正海生物：公司的产品可吸收硬脑（脊）膜补片、硬脑（脊）膜补片主要应用于神经外科

Group 1 - The company, Zhenghai Biological, confirmed that its products, including absorbable dura mater (spinal) patches, are primarily used in neurosurgery for the repair of dura mater (spinal) defects caused by various reasons [2] - The company's dura mater series products are not specifically mentioned to be applicable in brain engineering, but they are designed for medical applications related to the nervous system [2] - The interaction took place on an investor communication platform, indicating active engagement with investors regarding product applications [2]