WO2025106005A1

WO2025106005A1 - An earplug for administering a fluid agent into an ear canal

Info

Publication number: WO2025106005A1
Application number: PCT/SE2024/050971
Authority: WO
Inventors: Urban ROSELL; Nicolas Svensson; Per Persson; Tobias LJUNGBERG
Original assignee: Viaauris AB
Current assignee: Viaauris AB
Priority date: 2023-11-17
Filing date: 2024-11-14
Publication date: 2025-05-22
Anticipated expiration: 2026-05-17
Also published as: SE547364C2; SE2351311A1

Abstract

An earplug (1) for administering a fluid agent into an ear canal is provided. 1. The earplug comprises a first part (10) adapted for insertion in the ear canal. The first part comprises an elongated member (11) having a chamber (12) for containing the fluid agent. The chamber (12) has at least one outlet (13) at a proximal end of the elongated member (11). The first part (10) further comprises a malleable member (17) disposed laterally and proximally of the elongated member (11) covering the outlet (13). The earplug comprises a second part (20) comprising a piston (21) having a first end (22) insertable in the elongated member (11); and a second end (23) which has a push member (24). The piston (21) is displaceable from a first position (A) distally of the chamber (12) to a second position (B) within the chamber (12), and the malleable member (17) comprises at least one through hole (17') arranged in a lateral side surface of the malleable member (17), such that the fluid agent is injected from the chamber (12) through the outlet (13) and further through the at least one through hole (17') into the ear canal when the piston (21) is displaced from the first position (A) to the second position (B).

Description

AN EARPLUG FOR ADMINISTERING A FLUID AGENT INTO AN EAR CANAL

Technical Field

The present invention generally relates to earplugs. More particularly, the present invention generally relates to an earplug for administering fluid to an ear canal of a person. The invention also relates to a method of administering a liquid medicament to a person using said earplug.

Background

As is well known, many people have a need for treatment or relieve of different diseases, disorders or conditions by administration of different medicaments or agents. Known devices, administration methods and compositions are however in some cases not as efficient, convenient or reliable as desired.

In light of the observations above, the present inventors have realized that there is room for improvements when it comes to devices, administration methods and compositions for treating or relieving medical or health conditions.

Summary

It is accordingly an object of the invention to eliminate or alleviate at least some of the problems or drawbacks referred to above.

A first aspect of the present invention therefore is an earplug for administering a fluid agent into an ear canal. The earplug comprises a first part adapted for insertion in the ear canal. The first part comprises an elongated member having a chamber for containing the fluid agent. The chamber has at least one outlet at a proximal end of the elongated member. The first part further comprises a malleable member disposed laterally and proximally of the elongated member covering the outlet. The earplug further comprises a second part comprising a piston having a first end which is insertable in the elongated member; and a second end which has a push member. The piston is displaceable from a first position distally of the chamber to a second position within the chamber, and the malleable member comprises at least one through hole arranged in a lateral side surface of the malleable member, such that the fluid agent is injected from the chamber through the outlet and further through the at least one through hole into the ear canal when the piston is displaced from the first position to the second position. Accordingly, when the earplug is positioned in the ear canal of a person prior to injection of said fluid agent into the ear canal of said person, the chamber and the fluid agent contained therein are positioned in the ear canal of said person.

The provision of an earplug as disclosed herein will solve or at least mitigate one or more of the problems or drawbacks identified in the Background section of this document. These and other aspects, objectives, features and advantages of the invention and its disclosed embodiments will appear from the following detailed disclosure, from the attached dependent claims as well as from the drawings. A key feature of the earplug is the user convenience it offers. The user may simply insert the earplug into the ear canal, actuate the push member to inject the fluid agent, and then leave the earplug in place for the duration of the treatment. This will keep the injected fluid agent in place in the ear canal (as opposed to leaking out) and thus increase the efficiency of the treatment. Further, when the fluid agent exits the outlet and flows further through the through holes of the malleable member, the fluid agent will accumulate on the sides of the earplug, and will not be administered directly towards the ear drum. This is beneficial since it is more gentle against the ear drum than if a fluid medicament is administered directly towards the ear drum. Additionally, the skin in the outer ear canal is thicker and has a higher amount of capillaries present compared to the skin in the inner ear canal closer to the ear drum. A higher amount of capillaries results in a more efficient uptake of the medicament present in the liquid. The outer ear canal also has a higher amount of sebaceous glands compared to the inner ear canal. The earplug of the present invention thus provides a more efficient uptake of a fluid medicament administered in the ear canal.

In one embodiment, when the fluid agent is injected from the chamber through the outlet, a proximal end of the malleable member is expanded by the fluid agent, whereby the fluid agent flows distally between the lateral side surface of the malleable member and an outer circumferential wall of the elongated member, and exits the earplug through the at least one through hole.

In another embodiment, the malleable member is made of a material selected from the group consisting of silicone rubber, neoprene, and ethylene propylene diene monomer rubber.

In yet another embodiment, the malleable member has a plurality of resilient flanges distributed in a longitudinal main direction of the malleable member.

In one embodiment, the at least one through hole is arranged between at least two of the resilient flanges. In another embodiment, the plurality of resilient flanges of the malleable member have decreasing radial sizes, a first flange at or near the proximal end of the elongated member having a smallest radial size and a last flange at or near the distal end of the elongated member having a largest radial size.

In another embodiment, the earplug comprises at least two, three or four through holes each being arranged between the plurality of resilient flanges.

A second aspect of the present invention is a method of administering a liquid medicament to a person, the method comprising: providing an earplug as described above, the earplug having an internal container for the liquid medicament, and an injector mechanism; inserting the earplug in an ear canal of the person; actuating the injector mechanism to cause injection of the liquid medicament from the internal container of the earplug to the ear canal of the person; leaving the earplug in place in the ear canal for a duration of treatment; and removing the earplug from the ear canal when the duration of treatment has lapsed.

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, device, component, means, step, etc.]" are to be interpreted openly as referring to at least one instance of the element, device, component, means, step, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

A reference to an entity being “designed for” doing something, or “capable of’ doing something in this document is intended to mean the same as the entity being “arranged for”, “configured for” or “adapted for” doing this very something, and vice versa.

Brief Description of the Drawings

Fig. 1 illustrates an embodiment of an earplug for administering a fluid agent into an ear canal.

Fig. 2 is an exploded side view of the earplug in Fig 1.

Fig. 3 is an exploded isometric view of the earplug of Fig. 1. Fig. 4 is a sectional isometric view of a part of the earplug in Fig 1, showing a malleable member.

Fig. 5 is a sectional side view of a part of the earplug to be inserted in the ear canal, in the first position.

Detailed Description

Embodiments of the invention will now be described with reference to the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The terminology used in the detailed description of the particular embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like numbers refer to like elements. In this detailed description the terms proximal and distal are used in relation to the person on which an earplug is applied. This means that proximal is used to indicate towards the person, while distal is used to indicate away from the person. The terms lateral and central are used in relation to the central axis of an earplug - positioned in the ear canal of a person or to be positioned in an ear canal of a person.

Figs. 1 to 5 disclose an earplug 1 according to an embodiment of the present invention. The earplug 1 comprises a first part 10 adapted for insertion in the ear canal of a person. The first part 10 comprises an elongated member 11. The elongated member 11 is provided with a chamber 12. The chamber 12 is configured to contain a fluid agent, to be administered, such as injected into an ear canal of a person. The chamber 12 is a central chamber positioned centrally of an outer circumferential wall of the elongated member 11. When the earplug 1 is positioned in the ear canal of a person, the chamber 12, comprising the fluid agent, is positioned in the ear canal of the person. This makes the earplug 1 compact, and decreases spill of the fluid agent. The chamber 12 has an outlet 13, as shown in Fig. 5. The outlet 13 is arranged at a proximal end of the elongated member 11. The outlet 13 is in the form of a through hole in the proximal end of the elongated member 11.

The elongated member 11 is provided laterally and proximally with a malleable member 17. Hence, the malleable member 17 covers the proximal end and the outer circumferential wall of the elongated member 11, as shown in Fig. 5. Further, the malleable member 17 is provided with at least one through hole 17’, arranged in lateral side surfaces 17a of the malleable member 17. The malleable member 17 conforms to the inner surface of the ear canal, to seal off the ear canal from the ambiance and prevents administered fluid to leak out of the ear canal.

The distal end of the malleable member 17 is an open end configured to receive the elongated member 11. The proximal end of the malleable member 17 is a closed end, configured to cover the proximal end of the elongated member 11 and thus also cover the outlet 13.

The malleable member 17 may comprise a plurality of resilient flanges 18. The resilient flanges 18 extend laterally. The resilient flanges 18 may be distributed longitudinally in a longitudinal main direction 19, i.e. proximodistal direction, of the earplug 1. At least the most distal resilient flange 18d may be curve shaped, convex from proximal perspective and concave from a distal perspective, which improves adaptation to different persons and the sealing effect.

The radial/lateral extension of the resilient flanges 18 may decrease along the elongated member in the proximal direction. Hence, the most proximal resilient flange 18a may have the smallest radial/lateral extension, and the most distal resilient flange 18d may have the greatest radial/lateral extension. This configuration facilitates insertion of the earplug 1, and adapts to dimensional variations of ear canals in different persons.

Preferably, the through openings 17’ are arranged in line with each other, along the proximodistal direction 19 of the malleable member 17. As shown in Figs 1-6, the malleable member 17 is provided with four through holes 17’ in total, each being arranged between the second most distal resilient flange 18c, the middle resilient flange 18b, and the most proximal resilient flange 18a. The through holes 17’ are arranged in pairs facing opposite side surfaces 17a of the malleable member 17.

The malleable member 17 is preferably made from a flexible and/or elastic material. The malleable member 17 may be of a suitable rubber material, such as a silicone rubber, neoprene, ethylene propylene diene monomer rubber, and the like. These materials conform well with the ear canal of a person and provides good sealing effect towards the ear canal, such that the fluid does not leak out from the ear canal into the surroundings. In this way the earplug 1 may be used to administer ear wax dissolving agents, such as Debrox, Kyrosol, Revaxbr, Waxsol, Earclear, comprising active agents, such as carbamide peroxide, docusate sodium, An additional benefit of the malleable member 17 in embodiments of the invention is that it may also serve to acoustically seal off the ear canal and thus the inner ear from the surroundings. In other words, the earplug may have an additional function to reduce ambient noise, which may be particularly beneficial in embodiments where the fluid agent is an agent, such as melatonin, that seeks to relieve the user from insomnia or stress disorders. The user may then enjoy two relieving effects from using the earplug: a first effect caused by ingestion of the fluid agent into the user’s bloodstream through the thin skin in the ear canal, and a second effect obtained by reduction of ambient noise.

The inventors have surprisingly found that medical agents can be administered through the ear canal, entering the blood stream through the skin in an effective way using the earplug 1 according to the present invention. Tests where a 56 year old male, another 56 year old male, as well as a 66 year old male were administered 2 mg melatonin in the ear canal have yielded efficient results. Since melatonin is entering the bloodstream through the ear canal, there is no reason to believe that other active agents, capable of penetrating skin, i.e. transdermal drug delivery (TDD), should not be able to be administered through the ear canal. TDD is a painless method of delivering drugs systemically by applying a drug formulation onto intact and healthy skin. The drug initially penetrates through the stratum corneum and then passes through the deeper epidermis and dermis without drug accumulation in the dermal layer. When drug reaches the dermal layer, it becomes available for systemic absorption via the dermal microcirculation. TDD has many advantages over other conventional routes of drug delivery. It can provide a non-invasive alternative to parenteral routes, thus circumventing issues such as needle phobia. A large surface area of skin and ease of access allows many placement options on the skin for transdermal absorption. Furthermore, the pharmacokinetic profiles of drugs are more uniform with fewer peaks, thus minimizing the risk of toxic side effects. It can improve patient compliance due to the reduction of dosing frequencies and is also suitable for patients who are unconscious or vomiting, or those who rely on self-administration. TDD avoids pre-systemic metabolism, thus improving bioavailability. With reference to the use of the skin as a novel site for vaccination strategies, this organ is known to be replete with dendritic cells in both the epidermal and dermal layers, which play a central role in immune responses making TDD an attractive vaccination route for therapeutic proteins and peptides. The requirement for an inexpensive and non-invasive means of vaccination, especially in the developing world, has given rise to substantial research focused on the development of simple, needle-free systems, such as TDD, for vaccination purposes. There are two possible routes of drug penetration across the intact skin, namely the transepidermal and transappendegeal pathways. The transepidermal pathway involves the passage of molecules through the stratum corneum, an architecturally diverse, multilayered and multi-cellular barrier. Transepidermal penetration can be termed intra- or inter-cellular. The intra-cellular route through corneocytes, terminally differentiated keratinocytes, allows the transport of hydrophilic or polar solutes. Transport via intercellular spaces allows diffusion of lipophilic or non-polar solutes through the continuous lipid matrix. The transappendegeal route involves the passage of molecules through sweat glands and across the hair follicles.

As a consequence, ear canal TDD should be applicable for numerous active agents, such as nicotine; opioids, such as fentanyl and buprenorphine; nitroglycerin; scopolamine; clonidine; vitamins, such as vitamin B12; selegiline; 5- Hydroxytryptophan (5-HTP); hormones, such as melatonin, estradiol, ethinylestradiol, testosterone, progesterone, nor ethisterone acetate, norelgestromin, levonorgestrel, etc; agents acting on muscarinic receptors, such as tolterodine and oxybutynin; norepinephine-dopamine reuptake inhibitors, such as methylphenidate; dopamine agonists, such as rotigotine; cholinesterase inhibitors, such as rivastigmine; serotonin receptor antagonists, such as granisetron, etc. As such ear canal TDD with the earplug 1 according to the present invention can be used to treat an indication selected from the group comprising sleep disorders, such as insomnia; stress disorders; nicotine dependency; pain; heart disorders; vitamin insufficiency; motion sickness; blood pressure deviations; mood disorders, such as depression, anxiety, and attention deficit hyperactivity disorder (ADHD); hormone deviations, such as menopausal disorders and birth control; weight gain; urination disorders, such as frequent urination, urinary incontinence, or urinary urgency; Parkinson's disease (PD); Alzheimer’s disease; and nausea and vomiting.

Returning to Figs. 1-3, the earplug 1 further comprises a second part 20. The second part 20 is arranged distally of the first part 10. The second part 20 comprises a piston 21. The piston 21 has a proximal first end 22, which is configured to be inserted into the elongated member 11. The piston 21 is configured to be inserted into the distal end of the elongated member 11, and into the chamber 12. The outer/lateral end surface of the proximal end of the piston 21 conforms to the shape and dimensions of the inner surface of elongated member 11, defining the chamber 12. In this way proximal movement of the piston 21 will effectively be able to expel fluid from the earplug 1 via proximal movement within the chamber 12, such that fluid is forced through the outlet 13 of the chamber 12, and further exits the earplug 1 through the through holes 17’ of the malleable member 17. This will be explained more in the following.

At the distal end of the second member 20, the second member 20 is provided with a push member 24. The push member 24 is disclosed in the present embodiments as a push plate 24. The piston 21 is, in accordance with above, displaceable from a first position A, as shown in Fig. 1, distally of the chamber 12 to a second position B within the chamber 12 (not shown), such that the fluid agent is injected from the chamber 12. When the piston 21 is pushed from the first position A as shown in Fig. 1, to the second position B, the fluid agent is forced through the outlet 13 of the chamber 12. The ejection of the fluid agent from the outlet 13 forces the proximal end of the malleable member 17 to expand. This allows for the fluid agent to flow distally between the outer circumferential wall of the elongated member 11 and the lateral side surfaces 17a of the malleable member 17. When the fluid agent reaches the through holes 17’, the fluid agent will exit the earplug 1 through the through holes 17’. The fluid agent will then accumulate between the plurality of resilient flanges 18. This allows for an efficient administration and uptake of the medicament present in the fluid agent.

Hence, the malleable member 17 has the advantage of first providing a seal, maintaining the liquid inside the chamber 12 and secondly expand and allow liquid to exit the outlet 13 and flow further to exit the earplug through the through holes 17’, while containing the liquid between the resilient flanges 18.

The second part 20 comprises a flexible cover 25. The flexible cover 25 is attached at its proximal end to the first part 10. The flexible cover 25 encapsulates the piston 21 and the push member 24 in the first position A, as shown in Fig. 1. In this manner, the flexible cover 25 protects the piston 21 and the push member 24, and encapsulates the distal end of the first member 10, such that the risk of tampering with fluid in the chamber 12 is decreased. The flexible cover 25 has a flexibility allowing for proximal movement of the piston 21 upon an applied proximal push force at on the piston 21 via the flexible cover 25. Pushing onto the flexible cover 25 and the piston 21 displaces the piston 21 proximally from the first position A to the second position B, to inject the fluid into the ear canal of a person. After displacement of the piston 21 in the proximal direction and injecting fluid into the ear canal of a person, the flexible cover 25 remains attached to the first part 10 and continues to extend distally from the first part 10. In this position the flexible cover may serve as a handle for subsequent removal of the earplug 1 from the ear canal. At the distal end of the elongated member 11 of the first part 10 an end cup 16 may be arranged. The end cup 16 allows for proximal back-side surface for the flexible cover 25 to attach to, such that the flexible cover 25 may encapsulate the piston 21 and the distal opening of the chamber 12 in the above described manner. Further, the attachment of the flexible cover 25 on the proximal side of the end cup 16 decreases the risk of the flexible cover 25 to detach upon the removal force in the distal direction. Also, the end cup 16 is configured to receive the push member 24, such as a push plate, when the piston 21 has been displaced from position A to position B. When the end cup 16 receives the push member 24, the distal end surface of the push member 24 may be aligned with or positioned proximally of the distal end of the circumferential socket of the end cup 16. In this way, the end cup 16 may facilitate maintenance of the piston 21 in position B.

The piston 21 may be provided with a sealing member 27 at its proximal end zone. The sealing member 27 may comprise an o-ring gasket that sits in a circumferential groove 26. This is shown on Fig. 3. In this way displacement of the sealing member 27 in the proximodistal direction upon displacement of the piston 21 from position A to B may be avoided. Correspondingly, the elongated member 11 may have a circumferential groove in the chamber 12, at an distal end zone of the chamber 12. The circumferential groove is configured to receive the lateral part of the sealing member 27 in the first position A. This means that there is a need of an initiation force to displace the piston 21 in the proximal direction, which decreases the risk of unintentional ejection of fluid from the chamber 12.

A method of administering a liquid medicament to a person will now be described. The method involves the following steps: i) providing an earplug as disclosed herein, the earplug having an internal container for the liquid medicament, and an injector mechanism; ii) inserting the earplug in an ear canal of the person; iii) actuating the injector mechanism to cause injection of the liquid medicament from the internal container of the earplug to the ear canal of the person; iv) leaving the earplug in place in the ear canal for a duration of treatment; and v) removing the earplug from the ear canal when the duration of treatment has lapsed.

The earplug 1 as described with reference to Fig. 1 to Fig. 5 may advantageously be used in this method. The method is advantageously a method for treating an indication selected from the group consisting of sleep disorders, such as insomnia; stress disorders; nicotine dependency; pain; heart disorders; vitamin insufficiency; motion sickness; blood pressure deviations; mood disorders, such as depression, anxiety, and attention deficit hyperactivity disorder (ADHD); hormone deviations; weight gain; urination disorders, such as frequent urination, urinary incontinence, or urinary urgency; Parkinson's disease (PD); Alzheimer’s disease; and nausea and vomiting

The invention has been described above in detail with reference to embodiments thereof. However, as is readily understood by those skilled in the art, other embodiments are equally possible within the scope of the present invention, as defined by the appended claims.

Claims

1. An earplug (1) for administering a fluid agent into an ear canal, the earplug comprising: a first part (10) adapted for insertion in the ear canal, said first part comprising: an elongated member (11) having a chamber (12) for containing the fluid agent, the chamber (12) having at least one outlet (13) at a proximal end of the elongated member (11); and a malleable member (17) disposed laterally and proximally of the elongated member (11) covering the outlet (13); a second part (20) comprising a piston (21), the piston having: a first end (22) which is insertable in the elongated member (11); and a second end (23) which has a push member (24), wherein the piston (21) is displaceable from a first position (A) distally of the chamber (12) to a second position (B) within the chamber (12), and wherein the malleable member (17) comprises at least one through hole (17’) arranged in a lateral side surface (17a) of the malleable member (17), such that the fluid agent is injected from the chamber (12) through the outlet (13) and further through the at least one through hole (17’) into the ear canal when the piston (21) is displaced from the first position (A) to the second position (B).

2. The earplug (1) as defined in claim 1, wherein when the fluid agent is injected from the chamber (12) through the outlet (13), a proximal end of the malleable member (17) is expanded by the fluid agent, whereby the fluid agent flows distally between the lateral side surface (17a) of the malleable member (17) and an outer circumferential wall of the elongated member (11) and exits the earplug (1) through the at least one through hole (17’).

3. The earplug (1) as defined in claim 1 or 2, wherein the malleable member (17) is made of a material selected from the group consisting of silicone rubber, neoprene, and ethylene propylene diene monomer rubber.

4. The earplug (1) as defined in any preceding claim, wherein the malleable member (17) has a plurality of resilient flanges (18) distributed in a longitudinal main direction (19) of the malleable member (17).

5. The earplug (1) as defined in claim 4, wherein the at least one through hole (17’) is arranged between at least two of the resilient flanges (18).

6. The earplug (1) as defined in claim 4 or 5, wherein the plurality of resilient flanges (18; 18a-18d) of the malleable member (17) have decreasing radial sizes, a first flange (18a) at or near the proximal end of the elongated member (11) having a smallest radial size and a last flange ( 18d) at or near the distal end (15) of the elongated member (11) having a largest radial size.

7. The earplug (1) as defined in any preceding claim, wherein the earplug (1) comprises at least two, three or four through holes (17’) each being arranged between the plurality of resilient flanges (18).

8. The earplug (1) as defined in any preceding claim, wherein the second part (20) further comprises a flexible cover (25) attached to the first part (10) and being configured for encapsulating the piston (21) and the push member (24) in the first position (A).

9. The earplug (1) as defined in claim 8, wherein the flexible cover (25) is further configured for allowing the piston (21) to be displaced to the second position (B) by actuation of the push member (24) and for remaining attached to the first part (10) also in the second position (B), the flexible cover (25) thereby serving as a handle for subsequent removal of the earplug (1) from the ear canal.

10. The earplug (1) as defined in any preceding claim, wherein the elongated member (11) of the first part (10) further comprises an end cup (16) at a distal end thereof, wherein the flexible cover (25) encapsulates the end cup (16) and wherein the end cup (16) is shaped and configured for retaining the flexible cover (25) attached to the first part (10).

11. The earplug (1) as defined in any preceding claim, wherein the piston (21) has a sealing member (27) near or at the first end (22), preferably wherein the sealing member (27) comprises an o-ring gasket and wherein the piston (21) has a circumferential groove (26) near or at the first end (22) for receiving the o-ring gasket.

12. The earplug (1) as defined in claim 10 or 11, wherein the elongated member (11) has a circumferential groove near or at the distal end, the circumferential groove being configured for receiving at least a part of the sealing member (27) of the piston (21) in the first position (A) of the piston (21).

13. A method of administering a liquid medicament to a person, the method comprising: providing an earplug (1) according to any one of the claims 1 to 12; inserting the earplug (1) in an ear canal of the person; actuating the injector mechanism to cause injection of the liquid medicament from the internal container of the earplug to the ear canal of the person; leaving the earplug (1) in place in the ear canal for a duration of treatment; and removing the earplug (1) from the ear canal when the duration of treatment has lapsed.

14. The method as defined in claim 13, wherein the method is a method for treating an indication selected from the group consisting of sleep disorders, such as insomnia; stress disorders; nicotine dependency; pain; heart disorders; vitamin insufficiency; motion sickness; blood pressure deviations; mood disorders, such as depression, anxiety, and attention deficit hyperactivity disorder (ADHD); hormone deviations; weight gain; urination disorders, such as frequent urination, urinary incontinence, or urinary urgency; Parkinson's disease (PD); Alzheimer’s disease; and nausea and vomiting.