Cannulated Bone Anchor Structure for Cement Leakage Control
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Solution Overview
Problem
Existing bone anchors face challenges in achieving sufficient anchorage stability in osteoporotic bones due to insufficient bone quality, and minimally invasive designs risk bone cement leakage during fixation, necessitating additional components and complex handling to prevent leakage.
Innovation Solution
A one-piece bone anchor with a central cannulation opening and lateral openings, featuring a fluidic diode mechanism that minimizes bone cement leakage by controlling flow direction and pressure, utilizing additive manufacturing for a unified design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a through-hole cannulation opening is used to enable minimally invasive insertion with guide wire, then minimally invasive use is enabled, but bone cement can spread outside the bone causing serious complications
Solution Approach 1:
The cannulation opening is divided into two separate openings: a proximal cannulation opening for guide wire insertion and a distal cannulation opening for cement injection. This segmentation allows the guide wire to pass through while preventing cement from escaping through the same path, thus enabling minimally invasive insertion without cement leakage complications
Solution Approach 2:
A distal plug is introduced as an intermediary component to close the distal cannulation opening after cement injection. This plug acts as a mediator that prevents cement from spreading outside the bone while allowing the minimally invasive approach to be maintained during the procedure
2Object-generated harmful factors
If a mini-plug is used to close the distal opening and prevent cement leakage, then cement leakage is prevented, but an extra component must be kept in stock and handling must provide sufficient safety against accidental loss
Solution Approach 1:
The distal plug is merged with the bone anchor body to form a single integrated component. This merging eliminates the need for separate mini-plugs to be stored and handled, reducing device complexity while maintaining the ability to prevent cement leakage through the integrated plug structure
3Strength
If bone cement is injected through the bone anchor to enhance anchorage stability in osteoporotic bones, then anchorage stability is improved, but cement can spread outside the bone during bicortical screw fixation
Solution Approach 1:
The bone anchor features locally differentiated opening structures: a proximal opening for cement injection and a distal plug for cement containment. This local quality differentiation ensures that cement is delivered to the bone to enhance anchorage stability while preventing spread outside the bone through the strategically positioned distal plug
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
Enhances anchorage stability in osteoporotic bones while preventing bone cement leakage, ensuring secure fixation and reducing the risk of complications through a unified, minimally invasive procedure.
Implementation Method 1
a fluidic diode transition area (20) which prevents the liquid (17) from flowing back through the cannulation opening (15, 16, 40, 20)
Data Source
AI summary
A bone anchor for the fixation of bone components and bone fragments is disclosed including a shaft, a neck area and a head located in proximal direction, and a tip located in distal direction, the bone anchor having a substantially cylindrically shaped hollow chamber extending along the central axis, the hollow chamber being adjacent to a transition area located distally from a central plane. The transition area is located distally from the central plane, that the transition area has at least in sections an inner diameter and the hollow chamber has at least in sections an opening diameter, and the opening diameter of the hollow chamber is larger than the inner diameter of the distal transition area.