PHLEBOTOMY NEEDLE DESTRUCTION

Abstract

An apparatus for processing a phlebotomy needle having a double-ended needle with a hub between its tips. The apparatus has a clamping electrode for contacting/clamping one end of the needle between the hub and tip and a tip electrode for contacting the needle at its tip. A voltage is applied between the clamping electrode and the tip electrode, to soften/melt the needle via resistive heating, at the same time as the tip electrode is advanced to compress the needle tip and blunt it. The apparatus includes means for allowing the needle to be rotated through so that the first tip and the second tip can be blunted. Also disclosed is means for detaching the needle from a main body and/or for removing a cover covering one end of the needle. The apparatus enables a Vacutainer-type needle to be disassembled into its various parts and the needle rendered blunt and non-hazardous.

Claims

1. An apparatus for processing a phlebotomy needle, the phlebotomy needle comprising: a double-ended needle having a first end terminating in a first tip, and a second end terminating in a second tip; and a hub affixed to the needle at a location between the first tip and the second tip, the apparatus comprising: a clamping electrode for contacting and clamping one end of the needle between the hub and the tip; a tip electrode for contacting the needle at its tip; means for applying a voltage between the clamping electrode and the tip electrode, such that an electric current passes through the end of the needle between the clamping electrode and the tip electrode, which current results, in use. in resistive/Ohmic heating, which heats and softens or melts the tip of the needle; and means for applying an axial force to the tip electrode towards the hub and substantially parallel to an axis of the needle so as to compress and blunt the tip of the needle; the apparatus being characterised by: means for selectively orienting the needle in a first and a second position; the first position being a position in which the clamping electrode clamps the first end of the needle between the hub and the first tip and in which the tip electrode contacts the first tip; and the second position being a position in which the clamping electrode clamps the second end of the needle between the hub and the second tip and in which the tip electrode contacts the second tip.

2. The apparatus of claim 1, wherein the means for selectively orienting the needle comprises a turntable adapted to connect to the hub and to rotate through substantially 180-degrees about a point lying substantially on the axis of the needle.

3. The apparatus of claim 2, wherein the turntable comprises a main body with a through bore whose axis is substantially coaxial with the axis of the needle, the through bore being adapted to connect to the hub of the needle.

4. The apparatus of claim 3, wherein the through bore is internally screw-threaded to screw-threadingly engage with an external screw thread of the hub.

5. The apparatus of claim 1, wherein the phlebotomy needle further comprises a main body affixed to the hub, and wherein the apparatus further comprises a cradle for supporting the main body, the cradle being arranged to support the main body such that the axis of the needle is substantially aligned with a centre of the tip electrode.

6. The apparatus of claim 5, wherein any one or more of the turntable, the cradle and the tip electrode is mounted on a linear slide, which permits the needle to be displaced along a locus that is substantially coaxial with the axis of the needle.

7. The apparatus of claim 6, wherein the turntable, cradle and/or tip electrode is displaced on the linear slide by a linear actuator or a pulley arrangement.

8. The apparatus of claim 1, further comprising a hub grip interposed between the means for selectively orienting the needle and the tip electrode, the hub grip being substantially coaxial with the axis of the needle, adapted to frictionally engage the hub.

9. The apparatus of claim 8, wherein the main body is detachable from the hub by gripping the hub in the hub grip, and by linearly displacing the cradle relative to the hub grip so as to slide or shear the main body off the hub.

10. The apparatus of claim 8, wherein the hub grip further comprises means for rotating the hub grip about the axis of the needle, and wherein the main body is detachable from the hub by gripping the hub in the hub grip, by rotating the hub grip, and optionally by linearly displacing the cradle so as to unscrew the main body from the hub.

11. The apparatus of claim 5, further comprising means for inverting the cradle to release the main body therefrom.

12. The apparatus of claim 1, wherein an end of the needle comprises a cover, and wherein the cover is detachable from the needle by the steps of: displacing the needle such that the cover is positioned between the clamping electrodes; moving the clamping electrodes towards one another so as to grip the cover therebetween; and linear displacement of the needle away from the clamping electrodes so as to slide or shear the cover from the needle.

13. The apparatus of claim 12, further comprising the steps of: moving the clamping electrodes apart; and moving the tip electrode so as to remove the cover from between the clamping electrodes.

14. The apparatus of claim 1, further comprising a tube for receiving a tip of the needle and within which the tip electrode is arranged to slide, the tube being configured to support the needle and prevent or inhibit bowing/bucking thereof during axial compression of the needle by containing the needle as it is melted or softened, and thus prevent discrete droplets of molten needle forming.

15. The apparatus of claim 14, further comprising a thermostatically-controlled healing coil surrounding the tube for pre-heating the tube prior to melting the needle.

16. The apparatus of claim 14, further comprising an induction coil surrounding the tube for pre-heating and/or heating or melting the needle.

17. The apparatus of claim 1, wherein the clamping electrode comprises a pair of opposing metal jaws which move towards each other so as to clamp a portion of the needle therebetween.

18. The apparatus of claim 1, wherein the clamping electrode clamps the needle at any one or more of the positions from the group comprising: within 10 mm of the hub; within 5 mm of the hub; within 2 mm of the hub; within 1 mm of the hub; and more than 1 mm from the hub.

19. The apparatus of claim 1, wherein the tip electrode comprises a concave surface for centralising the tip of the needle therewith.

20. The apparatus of claim 1, wherein the means for applying a voltage comprises any one or more of the group comprising: a DC power supply; an AC power supply; and an RF power supply, the AC, DC or RF power supply is adapted to apply a pulsed voltage between the clamping and tip electrodes, and optionally wherein the AC, DC or RF power supply is adapted to alternately apply a voltage: between the first clamping and first tip electrodes; and between the second clamping and second tip electrodes.

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Description

[0037] Various embodiments of the invention shall now be described, by way of example only, with reference to the accompanying drawings in which:

[0038] FIG. 1 is a schematic cross-sectional view of a known phlebotomy needle;

[0039] FIG. 2 is an exploded view of the known phlebotomy needle of FIG. 1;

[0040] FIGS. 3, 4 and 5 are a sequence showing how the phlebotomy needle of FIG. 1 is typically used;

[0041] FIGS. 6 to 12 are a sequence showing how the phlebotomy needle shown in FIG. 1 can be disposed of using the apparatus/method of the invention;

[0042] FIGS. 13 to 18 show a schematic sequence of a destruction method in accordance with an aspect of the invention;

[0043] FIGS. 19 and 20 show a variation of the destruction method described in relation to FIGS. 13 to 18 previously;

[0044] FIG. 21 is a schematic side view of a phlebotomy needle destructions apparatus in accordance with the invention;

[0045] FIG. 22 is a schematic side view of a phlebotomy needle destructions apparatus in accordance with the invention;

[0046] FIG. 22A is a schematic, partial close-up view of the apparatus shown in FIG. 22;

[0047] FIGS. 23 and 24 are schematic perspective views of a rotation mechanism for rotating the needle;

[0048] FIGS. 25 to 44 are a sequence showing a possible mode of operation of the apparatus shown in FIG. 22; and

[0049] Referring to FIG. 1 of the drawings, a phlebotomy needle 10 comprises a double-ended needle 12 having a first end 14 and a second end 16. Affixed to a mid-portion of the needle 12 is a hub 18, which is a plastics sleeve bonded to the needle 12 by an adhesive bead, such as an epoxy resin (not shown). Mounted on the hub 18 is a main body 20, which is a closed-ended tube of plastics material, which screw-threadingly connects to the hub 18, or push-fits onto the hub, although the particular connection method is not pertinent to this disclosure. The second end 16 of the needle 12 has a rubber cover 22 over it, whose use shall be explained in greater detail below.

[0050] FIG. 2 is simply an exploded view of the known phlebotomy needle 10 shown in FIG. 1.

[0051] Referring now to FIGS. 3, 4 and 5 of the drawings, the known phlebotomy needle 10 is used as follows. Firstly, the first end 14 of the needle 12 is un-capped (the cap is not shown for clarity) and is inserted into the body of a human or animal patient 24. The patient has a skin or tissue layer 26 below which is a tubular blood vessel 28. The first end 14 of the needle 12 pierces the skin-tissue 26 and is positioned with its tip 14 within the blood vessel 28. The pressure of the blood 30 within the blood vessel 28 causes blood to flow up through the needle 12, but it is prevented from squirting out of the second end 16 of the needle by the rubber cover 22, which prevents egress of blood.

[0052] Next, as shown in FIG. 4, a vacuum container 32 is offered up to the phlebotomy needle 10. The vacuum container 32 has an evacuated interior volume 34 enclosed by a hollow, cylindrical main body 36. One end of the vacuum container 32 comprises a pierceable bung 38, which can be pierced by the second end 16 of the needle 12 when it is pushed home 40.

[0053] As can be seen with reference to FIG. 5 of the drawings, the second end 16 of the needle 12 pierces the bung 38 and upon pressing 40 the vacuum container 32 home, the second end of the needle 16 pierces the rubber cover 22 which collapses axially—as shown in FIG. 5 of the drawings. Meanwhile, the bung 38 forms a seal around the exterior of the second end 16 of the needle 12. In addition, the vacuum within the interior 34 of the vacuum container 32 now causes blood 44 to be drawn up 42 through the needle 12 to be retained in the interior volume 34 of the vacuum container. It will be noted that the shape and configuration of the main body 20 of the phlebotomy needle 10 serves to guide and support the vacuum container 32 during its insertion, use and subsequent removal.

[0054] It will be appreciated, by the skilled reader, that upon subsequent withdrawing of the vacuum container 32 from the phlebotomy needle 10, that the bung 38 self-closes as it passes the tip 16 of the needle, thereby sealing a blood sample 44 inside the interior volume 34 of the vacuum container 32. Moreover, upon withdrawing the vacuum container 32 from the main body 20 of the phlebotomy needle 10, the rubber cover 22 tends to spring back to its original configuration, such as shown in FIG. 4 of the drawings, albeit with a small through hole at its end—where the needle previously pierced it. However, because the cover 22 is manufactured of a rubber material, it too tends to self-close upon withdrawal of the vacuum container 32 thereby re-sealing the second end 16 of the needle 12 and thus stopping blood 30 from squirting out through the second end 16 of the needle 12 when the vacuum container 32 has been removed and a blood sample taken.

[0055] It will also be understood by the skilled reader that the same phlebotomy needle can be used to obtain several samples—simply by using a second, third or more vacuum containers 32 in sequence with the needle 10 kept in situ.

[0056] Once sufficient samples have been taken, the phlebotomy needle 10 can be withdrawn from the patient's skin 16 and pressure applied to stop bleeding. Thereafter, the phlebotomy needle 10 needs to be disposed of safely if its first end 14 or its second end 16 are not to pose a needlestick injury hazard to the phlebotomist.

[0057] Turning now to the invention, which is described with reference to FIGS. 6 to 27 of the drawings:

[0058] In FIGS. 6 to 12 of the drawings a schematic sequence of how the invention might work is shown—although it will be appreciated that the order of the various steps may be changed and the order of the following steps in the description that follows is not limiting of the invention.

[0059] Referring to FIG. 6 of the drawings, the phlebotomy needle 10, as previously described, is inserted into an apparatus 50, where one or more clamping electrodes 52 grip the needle 12 near to the hub 18 and hold it in position. The first end 14 of the needle 12 is thus clamped by the clamping electrodes 52, which are made of metal so as to be able to conduct an electric current into the second end 14 of the needle 12 as shall be described below.

[0060] A tip electrode 54 is offered up to the tip of the first end 14 of the needle 12 and an axial force 56 is applied so that the tip electrode 54 abuts the tip of the needle 12.

[0061] Typically, the tip electrode 54 is made of metal so as it can provide a current path through the needle between the clamping electrodes 52 and the tip electrode 54. Typically, the tip electrode 54 has a concave end so as to maintain the correct alignment of the needle 12 during the subsequent processing step.

[0062] A containment cylinder (not shown) may be provided around the needle 12 so as to prevent it from flexing or bowing under the application of the axial stress 56. The use of a containment cylinder, or indeed a heated containment cylinder, is described in published PCT application number WO2015011443, the entire teaching of which is incorporated herein by reference.

[0063] A voltage 58 is applied, e.g. via a pair of fly leads 60, between the clamping electrodes 52 and the tip electrode 54 such that a current passes through the needle 12. The current within the needle results in Ohmic heating of the needle 12, which causes its tip to soften, and subsequently melt. Due to the axial compression 56 applied to the tip electrode during the heating/softening/melting process, the needle 12 is axially deformed and its tip is melted into a blunt ball 62—as shown in FIG. 7 of the drawings.

[0064] The heating, softening or melting and deformation of the needle 12 in this way is particularly advantageous because the heat within the needle is sufficient to kill bacteria, pathogens, viruses and other contaminants; whilst at the same time, the axial compression converts the previously sharp tip of the needle 12 into a blunt ball 62—thereby rendering it “safe” from a needlestick injury point of view.

[0065] In other words, by way of the process shown in FIGS. 6 and 7 of the drawings, the first end 14 of the needle 12 is rendered “safe”—but that still leaves the second end 16 of the needle to be dealt with.

[0066] Turning now to FIG. 8 of the drawings, another or the next step in the procedure is to remove 64 of the main body 20 of the phlebotomy needle 10 and this can be achieved relatively easily either by unscrewing it, or by simply applying an axial force in the direction of arrow 64 so as to shear it away from the hub 18. This leads, as can be seen in FIG. 8 of the drawings, to the phlebotomy needle 10 with a blunt first end, a hub 18 and the second end 16 still covered by the rubber cover 22. The main body 22 of the phlebotomy needle 10 can be disposed of 66 into a first waste stream for example, a plastics recycling waste stream, if required/necessary.

[0067] Turning now to FIG. 9 of the drawings, the rubber cover 22 can be removed from the second end 16 of the needle 10 via a “pinch and pull” type process, indicated, schematically, by arrow 68 in FIG. 9. Likewise, the rubber cover 22 can be disposed of via a second waste stream 70, namely a rubber waste stream, if necessary and/or desired.

[0068] At this point, the phlebotomy needle 10 comprises a first end 12, which has been blunted into a ball 62 and an exposed, sharp second end, which also needs to be rendered safe. To achieve this, a melting process, such as that described above in relation to FIGS. 6 and 7 can be employed using a further tip electrode 54 and further voltage supply 68.

[0069] However, for convenience, and in order to avoid duplication of parts, the invention proposes to rotate 72 the needle 10 through 180 degrees and to offer it up to the same tip electrode 54 that was used previously. An axal compression 56 and a voltage 58 can be applied to melt the second end 16 of the needle 12 into a blunt ball 63, as shown in FIG. 11.

[0070] However, if the clamping electrodes 52 are used as they were before, namely gripping the first end 14 of the needle, 12, then it has been found that the epoxy bead, which bonds the hub 18 to the needle 12 can burn due to the heating of the needle during the softening/melting process.

[0071] The solution to this problem, as proposed by the invention, it so re-grip the needle at a second position. That is, the needle 12 is clamped at its second end 16, close to the hub 18, and this involves simply opening up and then reclosing 74 the clamping electrodes 52 so as to grip the needle 12 on its second end 16, rather than at its first end 14. The effect of this is that the electric current pathway does not pass through the part of the needle 12 which is surrounded by the hub 18, and so heating of the hub 18 is minimised.

[0072] The result is shown in FIG. 11 of the drawings, namely a needle 12 with its first end 14 melted into a blunt ball 62, and its second end 16 melted into a similar blunt ball 63.

[0073] Next, as shown in FIG. 12, by withdrawing 76 the clamping electrodes 52 and by withdrawing 78 the tip electrode 54, the now-safe needle 12 can be disposed of via a further waste stream 80 if necessary, or desired.

[0074] It will be appreciated from the foregoing description that the invention provides a means for safely disposing of phlebotomy needles 10 in a manner that has hitherto not been contemplated.

[0075] A variation of the phlebotomy needle destruction method described in relation to FIGS. 6 to 12 of the drawings is shown in FIGS. 13 to 18 of the drawings.

[0076] Here, as can be seen in FIG. 13, the rubber cover 22 and the main body have been removed from the phlebotomy needle 10, for example using the axial removal method described previously—leaving just a needle 12, with a sharp first end, a sharp second 18 16 and its hub 18 secured somewhere along its midpoint.

[0077] Referring now to FIG. 14 of the drawings, two sets of clamping electrodes 52 are provided—one on either side of the hub 18—so as to provide separate electrical conduction pathways between each end of the needle 14, 16 and a respective pair of tip electrodes 54, which are pushed 56 into axial engagement with their respective needle ends 14, 16. It will be noted that due to this configuration, there is no current pathway through the needle where the hub 18 surrounds the needle 12, and thus, heating of the needle 12 in the vicinity of the hub 18 is minimised.

[0078] As shown in FIG. 14 of the drawings, a first voltage V1, 58 is applied between one set of clamping electrodes 52 and its respective tip electrode 54 (the left-hand set in the drawing) and the axial compression 56 applied. The result is the first end of the needle 14 being melted into a blunt, rounded ball 62 in the manner previously described. At this stage, the right-hand side of the system is in an open circuit condition, that is to say without a voltage being applied between the right-hand clamping electrodes 52 ad the right-hand tip electrode 54.

[0079] Turning now to FIG. 16, V1 is disconnected and a second voltage V2, 58 is now applied to the clamping electrodes 52 and the tip electrode 54 on the right-hand side, namely at the second end 16 of the needle 12. The axial compression 56, combined with the voltage 58 applied causes the second end 16 of the needle 12 to be melted into a blunt ball 63 as shown in FIG. 17 of the drawings.

[0080] Once both ends of the needle have been melted into respective, blunt balls, 62, 63, the tip electrodes 54 can be withdrawn 78 and the clamping electrodes 52 retracted 76 thereby freeing/releasing the needle 12 for subsequent disposal in a waste stream 80, as previously described.

[0081] A yet further variation of the needle destruction method previously described is shown in FIGS. 19 and 20 of the accompanying drawings, in which FIG. 19 shows substantially the same set up to that shown in FIG. 14 of the drawings and, therefore, identical reference signs have been used to identify identical features to avoid unnecessary repetition herein.

[0082] The difference here is that voltages V1 and V2, 58 are applied simultaneously such that both ends 12, 14 of the needle 12 are melted into the respective blunt balls 62, 63—as shown in FIG. 20, simultaneously. Because the clamping electrodes 52 are maintained at the same potential, there are two separate current pathways within the needle, namely a first current pathway going from the left-hand clamp electrodes 52, through the first end 14 of the needle 12 and into the left-hand tip electrode 54; and a second current pathway going through the right-hand clamping electrodes 52, the second end 16 of the needle 12 and the right-hand tip electrode 54.

[0083] Because the potentials of both sets of the clamping electrodes 52 are the same, there is very little, or zero current flowing through the needle 12 in the region of the hub, and this avoids, or reduces the likelihood of the hub getting too hot or catching fire during the process.

[0084] In a yet further possible embodiment of the invention, voltages V1 and V2 are pulsed, and are applied alternately such that only one of the aforesaid current paths is in operation at any given moment in time. This also avoids current passing through the needle in the region of the hub, thereby potentially causing the hub 18 to heat and/burn and this is a further possible benefit of the invention.

[0085] FIG. 21 of the drawings is a schematic side view of an apparatus 200 for destroying a phlebotomy needle (not shown). The apparatus 200 comprises a slide rail 202 onto which the various components of the apparatus 200 are slidingly mounted. The slide rail 202 is mounted on a support chassis 204, in this case a vertical board, that is held upright by a base plate 206. The slide rail 202 carries a carriage assembly 208, which has mounted on it, a cradle 210 for holding the cover 20 of a phlebotomy needle, and a turntable 212, which is also rotatably connected to the carriage 208, and which has an internal bore 214 for connecting to the hub 18 of a phlebotomy needle. The carriage 208 is driven by a first pulley mechanism 212 to slide along the slide rail, as indicated by dash lines 208′.

[0086] Meanwhile, a hub grip 216 is provided, which is mounted at the centre of a bevel gear 218, which is driven for rotation by a complementary bevel gear 220 and by a motor 222.

[0087] On the opposite side of the hub grip 216 to the carriage 208, there is provided a set of clamping electrodes 52, which can be moved towards each other so as to clamp the needle 12 in use.

[0088] A tip electrode 54 is also slidingly mounted on the slide rail 202 and is driven by a second pulley system 214 so that it can be moved along the slide rail 202 as indicated by 54′.

[0089] FIG. 22 shows a little more detail of the view shown in FIG. 21, namely how the cradle 210 and the table 212 can be rotated relative to the carriage 208, which is in-turn driven for linear movement by the first pulley assembly 213.

[0090] It can be seen, from FIG. 22, that the cradle 210 is pivotally mounted on an axle 216, which is driven by a gear 218. Likewise, the turntable 212 is mounted on an axle 220 and is driven by a second gear 222. A rack 224 can be arranged to engage with either of the gears, 218, 212 so that when the carriage 208 is driven by the first pulley assembly 213 in either direction, the rack 224 engages with the respective gear 218, 222 to rotate the cradle 210 and/or the turntable 212.

[0091] Other means for reorienting the cradle 210 could be provided. In certain embodiments, the means for reorienting the cradle 210 comprises mounting the cradle 210 on an axle or other pivot, which is driven by a DC or stepper motor so that it can be inverted.

[0092] FIG. 22A shows how the apparatus may further comprise a tube 400 for receiving a tip of the needle 12 and within which the tip electrode 52 is arranged to slide. The tube 400 is suitably configured to support the needle 12 and prevent or inhibit it from bowing/bucking during axial compression of the needle. Additionally or alternatively, the tube 400 may be configured to contain the needle as it is melted or softened, and thus prevent discrete droplets of molten needle forming. As the needle gets hot during the melting/destruction procedure, the tube 400 is suitably manufactured of a refractory material, such as quartz. In certain embodiments, a coil 402 surrounds the tube 400. The coil 402 can be any one or more of: a thermostatically-controlled heating coil surrounding the tube for pre-heating the tube and/or needle prior to melting the needle; and an induction coil surrounding the tube for pre-heating and/or heating or melting the needle. Either may be useful for driving-off or evaporating moisture from within the tube 400 and/or the internal bore of the needle, which often contains blood or other fluids, which might adversely affect the melting of the needle into a contiguous ball during the destruction process. The latter may be used to assist in the melting of the needle into a blunt ball.

[0093] Referring to FIGS. 23 and 24 of the drawings, which show the assembly for the turntable 212, the rack 224 is supported by the main body portion 232, which can be driven by a further rack 234 and pinion 236 towards 240 the gear 218. As the carriage 208 is advanced 224, the teeth of the rack 224 engage with the teeth of the gear 218 to cause the turntable 212 to rotate 228 about an axis 230.

[0094] Referring to FIG. 24, when the main body 232 is retracted 244, the rack 223 no longer engages with the gear 218, and so linear movement 224 of the carriage 208 no longer causes the turntable 212 to rotate.

[0095] It will be appreciated that the same, or different, racks 224 can be used to actuate either gear 218, 222 and so effect independent or co-ordinated rotation of the cradle 210 and turntable 212, as required. In other embodiments, the axles 216, 220 are directly driven, for example, by motors.

[0096] The sequence of operation of the apparatus 200 is shown in FIGS. 25 to 44 of the drawings as follows:

[0097] In FIG. 25, the apparatus 200 is in an, initial start position with the carriage 208 retracted and the cradle 210 being oriented upright for receiving a phlebotomy needle 10, which can simply be dropped into the cradle 210. The cradle 210 has an end 211, which engages formations 215 of the phlebotomy needle 10 so as to hold it in position, axially relative to the cradle 210. In FIG. 26, it can be seen that the carriage 208 can be advanced 300 (using the first pulley assembly 213) such that the first tip 14 of the phlebotomy needle 12 passes through the hub grip 219, as shown in FIG. 27 at which point, the hub grip 219 frictionally engages the hub 18 of the phlebotomy needle 10.

[0098] As shown in FIG. 27, the clamping electrodes 52 are moved in towards each other so as to grip the needle 12.

[0099] Referring now to FIG. 28 of the drawings, voltage 302 is then applied between the clamping electrodes 54 and the tip electrode 54, so as to soften and blunten the tip 14 of the needle into a ball, as previously described. The tip electrode 54 is advanced 304 throughout this process, and as previously described, “destroys” the first end of the needle 12.

[0100] Next, as shown in FIG. 29, the hub grip 219 is rotated so whilst the carriage 208 is retracted 306. This unscrews the cover 20 from the hub 18, which means that, as shown in FIG. 30, when the carriage is fully-retracted, the needle 12 is thus separated from the cover 20.

[0101] As shown in FIGS. 30 and 31, the cradle 210 is then rotated 308 to the position shown in FIG. 31, where the cover 20 then drops away 310 into a waste bin (not shown).

[0102] The next stage in the procedure, as shown in FIG. 32, involves rotating the needle 12 using the motor 222 and hub grip 219, whilst releasing the clamping electrodes 52 and advancing 312 the carriage 208. When the turntable 212 reaches the hub 18, as shown in FIG. 33, the screw thread on the hub, which previously retained the cover 20, now engages with a screw thread in the bore 214 of the turntable 212.

[0103] The carriage 208 can now be retracted 316 to the position shown in FIG. 34, and the turntable 214 rotated 318 so as to present the opposite end of the needle 12 to the tip electrode 54, as shown in FIG. 35.

[0104] Advancing 320 the carriage 208 again results in a configuration shown in FIG. 36—where the rubber cover 16 is now extending into the “needle destruction” part of the device 200 where it can be gripped by the clamping electrodes 52 as shown in FIG. 37.

[0105] The next stage in the process involves retracting 222 the carriage 208 once again so as to separate the rubber cover 16 (now gripped by the clamping electrodes 52) from the second end of the needle 12, as shown in FIG. 38.

[0106] Meanwhile, the tip electrode 54 is advanced 324, once the clamping electrodes 52 have been re-opened, so as to push/eject 326 the rubber cover 16 into another waste bin (not shown).

[0107] The procedure continues by the carriage 208 being advanced 326 once again so that the second end of the needle 12 lies between the clamping electrodes 52, as shown in FIG. 41, where the tip electrode 54 can be advanced once again towards the needle 12 so as to destroy it.

[0108] As shown in FIG. 42, this is once again achieved by applying a voltage 302 between the clamping electrodes 52 and the tip electrode 54, whilst advancing the tip electrode in the afore-described manor. This softens and blunts the second end of the needle 12 into a blunt ball, as previously described.

[0109] The final stages of the procedure are shown in FIGS. 43 and 44 of the drawings, where the motor 222 is rotated again so as to unscrew the hub 18 from the bore 214 of the turntable 212, thereby releasing it. Retraction 328 of the carriage 208 results in the destroyed needle 12 falling away 330 into a further waste collection receptacle (not shown).

[0110] The invention is not restricted to the details of the foregoing embodiment(s) which are merely exemplary. For example, a containment cylinder or a heated containment cylinder may be placed around the needle during its axial compression to prevent it from buckling under the application of an axial stress; and the order of the processing steps may be altered without departing from the scope of the invention. Further, whilst one embodiment of the invention has been described, which uses a linear actuator and a turntable, this is just an example, and is not limiting of the invention. For example, the same or a similar process may be performed using a carousel—or other type of arrangement, where each processing step is carried out in sequence, at different positions. The materials and any dimensions mentioned herein are exemplary only and are not necessarily intended to limit the scope of this disclosure, except where necessary for a particular function to work.