Spherical Bone Granules with Rough Porous Shell
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Solution Overview
Problem
The production of spherical granules for bone regeneration is challenging due to high-temperature processing, which alters the crystal structure of ceramic materials, resulting in smooth surfaces unfavorable for cell attachment and proliferation.
Innovation Solution
The development of a method to create spherical granules at low temperatures (<150°C) using ceramic powders, with an outer shell of magnesium phosphate and nano-sized silica, and a bioactive core, incorporating macro- and micro-pores to enhance cell attachment and bone formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-temperature heating process is used to form spherical granules, then granule formation and mechanical strength are improved, but crystal structure alteration and smooth surface formation occur which are unfavorable for cell attachment
Solution Approach 1:
The patent applies parameter changes by reducing the heating temperature from conventional high temperatures (1000°C) to low temperatures (below 150°C). This fundamental parameter change allows the formation of spherical granules with rough, porous surfaces that favor cell attachment, while avoiding the harmful effects of high-temperature processing such as crystal structure alteration and excessive smoothness.
Solution Approach 2:
The patent uses composite materials by combining ceramic powders with magnesium phosphate and nano-sized silica to form an outer shell with a bioactive core. This composite structure enables the granules to achieve both mechanical strength and enhanced bioactivity with rough, porous surfaces that promote cell attachment and proliferation without requiring high-temperature processing.
2Shape
If high-temperature heating is applied to create spherical granules, then particle fusion and granule formation are achieved, but intragranular pores are eliminated resulting in smooth surfaces
Solution Approach 1:
The patent fundamentally changes the temperature parameter from high-temperature processing to low-temperature processing (below 150°C). This parameter change allows spherical granule formation through alternative mechanisms that do not involve high-temperature fusion, thereby preserving intragranular pores and creating rough surfaces favorable for cell attachment.
Solution Approach 2:
The patent intentionally creates porous materials by forming an outer shell containing magnesium phosphate and nano-sized silica with incorporated micro-pores and macro-pores. This porous structure is maintained through low-temperature processing, resulting in rough surfaces with high surface area that enhance cell attachment and proliferation while achieving spherical granule formation.
3Ease of manufacture
If conventional ceramic processing methods are used, then granule formation is achieved, but additional measures are required to enhance bioactivity
Solution Approach 1:
The patent uses composite materials to enhance bioactivity by incorporating magnesium phosphate and nano-sized silica in the outer shell with a bioactive core. This composite structure inherently provides the desired rough, porous surface morphology and biochemical cues for cell attachment, eliminating the need for additional post-processing measures to enhance bioactivity.
Solution Approach 2:
The patent applies local quality by creating a differentiated structure with an outer shell containing magnesium phosphate and nano-sized silica with specific porous characteristics, and a bioactive core. This local differentiation of material properties within the granule structure provides enhanced bioactivity and cell attachment capabilities without requiring complex additional processing steps.
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 resulting granules facilitate faster bone healing by providing a rough surface and porous structure that encourages cell proliferation and bone tissue infiltration, improving the efficiency of bone regeneration.
Implementation Method 1
The outer shell can include magnesium phosphate and silica
Implementation Method 2
rotating the mixture with dual asymmetric centrifugation for a predetermined amount of time
Implementation Method 3
drying the resulting material
Data Source
AI summary
A composition for bone regeneration includes substantially spherical granules. Each of the spherical granules include an outer shell including magnesium phosphate and nano-sized silica and a bioactive core encapsulated by the outer shell. The granules include macro-pores and micro-pores. The macro-pores are intergranular spaces between adjacent granules, and the micro-pores are intragranular nanopores formed on the outer shell of each of the granules. A method of producing the substantially spherical granules, includes providing a mixture of a biological active powder, magnesium phosphate, and an initiator with a colloidal silica solution; rotating the mixture with dual asymmetric centrifugation for a predetermined amount of time; and drying the resulting material.