Vertebroplasty Needle Vibration Assembly Reduces Injection Pressure

The patent applies mechanical vibration through a vibration assembly that generates ultrasonic or high-frequency vibrations. This vibration is transmitted to the bone cement material, reducing its viscosity and improving its flow characteristics. As a result, the cement can be injected at lower pressures while still achieving effective filling of the vertebral body, thereby resolving the contradiction between filling efficiency and extravasation risk.

The patent changes the physical parameters of the bone cement by applying vibration energy. The vibration alters the rheological properties of the cement, temporarily reducing its viscosity during injection. This parameter change allows the cement to flow more easily through the needle at reduced pressure, yet still achieve complete vertebral body filling, thus resolving the pressure-related contradiction.

The vibration assembly generates high-frequency mechanical vibrations that are transmitted through the needle during insertion. These vibrations reduce friction between the needle and bone tissue, allowing the needle to penetrate the cortical bone with significantly reduced applied force. This prevents cortical fractures and reduces the risk of cement leakage, while still enabling successful needle placement in the vertebral body.

The patent replaces pure mechanical force-based insertion with a combined system that uses vibration energy. Instead of relying solely on high force to penetrate the cortex, the system uses vibrational energy to facilitate needle passage. This substitution reduces the mechanical stress on the cortical bone, preventing fractures while maintaining insertion capability.

The vibration assembly reduces the viscosity of the bone cement through high-frequency vibrations, transforming it into a more fluid state during injection. This allows the cement to flow rapidly through the needle and fill the vertebral body completely at low pressure. The reduced pressure prevents epidural venous filling and spinal cord compression, while the vibration-enabled flow maintains high filling speed, resolving the contradiction between productivity and safety.

The patent utilizes a temporary phase or state transition of the bone cement material. The vibration energy induces a transient change in the cement's rheological state, making it more fluid and easier to inject. Once injection is complete, the cement returns to its normal state and sets in the vertebral body. This phase transition allows rapid filling at low pressure, preventing harmful effects while maintaining productivity.