MUMBAI, India, Aug. 17 -- Intellectual Property India has published a patent application (202641095363 A) filed by Indian Institute Of Technology Madras Iit Madras on August 06, 2026, for Hybrid Porous Spinal Fusion Implant With Spatially Arranged Auxetic And Non-Auxetic Lattice Regions.
Inventors include Rengaswamy Jayaganthan; and Parameswaran Palaniyandi.
The application for the patent was published on August 14, 2026, under issue no. 33/2026.
Abstract: HYBRID POROUS SPINAL FUSION IMPLANT WITH SPATIALLY ARRANGED AUXETIC AND NON-AUXETIC LATTICE REGIONS A spinal fusion implant may include an upper bone-contacting structure, a lower bone-contacting structure, and a porous implant body extending between the bone-contacting structures. The porous implant body may include a central auxetic lattice region positioned between upper and lower non-auxetic lattice regions. The central auxetic lattice region may include modified cubic re-entrant unit cells having axial members interconnected by inwardly directed inclined members. At least one interface between adjacent lattice regions may have an aligned, partially aligned, staggered, or offset spatial arrangement that establishes selected continuous or distributed load- transfer pathways. Optional intermediate support structures may position adjacent lattice regions, may have graded thickness or porosity, and may receive terminal lattice-member portions to form an integral interlock. The spinal fusion implant may further include a graft passage, fixation-enhancing bone-contacting formations, graded lattice parameters, and patient-specific geometry, and may be integrally formed by additive manufacturing.
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