Latch for injection device and injection device trainer

Abstract

An injection device and an injection device trainer for training a user, each one of the injection device and the injection device trainer comprising: a body portion; and an actuator positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position, the body portion comprising a body protrusion, and the actuator comprising a latch arranged to couple with the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position.

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to injection devices for administering injections and to injection device trainers for training users to use injection devices. [Background technology]

[0002] When treating a patient, it is desirable to be able to administer an injection easily and safely. A conventional syringe for administering an injection includes a syringe barrel for holding a medication, a plunger that fits within the syringe barrel, and a needle through which the medication is expelled when the plunger is pressed into the syringe barrel. Typically, the syringe has a cap for shielding the needle when the syringe is not being used to administer an injection, and the cap can be removed to expose the needle.

[0003] A particular problem associated with conventional syringes is that a patient may accidentally prick themselves or someone else with the needle before administering the injection. Another particular problem is that it can be difficult to properly align the needle with the target site, thus potentially administering the injection in the wrong place. Thus, conventional syringes can be complicated and potentially unsafe to use, especially for patients with limited dexterity.

[0004] Injection devices exist that are designed to overcome these problems with conventional syringes. One such device includes a needle shield and plunger that can be activated to force medication through the needle and into the patient's body. When the needle shield is pressed against the target site, it retracts to expose the needle, and the plunger is simultaneously pressed down to administer the injection. This allows the injection to be administered in a single motion by depressing the device's plunger over the target site. This allows patients to safely and simply administer the injection themselves. Often, these devices are designed for single use, for example, by locking the needle shield into a position that covers the needle once the injection is completed. This prevents patients from using the needle more than once, which has hygiene and health benefits.

[0005] A problem with known injection devices is that it can be difficult to train patients on the use of these devices without actually administering an injection. Therefore, adequate training may be limited to the number of injections required. Alternatively, inactive ingredients may be used as the injection material during training. However, for health and hygiene reasons, unnecessary injections should be avoided. Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above, there is a need for a device that can be used to simply and safely train patients in using an infusion device. Additionally, it is desirable to use such a device multiple times so that multiple training sessions can be conducted using the same device. There is also a need for an infusion device that is simple in construction and operates reliably. [Means for solving the problem]

[0007] In one aspect of the present invention, there is an injection device trainer for training a user to use an injection device, the injection device trainer comprising: a body portion; an actuator positioned toward a proximal end of the body portion, the actuator movable from a proximal position to a distal position; a shield positioned toward the distal end of the body portion, the shield movable between an initial position, a retracted position more proximal to the body portion than the initial position, and an extended position more distal to the body portion than the initial position; and a locking member rotatable between a first orientation in which the locking member resists movement of the actuator from the proximal position to the distal position and a second orientation in which the locking member allows movement of the actuator from the proximal position to the distal position. The first orientation of the locking member is configured to hold the shield in the initial position to prevent movement of the shield from the initial position to the extended position and to allow movement of the shield from the initial position to the retracted position. The shield is configured to contact the locking member when moving from the initial position to the retracted position to move the locking member from the first orientation to the second orientation. Moving the actuator a first distance toward the distal position unlocks the shield from the locking member such that the shield can be moved toward the extended position.

[0008] Thus, the injection device trainer accurately simulates the use of an injection device, thereby improving the training process. Additionally, the user can practice administering an injection more times compared to situations where training is only possible when an actual injection is required. The locking member provides a mechanism for simulating the use of an injection device.

[0009] In another aspect of the present invention, there is an injection device comprising: a needle coupled to a chamber for storing a fluid; a body; an actuator positioned toward a proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense the fluid stored in the chamber from the needle; a shield positioned toward the distal end of the body, the shield being movable between an initial position where the shield covers the needle, a retracted position where the shield exposes the needle and is more proximal to the body than the initial position, and an extended position where the shield covers the needle and is more distal to the body than the initial position; and a locking member rotatable between a first orientation in which the locking member resists movement of the actuator from the proximal position to the distal position and a second orientation in which the locking member allows movement of the actuator from the proximal position to the distal position. The first orientation of the locking member is configured to hold the shield in the initial position to prevent movement of the shield from the initial position to the extended position and allows movement of the shield from the initial position to the retracted position. The shield is configured to contact the locking member when moving from the initial position to the retracted position to move the locking member from the first orientation to the second orientation, and movement of the actuator a first distance toward the distal position unlocks the shield from the locking member to allow the shield to move toward the extended position.

[0010] This provides an injection device design that aids reliability and ease of manufacture.

[0011] In another aspect of the invention, there is a method for training a user to use an injection device, the method comprising providing an injection device trainer device comprising: a body portion; an actuator positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position; a shield positioned toward the distal end of the body portion, the shield being movable between an initial position, a retracted position more proximal to the body portion than the initial position, and an extended position more distal to the body portion than the initial position; and a locking member rotatable between a first orientation in which the locking member resists movement of the actuator from the proximal position to the distal position and a second orientation in which the locking member allows movement of the actuator from the proximal position to the distal position. The first orientation of the locking member is configured to hold the shield in the initial position to prevent movement of the shield from the initial position to the extended position and allows movement of the shield from the initial position to the retracted position. The method further includes moving the shield from an initial position to a retracted position such that the shield contacts the locking member to move the locking member from a first orientation to a second orientation, and moving the actuator a first distance toward a distal position to unlock the shield from the locking member such that the shield moves toward the extended position.

[0012] In another aspect of the invention, there is a method of processing an injection comprising providing an injection device comprising: a needle coupled to a chamber for storing a fluid; a body; an actuator positioned toward a proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense the fluid stored in the chamber from the needle; a shield positioned toward the distal end of the body, the shield being movable between an initial position where the shield covers the needle, a retracted position where the shield exposes the needle and is more proximal to the body than the initial position, and an extended position where the shield covers the needle and is more distal to the body than the initial position; and a locking member rotatable between a first orientation in which the locking member resists movement of the actuator from the proximal position to the distal position and a second orientation in which the locking member allows movement of the actuator from the proximal position to the distal position. The first orientation of the locking member is configured to hold the shield in the initial position to prevent movement of the shield from the initial position to the extended position and to allow movement of the shield from the initial position to the retracted position. The method further includes moving the shield from the initial position to the retracted position such that the shield contacts the locking member to move the locking member from the first orientation to a second orientation, and moving the actuator a first distance toward a distal position to unlock the shield from the locking member such that the shield moves toward the extended position.

[0013] In another aspect of the present invention, there is an injection device trainer for training a user to use an injection device, the injection device trainer comprising: a body portion; and an actuator positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position, the body portion comprising a body protrusion, the actuator comprising a latch arranged to couple with the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position.

[0014] In this way, engagement of the latch with the body projection indicates that the actuator has reached the distal position, which simulates the completion of an injection being administered by the injection device, and thus a user can be trained to determine that an injection has been properly administered.

[0015] In another aspect of the invention, there is an injection device comprising: a needle coupled to a chamber for storing a fluid; a body; and an actuator positioned toward a proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense the fluid stored in the chamber from the needle. The body comprises a body protrusion, and the actuator comprises a latch arranged to couple with the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position.

[0016] In this way, engagement of the latch with the body projection indicates that the actuator has reached the distal position, which indicates the completion of the injection being administered by the injection device, thereby allowing the user to more accurately determine that the injection has been properly administered.

[0017] In another aspect of the present invention, there is provided an injection device trainer for training a user to use an injection device, the injection device trainer comprising: a body portion; and an actuator positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position, the body portion comprising a body protrusion, the actuator comprising a latch arranged to contact the body protrusion and emit an audible sound when the actuator is in the distal position.

[0018] In this way, the audible sound indicates that the actuator has reached the distal position, simulating the completion of an injection being administered by the injection device. Thus, a user can be trained to determine when an injection has been properly administered. The audible sound may have an intensity that allows a user to hear the sound from 1 m away from the device, or at least an arm's length away from the device. The latch may be configured to emit an audible sound above a predetermined threshold intensity at a specific distance (e.g., 30 cm) from the device. For example, the predetermined threshold intensity may be 40 dB so that the intensity of the emitted sound exceeds the intensity of normal sound in a quiet room, thereby allowing a user to hear the sound in a typical working environment. The predetermined threshold intensity may be 50 dB, 60 dB, or even 70 dB to ensure that a user can hear the sound in a variety of different environments. The sound may be in the form of a short "click" sound (e.g., less than a second in length). The sound is emitted due to the mechanical interaction between the latch and the body protrusion and is not emitted by an electronic device.

[0019] In another aspect of the present invention, there is provided an injection device comprising: a needle coupled to a chamber for storing a fluid; a body; and an actuator positioned toward a proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense the fluid stored in the chamber from the needle. The body comprises a body protrusion, and the actuator comprises a latch arranged to contact the body protrusion and emit an audible sound when the actuator is in the distal position.

[0020] In this way, an audible sound indicates that the actuator has reached the distal position, which indicates the completion of the injection being administered by the injection device, and thus allows the user to more accurately determine that the injection has been properly administered.

[0021] In another aspect of the invention, there is a method for training a user to use an injection device, the method including providing an injection device trainer including a body portion and an actuator positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position. The body portion includes a body protrusion, and the actuator includes a latch. The method further includes moving the actuator from the proximal position to the distal position such that the latch couples with the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position.

[0022] In another aspect of the invention, there is a method of processing an injection, the method including providing an injection device including: a needle coupled to a chamber for storing a fluid; a body; and an actuator positioned toward a proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense the fluid stored in the chamber from the needle. The body includes a body protrusion, and the actuator includes a latch. The method further includes moving the actuator from the proximal position to the distal position such that the latch couples with the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position.

[0023] In another aspect of the invention, there is a method for training a user to use an injection device, the method including providing an injection device trainer including a body portion and an actuator positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position. The body portion includes a body protrusion, and the actuator includes a latch. The method further includes moving the actuator from the proximal position to the distal position such that the latch contacts the body protrusion when the actuator is in the distal position and emits an audible sound.

[0024] In another aspect of the invention, there is a method of processing an injection, the method including providing an injection device comprising: a needle coupled to a chamber for storing a fluid; a body; and an actuator positioned toward a proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense the fluid stored in the chamber from the needle. The body comprises a body protrusion, and the actuator comprises a latch. The method further includes moving the actuator from the proximal position to the distal position such that the latch contacts the body protrusion when the actuator is in the distal position and emits an audible sound.

[0025] In another aspect of the present invention, there is an injection device training device for training a user to use an injection device, the injection device training device comprising: a main body portion; an actuator positioned toward a proximal end of the main body portion, the actuator being movable from a proximal position to a distal position; a shield positioned toward the distal end of the main body portion, the shield being movable between an initial position and an extended position that is more distal to the main body portion than the initial position; and a connector connecting the actuator to the shield such that movement of the actuator from the distal position toward the proximal position pulls the shield from the extended position to the initial position.

[0026] In this way, the injection device trainer can be reset back to its initial position so that it can be used again. The connector provides a mechanism to accomplish this function.

[0027] In another aspect of the present invention, there is an injection device comprising: a needle coupled to a chamber for storing a fluid; a body; an actuator positioned toward a proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense the fluid stored in the chamber from the needle; a shield positioned toward the distal end of the body, the shield being movable between an initial position where the shield covers the needle, a retracted position where the shield exposes the needle and is more proximal to the body than the initial position, and an extended position where the shield covers the needle and is more distal to the body than the initial position; and a connector connecting the actuator to the shield such that movement of the actuator from the distal position to the proximal position pulls the shield from the extended position to the initial position.

[0028] In this way, the injection device can be reset back to an initial position so that the trainer can be used more than once. The connector provides a mechanism to accomplish this function.

[0029] In another aspect of the invention, there is a method for training a user to use an injection device, the method comprising providing an injection device trainer device comprising: a body portion; an actuator positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position; a shield positioned toward the distal end of the body portion, the shield being movable between an initial position and an extended position that is more distal to the body portion than the initial position; and a connector connecting the actuator to the shield, The method further includes moving the actuator from the distal position toward the proximal position to pull the shield from the extended position to the initial position using the connector.

[0030] In another aspect of the invention, there is a method of processing an injection, the method including providing an injection device comprising: a needle coupled to a chamber for storing a fluid; a body; an actuator positioned toward a proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense the fluid stored in the chamber from the needle; a shield positioned toward the distal end of the body, the shield being movable between an initial position where the shield covers the needle, a retracted position where the shield exposes the needle and is more proximal to the body than the initial position, and an extended position where the shield covers the needle and is more distal to the body than the initial position; and a connector connecting the actuator to the shield. The method further includes moving the actuator from the distal position toward the proximal position to pull the shield from the extended position using the connector.

[0031] In another aspect of the present invention, there is an injection device training device for training a user to use an injection device, the injection device training device comprising: a main body portion; an actuator assembly positioned toward a proximal end of the main body portion, the actuator assembly being movable from a proximal position to a distal position, the actuator assembly being coupled to a rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; and a damping element coupled or coupleable to the rotor for damping rotation of the rotor.

[0032] In this way, the injection device trainer is able to simulate the resistance offered by the medication in the injection device when the actuator is depressed.

[0033] In another aspect of the present invention, there is an injection device comprising: a needle coupled to a chamber for storing a fluid; a main body; an actuator assembly positioned toward a proximal end of the main body, the actuator being movable from a proximal position to a distal position to dispense the fluid stored in the chamber from the needle, the actuator assembly being coupled to a rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; and a damping element coupled or connectable to the rotor to dampen rotation of the rotor.

[0034] In this way, the injection device is able to damp the progression of the actuator towards a distal position, thereby ensuring that fluid is not rapidly dispensed from the needle.

[0035] In another aspect of the invention, there is a method for training a user to use an injection device, the method comprising providing an injection device trainer device comprising: a body portion; an actuator assembly positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position, the actuator assembly being coupled to a rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; and a damping element coupled or coupleable to the rotor for damping rotation of the rotor. The method further comprises moving the actuator from the proximal position to the distal position while the damping element damps rotation of the rotor, thereby damping movement of the actuator toward the distal position.

[0036] In another aspect of the invention, there is a method of administering an injection, the method comprising providing an injection device comprising: a needle coupled to a chamber for storing a fluid; a body; an actuator assembly positioned toward a proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense the fluid stored in the chamber from the needle, the actuator assembly being coupled to a rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; and a damping element coupled or connectable to the rotor to dampen rotation of the rotor. The method further comprises moving the actuator from the proximal position to the distal position while the damping element damps rotation of the rotor, thereby damping movement of the actuator toward the distal position.

[0037] The locking member may include an actuator resistance surface arranged to resist movement of the actuator from the proximal position to the distal position when the locking member is in the first orientation. The actuator resistance surface may include a protrusion extending from the locking member. The actuator may include an abutment surface arranged to abut the actuator resistance surface when the actuator is in the proximal position and the locking member is in the first orientation. The abutment surface may include a protrusion extending from the actuator. The locking member may include at least two (or a pair of) actuator resistance surfaces. The pair of actuator resistance surfaces may be located on opposite sides of the locking member. The actuator may include at least two (or a pair of) abutment surfaces. The pair of abutment surfaces may be located on opposite sides of the actuator. This simple and reliable mechanism allows the force exerted by the actuator on the locking member to be spread across the diameter of the locking member.

[0038] The locking member may include a cylindrical housing, and the actuator resistance surface may include a protrusion that protrudes from a surface of the cylindrical housing. The protrusion may extend around only a portion of the circumference of the cylindrical housing. The locking member may include a sloped surface. The shield may include a sloped contact surface. The sloped contact surface of the shield may be positioned to interact with the sloped surface of the locking member when moving from the initial position to the retracted position to rotate the locking member from the first orientation to the second orientation. This provides a simple and reliable mechanism for rotating the locking member to the second orientation.

[0039] The locking member may have a third orientation that allows the shield to move from the initial position to the extended position. The actuator may be configured to move a first distance to move the locking member to the third orientation. In this manner, the shield is prevented from moving to the extended position until the actuator is at least partially depressed. The extended position simulates a locked-out state of the injection device and indicates that the injection is complete. Thus, the training device cannot simulate the completion of the injection procedure until the actuator is actuated by the user.

[0040] The locking member may include a stop arranged to rest within a recess in the shield to hold the shield in the initial position, thereby providing a simple and reliable mechanism for maintaining the shield in the initial position.

[0041] The stop may be arranged to move along a slot in the shield to allow the shield to move to the extended position. The stop may be arranged to hold the shield in the initial position by being located outside the slot in the recess when the locking member is in the first orientation. In this manner, the stop can be used to allow the shield to move from the initial position to the extended position by moving the stop from the recess into the slot.

[0042] In one embodiment, the actuator moves the locking member from the second orientation to the third orientation, causing the stop to be pushed into the slot, thereby allowing the shield to move from the initial position to the extended position, and thus depressing the actuator allows the shield to move to the extended position.

[0043] The stops may be coupled to a resilient member configured to flex to move the stops inwardly toward the longitudinal axis of the training device from a resting state to a flexed state. The resting state of the stops holds the shield in the initial position. The flexed state of the stops allows the stops to move into the slots. This provides a reliable mechanism for allowing the shield to move from the initial position to the extended position.

[0044] The training device may include a biasing element that biases the shield to move distally, so that the shield can automatically move from the retracted position to either the initial position or the extended position depending on the orientation of the locking member.

[0045] The actuator resistance surface of the locking member may include a biasing portion. The actuator may be arranged to cooperate with the biasing portion to move the locking member from the second orientation to the third orientation. Thus, the actuator depresses the biasing portion to move the locking member to an orientation that allows the shield to move to the extended position.

[0046] The training device may include a biasing element arranged to bias the locking member in a first rotational direction. The biasing element may include a torsion spring. The biasing element may bias the locking member to rotate toward the first orientation away from the second orientation or the third orientation. Thus, the training device may be automatically reset.

[0047] The biasing element can bias the locking member toward the fourth orientation such that the locking member moves in the fourth orientation when the actuator moves a distance toward the distal position and the shield is in the extended position. The locking member in the fourth orientation can prevent the shield from moving from the extended position to the initial position. Thus, when the actuator is depressed, the shield can be automatically positioned in the locked out state.

[0048] The actuator may be configured to interface with the locking member when moved from the distal position to the proximal position to move the locking member toward the first direction, thereby allowing the shield to move from the extended position to the initial position, thereby allowing a user to reset the training device by moving the actuator from the distal position back to the proximal position.

[0049] The locking member may include a shield resistance surface arranged to resist proximal movement of the shield when the locking member is in the fourth orientation and the shield is in the extended position. The shield may include an abutment surface arranged to abut the shield resistance surface when the locking member is in the fourth orientation and the shield is in the extended position. This helps maintain the shield in the locked out state.

[0050] In one embodiment, the proximal position of the actuator simulates the inactivated position of the plunger of the injection device. In one embodiment, the distal position of the actuator simulates the activated position of the plunger of the injection device. In one embodiment, the initial position of the shield simulates covering the needle of the injection device. In one embodiment, the retracted position of the shield simulates exposing the needle of the injection device. In one embodiment, the extended position of the shield simulates a locked-out state of the injection device in which the shield prevents the needle from being exposed. Thus, the trainer can accurately simulate operation of the injection device.

[0051] The latch may be configured to indicate that the actuator is in the distal position by emitting an audible sound when the latch engages with the body projection. The audible sound indicates that the actuator has reached the distal position, which simulates the completion of an injection being processed by the injection device, thereby allowing a user to more accurately determine that an injection has been properly processed when using the injection device.

[0052] The latch may be configured to hold the actuator in the distal position when the latch is coupled with the body projection, which indicates that the actuator has reached the distal position, which simulates the completion of an injection being processed by the injection device, thereby allowing a user to more accurately determine that an injection has been properly processed when using the injection device.

[0053] The latch may include a resilient member and may be movable between a non-coupled state in which the latch is not coupled to the body protrusion and a coupled state in which the latch is coupled to the body protrusion, such that the latch can simply bend to couple with the body.

[0054] The resilient member may be configured to move from the coupled state to the uncoupled state when a force above a threshold is applied to the actuator when moving the actuator from the distal position to the proximal position. Thus, the latch can securely hold the actuator in the distal position while allowing the training device to return to its initial configuration when a user intentionally applies a force above the threshold to the actuator.

[0055] The latch may include a latch bias portion arranged to cooperate with the body protrusion to move the latch from the uncoupled state to the coupled state. The latch may include a gripping element to grip the body portion in the coupled state. In this manner, the bias portion assists in moving the latch into coupling with the body and the gripping element assists in maintaining the latch and body connected to one another.

[0056] The resilient member may comprise a biasing portion and / or a gripping element, and the biasing portion and the gripping element may be provided on opposite sides of the latch, thereby providing a reliable latch structure.

[0057] The connector can resist distal movement of the shield away from the initial position when the actuator is in the proximal position. In this way, the connector helps maintain the shield in the initial position.

[0058] The connector may allow the shield to move toward the retracted position when the actuator is in the proximal position. In this way, the connector does not impede retraction of the shield to the retracted position.

[0059] The connector can allow the shield to move distally toward the extended position when the actuator moves toward the distal position, and thus the connector can act to release the shield.

[0060] The connector may have an actuator interface that abuts a portion of the actuator to resist distal movement of the shield away from the initial position when the actuator is in the proximal position, the abutment of the actuator interface with the actuator providing a mechanism for retaining the shield in the initial position.

[0061] The actuator interface may abut a surface of the actuator facing proximally, such that the connector may be moved by the actuator when the actuator moves proximally, but the actuator does not move the connector when it moves distally.

[0062] The connector may have a shield interface that abuts a portion of the shield to resist distal movement of the shield away from the initial position when the actuator is in the proximal position, thereby providing a mechanism for retaining the shield in the initial position.

[0063] The shield interface may abut a distally facing surface of the shield, such that the connector can move the shield when the actuator moves proximally, but the connector does not move the shield when the actuator moves distally.

[0064] In another aspect of the present invention, there is a kit of parts configured to be assembled into an injection device trainer or injection device as described herein. [Brief explanation of the drawings]

[0065] Embodiments of the present invention will now be described, by way of example only, with reference to the following drawings, in which: [Figure 1] 1 shows an injection device trainer for training users to use an injection device. [Figure 2A] 1 shows the cap attached to the distal end of the injection device trainer. [Figure 2B] 10 shows the injection device trainer with the actuator in the proximal position and the shield in the initial position. [Figure 2C] 1 shows the actuator in a proximal position and the shield in a retracted position. [Figure 2D] 1 shows the actuator moving distally from a proximal position and the shield in a retracted position. [Figure 2E] 1 shows the actuator in a distal position and the shield in a retracted position. [Figure 3A] 1 shows the actuator in a distal position and the shield in an extended position. [Figure 3B] 10 shows the actuator as it moves proximally towards a distal position and the shield in an extended position. [Figure 3C] 1 shows the actuator in a distal position and the shield in an initial position. [Figure 4] FIG. 1 is an exploded view of an injection device trainer. [Figure 5A]FIG. 16 is a side view of the internal components of the injection device trainer with the actuator in the proximal position and the shield in the initial position. [Figure 5B] FIG. 16 is a perspective view of the internal components of the injection device trainer with the actuator in the proximal position and the shield in the initial position. [Figure 6] FIG. 4 is an exploded view of the inner shield portion and the locking member. [Figure 7A] FIG. 10 is a side view of the internal components of the injection device trainer with the actuator in the proximal position and the shield in the retracted position. [Figure 7B] FIG. 16 is a perspective view of the internal components of the injection device trainer with the actuator in the proximal position and the shield in the retracted position. [Figure 8] FIG. 16 is a perspective view of the internal components of the injection device trainer with the actuator in the distal position and the shield in the extended position. [Figure 9] FIG. 1 is an exploded view of an injection device trainer with a connector. [Figure 10] FIG. 1 is an exploded view of an injection device trainer having a latch. [Figure 11A] FIG. 12 is a side view of the internal components and damping element of the injection device trainer. [Figure 11B] FIG. 1 is a perspective view of the internal components and damping element of an injection device trainer. [Figure 12A] FIG. [Figure 12B] FIG. 1 is a top view of the rotor, where the angled teeth can be seen. [Figure 12C] FIG. [Figure 13A] FIG. [Figure 13B] FIG. 2 is a cutaway view taken along section AA. [Figure 14A] FIG. 2 is a second side view of the rotor. [Figure 14B] FIG. 1 is a cutaway view taken along cross section BB. [Figure 15] FIG. 10 is a side view of the rotor and damping element when fully engaged. DETAILED DESCRIPTION OF THE INVENTION

[0066] 1, there is shown an injection device trainer 1 for training a user to use an injection device. The trainer 1 comprises a body portion 3 having a proximal end 5 and a distal end 7.

[0067] In use, the distal end 7 of the body 3 is positioned toward the surface of the user's body, which may be the target site where the user normally administers an injection. In use, the proximal end 5 of the body 3 is positioned toward the user's hand, which is used to actuate the training device 1. The body 3 also has windows 12 on either side of the body 3 that simulate the windows in an injection device used to view the medication contained within the device.

[0068] Although the terms "proximal" and "distal" are used herein to describe the device, these terms are used to provide context and do not require that the training device 1 be used in any particular orientation. The terms "first end" and "second end" may be used in place of the terms "distal end" and "proximal end" without changing the intended meaning.

[0069] The injection device trainer 1 also includes an actuator 9 and a shield 11. The actuator 9 simulates the plunger in the injection device used to dispense medication from the needle, and the shield 11 simulates the needle shield in the injection device used to cover and expose the needle.

[0070] The training device 1 has a removable cap 13 that can be positioned over the shield 11 to prevent accidental retraction of the shield 11. The cap 13 has a pair of indentations 15 on its inner surface. These indentations 15 are positioned to rest over a pair of ridges 17 on the outer surface of the distal end 7 of the body portion 3, thereby holding the cap 13 in place. The distal end 7 of the body portion 3 also has a pair of nodes 19 opposite each indentation 15 that abut the surface of the shield 11, thereby preventing the shield 11 from advancing further toward the proximal end 5 when the indentations 15 engage the ridges 17.

[0071] The features of the injection device trainer 1 described herein may be identical or substantially identical to the injection device for training users. However, the injection device trainer 1 does not include a needle to prevent users from injecting during the training procedure. The injection device trainer 1 also does not include any fluid, such as a medication, contained therein, although the trainer 1 may include a container that simulates the container for containing the medication of the injection device.

[0072] 2A-2E, there is a sequence for training a user in administering an injection using an injection device trainer 1. As can be seen, FIG. 2A depicts the trainer 1 described with reference to FIG. 1. FIG. 2B shows the trainer 1 with the cap 13 removed, exposing the shield 11. As shown in FIG. 2B, the shield 11 is in an initial position, which simulates the position of the needle shield of an injection device when the needle is covered.

[0073] Referring to FIG. 2C , a user can grasp training device 1 by actuator 9 and position shield 11 over a target site. The user can then push actuator 9 toward distal end 7 of body portion 3. This action moves shield 11 toward proximal end 5 to its retracted position. When shield 11 is in its initial position, actuator 9 is prevented from moving toward distal end 7 relative to body portion 3. Thus, actuator 9 is held in a proximal position and cannot advance forward. However, once shield 11 is in the retracted position, actuator 9 is permitted to move distally along the longitudinal axis of training device 1.

[0074] 2C shows the shield 11 in a retracted position, which is more proximal to the body portion 3 than the initial position. When in the retracted position, the shield 11 is partially retracted inside the body portion 3. This position simulates the position of the needle shield of an injection device when the needle is exposed to administer an injection.

[0075] 2D and 2E, once the shield 11 is in the retracted position, the actuator 9 is allowed to move distally. Figure 2D shows the actuator 9 advancing towards the distal end 7. Figure 2E shows the actuator 9 in the distal position, which simulates the position of a plunger in an injection device after an injection has been administered.

[0076] 3A-3C, there is a sequence for resetting the injection device trainer 1 after the injection simulation is complete. Referring to FIG. 3A, the user can remove the trainer 1 from the target site, which allows the shield 11 to move distally to an extended position that is more distal to the body portion 3 than the initial and retracted positions. The extended position of the shield 11 simulates a locked-out state of the injection device, in which the needle shield of the injection device prevents the needle from being exposed.

[0077] 3B-3C, the user can pull the actuator 9 toward the proximal end 5 to reset the training device 1, thereby repeating the sequence described with reference to FIGS. 2A-2E. FIG. 3B shows the actuator 9 advancing toward the proximal position, and FIG. 3C shows the actuator 9 after it has reached the proximal position. Once the actuator 9 is pulled to the proximal position, the shield 11 returns to its initial position so that the training device 1 can be used for another training session.

[0078] 4 shows an exploded view of injection device trainer 1. Body portion 3 comprises base portion 21 that connects to main portion 23, which is surrounded by first outer portion 25 and second outer portion 27. In this embodiment, the components of body portion 3 fit together to form a body assembly. However, body portion 3 may also be formed from a single piece.

[0079] The shield 11 of the training device 1 includes an outer shield portion 29 and an inner shield portion 31. The outer shield portion 29 extends from the base portion 21, and the inner shield portion 31 is located within the body portion 3. There is also a spring 33 that acts as a biasing element to urge the shield 11 distally.

[0080] The actuator 9 of the training device 1 includes an actuator body 35 and an end cap 37. These components form the exterior surfaces with which a user can interact to move the actuator 9. Located within the actuator body 35 and end cap 37 is an inner part 39 of the actuator 9. The inner part 39 connects to a threaded plunger 41 at its proximal end, while the distal end of the plunger 41 connects to a tip 43 that maintains the plunger 41 in alignment with the longitudinal axis of the training device 1. In this example, the components of the actuator 9 are fitted together to form the actuator assembly. However, the actuator 9 may also be formed from a single piece.

[0081] The plunger 41 is coupled to a damping element 45 which is used to damp rotation of the plunger 41 and thus damp movement of the actuator 9 towards its distal position.

[0082] Training device 1 further comprises a locking member 47 including a first locking portion 51 and a second locking portion 53. In this embodiment, first locking portion 51 and second locking portion 53 are separate components that connect together to form locking member 47. However, in another embodiment, locking member 47 is formed from a single piece.

[0083] The locking member 47 is rotatable about the longitudinal axis of the training device 1 such that the locking member 47 can be positioned in different rotational orientations. The locking member 47 can rotate but cannot move proximally or distally relative to the main body 3. The locking member 47 has a first orientation in which the locking member 47 resists movement of the actuator 9 from a proximal position (as shown in FIGS. 2A-2B) to a distal position (as shown in FIG. 2E). Thus, the first orientation of the locking member 47 is configured to hold the actuator 9 in the configuration described with reference to FIGS. 2A-2B. The first orientation of the locking member 47 is also configured to hold the shield 11 in an initial position (as shown in FIG. 2B) to prevent movement of the shield 11 from the initial position to the extended position (as shown in FIGS. 3A-3B) and to allow movement of the shield 11 from the initial position to the retracted position (as shown in FIG. 2C).

[0084] The locking member 47 also has a second orientation that allows the locking member 47 to move the actuator 9 from a proximal position to a distal position. Thus, the second orientation of the locking member 47 is configured to allow the actuator 9 to move to the position shown in FIG. 2E.

[0085] The training device 1 also includes a biasing element 55, which in this embodiment is a torsion spring. The biasing element 55 biases the locking member 47 in a first rotational direction 57. The first rotational direction 57 may be clockwise or counterclockwise depending on the orientation of the training device 1.

[0086] The training device 1 further comprises an inner housing 59 that simulates the syringe of the injection device, and a grip 61 that holds the inner housing in place.

[0087] 5A-5B show training device 1 in the same configuration as described with reference to FIGS. 2A-2B, with actuator 9 in a proximal position and shield 11 in an initial position. In this configuration, locking member 47 is in a first orientation that prevents actuator 9 from moving distally.

[0088] 5A-5B and 6, the locking member 47 includes an actuator resistance surface 63 having a protrusion that protrudes from a portion of the outer surface of the cylindrical housing of the locking member 47. The actuator resistance surface 63 protrudes from the locking member 47 in a direction away from the longitudinal axis of the training device 1. The actuator 9 includes an abutment surface 65 having a protrusion that protrudes from a portion of the inner surface of the actuator 9. The abutment surface 65 protrudes from the actuator 9 in a direction toward the longitudinal axis of the training device 1. The abutment surface 65 is positioned to abut against the actuator resistance surface 63. Thus, the actuator resistance surface 63 is configured to resist movement of the actuator 9 from the proximal position to the distal position when the locking member 47 is in the first orientation.

[0089] In the training device 1, there are two actuator resistance surfaces 63, which in this embodiment are located on opposite sides of the locking member 47. This allows the force pressing down on the actuator 9 to be spread across the locking member 47. There are also two corresponding abutment surfaces 65, which in this embodiment are located on opposite sides of the actuator 9.

[0090] The locking member 47 includes a stop 67 that is positioned to locate within a recess 69 in the inner shield portion 31 of the shield 11. The stop 67 prevents the shield 11 from moving distally from the initial position to the extended position, but allows the shield 11 to move proximally toward the retracted position. In this embodiment, the locking member 47 includes a pair of stops 67 positioned on opposite sides of the locking member 47. The inner shield portion 31 has a pair of corresponding recesses 69 on opposite sides of the inner shield portion 31. The recesses 69 define an opening having similar or identical dimensions to the window 12 described with reference to FIG. 1 .

[0091] 7A-7B show training device 1 in the same configuration as described with reference to FIG. 2C, with actuator 9 in a proximal position and shield 11 in a retracted position. In this configuration, locking member 47 has been rotated to a second orientation that allows actuator 9 to move distally, as described in more detail below.

[0092] 5A and 6, locking member 47 includes a ramp 71, which in this example is an angled surface extending from the outer surface of second locking portion 53. Inner shield portion 31 includes a ramp contact surface 73, which in this example is an angled surface within a recess in inner shield portion 31. Ramped surface 71 and ramp contact surface 73 are shaped and positioned such that ramp contact surface 73 rotates locking member 47 when shield 11 moves from the initial position to the retracted position. In this example, ramp surface 71 and ramp contact surface 73 rotate locking member 47 in a second rotational direction 75 that is opposite to first rotational direction 57 in which locking member 47 is biased.

[0093] Preferably, locking member 47 includes a pair of angled surfaces 71, and shield 11 includes two angled contact surfaces 73. Each angled surface 71 may be on an opposite side of locking member 47 from the other. Each angled contact surface 73 may be on an opposite side of shield 11 from the other. This helps reduce frictional forces on locking member 47 and shield 11.

[0094] When the shield 11 moves to the retracted position, the locking member 47 rotates to a second orientation. This is shown in FIGS. 7A-7B. Here, it can be seen that the protrusion formed by the inclined surface 71 fits into the recess formed by the inclined contact surface 73 to hold the shield 11 in the retracted position. When the locking member 47 is in the second orientation, the gap 77 formed at the end of the actuator resistance surface 63 is at least partially rotatably aligned with the abutment surface 65 so that the abutment surface 65 can pass through the gap 77. Thus, the abutment surface 65 can move past the actuator resistance surface 63, and the actuator 9 can begin to move from the proximal position toward the distal position. The width of the abutment surface 65 is equal to or less than the width of the gap 65. In an embodiment in which there are two abutment surfaces 65 and two actuator resistance surfaces 63, the same process described above occurs on the opposite side of the training device 1.

[0095] Referring to FIG. 6 , the actuator resistance surface 63 of the locking member 47 includes a deflectable portion 79 configured to engage the actuator's abutment surface 65 as the actuator moves distally. As the abutment surface 65 engages the deflectable portion 79, the locking member 47 moves further in the second rotational direction 75 from the second orientation to a third orientation. As the actuator 9 moves a first distance distally, the abutment surface 65 moves to locate within the gap 77 of the locking member 47. Thus, the force of the actuator 9 moves the locking member 47 to the third orientation, thereby moving the stop 67 into the slot 81 on the inner surface of the inner shield portion 31. When the abutment surface 65 is located within the gap 77, this condition holds the locking member 47 in the third orientation. The abutment surface 65 does not extend to the top of the actuator 9. Thus, when abutment surface 65 moves across gap 77 and shield 11 moves out of engagement with locking member 47, the force applied by biasing element 55 allows locking member 47 to rotate back to the first rotational direction.

[0096] A slot 81 in inner shield portion 31 forms a track within which stop 67 can slide. Slot 81 has an opening 83 at the proximal end of inner shield portion 31. Slot 81 allows shield 11 to move distally from the retracted position toward the extended position until stop 67 reaches opening 83, releasing inner shield portion 31 from contact with locking member 47.

[0097] Once stop 67 clears opening 83 of slot 81, shield 11 is permitted to move to the extended position. This allows shield 11 to move past locking member 47 to the extended position, which is distal to the position of locking member 47 and distal to the initial position. The position of shield 11 relative to locking member 47 when shield 11 is in the extended position is shown in FIG. 8, which is the configuration described with reference to FIG. 3A.

[0098] 6 , stop 67 includes a resilient member 85 configured to be deflected inward by inner shield portion 31. Thus, resilient member 85 and stop 67 can move inward toward the longitudinal axis of training device 1. Stop 67 presses against the edge of recess 69 when actuator 9 rotates locking member 47 from the second orientation to the third orientation. This forces stop 67 and resilient member 85 inward, allowing stop 67 to enter slot 81 in inner shield portion 31. As shown, stop 67 has an angled surface that assists in deflecting resilient member 85 inward.

[0099] 3A and 8, the actuator 9 no longer holds the locking member 47 in the third orientation and the ramp surface 71 can no longer contact the ramped contact surface 73. The locking member 47 is therefore free to rotate in the first rotational direction 57 and is urged in this direction by the biasing element 55.

[0100] The locking member 47 rotates beyond the first orientation to a fourth orientation in which a portion of the actuator 9 abuts the reset bias portion 87 on the locking member 47. This holds the locking member 47 in the fourth orientation, thereby preventing the shield 11 from moving proximally from the extended position toward the initial position. The shield 11 thus simulates a locked-out state of the injection device.

[0101] When the locking mechanism 47 is in the fourth orientation, the shield resistance surface 89 abuts against the surface of the proximal end of the inner shield portion 31. In this embodiment, the shield resistance surface 89 is a protrusion extending from the angled surface 71. The shield resistance surface 89 blocks the path of the shield 11 so that the shield 11 cannot move proximally from the extended position.

[0102] 3A-3C, the user can reset the training device 1 by pulling the actuator 9 from the distal position back to the proximal position. As the actuator 9 moves proximally, the abutment surface 65 engages the angled surface of the reset bias portion 87 to rotate the locking mechanism 47 from the fourth orientation to the first orientation.

[0103] When the locking member 47 is rotated a first angular distance in the second rotational direction 75 toward the first orientation, the shield resistance surface 89 is no longer directly above the proximal end of the inner shield portion 31 in the direction of the longitudinal axis of the training device 1. Instead, the shield resistance surface 89 is directly above a recess in the inner shield portion 31 in the direction of the longitudinal axis of the training device 1. Thus, the shield 11 can move from the extended position toward the initial position.

[0104] As the shield 11 moves from the extended position back toward the initial position, the angled contact surface 73 of the shield 11 exerts a force on the angled surface 71 of the locking member 47, causing the locking member 47 to move in the second rotational direction 75 toward the first orientation. As the inner shield portion 31 moves proximally, the stop 67 and the resilient member 85 flex inward such that the stop 67 passes under the proximal end of the inner shield portion 31. As the inner shield portion 31 moves further, the stop 67 moves into the recess 69, which holds the shield 11 in the initial position as described above. Additionally, when the shield 11 reaches the initial position, the locking member 47 has finished rotating in the first orientation as described above. Therefore, the training device 1 can be reset and returned to the configuration described with reference to FIG. 2B.

[0105] To reset the device, it is possible to manually move the shield 11 from the extended position toward the initial position. However, this requires the user to simultaneously move the shield 11 to the initial position and the actuator 9 to the proximal position to reset the device, which requires the use of two hands, which is undesirable. Referring to Figure 9, a reset connector 91 is provided that automatically pulls the shield 11 from the extended position toward the initial position when the actuator 9 is pulled from the distal position to the proximal position.

[0106] The reset connector 91 is a fixed length rod with an actuator interface, such as a first hook 93, at its proximal end. The first hook 93 is positioned to interface with a portion of the actuator 9, such as a ledge 95 on the inner part 39 of the actuator 9. Because the ledge 95 faces proximally, proximal movement of the actuator causes the reset connector 91 to move proximally as the ledge 95 contacts the first hook 93. However, distal movement of the actuator 9 does not cause the reset connector 91 to move distally because the actuator 9 cannot apply a force in this direction to the first hook 93.

[0107] The rest connector 91 also includes a shield interface, such as a second hook 97, at its distal end. The second hook 97 is positioned to abut a portion of the shield 11, for example, by being received by an opening 92 in the shield 11. When the reset connector 91 moves proximally by moving the actuator toward a proximal position, the proximal end 92a of the opening 92 contacts the second hook 97. This allows the reset connector 91 to pull the shield 11 toward the initial position to reset the training device 1.

[0108] Aperture 92 may be configured as an elongated opening extending distally along inner shield portion 31, as shown in FIG. 9. Second hook 97 may be positioned within the opening at all times during operation of training device 1. In these embodiments, second hook 97 trajectories along opening 92 as actuator 9 is moved distally from the proximal position shown in FIG. 2B to the distal position shown in FIG. 2E and proximally from the distal position toward the proximal position until second hook 97 contacts proximal end 92 a of the opening, as described above, allowing reset connector 91 to pull shield 11 toward the initial position to reset training device 1.

[0109] Apertures 92 may be formed in any suitable portion of shield 11. For example, apertures may be formed in outer shield portion 29 and function substantially similarly as described above. Apertures 92 may extend through the portion of the shield in which they are formed in a direction perpendicular to the longitudinal axis of training device 1. Alternatively, apertures may be etched or recessed in the surface of shield 11.

[0110] 9, the opening 92 may have a closed distal end. Alternatively, the opening may be formed as a slot in the distal end of the inner and / or outer shield portion having a closed proximal end 92a against which the second hook 97 abuts, and an open distal end.

[0111] In some embodiments, the opening may not extend distally along the shield 11 so that the second hook 97 is always positioned within the opening during operation of the training device 1. For example, the opening 92 may be configured as a generally circular opening in the shield 11. The reset rod 91 may be configured so that the second hook 97 is resiliently biased into the opening as the actuator moves toward its proximal position, allowing contact between the second hook 97 and the proximal end 92 a of the opening, thereby pulling the shield 11 toward the initial position to reset the training device 1. The distal end of the second hook 97 may be shaped to cam engage the closed distal end of the opening. When the reset rod 91 moves distally due to movement of the actuator toward the distal position, the cam engagement between the second hook 97 and the distal end of the opening overcomes the resilient bias, allowing the second hook 97 to disengage the opening 92 as the actuator moves distally.

[0112] Referring to FIG. 10 , the injection device trainer 1 includes a latch 99 configured to attach to the inner part 39 of the actuator 9. In this embodiment, the latch 99 includes a piece of elastic wire formed into a loop 101 that is arranged to rest around a circular protrusion 103 on the inner part 39. Because the latch 99 is elastic, the diameter of the loop 101 can be expanded to rest around the circular protrusion. The loop can then be released once the diameter of the loop 101 has contracted so that the latch holds the circular protrusion 103. The latch 99 also includes a first extension 105 configured to rest between a pair of holders 107 that hold the latch 99 in place.

[0113] Latch 99 further comprises a second extension 109, which in this embodiment is longer than first extension 105. Second extension 109 comprises a distally extending first portion 111 and a second portion 113 angled relative to first portion 111. Second portion 113 forms a deflection portion on its distal side and a gripping element on its proximal side. After actuator 9 has moved a certain distance from the proximal position to the distal position, second portion 113 contacts a body protrusion 115 on main section 23 of body portion 3.

[0114] As the actuator 9 moves distally, the resilient latch 99 bends outward, away from the longitudinal axis of the training device 1 and onto the body protrusion 115. Once the actuator 9 has finished moving to the distal position, the resilient latch 99 returns to its rest position. In this state, the angled surface of the latch 99, which represents the gripping element, couples the latch 99 to the body protrusion 115. This holds the actuator 9 in a distal position relative to the body 3.

[0115] When the actuator 9 is moved from the distal position to the proximal position, the body protrusion 115 exerts a force on the latch 99. When this force exceeds a threshold value, the gripping element of the second portion 113 bends in a direction perpendicular to a direction extending away from the longitudinal axis of the training device 1. Thus, the gripping element passes over the body protrusion 115, thereby allowing the actuator 9 to be released from the distal position. The threshold force required to bend the latch ensures that the actuator 9 is securely held in the distal position. However, the threshold force also allows the actuator 9 to snap back to the proximal position once the gripping element releases the body protrusion.

[0116] 11A-11B, the damping element 45, briefly described with reference to FIG. 4, will now be described in more detail.

[0117] In the training device 1, the plunger 41 of the actuator 9 has threads that couple with the rotor 117. The rotor 117 may include internal threads 118 configured to engage the threads of the plunger 41 to facilitate coupling between the plunger 41 and the rotor 117. The plunger 41 is fixed to the inner part 39 of the actuator 9 to prevent the plunger from rotating relative to the actuator 9. The rotor 117 interfaces with the threads, thus causing the plunger 41 to rotate in the second rotational direction 75 as the plunger 41 moves distally with the actuator 9. The rotor 117 is coupled to a damping element 45, which in this example is a torsion spring 119 biased toward a coiled state. As the rotor 117 rotates, it stretches the torsion spring 119, thereby damping the rotation of the rotor 117 and therefore damping the progression of the actuator 9 toward its distal position. The properties of the spring 119 may be selected according to the desired resistance, for example, if a high resistance is desired, a spring 119 with a high spring constant may be selected.

[0118] Damping element 45 also includes a ratchet 121 that includes a plurality of angled teeth that interlock with angled teeth 130 on rotor 117. When actuator 9 is moved a distance toward a distal position, the angled teeth on rotor 117 move into engagement with the angled teeth on ratchet 121. Rotor 117 and ratchet 121 form an anti-rotation mechanism that allows rotor 117 to rotate in second rotational direction 75 but resists movement of the rotor in first rotational direction 57. In this manner, tension in torsion spring 119 is maintained because rotor 117 prevents torsion spring 119 from returning to its coiled state when rotor 117 stretches spring 119.

[0119] Each of the angled teeth 130 of the rotor 117 may include an angled edge 132 (e.g., angled relative to the longitudinal axis of the exerciser) and a straight edge 131 (e.g., substantially parallel to the longitudinal axis of the exerciser). The rotor 117 may be configured such that the angled edge of each tooth faces the second rotational direction 75. In other words, the angled edge of each angled tooth leads as the rotor 117 rotates as the plunger 41 moves distally with the actuator 9. The angled teeth of the ratchet 121 closely match the angled teeth of the rotor 117. In other words, the straight edge of each tooth of ratchet 121 faces second rotational direction 75 so that the straight edges of the teeth of rotor 117 abut corresponding straight edges of the teeth of ratchet 121 to resist movement of the rotor in first rotational direction 57. Ratchet 121 may be rotatably fixed relative to actuator 9.

[0120] The damping element 45 and rotor 117 may be configured depending on the point during actuator depression at which engagement of the rotor 117 with the ratchet 121, and therefore the formation of the anti-rotation mechanism, is desired. For example, in embodiments in which a high spring constant spring 119 is used, it may be desirable for the anti-rotation mechanism to engage early during depression of the actuator 9 to assist the user in resisting the bias of the spring 119 and returning to its coiled state. Early engagement of the anti-rotation mechanism may be achieved, for example, by providing angled teeth on the ratchet 121 that have a greater height along the longitudinal axis of the training device 1.

[0121] When the actuator 9 is pulled rather than pushed, or in other words, when the actuator 9 is moved proximally, the plunger 41 disengages the angled teeth of the rotor 117 from the angled teeth of the ratchet 121. This allows the rotor to move in the first rotational direction 57 as the plunger 41 moves proximally, thereby moving the spring back to its coiled state. The separation distance, i.e., the distance the actuator 9, plunger 41, and rotor 117 are moved proximally to disengage the angled teeth of the rotor 117 from the angled teeth of the ratchet 121, is greater than the height of the ratchet's angled teeth along the longitudinal axis of the training device 1. In some embodiments, the separation distance can be about 2 mm.

[0122] Damping elements may be implemented in the training device 1 to simulate large volume and / or high viscosity treatments. Damping elements may also be utilized in injection devices to force the user to press the actuator 9 more slowly when delivering large volume treatments or low viscosity substances (which themselves offer little resistance to pressure) to reduce adverse side effects such as excessive bruising, pain, retention of the injected substance within the patient, etc., caused by injecting the substance too quickly.

[0123] In an alternative embodiment of the damping element, the torsion spring may be coupled to the ratchet. As in the previous embodiment, the rotor engages with the threads of the plunger, which then rotates the rotor in a second rotational direction as the plunger moves distally with the actuator. In this embodiment, the rotor is configured so that the straight edge of each tooth faces the second rotational direction. In other words, the straight edge of each angled tooth leads as the rotor rotates as the plunger moves distally with the actuator. The initial rotation of the rotor in this embodiment does not cause the torsion spring to stretch. Therefore, the initial progression of the actuator toward the distal position encounters little or no resistance.

[0124] An alternative damping element includes a ratchet coupled with a torsion spring biased toward a coiled state. The ratchet includes a plurality of angled teeth that interlock with angled teeth on the rotor. When the actuator is moved a distance toward the distal position, the angled teeth of the rotor move into engagement with the angled teeth of the ratchet, causing the straight edges of the rotor teeth to rotate and abut against the corresponding straight edges of the ratchet teeth. In this embodiment, as the rotor and ratchet move into engagement with each other, continued rotation of the rotor rotates the ratchet. Rotation of the ratchet stretches the torsion spring, which damps the rotation of the ratchet and rotor, and therefore further progression of the actuator toward the distal position. Again, the configuration of the damping element and rotor, e.g., spring characteristics and tooth height, may be selected depending on the desired resistance characteristics.

[0125] In some embodiments, the rotor 117 and / or damping element 45 may be replaceable parts of a trainer or injection device. For example, the device may be configured so that the torsion spring 119 can be replaced with another spring of a higher or lower spring constant. This may facilitate, for example, training a user to deliver substances of various different viscosities using a single trainer device.

[0126] An injection device in the context of the present application may be an automatic injection device (auto-injector), in which the actuator 9 is operated by or replaced by an automatic actuator such as a drive spring, a pneumatic piston operated by a compressed gas canister, or a solenoid in an electrically operated automatic injection device.

[0127] In such automatic injection devices, a damping element 45 can be used to dampen, slow down, or control the force that the actuator applies to a container containing the substance to be injected and / or to a delivery mechanism, e.g., a plunger of a drug container such as a syringe. The damping element can be useful for adjusting the rate of injection by the automatic injector without requiring modification of the automatic actuator.

[0128] The damping element may be configured to operate during any portion of the actuation sequence. For example, the damping element may be configured to dampen the actuator's progression toward the distal position for the entire duration of the progression, or for only a selected portion. In some embodiments, for example, to ensure complete delivery of the injection substance by an auto-injector, the injection device may be configured to begin damping the actuator's progression once the needle on the medication container is fully extended.

[0129] Unless otherwise stated, each embodiment described herein may be combined with any other embodiment described herein.

[0130] It will be understood that the benefits and advantages described above may relate to one embodiment or to several embodiments, and embodiments are not limited to those that solve any or all of the problems described or that have any or all of the benefits and advantages described.

[0131] A reference to "an" item refers to one or more of those items.

[0132] References herein to an "element" may additionally correspond to a "means" for that element to perform a particular function described herein.

[0133] It will be understood that the above description of preferred embodiments is given by way of example only, and that various modifications may be made by those skilled in the art. Although various embodiments have been described above with a certain degree of particularity, or with reference to one or more individual embodiments, those skilled in the art could make many changes to the disclosed embodiments without departing from the scope of the invention.

[0134] Aspects of the present disclosure that form part of the detailed description: 1. An injection device training device for training a user to use an injection device, comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion includes a body protrusion, and the actuator includes a latch arranged to retain the actuator in the distal position by interlocking with the body protrusion when the actuator is in the distal position; Injection device training equipment. 2. The injection device trainer of aspect 1, wherein the latch is configured to emit an audible sound when the latch engages with the body projection. 3. An injection device training device for training a user to use an injection device, comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion includes a body protrusion, and the actuator includes a latch arranged to contact the body protrusion and emit an audible sound when the actuator is in a distal position; Injection device training equipment. 4. The injection device trainer of embodiment 3, wherein the latch holds the actuator in a distal position when the latch is coupled with the body projection. 5. The injection device trainer of any one of aspects 1-4, wherein the latch comprises a resilient member. 6. An injection device training device according to any one of aspects 1 to 5, wherein the latch is movable between a non-connected state in which the latch is not connected to the main body protrusion and a connected state in which the latch is connected to the main body protrusion. 7. An injection device training device as described in aspects 5 and 6, wherein the elastic member is arranged to move from a coupled state to an uncoupled state when a force exceeding a threshold is applied to the actuator when moving the actuator from a distal position to a proximal position. 8. The injection device trainer of any one of aspects 1-7, wherein the latch comprises a latch biasing portion arranged to interface with the body protrusion to move the latch from the uncoupled state to the coupled state. 9. The injection device trainer of embodiment 8, wherein the latch comprises a resilient member that includes a latch biasing portion. 10. The injection device trainer of any one of aspects 1-9, wherein the latch comprises a gripping element positioned to grip the body portion in the coupled state. 11. The injection device trainer of aspect 10, wherein the latch comprises a resilient member that includes a gripping element. 12. The injection device trainer of aspects 8 and 10, wherein the latch biasing portion and the gripping element are on opposite sides of the latch. 13. the actuator is coupled to the rotor such that movement of the actuator from a proximal position to a distal position rotates the rotor; the injection device trainer further comprises a damping element coupled or coupleable to the rotor for damping rotation of the rotor; 13. An injection device training device according to any one of claims 1 to 12. 14. An injection device comprising: a needle coupled to a chamber for storing a fluid; a main body; an actuator positioned toward the proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense fluid stored in the chamber from the needle; the body portion includes a body protrusion, and the actuator includes a latch arranged to retain the actuator in the distal position by interlocking with the body protrusion when the actuator is in the distal position; Injection device. 15. An injection device comprising: a needle coupled to a chamber for storing a fluid; a main body; an actuator positioned toward the proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense fluid stored in the chamber from the needle; the body portion includes a body protrusion, and the actuator includes a latch arranged to contact the body protrusion and emit an audible sound when the actuator is in a distal position; Injection device. 16. the actuator is coupled to the rotor such that movement of the actuator from a proximal position to a distal position rotates the rotor; the injection device further comprising a damping element coupled or coupleable to the rotor for damping rotation of the rotor; 16. An injection device according to claim 14 or claim 15. 17. A kit of parts configured to be assembled into an injection device trainer according to any one of embodiments 1-13 or an injection device according to any one of embodiments 14-16. 18. A method for training a user to use an injection device, the method comprising providing an injection device trainer, the injection device trainer comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion includes a body protrusion, and the actuator includes a latch; The method comprises: further comprising moving the actuator from the proximal position to the distal position such that the latch couples with the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position. A method for training a user to use an infusion device. 19. A method of administering an injection, the method comprising providing an injection device, the injection device comprising: a needle coupled to a chamber for storing a fluid; a main body; an actuator positioned toward the proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense fluid stored in the chamber from the needle; the body portion includes a body protrusion, and the actuator includes a latch; The method comprises: further comprising moving the actuator from the proximal position to the distal position such that the latch couples with the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position. How to handle injections. 20. A method for training a user to use an injection device, the method comprising providing an injection device trainer, the injection device trainer comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion includes a body protrusion, and the actuator includes a latch; The method comprises: moving the actuator from the proximal position to the distal position such that the latch engages the body projection when the actuator is in the distal position and emitting an audible sound when the latch engages the body projection; The method further comprises: 21. A method of administering an injection, the method comprising providing an injection device, the injection device comprising: a needle coupled to a chamber for storing a fluid; a main body; an actuator positioned toward the proximal end of the body, the actuator being movable from a proximal position to a distal position to dispense fluid stored in the chamber from the needle; the body portion comprises a body protrusion and the actuator comprises a latch; The method comprises: and moving the actuator from the proximal position to the distal position such that the latch couples with the body projection when the actuator is in the distal position, and emitting an audible sound when the latch couples with the body projection. How to handle injections. twenty two. the actuator is coupled to the rotor such that movement of the actuator from a proximal position to a distal position rotates the rotor; the injection device trainer further comprises a damping element coupleable to the rotor for damping rotation of the rotor; The method further includes moving the actuator from a proximal position to a distal position, during which the damping element damps rotation of the rotor, thereby damping movement of the actuator toward the distal position. 21. The method of claim 18 or claim 20. twenty three. the actuator is coupled to the rotor such that movement of the actuator from a proximal position to a distal position rotates the rotor; the injection device further comprising a damping element coupleable to the rotor for damping rotation of the rotor; The method further includes moving the actuator from a proximal position to a distal position, while the damping element damps rotation of the rotor, thereby damping movement of the actuator toward the distal position. 22. The method of claim 19 or claim 21. It is further noted that the present invention may include the following aspects. [Aspect 1] 1. An injection device training device for training a user to use an injection device, comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion includes a body protrusion, and the actuator includes a latch arranged to engage the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position. Injection device training equipment. [Aspect 2] 2. The injection device trainer of claim 1, wherein the latch is configured to emit an audible sound when the latch engages with the body projection. [Aspect 3] 1. An injection device training device for training a user to use an injection device, comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion includes a body protrusion, and the actuator includes a latch arranged to contact the body protrusion and emit an audible sound when the actuator is in the distal position. Injection device training equipment. [Aspect 4] 4. The injection device trainer of claim 3, wherein the latch retains the actuator in the distal position when the latch is coupled with the body projection. [Aspect 5] The injection device trainer of any one of claims 1 to 3, wherein the latch comprises a resilient member. [Aspect 6] An injection device training device as described in aspect 1 or aspect 3, wherein the latch is movable between an uncoupled state in which the latch is not coupled to the body protrusion and a coupled state in which the latch is coupled to the body protrusion. [Aspect 7] An injection device training device as described in aspect 5, wherein the elastic member is arranged to move from the coupled state to the uncoupled state when a force exceeding a threshold is applied to the actuator when moving the actuator from the distal position to the proximal position. [Aspect 8] The injection device trainer of claim 1 or claim 3, wherein the latch comprises a latch biasing portion arranged to cooperate with the body protrusion to move the latch from the uncoupled state to the coupled state. [Aspect 9] 9. The injection device trainer of embodiment 8, wherein the latch comprises a resilient member that includes the latch biasing portion. [Aspect 10] The injection device trainer of any one of claims 1 to 8, wherein the latch comprises a gripping element positioned to grip the body portion in the coupled state. [Aspect 11] 11. The injection device trainer of claim 10, wherein the latch comprises a resilient member that includes the gripping element. [Aspect 12] The injection device trainer of aspects 8 and 10, wherein the latch biasing portion and the gripping element are on opposite sides of the latch. [Aspect 13] the actuator is coupled to the rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; the injection device trainer further comprises a damping element coupled or coupleable to the rotor for damping the rotation of the rotor. 4. The injection device trainer of embodiment 1 or embodiment 3. [Aspect 14] 1. An injection device comprising: a needle coupled to a chamber for storing a fluid; a main body; an actuator positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position to dispense fluid stored in the chamber from the needle; the body portion includes a body protrusion, and the actuator includes a latch arranged to engage the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position. Injection device. [Aspect 15] the actuator is coupled to the rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; the injection device further comprising a damping element coupled or coupleable to the rotor for damping the rotation of the rotor. 15. The injection device of embodiment 14. [Aspect 16] 1. An injection device comprising: a needle coupled to a chamber for storing a fluid; a main body; an actuator positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position to dispense fluid stored in the chamber from the needle; the body portion includes a body protrusion, and the actuator includes a latch arranged to contact the body protrusion and emit an audible sound when the actuator is in the distal position. Injection device. [Aspect 17] the actuator is coupled to the rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; the injection device further comprising a damping element coupled or coupleable to the rotor for damping the rotation of the rotor. 17. The injection device of embodiment 16. [Aspect 18] A kit of parts configured to be assembled into an injection device trainer according to aspect 1 or aspect 3, or into an injection device according to aspect 14 or aspect 16. [Aspect 19] 1. A method for training a user to use an injection device, the method comprising providing an injection device trainer, the injection device trainer comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion comprises a body protrusion, and the actuator comprises a latch; The method further includes moving the actuator from the proximal position to the distal position such that the latch engages with the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position. A method for training a user to use an infusion device. [Aspect 20] the actuator is coupled to the rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; the injection device trainer further comprises a damping element coupleable to the rotor to damp the rotation of the rotor; The method further includes moving the actuator from the proximal position to the distal position, during which the damping element damps rotation of the rotor, thereby damping movement of the actuator toward the distal position. 20. The method of embodiment 19. [Aspect 21] 1. A method of administering an injection, the method comprising providing an injection device, the injection device comprising: a needle coupled to a chamber for storing a fluid; a main body; an actuator positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position to dispense fluid stored in the chamber from the needle; the body portion comprises a body protrusion, and the actuator comprises a latch; The method comprises: and moving the actuator from the proximal position to the distal position such that the latch engages with the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position. How to handle injections. [Aspect 22] the actuator is coupled to the rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; the injection device further comprising a damping element coupleable to the rotor to damp the rotation of the rotor; The method further includes moving the actuator from the proximal position to the distal position, during which the damping element damps rotation of the rotor, thereby damping movement of the actuator toward the distal position. 22. The method of embodiment 21. [Aspect 23] 1. A method for training a user to use an injection device, the method comprising providing an injection device trainer, the injection device trainer comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion comprises a body protrusion, and the actuator comprises a latch; The method comprises: moving the actuator from the proximal position to the distal position such that the latch engages the body projection when the actuator is in the distal position and emitting an audible sound when the latch engages the body projection. The method for training a user to use an injection device further comprises: [Aspect 24] the actuator is coupled to the rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; the injection device trainer further comprises a damping element coupleable to the rotor to damp the rotation of the rotor; The method further includes moving the actuator from the proximal position to the distal position, during which the damping element damps rotation of the rotor, thereby damping movement of the actuator toward the distal position. 24. The method of embodiment 23. [Aspect 25] 1. A method of administering an injection, the method comprising providing an injection device, the injection device comprising: a needle coupled to a chamber for storing a fluid; a main body; an actuator positioned toward a proximal end of the body portion, the actuator being movable from a proximal position to a distal position to dispense fluid stored in the chamber from the needle; the body portion comprises a body protrusion, and the actuator comprises a latch; The method comprises: and moving the actuator from the proximal position to the distal position such that the latch engages the body projection when the actuator is in the distal position and emitting an audible sound when the latch engages the body projection. How to handle injections. [Aspect 26] the actuator is coupled to the rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; the injection device further comprising a damping element coupleable to the rotor to damp the rotation of the rotor; The method further includes moving the actuator from the proximal position to the distal position, during which the damping element damps rotation of the rotor, thereby damping movement of the actuator toward the distal position. The method according to embodiment 25.

Claims

1. 1. An injection device training device for training a user to use an injection device, comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion includes a body protrusion, and the actuator includes a latch arranged to engage the body protrusion when the actuator is in the distal position, thereby retaining the actuator in the distal position; the latch includes a resilient member configured to deflect from an initial configuration as the latch moves between a disengaged state in which the latch is not coupled to the body protrusion and a coupled state in which the latch is coupled to the body protrusion; the resilient member is arranged to move from the coupled state to the uncoupled state such that the resilient member returns to the initial configuration when a force exceeding a threshold is applied to the actuator when moving the actuator from the distal position to the proximal position. Injection device training equipment.

2. 10. The injection device trainer of claim 1, wherein the latch is configured to emit an audible sound when the latch engages the body projection.

3. 1. An injection device training device for training a user to use an injection device, comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion includes a body protrusion, and the actuator includes a latch arranged to contact the body protrusion and emit an audible sound when the actuator is in the distal position; the latch includes a resilient member configured to deflect from an initial configuration as the latch moves between a disengaged state in which the latch is not coupled to the body protrusion and a coupled state in which the latch is coupled to the body protrusion; The resilient member is arranged to move from the coupled state to the uncoupled state such that when a force exceeding a threshold is applied to the actuator when moving the actuator from the distal position to the proximal position, the resilient member returns to the initial configuration. Injection device training equipment.

4. 4. The injection device trainer of claim 3, wherein the latch retains the actuator in the distal position when the latch is coupled with the body projection.

5. 4. The injection device trainer of claim 1 or claim 3, wherein the latch comprises a latch bias portion arranged to cooperate with the body protrusion to move the latch from the uncoupled state to the coupled state.

6. 6. The injection device trainer of claim 5, wherein the latch comprises a resilient member that includes the latch biasing portion.

7. 6. The injection device trainer of claim 1, claim 3 or claim 5, wherein the latch comprises a gripping element arranged to grip the body portion in the coupled state.

8. 8. The injection device trainer of claim 7, wherein the latch comprises a resilient member that includes the gripping element.

9. An injection device training device as described in Claim 5, wherein the latch has a gripping element arranged to grip the main body portion in the connected state, and the latch deflection portion and the gripping element are on opposite sides of the latch.

10. the actuator is coupled to the rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; the injection device trainer further comprises a damping element coupled or coupleable to the rotor for damping the rotation of the rotor.

4. An injection device trainer according to claim 1 or claim 3.

11. A kit of parts configured to be assembled into an injection device trainer according to claim 1 or claim 3.

12. 1. A method of using an injection device trainer, the method comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion comprises a body protrusion, and the actuator comprises a latch; The method comprises: moving the actuator from the proximal position to the distal position such that the latch couples with the body protrusion when the actuator is in the distal position, thereby holding the actuator in the distal position, wherein coupling of the latch includes deflecting a resilient member of the latch from an initial configuration as the resilient member moves from an uncoupled state in which the latch is not coupled with the body protrusion to a coupled state in which the latch is coupled with the body protrusion; applying a force above a threshold to the actuator, moving the actuator from the distal position to the proximal position and moving the elastic member from the coupled state to the uncoupled state such that the elastic member returns to the initial configuration. How to use the injection device training device.

13. the actuator is coupled to the rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; the injection device trainer further comprises a damping element coupleable to the rotor to damp the rotation of the rotor; The method further includes moving the actuator from the proximal position to the distal position, during which the damping element damps rotation of the rotor, thereby damping movement of the actuator toward the distal position. The method of claim 12.

14. A method of using an injection device trainer, comprising: a main body; an actuator positioned toward the proximal end of the body portion, the actuator being movable from a proximal position to a distal position; the body portion comprises a body protrusion, and the actuator comprises a latch; The method comprises: moving the actuator from the proximal position to the distal position such that the latch engages the body protrusion when the actuator is in the distal position and emits an audible sound when the latch engages the body protrusion, wherein engaging the latch includes deflecting a resilient member of the latch from an initial configuration as the resilient member moves from an uncoupled state in which the latch is not coupled to the body protrusion to a coupled state in which the latch is coupled to the body protrusion; applying a force above a threshold to the actuator, moving the actuator from the distal position to the proximal position and moving the elastic member from the coupled state to the uncoupled state such that the elastic member returns to the initial configuration. How to use the injection device training device.

15. the actuator is coupled to the rotor such that movement of the actuator from the proximal position to the distal position rotates the rotor; the injection device trainer further comprises a damping element coupleable to the rotor to damp the rotation of the rotor; The method further includes moving the actuator from the proximal position to the distal position, during which the damping element damps rotation of the rotor, thereby damping movement of the actuator toward the distal position.

15. The method of claim 14.

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