Hypodermic needle and fluid injection device

A fluid injection device as claimed in any preceding claim, wherein in the unstressed position, the at least one further needle protrudes beyond both the axial and radial termini of the first needle.

A fluid injection device as claimed in any preceding claim, wherein the driving means is automatic.

A fluid injection device as claimed in any preceding claim, wherein the/each said further needle is formed of or from a superelastic shape memory alloy.

A hypodermic needle comprising a first, hollow needle having movably secured therein at least two further, hollow needles, each said further needle and part of the hypodermic needle being movable relative to one another between a stressed position of each further needle, in which each said further needle is substantially parallel to the first needle, and an unstressed position of each further needle, in which the free end of each said further needle lies beyond the axial and/or radial terminus of the first needle;

• and
• wherein each further needle is of substantially the same length and internal diameter, for discharging a fluid from each further needle at a substantially uniform fluid flow rate, and wherein at least one of the further needles is axially staggered with respect to the at least one other further needle, such that an inlet of the at least one further staggered needle is axially spaced from an inlet of said at least one other further needle.

A fluid injection device comprising a hypodermic needle including a first, hollow needle having movably secured therein at least two further, hollow needles, each said further needle and part of the hypodermic needle being movable relative to one another between a stressed position of each further needle, in which each said further needle is substantially parallel to the first needle, and an unstressed position of each further needle, in which the free end of each said further needle lies beyond the axial and/or radial terminus of the first needle;

• wherein each further needle is of substantially the same length and internal diameter, for discharging a fluid from each further needle at a substantially uniform fluid flow rate, and wherein at least one of the further needles is axially staggered with respect to the at least one other further needle, such that an inlet of the at least one further staggered needle is axially spaced from an inlet of said at least one other further needle;
• and
• driving means for driving fluid from the at least two further hollow needles at a substantially constant fluid flow rate.

A hypodermic needle comprising a first, hollow needle adapted to have movably secured therein a further hollow needle, the further needle and the first hollow needle being movable relative to one another between a stressed position of the further needle, in which the further needle is substantially parallel to the first needle, and an unstressed position of the further needle, in which the free end of the further needle lies beyond the axial and radial terminus of the first needle, the further needle being rotatable with respect to the first needle, for locating the free end of the further needle in a desired rotational orientation with respect to the first needle.