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An obturator assembly having a removable obturator tip, a first engagement device, an obturator shaft, a second engagement device, and a biased flexible member, whereby the obturator tip may be removed by flexing the flexible member against its bias, and a plurality of different obturator tips may b

An obturator assembly having a removable obturator tip, a first engagement device, an obturator shaft, a second engagement device, and a biased flexible member, whereby the obturator tip may be removed by flexing the flexible member against its bias, and a plurality of different obturator tips may be attached to the obturator shaft.

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An obturator assembly having a removable obturator tip, a first engagement device, an obturator shaft, a second engagement device, and a biased flexible member, whereby the obturator tip may be removed by flexing the flexible member against its bias, and a plurality of different obturator tips may b

An obturator assembly having a removable obturator tip, a first engagement device, an obturator shaft, a second engagement device, and a biased flexible member, whereby the obturator tip may be removed by flexing the flexible member against its bias, and a plurality of different obturator tips may be attached to the obturator shaft. tion in which the puncture tip of the needle cannula is exposed and a blunted configuration in which the blunt end of the blunting probe blunts the needle assembly; wherein one of the shuttle and housing comprises a movable detent, and the other comprises a stay, the detent being movable between a locking position in which it may bear against the stay and prevent the needle assembly from moving to the sharpened configuration and an unlocked position which permits the needle assembly to move to the sharpened configuration. 6. A needle assembly according to claim 5, wherein the shuttle comprises the movable detent. 7. A needle assembly according to claim 7, wherein the detent extends outside the housing. 8. A needle assembly according to claim 5 or claim 6, wherein the detent further comprises a coupling site. 9. A needle assembly comprising: a needle member comprising a needle cannula mounted in a housing, the needle cannula comprising a puncture tip and comprising a needle passageway extending substantially lengthwise through the needle cannula, the housing defining a chamber in fluid communication with the passageway of the needle cannula, the housing further defining a stay outside the chamber; a blunting member comprising a blunting probe mounted in a shuttle, the shuttle carrying a movable detent, the blunting probe comprising a blunt end, the blunting probe being disposed telescopically within the needle cannula while permitting flow through the needle passageway, and being movable between a sharpened configuration in which the puncture tip of the needle cannula is exposed and a blunted configuration in which the blunt end of the blunting probe blunts the needle assembly; wherein the detent is movable between a locking position in which it may bear against the stay and prevent the needle assembly from moving to the sharpened configuration and an unlocked position which permits the needle assembly to move to the sharpened configuration; and the movable detent comprising a coupling site for engagement by an accessory. 10. A needle assembly according to claim 9, wherein the housing further defines an open channel and further wherein the stay is disposed within the open channel. 11. An accessory-needle apparatus comprising: a needle member comprising a needle cannula mounted in a housing, the needle cannula comprising a puncture tip and comprising a needle passageway extending substantially lengthwise through the needle cannula, the housing defining a chamber in fluid communication with the passageway of the needle cannula, the housing further defining a stay outside the chamber; a blunting member comprising a blunting probe, the blunting probe comprising a blunt end, the blunting probe being disposed telescopically within the needle cannula while permitting flow through the needle passageway, and being movable between a sharpened configuration in which the puncture tip of the needle cannula is exposed and a blunted configuration in which the blunt end of the blunting probe blunts the needle assembly, the blunting member also comprising a shuttle carrying a movable detent which may bear against the stay when the needle assembly is in the blunted configuration, the detent being movable between a locking position in which it prevents the needle assembly from moving to the sharpened configuration and an unlocked position which permits the accessory-needle apparatus to move to the sharpened configuration; and an accessory dimensioned and configured to engage and move the detent to the unlocked position when the accessory engages the needle member. 12. The accessory-needle apparatus of claim 11, wherein the accessory is selected from the group consisting of a catheter, a Y-line adapter and a medication vial. 13. The accessory-needle apparatus of claim 11, wherein the detent further comprises: an oblique flange, dimensioned and configured such that when the coupling site engages the accessory, the detent moves