Patent Publication Number: US-2023149638-A1

Title: Medicament delivery device component or add-on module for medicament delivery device

Description:
TECHNICAL FIELD 
     The invention concerns medicament delivery device components or medicament delivery device add-ons, and particularly concerns medicament delivery device components or medicament delivery device add-ons for alleviating injection pain. 
     BACKGROUND 
     Although medicament delivery devices such as pen injectors and autoinjectors can make a significant positive difference to the well-being of patients and caregivers that use them, they can still suffer from the drawback of causing pain at the injection site. The applicant has appreciated that there is further potential for alleviation of this pain. 
     SUMMARY 
     The invention is defined by the appended claims, to which reference should now be made. 
     In the present disclosure, when the term “distal direction” is used, this refers to the direction pointing away from the dose delivery site during use of the medicament delivery device. When the term “distal part/end” is used, this refers to the part/end of the delivery device, or the parts/ends of the members thereof, which under use of the medicament delivery device is/are located furthest away from the dose delivery site. Correspondingly, when the term “proximal direction” is used, this refers to the direction pointing towards the dose delivery site during use of the medicament delivery device. 
     When the term “proximal part/end” is used, this refers to the part/end of the delivery device, or the parts/ends of the members thereof, which under use of the medicament delivery device is/are located closest to the dose delivery site. 
     Further, the terms “longitudinal”, “longitudinally”, “axially” and “axial” refer to a direction extending from the proximal end to the distal end and along the device or components thereof, typically in the direction of the longest extension of the device and/or component. 
     Similarly, the terms “transverse”, “transversal” and “transversally” refer to a direction generally perpendicular to the longitudinal direction. 
     A first aspect of the invention concerns a device for alleviating injection pain, the device comprising an attachment portion for attachment to a medicament delivery device, a flexible arm extending from a first end attached to the attachment portion to a second end distal from the attachment portion, and a plurality of protrusions attached to the flexible arm. Preferably, the device is a medicament delivery device component or a medicament delivery device add-on. Such a device can reduce injection (drug delivery) discomfort. In particular, such a device can reduce injection pain by skin stimulation, distracting from the injection and reducing the subjective pain and/or discomfort of injection, particularly during the injection itself. 
     Preferably, the width of the second end of the flexible arm is thinner than the width of the first end of the flexible arm. Preferably, the width of the flexible arm tapers from the first end to the second end. The flexible arm is more flexible at the second end than at the first end. Such configurations can result in provision of an increasing pressure applied by the device around the injection site as the device is pushed towards the injection site. 
     Preferably the protrusions are distributed along the flexible arm between the first end and the second end, for example along at least half of the length of the flexible arm, or more preferably along at least three-quarters of the length of the flexible arm. Preferably, the protrusions proximal to the first end of the flexible arm are longer than the protrusions proximal to the second end of the flexible arm. Such configurations can result in provision of an increased sensation applied by the device around the injection site as the device is pushed towards the injection site. 
     Preferably, the device extends along an axis from a proximal end to a distal end, wherein the first end of the flexible arm is closer to the distal end than the second end of the flexible arm. Preferably, the second end of the flexible arm is further from an axis than the first end of the flexible arm. Preferably, wherein the flexible arm describes an arc. Such configurations can help the arms spread reliably as the device is pushed towards the injection site. 
     Preferably, the device comprises a plurality of flexible arms, each flexible arm comprising a plurality of protrusions. This can provide a greater effect than a single arm. Preferably, the device is a medicament delivery device add-on and the attachment portion is removably attachable to a medicament delivery device. 
     A second aspect of the invention concerns a medicament delivery device comprising the device described above. Preferably, the flexible arm is closer than the attachment portion to a proximal end of the medicament delivery device. 
     Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to a/an/the element, apparatus, member, component, means, etc. are to be interpreted openly as referring to at least one instance of the element, apparatus, member component, means, etc., unless explicitly stated otherwise. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments of the invention will now be described by way of example only and with reference to the accompanying drawings, in which: 
         FIG.  1    shows an example device. 
         FIG.  2    shows a side view of one embodiment of the device of  FIG.  1   . 
         FIG.  3    shows a side view of another embodiment of the device of  FIG.  1   . 
         FIG.  4    shows a side view of an autoinjector comprising the device of  FIG.  1    before carrying out an injection. 
         FIG.  5    shows a side view of the autoinjector of  FIG.  4    whilst carrying out an injection. 
     
    
    
     DETAILED DESCRIPTION 
       FIGS.  1  and  2    show a device  10  for alleviating injection pain, the device comprising an attachment portion  12  for attachment to a medicament delivery device, a flexible arm  14  extending from a first end  16  attached to the attachment portion to a second end  17  distal from the attachment portion, and a plurality of protrusions  18  attached to the flexible arm. The device is a medicament delivery device component or a medicament delivery device add-on. 
       FIG.  2    shows the device  10  relative to an axis  20  (central axis), with the device  10  extending from a proximal end  22  to a distal end  24 . In  FIG.  2   , the protrusions are all the same size.  FIG.  3    shows a similar device, but with protrusions of varying sizes, with protrusions closer to the attachment portion being larger than protrusions further from the attachment portion. 
       FIGS.  4  and  5    show the device  10  attached to a medicament delivery device, in this case an autoinjector  30 . A medicament delivery member shield  32  of the autoinjector can also be seen.  FIG.  4    shows the autoinjector prior to injection and  FIG.  5    shows the autoinjector during injection. 
     To use the device  10 , the device is first attached to a medicament delivery device, for example by an end user prior to use of a medicament delivery device or by a manufacturer during manufacture of the medicament delivery device, particularly where the device is a medicament delivery device component. An injection can then be carried out as normal with the medicament delivery device. As the device is pressed against the skin, the flexible arms flex outwards away from the axis  20 , and the protrusions  18  rub across the skin, providing a sensation that can distract from injection pain. Once an injection has been completed, the medicament delivery device can be removed from the skin. If the flexible arms are plastically deformable, they can then return back to (roughly) their original position, allowing for multiple uses of the device (either on the same medicament delivery device if the medicament delivery device is reusable, and/or on another medicament delivery device if the device is removable). 
     The device described herein can be considered to be a pain alleviation device, as it can alleviate injection pain. The device could be a medicament delivery add-on in its own right, as shown in the examples in the Figures, or it could be a medicament delivery device component, such as a medicament delivery member guard or a housing that includes the flexible arms described herein. 
     Various designs are possible for the attachment portion  12 . For example, the attachment portion could attach with a friction lock (as shown in the examples in the Figures), or could have a clip, a lock, or another kind of attachment. The attachment portion could also be adhered to the medicament delivery device. The attachment could be permanent or removable—that is, the device could be designed to be removable or to be permanently attached to a medicament delivery device. Providing a removable attachment would allow for the attachment to be reused on another medicament delivery device. 
     In examples where the device is a medicament delivery device component, the attachment portion would attach the component to the rest of the medicament delivery device. The component could be a housing or a medicament delivery member guard, for example. 
     The attachment portion would typically be a distal portion of the device. The attachment portion is shown as a ring in the example in  FIGS.  1  and  2   , though it could have various other shapes. The attachment portion is shown with a circular cross-section perpendicular to the axis  20  in  FIG.  1   , though it could have a different shaped cross-section such as a triangular, square or irregularly shaped cross-section. The attachment portion could also be flexible to allow attachment to different device diameters and shapes, which has the advantage of allowing the device to be used with various different medicament delivery devices. Alternatively, the attachment portion could be rigid; this could be beneficial in that it could limit use to a specific device or devices, thereby avoiding use of the device on the wrong type of medicament delivery device. 
     Various designs are also possible for the arms  14 . Four arms are shown on the examples in the Figures, though 1, 2, 3 or more arms could alternatively be provided. The arms shown are all the same, though the arms could also differ from one another. The arms are shown tapering from a wider part at the end attached to the attachment portion (first end) down to a thinner part at the end distal from the attachment portion (second end), though the arms could also be the same width for their full length. The arms are shown tapering by variation in width in both a radial direction  25  relative to the axis and a circumferential direction relative to the axis, though the arms could alternatively only taper in the radial direction  25  or in the circumferential direction  26 . The arms are shown as arc-shaped (describe an arc) when viewed from the side (i.e. the shape such as that shown for two of the arms in  FIG.  2   , or in other words, when a cross-section along the perpendicular axis and through an arm is taken and viewed in a direction perpendicular to the axis  20 , the arms are arc-shaped), though they could alternatively be another shape, such as straight. The second end is shown as being further from the axis than the first end, though this is also optional, and the arms could be parallel to the axis, for example. 
     Various options are also possible for the protrusions  18 . The Figures show six protrusions on each arm, though more or fewer protrusions could be provided. The protrusions are shown evenly distributed along the length of the arms, though the protrusions could be unevenly spaced and/or only provided along part of the length of the arms. The protrusions are shown as a tapered spike with a sharp end, but could also have other shapes and/or could be blunt ended protrusions (e.g. a frustoconical shape or a cylindrical shape).  FIG.  2    shows an example with the protrusions all the same size, and  FIG.  3    shows longer protrusions closer to the first end of the flexible arm, with the protrusion length reducing as a function of distance from the first end of the flexible arm. Irregular patterns of protrusion length and width are also possible. The provision of protrusions in general is also optional. 
     The example shown in  FIGS.  4  and  5    shows an autoinjector, but the device could be used on other medicament delivery devices such as pen injectors, for example. A suitable autoinjector could include features such as an outer housing, a medicament delivery member guard, a syringe comprising a medicament barrel and a medicament delivery member, and/or a powerpack, for example. 
     Various modifications to the embodiments described are possible and will occur to those skilled in the art without departing from the invention which is defined by the following claims.