Auto-injector and cassette system with indexing ring in the cassette

Abstract

The present invention relates to a system comprising a cassette and an automatic injector for the delivery of a medicament.The cassette for containing the medicament comprises an index ring.

Description

[Technical Field]

[0001] The present invention relates to a system comprising a cassette and an automatic injector (autoinjector) for the delivery of a drug, the cassette for containing the drug comprising an index ring. [Background technology]

[0002] Auto-injectors for delivering medication to patients come in many varieties depending on the type of medication being delivered to the patient. When an auto-injector is a reusable injection device component into which a disposable cassette is inserted, there are several key requirements that must be met for each of the two components. Auto-injectors must ensure that all operating components within the auto-injector remain fully functional to extend the auto-injector's lifespan. While mechanical stability is required for the cassette, it is often desirable to minimize the use of materials in the disposable cassette to keep manufacturing costs and environmental impact low.

[0003] WO 2021 / 069106 A1 discloses an example of a system including a reusable auto-injector and a disposable cassette, where the disposable cassette is free of major electronic components and spring systems. The auto-injector includes several injection device pins that move into the cassette after assembly of the two parts, thereby releasing a skin sensor and initiating a drug delivery sequence. To release the skin sensor, a flexible arm on the skin sensor deflects as the injection device pins move into the cassette.

[0004] U.S. Patent Application Publication No. 2011 / 202011 discloses an auto-injector having separable front and rear assemblies. The rear assembly includes a drive assembly that is triggered or unlatched by rearward movement of an actuation sleeve extending from the front assembly. A locking dial is provided that locks the actuation sleeve against rearward movement until the dial is moved to an unlocked position.

[0005] EP 2626095 discloses a medication delivery device comprising a housing including a proximal portion rotatably coupled to a distal portion, a drive mechanism disposed with the housing and adapted to apply a force to a plunger to dispense a medication, and a reset mechanism disposed within the housing, wherein when the proximal portion is rotated from a first angular position to a second angular position relative to the distal portion, the reset mechanism is actuated to reset the drive mechanism.

[0006] U.S. Patent Application Publication No. 2021 / 023307 discloses an apparatus including a motor and a hollow drive shaft, the motor configured to rotate the hollow drive shaft.

[0007] U.S. Patent Application Publication No. 2020 / 078529 discloses a medication delivery device configured to provide a variety of different single doses of a medication. The medication delivery device includes a body and a syringe disposed within the body, the syringe containing a medication. The medication delivery device further includes a delivery member shield unit slidably disposed within the body and a removable cap releasably coupled to the delivery member shield unit.

[0008] U.S. Patent Application Publication No. 2016 / 144129 discloses an automatic injector including a case adapted to hold a medication container having a needle, a needle shroud telescopically coupled to the case and movable between a first extended position relative to the case in which the needle is enclosed therein and a retracted position relative to the case in which the needle is exposed, and a plunger rotatably and slidably disposed within the case.

[0009] U.S. Patent Application Publication No. 2017 / 224921 discloses a drug cartridge holding unit that holds a drug cartridge and is attached to a drug injection device body for mounting the drug cartridge to the drug injection device. The drug cartridge holding unit includes an outer cap having a distal end opening and a rear end opening, and a cartridge cover that is disposed inside the outer cap and is held in a state that allows it to slide back and forth relative to the outer cap.

[0010] WO 2021 / 071917 discloses a cassette for a drug delivery device, the cassette for the drug delivery device including a sleeve, a syringe having a barrel disposed within the sleeve, and a plunger stopper slidably disposed within the barrel. The cassette further includes a spacer configured to be coupled to the sleeve. The cassette, together with the drug delivery device, can form part of a device for injecting a therapeutic product. Summary of the Invention

[0011] Throughout this description, all references to a proximal direction or proximal face refer to a portion, surface, etc. oriented toward the site of the injection device. Thus, proximal end means the end of a portion facing the injection site. Proximal movement means movement along / parallel to the longitudinal axis, in a direction toward the injection site.

[0012] The distal end is the opposite end compared to the proximal end. Thus, all references to a distal direction or distal face refer to a portion, surface, etc. oriented in a direction away from the direction of the injection device, i.e., toward the user. Thus, a distal movement is a movement in the opposite direction of a proximal movement. A proximal face is a surface facing in a proximal direction, and a distal face is a surface facing in a distal direction.

[0013] Both proximal and distal surfaces may be found at the distal end, the proximal end, or somewhere in between, as this term refers only to the direction in which the surface is oriented and not to the location of the surface on an individual part.

[0014] Disclosed herein in a first aspect is a cassette for use in an automatic injector for administering a medicament, the cassette extending longitudinally from a proximal end to a distal end, the cassette comprising: a syringe holder for receiving a syringe containing the medicament; a skin sensor longitudinally movable relative to the syringe holder between a plurality of longitudinal positions, the plurality of longitudinal positions including at least a proximal longitudinal position and a distal longitudinal position; and an indexing ring rotatable relative to the skin sensor between a plurality of rotational positions, the plurality of rotational positions including at least a first rotational position in which the skin sensor is prevented from moving distally and a second rotational position in which the skin sensor is movable between the distal longitudinal position and the proximal longitudinal position, the rotational position of the indexing ring being configured to be controlled by one or more release members within the automatic injector when the cassette is secured within the automatic injector.

[0015] The cassette according to the first aspect further provides a cassette with improved stability compared to the cassette disclosed in WO 2021 / 069106 A1 by replacing the fragile flexible arm on the skin sensor with a mechanically stable index ring. The index ring further allows for improved control of the position to which the skin sensor can be moved, since multiple rotational positions of the index ring can be coupled to multiple longitudinal positions to which the skin sensor can be moved. Improved control of the longitudinal position of the skin sensor is further obtained. This provides better safety for the user after inserting a syringe with a needle into the cassette, since the user can be protected from contact with the needle, which may be covered by the skin sensor.

[0016] Additionally, its manufacture is easier and improved compared to previously known auto-injectors.

[0017] Furthermore, the cassette according to the first aspect allows for more reliable and tamper-evident detection, as the cassette will be rejected by the auto-injector if the locking ring is not in the correct position. Instead of relying on a plastic spring, the cassette according to the first aspect provides perfect guidance of the movement of the device.

[0018] In a second aspect, an automatic injector for administering a medication is disclosed herein. The automatic injector is adapted to receive a cassette including: a syringe holder for receiving a syringe containing the medication; a skin sensor longitudinally movable relative to the syringe holder between two or more longitudinal positions including at least a longitudinal distal position (LD) and a longitudinal proximal position (LP); and an index ring rotatable relative to the skin sensor between two or more rotational positions including a first rotational position (R1) and a second rotational position (R2) where the skin sensor is movable between the distal position and the proximal position.

[0019] The auto-injector extends from a proximal end to a distal end along a longitudinal axis, and the cassette is removably received within the auto-injector along the longitudinal axis.

[0020] The automatic injector comprises an injection device housing and a plurality of internal injection device components positioned within the injection device housing, the internal injection device components including at least a plunger rod configured to move proximally for delivery of a medicament, a drive module adapted to move the plunger rod proximally, and one or more release members releasably connected to the plunger rod via a clutch configured to rotate the indexing ring between two or more rotational positions when the one or more release members move proximally and contact the indexing ring. a first clutch position in which the plunger rod and the one or more release members are longitudinally coupled for proximal movement together; a second clutch position in which the plunger rod is longitudinally decoupled from the one or more release members and allows the plunger rod to move longitudinally while the one or more release members are longitudinally stationary.

[0021] The autoinjector according to the second aspect provides an autoinjector with improved stability compared to the autoinjector disclosed in WO 2021 / 069106 A1 by replacing the fragile pin with a more mechanically stable release member. The clutch-based control of the movement of the plunger rod and release member into the cassette allows for a reduction in material for the release member, since the release member does not need to fully follow the plunger rod into the cassette during medication delivery. This provides more space for other components within the device. Alternatively, the device can be made more compact. The cassette does not need to have a compartment / space for the pin extending along its entire length, thereby providing a smaller, thinner cassette, thereby reducing material costs for the cassette. Manufacturability of components and avoidance of overly constrained end positions are also achieved by the autoinjector according to the second aspect. Furthermore, the amount of friction is reduced when power is required for injection, resulting in less power and force loss due to friction. Longitudinal decoupling of the one or more release members from the plunger rod need not be directly coupled to rotational movement of the indexing ring. Thus, rotational movement of the indexing ring to the second rotational position (R2) may occur before the one or more release members are released from the plunger rod. Thus, the one or more release members may continue longitudinal movement with the plunger rod a short distance before being decoupled from the plunger rod.

[0022] In a third aspect, a cassette for use in an automatic injector for administering a medication is disclosed herein, the cassette extending longitudinally from a proximal end to a distal end. The cassette includes: a syringe holder for receiving a syringe containing the medication; a skin sensor including a cap retaining means at a proximal end of the skin sensor; a cassette housing including a cap retaining portion at the proximal end of the cassette housing; and a removable cassette cap including one or more locking cap portions extending distally from the proximal end of the cassette cap. Prior to use, a cassette cap locking protrusion on each of the one or more locking cap portions is secured within the cassette housing. The skin sensor is longitudinally movable relative to the syringe holder between at least an initial locking position LP1 and an intermediate position LP2 proximal to the initial locking position LP1. Upon proximal movement of the skin sensor from the initial locking position LP1 to the intermediate position LP2, the distal locking end moves outward from the cassette housing.

[0023] In a fourth aspect, the present disclosure provides a cassette for use in an automatic injector for administering a medication, the cassette extending longitudinally from a proximal end to a distal end. The cassette includes: a syringe holder for receiving a syringe containing the medication; a skin sensor including a cap retaining means at a proximal end of the skin sensor; an indexing ring; a cassette housing including a cap retaining portion at a proximal end of the cassette housing; and a removable cassette cap including one or more locking cap portions extending distally from the proximal end of the cassette cap, wherein, prior to use, a cassette cap locking protrusion on each of the one or more locking cap portions is secured within the cassette housing. The skin sensor is longitudinally movable relative to the syringe holder between at least an initial locking position LP1 and an intermediate position LP2 proximal to the initial locking position LP1, and the indexing ring is rotatable relative to the skin sensor between at least a first rotational position R1 and a cap-release rotational position Rcr. When the index ring is in the cap-release rotation position Rcr, the skin sensor is movable to the intermediate position LP2. Rotational movement of the index ring from the first rotation position R1 to the cap-release rotation position Rcr allows the skin sensor to move proximally from the initial lock position LP1 to the intermediate position LP2, and the removable cassette cap moves proximally with the skin sensor, thereby moving the distal lock end outside the cassette housing.

[0024] Therefore, upon proximal movement of the skin sensor from the initial lock position LP1 to the intermediate position LP2 caused by rotational movement of the index ring from the first rotation position R1 to the cap release rotation position Rcr, the removable cassette cap moves proximally along with the skin sensor, thereby causing the distal lock end to move outside the cassette housing.

[0025] The intermediate position LP2 according to the third and fourth aspects may also be referred to as a ready-to-remove-cap position. The cassettes according to the third and fourth aspects provide improved control over cassette cap removal compared to the cassette disclosed in WO 2021 / 069106 A1. The cassette cap of the cassette in WO 2021 / 069106 A1 can be removed from the cassette before locking the cassette to the auto-injector. The cassettes according to the third and fourth aspects may be constructed to prevent the cassette cap from being removed from the cassette until the cassette is securely secured within the auto-injector and interaction with the auto-injector results in the release of the skin sensor, allowing the skin sensor to move to the intermediate position LP2 and the cassette cap to be removed from the cassette. This improves user safety. Drug safety is also improved because contact with the syringe in the cassette is only available when intended, i.e., when correctly inserted into the auto-injector. If the cassette is misused, this can be detected and the user will be unable to use the cassette, thereby reducing the risk of the user being injured by the needle in the syringe or the risk of the needle in the syringe being damaged by the user, and the drug barrier at the end of the needle is not compromised prior to use.

[0026] Disclosed herein in a fifth aspect is a system for administering a medication, the system comprising a reusable auto-injector according to the second aspect and a disposable cassette according to the first, third or fourth aspect.

[0027] Disclosed herein in a sixth aspect is a system for administering a medication, the system comprising: a cassette; and an automatic injector adapted to receive the cassette. The cassette comprises a syringe including a syringe medication compartment, an outlet at a proximal end of the syringe medication compartment, and a stopper positioned within the syringe compartment, the stopper being movable from a distal end of the syringe compartment toward a proximal end of the syringe compartment to empty the medication within the syringe compartment through the outlet.

[0028] The cassette includes a syringe holder for receiving a syringe; ○ Distal position LD, ○ Final lock position LP3, an initial locking position LP1 between the final locking position LP3 and the distal position LD, and an intermediate position LP2 between the initial locking position LP1 and the final locking position LP3; and a skin sensor that is movable in the longitudinal direction relative to the syringe holder between two or more longitudinal positions selected from the initial locking position LP1 and the final locking position LP3.

[0029] The cassette may additionally include: ○ first rotational position R1, a delivery rotation position Rd in which the skin sensor is movable between a distal position LD and a final locking position LP3; An index ring is provided that is rotatable relative to the skin sensor between two or more rotational positions selected from the first rotational position R1 and a cap release rotational position Rcr that is located between the first rotational position R1 and the delivery rotational position Rd.

[0030] The auto-injector extends from a proximal end to a distal end along a longitudinal axis, and the cassette is removably received within the auto-injector along the longitudinal axis.

[0031] The automatic injector comprises an injection device housing and a plurality of internal injection device components positioned within the injection device housing, the internal injection device components including at least a plunger rod configured to move a stopper proximally within a cassette, a drive module adapted to move the plunger rod proximally, and one or more release members configured to rotate an index ring between two or more rotational positions when the one or more release members move proximally.

[0032] The system according to the sixth aspect provides a system that allows for improved control of cassette cap removal compared to the cassette disclosed in WO 2021 / 069106 A1, where the cassette cap can be removed from the cassette before locking the cassette into the auto-injector. This removal is not possible in the system according to the sixth aspect, where the cassette cap is locked into the cassette housing until released by the auto-injector. This increases the stability of the cassette and improves user safety. Furthermore, the system according to the sixth aspect provides a system with improved stability compared to the system disclosed in WO 2021 / 069106 A1 by replacing the fragile flexible arms on the skin sensor in the cassette with a mechanically stable indexing ring. The indexing ring further allows for improved control of the positions to which the skin sensor can be moved, as multiple rotational positions of the indexing ring can be coupled to multiple longitudinal positions to which the skin sensor can be moved. The system according to the sixth aspect further provides control over the sequence of steps taken by the user when using the system, which increases the safety of patients using the system. Thus, the system control logic contained in the reusable device ensures injection under improved safety conditions.

[0033] In a seventh aspect, the present specification discloses a cassette for use in an automatic injector for administering a medication. The cassette includes a syringe holder extending longitudinally from a proximal end to a distal end. The syringe holder includes a syringe holder tubular portion for receiving a syringe containing the medication, and a syringe holder cap.

[0034] The syringe holder tubular portion includes a plurality of syringe holder lid locking openings at a distal end of the syringe holder tubular portion, the holder lid including a substantially C-shaped lid portion including an inner surface, the substantially C-shaped lid portion hingedly connected to the distal end of the syringe holder tubular portion, the substantially C-shaped lid portion an open position that allows for positioning of a syringe within the syringe holder through an opening in the distal end of the syringe holder tubular portion; a closed position that prevents the syringe from exiting the syringe holder through the opening at the distal end of the syringe holder tubular portion, and in which the inner surface of the substantially C-shaped lid portion is oriented towards the syringe when the syringe is positioned within the syringe holder.

[0035] The syringe holder lid further includes a plurality of support lid portions extending from an inner surface of the substantially C-shaped lid portion and a plurality of lid locking tabs positioned within a plurality of syringe holder lid locking openings in the syringe holder tubular portion when the substantially C-shaped lid portion is in the closed position.

[0036] The syringe holder cassette according to the seventh aspect provides a syringe holder with a more flexible lid. If a user presses the syringe asymmetrically, the syringe holder lid may be affected only in some areas, rather than across the entire lid surface. Splitting the ring-shaped lid ensures that the force is not transmitted around the entire ring. This allows the lid to remain locked inside the cylinder opening in more locations, even if the lid is pressed out of position in one location. Furthermore, only the support lid portion protruding from the inner surface is allowed to contact the syringe flange, again ensuring that the force is not transmitted to the entire syringe holder lid.

[0037] The syringe typically contacts the syringe holder lid only when pushed distally during use. Thus, there is typically an open space between the proximal face of the syringe holder lid and the distal end of the syringe. Thus, the syringe holder lid has a safety feature and does not have a syringe securing or retention feature. Instead, the syringe is typically secured by other means inside the syringe holder near the needle end or along the tubular portion of the syringe holder.

[0038] Typically, an auto-injector according to any of the above aspects is a reusable injection device, and a cassette according to any of the above aspects is a disposable cassette that is discarded after drug delivery. The cassette may be compatible with a range of standard pre-filled syringes and may therefore be used to deliver a wide range of drug products with widely different injection volumes and viscosities.

[0039] Typically, the cassette is made solely of plastic and therefore lacks a metal spring. This reduces the size and weight of the cassette compared to known disposable infusion devices that also include infusion device components for controlled transfer of the medication out of the syringe. During transport and storage, the cassette is free of any filler, allowing for a minimalist approach to packaging and reduced requirements for this. Therefore, ensuring the absence of springs in the cassette ensures improved mechanical stability during transport.

[0040] The syringe may be mounted within the cassette by axially inserting the syringe at the distal end of the cassette. A syringe suitable for insertion into the cassette may include a syringe compartment containing a medication, an outlet at a proximal end of the syringe compartment, and a stopper positioned within the syringe compartment. The stopper is typically movable from the distal end of the syringe compartment toward the proximal end of the syringe compartment to empty the medication within the syringe compartment through the outlet. When the syringe is positioned within the syringe holder, the skin sensor may cover the syringe outlet when the skin sensor is in a proximal longitudinal position, while the syringe outlet is exposed when the skin sensor is in a distal longitudinal position.

[0041] Typically, the syringe is a 1.0 mL or 2.25 mL syringe. The syringe typically has a shoulder at the proximal end of the syringe compartment that tapers toward the syringe outlet. A flange is typically found at the distal end of the syringe compartment.

[0042] When referring to a "longitudinal proximal position" in relation to a skin sensor in a cassette according to any of the above embodiments, it may refer to multiple proximal positions. Each of these positions may generally represent a position where the skin sensor covers the outlet. The proximal positions may include an initial position LP1, an intermediate position LP2, and a final position LP3. The initial position LP1 is a position distal to the final position LP3 and proximal to the distal position LD, and is therefore located between both positions. The intermediate position LP2 is a position between the initial position LP1 and the final position LP3.

[0043] The proximal position may be a locked position in which proximal and / or distal movement of the skin sensor is prevented. Therefore, the longitudinal position may also be referred to as a locked position. Whether the longitudinal position is locked or not is determined by the position of the index ring. When the index ring is in the first rotational position, the skin sensor is typically in the locked proximal longitudinal position, regardless of which of the proximal longitudinal positions the skin sensor is in.

[0044] When referring to an indexing ring in a cassette according to any of the above embodiments, a "first rotational position" typically refers to a position where rotation is possible in only one direction. However, the second rotational position need not be a position where the indexing ring cannot be rotated further away from the first rotational position. The second rotational position may also be an intermediate position where the skin sensor is unlocked but still prevented from moving to the most proximal and / or most distal possible positions. The second rotational position may be, for example, a cap-release rotational position or a delivery rotational position.

[0045] When the index ring is rotated from the second rotational position to the first rotational position, the skin sensor can be locked longitudinally by interaction with the index ring. The skin sensor can be locked in the longitudinal position where it is located when the index ring is rotated from the second rotational position to the first rotational position. The longitudinal position of the skin sensor can be determined by user interaction with the cassette, for example, by pushing the skin sensor distally longitudinally. Thus, the locked position can be an initial locked position, a final locked position after drug injection, or an intermediate locked position where the skin sensor can be locked if the drug delivery procedure is abandoned before the drug is fully injected.

[0046] Thus, in one or more examples, when the skin sensor is in a longitudinal proximal position and the index ring is in a first rotational position, the skin sensor is prevented from moving distally from the longitudinal proximal position by the index ring.

[0047] Prior to use, the index ring may be in a first rotational position, and the skin sensor may be locked relative to the syringe holder in an initial, locked position. As noted above, the initial, locked position is an example of a proximal position. "Pre-use" refers to the initial delivery configuration the cassette has before it is assembled into the auto-injector. Locking the skin sensor and index ring ensures that the skin sensor is locked in place longitudinally and the index ring is locked in place rotationally.

[0048] In one or more examples, when the index ring is in the second rotational position, the skin sensor is unlocked and movable proximally and / or distally relative to the syringe holder. Thus, during rotation of the index ring from the first position to the second position, the skin sensor is unlocked from the initial locked position, allowing the skin sensor to move longitudinally in the distal and / or proximal directions. Thus, when the index ring is in the second rotational position, the skin sensor may be movable longitudinally relative to the index ring. Release may occur at any time during the rotation of the index ring. Typically, the index ring is rotated a certain amount before release occurs to ensure that the release cannot occur due to, for example, violent vibration of the cassette. The longitudinal distance that the skin sensor is permitted to move when released may vary depending on how much the index ring is rotated compared to the initial, first rotational position. Typically, when the skin sensor is unlocked from the initial locked position, the skin sensor can be moved longitudinally in both the distal and proximal directions.

[0049] In one or more examples, the indexing ring is symmetrical about its longitudinal axis so that a 180 degree rotation of the indexing ring provides the same design. This gives the user the option of inserting the cassette into the auto-injector in two different ways, which also allows for greater flexibility in inserting the cassette's internal components, and further helps ensure that external forces do not displace the operating state of the indexing ring.

[0050] In one or more examples, before use, the skin sensor is locked in an initial locking position, and after use, the skin sensor is in a final locking position, the initial locking position being positioned between the final locking position and the longitudinally distal position.

[0051] Both the initial and final locked positions are examples of proximal positions. "Before use" refers to the initial delivery configuration the cassette has before it is assembled into the auto-injector. "After use" refers to the configuration the cassette is in after complete delivery of the medication. In the "after use" configuration, the needle, which was inserted into the user during medication delivery, has been removed from the injection site.

[0052] In one or more examples, the cassette further comprises a cassette housing and a removable cassette cap positioned at a proximal end of the cassette housing. Typically, the cassette housing at least partially encloses the syringe holder, the syringe when positioned in the syringe holder, the skin sensor, and at least the index ring prior to use. In many cases, the cassette housing will enclose at least 90% of the syringe holder, skin sensor, and index ring, if not completely.

[0053] In one or more embodiments, the cassette cap includes one or more cap locks extending distally from a proximal end of the cassette cap, and prior to use, a cassette cap lock protrusion on each of the one or more cap locks is secured to the inside of the cassette housing. The skin sensor may also include a cap retaining means, the cap retaining means including a recess and a lamp at the proximal end of the skin sensor, the recess being positioned distal to the lamp. The cassette housing may include a cap retaining portion extending radially inward at the proximal end of the cassette housing. Prior to removal of the cassette cap, an inwardly extending portion of the cassette cap lock protrusion on each of the one or more cap locks may be secured between the recess and the cap retaining portion of the skin sensor and may further abut against a proximal protrusion that prevents proximal movement of the cassette cap. This securely secures the cassette cap between the skin sensor and the cassette housing within the cassette.

[0054] In one or more examples, upon proximal movement of the skin sensor from the initial locked position to the intermediate position, the distal locking end is moved to a position outside the cassette housing, allowing removal of the cassette cap when the skin sensor is in the intermediate position. Removal of the skin sensor can be performed at this point without applying significant force, instead simply by pulling the cassette cap proximally. If a syringe with a needle shield, e.g., a rigid needle shield (RNS), is included in the cassette, removal of the cassette cap typically also results in removal of the needle shield, as the cassette cap typically fits around the needle shield so that the two parts move together. The cassette cap can include several subparts depending on and adapted to the type of needle shield being removed.

[0055] In one or more examples, the one or more cap lock portions and / or the cassette cap lock protrusions on each of the one or more cap lock portions are flexible, and upon proximal movement of the skin sensor from the initial lock position LP1 to the intermediate position LP2, the one or more cap lock portions and / or the cassette cap lock protrusions on the lock portions are configured to bend radially inward within the recess of the skin sensor, thereby allowing the cassette cap lock protrusions to pass proximally through the cap holder, and when the skin sensor is in the intermediate position LP2, the one or more lock portions and / or the cassette cap lock protrusions on the lock portions are configured to bend radially outward and slide up the ramp when the cassette cap is removed from the cassette.

[0056] After drug delivery is complete, the cassette cap can be reattached to the cassette. The cassette cap will not typically be locked between the cassette housing and the skin sensor as in the initial delivery position, but may be positioned within the recess of the skin sensor.

[0057] In one or more embodiments, the cassette housing at least partially surrounds the syringe holder and skin sensor, and in many cases, the cassette housing will surround at least 90% of the syringe holder and skin sensor, if not completely.

[0058] In one or more examples, the cassette further comprises an index ring rotatable relative to the skin sensor between at least a first rotational position R1 and a cap-release rotational position Rcr, wherein prior to use, the index ring is in the first rotational position R1 and the skin sensor is in an initial locking position LP1, and when the index ring is in the cap-release rotational position Rcr, the skin sensor is movable to an intermediate position LP2, and the rotational position of the index ring is controlled by a locking member within the automatic injector when the cassette is secured within the automatic injector.

[0059] In one or more examples, the index ring is further rotatable to a delivery rotation position Rd, and the cap release rotation position Rcr is located between the first rotation position R1 and the delivery rotation position Rd, and when the index ring is in the delivery rotation position Rd, the skin sensor is movable between a final locking position LP3 and a longitudinal distal position LD, and the initial locking position LP1 and the intermediate position LP2 are located between the final locking position LP3 and the longitudinal distal position LD.

[0060] In one or more examples, the syringe outlet includes a needle covered by a removable needle shield, and the cassette cap includes a second distal extension that extends around and grips the needle shield to remove the needle shield when the cassette cap is removed from the cassette.

[0061] In one or more examples, the cassette further comprises a syringe having a syringe compartment containing a medication, an outlet at a proximal end of the syringe compartment, and a stopper positioned within the syringe compartment, the stopper being movable from a distal end of the syringe compartment toward the proximal end of the syringe compartment to empty the medication within the syringe compartment through the outlet. The syringe outlet can be a hollow needle.

[0062] In one or more examples, the syringe includes a removable needle shield that covers the syringe outlet prior to use, and the cassette cap includes a second distal extension that extends around and grips the needle shield, thereby removing the needle shield when the cassette cap is removed from the cassette housing.

[0063] In one or more examples, the internal injection device component of the automatic injector includes a skin sensor spring system adapted to urge the skin sensor proximally, and when the one or more release members move proximally within the cassette and contact the index ring, the index ring rotates from a first rotational position R1 toward a cap-release rotational position Rcr, thereby causing the skin sensor spring system to urge the skin sensor proximally.

[0064] In one or more examples, when the skin sensor is in the longitudinal distal position LD, the syringe outlet is exposed, and when the skin sensor is in any of the initial locking position LP1, the intermediate position LP2, and the final locking position LP3, the skin sensor covers the syringe outlet, which are all examples of longitudinal proximal positions.

[0065] Thus, in one or more examples, when the skin sensor is in the final locked position and the index ring is in the first rotational position, the skin sensor covers the syringe outlet, and in one or more examples, when the skin sensor is in the longitudinal distal position and the index ring is in the delivery rotational position, the syringe outlet is exposed.

[0066] In one or more examples, when the skin sensor is in the longitudinal distal position LD and the index ring is in the delivery rotation position Rd, the medication can be delivered by auto-injector-induced proximal movement of the stopper in the syringe compartment.

[0067] The skin sensor may be aligned with the cassette housing at its two proximal ends when the skin sensor is at the longitudinal distal position LD. The longitudinal distal position LD can also be considered a delivery position. Typically, the skin sensor is pressed into the longitudinal distal position LD when a user presses the proximal end of the cassette against the delivery site. Therefore, the skin sensor is not typically locked into the longitudinal distal position LD. Instead, its position is maintained by the user pressing the proximal end of the cassette against the delivery site. If the user removes the cassette from the infusion site before drug delivery is complete, the skin sensor is typically moved proximally from the longitudinal distal position LD by interaction with the auto-injector. This typically results in the skin sensor being moved to a position where the syringe outlet is covered by the skin sensor.

[0068] In one or more examples, the index ring is configured to move from the cap release rotation position Rcr to the delivery rotation position Rd when the skin sensor is in the longitudinal distal position LD to prepare the system for drug delivery.

[0069] In one or more examples, the index ring comprises a tubular index ring portion that extends around the tubular skin sensor portion. Alternatively, or in combination, the index ring may include a tubular index ring portion that extends around the syringe holder.

[0070] In one or more examples, the indexing ring is configured to move between a plurality of rotational positions when the cassette is inserted into the auto-injector and a release member included in the auto-injector moves proximally into the cassette and contacts the indexing ring. The release member may rotate the indexing ring by contacting a flexible member on the indexing ring, which releases the indexing ring and allows it to rotate.

[0071] In one or more examples, the indexing ring includes a track extending in an oblique direction, each of the one or more release members configured to travel inside the track, and the indexing ring is rotated when the release member travels proximally inside the track. Each of the one or more release members may include a track guide protrusion, the track guide protrusion configured to travel inside the track.

[0072] In one or more examples, the indexing ring includes a track extending from a first corner to a second corner, and the indexing ring is configured to rotate from a first rotational position to a second rotational position when the cassette is inserted into the automatic injector and a release member included in the automatic injector moves proximally within the track.

[0073] In one or more examples, the indexing ring includes a first radially extending portion having a first surface area extending between a first proximal face and a first distal face, the first surface area including a track extending from a first corner of the surface area to a second corner of the surface area, and the indexing ring is configured to rotate from a first rotational position to a second rotational position when the cassette is inserted into the automatic injector and a release member included in the automatic injector moves proximally within the track. Thus, the indexing ring may include a first radially extending portion having a first surface area extending between a first proximal face and a first distal face, and the track is located on the surface area.

[0074] The surface area on the radial portion need not cover the entire surface of the radial portion, but may instead be a smaller area defined by two corners between which the track extends.

[0075] The first radially extending portion may be part of a tubular indexing ring portion.

[0076] In one or more examples, the track is positioned on the first longitudinal extension.

[0077] In one or more examples, the indexing ring is configured to rotate to a first rotational position when a release member included in the automatic injector moves distally inside the track. Each of the one or more release members may include a track guide protrusion, the track guide protrusion configured to move inside the track. By retracting the release member / track guide protrusion back into the automatic injector by distal movement of the track guide protrusion, the indexing ring is rotated back to its initial position. Thus, the rotational position of the indexing ring is controlled by movement of the release member.

[0078] In one or more examples, the track extends in an angular direction from the first corner to the second corner, the angular direction being 20 to 70 degrees, for example, 30 to 60 degrees, for example, 35 to 55 degrees, for example, 40 to 50 degrees, for example, approximately 45 degrees, relative to the longitudinal direction of the cassette.

[0079] In one or more examples, the track includes a first track section, a second track section, and a third track section; the first track section extends in a first angular direction from a first corner towards a first intermediate point; the second track section extends in a second angular direction along the length of the cassette from a first midpoint to a second midpoint; the third track section extends in a third angular direction from the second midpoint toward the second corner; the first angular direction and / or the third angular direction is 20 to 70 degrees, for example, 30 to 60 degrees, for example, 35 to 55 degrees, for example, 40 to 50 degrees, for example, approximately 45 degrees, relative to the longitudinal direction of the cassette; The second angular direction is −20 to 20 degrees, for example, −10 to 10 degrees, for example, approximately 0 degrees, relative to the longitudinal direction of the cassette.

[0080] Alternative track tilts may also be envisaged, where the tilt angle varies continuously in any angular direction such that the track section(s) acquire a concave or convex track tilt.

[0081] In one or more examples, the skin sensor includes a protruding tab on an outer surface of the skin sensor, and the index ring includes a first longitudinal extension having a first recess in which the protruding tab is restrained prior to use.

[0082] In one or more examples, the index ring includes a locking tab and the skin sensor includes a first locking recess in which the locking tab is restrained prior to use.

[0083] In one or more examples, the first longitudinally extending portion extends proximally from the first proximal surface on the first radially extending portion.

[0084] In one or more examples, the protruding tab abuts the first proximal surface when the skin sensor is in the longitudinal distal position LD, thereby preventing distal movement of the skin sensor relative to the syringe holder.

[0085] In one or more examples, the skin sensor includes a first distal surface that abuts the first proximal surface when the skin sensor is in the longitudinal distal position LD, thereby preventing distal movement of the skin sensor relative to the syringe holder.

[0086] In one or more examples, the indexing ring further includes a second radial extension having a second proximal surface and a second distal surface.

[0087] In one or more examples, the protruding tab abuts the second proximal surface when the skin sensor is in the final locking position LP3 and the index ring is in the first rotational position R1, thereby preventing distal movement of the skin sensor relative to the syringe holder.

[0088] In one or more examples, the distal surface abuts the second proximal surface when the skin sensor is in the final locking position LP3 and the index ring is in the first rotational position R1, thereby preventing distal movement of the skin sensor relative to the syringe holder.

[0089] In one or more examples, the second radially extending portion is connected to a proximal end of the first longitudinally extending portion.

[0090] In one or more examples, the index ring includes a second longitudinal extension extending from a first proximal face of the first radial extension and connected to the second radial extension at a proximal end of the second longitudinal extension.

[0091] In one or more examples, the index ring is configured to be rotated to a cap-release rotation position Rcr positioned between the first rotation position R1 and the delivery rotation position Rd, and at the cap-release rotation position Rcr, the skin sensor is movable between a longitudinal distal position LD and an intermediate position LP2, the intermediate position LP2 being positioned between the final locking position LP3 and the initial locking position LP1. The intermediate position is an example of a proximal position.

[0092] In one or more examples, when a release member included in the auto-injector is in the second track section, the indexing ring is in the cap-release rotational position Rcr.

[0093] In one or more examples, when the index ring is in the cap-release rotation position Rcr, the skin sensor is prevented from moving from the intermediate position LP2 to the final locked position LP3. Preventing proximal movement from the intermediate position LP2 can be achieved in several ways.

[0094] In one or more examples, when the index ring is in the cap-release rotation position Rcr and the skin sensor is in the intermediate position LP2, the protruding tab abuts against a second distal surface on the index ring, thereby preventing the skin sensor from moving proximally from the intermediate position LP2.

[0095] In one or more examples, when the index ring is in the cap-release rotation position Rcr and the skin sensor is in the intermediate position, the locking tab on the index ring abuts against a second locking tab support surface on the skin sensor, thereby preventing the skin sensor from moving proximally from the intermediate position LP2.

[0096] In one or more examples, the skin sensor is configured to be moved to the longitudinal distal position LD by a user pressing the skin sensor against the injection site when the index ring is in the cap release rotation position Rcr, between the cap release rotation position Rcr and the delivery rotation position Rd, or in the delivery rotation position Rd.

[0097] In one or more examples, the first longitudinal extension includes a second recess in which the protruding tab is restrained when the skin sensor is in the intermediate position LP2 and the index ring is in the first rotational position R1.

[0098] In one or more examples, the protruding tab on the first longitudinal extension is restrained within the second locking recess on the skin sensor when the skin sensor is in the intermediate position LP2 and the index ring is in the first rotational position R1.

[0099] In one or more examples, the index ring is longitudinally locked to the syringe holder. Similarly, the skin sensor and syringe holder are typically rotationally locked.

[0100] The cassette may include a label, such as an RFID tag, that is readable by the auto-injector. The information contained on the RFID tag may relate to the type of medication or the dosage of medication in the cassette. The auto-injector may be configured to read the information on the RFID tag and accordingly control the movement of the plunger rod to push the stopper proximally for medication delivery.

[0101] A syringe holder as described above in the seventh aspect is suitable for use with any of the described examples of cassettes. In one or more examples of the syringe holder, the substantially C-shaped lid includes a through channel in the substantially C-shaped lid that divides the substantially C-shaped lid into two lid sections, including a first lid section and a second lid section. The C-shaped lid can also be referred to as an open circle or a circle with a circumferential cutout opening. Thus, the substantially C-shaped lid can have a circular shape with the opening spanning at least 10%, e.g., at least 20%, e.g., at least 30% of the area of ​​the entire circumference of the circle.

[0102] The two lid sections may be connected by a bridge portion of the substantially C-shaped lid that also forms a hinged connection to the distal end of the syringe holder tubular portion. As an alternative to a C-shaped lid, a two-part lid formed as two semicircles is also contemplated. The two semicircles may be connected by a bridge portion, or alternatively, each separate semicircle may be hingedly connected to the syringe holder tubular portion.

[0103] In one or more examples of the syringe holder, the first and second lid sections are at least partially displaceable relative to one another along the longitudinal axis. By partially displaceable, it is meant that one section may be twisted or pushed distally or proximally without moving the other section to the same extent. The flexibility of the substantially C-shaped lid further ensures that if a user pushes the syringe unevenly from the proximal direction, only a portion of the substantially C-shaped lid is affected, as the force is not easily transferred around the substantially C-shaped lid.

[0104] The C-shape of a substantially C-shaped lid may extend in substantially the same plane. In one or more embodiments, the substantially C-shaped lid extends in a plane substantially perpendicular to the longitudinal direction in the closed position. The substantially C-shaped lid may still be able to twist as described above. Thus, extending in substantially the same plane does not refer to a lid having a middle portion extending in a first plane and two side portions extending from each side of the middle plane in a second plane that is angled 60 to 120 degrees relative to the first plane.

[0105] In one or more examples of the syringe holder, the support lids substantially cover less than 50%, e.g., less than 40%, e.g., less than 30%, e.g., less than 20%, e.g., less than 10% of the inner surface area of ​​the C-shaped lid. Having a fractured surface structure on the surface that the syringe may contact ensures that not all of the support lid will come into contact with the syringe if a user pushes the syringe unevenly from the proximal direction. This ensures that the pressure is not transmitted substantially to the entire C-shaped lid. In the unlikely event that a user successfully pushes the syringe hard enough to push one of the locking tabs out of the syringe holder lid locking opening, the other locking tabs increase in position, thereby increasing the security of preventing the syringe from being pushed out of the distal end of the syringe holder.

[0106] In one or more examples of the syringe holder, the plurality of support lids includes at least four support lids. Each of the plurality of lid locking tabs may fit into a separate one of the syringe holder lid locking openings. A distal surface of the lid locking tab may rest against a proximal inner surface of each of the syringe holder lid locking openings when the syringe holder lid is in the closed position.

[0107] In one or more examples of the syringe holder, when the syringe is correctly positioned inside the syringe holder tubular portion and the cassette is ready for use, the syringe is not in direct contact with the syringe holder lid. The syringe typically only contacts the syringe holder lid when pushed distally during use. Thus, there is typically an open space between the proximal face of the syringe holder lid and the distal end of the syringe. Therefore, the syringe holder lid has a safety function and does not have a syringe securing or retaining function.

[0108] In one or more examples, the syringe is enclosed within a syringe holder, and the syringe is a syringe compartment containing the medication; an outlet at the proximal end of the syringe compartment; a stopper positioned within the syringe compartment, the stopper being movable from a distal end of the syringe compartment towards a proximal end of the syringe compartment to empty the medication within the syringe compartment through the outlet; and a syringe flange at the distal end of the syringe section.

[0109] In one or more examples of a cassette having a syringe holder as described above, the cassette further comprises a skin sensor movable relative to the syringe holder between a plurality of longitudinal positions including at least a proximal longitudinal position and a distal longitudinal position.

[0110] In one or more examples of the cassette with the syringe holder described above, the cassette includes an index ring rotatable relative to the skin sensor between a plurality of rotational positions including at least a first rotational position in which the skin sensor is prevented from moving distally and a second rotational position in which the skin sensor is movable between a longitudinal distal position and a longitudinal proximal position, and the rotational position of the index ring is configured to be controlled by one or more release members within the automatic injector when the cassette is secured within the automatic injector.

[0111] In one or more examples of the cassette with syringe holder described above, the cassette further comprises a cassette housing including a cap retainer at a proximal end of the cassette housing, and a removable cassette cap secured within the cassette housing.

[0112] In one or more examples of the cassette with the syringe holder described above, the cassette housing includes a cap retainer portion at a proximal end of the cassette housing, the removable cassette cap includes one or more locking cap portions extending distally from the proximal end of the cassette cap, prior to use, a cassette cap locking protrusion on each of the one or more locking cap portions is secured within the cassette housing, the skin sensor is longitudinally movable relative to the syringe holder between at least an initial locking position and an intermediate position proximal to the initial locking position, and when the skin sensor moves proximally from the initial locking position to the intermediate position, the distal locking end moves outside the cassette housing.

[0113] In one or more examples of the automatic injector, the injection device housing includes a cassette cover section that extends to cover at least a portion of the cassette when the cassette is received within the injection device, and a distal housing portion that extends to cover internal injection device components within the injection device housing before the cassette is secured within the injection device.

[0114] When the cassette is received within the injection device, the cassette cover section extends to cover 20-90% of the cassette, for example, 30-75% of the cassette, for example, 40-60% of the cassette. The auto-injector includes a cassette abutment surface adapted to abut a distal end of the cassette when the cassette is secured within the auto-injector.

[0115] In one or more examples, the automatic injector includes one or more cassette interaction portions configured to engage in a snap-fit ​​connection with one or more corresponding cassette locking tabs on the cassette when the cassette is inserted into the injection device, and proximal movement of the release member prevents disengagement of the snap-fit ​​connection, thereby securing the cassette within the automatic injector.

[0116] In one or more examples of the automatic injector, the skin sensor spring system is adapted to urge the cassette skin sensor proximally to a longitudinal proximal position LP2 when the index ring is in the cap-release rotation position Rcr.

[0117] In one or more examples of the automatic injector, the skin sensor spring system is adapted to urge the cassette skin sensor proximally to a longitudinally proximal position when the indexing ring is in the second rotational position R2. When the skin sensor is pressed against the injection site, the skin sensor will be urged into / toward the longitudinally distal position LD. However, when the skin sensor is removed from the skin, the skin sensor spring system in the automatic injector will urge the skin sensor to the longitudinally proximal position when the indexing ring is in the second rotational position R2. This is true regardless of whether the indexing ring is in the cap removal rotational position Rcr or the delivery rotational position Rd.

[0118] In one or more examples of the automatic injector, after drug delivery and removal of the system from the delivery site, the skin sensor spring system is configured to maintain the skin sensor in the final longitudinal position LP3 during distal movement of the release member, thereby rotating the index ring from the delivery rotation position Rd to the first rotation position R1.

[0119] In one or more examples of the automatic injector, the index ring is in a first rotational position R1 before use, and when the index ring is moved from the first rotational position R1 to the cap-release rotational position Rcr by proximal movement of one or more release members, the skin sensor spring system is adapted to push the skin sensor to the intermediate position LP2.

[0120] In one or more examples of the automatic injector, the internal injection device component further includes a clutch configured to be movable between a first clutch position in which the plunger rod and the one or more release members are longitudinally coupled for proximal movement together, and a second clutch position in which the plunger rod is decoupled from the one or more release members, allowing the plunger rod to move longitudinally while the one or more release members are longitudinally stationary.

[0121] In one or more embodiments of the auto-injector, the one or more release members are coupled to the injection device housing in the second clutch position.

[0122] In one or more examples of the auto-injector, the clutch is in a first clutch position prior to use, and the clutch is configured to move from the first clutch position to the second clutch position when the index ring is rotated to the second rotational position R2 by proximal movement of one or more release members.

[0123] In one or more examples of the automatic injector, the clutch is configured to remain in the second clutch position when the index ring is in the second rotational position R2 and the plunger rod moves further proximally for delivery of the medicament.

[0124] In one or more examples of the automatic injector, the clutch is configured to move from the second clutch position to the first clutch position when the plunger rod moves distally after medicament delivery, whereby the index ring is rotated from the second rotational position R2 toward the first rotational position R1 by distal movement of the one or more release members when the clutch is in the first clutch position.

[0125] Longitudinal decoupling of the one or more release members from the plunger rod need not be directly coupled to rotational movement of the indexing ring. Thus, rotational movement of the indexing ring to the second rotational position R2 may occur before the one or more release members are released from the plunger rod. Thus, the one or more release members may continue longitudinal movement with the plunger rod a short distance before being decoupled from the plunger rod.

[0126] In one or more examples of the auto-injector, the clutch is a tubular clutch having one or more clutch tabs including a first surface of rotation and a second surface of rotation, and the internal injection device component includes a proximal chassis portion having a clutch coupling portion including one or more first coupling surfaces and one or more second coupling surfaces; When the second rotation surface of the clutch abuts the second engagement surface on the clutch engagement portion, the clutch is in a second clutch position; • When the second rotating surface of the clutch is not in contact with the second engaging surface on the clutch engaging portion, the clutch is in the first clutch position.

[0127] In one or more examples of the auto-injector, the plunger rod is configured to move longitudinally relative to a clutch, the clutch comprising: moving the second rotation surface proximally with the one or more release members before contacting the second coupling surface; and moving from the first clutch position to the second clutch position by pivoting when the second rotation surface contacts the second coupling surface.

[0128] In one or more examples of the auto-injector, the clutch coupling includes a clutch stop surface that abuts the clutch when the clutch is in the second clutch position, thereby preventing the clutch and the one or more release members from moving longitudinally with the plunger rod.

[0129] In one or more examples of the automatic injector, the plunger rod includes a stop clutch tab, a distal surface of which abuts a proximal surface of the one or more release members when the clutch is in the first clutch position.

[0130] In one or more examples of the auto-injector, the stop clutch tab is configured to move the clutch from the second clutch position to the first clutch position when distal movement of the plunger rod causes a distal surface of the stop clutch tab to contact a proximal surface of the one or more release members.

[0131] In one or more examples, the cassette further comprises a cassette housing including a cap retaining portion at a proximal end of the cassette housing, and a removable cassette cap including one or more locking cap portions extending distally from the proximal end of the cassette cap, wherein prior to use, each cassette cap locking protrusion of the one or more locking cap portions is secured within the cassette housing, and upon proximal movement of the skin sensor from the initial locking position LP1 to the intermediate position LP2, the distal locking end moves outside the cassette housing.

[0132] From a sustainability perspective, embedding any kind of metal and / or electronic components into a disposable device is not an ideal solution. Similarly, from an ease of use perspective, reusing cassette parts is also not an ideal solution, as it adds an additional user step and does not guarantee actual use. Therefore, the auto-injector and cassette combination described herein provides a very good overall solution, optimizing both sustainability and ease of use.

[0133] In one or more examples, the auto-injector further comprises a processor that controls the drive module.

[0134] In one or more examples, the drive module further includes a gear wheel and a motor configured to rotate a threaded rod within the plunger rod, thereby driving the plunger rod longitudinally.

[0135] In one or more embodiments, the processor is configured to control an applied force applied to a stopper in the syringe compartment.

[0136] All aspects of plunger movement are controllable through parameter settings in the device's firmware and can be configured to precisely suit the specific requirements of the therapy. The advantage of motor drive is that high forces can be applied in a well-controlled process, so delivery of even highly viscous drugs can be optimized while still minimizing needle size.

[0137] In one or more embodiments, the drive module further includes a battery, such as a rechargeable battery, adapted to be rechargeable, for example, from a USB charger. The battery may be a Li-ion cell battery.

[0138] The auto-injector may further include a Bluetooth low energy (BLE) connectivity option that can communicate selected information regarding, for example, plunger rod position to an app and a secure back end. A user interface with LEDs and / or audible prompts and / or displays may be included in the auto-injector.

[0139] It should be noted that all cassette and auto-injector details discussed above apply to all described aspects of the cassette, auto-injector, and systems including both components.

[0140] Various embodiments will now be described with reference to the drawings. Like reference numerals refer to like elements throughout. Therefore, like elements will not be described in detail with respect to the description of each figure. It should also be noted that the drawings are intended to facilitate the description of the embodiments. They are not intended as an exhaustive description of the claimed invention or as limiting the scope of the claimed invention. In addition, an illustrated example need not have all aspects or advantages shown. An aspect or advantage described in connection with a particular embodiment is not necessarily limited to that embodiment and may be implemented in any other embodiment, even if not so illustrated. [Brief explanation of the drawings]

[0141] [Figure 1A] 1 is an exploded view of a first example of a cassette extending along a longitudinal direction L. FIG. [Figure 1B] 1 is an exploded view of a first example of a cassette extending along a longitudinal direction L. FIG. [Figure 1C] FIG. 10 is a side view of the cassette housing. [Figure 2A] 1A-1C are diagrams of an auto-injector configured to receive a cassette such as that shown in FIGS. 1A-C, and are diagrams of an assembled injection device. [Figure 2B] 1A-1C are diagrams of an auto-injector configured to receive a cassette such as that shown in FIGS. 1A-C, showing surfaces within the auto-injector that contact the cassette. [Figure 2C] 1A-1C are diagrams of an auto-injector configured to receive a cassette such as that shown in FIGS. 1A-C, and are exploded views of the auto-injector. [Figure 3A] 10A-10C are diagrams of multiple longitudinal positions into which the skin sensor can move relative to the syringe holder. [Figure 3B] FIG. 10 is a diagram of the rotational positions between which the index ring can rotate. [Figure 4A]1A-B and the injection device release member shown in FIGS. 2C and 11A-D at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 4B] 1A-B and the injection device release member shown in FIGS. 2C and 11A-D at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 4C] 1A-B and the injection device release member shown in FIGS. 2C and 11A-D at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 4D] 1A-B and the injection device release member shown in FIGS. 2C and 11A-D at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 4E] 1A-B and the injection device release member shown in FIGS. 2C and 11A-D at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 4F] 1A-B and the injection device release member shown in FIGS. 2C and 11A-D at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 4G] 1A-B and the injection device release member shown in FIGS. 2C and 11A-D at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 4H] 1A-B and the injection device release member shown in FIGS. 2C and 11A-D at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 4I] 1A-B and the injection device release member shown in FIGS. 2C and 11A-D at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 5A] FIG. 10 is a diagram of the assembly of the syringe holder within the cassette as shown in the previous figure. [Figure 5B] FIG. 10 is a diagram of the assembly of the syringe holder within the cassette as shown in the previous figure. [Figure 5C] FIG. 10 is a diagram of the assembly of the syringe holder within the cassette as shown in the previous figure. [Figure 6A] A second example diagram showing the syringe holder, skin sensor, and index ring, as well as the injection device release member, at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 6B] A second example diagram showing the syringe holder, skin sensor, and index ring, as well as the injection device release member, at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 6C]A second example diagram showing the syringe holder, skin sensor, and index ring, as well as the injection device release member, at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 6D] A second example diagram showing the syringe holder, skin sensor, and index ring, as well as the injection device release member, at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 6E] A second example diagram showing the syringe holder, skin sensor, and index ring, as well as the injection device release member, at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 6F] A second example diagram showing the syringe holder, skin sensor, and index ring, as well as the injection device release member, at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 6G] A second example diagram showing the syringe holder, skin sensor, and index ring, as well as the injection device release member, at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 6H] A second example diagram showing the syringe holder, skin sensor, and index ring, as well as the injection device release member, at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 6I] A second example diagram showing the syringe holder, skin sensor, and index ring, as well as the injection device release member, at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 7A] FIG. 10 is a diagram of a third example of a syringe holder, a skin sensor, and an index ring. [Figure 7B] FIG. 10 is a diagram of a third example of a syringe holder, a skin sensor, and an index ring. [Figure 7C] FIG. 10 is a diagram of a cassette housing in the third example. [Figure 8A] 7A-B show the syringe holder, skin sensor, and index ring, and injection device release member of FIGS. 7A-B, in different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 8B] 7A-B show the syringe holder, skin sensor, and index ring, and injection device release member of FIGS. 7A-B, in different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 8C] 7A-B show the syringe holder, skin sensor, and index ring, and injection device release member of FIGS. 7A-B, in different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 8D] 7A-B show the syringe holder, skin sensor, and index ring, and injection device release member of FIGS. 7A-B, in different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 8E] 7A-B show the syringe holder, skin sensor, and index ring, and injection device release member of FIGS. 7A-B, in different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 8F]7A-B show the syringe holder, skin sensor, and index ring, and injection device release member of FIGS. 7A-B, in different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 8G] 7A-B show the syringe holder, skin sensor, and index ring, and injection device release member of FIGS. 7A-B, in different longitudinal skin sensor positions and index ring rotational positions as the injection device release member moves longitudinally within the index ring track. [Figure 8H] FIG. 10 is a cutaway view of the cassette housing and skin sensor, showing the skin sensor in an unlocked position. [Figure 8I] FIG. 10 is a cutaway view of the cassette housing and skin sensor, showing the skin sensor in final position LP3. [Figure 9A] 10A and 10B show the removal of the cassette cap from the cassette. [Figure 9B] 10A and 10B show the removal of the cassette cap from the cassette. [Figure 9C] 10A and 10B show the removal of the cassette cap from the cassette. [Figure 9D] 10A and 10B show the removal of the cassette cap from the cassette. [Figure 10A] 10A-10D are diagrams of the clutch engagement in different configurations during drug delivery. [Figure 10B] 10A-10D are diagrams of the clutch engagement in different configurations during drug delivery. [Figure 10C] 10A-10D are diagrams of the clutch engagement in different configurations during drug delivery. [Figure 10D] 10A-10D are diagrams of the clutch engagement in different configurations during drug delivery. [Figure 11A] FIG. 10B is a simplified version of FIG. 10A. [Figure 11B] FIG. 10C is a simplified version of FIG. 10B. [Figure 11C] FIG. 10B is a simplified version of FIG. 10C. [Figure 11D] FIG. 10D is a simplified version of FIG. [Figure 12A] FIG. [Figure 12B] FIG. [Figure 12C] FIG. 10 is a diagram of an injection device chassis with a clutch interaction portion. [Figure 12D] FIG. 10 is a diagram of an injection device chassis with a clutch interaction portion. [Figure 13A] 13A-13D show the locking of the cassette in the auto-injector. [Figure 13B] 13A-13D show the locking of the cassette in the auto-injector. [Figure 13C] 13A-13D show the locking of the cassette in the auto-injector. [Figure 13D] 13A-13D show the locking of the cassette in the auto-injector. [Figure 13E] 13A-13D show the locking of the cassette in the auto-injector. [Figure 14A] 10A-10C are diagrams of examples of syringe holders suitable for use with any of the above examples of cassettes. [Figure 14B] 10A-10C are diagrams of examples of syringe holders suitable for use with any of the above examples of cassettes. [Figure 14C] 10A-10C are diagrams of examples of syringe holders suitable for use with any of the above examples of cassettes. [Figure 14D] 10A-10C are diagrams of examples of syringe holders suitable for use with any of the above examples of cassettes. [Figure 14E] 10A-10C are diagrams of examples of syringe holders suitable for use with any of the above examples of cassettes. [Figure 15A] 14A-E, showing a syringe positioned within the syringe holder; FIG. [Figure 15B] 14A-E, showing a syringe positioned within the syringe holder; FIG. [Figure 15C] 14A-E, showing a syringe positioned within the syringe holder; FIG. [Figure 15D]14A-E, showing a syringe positioned within the syringe holder; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0142] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. In this regard, the embodiments may have different forms and should not be construed as limited to the description set forth herein. Accordingly, the embodiments are simply described below with reference to the drawings to illustrate aspects. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. A phrase such as "at least one element," when preceding a list of elements, modifies the entire list of elements, and not individual elements of the list.

[0143] In the drawings, the thicknesses of several layers and regions are shown in an exaggerated format for clarity and ease of illustration. When a layer, region, element, or plate is referred to as being "on" another layer, region, element, or plate, it may be directly on the other layer, region, element, or plate, or there may be intervening layers, regions, elements, or plates therebetween. Conversely, when a layer, region, element, or plate is referred to as being "directly on" another layer, region, element, or plate, there are no intervening layers, regions, elements, or plates therebetween. Furthermore, when a layer, region, element, or plate is referred to as being "under" another layer, region, element, or plate, it may be directly under the other layer, region, element, or plate, or there may be intervening layers, regions, elements, or plates therebetween. Conversely, when a layer, region, element, or plate is referred to as being "directly beneath" another layer, region, element, or plate, there are no intervening layers, regions, elements, or plates present.

[0144] The spatially relative terms "lower" or "bottom" and "upper" or "top," "below," "beneath," "less," "above," and the like may be used for ease of description to describe the relationship between one element or component and another element or component as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. For example, if a device shown in the figures is rotated, an element described as being on the "lower" side of other elements, or another element "below" or "lower," would be oriented on the "upper" side of, or "above," the other element. Thus, the exemplary terms "lower" or "lower" can encompass both "lower" and "upper" orientations, depending on the particular orientation of the figure. Similarly, if the device in one of the figures were turned over, elements described as "below" or "lower" of other elements would be oriented "above" the other elements. Thus, the exemplary terms "below" or "lower" can encompass both an orientation of above and below, and thus, spatially relative terms may be interpreted differently depending on the orientation described.

[0145] Throughout this specification, when an element is said to be "connected" to another element, the element may be "directly connected" to the other element or "electrically connected" to the other element with one or more intervening elements therebetween.

[0146] The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" may also be intended to include "at least one," unless the context clearly indicates otherwise. "At least one" should not be interpreted as limiting "a" or "an." It will be further understood that the terms "comprises," "comprising," "includes," and / or "including" specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0147] It will be understood that the terms "first," "second," "third," etc. may be used herein to describe various elements, but these elements should not be limited by these terms. These terms are used only to distinguish one element from another. Thus, a "first element" described below may be referred to as a "second element" or a "third element," and "second element" and "third element" may be similarly referred to without departing from the teachings of this specification.

[0148] As used herein, "about" or "approximately" encompasses stated values ​​and means within an acceptable range of deviation for a particular value as determined by one of ordinary skill in the art, and encompasses the error associated with the measurement and measurement of the particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, 20%, 10%, 5% of the stated value.

[0149] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0150] Illustrative examples are described herein with reference to cross-track cross-sectional views that are schematic illustrations of idealized embodiments, with like reference numerals referring to like elements throughout. As such, variations from the shapes of the illustrations are to be expected as a result, for example, of manufacturing techniques and / or tolerances. Accordingly, the embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include, for example, deviations in shape that result from manufacturing. For example, a region illustrated or described as flat may have rough and / or non-linear features. Furthermore, sharp angles illustrated may be rounded. Accordingly, regions illustrated in the figures are schematic in nature, and their shapes are not intended to illustrate the precise shape of the regions and are not intended to limit the scope of the present claims. To specifically illustrate exemplary embodiments of the present disclosure, some components not associated with the description may not be provided.

[0151] 1A-B show exploded views of cassette 100 extending along longitudinal direction L and syringe 200 attached to cassette 100. The difference between FIGS. 1A and 1B is in the size of syringe 200, with syringe 200 in FIG. 1A being larger than syringe 200 shown in FIG. 1B. When a thin syringe 200 is included in cassette 100, an additional syringe sleeve 250 is used to ensure that syringe 200 is sufficiently secured to cassette 100 during use.

[0152] Syringe 200 extends from a proximal end 202 to a distal end 204. Distal end 202 of syringe 200 includes a flange 220 that helps secure syringe 200 inside cassette 100. The medication is contained within a syringe compartment 206 that is in fluid communication with a syringe outlet 208. Inside syringe compartment 206 is a stopper 210 that, when moved proximally, forces the medication out of syringe outlet 208. Typically, stopper 210 is pushed proximally by a plunger rod included in an auto-injector to which cassette 100 having syringe 200 is attached.

[0153] In the illustrated example, syringe outlet 208 is a hollow needle attached to syringe compartment 206. Needle 208 may be detachable to the syringe compartment by means such as a threaded connection or a luer lock, or may be an integral part of syringe 200, as shown in FIGS. 1A-B. Syringe compartment 206 has a shoulder 218 at its proximal connection to syringe outlet 208. Positioned around syringe shoulder 218 is a needle shield 212, for example, a rigid needle shield. Needle shield 212 will typically be comprised of two parts: an inner portion 214 and an outer portion 216, as shown in FIG. 1B. Needle shield 212 protects the needle prior to use.

[0154] Syringe holder 300 extends from proximal end 302 to distal end 304 and has openings 306, 315 at both ends. Syringe 200 is mounted within syringe holder 300 through opening 315 at distal end 304 of syringe holder 300. When mounted in syringe holder 300, syringe compartment 206 is housed in syringe holder tubing 310, which has syringe holder tubing inspection opening 312 through which syringe 200 can be inspected. Distal end 304 of syringe holder 300 has distal tubular ring 314, which has an outer diameter larger than the outer diameter of syringe holder tubing 310. At its distal-most end is a hinged syringe holder lid 330 having a lid opening 332 with a diameter that allows passage of a plunger rod included in an auto-injector. The syringe holder lid 330 is closed when a syringe 200 is inserted into the cassette 100 during assembly, as shown in FIGS. 5A-C. After the syringe 200 is assembled within the syringe holder 300, when the hinged syringe holder lid 330 is closed, a lid locking tab 334 on the syringe holder lid 330 locks within a lid locking opening 318 on the distal tubular ring portion 314. FIGS. 5A-C illustrate assembly of the syringe holder 300 in the cassette 100 of FIGS. 5A-B. It should be understood that between FIGS. 5B and 5C, a syringe 200 can be inserted into the syringe holder 300.

[0155] The cassette 100 may be fully assembled, except for the closure of the syringe holder lid 330, for easy delivery to the user. Alternatively, the syringe holder lid 330 may be reopened after transport for attachment of the syringe 200. The user may then insert the syringe 200 and close the syringe holder lid 330. Other means for securing the syringe 200 within the syringe holder 300 may also be envisioned. For example, the syringe holder lid 330 may be replaced with flexible arms that bend inward to secure the syringe 200 after attachment within the syringe holder 300.

[0156] The proximal opening 306 in the syringe holder 300 has a diameter that allows the needle shield 212 to pass therethrough but prevents the syringe section 206 from passing therethrough. The proximal opening 207 has an inwardly extending support surface 308 for supporting the syringe shoulder 218.

[0157] The syringe sleeve 250 shown in FIG. 1B is used when the syringe compartment 206 has a diameter similar to that of the proximal opening 306 in the syringe holder 300. For example, to ensure that the syringe 200 does not pass through the proximal opening 306 when the needle shield is removed, the syringe 200 is attached to the syringe sleeve 250 and then positioned inside the syringe holder 300. The syringe sleeve 250 shown in FIG. 1B has a C-shape with a longitudinal mounting opening 258, which allows the syringe 200 to be mounted laterally within the syringe sleeve 250. The proximal end 252 of the syringe sleeve 250 has an inwardly protruding support surface 256 against which the syringe 218 rests. The needle shield 212 will be positioned outside the syringe sleeve 250 such that the inwardly protruding support surface 256 is disposed between the needle shield 212 and the syringe shoulder 218. When attached to the syringe sleeve 250, the syringe flange 220 will typically rest on the distal syringe sleeve support surface 260 at the distal end 254 of the syringe holder 250. The syringe 200 attached within the syringe sleeve 250 can be positioned within the syringe holder 300 through an opening 315 at the distal end 304 of the syringe holder 300 in the same manner as a larger syringe 200 is attached to the syringe holder 300. When attached to syringe holder 300 , proximal end 252 of syringe sleeve 250 rests on inwardly extending support surface 308 , with needle shield 212 extending proximally outside syringe holder 300 .

[0158] 1A and 1B are the same, including cassette housing 600, skin sensor 400, cap 700, index ring 500, and optionally cassette housing cover 800. Cassette housing cover 800 may be formed as an integral part of cassette housing 700.

[0159] The cassette housing 600 extends from a proximal end 602 to a distal end 604 and has an opening 606 at the distal end 602 through which the indexing ring 500, the skin sensor 400, and the syringe holder 300 are attached. When the cassette 100 is assembled, the cassette housing 600 at least partially, if not completely, encloses the syringe holder 300, the syringe 200 when positioned within the syringe holder 300, the skin sensor 400, and the indexing ring 500. The syringe holder 300 will typically be locked longitudinally and rotationally to the cassette housing 600. The cassette housing 600 has an inspection opening 610 on at least one surface side that allows a user to inspect the syringe compartment 206 containing the medication when the syringe 200 is attached within the cassette 100. Cassette 100 may be symmetrically configured so that it can be installed in the auto-injector in different orientations. Cassette locking tabs 612 are located at the distal end of the cassette housing. These can also be seen in FIG. 1C, which shows cassette housing 600 in a side view, where inspection opening 610 is also clearly visible. The locking mechanism is shown and described in FIGS. 13A-E.

[0160] The cassette cap 700 is removably attached to the cassette housing 600 at the proximal end 602 of the cassette housing 600. The cassette cap 700 includes an inner cassette cap portion 714 having a second distally extending portion 710 in the form of a tubular cap portion configured to grip the needle shield 212, for example, by a gripping portion 712 as shown in FIGS. 1A-B. When the cassette cap 700 is removed, the needle shield 212 is also removed, allowing for drug delivery. An outer cassette cap portion 716 surrounds the inner cassette cap portion 714, allowing a user to hold the outer cassette cap portion 716 when removing the cassette cap 700. The inner cassette cap portion 714 and the outer cassette cap portion 716 may also be formed as a single, integral piece. Also visible on the inner cassette cap portion 716 is a cap lock portion 706 having a cassette cap lock protrusion 708. Cap lock portion 706 with cassette cap lock protrusion 708 ensures that cassette cap 700 is securely fastened to cassette housing 600 before cassette 100 allows for removal of the cassette cap.

[0161] Positioned around the syringe holder 300 is a skin sensor 400 extending from a proximal end 402 to a distal end 404. The distal end 404 of the skin sensor 400 has a distal skin-contacting surface 405 that rests against the patient's skin during drug delivery. The proximal end 404 also has a proximal recess 406 into which a cassette cap locking protrusion 708 of the cassette cap 700 is secured prior to assembly of the cassette 100 into the auto-injector 1000 and prior to initiating release of the cassette cap 700 (see FIGS. 9A-D). The proximal recess 406 is adjacent to a protruding tab 408 connected by a proximal protruding ramp 410, as can be seen more clearly in FIGS. 9A-D.

[0162] The skin sensor 400 has a tubular skin sensor portion 420 from which a cassette skin sensor pin 422 extends distally. The tubular skin sensor portion 420 has a test opening 426 for testing the syringe 200. The skin sensor 400 typically has cassette skin sensor pins 422 symmetrically on either side of the skin sensor 400, as well as test openings 426 on either side.

[0163] The skin sensor 400 is rotationally locked relative to the syringe holder 300. The skin sensor 400 is movable in the longitudinal direction L relative to the syringe holder 300. The skin sensor 400 can be moved between a plurality of longitudinal positions relative to the syringe holder 300, including at least a proximal longitudinal position LP and a distal longitudinal position LD. As shown in FIG. 3A , there are three proximal positions LP in addition to the distal position LD. The three proximal positions LP include an initial locking position LP1, an intermediate position LP2, and a final locking position LP3. The proximal positions LP are all positions where the skin sensor 400 covers the syringe outlet 206 when the syringe 200 is attached to the cassette 100. When the skin sensor 400 is in the distal longitudinal position LD, the syringe outlet 206 is exposed. Proximal positions LP1, LP2, LP3 can be positions where skin sensor 400 is locked in at least one longitudinal direction relative to syringe holder 300. Thus, in the locked positions, proximal and / or distal movement of skin sensor 400 relative to syringe holder 300 is prevented. Whether a position is locked or not is determined by the rotational position of index ring 500, because skin sensor 400 and index ring 500 are coupled such that rotation of index ring 500 locks and releases skin sensor 400 for longitudinal movement in either the proximal and / or distal directions.

[0164] The skin sensor 400 also has a first locking recess 412 and a second locking recess 414 for interacting with and coupling to the index ring 500. A first locking tab 413 is located between the two locking recesses 412, 412, and a second locking tab 415 is located distally of the second locking recess 414. The second locking tab 415 is longer than the first locking tab 413. The distally facing surface of the second locking tab 415 is referred to as a first distal face 416. The skin sensor 400 also includes a proximally facing surface referred to as a first proximal face 418. The first proximal face 418 is proximal to the first locking recess 412.

[0165] The indexing ring 500 extends from a proximal end 502 to a distal end 504. The indexing ring 500 is positioned around and longitudinally locked to the syringe holder 300. The indexing ring 500 is rotationally movable relative to the skin sensor 400 / syringe holder 300 between a plurality of rotational positions, including at least a first rotational position R1 in which the skin sensor 400 is prevented from moving distally and a second rotational position R2 in which the skin sensor 400 is movable between a longitudinal distal position LD and a longitudinal proximal position LP. The rotational positions are illustrated in FIG. 3B, and as seen in FIG. 3B, two rotational positions, the cap-release rotational position and the delivery rotational position, are both included in the definition of the second rotational position R2 in which the skin sensor 400 is movable between the longitudinal distal position LD and the longitudinal proximal position LP (see also positions in FIGS. 4B-E).

[0166] The indexing ring 500 has two first longitudinal extensions 506 positioned opposite each other on the indexing ring 500. A tubular indexing ring portion 520 on the indexing ring 500 extends around the syringe holder 300. The indexing ring 500 includes a first radial extension 522, which may be part of a first radial extension 522 shown most clearly in FIGS. 4A-I. The first radial extension 522 has a first surface region 528 extending between a first proximal face 524 and a first distal face 526 (see, e.g., FIG. 4H). As shown in FIG. 4A, the first surface region 528 includes a track 530 extending from a first corner 532 of the surface region 528 to a second corner 534 of the surface region 528. The surface area 528 on the first radial extension 522 does not need to cover the entire surface of the first radial extension 522, but instead may be a smaller area defined by two corners 532, 534 between which the track 530 extends.

[0167] The track 530 extends from a first corner 532 to a second corner 534 at an angle of 20 to 70 degrees, for example 30 to 60 degrees, for example 35 to 55 degrees, for example 40 to 50 degrees, for example approximately 45 degrees, relative to the longitudinal direction of the cassette. In track 530m, which is most clearly shown in Figures 4A-I, the track 530 includes a first track section 536, a second track section 538, and a third track section 540. As shown most clearly in FIG. 4I, the first track section 536 extends from the first corner 532 in a first angular direction toward a first midpoint 542, the second track section 538 extends in a second angular direction along the length of the cassette from the first midpoint 542 to a second midpoint 544, and the third track section 540 extends from the second midpoint 544 in a third angular direction toward the second corner 534.

[0168] The first angular direction and / or the third angular direction are typically oblique directions, and have an angle of 20 to 70 degrees, for example, 30 to 60 degrees, for example, 35 to 55 degrees, for example, 40 to 50 degrees, for example, approximately 45 degrees, relative to the longitudinal direction of the cassette. The second track section 538 is typically a plateau track section having a second angular direction of -20 to 20 degrees, for example, -10 to 10 degrees, for example, approximately 0 degrees, relative to the longitudinal direction of the cassette.

[0169] On the first longitudinal extension 506 of the index ring 500 is a second radial extension 512. The second radial extension 512 forms a locking tab 507 configured to mate with two locking recesses 412, 414 on the skin sensor 400. The locking tab 507 has a second proximal surface 514 and a second distal surface 516 of the second radial extension 512.

[0170] The position of the locking tab 507, and therefore the rotational position of the indexing ring 500 relative to the skin sensor 400, is controlled by one or more release members 1006 within the auto-injector 1000 when the cassette 100 is secured within the auto-injector 1000. More specifically, the indexing ring 500 is configured to rotate from a first rotational position R1 to a second rotational position R2 when the cassette 100 is inserted into the auto-injector 1000 and a track guide protrusion 1008 included in the auto-injector moves proximally within the track 530. When the track guide protrusion 1008 again moves distally, the indexing ring 500 rotates from the second rotational position R2 back to the first rotational position R1. Thus, by retracting the release members 1006 / track guide protrusions 1008 back into the auto-injector, the indexing ring is rotated back to its initial position. 3B and 4B-E, two rotational positions, the cap-release rotational position and the delivery rotational position, are both included in the definition of the second rotational position R2, at which the skin sensor 400 is movable between the longitudinal distal position LD and the longitudinal proximal position LP. Thus, the second rotational position R2 need not be a position at which the index ring 500 cannot rotate any further. The second rotational position can also be an intermediate position at which the skin sensor 400 is unlocked but still prevented from moving to the most proximal and / or most distal positions possible.

[0171] 2A-B show the auto-injector in an assembled view, and FIG. 2C shows an exploded view of the auto-injector 1000 configured to receive the cassette 100. The auto-injector 1000 extends along a longitudinal axis L from a proximal end 1002 to a distal end 1004 and comprises an injection device housing 1040 and a number of internal injection device components positioned within the injection device housing 1040.

[0172] The cassette 100 is removably received within the auto-injector 1000 along a longitudinal direction L. Typically, the cassette 1000 will be received at the proximal end 1002 of the auto-injector 1000, thereby making the cassette 1000 a front-loading auto-injector. In FIG. 2B, an interior view of the injector (injection device) 1000 shows a cassette abutment surface 1042 against which the cassette 100 rests when assembled within the injector 1000. The view in FIG. 1B also shows openings in the cassette abutment surface 1042 through which internal injection device components extend during drug delivery and during preparation steps leading to drug delivery. The openings include a cassette detector pin opening 1081 through which the cassette detector pin 1080 extends, a skin sensor pin opening 1028 through which the infusion device skin sensor pin 1024 extends, and a release member opening 1043 through which the release member 1006 extends. A cassette locking tab 1086 on the inside of the injection device housing 1040 for securing the cassette 100 inside the auto-injector 1000 can also be seen in FIG. 1B.

[0173] 1C, the internal injection device component includes a plunger rod 1018 configured to move proximally for delivery of the medication. The plunger rod 1018 has an internal threaded surface that threadingly engages an external threaded surface of a threaded rod 1014 positioned inside the plunger rod 1018. Rotation of the internal threaded rod 1014 of the plunger rod 1018 causes the plunger rod 1018 to move proximally or distally along the longitudinal axis L, depending on which direction the threaded rod 1014 is rotated.

[0174] The auto-injector 1000 includes a release member 1006 having two release member pins 1007, each with a track guide protrusion 1008 (see also FIGS. 11A-D). When the auto-injector 1000 is actuated after the cassette 100 is attached to the auto-injector 1000, the release member 1006 travels inside the indexing ring track 530, thereby rotating the indexing ring 500. The release member pin 1007 is connected by a release member bridge 1010 to a plunger rod opening 1012 that allows the plunger rod 1018 to pass through for medication delivery.

[0175] The release member 1006 and plunger rod 1018 are connected to a clutch 1030 that is configured to move between a first clutch position, in which the plunger rod 1018 and one or more release members 1006 are longitudinally coupled to move proximally together, and a second clutch position, in which the plunger rod 1018 is decoupled from the one or more release members 1006, allowing the plunger rod 1018 to move longitudinally while the one or more release members 1006 are longitudinally stationary. This interaction is shown and described in more detail in Figures 10-12.

[0176] The auto-injector 1000 further comprises an infusion device skin sensor pin 1024 and a skin sensor spring system 1026 that urges the infusion device skin sensor pin 1024 proximally. When the cassette 100 is attached to the auto-injector 1000, the skin sensor 400 is free to move proximally and the infusion device skin sensor pin 1024 urges the skin sensor 400 proximally when the user is not simultaneously urging the skin sensor distally. Typically, the infusion device skin sensor pin 1024 will abut one of the cassette skin sensor pins 422 in the skin sensor 400.

[0177] Further inside the automatic injector 1000 are a cassette detection pin 1080 and a cassette detection spring 1082, which detects when the cassette 100 is attached to the automatic injector 1000 by contacting other cassette skin sensor pins 422 in the skin sensor 400.

[0178] 2A , the injection device housing 1040 has a distal housing section 1044 that covers the internal injection device components and a proximal cassette cover section 1046 that at least partially covers the cassette 100 when the cassette 100 is attached to the auto-injector 1000. When the cassette 100 is attached to the auto-injector 1000, the distal end 104 of the cassette 100 abuts against a cassette abutment surface 1042 on the inside of the auto-injector 1000.

[0179] The internal injection device components also include a drive module adapted to move the plunger rod 1018 in a proximal direction. The drive module may be constructed in several ways, of which the solution shown in Figure 2C is just one example. The drive module shown in Figure 2C includes a motor 1076 and motor gear wheel 1078 for rotating the threaded rod 1014 inside the plunger rod 1018, a battery 1056 that can be recharged, for example, from a USB charger accessible via a USB gasket 1068, and several chassis parts 1070, 1077, 1090, 1094, 1095 and a screw 1079 for supporting the drive module components.

[0180] The auto-injector 1000 may further include a processor that controls the drive module, which processor includes a printed circuit board (PCB) 1054. Visual display signals to the user may be included in the form of light emitting diodes (LEDs) 1064 that may be positioned in PCB placeholders 1062 or the like. The LEDs are displayed via the LED window frame 1050, the light box placeholder 1058, and the light guide placeholder 1060.

[0181] The auto-injector may be activated by depressing an activation button 1052 located on the user interface housing portion 1048. A protective foil 1049 is typically included to protect the electronic components inside the injector 1000. See the reference numbers for other internal injection device components.

[0182] 4A-I show the syringe holder 300, skin sensor 400, index ring 500, and injection device release member 1006 in different skin sensor longitudinal positions and index ring rotational positions as the injection device release member 1006 moves longitudinally within the index ring track 530.

[0183] 4A shows the initial locked position, in which cassette 100 is in a pre-use state. Locking tab 507 on indexing ring 500 is secured within first locking recess 412 on skin sensor 400, thereby preventing longitudinal movement of skin sensor 400 relative to syringe holder 300. Skin sensor 400 is in initial locked position LP1, and indexing ring 500 is in first rotational position R1. The first rotational position can also be considered a locked rotational position because it always longitudinally locks skin sensor 400 in one of the longitudinal proximal positions.

[0184] FIG. 4B shows the cap-release position, in which the cassette cap 700 can be removed from the cassette 100 (see the description of FIGS. 9A-D for further details). Between FIGS. 4A and 4B, the autoinjector track guide protrusion 1008 on the injection device release member 1006 moves through the injection device release member opening 322 into the indexing ring track 530 and along it into the first track section 536, which in FIG. 4B is within the second plateau track section 538. This rotates the indexing ring 500 to the cap-release rotation position Rcr, in which the locking tab 507 is released distally from the first locking recess 412, allowing the skin sensor to move proximally until the locking tab 507 abuts the second locking tab 415, which is longer than the first locking tab 413 and secures the locking tab 507 inside the first locking recess 412 of FIG. 4A. FIG. 4B shows the position of the skin sensor 400 after release, but before the skin sensor 400 moves from the initial locked position LP1 to the ready-to-remove-cap position LP2.

[0185] In FIG. 4C , the skin sensor 400 has moved just short of intermediate position LP2, where the cassette cap 700 can be removed. The indexing ring 500 is still in the cap-release rotation position Rcr, and the locking tab 507 abuts against the second locking tab 415, ensuring that the skin sensor 400 is prevented from further proximal movement during cassette cap removal. However, the skin sensor 400 can be moved distally by the user. This is shown in FIG. 4D , where the skin sensor has been pushed into the longitudinal distal position LD, and the needle 208 is no longer covered by the skin sensor 400 but is instead inserted into the infusion device site. The second proximal surface 514 on the second radial extension 512 / locking tab 507 abuts against the second distal surface 424 on the skin sensor 400, thus preventing further distal movement of the skin sensor 400.

[0186] As shown in FIG. 4D , when the skin sensor 400 is pushed into the longitudinally distal position LD, the autoinjector track guide protrusion 1008 is ready for further proximal movement within the indexing ring track 530. As it moves along the third track section 540, the indexing ring 500 is rotated to the delivery rotation position Rd, as shown in FIG. 4E . When the autoinjector track guide protrusion 1008 reaches this position within the indexing ring track 530, the injection device release member 1006 is decoupled from the plunger rod 1018 by the clutch 1030 within the autoinjector 1000. As a result, the plunger rod 1018 is permitted further proximal movement for medication delivery while the injection device release member 1006 remains in the position shown in FIG. 4A .

[0187] After drug delivery, the user removes the skin sensor from the skin, and the infusion device skin sensor pin 1024 and skin sensor spring system 1026 ensure that the skin sensor is first pushed to the intermediate position LP2 shown in FIG. 4F and finally pushed to the final position LP3 shown in FIG. 4G. When the skin sensor 400 is in the final position LP3, as shown in FIG. 4G, the plunger rod 1018 moves distally and reconnects with the infusion device release member 1006 upon reaching the same connection point where it was disconnected during drug delivery. The plunger rod 1018 and the infusion device release member 1006 move distally together, which again rotates the index ring 500 from the delivery rotation position Rd to the first rotation position R1. When the index ring 500 is once again in the first rotation position R1, the skin sensor 400 is now longitudinally locked in the final position LP3, as shown in FIG. 4H. Locking tab 507 now abuts first distal surface 416 on second locking tab 415 .

[0188] 4I shows the locked position, in which the auto-injector will push the cassette into its locked position if the user removes the cassette cap when the cassette was configured as shown in FIG. 4C but, for some reason, is prevented from continuing the drug delivery process by inserting the needle into the infusion site by pushing the skin sensor 400 distally. If this occurs, the auto-injector may be programmed to move the infusion device release member 1006 distally after a predetermined period of time, causing the indexing ring 500 to rotate to the first rotational position R1, thereby locking the skin sensor in the intermediate position LP2, where the locking tab 507 is secured within the second locking recess 414 on the skin sensor 400. Because the infusion needle 208 may have been contaminated after removing the needle shield 212 when the cassette cap 700 was removed, if the user attempts to reattach the cassette 100 to the auto-injector 1000, the cassette 100 will be considered a used cassette.

[0189] 6A-I show a second example of the syringe holder 300, skin sensor 400, index ring 500, and infusion device release member 1006 at different longitudinal skin sensor and index ring rotational positions as the infusion device release member 1006 moves longitudinally within the index ring track 530. The positions shown are the same in Figures A-I for the example shown in Figures 4 and 6. That is, Figure 6A shows the initial locked position with the cassette 100 in a pre-use state, Figure 6B shows the cap release position, Figure 6C shows the skin sensor in an intermediate position LP2 from which the cassette cap 700 can be removed, Figure 6D shows a position where the skin sensor has been pushed into the longitudinal distal position LD but the index ring has not yet been fully rotated for delivery, Figure 6E shows the delivery position, Figure 6F shows the intermediate position after delivery, Figure 6G shows the final position LP3 before locking, and Figure 6H shows the final locked position. FIG. 6I shows the locked position, in which the automatic injector pushes the cassette into the locked position if the user removes the cassette cap when the cassette is configured as shown in FIG. 6C but for some reason is prevented from continuing the drug delivery process by inserting the needle into the injection site by pushing the skin sensor 400 distally.

[0190] The difference between Figures 4A-I and Figures 6A-I is the design and configuration of skin sensor 400 and index ring 500. In Figures 6A-I, index ring 500 has a second longitudinal extension 518, with longitudinal extensions 516, 518 and radial extensions 512, 522 forming a rectangle. Inside the rectangle on first longitudinal extension 506 are first recess 508 and second recess 510. These recesses are configured to receive protruding tab 408 on skin sensor 400. In initial locking position LP1 as shown in Figure 6A, protruding tab 408 is received within first recess 508. When the skin sensor 400 is in the intermediate position LP2, the protruding tab 408 is within or above the second recess 510 when the indexing ring is rotated to the first rotational position as shown in FIG. 6I, but is supported proximally by the second distal surface 516 of the second radial extension 512, thereby preventing further proximal movement during cap removal as shown in FIG. 6C. When drug delivery occurs, the indexing ring 500 is rotated so that the protruding tab 408 is aligned with the opening 513 in the second radial extension 512, allowing the protruding tab 408 to pass through the opening 513 in the second radial extension 512 to the proximal-most position, i.e., the final position LP3, when the skin sensor 400 is removed from the infusion site. This alignment is shown in FIGS. 6E-G. When the index ring 500 rotates back to the first rotational position R1, the protruding tab 408 abuts the second proximal surface 514 of the second radial extension 512, preventing exposure of the needle 208 after drug delivery, as shown in FIG. 6H.

[0191] Figures 7 and 8 show a third example of a cassette, with Figures 7A-B showing the syringe holder 300, skin sensor 400, and index ring 500, Figure 7C showing the cassette housing 600, Figures 8A-G showing the syringe holder 300, skin sensor 400, index ring 500, and injection device release member 1006 at different longitudinal skin sensor positions and index ring rotational positions as the injection device release member 1006 moves longitudinally within the index ring track 530, and Figures 8H-I showing cross-sectional views of the cassette housing 600 and skin sensor 400, showing the skin sensor 400 in the unlocked position (Figure 8H) and the skin sensor 400 in the final position LP3 (Figure 8I).

[0192] The differences between Figures 4A-I and 6A-I and Figures 7A-C and 8A-I are the design and configuration of the skin sensor 400 and indexing ring 500, the shape of the release member 1006 within the syringe 1000, and the locking of the skin sensor 400 in the final locked position LP3. In the third example, the track 530 is positioned on the first longitudinal extension 506, which is attached to the outside of the tubular indexing portion 520. The track 530 is an open track. On the inner surface of the longitudinal extension 506 are a first recess 508', a second recess 510', and an indexing ring ramp 509 extending distally from the first recess 508'. The skin sensor 400 has a protruding tab 408, which is captured within the first recess 508' prior to use (us), as shown in Figure 8A. After the indexing ring 500 is rotated to the cap-release rotation position Rcr as shown in FIG. 8B, the skin sensor 400 moves to the cap-removal position as shown in FIG. 8C. The cassette cap 700 and needle shield 212 can be removed as shown in FIG. 8C. In the position shown in FIG. 8C, the protruding tab 408 rests against the second distal surface 516 of the second radial extension 512. During distal movement of the skin sensor 400 by the user for needle insertion at the injection site, the indexing ring 500 is rotated to the delivery rotation position Rd as shown in FIG. 8D. Thus, in the third example shown in FIGS. 7A-B and 8A-G, the release member 1006 is not the object that rotates the indexing ring from the cap-release rotation position Rcr to the delivery rotation position Rd. Instead, the protruding tab 408 contacts the indexing ring ramp 509, thereby rotating the indexing ring 500. As shown in FIG. 8E, during drug delivery, the release member 1006 moves further into the cassette 100. After drug delivery is complete, the skin sensor 400 moves to a final position LP3 by spring force from the skin sensor pin spring system 1024, 1026 within the syringe 1000. This is shown in Figure 8F. In the position shown in Figure 8G, the skin sensor 400 is in a final locked position.In final locked position LP3, skin sensor 400 is pushed proximally by a spring system and locked into a locked position within cassette housing 600, as described in the previous embodiments of the cassette and auto-injector. Locking is achieved by cassette housing locking protrusion 428 on skin sensor 400 fitting into skin sensor locking opening 614 in cassette housing 600, as shown in FIG. 81. In the position shown in FIG. 8H, skin sensor 400 is in an unlocked position. Skin sensor locking opening 614 in cassette housing 600 is most clearly seen in FIG. 7C.

[0193] Also shown in FIG. 7A is an alternative securing of syringe 200 within syringe holder 300, in which two flexible syringe securing tabs 320 move from an open position to a closed position to secure syringe 200 within syringe holder 300.

[0194] 9A-D illustrate removal of the cassette cap 600 from the cassette 100. The cassette cap 700 has a locking cap portion 706 extending distally from the proximal end 702 of the cassette cap 700. Prior to use, a cassette cap locking protrusion 708 on each of the one or more locking cap portions 706 is secured to the inside of the cassette housing 600 by a cap retaining portion 608 extending radially inward at the proximal end 602 of the cassette housing 600. At the proximal end 402 of the skin sensor 400, the skin sensor 400 has a lamp 410 and a recess 406 positioned distally of the lamp 410. The lamp 410 typically forms a protruding tab 408. The inwardly extending portion 709 of the cassette cap locking protrusion on each of the locking portions 706 is secured between the recess 406 of the skin sensor 400 and the cap retaining portion 608, and further abuts the proximal protruding ramp 410 to prevent proximal movement of the cassette cap 600 prior to use, as shown in FIG. 9A. This locks the cassette cap 700 to the cassette 100 and prevents the cassette cap 700 from being removed from the cassette 100 before the cassette 100 is assembled inside the auto-injector 1000.

[0195] The cap lock portion 706 and / or the cassette cap lock protrusion 708 on each of the one or more cap lock portions 706 are flexible. During proximal movement of the skin sensor 400 from the initial lock position LP1 to the intermediate position LP2, the cap lock portion 706 and / or the cassette cap lock protrusion 708 on the lock portion 706 initially bend slightly radially inward within the recess 406 of the skin sensor 400, thereby allowing the cassette cap lock protrusion 708 to pass proximally through the cap retainer 608. When the skin sensor 400 is moved from the initial lock position LP1 to the intermediate position LP2, the distal lock end 708 thereby moves outward from the cassette housing 600, as shown in FIG. 9B . The locking portion 706 and / or the cassette cap locking protrusion 708 on the locking portion 706 are configured to flex so that when the user removes the cassette cap 700 from the cassette 100, the locking portion 706 and / or the cassette cap locking protrusion 708 on the locking portion 706 now flex radially outward, sliding the ramp 410 up. This is shown in FIG. 9C. The cassette cap 700 with the needle shield 212 inside may be positioned over the skin sensor 400 after use to provide additional security preventing access to the used needle. This is shown in FIG. 9D. The cassette cap 700 is not permanently connected to the cassette 100 again, but rather will remain in that position unless pulled out again by the user.

[0196] 10A-D and 11A-D show the engagement and disengagement of the clutch in syringe 1000, FIGS. 12A-B show clutch 1030 in detail, and FIGS. 12C-D show proximal chassis portion 1070 in detail.

[0197] The clutch 1030 is positioned around the plunger rod 1018 adjacent to the release member 1006, and in a first clutch position shown in Figures 10A-B and 11A-B, the plunger rod 1018 and the release member 1006 are longitudinally coupled and move proximally together. The clutch 1030 is a tubular clutch having two clutch tabs 1032, each having a first rotation surface 1034 and a second rotation surface 1036. The proximal chassis portion 1070 has clutch coupling portions 1071 on each of small distal extensions 1075, each having a first coupling surface 1072 and a second coupling surface 1073.

[0198] When the second rotation surface 1036 on the clutch 1030 contacts the second coupling surface 1073 on the clutch coupling portion 1071, the clutch rotates from the first clutch position to the second clutch position, as shown in Figures 10C-D and 11C-D. In the second clutch position, the plunger rod 1018 is disengaged from the release member 1006, allowing the plunger rod 1018 to move longitudinally while the release member 1006 remains longitudinally stationary. When the second rotation surface 1036 on the clutch is not in contact with the second coupling surface 1073 on the clutch coupling portion 1071, the clutch is in the first clutch position. The clutch 1030 moves proximally with the release member 1006 before the second rotating surface 1036 contacts the second connecting surface 1073, and rotates about an axis when the second rotating surface 1036 contacts the second connecting surface 1073, thereby moving from the first clutch position to the second clutch position.

[0199] The clutch coupling portion 1071 also includes a clutch stop surface 1074 that abuts against the clutch 1030 when the clutch 1030 is in the second clutch position to prevent the clutch 1030 and the release member 1006 positioned distally of the clutch 1030 from moving proximally together with the plunger rod 1018.

[0200] The plunger rod 1018 includes a stop clutch tab 1019, the distal surface of which abuts the proximal surface of the release member 1006 when the clutch 1030 is in the first clutch position as shown in Figures 10A-B and 11A-B. The stop clutch tab 1019 rotates the clutch 1030 from the second clutch position to the first clutch position upon distal movement of the plunger rod 1018 after drug delivery, bringing the distal surface of the stop clutch tab 1019 back into contact with the proximal surface of the member 1006.

[0201] The clutch 1030 may be configured to move from the first clutch position to the second clutch position when the plunger rod 1018 moves distally after drug delivery. The clutch 1030 is in the first clutch position prior to use and typically moves to the second clutch position when the indexing ring 500 is also rotated to the delivery rotation position Rd by proximal movement of the one or more release members 1006.

[0202] When assembling the cassette 100 and the auto-injector 1000, the cassette 100 is first loaded into the auto-injector 1000. When the cassette 100 is loaded into the auto-injector 1000, the cassette locking tab 612 on the distal end 604 of the cassette housing 600 snaps behind a corresponding cassette locking opening 1028 in the injection device housing 1040. Forward movement of the release member 1006 prevents the cassette locking tab 612 from deflecting and from exiting the cassette locking opening 1028 in the injection device housing 1040, thereby locking the cassette 100 to the auto-injector 1000. The cassette 100 is now securely locked inside the auto-injector 1000. When the cassette release member 1006 is again moved distally, the cassette 100 is unlocked. The locking process is illustrated in Figures 13A-E, where Figures 13A-C show the cassette being inserted into the injector 1000 and engaging the snap-fit ​​connection. Figures 13D-E show the release member 1006 moving into the cassette 100, thereby locking the cassette 100 to the injector 1000. Thus, the injector includes one or more cassette interaction portions 1086 configured to engage in a snap-fit ​​connection with one or more corresponding cassette locking tabs 612 on the cassette 100 when the cassette is inserted into the injector, and proximal movement of the release member 1006 prevents disengagement of the snap-fit ​​connection, thereby securing the cassette inside the auto-injector. The locking mechanism illustrated in Figures 13A-E may alternatively be replaced with a similar lock rotated 90 degrees.

[0203] 14A-E show one example of a syringe holder 300 suitable for use with any of the above-described examples of cassette 100. FIGS. 15A-D show the syringe holder 300 of FIGS. 14A-E with a syringe 200 positioned therein. Syringe holder 300 extends in a longitudinal direction L from a proximal end 302 to a distal end 304, as shown in FIGS. 1A-B. Syringe holder 300 includes a syringe holder tubular portion 310 for receiving syringe 200 and a syringe holder lid 330 having a slightly different shape compared to that shown in the previous example.

[0204] The holder lid 330 has a substantially C-shaped lid portion 336 having an inner surface 340. The C-shaped lid portion 336 may also be referred to as an open circle or a circle with an incision opening 337 around its periphery. The incision opening 337 may cover an area of ​​at least 10%, e.g., at least 20%, e.g., at least 30% of the complete circular circumference. The substantially C-shaped lid portion 336 is hingedly connected to the distal end of the syringe holder tubular portion 310. By hingedly connected, it is meant that the substantially C-shaped lid portion 336 can be in at least two positions, as shown in FIG. 14A compared to FIGS. 14C-E and 15A-D.

[0205] In FIG. 14A, the syringe holder lid 330 is in an open position, allowing the syringe 200 to be positioned within the syringe holder 300 through the opening 315 at the distal end of the syringe holder tubular portion 310 .

[0206] 14C-E and 15A-D, syringe holder lid 330 is in a closed position, and syringe holder lid 330 prevents syringe 200 from exiting syringe holder 300 through the opening at the distal end of syringe holder tubular portion 310. This is also seen in Figures 15A-D.

[0207] A plurality of lid locking tabs 334 extend radially outward from the substantially C-shaped lid portion 336. The locking tabs 334 are positioned within corresponding syringe holder lid locking openings 318 in the syringe holder tubular portion 310 when the substantially C-shaped lid portion 336 is in the closed position, as shown in Figures 14B-E. Typically, each of the plurality of lid locking tabs 334 fits within a separate one of the syringe holder lid locking openings 318.

[0208] The inner surface 340 of the substantially C-shaped cap 336, most clearly seen in FIG. 14A , is oriented toward the syringe 200 when the syringe 200 is positioned within the syringe holder 300. A plurality of support caps 338 extend from the inner surface 340. In the example shown in FIGS. 14-15 , there are four support caps 338, although more or fewer may be present. Compared to the overall surface area of ​​the inner surface 340, the support caps 338 cover less than 50%, e.g., less than 40%, e.g., less than 30%, e.g., less than 20%, e.g., less than 10%. Having a fractured surface structure on the surface that the syringe may contact ensures that not all of the support cap 338 will come into contact with the syringe if the user unevenly presses the syringe 200 proximally. This ensures that the pressing force is not transmitted to the entire substantially C-shaped cap 336. Should the user succeed in pushing the syringe 200 hard enough to force one of the locking tabs 334 out of the syringe holder lid locking opening 318, the other locking tabs 334 will have an increased tendency to remain in place, thereby increasing the security of preventing the syringe 200 from being forced out of the distal end of the syringe holder.

[0209] As shown in Figures 15A-D, when the syringe 200 is correctly positioned within the syringe holder tubular portion 310, the syringe 200 is not in direct contact with the syringe holder lid 330. The syringe 200 only comes into contact with the syringe holder lid 330 when pushed distally during use. Thus, the syringe holder lid 330 has a safety function and not a syringe securing or retaining function. In Figure 15C, the empty space at the distal end 204 of the syringe 200, i.e., between the syringe flange and the support lid 338, is most clearly visible.

[0210] The substantially C-shaped lid 336 also has a through channel 342 that divides the substantially C-shaped lid into two lid sections. The channel 342 does not divide the C-shaped lid 336 into two completely separate parts; instead, the two sections are connected by a bridge portion 344, which also forms a hinged connection to the distal end of the syringe holder tubular portion 310. This is most clearly seen in FIGS. 14A-C . The first and second lid sections are at least partially displaceable relative to one another along the longitudinal axis. This means that one section may be twisted or pushed distally or proximally without causing the other section to move to the same extent. The flexibility of the substantially C-shaped lid 336 further ensures that if a user pushes the syringe 200 unevenly from the proximal direction, only a portion of the substantially C-shaped lid 336 is affected, as the force is not easily transferred around the substantially C-shaped lid 336. [Explanation of symbols]

[0211] 100 cassettes 102 Proximal end of cassette 104 Distal end of cassette 200 syringes 202 Proximal end of syringe / proximal end of syringe compartment 204 Distal end of syringe / distal end of syringe compartment 206 Syringe Compartment 208 Hollow needle / syringe outlet 210 Stopper 212 Needle Shield / RNS 214 Inner part of needle shield 216 Outer part of needle shield 218 Syringe flange 220 Syringe Shoulder 250 Syringe Sleeve 252 Proximal end of syringe sleeve 254 Distal end of syringe sleeve 256 Inwardly protruding support surface of syringe sleeve 258 C-shaped longitudinal mounting opening 260 Distal syringe sleeve support surface 300 Syringe Holder 302 Proximal end of syringe holder 304 Distal end of syringe holder 306 Proximal opening of syringe holder 308 Syringe Support Surface 310 Syringe holder tubular part 312 Syringe holder tubular part inspection opening 314 Distal tubular ring 315 Opening at the distal end of the syringe holder 316 Proximal index ring support surface 318 Syringe holder lid lock opening 320 Syringe-Securing Flexible Tab at Distal End of Syringe Holder 322 Injection release member opening 330 Syringe holder lid 332 Syringe holder lid opening 334 Lid lock tab 336 C-shaped lid 337 C-shaped lid opening 338 Support lid part 340 Inner surface of C-shaped lid 342 C-shaped lid channel 344 Bridge section 400 Skin Sensors 402 Proximal end of skin sensor 404 Distal end of skin sensor 405 Distal skin contact surface of skin sensor 406 Proximal Recess 408 protruding tab 410 Proximal Projecting Ramp 412 First locking recess on skin sensor 413 First Lock Tab 414 Second locking recess on skin sensor 415 Second Locking Tab 416 First distal surface 418 First proximal surface 420 Tubular skin sensor part 422 Cassette Skin Sensor Pin 424 Second distal surface 426 Skin sensor test opening 428 Cassette housing lock protrusion 500 index ring 502 Proximal end of index ring 504 Distal end of index ring 506 first longitudinal extension 507 Lock Tab 508, 508' First recess on index ring 509 Index Ring Lamp 510, 510' Second recess on index ring 512 second radial extension 513 opening of second radially extending portion 514 second proximal surface of second radial extension 516, 516' second distal surface of second radial extension 518 second longitudinal extension 520 Tubular index ring part 522 first radial extension 524 first proximal surface of first radial extension 526 first distal surface of first radial extension 528 first surface area of ​​first radial extension 530 Track in the first radial extension 532 first corner of first radially extending portion 534 second corner of first radially extending portion First section of 536 track 538 Second Section of Track 540 Third Section of Track 542 First Waypoint of Track 544 Second Waypoint of Track 600 cassette housing 602 Cassette Housing Proximal End 604 Distal end of cassette housing 606 Opening at distal end of cassette housing 608 Cap holder 610 Inspection opening 612 Cassette fixing tab 614 Skin sensor lock opening 700 cassette caps 702 Cassette Cap Proximal End 704 Distal end of cassette cap 706 Cap lock part 708 Cassette cap track guide protrusion / Cassette cap lock protrusion 709 Inward extension of cassette cap lock protrusion 710 Second distal extension / tubular cap portion 712 Gripping part 714 Inner cassette cap part 716 Outer cassette cap part 800 Cassette Housing Cover 1000 Automatic syringe (automatic injection device) 1002 Proximal end of auto-injector 1004 Distal end of auto-injector 1006 Release member 1007 Release member pin 1008 Track guide protrusion 1010 Release member bridge 1012 Plunger rod opening 1014 Threaded Rod 1016 Motor and Threaded Rod Connector 1018 Plunger Rod 1019 Stop Clutch Tab 1020 first plunger rod plug portion 1022 second plunger rod plug portion that engages with the stopper 1024 Injection device skin sensor pin 1026 Skin Sensor Spring System 1028 Skin sensor pin opening at cassette contact surface 1030 clutch 1032 Clutch tab 1034 First surface of rotation on clutch tab 1036 Second surface of rotation on clutch tab 1040 injection device housing 1042 Cassette contact surface 1043 Release member opening in cassette abutment surface 1044 Distal Housing Section 1046 Cassette Cover Section 1048 first user interface housing portion 1049 Protective foil 1050 LED window frame 1052 operating button 1054 Printed Circuit Board (PCB) 1055 RCT Battery 1056 Battery 1057 Adhesive 1058 Lightbox Placeholders 1060 Light Guide Placeholder 1062 PCB Placeholder LED Placeholder with 1064 LEDs 1066 Content Management System (CMS) 1068 USB Gasket 1070 Proximal chassis 1071 Clutch coupling part 1072 first coupling surface of clutch coupling portion 1073 Second coupling surface of clutch coupling portion 1074 Clutch stop surface of clutch coupling part 1076 Motor 1077 Motor flange 1078 Motor Gear 1079 Screw 1080 Cassette detection pin 1081 Cassette detection pin opening on cassette contact surface 1082 Cassette detection spring 1084 Cassette detection holder 1086 Cassette locking tab in injector housing 1088 NFC antenna for detecting RFID chips on cassettes 1090 Distal end that connects to the housing 1092 bearings 1094 Intermediate chassis part 1095 Distal chassis part L Longitudinal direction LD Distal longitudinal position / Delivery position LP longitudinal proximal position LP1 Initial lock position LP2 Intermediate position / Ready to remove cap LP3 final lock position R1 First rotation position / locked rotation position R2 Second rotation position Rcr Cap release rotation position Rd delivery rotation position

Claims

1. A cassette for use in an automatic injector for administering a medication, the cassette extending in a longitudinal direction (L) from a proximal end (102) to a distal end (104), said cassette (100) comprising: a syringe holder (300) for receiving a syringe (200) containing a medicament, a syringe compartment (206) containing the drug; a syringe outlet (208) at the proximal end of said syringe compartment (206); a syringe holder (300) including a stopper (210) positioned within the syringe compartment (206), the stopper (210) being movable from a distal end of the syringe compartment toward a proximal end of the syringe compartment to empty the medication in the syringe compartment (206) through the syringe outlet (208); a skin sensor (400) longitudinally movable relative to said syringe holder (300) between a plurality of longitudinal positions, the plurality of longitudinal positions comprising at least: a longitudinal proximal position (LP) where the skin sensor covers the syringe outlet, and a skin sensor (400) comprising a longitudinal distal position (LD) in which the syringe outlet is exposed, and wherein when the skin sensor (400) is in the longitudinal distal position (LD), a drug can be delivered by an auto-injector-induced proximal movement of a stopper (210) in a syringe compartment; an index ring (500) rotatable relative to said skin sensor (400) between a plurality of rotational positions, the plurality of rotational positions including at least: a first rotational position (R1) that prevents the skin sensor (400) from moving in a distal direction, and an index ring (500) including a second rotational position (R2) in which the skin sensor (400) is movable between a longitudinal distal position and a longitudinal proximal position (LP); When the index ring (500) is in a second rotational position (R2), the skin sensor (400) is longitudinally movable relative to the index ring (500); The rotational position of the index ring (500) is configured to be controlled by one or more release members (1006) within the automatic injector (1000) when the cassette (100) is secured within the automatic injector (1000), the index ring including a track (530) extending from a first corner (532) to a second corner (534), and the index ring (500) is configured to rotate from a first rotational position (R1) to a second rotational position (R2) when the cassette (100) is inserted into the automatic injector (1000) and a release member (1006) included in the automatic injector moves proximally within the track (530).

2. 2. The cassette of claim 1, wherein when the skin sensor (400) is in a longitudinal proximal position (LP) and the index ring is in a first rotational position, the skin sensor (400) is prevented from moving distally from the longitudinal proximal position (LP) by the index ring.

3. 2. The cassette of claim 1, wherein, before use, the index ring (500) is in a first rotational position (R1) and the skin sensor (400) is locked relative to the syringe holder (300) in an initial locking position (LP1), and / or when the index ring (500) is in a second rotational position (R2), the skin sensor (400) is unlocked and can be moved proximally and / or distally relative to the syringe holder (300).

4. 10. The cassette of claim 1, wherein the indexing ring (500) includes a tubular indexing ring portion (520) that extends around the tubular skin sensor portion (420) and / or around the syringe holder (300).

5. 2. The cassette of claim 1, wherein the skin sensor (400) includes a protruding tab (408) on an outer surface of the skin sensor (400), and the index ring (500) includes a first longitudinal extension (506) having a first recess (508, 508') in which the protruding tab (408) is restrained prior to use, and / or the index ring (500) includes a locking tab (507), and the skin sensor (400) includes a first locking recess (412) in which the locking tab (507) is restrained prior to use.

6. the track (530) is located on the first longitudinal extension (506); or 2. The cassette of claim 1, wherein the indexing ring includes a first radially extending portion having a first surface area extending between a first proximal face and a first distal face, the track being positioned on the first surface area, and the first radially extending portion being part of a tubular indexing ring portion.

7. 2. The cassette of claim 1, wherein the index ring is configured to rotate to a first rotational position (R1) when a release member (1006) included in an automatic injector moves distally inside the track (530).

8. 2. The cassette of claim 1, wherein before use, the skin sensor (400) is locked in an initial locking position (LP1), and after use, the skin sensor is in a final locking position (LP3), the initial locking position (LP1) being positioned between the final locking position (LP3) and the longitudinal distal position (LD).

9. 2. The cassette of claim 1, wherein the skin sensor (400) includes a protruding tab (408) on an outer surface of the skin sensor (400), and the index ring (500) includes a first longitudinal extension (506) having a first recess (508, 508') in which the protruding tab (408) is restrained prior to use, and / or the index ring (500) includes a locking tab (507), and the skin sensor (400) includes a first locking recess (412) in which the locking tab (507) is restrained prior to use.

10. 10. The cassette of claim 9, wherein the protruding tab (408) abuts against a first proximal surface (524) when the skin sensor (400) is in a longitudinal distal position (LD), thereby preventing distal movement of the skin sensor (400) relative to the syringe holder (300), or the skin sensor (400) includes a second distal surface (424) that abuts against a second proximal surface (514) of a second radial extension (512) when the skin sensor (400) is in a longitudinal distal position (LD), thereby preventing distal movement of the skin sensor (400) relative to the syringe holder (300).

11. the indexing ring (500) further includes a second radial extension (512) having a second proximal surface (514) and a second distal surface (516, 516'); 10. The cassette of claim 9, wherein the protruding tab (408) abuts against the second proximal surface (514) when the skin sensor is in the final locking position (LP3) and the index ring (500) is in the first rotational position (R1), thereby preventing distal movement of the skin sensor relative to the syringe holder, or the distal surface (416) abuts against the second proximal surface (514) when the skin sensor is in the final locking position (LP3) and the index ring (500) is in the first rotational position (R1), thereby preventing distal movement of the skin sensor relative to the syringe holder.

12. 9. The cassette of claim 8, wherein the index ring (500) is configured to be rotated to a cap release rotation position (Rcr) located between a first rotation position (R1) and a delivery rotation position (Rd), and in the cap release rotation position (Rcr), the skin sensor is movable between a longitudinal distal position (LD) and an intermediate position (LP2), and the intermediate position (LP2) is positioned between a final lock position (LP3) and an initial lock position (LP1).

13. 13. The cassette of claim 12, wherein when the index ring is in the cap release rotation position (Rcr), the skin sensor (400) is prevented from moving from the intermediate position (LP2) to the final lock position (LP3).

14. 13. The cassette of claim 12, wherein when the index ring is in the cap release rotation position (Rcr) and the skin sensor (400) is in the intermediate position (LP2), the protruding tab (408) abuts against a second distal surface (516, 516') on the index ring, or the locking tab (507) on the index ring (500) abuts against a second locking tab (415) on the skin sensor (400).

15. The skin sensor (400) has an index ring, - The cap is in the release rotation position (Rcr), or Between the cap release rotation position (Rcr) and the delivery rotation position (Rd), or 13. The cassette of claim 12, wherein the cassette is configured to be moved to a longitudinal distal position (LD) when in a delivery rotation position (Rd) by a user pressing the skin sensor (400) against an injection site.

Images