Autologous Mitochondrial Transfer in ICSI to Improve Oocyte and Embryo Quality in IVF Patients. Pilot Study

Inclusion Criteria: * The patients must have read, understood and signed the ICF. * Age ≤ 42 years. * Serum AMH ≥ 4 pM/L. * Previous IVF cycle with 5 or more metaphase II oocytes after retrieval * BMI \< 30. * Will undergo an IVF cycle with arrays in Preimplantation Genetic Screening. * Semen sample with concentrations exceeding 3 million/mL progressive motile sperm. Present with a history of at least one previous cycle of IVF with embryo transfer and no pregnancy due to low embryo quality. Low embryo quality is understood as \> 70% of the embryos obtained being included in the worst prognosis category according to any of the following criteria: 1. Low or abnormal Fertilization Rate despite semen count \> 3 million/mL. 2. Deficient quality embryos according to morphological criteria established by ASEBIR: i. Embryo D2 and D3: classified as Type C or Type D according to ASEBIR criteria. ii. Embryo D5 or blastocyst: Inner cell mass absent, with few cells and difficult differentiation, Trophectoderm with very few cells. Type C or D of ASEBIR. 3. Embryos of deficient quality according to morphokinetic criteria established (28) for EmbryoScope Time-Lapse if this incubator has been used. i.Category 4: Embryos of 1 or 2 pronuclei (PN) formed from 1 to 2 cells at 27h, from 2 to 6 cells on D2 and 4 or \>8 cells or morula on D3. The embryo can present with asymmetrical and multinucleated blastomeres. Degree of fragmentation \< 50%. ii. Category 5: Embryo with any number of cells at 27h, on D2 and D3. Asymmetrical, multinucleated blastomeres and any degree of fragmentation. Atretic embryos and those with arrested embryo development belong to this category. 4. All cases without embryo transfer due to any chromosomal abnormality detected through PGD or PGS techniques. 5. All cases without transfer due to the presence of embryos that present a blockage of embryo development before D3. If the morphological quality criteria established under points 2, 3 and 4 give contradictory results, the result obtained through PGD/PGS (point 4) will prevail over the morphokinetic parameters (point 3) and this, in turn, will prevail over the classic morphological criteria (point 2). Exclusion Criteria: * Formal contraindication for ovarian cortex biopsy or follicle puncture. * Severe male factor (concentration\<3 million/mL of progressive motile sperm). * Any characteristic incompatible with carrying out a new IVF cycle at IVI Valencia.