A method of providing an interspinous spacer between adjacent spinous processes includes: (a) providing a spacer that is configurable to a collapsed configuration and to an expanded configuration, where the collapsed configuration presents an implantation profile that is at least 10% smaller than the corresponding profile when the spacer is in its expanded configuration; (b) causing the spacer to assume its collapsed configuration; (c) introducing the spacer into a medical patient while the spacer is in its collapsed configuration; and (d) allowing the spacer to assume its expanded configuration while positioned between adjacent spinous processes in a medical patient.

 
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> Artificial expansile total lumbar and thoracic discs for posterior placement without supplemental instrumentation and its adaptation for anterior placement of artificial cervical, thoracic and lumbar discs

> Crossbar spinal prosthesis having a modular design and related implantation methods
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