In one aspect, the dual bevel needle can include a hollow tube having a proximal end, a distal end, a first lateral side, and a second lateral side opposite the first lateral side; a first needle point at the distal end of the hollow tube; a second point at the distal end of the hollow tube; a first bevel on each of the first lateral side and the second lateral side, the first bevel comprising a first bevel angle relative to a longitudinal axis of the tube; and a second bevel on each of the first lateral side and the second lateral side, the second bevel having a second bevel angle relative to the longitudinal axis of the tube, wherein the first and second bevels each form a portion of an ellipse, the ellipse having an inner cutting edge and terminating in the first and second needle points at the distal end of the tube, the second bevel angle being shallower than the first bevel angle, the second bevel being located adjacent the proximal end of the first bevel, and the inner cutting edge converging to a narrow heel.

In one aspect, the dual bevel needle can include a hollow tube having a proximal end, a distal end, a first lateral side, and a second lateral side opposite the first lateral side; a first needle point at the distal end of the hollow tube; a second point at the distal end of the hollow tube; a first bevel on each of the first lateral side and the second lateral side, the first bevel comprising a first bevel angle relative to a longitudinal axis of the tube; and a second bevel on each of the first lateral side and the second lateral side, the second bevel having a second bevel angle relative to the longitudinal axis of the tube, wherein the first and second bevels each form a portion of an ellipse, the ellipse having an inner cutting edge and terminating in the first and second needle points at the distal end of the tube, the second bevel angle being shallower than the first bevel angle, the second bevel being located adjacent the proximal end of the first bevel, and the inner cutting edge converging to a narrow heel.

In one aspect, the dual bevel needle can include a hollow tube having a proximal end, a distal end, a first lateral side, and a second lateral side opposite the first lateral side; a first needle point at the distal end of the hollow tube; a second point at the distal end of the hollow tube; a first bevel on each of the first lateral side and the second lateral side, the first bevel comprising a first bevel angle relative to a longitudinal axis of the tube; and a second bevel on each of the first lateral side and the second lateral side, the second bevel having a second bevel angle relative to the longitudinal axis of the tube, wherein the first and second bevels each form a portion of an ellipse, the ellipse having an inner cutting edge and terminating in the first and second needle points at the distal end of the tube, the second bevel angle being shallower than the first bevel angle, the second bevel being located adjacent the proximal end of the first bevel, and the inner cutting edge converging to a narrow heel.

A medical hollow needle assembly includes an outer cylindrical body including a through-hole; a hollow needle having an outer peripheral surface, wherein a proximal portion of the hollow needle is disposed in the through-hole of the outer cylindrical body, and wherein the outer peripheral surface of the hollow needle has an outer reduced-diameter surface that has a smaller outer diameter than that of a more proximal portion of the outer peripheral surface of the hollow needle; and an inner cylindrical body including an insertion hole in which the hollow needle is disposed, wherein the inner cylindrical body is disposed between the hollow needle and an inner peripheral surface of the through-hole of the outer cylindrical body, and wherein the inner cylindrical body joins the outer cylindrical body and the hollow needle.

A medical hollow needle assembly includes an outer cylindrical body including a through-hole; a hollow needle having an outer peripheral surface, wherein a proximal portion of the hollow needle is disposed in the through-hole of the outer cylindrical body, and wherein the outer peripheral surface of the hollow needle has an outer reduced-diameter surface that has a smaller outer diameter than that of a more proximal portion of the outer peripheral surface of the hollow needle; and an inner cylindrical body including an insertion hole in which the hollow needle is disposed, wherein the inner cylindrical body is disposed between the hollow needle and an inner peripheral surface of the through-hole of the outer cylindrical body, and wherein the inner cylindrical body joins the outer cylindrical body and the hollow needle.

A penetration test apparatus may include a penetration unit having a needle-shaped conductor formed in the shape of a sharp needle, a guide unit configured to push out the penetration unit such that the needle-shaped conductor bores a side of a battery cell, and a holder configured to receive the penetration unit. When the guide unit pushes the penetration unit, the needle-shaped conductor of the penetration unit can penetrate the side of the battery cell. A battery cell penetration test method using the penetration test apparatus is also disclosed.

A penetration test apparatus may include a penetration unit having a needle-shaped conductor formed in the shape of a sharp needle, a guide unit configured to push out the penetration unit such that the needle-shaped conductor bores a side of a battery cell, and a holder configured to receive the penetration unit. When the guide unit pushes the penetration unit, the needle-shaped conductor of the penetration unit can penetrate the side of the battery cell. A battery cell penetration test method using the penetration test apparatus is also disclosed.

A neck hole of a dispense tip is formed through a length of a body from an input end to an output end. An inlet hole is formed at a distal end of the neck hole, the inlet hole having a first inner diameter. An outlet hole is formed at a distal end of the inlet hole, the outlet hole having a second inner diameter less than the first. A first inner taper transitions the inlet hole from the first inner diameter to the second inner diameter. An outer taper is formed having a width that decreases along a longitudinal axis of the length of the neck hole at a distalmost end. The width of the outer taper is reduced at the distalmost end at the output end of the body of material from a first outer width to a second outer width less than the first outer width.

A neck hole of a dispense tip is formed through a length of a body from an input end to an output end. An inlet hole is formed at a distal end of the neck hole, the inlet hole having a first inner diameter. An outlet hole is formed at a distal end of the inlet hole, the outlet hole having a second inner diameter less than the first. A first inner taper transitions the inlet hole from the first inner diameter to the second inner diameter. An outer taper is formed having a width that decreases along a longitudinal axis of the length of the neck hole at a distalmost end. The width of the outer taper is reduced at the distalmost end at the output end of the body of material from a first outer width to a second outer width less than the first outer width.

A medical puncture needle includes an end portion including a needle tip; and a main body portion contiguous with the end portion, having a substantially circular cross-sectional outer shape. The end portion includes a first bevel formed by a curved surface, the bevel having an angle that gradually decreases toward the needle tip in an axial direction, in a cross-section orthogonal to the axial direction, relative to an imaginary plane that extends along an axis of the main body portion.