Post-market Evaluation of HEMOBLAST™ Bellows in Spine Surgery

Pre-operative Inclusion Criteria: * Patient is undergoing a non-emergent spine surgery * Patient is willing and able to give prior written informed consent for investigation participation; * Patient is 18 years of age or older. Intra-operative Inclusion Criteria * Patient has one or more target bleeding sites (TBS) for which control of bleeding by conventional procedures is ineffective or impractical. * The TBS(s) has been treated with HEMOBLAST™ Bellows per instructions for use. Exclusion Criteria: * Patient is pregnant, planning on becoming pregnant during the follow-up period, or actively breast-feeding; * Patient has a known sensitivity or allergy to bovine and/or porcine substance(s) or any other component(s) of the hemostatic agent; * Patient has religious or other objections to porcine, bovine, or human components; * Patient has any other contraindications, warnings, precautions of the Approved Instruction For Use of HEMOBLAST™ Bellows preventing his/ her inclusion * Patient is not appropriate for inclusion in the clinical trial, per the medical opinion of the Investigator