US20070065319A1 - Device for Controlled Delivery of an Injectable Liquid - Google Patents
Device for Controlled Delivery of an Injectable Liquid Download PDFInfo
- Publication number
- US20070065319A1 US20070065319A1 US11/550,176 US55017606A US2007065319A1 US 20070065319 A1 US20070065319 A1 US 20070065319A1 US 55017606 A US55017606 A US 55017606A US 2007065319 A1 US2007065319 A1 US 2007065319A1
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- United States
- Prior art keywords
- piston
- liquid
- container
- drive wheel
- drive mechanism
- Prior art date
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- Abandoned
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Classifications
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- 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
- A61M5/31576—Constructional features or modes of drive mechanisms for piston rods
- A61M5/31583—Constructional features or modes of drive mechanisms for piston rods based on rotational translation, i.e. movement of piston rod is caused by relative rotation between the user activated actuator and the 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
- A61M5/31—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
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31545—Setting modes for dosing
- A61M5/31548—Mechanically operated dose setting member
- A61M5/3155—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe
- A61M5/31553—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe without axial movement of dose setting member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G1/00—Spring motors
- F03G1/02—Spring motors characterised by shape or material of spring, e.g. helical, spiral, coil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/04—Wound springs
- F16F1/10—Spiral springs with turns lying substantially in plane surfaces
-
- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/58—Means for facilitating use, e.g. by people with impaired vision
- A61M2205/581—Means for facilitating use, e.g. by people with impaired vision by audible feedback
-
- 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
-
- 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
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31545—Setting modes for dosing
- A61M5/31548—Mechanically operated dose setting member
- A61M5/3156—Mechanically operated dose setting member using volume steps only adjustable in discrete intervals, i.e. individually distinct intervals
-
- 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
- A61M5/3159—Dose expelling manners
- A61M5/31593—Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir
Definitions
- the present invention relates to devices for delivering, dispensing, injecting, administering or infusion substances, and to methods of making and using such devices. More particularly, it relates to a device for the controlled delivery of an injectable liquid, in one embodiment, from a preferably substantially cylindrical liquid container. More particularly, the present invention relates to an injection device for administering a liquid containing a therapeutic or medical active agent, for example insulin for the treatment of diabetes, from a syringe body.
- a therapeutic or medical active agent for example insulin for the treatment of diabetes
- Injection devices of the aforementioned type are known for example from WO 95/09021.
- a syringe body for storing the liquid to be administered is sealed off at a rear end by a piston which can be slid axially in the syringe body, the liquid being delivered from an outlet at the front end of the syringe body when the piston is advanced towards the outlet.
- the overall length must correspond to at least twice the maximum stroke of the piston which can be slid in the syringe body, the overall length can be reduced in injection devices of the aforementioned type by axially deviating a piston rod behind the syringe body, which drives the piston, away from its longitudinal axis. This is in particular advantageous in portable injection devices for autotherapy.
- WO 95/09021 discloses a substantially incompressible, flexible piston rod which is tightly guided in a guide in order to prevent the piston rod from bending laterally away from its longitudinal axis.
- the piston is advanced by controlled rotation of a threaded rod, the rotational movement being converted into an advancing movement by means of a rotationally fixed but longitudinally slidable nut which engages with the outer thread of the threaded rod and is connected to the rear end of the flexible piston rod.
- This mechanism is hardly suitable for hand-operated injection devices without an energy supply of their own.
- the drive mechanism is comparatively elaborate.
- WO 98/57688 An injection device operating according to the aforementioned basic principle is disclosed in WO 98/57688.
- a downward movement of a first gear rack is converted into an upward movement of a second gear rack which is coupled to a flexible piston rod.
- a stopper is adjusted within an adjustment range defined by maximum end positions, in order to set the dosage to be administered.
- the second gear rack can be maximally slid only by the distance pre-set by the stopper.
- a first spring is provided to reset the operating button, and a second spring which is provided in a dosage setting mechanism. The two springs are not coupled to the drive mechanism, in order to reset the latter and advance the piston for delivering liquid from the syringe body.
- the mechanism disclosed in WO 98/57688 can be operated by hand, it has a comparatively elaborate design.
- a device for the controlled delivery of an injectable liquid from a liquid container which is sealed off at a rear end by a piston which can be slid axially in said container in order to deliver the liquid from an outlet at a front end of the container comprising, in one embodiment, a flexible force transferring means which is axially deviated, behind the container, away from the longitudinal axis of the container; a drive mechanism which is coupled to said flexible force transferring means, in order to axially advance the piston for delivering the liquid; and a restoring means, wherein said restoring means applies a restoring force to said drive mechanism and resets it for delivering liquid from the container, in order to advance the piston via the flexible force transferring means.
- the present invention comprises a device for the controlled delivery of an injectable liquid from a liquid container wherein: a flexible force transferring means transfers a drive force of a rotatable drive wheel onto a piston which can be slid axially in the device, a restoring force of a spring is applied to the drive wheel to move the piston, and a locking means locks the drive wheel against rotation and releases the drive wheel for rotation.
- the amount of liquid expelled may be indicated by audible clicks and, in one embodiment, the drive wheel moves incrementally when the locking means releases the drive wheel.
- the present invention comprises a device for the controlled delivery of an injectable liquid from a liquid container wherein: a flexible force transferring means transfers the drive force of a drive wheel onto a piston which can be slid axially in the device, a preferably permanently acting restoring force of a spiral spring is applied to the drive wheel in order to advance the piston and expel the liquid, and a locking means locks the drive wheel against rotation and releases the drive wheel to expel the liquid.
- the amount of liquid expelled can be indicated by audible clicks and, in one embodiment, the drive wheel moves only incrementally when the locking mechanism releases the drive wheel.
- the drive mechanism serving to advance the piston is coupled to a restoring means which resets it for delivering liquid from the container, in order to advance the piston via the flexible force transferring means.
- the restoring means is characterized by a restoring force which applies a restoring force to the drive mechanism.
- the restoring force is preferably characterized by a preferential direction in which it resets the drive mechanism into an end position in which the restoring force is negligible and the drive mechanism no longer continues driving.
- the end position of the restoring means preferably corresponds to a front end position of the piston, where the piston is situated substantially at the front end of the liquid container.
- the drive mechanism is not driven by the restoring means. This ensures that, once the restoring force has been released, the piston is driven towards the outlet of the liquid container.
- restoring means can be realized simply, for example by means of pressure or tension springs or coil springs for generating a rotational restoring force.
- the restoring force can also be generated in other ways, for example electrically, magnetically or pneumatically.
- the restoring force is permanently applied to the drive mechanism, in which case only a simple release mechanism is provided to release the restoring force for advancing the piston in the liquid container.
- an adjustable, mechanical locking means for a controlled release of the restoring force and to lock against angular adjustment of the drive wheel, except when the locking means releases the rotational movement of the drive wheel.
- Mechanical locking means can advantageously be realized in a simple way by means of blocking pins, teeth or comparable latching protrusion and latching recesses.
- the present invention is not, however, in principle restricted to mechanical locking means. Rather, the restoring force can also be released and/or blocked by electrical, magnetic or pneumatic means.
- the locking means is configured as a simple rocking lever which is moved to a releasing position, in which the drive mechanism is released, by advancing an operating button, and can be reset into a locking position, in which the drive mechanism is locked, by a second restoring means.
- the rocking lever, or elements cooperating with it comprises a mechanical blocking means, for example a blocking projection, which cooperates with a corresponding mechanical blocking means, for example a teeth on a lateral facing area of the drive wheel.
- FIG. 1 depicts an injection device in accordance with one embodiment of the present invention, with the upper half-casing removed, in a perspective top view;
- FIG. 2 depicts the device in accordance with FIG. 1 , with the upper half-casing removed, in a top view;
- FIG. 3 depicts the device in accordance with FIG. 1 , from the rear side, without the outer half-casings, in a perspective view;
- FIG. 4 depicts the device in accordance with FIG. 1 , from the rear side, without the outer half-casings, in a top view;
- FIG. 5 depicts an injection device in accordance with another embodiment of the present invention, with the upper half-casing removed, in a perspective top view;
- FIG. 6 depicts the device in accordance with FIG. 5 , with the upper half-casing removed, in a schematic top view.
- identical reference numerals indicate substantially identical or substantially functionally identical elements and sub-assemblies.
- FIG. 1 shows a perspective top view of one embodiment of an injection device in accordance with the invention, with the upper half-casing removed.
- the injection device comprises a substantially cylindrical syringe body 1 which serves to store the liquid to be administered, which preferably contains a therapeutic or medical active agent, for example insulin for treating diabetes.
- the syringe body 1 is sealed off at its rear end 4 by a piston (not shown) and comprises an injection needle 3 including a needle support 2 at its front end, said needle support being connected to the syringe body 1 .
- the piston can be slid axially in the syringe body and delivers liquid from the injection needle 3 when it is advanced towards the front end 2 .
- a flexible force transferring means 5 is provided for advancing the piston, wherein the front end of said force transferring means 5 abuts the piston (not shown) or is connected to it, preferably detachably.
- the force transferring means 5 is preferably incompressible and consists of a plastic or metal or comparable materials. As shown in FIG. 1 , the force transferring means 5 is axially deviated, behind the syringe body 1 , away from the longitudinal axis of the syringe body 1 , such that the overall length of the injection device shown can be reduced as compared to conventional injection devices.
- the force transferring means 5 is coupled, preferably fastened, to the drive wheel 8 which serves as the drive mechanism, and serves to transfer the drive force generated by the drive mechanism 8 onto the piston (not shown), in order to advance the latter into the syringe body 1 .
- the drive wheel 8 is substantially circular and comprises an outer toothed area 27 in a first half on a lateral facing side and the fastening region 7 , for coupling the force transferring means 5 to the drive wheel 8 , in a second half opposite the outer area 27 .
- the drive wheel 8 comprises a handle 19 on its upper side, wherein said handle protrudes through the upper half-casing (not shown) of the injection device and can be operated from the outer side of the casing.
- the grip 19 serves to rotate the drive wheel 8 , in particular to reset the drive wheel 8 against the restoring force of the spiral spring 10 shown in FIGS. 3 and 4 , which serves as the restoring means.
- the flexible force transferring means 5 either directly abuts the outer circumference of the drive wheel 8 or abuts a stay corresponding to the outer contour of the drive wheel 8 , said stay protruding substantially perpendicularly from the lower half-casing 21 .
- the flexible force transferring means 5 abuts the stay 20 projecting substantially perpendicularly from the lower half-casing 21 .
- a guiding area is provided in the lower half-casing 21 in the region between the outer circumference of the drive wheel 8 or the radially inner stay (not shown) and the radially outer stay 20 , as well as correspondingly in the upper half-casing (not shown), the flexible force transferring means 5 substantially abutting said guiding area.
- the stays and the guiding areas form a guide which tightly abuts the force transferring means, said guide preventing or at least as far as possible inhibiting the force transferring means from bending laterally, away from its longitudinal axis.
- FIGS. 3 and 4 which show the first embodiment from the rear side in a perspective top view ( FIG. 3 ) and a schematic top view ( FIG. 4 ) with the lower half-casing 21 removed, show how a spiral spring 10 serving as the restoring means is connected to the drive wheel 8 .
- a spiral spring 10 serving as the restoring means is connected to the drive wheel 8 .
- the spring 10 biases the drive wheel 8 against the half-casings of the injection device.
- the bias force can be achieved by reversing the handle 19 ( FIG. 1 ) or using motors.
- the bias force is preferably of such a magnitude that the piston can be advanced between its rear end position, i.e., substantially the rear end 4 of the syringe body 1 , and its front end position, i.e., substantially the front end 2 of the syringe body 1 , due to the restoring force of the spring 10 .
- the restoring means does not necessarily need to be directly connected to the drive wheel 8 , but can also, for example, act on its rotational mount in order to reverse it in the advancing direction of the piston.
- the spiral spring 10 shown in FIGS. 3 and 4 permanently applies the restoring force to the drive wheel 8 .
- the present invention is not, however, restricted to a permanently acting restoring force.
- a locking means is provided, in particular in embodiments with a permanently acting restoring force.
- the locking means is formed by a rocking lever 14 which supports a blocking projection 15 at its front end, wherein said blocking projection 15 is formed to correspond to the outer teeth or toothed area 27 and cooperates with the same, such that the drive wheel 8 is prevented from being turned further due to the permanently acting restoring force.
- the rocking lever 14 pivots about the rotational point 16 ( FIG. 2 ) between the locking position shown in FIGS. 1 to 4 , in which the engagement between the blocking projection 15 and the outer toothed area 27 locks against angular adjustment of the drive wheel 8 , and a releasing position in which the blocking projection 15 releases the engagement with the outer area 27 such that the drive wheel 8 is rotated in the advancing direction of the piston, i.e. in FIG. 1 , anti-clockwise, due to the restoring force of the spring 10 .
- the rocking lever 14 is connected via the joint 17 to the operating button 13 which is linearly guided in lateral stays 23 of the lower half-casing 21 and can be pushed into the casing of the injection device.
- a leaf spring 18 serving as a second restoring means acts on the rocking lever 14 in order to reverse it into the locking position.
- the maximum piston stroke of the piston between the rear end 4 and the front end 2 of the syringe body 1 corresponds to an angular adjustment of the drive wheel 8 , defined substantially by the radius of the guide 20 for the flexible force transferring means 5 .
- Stoppers are preferably provided in the casing and/or on the drive wheel 8 and/or on the flexible force transferring means 5 , and limit the angular adjustment of the drive wheel 8 in its two end positions.
- the maximum piston stroke of the piston in the syringe body 1 corresponds to the bending radius of the flexible force transferring means 5 multiplied by the number pi. The piston is thus slid between its rear and front end position by half a revolution of the drive wheel 8 .
- the outer toothed area 27 can be arranged in a first half of the drive wheel 8 , while the fastening region 7 , in the rear end position of the piston in the syringe body 1 , is substantially arranged diametrically opposite the rear end 4 of the syringe body 1 .
- the present invention is not, however, restricted to the aforementioned dimensions.
- the front end 24 of the lower half-casing 21 and/or the corresponding front end of the upper half-casing can be removable, in order to make the syringe body 1 fully accessible for exchanging.
- the front end 24 comprises a bearing area 25 on its inner side, said bearing area 25 being formed to correspond exactly to the outer contour of the syringe body 1 , in order to securely store it.
- the rear end 4 of the syringe body 1 comprises the flattened portion 29 visible in FIGS. 2, 3 and 5 .
- the piston of the syringe body 1 can be retracted by reversing the drive wheel 8 against the restoring force of the spring 10 .
- the syringe body 1 can then be removed from the casing.
- the injection device may be operated as follows: the flexible force transferring means 5 is retracted by reversing the drive wheel 8 , clockwise in FIG. 1 .
- the piston (not shown) can also be moved to its rear end position near the rear end 4 of the syringe body 1 .
- the syringe body 1 can be replaced with a new syringe body.
- the flexible force transferring means 5 is then moved back to abut the piston or is connected to it.
- the piston is then sufficiently advanced, for example to prime the syringe body.
- the blocking projection 15 engages with the outer toothed area 27 of the drive wheel 8 and locks against its angular adjustment.
- the front end of the operating button 13 protrudes out of the lower half-casing 21 .
- Pushing the operating button 13 into the casing releases the blocking projection 15 from the outer toothed area 27 , such that there is a controlled release of the restoring force by the locking means. Lastly, the engagement between the blocking projection 15 and the outer toothed area 27 is completely or substantially completely released. Due to the restoring force of the spring 10 , the drive wheel 8 then turns, anti-clockwise in FIG. 1 , and thereby slaves the flexible force transferring means 5 connected to the drive wheel 8 in the region 7 . The front end of the flexible and incompressible force transferring means 5 , guided in the guide 20 , is thus axially advanced in the syringe body 1 and thereby slaves the piston stopper, such that liquid is delivered from the injection needle 3 .
- the blocking projection 15 shown in the figures is also suitable as an obstacle, providing the distance between the blocking projection 15 and the teeth of the outer toothed area 27 is sufficiently small in the releasing position of the rocking lever 14 that on the one hand the blocking projection 15 and the outer toothed area 27 abut, but on the other this does not prevent the drive wheel 8 from turning further.
- the restoring force of the spring 10 serving as the restoring means can be adjusted to the flow resistance of the liquid as it is delivered from the syringe body 1 , such that there remains enough time for the user to count out the clicks and so work out the dosage of liquid actually delivered.
- the rocking lever 14 is reset into the locking position. Because the steep flanks of the serrated-toothed outer toothed area 27 each lie on the side of the tooth flanks of the outer toothed area 27 lying in the restoring direction, the correspondingly formed blocking projection 15 is automatically returned to the locking position as soon as a front end of the blocking projection 15 comes to abut one of the tooth flanks of the outer toothed area 27 . The expulsion of liquid is thus automatically terminated when the user lets go of the operating button 13 .
- the locking means is configured, in another embodiment shown in FIGS. 5 and 6 , such that the piston can only be moved a fraction of the maximum piston stroke pre-set by the front and rear end positions of the piston in the syringe body 1 .
- identical reference numerals in FIGS. 5 and 6 indicate identical components and functional groups, such that a description of them is omitted below for reasons of clarity.
- FIGS. 5 and 6 show a second embodiment of the injection device in accordance with the invention from above, with the upper half-casing removed, in a perspective top view and a schematic top view.
- the rocking lever 14 as a whole is formed substantially L-shaped.
- the upper limb of the rocking lever 14 is jointed via a joint 17 coupled to the operating button 13 .
- the lower limb of the rocking lever 14 comprises two blocking projections 30 , 31 arranged on opposite sides of the rotational point 16 of the rocking lever 14 , which are each formed to correspond to the teeth of the outer toothed area 27 of the drive wheel 8 , but which, as can be seen in FIG.
- the first blocking projection 30 engages with the outer toothed area 27 and locks against angular adjustment of the drive wheel 8 . If the operating button 13 is then pushed down into the casing, the rocking lever 14 is pivoted about the rotational point 16 such that the first blocking projection 30 is released from its engagement with the outer toothed area 27 and the second blocking projection 31 is moved to the middle of the opposite tooth flank of the outer toothed area 27 . Lastly, the second blocking projection 31 comes to abut the opposite tooth flank. If the operating button 13 is pushed further down, the second blocking projection 31 slides off, ultimately completely, on the opposite tooth flank and engages, ultimately completely, with the outer toothed area 27 .
- the first blocking projection 30 is preferably completely out of engagement with the outer toothed area 27 and the drive wheel 8 has turned further by half a tooth flank, anti-clockwise in FIG. 6 .
- This rotational movement of the drive wheel 8 is assisted by the restoring force, acting in the same direction, of the spiral spring 10 serving as the restoring means (see FIGS. 3, 4 ).
- the user then lets go of the operating button 13 again. Due to the restoring force of the leaf spring 18 , serving as the second restoring means and abutting the rocking lever 14 in the region of the first blocking projection 30 , and of a spring (not shown) which pushes the operating button 13 back out of the casing of the injection device, the second blocking projection 31 is gradually released from its engagement with the outer toothed area 27 and the first blocking projection 30 is moved back into engagement with the outer toothed area 27 .
- the first blocking projection 30 slides off, ultimately completely, on the tooth flank opposite it until the first blocking projection 30 engages, ultimately completely, with the outer toothed area 27 and locks against further angular adjustment of the drive wheel 8 .
- the drive wheel 8 when the operating button 13 is operated once, the drive wheel 8 is turned further by exactly one tooth flank of the outer toothed area 27 . This corresponds to a minimum amount of liquid which can be dosed by the injection device.
- Operating the operating button 13 is easily tangible. The user can thus easily set the dosage of liquid actually delivered by simply counting the number of times, however often, the operating button 13 is operated.
- clicks can again be generated, as described above, such that the user can also select or calculate the dosage of liquid by sound.
- the flexible force transferring means 5 is preferably a cylindrical coil spring made of round wires having a constant diameter.
- the cylindrical cross-section of coil springs enables them to be guided easily, for example using the stays 20 shown in the figures, which project substantially perpendicularly from the lower or upper half-casing, or using comparable guiding means.
- metallic coil springs slide on the guiding stays described above, preferably formed from plastic, with comparatively little resistance.
- the flexible force transferring means can also be made from plastic, for example in the form of an articulated plastic band such as is disclosed in WO 98/01173, the content of which is expressly incorporated herein by way of reference.
- the drive wheel 8 can also be latched in ways other than using the outer toothed area 27 and the blocking projection 15 which cooperates with it.
- Suitable teeth, texture or latching protrusions can, for example, be provided on an upper side of the drive wheel 8 or on a disc or the like coupled to a drive axle of the drive wheel 8 , in order to cooperate with latching protrusions or the like of a locking means. Suitable measures will become clear to the person skilled in the art when studying this application.
- a preferred application of the injection device in accordance with the invention is the injection of insulin into subcutaneous fatty tissue, for treating diabetes.
- the invention is not, however, restricted to this application.
Abstract
A device for the controlled delivery of an injectable liquid from a liquid container, wherein a flexible force transferor transfers the drive force of a drive wheel onto a piston which can be slid axially in the device, a permanently acting restoring force of a spiral spring is applied to the drive wheel to advance the piston and expel the liquid, and a lock locks the drive wheel against rotation and releases the drive wheel to expel the liquid. In one embodiment, the amount of liquid expelled can be indicated by audible clicks and, in one embodiment, the drive wheel moves only incrementally when the lock releases the drive wheel.
Description
- This application is a continuation of U.S. application Ser. No. 10/650,521, filed on Aug. 28, 2003, which claims priority to German Application No. 102 40 166.7, filed on Aug. 30, 2002, the contents of which are incorporated in their entirety by reference herein.
- The present invention relates to devices for delivering, dispensing, injecting, administering or infusion substances, and to methods of making and using such devices. More particularly, it relates to a device for the controlled delivery of an injectable liquid, in one embodiment, from a preferably substantially cylindrical liquid container. More particularly, the present invention relates to an injection device for administering a liquid containing a therapeutic or medical active agent, for example insulin for the treatment of diabetes, from a syringe body.
- Injection devices of the aforementioned type are known for example from WO 95/09021. A syringe body for storing the liquid to be administered is sealed off at a rear end by a piston which can be slid axially in the syringe body, the liquid being delivered from an outlet at the front end of the syringe body when the piston is advanced towards the outlet. While in conventional injection devices comprising syringe bodies, the overall length must correspond to at least twice the maximum stroke of the piston which can be slid in the syringe body, the overall length can be reduced in injection devices of the aforementioned type by axially deviating a piston rod behind the syringe body, which drives the piston, away from its longitudinal axis. This is in particular advantageous in portable injection devices for autotherapy.
- WO 95/09021 discloses a substantially incompressible, flexible piston rod which is tightly guided in a guide in order to prevent the piston rod from bending laterally away from its longitudinal axis. The piston is advanced by controlled rotation of a threaded rod, the rotational movement being converted into an advancing movement by means of a rotationally fixed but longitudinally slidable nut which engages with the outer thread of the threaded rod and is connected to the rear end of the flexible piston rod. This mechanism is hardly suitable for hand-operated injection devices without an energy supply of their own. In addition, the drive mechanism is comparatively elaborate.
- An injection device operating according to the aforementioned basic principle is disclosed in WO 98/57688. When an operating button is depressed, a downward movement of a first gear rack is converted into an upward movement of a second gear rack which is coupled to a flexible piston rod. By rotating a dosage setting wheel, a stopper is adjusted within an adjustment range defined by maximum end positions, in order to set the dosage to be administered. The second gear rack can be maximally slid only by the distance pre-set by the stopper. Furthermore, a first spring is provided to reset the operating button, and a second spring which is provided in a dosage setting mechanism. The two springs are not coupled to the drive mechanism, in order to reset the latter and advance the piston for delivering liquid from the syringe body. Although the mechanism disclosed in WO 98/57688 can be operated by hand, it has a comparatively elaborate design.
- It is an object of the present invention to provide a generic device comprising a simpler mechanism which is hand-operable.
- This object is addressed by a device for the controlled delivery of an injectable liquid from a liquid container which is sealed off at a rear end by a piston which can be slid axially in said container in order to deliver the liquid from an outlet at a front end of the container, the device comprising, in one embodiment, a flexible force transferring means which is axially deviated, behind the container, away from the longitudinal axis of the container; a drive mechanism which is coupled to said flexible force transferring means, in order to axially advance the piston for delivering the liquid; and a restoring means, wherein said restoring means applies a restoring force to said drive mechanism and resets it for delivering liquid from the container, in order to advance the piston via the flexible force transferring means.
- In one embodiment, the present invention comprises a device for the controlled delivery of an injectable liquid from a liquid container wherein: a flexible force transferring means transfers a drive force of a rotatable drive wheel onto a piston which can be slid axially in the device, a restoring force of a spring is applied to the drive wheel to move the piston, and a locking means locks the drive wheel against rotation and releases the drive wheel for rotation. In one embodiment, the amount of liquid expelled may be indicated by audible clicks and, in one embodiment, the drive wheel moves incrementally when the locking means releases the drive wheel.
- In one embodiment, the present invention comprises a device for the controlled delivery of an injectable liquid from a liquid container wherein: a flexible force transferring means transfers the drive force of a drive wheel onto a piston which can be slid axially in the device, a preferably permanently acting restoring force of a spiral spring is applied to the drive wheel in order to advance the piston and expel the liquid, and a locking means locks the drive wheel against rotation and releases the drive wheel to expel the liquid. In one embodiment, the amount of liquid expelled can be indicated by audible clicks and, in one embodiment, the drive wheel moves only incrementally when the locking mechanism releases the drive wheel.
- In accordance with the invention, the drive mechanism serving to advance the piston is coupled to a restoring means which resets it for delivering liquid from the container, in order to advance the piston via the flexible force transferring means. The restoring means is characterized by a restoring force which applies a restoring force to the drive mechanism. Thus, in accordance with the invention, a separate drive motor for advancing the piston is not required, nor is a complicated mechanism, for example a gear mechanism, to convert a drive force of the drive motor into an advancement of the piston.
- For delivering liquid, it is only necessary in accordance with the invention to release the restoring force of the restoring means, which can be achieved by a simple release mechanism.
- In one embodiment, the restoring force is preferably characterized by a preferential direction in which it resets the drive mechanism into an end position in which the restoring force is negligible and the drive mechanism no longer continues driving. The end position of the restoring means preferably corresponds to a front end position of the piston, where the piston is situated substantially at the front end of the liquid container.
- In the direction opposite to the aforementioned preferential direction, by contrast, the drive mechanism is not driven by the restoring means. This ensures that, once the restoring force has been released, the piston is driven towards the outlet of the liquid container.
- Another advantage is that restoring means can be realized simply, for example by means of pressure or tension springs or coil springs for generating a rotational restoring force. In principle, the restoring force can also be generated in other ways, for example electrically, magnetically or pneumatically.
- In some preferred embodiments, the restoring force is permanently applied to the drive mechanism, in which case only a simple release mechanism is provided to release the restoring force for advancing the piston in the liquid container.
- In some preferred embodiments, an adjustable, mechanical locking means is provided, for a controlled release of the restoring force and to lock against angular adjustment of the drive wheel, except when the locking means releases the rotational movement of the drive wheel. Mechanical locking means can advantageously be realized in a simple way by means of blocking pins, teeth or comparable latching protrusion and latching recesses. The present invention is not, however, in principle restricted to mechanical locking means. Rather, the restoring force can also be released and/or blocked by electrical, magnetic or pneumatic means.
- One simple embodiment results if the locking means is configured as a simple rocking lever which is moved to a releasing position, in which the drive mechanism is released, by advancing an operating button, and can be reset into a locking position, in which the drive mechanism is locked, by a second restoring means. The rocking lever, or elements cooperating with it, comprises a mechanical blocking means, for example a blocking projection, which cooperates with a corresponding mechanical blocking means, for example a teeth on a lateral facing area of the drive wheel.
- Embodiments of the present invention, including preferred embodiments, will now be described by way of example and by referring to the accompanying drawings.
-
FIG. 1 depicts an injection device in accordance with one embodiment of the present invention, with the upper half-casing removed, in a perspective top view; -
FIG. 2 depicts the device in accordance withFIG. 1 , with the upper half-casing removed, in a top view; -
FIG. 3 depicts the device in accordance withFIG. 1 , from the rear side, without the outer half-casings, in a perspective view; -
FIG. 4 depicts the device in accordance withFIG. 1 , from the rear side, without the outer half-casings, in a top view; -
FIG. 5 depicts an injection device in accordance with another embodiment of the present invention, with the upper half-casing removed, in a perspective top view; -
FIG. 6 depicts the device in accordance withFIG. 5 , with the upper half-casing removed, in a schematic top view. - In the figures, identical reference numerals indicate substantially identical or substantially functionally identical elements and sub-assemblies.
-
FIG. 1 shows a perspective top view of one embodiment of an injection device in accordance with the invention, with the upper half-casing removed. The injection device comprises a substantiallycylindrical syringe body 1 which serves to store the liquid to be administered, which preferably contains a therapeutic or medical active agent, for example insulin for treating diabetes. Thesyringe body 1 is sealed off at itsrear end 4 by a piston (not shown) and comprises aninjection needle 3 including aneedle support 2 at its front end, said needle support being connected to thesyringe body 1. The piston can be slid axially in the syringe body and delivers liquid from theinjection needle 3 when it is advanced towards thefront end 2. - In one embodiment, a flexible
force transferring means 5 is provided for advancing the piston, wherein the front end of said force transferring means 5 abuts the piston (not shown) or is connected to it, preferably detachably. The force transferring means 5 is preferably incompressible and consists of a plastic or metal or comparable materials. As shown inFIG. 1 , the force transferring means 5 is axially deviated, behind thesyringe body 1, away from the longitudinal axis of thesyringe body 1, such that the overall length of the injection device shown can be reduced as compared to conventional injection devices. In theregion 7, theforce transferring means 5 is coupled, preferably fastened, to thedrive wheel 8 which serves as the drive mechanism, and serves to transfer the drive force generated by thedrive mechanism 8 onto the piston (not shown), in order to advance the latter into thesyringe body 1. - The
drive wheel 8 is substantially circular and comprises anouter toothed area 27 in a first half on a lateral facing side and thefastening region 7, for coupling the force transferring means 5 to thedrive wheel 8, in a second half opposite theouter area 27. Thedrive wheel 8 comprises ahandle 19 on its upper side, wherein said handle protrudes through the upper half-casing (not shown) of the injection device and can be operated from the outer side of the casing. Thegrip 19 serves to rotate thedrive wheel 8, in particular to reset thedrive wheel 8 against the restoring force of thespiral spring 10 shown inFIGS. 3 and 4 , which serves as the restoring means. - Radially inwardly, the flexible force transferring means 5 either directly abuts the outer circumference of the
drive wheel 8 or abuts a stay corresponding to the outer contour of thedrive wheel 8, said stay protruding substantially perpendicularly from the lower half-casing 21. Radially outwardly, the flexible force transferring means 5 abuts thestay 20 projecting substantially perpendicularly from the lower half-casing 21. Furthermore, a guiding area is provided in the lower half-casing 21 in the region between the outer circumference of thedrive wheel 8 or the radially inner stay (not shown) and the radiallyouter stay 20, as well as correspondingly in the upper half-casing (not shown), the flexible force transferring means 5 substantially abutting said guiding area. Together, the stays and the guiding areas form a guide which tightly abuts the force transferring means, said guide preventing or at least as far as possible inhibiting the force transferring means from bending laterally, away from its longitudinal axis. -
FIGS. 3 and 4 , which show the first embodiment from the rear side in a perspective top view (FIG. 3 ) and a schematic top view (FIG. 4 ) with the lower half-casing 21 removed, show how aspiral spring 10 serving as the restoring means is connected to thedrive wheel 8. At the radially outer end of thespiral spring 10, one end of the spring, bent away at a right angle, is hung in afirst fastening point 11, while at the radially inner end of thespring 10, a section of the spring, bent away substantially at a right angle, is hung in a radiallyinner fastening point 12. One of the twofastening points drive wheel 8. Thus, thespring 10 biases thedrive wheel 8 against the half-casings of the injection device. The bias force can be achieved by reversing the handle 19 (FIG. 1 ) or using motors. In some embodiments, the bias force is preferably of such a magnitude that the piston can be advanced between its rear end position, i.e., substantially therear end 4 of thesyringe body 1, and its front end position, i.e., substantially thefront end 2 of thesyringe body 1, due to the restoring force of thespring 10. - Another suitable restoring means can be used instead of the spiral spring shown in
FIGS. 3 and 4 . The restoring means does not necessarily need to be directly connected to thedrive wheel 8, but can also, for example, act on its rotational mount in order to reverse it in the advancing direction of the piston. - The
spiral spring 10 shown inFIGS. 3 and 4 permanently applies the restoring force to thedrive wheel 8. The present invention is not, however, restricted to a permanently acting restoring force. For locking against angular adjustment of thedrive wheel 8, a locking means is provided, in particular in embodiments with a permanently acting restoring force. In accordance with FIGS. 1 to 4, the locking means is formed by a rockinglever 14 which supports a blockingprojection 15 at its front end, wherein said blockingprojection 15 is formed to correspond to the outer teeth ortoothed area 27 and cooperates with the same, such that thedrive wheel 8 is prevented from being turned further due to the permanently acting restoring force. - The rocking
lever 14 pivots about the rotational point 16 (FIG. 2 ) between the locking position shown in FIGS. 1 to 4, in which the engagement between the blockingprojection 15 and the outertoothed area 27 locks against angular adjustment of thedrive wheel 8, and a releasing position in which the blockingprojection 15 releases the engagement with theouter area 27 such that thedrive wheel 8 is rotated in the advancing direction of the piston, i.e. inFIG. 1 , anti-clockwise, due to the restoring force of thespring 10. - The rocking
lever 14 is connected via the joint 17 to theoperating button 13 which is linearly guided in lateral stays 23 of the lower half-casing 21 and can be pushed into the casing of the injection device. At the other end of the rockinglever 14, on the side of therotational point 16 opposite the joint 17, aleaf spring 18 serving as a second restoring means acts on the rockinglever 14 in order to reverse it into the locking position. - In the injection device shown, in one embodiment, the maximum piston stroke of the piston between the
rear end 4 and thefront end 2 of thesyringe body 1 corresponds to an angular adjustment of thedrive wheel 8, defined substantially by the radius of theguide 20 for the flexible force transferring means 5. Stoppers (not shown) are preferably provided in the casing and/or on thedrive wheel 8 and/or on the flexible force transferring means 5, and limit the angular adjustment of thedrive wheel 8 in its two end positions. Preferably, the maximum piston stroke of the piston in thesyringe body 1 corresponds to the bending radius of the flexible force transferring means 5 multiplied by the number pi. The piston is thus slid between its rear and front end position by half a revolution of thedrive wheel 8. Thus, in the embodiment shown in FIGS. 1 to 4, the outertoothed area 27 can be arranged in a first half of thedrive wheel 8, while thefastening region 7, in the rear end position of the piston in thesyringe body 1, is substantially arranged diametrically opposite therear end 4 of thesyringe body 1. The present invention is not, however, restricted to the aforementioned dimensions. - In order to even more flexibly exchange the
syringe body 1, thefront end 24 of the lower half-casing 21 and/or the corresponding front end of the upper half-casing (not shown) can be removable, in order to make thesyringe body 1 fully accessible for exchanging. In some preferred embodiments, thefront end 24 comprises abearing area 25 on its inner side, said bearingarea 25 being formed to correspond exactly to the outer contour of thesyringe body 1, in order to securely store it. In order to insert thesyringe body 1 into the bearingarea 25 of thefront end 24 of the injection device in an exact fit, therear end 4 of thesyringe body 1 comprises the flattenedportion 29 visible inFIGS. 2, 3 and 5. The piston of thesyringe body 1 can be retracted by reversing thedrive wheel 8 against the restoring force of thespring 10. Thesyringe body 1 can then be removed from the casing. - In one embodiment the injection device may be operated as follows: the flexible force transferring means 5 is retracted by reversing the
drive wheel 8, clockwise inFIG. 1 . At the same time, the piston (not shown) can also be moved to its rear end position near therear end 4 of thesyringe body 1. Once the front half-casing 24 has been removed, thesyringe body 1 can be replaced with a new syringe body. The flexible force transferring means 5 is then moved back to abut the piston or is connected to it. The piston is then sufficiently advanced, for example to prime the syringe body. In the rear end position which the piston then reaches, the blockingprojection 15 engages with the outertoothed area 27 of thedrive wheel 8 and locks against its angular adjustment. In this position, the front end of theoperating button 13 protrudes out of the lower half-casing 21. - Pushing the
operating button 13 into the casing releases the blockingprojection 15 from the outertoothed area 27, such that there is a controlled release of the restoring force by the locking means. Lastly, the engagement between the blockingprojection 15 and the outertoothed area 27 is completely or substantially completely released. Due to the restoring force of thespring 10, thedrive wheel 8 then turns, anti-clockwise inFIG. 1 , and thereby slaves the flexible force transferring means 5 connected to thedrive wheel 8 in theregion 7. The front end of the flexible and incompressible force transferring means 5, guided in theguide 20, is thus axially advanced in thesyringe body 1 and thereby slaves the piston stopper, such that liquid is delivered from theinjection needle 3. - As long as the
operating button 13 is sufficiently pushed down, in order to release thedrive wheel 8, the piston is advanced into thesyringe body 1 due to the restoring force, and liquid is expelled. While thedrive wheel 8 rotates, clearly audible clicks can be generated for the user, for example because the teeth in the outertoothed area 27, or dosing protrusions attached at regular angular intervals to the facing sides or lateral areas of thedrive wheel 8, abut an obstacle and thereby emit the click. In principle, the blockingprojection 15 shown in the figures is also suitable as an obstacle, providing the distance between the blockingprojection 15 and the teeth of the outertoothed area 27 is sufficiently small in the releasing position of the rockinglever 14 that on the one hand the blockingprojection 15 and the outertoothed area 27 abut, but on the other this does not prevent thedrive wheel 8 from turning further. - The restoring force of the
spring 10 serving as the restoring means can be adjusted to the flow resistance of the liquid as it is delivered from thesyringe body 1, such that there remains enough time for the user to count out the clicks and so work out the dosage of liquid actually delivered. - The user then lets go of the
operating button 13 again. Due to the restoring force of theleaf spring 18 serving as the second restoring means, and/or a spring (not shown) which pushes theoperating button 13 back out of the casing, the rockinglever 14 is reset into the locking position. Because the steep flanks of the serrated-toothed outertoothed area 27 each lie on the side of the tooth flanks of the outertoothed area 27 lying in the restoring direction, the correspondingly formed blockingprojection 15 is automatically returned to the locking position as soon as a front end of the blockingprojection 15 comes to abut one of the tooth flanks of the outertoothed area 27. The expulsion of liquid is thus automatically terminated when the user lets go of theoperating button 13. - In principle, however, it can also be provided that the restoring force of the
leaf spring 18 and/or the spring (not shown) which pushes theoperating button 13 back out of the casing are too small to move the blockingprojection 15 back into engagement with thetoothed area 27, when thedrive wheel 8 is turning. In such an embodiment, the entire dosage of liquid still available in thesyringe body 1 would then be completely administered. - To even more simply dose the amount of liquid actually delivered using the injection device in accordance with the invention, the locking means is configured, in another embodiment shown in
FIGS. 5 and 6 , such that the piston can only be moved a fraction of the maximum piston stroke pre-set by the front and rear end positions of the piston in thesyringe body 1. In principle, identical reference numerals inFIGS. 5 and 6 indicate identical components and functional groups, such that a description of them is omitted below for reasons of clarity. -
FIGS. 5 and 6 show a second embodiment of the injection device in accordance with the invention from above, with the upper half-casing removed, in a perspective top view and a schematic top view. In accordance with the second embodiment, the rockinglever 14 as a whole is formed substantially L-shaped. The upper limb of the rockinglever 14 is jointed via a joint 17 coupled to theoperating button 13. The lower limb of the rockinglever 14 comprises two blockingprojections rotational point 16 of the rockinglever 14, which are each formed to correspond to the teeth of the outertoothed area 27 of thedrive wheel 8, but which, as can be seen inFIG. 6 , are offset with respect to each other by half a tooth of the outertoothed area 27. Thus, if one of the blockingprojections toothed area 27, then the other of the blockingprojections toothed area 27. - In the resting position of the
operating button 13, shown inFIGS. 5 and 6 , thefirst blocking projection 30 engages with the outertoothed area 27 and locks against angular adjustment of thedrive wheel 8. If theoperating button 13 is then pushed down into the casing, the rockinglever 14 is pivoted about therotational point 16 such that thefirst blocking projection 30 is released from its engagement with the outertoothed area 27 and thesecond blocking projection 31 is moved to the middle of the opposite tooth flank of the outertoothed area 27. Lastly, thesecond blocking projection 31 comes to abut the opposite tooth flank. If theoperating button 13 is pushed further down, thesecond blocking projection 31 slides off, ultimately completely, on the opposite tooth flank and engages, ultimately completely, with the outertoothed area 27. In this position, thefirst blocking projection 30 is preferably completely out of engagement with the outertoothed area 27 and thedrive wheel 8 has turned further by half a tooth flank, anti-clockwise inFIG. 6 . This rotational movement of thedrive wheel 8 is assisted by the restoring force, acting in the same direction, of thespiral spring 10 serving as the restoring means (seeFIGS. 3, 4 ). - The user then lets go of the
operating button 13 again. Due to the restoring force of theleaf spring 18, serving as the second restoring means and abutting the rockinglever 14 in the region of thefirst blocking projection 30, and of a spring (not shown) which pushes theoperating button 13 back out of the casing of the injection device, thesecond blocking projection 31 is gradually released from its engagement with the outertoothed area 27 and thefirst blocking projection 30 is moved back into engagement with the outertoothed area 27. Here, too, thefirst blocking projection 30 slides off, ultimately completely, on the tooth flank opposite it until thefirst blocking projection 30 engages, ultimately completely, with the outertoothed area 27 and locks against further angular adjustment of thedrive wheel 8. - In accordance with the second embodiment, when the
operating button 13 is operated once, thedrive wheel 8 is turned further by exactly one tooth flank of the outertoothed area 27. This corresponds to a minimum amount of liquid which can be dosed by the injection device. Operating theoperating button 13 is easily tangible. The user can thus easily set the dosage of liquid actually delivered by simply counting the number of times, however often, theoperating button 13 is operated. When rotating thedrive wheel 8, clicks can again be generated, as described above, such that the user can also select or calculate the dosage of liquid by sound. - In the above embodiments, the flexible force transferring means 5 is preferably a cylindrical coil spring made of round wires having a constant diameter. The cylindrical cross-section of coil springs enables them to be guided easily, for example using the
stays 20 shown in the figures, which project substantially perpendicularly from the lower or upper half-casing, or using comparable guiding means. In addition, metallic coil springs slide on the guiding stays described above, preferably formed from plastic, with comparatively little resistance. - In principle, however, the flexible force transferring means can also be made from plastic, for example in the form of an articulated plastic band such as is disclosed in WO 98/01173, the content of which is expressly incorporated herein by way of reference.
- In the above embodiments, the
drive wheel 8 can also be latched in ways other than using the outertoothed area 27 and the blockingprojection 15 which cooperates with it. Suitable teeth, texture or latching protrusions can, for example, be provided on an upper side of thedrive wheel 8 or on a disc or the like coupled to a drive axle of thedrive wheel 8, in order to cooperate with latching protrusions or the like of a locking means. Suitable measures will become clear to the person skilled in the art when studying this application. - While it has been described above that the
operating button 13 is operated by hand by the user, a release mechanism operated using motors or electromagnetically can of course also be provided to trigger delivery of the liquid. - A preferred application of the injection device in accordance with the invention is the injection of insulin into subcutaneous fatty tissue, for treating diabetes. The invention is not, however, restricted to this application.
- In the foregoing description, embodiments of the present invention, including preferred embodiments, have been presented for the purpose of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise form or steps disclosed. Obvious modifications or variations are possible in light of the above teachings. The embodiments were chosen and described to provide the best illustration of the principles of the invention and its practical application, and to enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth they are fairly, legally, and equitably entitled.
Claims (7)
1. A device for the controlled delivery of an injectable liquid from a liquid container sealed at a rear end by a piston which can be moved axially in the container to deliver the liquid from the container, the device comprising:
a flexible force transferor axially deviated behind the container away from a generally central longitudinal axis of the container;
a drive mechanism coupled to said transferor to axially move the piston for delivering the liquid;
a restorer applying a restoring force to said drive mechanism and resetting said drive mechanism for delivering liquid from the container, wherein the restorer permanently applies said restoring force to the drive mechanism to reset the drive mechanism from a starting position in which the piston is situated substantially at one end of the liquid container to an end position in which the piston is situated substantially at the other end of the liquid container; and
a lock enabling a controlled movement of the piston by a fraction of a maximum piston stroke pre-set by the starting and end positions of the piston in the liquid container.
2. The device as set forth in claim 1 , wherein the lock comprises a lever which comprises blocking projections on mutually opposite sides of a rotational point of said lever.
3. The device as set forth in claim 1 , wherein the lock comprises a lever which comprises blocking projections on mutually opposite sides of a rotational point of said lever, and wherein the drive mechanism comprises a drive wheel, said blocking projections cooperating with the drive wheel.
4. The device as set forth in claim 3 , wherein the drive wheel carries teeth, the blocking projections offset with respect to each other by a half a tooth of said teeth.
5. The device of claim 3 , wherein the drive wheel moves incrementally when the lock releases the drive wheel.
6. The device as set forth in claim 1 , wherein the flexible force transferor comprises a cylindrical coil spring coupled to a lateral facing area associated with the drive mechanism.
7. A device for the controlled delivery of an injectable liquid from a liquid container sealed at a rear end by a piston which can be moved axially in the container to deliver the liquid from the container, the device comprising:
a coil spring axially deviated behind the container away from a generally central longitudinal axis of the container;
a drive mechanism coupled to said coil spring to axially move the piston for delivering the liquid;
a spiral spring applying a restoring force to said drive mechanism and resetting said drive mechanism for delivering liquid from the container, wherein the spiral spring permanently applies said restoring force to the drive mechanism to reset the drive mechanism from a starting position in which the piston is situated substantially at one end of the liquid container to an end position in which the piston is situated substantially at the other end of the liquid container; and
a lock enabling a controlled movement of the piston by a fraction of a maximum piston stroke pre-set by the starting and end positions of the piston in the liquid container.
Priority Applications (1)
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US11/550,176 US20070065319A1 (en) | 2002-08-30 | 2006-10-17 | Device for Controlled Delivery of an Injectable Liquid |
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DE10240166A DE10240166A1 (en) | 2002-08-30 | 2002-08-30 | Injection syringe for dispensing insulin to treat diabetes has piston operated by flexible belt which is moved by manually-operated wheel with teeth which cooperate with catches set to give predetermined dose |
US10/650,521 US7125395B2 (en) | 2002-08-30 | 2003-08-28 | Device for controlled delivery of an injectable liquid |
US11/550,176 US20070065319A1 (en) | 2002-08-30 | 2006-10-17 | Device for Controlled Delivery of an Injectable Liquid |
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Also Published As
Publication number | Publication date |
---|---|
DE10240166A1 (en) | 2004-03-18 |
US7125395B2 (en) | 2006-10-24 |
US20040054326A1 (en) | 2004-03-18 |
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Legal Events
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Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |