 He is credited with improving the birth forceps by adding a "pelvic curve" to the instrument.A classical procedure for assisted breech delivery is sometimes referred to as a "Mauriceau-Levret manipulation", named after Levret and physician François Mauriceau (1637–1709).This procedure is also known as "Lachapelle’s manoeuvre", named after midwife Marie-Louise Lachapelle (1769–1821).