Viscous liquid applicator

Abstract: A viscous liquid applicator which comprises a cylindrical container containing a viscous liquid therein, an applying member (6) fitted in the distal end portion of the container (2) in such a manner that it is capable of reciprocally moving in the axial direction of the container (2). A space (7) is formed between the inner surface of the distal portion of the container (2) and the outer surface of the applying member (6). The viscous liquid can be taken out of the container by pressing it to pass through the space (7) thus adhering the applying material on the outer surface of the applying member (6) as the applying member (6) is moved into the container. The applying member (6) may be provided on its outer surface thereof with a groove or grooves through which the applying material can be taken out of the container (2).

Description: This invention relates to a viscous liquid applicator for applying a viscous liquid such as an ointment or cream onto a portion of a living body. The liquid applicator is widely employed in various fields of industries. In the medical industry, the liquid applicator is employed for applying a medical liquid onto a diseased portion of the body. Many types of applicator for medical purpose have been developed. For example, an applicator which is easy to handle and sanitarily safe has been recently developed as disclosed for example in Japanese Patent Unexamined Publication No. 63-181776 or PCT/JP88/01234 (WO-A-8905695). These applicator comprises a container which can be opened by being broken and a applying member impregnated with a medical liquid. When this applicator is to be used, the container is first broken thus forming an opening and thereby exposing a portion of the applying member, and contacting the exposed portion of the applying member to a diseased portion to coat the medical liquid. Meanwhile, in the treatment of for example dermatitis such as pimple, rash, external wound, and insect bite, a viscous liquid or semi-liquid such as ointment or cream (hereinafter referred to as a viscous material) is often employed. In the employment of such a viscous material, the viscous material is extruded by pressing a tubular container, and then the extruded material is coated onto the diseased part with the tip of finger. However, when the viscous material is coated in this way, it will give rise to various problems such as unpleasant feelings due to the adhesion of the viscous material to the tip of finger, the remainder of the viscous material being left on the tip of the finger, or due to the stickiness or bad smelling of the viscous material, a troublesome cleaning of the tip of the finger, or the contamination of the diseased portion through the germs which have been stuck on the tip of the finger. Accordingly, it is desirable to use a liquid applicator in the applying of such a viscous material as mentioned above. However, the conventional liquid applicator is generally constructed for applying a liquid material which is relatively low in viscosity. Therefore, the applying member has been made from a material having minute pores for allowing the impregnation of the liquid therein, such as non-woven fabric, or a bundle of fibers. However, it is almost impossible for a viscous material to impregnate into such a applying member. Even if the viscous material can be impregnated into the applying member, a desired amount of the liquid can be hardly extruded out of the applying member unless a high pressure is applied to the liquid due to the generation of a high fluid resistance within the applying member of the viscous liquid. Accordingly, it is almost impossible to apply the conventional liquid applicator to a viscous liquid as it is, so that the development of a new liquid applicator which is suitable for applying a viscous liquid has been demanded. Therefore, one of the objects of this invention is to provide a viscous liquid applicator which is suited for applying a viscous liquid, easy to handle, and highly hygienic. As claimed the viscous liquid applicator comprises a cylindrical container having a closed bottom, and comprising an applying material-filling portion and coater-supporting portion; an applying material consisting of viscous liquid or semi-liquid filled in said applying material-filling portion; an applying member fitted in said supporting portion so as to be movable in the axial direction of said cylindrical container; and a fluid passage for the applying material. According to the invention, said applying member is inserted in the cavity of the coater-supporting portion, and said fluid passage for the applying material is formed between the outer surface of the applying member and an inner surface of the coater-supporting portion and said applying member is provided with a communicating passage which allows the applying material-filling portion to communicate with an exterior of said container and to restore the pressure within the applying material-filling portion. According to an embodiment of the invention, the applying member is cylindrical in configuration, and comprises a barrier wall formed across an intermediate or end portion of the internal cavity of the applying member, and said communicating passage comprises at least one through hole formed in the barrier wall. An elastic member may be disposed in said applying material-filling portion so as to energize said applying member to a direction opposite to said applying material-filling portion. The viscous liquid applicator may further comprise a cap covering at least a portion of said applying member, and connected via a thin portion to said coater-supporting portion; one end of said cap which is opposite to said thin portion being formed into a shape capable of capping said coater-supporting portion. According to the viscous liquid applicator of this invention, when the applying member is pushed toward the applying material-filling portion while closing its passage thereby increasing the pressure within the applying material-filling portion, the viscous or semi-liquid applying material within the applying material-filling portion is extruded outward, or toward a fluid passage or groove formed between the outer surface of the applying member and the inner surface of the coater-supporting portion. The applying material thus extruded passes through the fluid passage or the groove, and finally sticks on the side surface of the distal end portion of the applying member. When the applying member is allowed to set back to the original position, the distal end portion of the applying member is extruded out of the supporting portion. Therefore the applying material stuck on this exposed portion of the applying member can be easily coated onto an object to be coated. If a spring which is adapted to energize the applying member to move to a direction opposite to the applying material-filling portion is built in the container, the applying member can be automatically set back to the original position. As the applying member returns to its original position, the external air is introduced through the passage formed in the applying member into the applying material-filling portion, thus restoring the original pressure within the applying material-filling portion to prepare for the next extrusion of the applying material by the movement of the applying member as mentioned above. This invention can be more fully understood from the following detailed description when taken in conjunction with the accompanying drawings, in which: Fig. 1 is a sectional view of the viscous liquid applicator according to this invention; Fig. 2 is a sectional view of the viscous liquid applicator which has been unsealed; Figs. 3, 4 and 5 respectively show another embodiment of the applying member according to this invention; and Fig. 6 is a sectional view explaining the application of the viscous liquid applicator after it is unsealed. This invention will be further explained with reference to the drawing depicting preferred embodiments. Fig. 1 shows a vertical sectional view of a viscous liquid applicator of this invention. As shown in this Fig. 1, the applicator 1 comprises a cylindrical container 2 having a closed bottom. This container 2 is a hollow cylinder closed at one end, and comprises a main body 3 and a cap 4. The main body 3 supports the applying member 6. The cap 4 surrounds at least one portion of the applying member 6. The main body 3 and the cap 4 are connected together by a thin-walled portion 5 which can be broken by hands. The main body 3 is cylindrical in configuration, and comprises a applying material-filling portion 30 at the proximal end side thereof (left side in Fig. 1), and a coater-supporting portion 33 at the distal end side thereof (right side in Fig. 1). An opening 31 is formed at the proximal end of the applying material-filling portion 30, and a bottom cap 32 is inserted into this opening 31 for hermetically sealing the opening 31. The coater-supporting portion 33 has a cavity therein, into which the applying member 6 is inserted and supported therein in such a manner that the applying member 6 is free to move (or slide) in the axial direction of the container 2. The cap 4 is also cylindrical in configuration as that of the main body 3, and is provided with a barrier wall 41 in traverse to its inner passage. When the container 2 is in an unsealed state as shown in Fig. 1, the cap 4 covers the exposed portion 61 of the applying member 6. Between the distal end of the main body 3 and the proximal end of the cap 4 is formed a thin-walled portion 5. In the embodiment shown in the Fig. 1, the thin-walled portion 5 is formed circumferentially around the container 2 in the form of V-shaped groove. When using the applicator 1, the thin-walled portion 5 is broken to separate the cap 4 from the main body 3. It is preferable to dispose the thin-walled portion 5 at a position which corresponds to the outer circumference of the applying member 6 as will be explained below. In the followings, the applying member will be explained in more detail. Figs. 3 to 5 show sectional views of various examples of the applying member 6. As shown in Fig. 3, the applying member 6 is cylindrical, in particular, having circular cross-section, and provided at the distal end of its inner cavity 62 with a barrier wall 63, in which at least one through hole 65 is formed. The presence of these inner cavity 62 and through hole 65 provides a passage for communicating the applying material-filling portion 30 with the distal end of the applying member 6. On the outer circumference of the proximal end of the applying member 6 is formed a circular rib 66 which is adapted to be engaged with the inner proximal end of the supporting portion 33. In other words, due to the presence of this rib 66, the applying member 6 is prevented from being detached from the main body 3. In the case of applying member 6a shown in Fig. 4, the position of the barrier wall in relative to the applying member is somewhat changed. That is, in the case of applying member 6a, the barrier wall 64 is formed at an intermediate portion of the inner cavity 62. As in the case of previous embodiment, at least one through hole 65 is formed in the barrier wall 64. Since the barrier wall 64 is located at an intermediate portion of the inner cavity 62 in the case of the applying member 6a, the distal end portion (an exposed portion 61 as explained hereinafter) of the applying member 6 can be easily deformed. Therefore, the applying material 8 can be easily applied to the skin of human body and the touching feeling of the applying member 6a to the skin is excellent. The applying member 6b shown in Fig. 5 has almost the same construction as that of the applying member 6 shown in Fig. 3 except that a groove (or grooves) 67 extending in the axial direction of the applying member 6b is formed on the outer circumferential wall. This groove 67 constitutes a passage for allowing the applying material 8 within the applying material-filling portion 30 to extrude out of the applying material-filling portion 30. The number of the groove 67 may be only one. However it may be more preferable that a plurality of grooves 67 are formed on the applying member 6 as being suitably or equidistantly spaced apart from each other. The shape or pattern of the groove (or grooves) 67 can be suitably selected. For example, the groove 67 may be formed helically on the outer surface of the applying member 6. In the embodiments shown in Figs. 3 to 5, only single through hole 65 is formed in the barrier wall. However, a plurality of through holes 65 may be formed in the barrier wall 63 or 64. The materials for the applying members 6, 6a and 6b should be preferably selected from those which are inert to the applying material 8. For example, polypropylene, polyethylene, polyvinyl chloride, polyethylene terephthalate, polystyrene, polycarbonate, acrylic resin, ABS resin, silicone resin, thermoplastic elastomer, olefin copolymer, natural rubber, isoprene rubber, silicone rubber, styrene rubber, nitrile rubber, butyl rubber, glass, ceramics such as alumina and metals such as stainless steel or aluminum can be employed. Among these, polypropylene, polyethylene, polyvinyl chloride and polystyrene are more preferable in view of easiness in manufacturing and manufacturing cost. When the feeling of the touch to the skin of the applying materials is taken as being important, the employment of elastic materials such as various rubber, silicone resin and thermoplastic elastomer are preferable. As to the size of the applying members 6, 6a and 6b, there is any particular limitation. However, those having an outer diameter of 1 to 50 mm, more preferably 5.0 to 25 mm, an inner diameter of 0.5 to 49 mm, more preferably 4.0 to 24 mm, and a length (length in the axial direction of the container) of 5 to 30 mm, more preferably 10 to 30 mm may be generally employed. The area of the opening of the through hole 65 should preferably be 0.5 to 10 mm², more preferably 0.5 to 1 mm². The applying members 6, 6a and 6b (hereinafter simply referred to as the applying members 6) are disposed within the supporting portion 33. In this case, a space is formed between the outer surface of the applying member 6 and the inner surface of the supporting portion 33, thus forming a fluid passage 7 for the applying material 8. It is preferable that the distance between the outer surface of the applying member 6 and the inner surface of the supporting portion 33 (or a half of the difference in diameter between the inner diameter of the supporting portion 33 and the outer diameter of the applying member 6) be set to 2 mm or less, more preferably 0.5 to 1.5 mm. When the applying member 6b is employed, the distance between the outer surface of the applying member 6 and the inner surface of the supporting portion 33 may be less than 0.5 mm, since the groove functions as a passage for allowing the applying material 8 to pass therethrough. Another groove (not shown) may be formed in the inner surface of the supporting portion 33 in the same manner as that of the groove 67 thereby obtaining almost the same effect as that of the groove 67. The applying material 8 is filled in applying material-filling portion 30 of the main body 3 as shown in Figs. 1 and 2. This applying material 8 is of relatively high viscosity or semi-liquid (fluid materials). Namely, the viscosity of the applying material 8 may preferably be 30 to 5000 cp, generally 1000 to 3500 cp at the normal temperature. There is substantially no restriction as to the liquid 8 to be employed in this invention. Any of medical or non-medical materials can be employed. Among medical liquids which may be employed are: an ointment containing medicine, cream and lotion. Among non-medical liquids which may be employed are: cosmetics, such as manicure, skin cream, lotion, eyeliner, liquid or semi-liquid powder, perfume, milky lotion, pomade, stick pomade, hair lotion, and hair dye; liquids for use in offices, such as glue, adhesives, correction liquid and water colors; foods or cooking materials such as bean paste, cooking oil lard, margarine, agar and gelatin; liquid for industrial use, such as lubricant, anticorrosives, wax, detergent, paint, glue, adhesives such as vanish, sealant and liquid resins. The applying material 8 can be filled in the container 2 in any amount desired. Preferably, it is filled in an amount ranging from 0.1 to 5 mℓ, more preferably from 0.3 to 0.8 mℓ. As is evident from in Fig. 1, it is desirable that the applying member 6, is biased toward the cap, or to the right in Fig. 1, by a resilient member. In this regard, a coil spring 9 is contacted or connected at its end to the inner surface of the bottom cap 32 and at the other end to the proximal end of the member 6. The distal end of the coil spring 9 is connected to the proximal end of the applying member 6. The coil spring 9 can be replaced by a leaf spring or any other resilient member. Until the container 2 is broken at the thin wall portion 5 as shown in Fig. 1, the coil spring 9 is expanded or somewhat compressed, pushing the applying member 6 toward the cap 4, with the rib 66 of the applying member 6 being hooked at the inner side of the proximal end of the supporting portion 33. When the container 2 is broken at the thin wall portion 5, whereby separating the main body 3 and the cap 4 from each other, the distal end portion 61 of the applying member 6 is exposed. Thereafter, the side surface of the applying member 6 is placed in contact with the prescribed portion (hereinafter referred to as a applying portion) to be applied with the applying material, and then the applying material 8 is coated thereon. When the applying material 8 is to be applied to, the distal end surface of the applying member 6 is contacted to the applying portion with the through hole 65 being sealed (in the case of the applying member 6a, the distal open end is sealed), and the exposed portion 61 is pressed toward the main body 3 against the elasticity of the spring 9. As a result, the spring 9 is constricted and the applying member 6 is shifted inward thereby increasing the pressure within the applying material-filling portion 30 and to cause the applying material 8 to be extruded through the passage 7 from the proximal end of the applying member 6 to the side surface of the exposed portion 61. In the case of the applying member 6b, the applying material 8 can be extruded through the groove 67 to the side surface of the exposed portion 61. When the applying member 6 is released from the pushing force, the coil spring 9 expands to its original length, thus moving the member 6 to the initial position. At this occasion, an outer air is introduced into the applying material-filling portion 30 through the through hole 65 and the inner cavity 62, thereby restoring the pressure within the applying material-filling portion 30 to the original state thus making it possible to allow another extrusion of the applying material 8. The container 2 and the bottom cap 32 should better be made of material which is inert to the applying material 8 and which can form a gas barrier for preventing, to some extent, the applying material 8 from evaporating. They can be made of various resins including polypropylene, polyethylene, polyvinyl chloride, polyvinylidene chloride, polyethylene terephthalate, polystyrene, polycarbonate, acrylic resin, ABS resin, silicone resin. Alternatively, they can be made of various ceramics such as glass and alumina, or various metals such as stainless steel and aluminum. Of these materials, the most preferable are polypropylene, polyethylene, polyvinyl chloride, and polystyrene. This is because, the container 2, if made of one of these resins, can easily be broken at the thin wall portion 5, and the container 2 and the bottom cap 32, if made of one of these resins, can be easily manufactured at low cost. The main body 3 and the cap 4 can be separately prepared and then connected together by fusing or bonding, thereby forming the integral container 2. To reduce the number of components of the applicator 1, however, it is more recommendable that the main body 3 and the cap 4 be formed integral, made of the same material or multi-color formed with different materials such as two colored formation. The coil spring 9 should also better be made of material which is inert to the applying material 8. To be more specific, it is desirable that the spring 9 be made of various resins such as polypropylene, polyethylene, polyvinyl chloride, polyethylene telephthalate, polystyrene, polycarbonate, acrylic resin, ABS resin and silicone, or various metals such as stainless steel, aluminum and titanium. In the embodiment shown in Fig. 1, the coil spring 9 is not integral with the bottom cap 32. However, it may be preferably formed in integral with the bottom cap 32, thereby to reduce the number of components constituting the applicator 1. In this case, the spring 9 and the bottom cap 32 can be made of either the same material or two different materials. Preferably, the liquid applicator 1 is a disposable one, which is thrown away after being used once or a few times. If the applicator 1 is of the type to be thrown away after being used a few times, the applying member 6 should not be left exposed between uses, so that it may not contaminated or may not let the applying material evaporate. This is why the distal open end portion 42 of the cap 4 is so shaped and sized as to hold, preferably in airtight fashion, the supporting portion 33 of the main body 3 as is shown in Fig. 6. The present invention is not limited to the viscous liquid applicator shown in Figs. 1 to 6. Rather, various changes and modifications can be made. For instance, the container 2 may comprise a main body and a cap fitted at one end in the main body or connected thereto in screw engagement. Further, the coil spring 9 can be dispensed with, and the applying member 6 may be made movable by providing it secured to the supporting portion 33 through an engagement, as in the case of, for example, a lipstick wherein the reciprocal movement of the applying member 6 can be realized through the rotation thereof. The use of the liquid applicator according to the invention is not necessarily limited. The applicator can find uses in medical treatment, in offices, in food-processing, in cooking, and in manufacturing products. According to the applicator of this invention, it has become possible to coat viscous or semi-liquid materials with easiness without touching the tip of finger to the applying material or applying portion, thereby avoiding finger tip as well as the applying portion from being spoiled. The shape of the cylindrical container 2 according to this invention is not limited to those having a circular cross-section, but may be those having a square cross-section or another polygonal cross-section.

Claims: A viscous liquid applicator comprising : a cylindrical container (2) having a closed bottom, and comprising an applying material-filling portion (30) and coater-supporting portion (33); an applying material consisting of viscous liquid or semi-liquid filled in said applying material-filling portion (30); an applying member (6, 6a, 6b) fitted in said supporting portion (33) so as to be movable in the axial direction of said cylindrical container (2); and a fluid passage for the applying material, characterized in that said applying member (6, 6a, 6b) is inserted in the cavity of the coater-supporting portion (33), and said fluid passage (7) for the applying material is formed between the outer surface of the applying member (6, 6a, 6b) and an inner surface of the coater-supporting portion (33) and that the applying member is provided with a communicating passage (65) which allows the applying material-filling portion (30) to communicate with an exterior of said container (2) and to restore the pressure within the applying material-filling portion. A viscous liquid applicator according to claim 1, characterized in that the applying member (6, 6a, 6b) is cylindrical in configuration, and comprises a barrier wall (63, 64) formed across an intermediate or end portion of the internal cavity of the applying member (6, 6a, 6b), and said communicating passage comprises at least one through hole (65) formed in the barrier wall (63, 64). A viscous liquid applicator according to claim 2, characterized in that said fluid passage comprises at least one groove (67) provided around the circumference of said applying member (6, 6a, 6b) and extending along the lenght of the applying member (6, 6a, 6b). A viscous liquid applicator according to claim 1, characterized in that an elastic member (9) is disposed in said applying material-filling portion (30) so as to energize said applying member (6, 6a, 6b) to a direction opposite to said applying material-filling portion (30). A viscous liquid applicator according to claim 4, characterized in that said elastic member (9) is in a form of a coil spring. A viscous liquid applicator according to claim 1, characterized by further comprising a cap covering at least a portion of said applying member (6, 6a, 6b), and connected via a thin-walled portion (5) to said coater-supporting portion; one end of said cap (4) which is disposed opposite to said thin-walled portion being formed into a shape capable of capping said coater-supporting portion (33).

Inventors: HIROSE KAZUNORI C O TERUMO KAB, HIROSE, KAZUNORI, C/O TERUMO KABUSHIKI KAISHA
Applicants: TERUMO CORP, TERUMO KABUSHIKI KAISHA
Application year: 1991
Main classification: A61M35
IPC codes: A61M35, A45D34, B05C17