A lead connector (100; 200; 300; 400; 500; 600; 700; 800; 1100; 1400; 1500; 1600; 1700; 1800; 1900) comprising: a base member (105; 335; 440; 635; 802; 1102; 1402; 1502; 1602; 1702; 1802; 1902); a flexible circuit (110; 230; 330; 435; 630; 715; 804; 1404; 1504; 1604; 1704; 1804; 1904) disposed on the base member and comprising a plurality of electrical contacts mounted on a circuit board; a plurality of rotatable contacts (215; 325; 405; 510; 610; 710; 818; 1410; 1510; 1610; 1710; 1810; 1910); a casing comprising a bottom casing (115; 220; 320; 425; 625) and a cover member (120; 205; 310; 420; 620; 806; 1104; 1406; 1606; 1706; 1806), wherein the bottom casing comprises an array of receptacles for the rotatable contacts at least partially open to and aligned with the contacts of the flexible circuit; wherein when a lead (305; 410; 505; 610; 705; 1110, 1120; 1410; 1914) is inserted into the lead connector via an opening (210; 320; 430; 515; 615; 808, 810; 1106; 1408; 1508) on the cover member, the lead pushes against the plurality of rotatable contacts, electrically coupling the lead to the flexible circuit via the plurality of rotatable contacts and the plurality of electrical contacts of the flexible circuit; characterised by comprising a plurality of contact housings (1712; 1812; 1912) mounted on the flexible circuit; the plurality of rotatable contacts (215; 325; 405; 510; 610; 710; 818; 1410; 1510; 1610; 1710; 1810; 1910) mounted at least partially within the plurality of contact housings (1712; 1812; 1912), wherein the plurality of contact housings (1712; 1812; 1912) are positioned to allow contact between a lead inserted into the lead connector and the plurality of rotatable contacts and between the plurality of rotatable contacts and the plurality of electrical contacts of the flexible circuit. a base member (105; 335; 440; 635; 802; 1102; 1402; 1502; 1602; 1702; 1802; 1902); a flexible circuit (110; 230; 330; 435; 630; 715; 804; 1404; 1504; 1604; 1704; 1804; 1904) disposed on the base member and comprising a plurality of electrical contacts mounted on a circuit board; a plurality of rotatable contacts (215; 325; 405; 510; 610; 710; 818; 1410; 1510; 1610; 1710; 1810; 1910); a casing comprising a bottom casing (115; 220; 320; 425; 625) and a cover member (120; 205; 310; 420; 620; 806; 1104; 1406; 1606; 1706; 1806), wherein the bottom casing comprises an array of receptacles for the rotatable contacts at least partially open to and aligned with the contacts of the flexible circuit; wherein when a lead (305; 410; 505; 610; 705; 1110, 1120; 1410; 1914) is inserted into the lead connector via an opening (210; 320; 430; 515; 615; 808, 810; 1106; 1408; 1508) on the cover member, the lead pushes against the plurality of rotatable contacts, electrically coupling the lead to the flexible circuit via the plurality of rotatable contacts and the plurality of electrical contacts of the flexible circuit; characterised by comprising a plurality of contact housings (1712; 1812; 1912) mounted on the flexible circuit; the plurality of rotatable contacts (215; 325; 405; 510; 610; 710; 818; 1410; 1510; 1610; 1710; 1810; 1910) mounted at least partially within the plurality of contact housings (1712; 1812; 1912), wherein the plurality of contact housings (1712; 1812; 1912) are positioned to allow contact between a lead inserted into the lead connector and the plurality of rotatable contacts and between the plurality of rotatable contacts and the plurality of electrical contacts of the flexible circuit.