function
2Reliability
If a small diameter cannula is used to irrigate around the Kirschner-wire, then the wire can remain in place, but the irrigation area coverage is limited and localization control is reduced
Solution Approach 1:
The cannula structure is segmented into multiple functional components: the through-channel for wire accommodation, the peripheral wall with multiple perforations for distributed irrigation, and the contraction zone for precise localization. This segmentation allows the device to maintain wire stability while achieving comprehensive bone surface coverage through multiple spray points
Solution Approach 2:
The irrigation function is extended from a single-point spray to a three-dimensional distribution pattern through multiple perforations arranged on the peripheral wall. This dimensional expansion allows comprehensive coverage of the bone surface surrounding the wire while the cannula itself maintains a compact diameter for wire compatibility
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 solution allows for precise irrigation and cement distribution, improving implant fixation and reducing complications by maintaining the Kirschner-wire in place during the irrigation process, enhancing the penetration depth of bone cement and stability of the implant.
Implementation Method 1
a pressurized liquid jet lavage for a bone surface preparation
Implementation Method 2
irrigation of the bone structure surrounding the implant
Data Source
AI summary
A cannula (1) comprising a central axis (2), a front end (3) and a through channel (5) coaxial or parallel to said central axis (2) and defining a peripheral wall (12) of said cannula (1), wherein A) said cannula (1) further comprises at least two perforations (8) penetrating said peripheral wall (12) transversely to said central axis (2); B) said through channel (5) is open at said front end (3); and C) the cross section of said through channel (5) has a contraction (6) with a diameter di located between the front most of said at least two perforations (8) and said front end (3) which is formed as a guidance for a wire (7). A device (10) for liquid jet irrigation of bone comprising such a cannula (1) and a wire (7).