Spinous Process Fixation Device with Microporous Bone Fusion
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Solution Overview
Problem
Current internal fixation methods for spinal surgery, such as pedicle screws and intervertebral bone fusion structures, face challenges like large exposure ranges, significant soft tissue injury, nerve and blood vessel compression, and complex surgical paths, which increase surgical risk and complications.
Innovation Solution
An internal fixation device comprising a rigid skeleton body and a bone fusion structure, where the bone fusion structure is embedded and fixed within the rigid skeleton body, and includes a microporous structure for bone growth promotion, with medicine inlets and outlets for facilitating bone fusion and reconstruction of spinous processes and vertebral laminae.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pedicle screws are used for internal fixation, then fixation strength is improved, but exposure range increases and soft tissue injury worsens
Solution Approach 1:
The invention extracts the fixation function from deep pedicle screw insertion and relocates it to the superficial spinous process and vertebral lamina. The fixation device is applied at the posterior element level rather than requiring pedicle penetration, thereby reducing exposure range and soft tissue injury while maintaining fixation capability.
2Strength
If pedicle screws are used for internal fixation, then fixation strength is improved, but nerve and blood vessel compression risks increase
Solution Approach 1:
The invention removes the fixation device from the deep pedicle region where nerves and vessels are at risk, and relocates it to the safer posterior element level. This extraction approach eliminates direct compression risks to neural and vascular structures while preserving the essential fixation function.
3Reliability
If intervertebral bone fusion structures are used, then bone fusion is promoted, but surgical path complexity increases and surgical risk increases
Solution Approach 1:
Instead of approaching bone fusion from the complex intervertebral disc path (anterior, lateral, or posterior), the invention inverts the approach by utilizing the spinous process and vertebral lamina as the primary fixation and fusion site. This reverses the conventional wisdom and simplifies the surgical path while maintaining bone fusion capability.
4Object-affected harmful factors
If spinous process and vertebral lamina are removed for decompression, then neural canal decompression is achieved, but nerve scar adhesion increases and nerve protection decreases
Solution Approach 1:
The invention recovers the removed spinous process and vertebral lamina by using them as the basis for fixation and fusion. Rather than permanently discarding these structures after decompression, the device utilizes them to reconstruct protective coverage over the neural elements, thereby eliminating scar adhesion risks and restoring nerve protection.
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 device allows for small exposure range, easy operation, and low surgical risk, while promoting bone fusion and reconstruction, reducing the risk of device collapse and nerve injury, and facilitating the absorption of bone-promoting substances.
Implementation Method 1
a microporous structure is provided inside the bone fusion structure, and an orifice of the microporous structure is located on a side surface of the bone fusion structure
Data Source
AI summary
An internal fixation device for fusion and reconstruction of spinous processes and vertebral laminae, which includes a bone fusion structure and a rigid skeleton body, the rigid skeleton body includes a first rigid plate and a second rigid plate, the bone fusion structure is located between two rigid plates. The bone fusion structure is a microporous structure with a storage channel inside for storing bone growth promoting substances, front and back sides of the bone fusion structure have a medicine inlet and a medicine outlet, the medicine outlet is docked with anterior and posterior spinous processes, facilitating bone fusion of a cross-section position of the spinous processes. The two rigid plates are extended outward and downward to form the lamina fixation part, covering and reconstructing the vertebral laminae, and the two rigid plates are fixedly connected to the anterior and posterior spinous processes and the vertebral laminae by screws.