Abstract:
An ear canal dryer that removes excess fluid or moisture retained in the outer ear canal. The ear canal dryer comprises a bulb and a speculum, each having an air flow controller. By inserting the speculum into the ear canal and squeezing the bulb, an air stream is injected into the ear canal causing evaporation of fluid and carrying the moisture out of the canal. The ear canal dryer of the present invention is easy to carry and use. It can be manufactured at a low cost and may also be adapted for veterinary use.

Description:
TECHNICAL FIELD  
         [0001]    The technical field relates to medical devices in general, and in particular to a device for removing excess moisture retained in the outer ear canal.  
         BACKGROUND  
         [0002]    The ear is a complex structure that consists of three sections: the outer, middle, and inner ears. The outer ear (also called outer ear canal) is the short passage from the outside of the ear to the ear drum, which is an inch or so inside the ear of human beings. Infection of the outer ear (infective otitis externa) is quite common. The infection causes swelling, redness, heat and pain, and is often associated with temporary deafness as swelling and discharge may block the ear canal. The infection-related swelling may also affect the ear drum itself.  
           [0003]    Infective otitis externa is usually caused by a bacteria or fungus infection of the outer ear canal. The infection can happen to anyone. One of the most common causes is swimming in bacteria-infected waters. Another common cause is excess moisture in the outer ear canal, which creates a moist environment that bacteria and fungi find most attractive for growth. The excess moisture in the outer ear canal may be generated by water retention in the ear after a shower or swimming, by wearing a hearing aid that blocks air circulation in the outer ear for an extended period of time, or by certain ear diseases such as mastoid cavities, tympanic membrane perforations and abnormal ear canal structures with reduced ear canal openings.  
           [0004]    The commonly recommended method for removing excess moisture retained in the outer ear canal is to use a hair dryer to blow air into the ear. It has been suggested to aim a hair dryer to the ear from 18 to 20 inches away, using either a warm or cool setting. However, it was difficult to force air into a small closed-end opening such as the ear canal even with a hair dryer. In fact, the air flow created by the hair dryer held at a distance from the ear actually compresses the existing air in the ear canal and does not provide the requisite air circulation needed to dry the moisture.  
           [0005]    U.S. Pat. No. 5,979,072 to Collins et al. generally describes an external ear canal drying apparatus that is capable of blowing heated air into the ear canal through an adaptor that fits the opening of outer ear. The electrical-powered, motorized device, however, is complicated and expensive to manufacture. In addition, its pistol shaped configuration would make it questionable for air travel by users. There still exists the need for a simple, inexpensive and easy-to-use device that can efficiently and safely remove moisture from outer ear canal.  
         SUMMARY  
         [0006]    The present invention is directed to an ear canal dryer that removes excess fluid or moisture retained in the outer ear canal. The ear canal dryer of the present invention includes a bulb and a speculum, each having an air flow controller. By inserting the speculum into the ear canal and squeezing the bulb, an air stream is injected into the ear canal causing evaporation of fluid and carrying the moisture out of the canal through escape vents along the outer surface of the speculum. The air flow controllers in the bulb and speculum serve two major functions: (1) directing the air stream into the ear canal and (2) preventing the moisture-laden air expelled from the ear canal to re-enter the bulb. The ear canal dryer of the present invention is easy to carry and use. It can be manufactured at a low cost and may also be adapted for veterinary use.  
           [0007]    Presently preferred embodiments of the inventions are described below in the Detailed Description of the Invention. Unless specifically noted, it is intended that the words and phrases in the specification and claims be given the ordinary and accustomed meaning to those of ordinary skill in the applicable art or arts. If any other meaning is intended, the specification will specifically state that a special meaning is being applied to a word or phrase.  
           [0008]    It is further intended that the inventions not be limited only to the specific structure, material or acts that are described in the preferred embodiments, but in addition, include any and all structures, materials or acts that perform the claimed function, along with any and all known or later-developed equivalent structures, materials or acts for performing the claimed function.  
           [0009]    For example, the disclosed device and method make use of ball-check valves to control air flow in and out of the bulb. Other air flow control mechanisms, such as manually activated external air check valves such used in conjunction with a bulb in a sphygmometer, could likewise be used. Thus, ball-check valves are shown and referenced generally throughout this disclosure, and unless specifically noted, are intended to represent any and all air flow control mechanisms appropriate to utilize the principles taught herein.  
           [0010]    Likewise, there is disclosed a grooved speculum that directs the air flow into the ear canal. The specific shape and form of the grooved speculum can vary. It will be realized by those of ordinary skill in the art that the invention can be implemented using grooved speculums of various shapes as long as they may effectively direct the air flow to the outer ear canal and facilitate the air exchange in the ear. Thus, it is not Applicant&#39;s intention to limit his invention to any particular form of grooved speculum.  
           [0011]    Further examples exist throughout the disclosure, and it is not Applicant&#39;s intention to exclude from the scope of his invention the use of structures, materials, or acts that are not expressly identified in the specification, but nonetheless are capable of performing a claimed function.  
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0012]    The detailed description will refer to the following drawings, in which like numerals refer to like elements, and in which:  
         [0013]    [0013]FIG. 1 illustrates an embodiment of an ear canal dryer in accordance with the principles of the present invention, and  
         [0014]    [0014]FIGS. 2A, 2B and  2 C illustrate top, side, and sectional views, respectively, of a grooved speculum. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0015]    The following detailed description is presented to enable any person skilled in the art to make and use the invention. For purposes of explanation, specific nomenclature is set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not required to practice the invention. Descriptions of specific applications are provided only as representative examples. Various modifications to the preferred embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the invention. The present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest possible scope consistent with the principles and features disclosed herein.  
         [0016]    [0016]FIG. 1 depicts an embodiment of an ear canal dryer, generally designated by the reference numeral  100 , utilizing the principles of the present invention. The ear canal dryer  100  includes an elastic bulb and a speculum, generally designated by the reference numerals  102  and  104 , respectively. The elastic bulb  102  contains an air intake controller  106 , as shown in the cut-out view, and an air exhaust port  108 . It is well understood to one skilled in the art that the elastic bulb  102  can be of various sizes and can be made of any elastic material. In a preferred embodiment, the elastic bulb  102  is an approximately two ounce plastic/rubber bulb commonly used in medical devices, such as a sphygmometer. The air exhaust port  108  is so shaped to be connected to the speculum  104 , which comprises a base  110  and a tapered head  112 , as shown in the upper portion of FIG. 1.  
         [0017]    Referring now to the speculum  104 , an air passageway  114  within the base  110  and the tapered head  112  allows the air in the bulb  102  to exit the bulb through the tip of the tapered head  112  when the bulb  102  is squeezed. An air flow controller  116  inside the base  110  blocks the moisture-containing air in the ear canal from returning to the bulb  102  and allows fresh air to enter the bulb  102  through the air intake controller  106  for continued application. The head  112  may have external air flow directors to provide exit routes for air in the ear canal. In a preferred embodiment, the air intake controller  106  and air flow controller  116  are valves, and most preferably ball-check valves.  
         [0018]    With reference now to FIGS. 2A, 2B and  2 C, an embodiment of the speculum  104  is illustrated in more detail. In this embodiment, the exterior of the head  112  of the speculum  104  has multiple external air flow directors in the shape of grooves  130 . Each groove  130  starts as a narrow trough at the tip of the head  112 , then extends and expands to the other end of the head  112 . As shown in FIGS. 2A and 2C, the groove  130  may have through-holes  132  at the expanded end to facilitate air release from the ear canal. As will be realized by one skilled in the art, the number and shape of the groove  130  is not critical to the invention, so long as the air inside the ear canal can be released effectively through the groove  130 . The speculum  104  of the present invention can be made of plastics, ceramics, metal, or any other solid material. The speculum  104  can be manufactured by any molding, casting, press-forming or any other suitable method known in the art. In one embodiment, the speculum  104  is manufactured by injection molding using a tooling die fabricated to the required specifications.  
         [0019]    [0019]FIG. 2C, a cross sectional view (I-II) of FIG. 2B, depicts an embodiment of the air flow controller  116 . The air flow controller  116  has a precision ball bearing  120  followed by a tubular soft rubber insert  122 . The rubber insert  122  is sized for a snug fit to the air passageway  114  within the base  110 , as is understood in the art. The rubber insert  122  also has a through-hole  124  sized to pass sufficient air and has a proper length to provide a seat for the ball bearing  120 . When the bulb  102  is squeezed, the air in side the bulb  102  pushes the ball bearing  120  away from the insert  122  and forms an air stream that is directed to the ear canal by the air passageway  114  within the speculum  104 . When the pressure on bulb  102  is released, the bulb  102  expands and creates a low pressure zone inside the bulb. The ball bearing  120  would then be pushed towards the rubber insert  122  and blocks the air passageway  114 . The fresh air may only enter the bulb  102  through the air intake controller  106 . Therefore, the assembly of the base  110 , the rubber insert  122 , and the precision ball bearing  120  forms a ball-check valve that prevents the moisture-laden air in the ear canal from returning to the bulb  102 .  
         [0020]    The ear canal dryer of the present invention is easy to use. A user may simply insert the tip of the speculum  104  into the ear opening and squeeze the bulb  102 . The compression of the bulb  102  will cause a unidirectional air stream to penetrate the ear canal thereby forcing moisture-laden air in the canal to be ejected across the surface of the speculum. The air flow controller  116  inside the speculum  104  prevents the moisture-containing air from returning to the bulb, and the grooves  130  on the exterior of the speculum  104  would facilitate the release of the moisture-laden air from the through-holes  132 .  
         [0021]    In the embodiment wherein the bulb  102  is a standard two ounce bulb, the bulb would have a volume of 29.57 cm 3 . Since the average volume of an adult ear canal is about 2 cm 3 , every squeeze of the bulb  102  would produce a gentle flow of air equal to approximately fifteen air changes in the ear canal. The drying effect is very noticeable as the user can feel the air temperature inside ear canal changing form cool (indicating liquid evaporation) to warm (indicating no evaporation). The user can usually stop the drying process when no temperature change is felt (indicating that all liquid has evaporated). The drying process normally takes 5-20 bulb squeezes.  
         [0022]    Swimmers can use the ear canal dryer of the present invention to blow out the water entrapped in the ear. When water is entrapped from swimming, the surface tension of the fluid in the ear makes it difficult to relieve the condition. The customary treatment is to lower the head to the side of the affected ear, and then proceed to hop on one leg and beat the side of the tilted head with the palm of one&#39;s hand until the surface tension is broken, thus freeing the flow of water out of the ear. The ear canal dryer will generally remove all water in the ear canal with one squeeze of the bulb.  
         [0023]    The ear canal dryer of the present invention is very useful for hearing aid users. The wet ear problems in hearing aid users are exacerbated due to the device being inserted in the ear for long periods of time. The ear canal dryer of the present invention is easy to carry and may be used periodically to remove moisture in the ear of the hearing aid users.  
         [0024]    The ear canal dryer of the present invention can also be used for pets that are afflicted with the same problems as human beings. For example, dogs with floppy ears that cover the ear opening all the time often develop wet-ear problem that can be prevented by applying the ear canal dryer of the present invention on a daily basis.  
         [0025]    Having described the preferred embodiments of a novel device and method for removing moisture from outer ear canal (which are intended to be illustrative and not limiting), applicant notes that modifications and variations can be made by persons skilled in the art in light of the above teachings. Therefore, it is understood that changes may be made in the particular embodiments disclosed which are within the scope and spirit of what is described as defined by the appended claims.