Decellularized Bovine Bone Graft Processing
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Solution Overview
Problem
Current decellularization methods for bovine bone grafts, such as using Sodium dodecyl sulfate (SDS), may leave residual DNA and RNA, leading to chronic inflammatory responses, and lack complete removal of cellular debris, necessitating a more effective method to ensure biocompatibility and immunocompatibility.
Innovation Solution
A novel decellularization process involving sequential washing with distilled water, alcohol-chloroform, sodium hypochlorite, sodium dodecyl sulfate, DNase, and RNase treatments, followed by lyophilization and gamma radiation, to achieve complete removal of cellular material while preserving the bone's structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Sodium dodecyl sulfate (SDS) is used for decellularization, then complete cell removal and DNA elimination are achieved, but residual DNA and RNA remain causing chronic inflammatory responses
Solution Approach 1:
The patent combines multiple decellularization methods into a sequential protocol: mechanical washing, chemical treatment with SDS, enzymatic treatment with DNase and RNase, and repeated washing steps. This combination allows complete cell removal while eliminating residual nucleic acids that cause inflammation, achieving both reliability and biocompatibility
Solution Approach 2:
The patent employs multiple sequential washing steps and repeated treatment cycles to continuously remove cellular debris and residual DNA/RNA. The process includes initial washing, SDS treatment, enzymatic digestion, and multiple rinsing steps to ensure complete elimination of harmful substances while preserving bone structure
2Reliability
If chemical and enzymatic methods are used for decellularization, then cellular material is removed, but tissue structure may be damaged
Solution Approach 1:
The patent divides the decellularization process into distinct sequential steps: mechanical washing to remove loose debris, chemical treatment with SDS to dissolve cell membranes, enzymatic treatment with DNase and RNase to digest nucleic acids, and repeated washing. Each step targets specific cellular components, allowing complete removal while minimizing cumulative damage to the bone matrix
Solution Approach 2:
The patent optimizes treatment parameters including SDS concentration (0.01-1%), enzyme concentration and incubation time, and washing frequency. By controlling these parameters, the process achieves effective decellularization while preserving the structural integrity and porosity of the bone tissue
3Object-generated harmful factors
If surfactants are used to solubilize cell membranes, then biocompatibility is improved, but complete removal of cellular debris is not achieved
Solution Approach 1:
The patent combines surfactant-based chemical treatment (SDS) with enzymatic treatment (DNase and RNase) in a sequential protocol. The SDS step solubilizes cell membranes and releases cellular contents, while the enzymatic step completely degrades residual DNA and RNA, achieving both biocompatibility and complete debris removal
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
The process effectively reduces DNA and RNA content, enhances biocompatibility, and supports osteoblast growth and mineralization, reducing the risk of inflammatory responses and improving the quality of bone grafts for surgical applications.
Implementation Method 1
immersing the cancellous bone body in a mixture of alcohol-chloroform at a 1:1 ratio for approximately 24 hr
Implementation Method 2
deproteinizing the cancellous bone body in approximately 4% sodium hypochlorite for a time range of approximately 18 to 30 hr
Implementation Method 3
washing the cancellous bone body sequentially in 0.01, 0.1, and 1% sodium dodecyl sulfate for approximately 72 hr
Implementation Method 4
treating the cancellous bone body with DNase and RNase for approximately a week
Implementation Method 5
cryopreserving the decellularized cancellous bone block; lyophilizing the decellularized cancellous bone body
Implementation Method 6
sterilizing the decellularized cancellous bone body utilizing gamma radiation
Data Source
AI summary
Novel process for decellularization of bovine bone graft for reconstruction of bone defects.