WO2004047890A1 - Vorrichtung zum automatischen injizieren eines wirkstoffes - Google Patents
Vorrichtung zum automatischen injizieren eines wirkstoffes Download PDFInfo
- Publication number
- WO2004047890A1 WO2004047890A1 PCT/CH2003/000755 CH0300755W WO2004047890A1 WO 2004047890 A1 WO2004047890 A1 WO 2004047890A1 CH 0300755 W CH0300755 W CH 0300755W WO 2004047890 A1 WO2004047890 A1 WO 2004047890A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- spring
- display
- spring element
- transmission part
- injection needle
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
- A61M5/2033—Spring-loaded one-shot injectors with or without automatic needle insertion
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
- A61M2005/206—With automatic needle insertion
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
- A61M2005/2073—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically preventing premature release, e.g. by making use of a safety lock
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M2005/3125—Details specific display means, e.g. to indicate dose setting
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
- A61M2005/31518—Piston or piston-rod constructions, e.g. connection of piston with piston-rod designed to reduce the overall size of an injection device, e.g. using flexible or pivotally connected chain-like rod members
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
- A61M5/31566—Means improving security or handling thereof
- A61M5/3157—Means providing feedback signals when administration is completed
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/326—Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
Definitions
- the application relates to a device for automatically injecting an active substance, with a container for the active substance, which together with an injection needle connected to it can be displaced in a housing for the purpose of inserting the injection needle, with a syringe plunger which can be displaced in the container for the purpose of dispensing the active substance.
- auto-injectors Devices of the type mentioned at the beginning, so-called auto-injectors, are known in many designs. They are used in particular to administer medication that the patient injects himself. A problem of such auto-injectors that has only been solved to date unsatisfactorily is that the patient, after the injection needle has been inserted, does not know how long it takes for the medication to be dispensed and when he can pull the injection needle out again.
- One possible solution to this problem is to connect a display element that is visible from the outside to the syringe plunger.
- This object is achieved according to the invention in that the displacement path of a display which is visible from the outside is smaller than the entire displacement distance of the syringe plunger relative to the housing. This reduction in the transfer of the path of the syringe plunger to the display increases the freedom of design in the construction of the display, because the display covers a path that is not directly dependent on the path of the syringe plunger.
- a transmission part which can be displaced by at least one spring element and is capable of executing a first partial path for inserting the injection needle and a second partial path for dispensing the active ingredient, such that the at least one spring element is immovable between the transmission part and one with the housing connected support part acts and that the display is connected to the spring element at a point between the two ends of the spring element.
- a transfer part which can be displaced by at least one spring element and is capable of executing a first partial path for inserting the injection needle and a second partial path for dispensing the active substance, the at least one spring element acting between the transfer part and an intermediate part, at least a further spring element acts between the intermediate part and a support part immovably connected to the housing, and the display is connected to the intermediate part.
- This series connection of at least two spring elements with the intermediate part interposed makes it possible to design the path of the display practically freely, so that, for example, auto-injectors can be built with which different syringes, in particular syringes with different amounts of the content, can be used, and at which can consequently also change the path of the syringe plunger required to dispense the amount of medicament present in the syringe.
- a cover which covers the display when the transmission part executes the first partial route.
- a stop limits the tensioning of the further spring to a maximum spring force and the springs are dimensioned such that the maximum spring force of the tensioned further spring corresponds to the instantaneous spring force of the at least one spring after the injection needle has been inserted and before being poured out corresponds to the active ingredient.
- the result of this is that the intermediate part only moves during the second partial route, that is to say only during the distribution of the active ingredient.
- the stop can also be realized in that the further spring is a compression spring that is compressed to its block length.
- a further stop is provided which also limits the relaxation of the additional spring, so that the path covered by the display is fixed. This ensures that the display moves in a defined area regardless of the length of the second partial route. This enables the use of containers with different content volumes.
- the display is ring-shaped. This makes the ad all about
- the at least one spring and the further spring are arranged coaxially and are at least partially telescopically at least in the tensioned state. This enables a space-saving design of the device and, in particular, prevents it from becoming unwieldily long due to the springs interacting with the display.
- a transmission part which can be displaced by at least one spring element which is able to carry out a first partial route for inserting the injection needle and a second partial route for dispensing the active substance, that the display is connected to an intermediate part, which in turn is connected to at least one rolling element, which during the movement of the transmission part between the transmission part and a rolls with the housing immovably connected area.
- the rolling element (s) rolling away cover half the distance that the transmission part covers.
- Toothing that meshes with teeth that are arranged on the transmission part and on the area immovably connected to the housing.
- Another embodiment of the invention provides that the display is located in the rear end area of the device facing away from the injection needle. This arrangement offers good visibility of the display with easy handling of the device, which is usually held by the user with one hand during operation. In this case, the rear end with the display protrudes beyond the user's hand.
- the display is visible from the outside through a transparent or translucent part, this permits a closed construction of the device, in particular without slots and the like, so that the high hygienic requirements customary in this field can be met.
- FIG. 1 shows a longitudinal section through an exemplary embodiment of a car injector according to the invention in the charged state
- FIG. 2 shows a longitudinal section through the auto-injector in the unlocked state, the section plane being rotated by 90 ° with respect to FIG. 1,
- FIG. 3 shows a longitudinal section through the auto-injector after the injection needle has been inserted, the section being made through the same plane as in FIG. 2,
- FIG. 4 shows a longitudinal section through the auto-injector after the medication has been poured out, the section being guided through the same plane as in FIGS. 2 and 3,
- FIG. 5 shows a longitudinal section through the auto-injector after the injection needle has been pulled out, the section being made through the same plane as in FIG. 1, FIG.
- FIGS. 6A to 6C show a first embodiment of a display
- FIGS. 7A to 7C show a second embodiment of a display as it is built into the embodiment of the auto-injector explained with reference to FIGS. 1 to 5.
- FIGS. 8A to 8C show a third embodiment of a display which, like the first and second embodiment, works with spring means
- FIGS. 9A to 9C show a fourth embodiment of a display
- FIGS. 10A to 10C show a fifth embodiment of a display.
- the auto injector consists of two main components, namely the one
- the Reservoir part shown on the left in the figures, which holds a filled syringe and the power pack, shown on the right in the figures, in which the parts which are used for the automatic insertion and discharge of the syringe are accommodated.
- the two main components are detachably connected to one another by a bayonet-like connection between a receiving sleeve 16 and a power sleeve 1.
- the Side of the auto-injector on which the injection needle is located is designated as the front.
- the power pack is first described with reference to FIG. 1, which shows the ready-to-use auto-injector.
- the parts for driving the auto injector are accommodated in the grip sleeve 14, at the rear end of which a display window 51 connects.
- the display window 51 is made of transparent or translucent material or has openings, for example in the form of slots, which make it possible to observe the display 12 displaceably received in the display window 51 from the outside.
- the display 12 is ring-shaped and is therefore visible around the auto-injector from any direction.
- the actuating head 13 is arranged, which is provided on its rear face with a cover plate 15.
- the power sleeve 1 is added.
- the power sleeve 1 is connected to a grid sleeve 8 by means of a snap connection.
- the grid sleeve 8 receives a spring sleeve 10 slidably on the inside.
- the spring sleeve 10 is coupled to the display 12 at the rear by a snap connection.
- the transmission part 5 is slidably mounted in the power sleeve 1.
- the transfer part 5 has the task of actuating the piston rod 52 of the syringe 50 in order to dispense the contents of the syringe, as will be described in more detail later.
- a spring 9 is accommodated in the tensioned state within the spring sleeve 10, which is supported on the spring sleeve 10 at the front and presses against the grid sleeve 8 at the rear.
- a second spring 11 is located, also in the tensioned state, on the outside of the
- Spring sleeve 10 and is supported at the front on the transmission part 5 and presses against the spring sleeve 10 at the rear.
- a part referred to as the piston guide 4 rests with its front, sleeve-shaped end on the collar of the syringe and extends through the transmission part 5, the spring sleeve 10 and the grid sleeve 8 into the area of the actuating head 13.
- the piston guide 4 is supported by a spring 7 biased towards the front, which is supported at the rear on the grid sleeve 8.
- the piston guide 4 At its rear end, the piston guide 4 by two on the Grid sleeve 8 integrally formed locking cams 31 which engage in a groove 32 formed at the rear end of the piston guide 4, held in the position shown in FIG. 1.
- Locking elements for example balls 6, which are received in radial openings 33 of the piston guide 4 and engage in recesses 34 in the transmission part 5, ensure in this operating position that the transmission part 5 and the piston guide 4 can only move together.
- balls 6 other locking elements, for example bolts, could of course also be used.
- the parts for receiving the syringe 50 are accommodated in the receiving sleeve 16, which can be connected to the power sleeve 1 as described.
- a sliding sleeve 21 receives the syringe with the interposition of a needle holder 22.
- the needle holder 22 prevents the injection needle 37 from being pulled off the syringe as long as the latter is in the auto-injector.
- the needle holder 22 lies against a support ring 24 connected to the sliding sleeve 21 at the front.
- a needle holder 22 In the case of syringes and needles with Luerlock couplings, in which the injection needle is connected to the syringe by means of a thread, there is no needle holder 22.
- the sliding sleeve 21 is displaceable within the receiving sleeve 16 and is pressed into the operating position shown in FIG. 1 by a spring 20.
- a sleeve-shaped needle guard 17 is displaceable within the receiving sleeve 16.
- the needle guard 17 is closed at the front by a snap cover 23, which leaves a passage for the injection needle free, and has an inwardly facing flange 35 at its rear end.
- a spring 18 is supported on the snap cover 23 at the front and on a driving ring 19 at the rear, the in turn is held on the support ring 24.
- the spring 18 is in its relaxed state in this figure.
- the autoinjector To prepare for the injection, the autoinjector must be brought from the secured state shown in FIG. 1 to the unlocked state, which is shown in FIG. 2.
- the unlocked state which is shown in FIG. 2.
- Actuating head 13 moved backwards. This can be done by gripping the device with one hand on the receiving sleeve 16 and with the other hand on the actuating head 13 and pulling the two parts apart become. Due to the special design and arrangement of the actuating head 13, it is also possible to hold the auto-injector on the grip sleeve 14 and to push the actuating head 13 backwards with the thumb of the same hand. Circumferential ribs provided on the actuating head 13 can prevent the thumb from sliding off. This pushing back of the actuating head 13 is referred to below as the unlocking movement.
- tongues 36 which are integrally formed on the cover plate 15 of the actuating head 13, move over the locking cams 31 formed on the grid sleeve.
- the tongues and the locking cams are shaped in such a way that the tongues 36 yield radially resiliently during the unlocking movement, while sliding over the ends of the locking cams 31 which hold the piston guide 4 by engaging in the said grooves 32.
- the tongues 36 formed on the cover plate 15 stand like wedges between the latching cams 31.
- a spring 3 is tensioned, which acts between the molded-on sleeve 8 on the locking sleeve 8 and a retaining part 60 fastened in the actuating head with a snap connection, so the 1 and thus ensures that the tongues 36 rest against the locking cams 31 with a slight pretension.
- the auto-injector is now ready for injection and is placed on the patient's skin with the snap-on lid 23 at the desired location. The patient holds the autoinjector on the grip sleeve 14. To trigger the injection, only the actuating head 13 now has to be moved forward, that is, in the direction toward the patient's body.
- Piston guide 4 is released and pushed forward by the force of the spring 7.
- the piercing movement is also supported by the force of the spring 11, which acts on the transmission part 5. Since the transmission part 5 is connected to the piston guide 4 by means of the balls 6, this adds up relatively high initial force of the spring 11 to that of the spring 7 and contributes to the fact that the injection needle is safely advanced to the full penetration depth.
- the force of the springs is also transmitted via the sleeve-shaped front end of the piston guide 4 to the collar of the syringe 50 and pushes it forward together with the sliding sleeve 21 in which it is received, so that the injection needle 37 is advanced and the patient's skin penetrates.
- the sliding sleeve 21 compresses both the spring 20 and - via the driving ring 19 - the spring 18.
- the penetration distance is limited by the shoulder 40 of the piston guide 4 resting on an inner shoulder 41 of the power sleeve 1.
- the openings 33 in the piston guide 4, which receive the balls 6, are aligned with recesses 42, which are provided in the power sleeve 1, the balls 6 can deflect outwards and the coupling between the piston guide 4 and the transmission part 5 is canceled.
- the piston guide 4 is now locked against the power sleeve 1, so that the force of the spring 20 is absorbed by the power sleeve and thus does not counteract the force of the spring 7, which causes the medication to be dispensed.
- the injection can now begin automatically by pushing the piston rod 52 of the syringe further forward through the transmission part 5 under the force of the springs 11 and 9.
- the spring 11 is dimensioned so much stronger than the spring 9 that until this moment of the start of the injection, the spring sleeve 10 and the display 12 connected to it remain in the position shown in FIG. 3, in the area between an outwardly projecting flange the grid sleeve 8 and the spring sleeve 10 a stop is formed.
- the transmission part 5 has covered the path designated 54 in FIG.
- the spring 18 is tensioned by the driving ring 19 moved to the left by the sliding sleeve 21 in the figures.
- the path 56 of the display 12 is independent of the path of the piston rod 52 of the syringe 50 and can be significantly smaller than the path 54 + 55 of the transmission part 5. This on the one hand avoids that the auto-injector is unnecessarily long and on the other hand it can be used to inject syringes different ways can be used.
- This construction also has the additional advantage that the relatively high initial force of the spring 11 is used for the piercing process and then its relatively low final force is used for the injection process, which thus takes place relatively slowly in the desired manner.
- FIGS. 6A to 6C A possible embodiment of the display is illustrated in FIGS. 6A to 6C.
- this structurally simple embodiment does not correspond to that which is installed in the exemplary embodiment of the auto-injector described above, parts with the same function have the same reference numerals.
- FIG. 6A shows the parts in the relative relative position which they occupy in the cocked auto-injector ready for injection. Starting from this position, the transmission part 5 moves to the left, as already described with reference to FIGS. 1 to 5.
- FIGS. 6A to 6C The grid sleeve 8, which is immovably connected to the grip sleeve 14 as described above, maintains its position in FIGS. 6A to 6C.
- Both springs shown namely the spring 9 acting between the grid sleeve 8 and the intermediate part 10 'and the spring 11 acting between the intermediate part 10' and the transmission part 5 are tensioned in the position according to FIG. 6A.
- FIG. 6B shows the position of the parts when the injection needle 37 is inserted Transmission part 5 has shifted the sliding sleeve 21 with the syringe 50 and thereby moved forward by the path 54.
- the intermediate part 10 'with the display 12 has shifted proportionally by an amount which is considerably smaller than the path 54, as can be seen easily in FIG. 6B.
- the spring sleeve 10 and with it the display 12 also moves in proportion to the transmission part 5, specifically around route 59.
- This route 59 of the display 12, which thus illustrates the process of dispensing the medicament, is of particular importance for the patient. If the patient waits to withdraw the auto-injector until the display has reached its end position according to FIG. 6C, it is certainly prevented that part of the medication is lost. If you want to prevent the path that the display travels during the piercing from being visible from the outside, a cover 61 can be provided, which only reveals the view of the display 12 when the pouring process begins.
- FIGS. 7A to 7C show a second embodiment of a display as it is installed in the embodiment of the auto-injector explained with reference to FIGS. 1 to 5.
- the positions of the transmission part are the same as in the preceding FIGS. 6A to 6C, namely in FIG. 7A in a tensioned, ready-to-inject state, in FIG. 7B when the injection needle is inserted and in FIG. 7C when the medication is dispensed.
- the two springs 9 and 11 partially overlap telescopically. This is made possible by the spring sleeve 10 which projects into the spring 11 and receives the spring 9 in its interior.
- the overall length of the auto-injector can be somewhat less than in the display configuration described above.
- Another, more important advantage of this design is that the spring sleeve 10 only begins to move with the display 12 when the injection needle is inserted and the dispensing process begins. This is accomplished as follows. As in the embodiment described above, the springs 9 and 11 are in principle connected in series. But because Clamping force of the spring 9 is limited by the spring sleeve 10 being in contact with the grid sleeve 8 on the right, in the starting position according to FIG. 7A the force of the spring 11 is greater than the force of the spring 9. Starting from this position, the force of the spring 11 drops when it is replaced of path 54, but is provisional
- FIGS. 8A to 8C show a third embodiment of a display. This embodiment, which is very similar to the embodiment shown in Figures 6A to 6C, shows an even simpler solution. Instead of
- the display 12 could consist of a marking on the circumference of the spring 58, which would be attached approximately in the longitudinal center of the spring.
- the display 12 an annular part which is connected to the spring 58, is also preferred in this example. Used to connect the display 12 to the spring 58
- the intermediate part 10 can be connected to the spring 58 in various ways.
- the intermediate part 10 ′′ can be ring-shaped, pushed over the spring 58 and connected to it, for example by gluing. Another connection possibility is to
- the intermediate part 10 could be made of plastic and with the Spring 58 can be connected in an injection mold by part of the
- FIGS. 9A to 9C show a fourth embodiment of a display. Unlike the previously described embodiments, this fourth type is not based on springs, but on rolling elements, as will be explained below. The element from which the movement of the display is derived is again the piston 5 in this example. A part of this is shown schematically in the figures and designated 5 '. For the sake of simplicity, no spring is shown in FIGS. 9A to 9C.
- the movement of the piston 5 for the purpose of piercing the needle and pouring out the active substance is also carried out by means of spring force, as in the previously described embodiments.
- Adjacent to this part 5 ' is another form of the intermediate part, designated 10'"in this example.
- the intermediate part 10 '" extends longitudinally displaceably between the piston 5' and an extension 1 'of the power sleeve 1 or with it immovably connected part.
- the entire path 56, which the intermediate part 10 '' can cover, is limited on the left by the display 12 'resting on the power sleeve 1' and on the right by the display 12 'resting on a part 8' connected to the grid sleeve 8 Cover 61 'can be integrally connected to the last-mentioned part.
- a number of recesses 67 are machined, in which rolling elements 62 are arranged. If the piston 5 'moves to the left during the piercing and in the figures, the rolling elements 62 roll between the power sleeve 1' and the piston 5 ', covering half the distance the piston 5 travels.
- the rolling elements 62 take the intermediate part 10 ′′ and thus of course also the display 12 ′ with them over the walls of the recesses 67.
- the rolling elements 62 can be designed as balls or short cylinders. There are preferably three rows of rolling elements 62 at an angular distance of 120 ° distributed over the circumference of the auto injector.
- FIGS. 10A to 10C show a fifth embodiment of a display which does not have this disadvantage.
- the form fit is achieved by at least one gear 63 which is rotatably mounted in a recess 67 of the intermediate part 10 '"on an axis 64.
- the gear 63 meshes with teeth 65 arranged on the power sleeve 1' and one on the piston 5 ' arranged toothing 66.
- the gear 63 is taken along without slip and in turn takes the intermediate part 10 '" along with it.
- Two or three gear wheels 63 are advantageously arranged distributed over the circumference of the auto-injector.
- the spring tongues protrude beyond the lateral surface of the sliding sleeve 21, as can be seen in FIG. 5.
- the spring 18, which was biased during the puncturing process ensures that the needle guard 17 remains in contact with the patient's skin during the retraction of the auto-injector.
- the needle guard 17 thus moves forward relative to the receiving sleeve 16 until it completely covers the injection needle 37.
- the spring tongues 38 snap behind the flange 35 of the needle guard 17 and prevent it from being pushed back into the receiving sleeve 16. This eliminates any risk of injury from the injection needle.
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- Anesthesiology (AREA)
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- Life Sciences & Earth Sciences (AREA)
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005510210A JP4377880B2 (ja) | 2002-11-25 | 2003-11-17 | 薬剤を自動的に注射するための装置 |
EP03811705A EP1572268A1 (de) | 2002-11-25 | 2003-11-17 | Vorrichtung zum automatischen injizieren eines wirkstoffes |
AU2003275893A AU2003275893B2 (en) | 2002-11-25 | 2003-11-17 | Device for automatically injecting an active agent |
US11/134,044 US7806866B2 (en) | 2002-11-25 | 2005-05-20 | Device for automatically injecting an active agent |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01984/02A CH695926A5 (de) | 2002-11-25 | 2002-11-25 | Vorrichtung zum automatischen Injizieren eines Wirkstoffes. |
CH1984/02 | 2002-11-25 | ||
CH837/03 | 2003-05-13 | ||
CH8372003 | 2003-05-13 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/134,044 Continuation US7806866B2 (en) | 2002-11-25 | 2005-05-20 | Device for automatically injecting an active agent |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004047890A1 true WO2004047890A1 (de) | 2004-06-10 |
Family
ID=32394667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH2003/000755 WO2004047890A1 (de) | 2002-11-25 | 2003-11-17 | Vorrichtung zum automatischen injizieren eines wirkstoffes |
Country Status (5)
Country | Link |
---|---|
US (1) | US7806866B2 (de) |
EP (1) | EP1572268A1 (de) |
JP (1) | JP4377880B2 (de) |
AU (1) | AU2003275893B2 (de) |
WO (1) | WO2004047890A1 (de) |
Cited By (53)
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Also Published As
Publication number | Publication date |
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AU2003275893B2 (en) | 2008-11-13 |
JP4377880B2 (ja) | 2009-12-02 |
US20050277886A1 (en) | 2005-12-15 |
AU2003275893A1 (en) | 2004-06-18 |
JP2006507103A (ja) | 2006-03-02 |
US7806866B2 (en) | 2010-10-05 |
EP1572268A1 (de) | 2005-09-14 |
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