fig1 shows a cross - sectional top view of an exemplary embodiment of a needle storage magazine 1 . the needle storage magazine 1 comprises a case 2 that can be mounted on a standard insulin pen and inside the case 2 an arrangement of needles 3 . 1 , 3 . 2 , 3 . 3 moving along a tape 4 , e . g . a tractor tape . the case 2 is arranged within a cap 8 . the needles 3 . 1 , 3 . 2 , 3 . 3 are arranged such that their axes are in parallel to each other and to a center axis 5 of the insulin vial / the insulin pen . the tape 4 is wrapped around a sliding carriage 17 with a crescent - shape cross section and an inner shell 2 . 1 of the case 2 having a circular arc shaped cross section covering about three quarters of a circle . an outer shell 2 . 2 of the case 2 is arranged outwardly of the tape 4 so that a track for the tape 4 is defined between the inner shell 2 . 1 and the outer shell 2 . 2 . the sliding carriage 17 has a convex surface 17 . 1 arranged within the inner shell 2 . 1 of the case 2 and a concave surface 17 . 2 , wherein the concave surface 17 . 2 is arranged within the opening of the inner shell 2 . 1 . in an exemplary embodiment every needle 3 . 1 , 3 . 2 , 3 . 3 is fitted in a needle support 6 that is thread on the tape 4 , similar to pearls on a necklace . the unused needles 3 . 1 are in a position a on the surface of the inner shell 2 . 1 before the tape 4 enters the concave surface 17 . 2 . a separation wheel 7 arranged within a clearance created by the concave surface 17 . 2 and engaged by a gear wheel 9 is arranged to rotate in a rotational direction r and grabs the needles 3 . 1 one by one from the position a and moves them to a centre position b on the concave surface 17 . 2 . in the centre position b the needle 3 . 2 is concentric to the vial of the insulin pen . a septum of the vial can be penetrated by a proximal tip of the needle 3 . 2 and insulin can be dispensed . after use the needles 3 . 3 are moved out of the concave surface 17 . 2 into a position c on the inner shell 2 . 1 opposite the position a . fig2 is a detail view showing an exemplary embodiment of the separation wheel 7 , the tape 4 , one unused needle 3 . 1 and the needle in use 3 . 2 with their respective needle supports 6 . fig3 shows an exemplary embodiment of how the needles 3 . 1 are fitted into the needle supports 6 and how the needle supports 6 are aligned on the tractor tape 4 . each needle 3 . 1 is fitted into one needle support 6 . the needle supports 6 may have a hyperboloid cross section so as to allow the tape 4 to be bent in both directions . each needle support 6 has an opening 11 where the tape 4 is guided through . in order to have a defined friction between the tape 4 and the needle support 6 , the needle support 6 is equipped with a latch 10 that touches the tape 4 , which has a saw - tooth outline for engaging the separation wheel 7 and the latches 10 . in order to keep the needles 3 . 1 sterile , in an exemplary embodiment each needle 3 . 1 is packed in a blister foil 12 . the blister foil 12 of the unused needles 3 . 1 are connected to each other . between the needles 3 . 1 the blister foil exhibits perforations 13 so that they can be separated easily . in an exemplary embodiment of in order to move an unused needle 3 . 1 to the exposing position b in the centre of the needle storage magazine 1 the user rotates the magazine &# 39 ; s cap 8 engaged to the gear wheel 9 . the rotation is transferred by the gear wheel 9 to the separation wheel 7 . in order to transfer the movement from the separation wheel 7 to the tape 4 both the separation wheel 7 and the tape 4 have a saw tooth contour for providing a mechanical transmission by form closure ( cf . fig2 ). the separation wheel 7 has a number of notches in which a needle support 6 can enter . when the separation wheel 7 rotates it picks up the needle supports 6 one by one from position a and transports them to the exposing or centre position b . due to this action the perforation 13 connecting the currently engaged needle 3 . 1 to the rest of the unused needles 3 . 1 is broken . the cap 8 may be engaged to the case 2 by a ratchet so that it can only rotate in one direction for preventing inadvertent or deliberate reuse of a needle 3 . 2 , 3 . 3 . when the needle supports 6 are in position a and the separation wheel 7 with a needle 3 . 1 in the notch has moved on the needle supports 6 in position a do not move further since the latches 10 can jump over the saw - teeth of the tape 4 so the tape 4 slides through them . but because of the friction between the needle supports 6 and the tape 4 , they are pushed towards the separation wheel 7 . in an exemplary embodiment of a last needle support 6 at the unused end of the tape 4 does not contain a needle 3 . 1 and is larger than the other needle supports 6 so that it cannot enter the notches . when the end of the tape 4 is reached this is indicated to the user by stalling of the mechanism due to the larger needle support 6 prevented from entering the notch . furthermore used needles 3 . 3 are prevented from being transported by the separation wheel 7 , since they can advance on the inner shell 2 . 1 only to the next position after the larger needle support 6 . fig4 a is a longitudinal section of an exemplary embodiment of an injection pen 14 with a needle storage system 1 prior to extending the needle 3 . 2 from the cap 8 . the section plane a - a in fig4 a is the section plane of the cross sectional view of fig1 . fig4 b is a longitudinal section of the injection pen 14 with the needle 3 . 2 extended for insertion into an injection site . the pen 14 is fixed within the sliding carriage 17 . in an exemplary embodiment the needle 3 . 1 , 3 . 2 , 3 . 3 is a hollow needle made preferably from stainless steel and arranged as a double pointed needle with a pointed distal tip and a pointed proximal tip . the pointed proximal tip is adapted to be inserted into a vial 16 containing a medicament or drug , e . g . insulin that is retained in the injection pen 14 so that a fluid communication is established between the vial 16 and the needle 3 . 2 . for connecting the needle 3 . 2 to the pen 14 , in an exemplary embodiment the pen 14 and the sliding carriage 17 are pushed towards the needle 3 . 2 , which is in the exposing position b . the needle 3 . 2 penetrates the septum 18 of the insulin vial 16 . the pen 14 pushes the sliding carriage 17 with the needle 3 . 2 , the separation wheel 7 and the gear wheel 9 and slides them towards a distal direction d . therefore a part of the needle 3 . 2 moves through an opening 19 out of the case 2 thereby penetrating the blister foil 12 which remains around the needle 3 . 2 inside the device . now , the drug , e . g . insulin can be dispensed . only the needle 3 . 2 in use , i . e . in the exposing position moves axially , the other needles 3 . 1 , 3 . 3 remain in their positions . the tape 4 is sufficiently expandable or flexible to allow this relative movement . fig5 a is a longitudinal section of an exemplary embodiment of an injection pen 14 with an alternative needle storage system 1 . fig5 b is a corresponding cross sectional view of the needle storage system 1 in the section plane a - a shown in fig5 a . in this embodiment the needle 3 . 1 , 3 . 2 can be brought into the exposing position b without stretching the tape 4 . in this concept the needle 3 . 1 , 3 . 2 , 3 . 3 is not fixed to the needle support 6 but to a jacket 20 attached over the needle 3 . 1 , 3 . 2 , 3 . 3 . the jacket 20 and hence the needle 3 . 1 , 3 . 2 , 3 . 3 can move axially with respect to the needle support 6 . the jacket 20 has distal and proximal stops 20 . 1 , 20 . 2 allowing the needle 3 . 1 , 3 . 2 , 3 . 3 to travel a certain distance within the needle support 6 . in this embodiment the separation wheel 7 and gear wheel 9 are arranged on the case 2 , not on the sliding carriage 17 . the inner shell 2 . 1 of the case 2 has a crescent - shape cross section with a convex surface 2 . 3 and a concave surface 2 . 4 . in an exemplary embodiment every needle 3 . 1 , 3 . 2 , 3 . 3 is fitted in a needle support 6 that is thread on the tape 4 . the unused needles 3 . 1 are in a position a on the convex surface 2 . 3 of the inner shell 2 . 1 before the tape 4 enters the concave surface 2 . 4 . the separation wheel 7 is arranged within the clearance created by the concave surface 2 . 4 and engaged by the gear wheel 9 . the separation wheel 7 is arranged to rotate in the rotational direction r and to grab the needles 3 . 1 one by one from the position a for moving them to the centre position b on the concave surface 17 . 2 . the septum 18 of the vial 16 can be penetrated by the needle 3 . 2 and insulin can be dispensed . after use the needles 3 . 3 are moved out of the concave surface 2 . 4 into a position c on the convex surface 2 . 3 opposite the position a . in an exemplary embodiment when the injection pen 14 and the sliding carriage 17 are pushed towards the needle storage magazine 1 in the distal direction d , the separation wheel 7 and the gear wheel 9 as well as the needle supports 6 remain in their axial positions within the case 2 , while the needle 3 . 2 in use and the injection pen 14 move axially in the distal direction d . in an exemplary embodiment a selection sleeve 24 in the shape of a hollow cylinder is wrapped around the case 2 and arranged to engage the gear wheel 9 so that on rotation of the selection sleeve 24 the gear wheel 9 and the separation wheel 7 are rotated . the selection sleeve 24 may be engaged to the case 2 by a ratchet so that it can only rotate in one direction for preventing inadvertent or deliberate reuse of a needle 3 . 2 , 3 . 3 . in an exemplary embodiment the needle storage magazine 1 with the needle 3 . 2 to be used hidden within the case 2 can only be brought into a using state where the needle 3 . 2 comes out of the case 2 if a button ( see fig6 a ) in the cap 8 or in the selection sleeve 24 is pushed to prevent unintended actuation . when the working position of the needle 3 . 2 is reached , i . e . the needle 3 . 2 extending from the case 2 has reached a defined insertion depth ; the button snaps in place again and fixes the cap 8 . the needle storage magazine 1 can be returned in the distal direction d for covering the needle 3 . 2 by pushing the button again and translating the needle storage magazine 1 . in an alternative exemplary embodiment the button does not snap in place in the working position and the injection pen 14 is refracted with respect to the needle storage magazine 1 by a spring ( not illustrated ). this system would allow for insulin injections without exposing the needle 3 . 2 to the patient , which is a great benefit for patients who suffer from belonephobia . in an exemplary embodiment the release button 22 can be embodied as shown in a and 6 b . the release button 22 is a contour embedded in the cap 8 or selection sleeve 24 that works as a rocker around a pivot 25 , where it is connected to the cap 8 or selection sleeve 24 , so that the button 22 rotates around an axis , which is transversal to and offset from the longitudinal axis 5 of the injection pen 14 . when the button 22 is pushed in a radially inward direction i a catch 23 on the rocker 22 is pulled out of one of two notches 26 . 1 , 26 . 2 in the sliding carriage 17 in a radially outward direction 0 , so the sliding carriage 17 is unlocked from the cap 8 or selection sleeve 24 and the injection pen 14 can move relative to the needle storage magazine 1 in the distal direction d and push the needle 3 . 2 out of the opening 19 or in the proximal direction p for retracting the needle 3 . 2 into the needle storage magazine 1 . the catch 23 can engage the respective other notch 26 . 2 , 26 . 1 at the end of this movement locking the injection pen 14 and needle storage magazine 1 in the respective position . fig7 is a lateral view of an exemplary embodiment of the cap 8 or selection sleeve 4 . to display the amount of unused needles 3 . 1 remaining in the needle storage magazine 1 to the user , numbers are printed on the needle blister foils 12 . the user can see the number in a transparent window 27 in the case 2 , the cap 8 or the selection sleeve 24 .
the invention relates to a needle storage magazine for storing a number of injection needles and attaching and / or detaching them to or from an injection device , the needle storage magazine comprising a crescent shaped track having a convex part and a concave part , wherein the track is adapted to hold a set of needles in respective needle supports within the track , wherein the convex part is adapted to hold unused needles and used needles , wherein a centre position is defined within the concave part for a needle in use or to be used , wherein a sliding carriage is arranged for attaching the injection device to the needle storage magazine such that the centre position is essentially concentric to a longitudinal axis of the injection device , wherein a separation wheel is rotatably arranged , the separation wheel having at least one notch for entraining the needle support of one unused needle at a time from the convex part into the centre position or the needle support of the needle in use out of the centre position onto the convex part .