Biphasic Ceramic Bone Substitute for Osteoporotic Fracture Fixation
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Solution Overview
Problem
Current methods for treating osteoporosis and bone-related conditions face challenges such as inadequate bone anchorage in fragile bones, high failure rates of fracture fixation devices, and increased risk of infection due to insufficient bone quality and antibiotic delivery in orthopedic surgeries, particularly in osteoporotic patients.
Innovation Solution
A method involving the use of a biphasic or triphasic ceramic material, such as hydroxyapatite combined with calcium sulphate, which is finely divided into nanoparticles for enhanced surface area, allowing for the controlled release of pharmaceutical compounds like zoledronic acid and antibiotics, promoting bone formation and infection prevention by chemotactic attraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional fracture fixation devices are used in osteoporotic bone, then surgical intervention can be performed, but anchorage strength and fixation reliability are insufficient due to fragile cancellous bone
Solution Approach 1:
The patent applies composite materials by combining hydroxyapatite ceramic particles with calcium sulfate to create a biphasic bone substitute material. The hydroxyapatite provides long-term structural support and bone conduction, while the calcium sulfate provides initial mechanical strength and rapid resorption. This composite approach resolves the contradiction by providing both immediate anchorage strength for fixation devices and long-term reliability through progressive bone regeneration.
Solution Approach 2:
The patent utilizes porous materials by creating a porous structure in the bone substitute material that mimics natural cancellous bone architecture. This porous structure allows for bone ingrowth, vascularization, and provides mechanical interlocking for fixation devices, thereby improving both anchorage strength and fixation reliability in osteoporotic bone without requiring dense solid material.
2Ease of operation
If internal fixation methods are used for femur fractures, then surgical treatment can be provided, but failure rate increases due to loss of fixation in poor quality cancellous bone
Solution Approach 1:
The patent applies preliminary action by administering the biphasic bone substitute material to the fracture site before inserting fixation devices. This pre-treatment creates a reinforced bone matrix that provides immediate structural support and improves the quality of cancellous bone, enabling successful fixation device insertion and reducing the risk of subsequent fixation failure in osteoporotic bone.
Solution Approach 2:
The patent uses the biphasic bone substitute material as an intermediary between the fixation devices and the poor quality cancellous bone. This intermediary material provides a transition zone that transfers and distributes mechanical loads, protecting the fixation devices from direct stress on fragile bone and preventing loss of fixation.
3Quantity of substance
If antibiotics are administered systemically for infection prevention, then broad coverage is achieved, but local concentration at the surgical site is insufficient to prevent osteomyelitis
Solution Approach 1:
The patent employs the bone substitute material as an intermediary carrier for antibiotics. The material is pre-loaded with antibiotics, creating a local reservoir that provides sustained high-concentration antibiotic delivery directly at the surgical site. This intermediary approach overcomes the limitation of systemic administration by concentrating the antibiotic exactly where needed to prevent osteomyelitis.
Solution Approach 2:
The patent utilizes the porous structure of the bone substitute material to load and release antibiotics. The porous network provides high surface area for antibiotic adsorption and enables controlled release kinetics, maintaining therapeutic antibiotic concentrations at the implant site over an extended period to effectively prevent infection.
4Reliability
If ceramic material is used for bone substitution, then bone conduction and formation are promoted, but material delivery precision and uniformity are challenging
Solution Approach 1:
The patent applies pneumatic and hydraulic principles by formulating the biphasic bone substitute material as a flowable slurry that can be delivered through catheters and delivery devices. The slurry formulation allows for precise delivery to targeted bone defects using minimally invasive techniques, achieving uniform distribution of ceramic particles while maintaining bone formation effectiveness.
Solution Approach 2:
The patent utilizes parameter changes by controlling the physical state of the bone substitute material. The material is processed and delivered as a flowable slurry with specific viscosity and particle size distribution, then transforms into a solid structured matrix in situ. This parameter transformation enables precise delivery while ensuring effective bone conduction and formation.
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 approach significantly enhances bone formation and anchorage strength, reduces the risk of implant failure, and effectively delivers antibiotics to prevent infections by utilizing the ceramic material's affinity for pharmaceutical agents, leading to improved surgical outcomes and reduced complications.
Implementation Method 1
The material's affinity for pharmaceutical agents, leading to improved surgical outcomes
Data Source
AI summary
A method for bone healing or treatment of bone fracture in a subject includes optionally pre-drilling a hole or creating a cavity in a body tissue, implanting a device onto or into the body tissue, or at least partially inserting a device into the cavity or hole, administering a composition into the device and/or near the device. The composition includes a first finely divided particulate material, and can optionally include at least a second material. The first material is not bioresorbable or is very slowly bioresorbable and the second material or materials are bioresorbable at a higher rate than the first material. The method can optionally include fully inserting the device into the hole or cavity, and can optionally include administering a pharmaceutical composition to the subject.