JP2008119519A - Filter for prevention of filler outflow and absorber equipped with the filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve issues of conventional filters for prevention of filler outflow that liquid leaks out between a filter and a liquid port when packing is not used, the number of parts constituting an absorber is increased and moreover when packing is used, packing has possibility of slipping off in joining a housing with a liquid port by welding when wall thickness of the housing and ring parts of a filter is thin, and, furthermore, a gap is formed between the filter and the housing cross section or the liquid port inner surface causing liquid to leak into the gap between the filter and the liquid port even when packing is used, body fluid leaks out between the filter and the liquid port when the filter is used as a medical absorber and the body fluid is left after treatment in the gap between the filter and the housing end surface or liquid port inner surface to harm impression of appearance. <P>SOLUTION: A filler outflow prevention filter with a structure body comprising soft resin with elasticity is fixed to a housing in a condition the filter is interposed and pressed between the inner surface of a liquid port and the end surface of the housing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  According to the present invention, an adsorbent is filled between a packing and an outflow prevention filter provided on the inflow side and the outflow side, or the outflow side only, preferably the inflow side and the outflow side, and a liquid port having a housing and a liquid inflow / outflow port. It relates to an adsorber. In particular, the present invention relates to a medical adsorber for use in medical applications.

  The adsorber has a housing and a liquid port having a liquid inflow / outlet at both ends of the housing, and between the housing and the inflow side and the outflow side or outflow side liquid port in order to fill / hold the adsorbent in the housing. Has a filler outflow prevention filter (hereinafter referred to as a filter). The housing and the liquid port are joined by ultrasonic welding, high frequency welding or the like, and the filter is inserted into the liquid port and pressed and fixed by the housing and the liquid port. The filter used here is composed of a cloth-like mesh portion for holding the adsorbent in the housing and a ring portion for reinforcing the mesh portion. The housing and the liquid port are formed of a hard resin such as polycarbonate, polypropylene, polystyrene, and the filter ring is also formed of a hard resin such as polycarbonate, polypropylene, polystyrene, or the like. For this reason, if there is a slight gap between the filter and the housing or the liquid port, liquid leaks between the filter and the liquid port during use of the adsorber, and after use of the adsorber, between the filter side and the liquid port. Liquid will remain in Until now, in order to solve this problem, a thin packing made of silicon rubber or the like was inserted between the filter and the housing and between the filter and the liquid port, and this packing was sandwiched between the filter end surface, the housing end surface and the liquid port inner surface. To prevent leakage of liquid between the filter and the liquid port.

  In the conventional method, when the packing is not used, the liquid leaks between the filter and the liquid port. When the packing is used, the number of parts constituting the adsorber is increased, and the ring portion of the housing or filter is used. If the wall thickness is small, the packing may be displaced when the housing and the liquid port are joined by welding or the like. Furthermore, if there are scratches or irregularities due to molding on the housing end surface, the liquid port inner surface, and the contact surface with the filter, the housing end surface or the liquid port inner surface cannot be pressed evenly. A gap is generated between the end face of the housing or the inner surface of the liquid port, and the liquid flows into the gap between the filter and the liquid port. In the case of an adsorber used for sanitary purposes, if such a gap exists, it will cause adverse effects such as sacrificing the product, making it a place where bacteria can propagate and where it cannot be washed, Furthermore, when this adsorber is used for medical purposes, that is, when used as a medical adsorber, body fluid leaks between the filter and the liquid port during use of the medical adsorber, and after treatment, the filter and housing Body fluid remains in the gaps between the end surfaces or the inner surfaces of the liquid ports, and the appearance impression is impaired.

  Therefore, the present invention eliminates the path and gap where the liquid goes around the filter side face without increasing the number of parts constituting the adsorber in the adsorber filled with the adsorbent between the housing and the filter inserted in the liquid port. Another object of the present invention is to provide an adsorber in which liquid does not leak into the gap between the filter and the side surface of the liquid port.

  What achieves the above object is a housing, an adsorbent composed of a large number of adsorbents filled in the housing, an inflow side liquid port having a liquid inlet attached to one end of the housing, An adsorber having an outflow side liquid port having a liquid outflow port attached to an end of the other housing, the adsorber having a mesh portion for holding the adsorbent in the housing and an elastic soft resin portion A filter composed of a body is an adsorber fixed between the inner surface of the liquid port and the end surface of the housing in a state where the filter is sandwiched between the inner surface of the liquid port and the end surface of the housing.

  By providing the filter at the inflow side and the outflow side or the outflow side liquid port, the adsorbent can be filled / held in the housing. The filter has a cloth-like mesh part for holding the adsorbent in the housing and a ring part for reinforcing the peripheral part of the mesh part, and the ring part is only a soft resin having elasticity. Alternatively, only the portion that contacts the housing and the inner surface of the liquid port is formed of a soft resin having elasticity, that is, reinforcing the peripheral portion of the mesh portion as a hard material and covering the surface of the hard material with a soft resin having elasticity.

  The medical adsorber according to the present invention includes a housing, an adsorbent filled in the housing, a liquid inflow port and a liquid outflow port respectively provided at both ends of the housing, and the adsorbent filled in the housing. An adsorber having a packing outflow prevention filter for holding, wherein the liquid port includes a ring portion of the packing outflow prevention filter between an inner surface of the liquid inflow / outflow port and an end surface of the housing. Since it is fixed between the inner surface of the liquid port and the end surface of the housing in the clamped state, the housing end surface, the inner surface of the liquid filling outflow prevention port, and the contact surface with the filling outflow prevention filter are not damaged. Even if there are irregularities due to molding or there are minute foreign objects on the contact surface with the packing outflow prevention filter, the liquid inflow / outflow port and the packing outflow prevention filter There is no leaking of liquid in the gap of data.

  The adsorber of the present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 is a cross-sectional view of an embodiment of an adsorber of the present invention, and FIG. 2 is a partially enlarged cross section showing a state in which a liquid port equipped with a hard resin filter is attached to a housing in an embodiment of a conventional adsorber. FIG. 3 is a partially enlarged cross-sectional view showing a state in which a liquid port fitted with a soft resin filter in one embodiment of the adsorber of the present invention is attached to a housing.

  As shown in FIG. 1, the adsorber of this embodiment includes a housing, an adsorbent composed of a large number of adsorbents filled in the housing, and a liquid inlet port attached to one end of the housing. An adsorber having an inflow side liquid port and an outflow side liquid port having a liquid outflow port attached to the other end of the housing, the adsorber having a mesh portion for holding the adsorbent in the housing and elasticity A filter composed of a structure having a soft resin portion is fixed between the inner surface of the liquid port and the end surface of the housing in a state of being sandwiched between the inner surface of the liquid port and the end surface of the housing. Adsorber.

  By providing the filter at the inflow side and the outflow side or the outflow side liquid port, the adsorbent can be filled / held in the housing. The filter has a cloth-like mesh part for holding the adsorbent in the housing and a ring part for reinforcing the peripheral part of the mesh part, and the ring part is only a soft resin having elasticity. Alternatively, only the portion that contacts the housing and the liquid port inner surface is formed of a soft resin having elasticity, that is, the reinforcement of the peripheral portion of the mesh portion is made of a hard material and the surface of the hard material is covered with a soft resin having elasticity. Each configuration will be described below.

  The housing of the adsorber of this embodiment is formed into a cylindrical body, and a liquid processing adsorbent is accommodated in a space formed by the filter and the housing. Further, the adsorbent is filled in the housing in a liquid-tight manner.

  The housing is formed of a thermoplastic resin such as polycarbonate or polystyrene, a polyolefin such as polypropylene or polyethylene, and is preferably a cylinder or a cylinder having a circular cross section from the viewpoint of uniform flow in the adsorber. A cylindrical shape is preferable.

  The adsorbent for liquid processing can be used without any special restrictions on the shape and size regardless of the material, but this adsorber is used for medical purposes, that is, in the case of a medical adsorber, the material is medical. As long as it can be used as a material, it can be used without any particular limitation, and any shape and size can be used as long as it can be stored in the housing. However, in consideration of liquid permeability, the particle size is preferably 10 μm to 2 mm. In particular, a spherical shape and a particle size of 10 to 600 μm are more preferable.

  In addition, the liquid filled with the adsorbent in the housing can be used without any special restrictions on its properties, composition, etc. as long as it matches the characteristics of the adsorbent. In other words, in the case of a medical adsorber, a liquid that is harmless to a living body (for example, physiological saline or sterile water) can be used.

  Liquid ports are joined to both ends of the housing by welding or the like. Specifically, as shown in FIGS. 2 and 3, the liquid port has a joint portion with the housing, and the joint portion is fused and fixed to the housing by high frequency, ultrasonic waves, or the like.

  The liquid port is formed of a thermoplastic resin such as polycarbonate or polystyrene, or a polyolefin such as polypropylene or polyethylene.

  The elastic soft material, which is a characteristic of the material forming the ring part constituting the filter of the present invention, is deformed with repulsive force along the shape of the pressed object and restored to the original shape when released. The material having a hardness of about JIS-A 60 to 100 degrees is preferable in order to make the ring portion rigid with only a single material as the hardness of the resin according to JIS K 6301. . In addition, a material selected from silicon rubber, polyurethane rubber, isoprene rubber, vulcanized rubber, butadiene rubber, ethylene-propylene rubber, polyolefin elastomer, styrenic elastomer, etc. is used as an elastic soft material used for the ring portion. it can. Of these materials, polyolefin elastomers, styrene elastomers, and silicon rubber are preferable.

  Furthermore, when further rigidity is required by the filter, a structure may be adopted in which the material constitutes the ring portion surface. That is, only the portion that contacts the inner surface of the liquid port and the end surface of the housing is formed of an elastic soft resin, and a hard material can be used for the portion that reinforces the peripheral portion of the mesh portion. As the hard material used here, the material composition can be used without any particular limitation as long as the material hardness is higher than that of the soft resin having elasticity used for the ring portion surface. Further, a thermoplastic resin such as polystyrene, a hard resin such as polyolefin such as polypropylene or polyethylene, a metal, ceramic, or the like can be used. More preferred are thermoplastic resins such as polycarbonate and polystyrene, and polyolefins such as polypropylene and polyethylene.

  Further, in order to suppress the deflection of the mesh part of the filter, a reinforcing part can also be provided on the surface (one side or both sides) of the mesh part. In this case, a material other than that used for the ring portion may be used for the reinforcing portion, and the reinforcing portion can be used without any special restriction such as a resin, a metal, or a composite thereof.

  The ring portion and the mesh portion are integrally formed. Even when a soft material having elasticity is used only on the surface of the ring portion, the soft resin having elasticity and the hard material are integrally formed. When a reinforcing material is provided on the surface of the mesh part, it is preferable that the ring part and the reinforcing material, or the mesh part and the reinforcing material are formed integrally, and the ring part, the mesh part and the reinforcing material are formed integrally. More preferred.

  The adsorber in the present invention has a soft resin having elasticity in the ring portion of the filter so that the liquid does not leak from the gap between the filter and the housing or the liquid port. Specifically, a filter made of an elastic soft resin is fixed between the inner surface of the liquid port and the end surface of the housing while being sandwiched between the inner surface of the liquid port and the end surface of the housing. . Therefore, no extra packing is required, and even if there are scratches or irregularities due to molding on the housing end surface, the liquid port inner surface, and the contact surface with the filter, the liquid does not leak into the gap between the filter and the liquid port. Furthermore, the ring portion of the filter is a main seal member that forms a liquid-tight state between the liquid port and the housing, and is an effective seal member even if the weld between the liquid port and the housing is insufficient.

  The fixed state of the housing and the liquid port will be described more specifically. Since the liquid ports 4 and 5 have the same shape on both the inflow side and the outflow side, the liquid ports will be described below.

  The adsorber has an annular recess at the inner peripheral edge of the liquid port. As shown in FIG. 3, the annular recess of the liquid port is formed by an outer side surface of an annular rib provided on the inner side of the liquid port, an inner side surface of the shoulder portion of the liquid port, and a bottom surface portion. And the ring part of a filter is assembled | attached to a liquid port by inserting one end in this annular recessed part. Thus, by forming the annular recess in the inner peripheral edge of the liquid port, it is possible to prevent the annular elastic member from shifting after attachment.

  Further, as shown in FIG. 3, the other end of the ring portion of the filter protrudes from the annular recess, and one end (end portion on the liquid port contact side) of the filter ring portion is in contact with the inner surface of the liquid port. The other end (housing contact side end) is in contact with the end surface of the housing. That is, the liquid port is fixed to the housing in a state where the ring portion of the filter is sandwiched between the inner surface of the liquid port and the end surface of the housing. As a result, even if there are scratches or irregularities on the contact surface of the housing end face, liquid port inner surface, and filter ring part, or there is minute foreign matter between the housing end face or liquid port inner face and the filter ring part, Even in such a case, the liquid can be prevented from leaking to the side surface of the ring portion of the filter. The cross-sectional shape of the ring portion of the filter is not limited to the rectangular shape shown in FIG. 3, but may be a circle, a semicircle, an ellipse, a substantially ellipse, a triangle, a trapezoid, or the like.

  In addition, the annular rib of the liquid port portion is preferably provided in order to obtain the effect of the present invention, but the effect of the present invention works effectively even when there is no annular rib.

  Furthermore, as one of the methods for making the effect of the present invention more effective, the ring portion is pressed by providing a slight protrusion as shown in FIG. 4 on both or one of the bottom of the annular recess and the end surface of the housing. Therefore, the leakage of liquid can be prevented more reliably.

  Next, a preferred embodiment when the filter of the present invention is used for an adsorber having an adsorber with an internal volume of 100 to 500 mL will be described using a specific example. The inner diameter of the ring portion of the filter is substantially equal to or slightly larger than the inner diameter of the housing end surface, and the outer diameter of the filter ring portion is substantially equal to or smaller than the outer diameter of the housing end surface. The housing dimensions can be used without any special restrictions depending on the characteristics of the resin used, but the barrel length is 50 to 200 mm, the housing inner diameter is 40 to 100 mm, and the wall thickness of the housing end surface is 2 to 5 mm. Is usually used. As a ring part, width is about 2-5 mm and height is about 3-10 mm. And the insertion position of a mesh part is the approximate center of a ring part.

  In order to fix the filter so as to be liquid-tight between the inner surface of the liquid port and the housing end surface, it is necessary to squeeze the ring part of the filter, and the length to be squeezed depends on the characteristics and hardness of the resin used. Although it can be used without any limitation, a thickness of about 0.1 to 0.5 mm is usually used at the time of non-clamping pressure.

  As described above, the liquid port is liquid-tightly fixed to the housing, whereby a liquid outflow chamber and an inflow chamber are formed between the inner surface of the liquid port and the mesh portion. In addition, although the filter of this Example is shape | molded separately from the liquid port and is attached to the inner surface of the liquid port after that, both may be integrally molded. Thereby, fixation with a filter and a liquid port becomes reliable, and it can prevent that a liquid leaks more.

  As a method for integrally molding, for example, first, the mesh portion and the ring portion of the filter are first integrally molded by injection, and the molded filter is inserted into a liquid port forming mold to form a liquid port. It is conceivable to use a so-called insert molding method in which a resin for injection is injection molded.

  And when this adsorption machine is used for a medical use, ie, in the case of a medical adsorption machine, this adsorption machine is sterilized before use. As sterilization, known methods such as ethylene oxide gas sterilization and autoclave sterilization are used. When autoclave sterilization is performed, the inside of the adsorber (adsorbent chamber and liquid chamber) is filled with a liquid that is harmless to the living body (for example, physiological saline and sterile water), and the openings (liquid inlet and outlet) are elastic. Sterilize by autoclave in a sealed state using the members.

It is sectional drawing of one Example of the medical adsorption device of this invention. It is a partial expanded sectional view which shows the state which attached to the housing the liquid port equipped with the filling outflow prevention filter in one Example of the conventional medical adsorption device. The ring portion of the filler outflow prevention filter is formed of a hard resin. It is a partial expanded sectional view which shows the state which attached the liquid port which mounted | wore with the filling outflow prevention filter in one Example of the medical adsorption device of this invention to the housing. The ring portion of the packing outflow prevention filter is formed of a soft resin. It is the elements on larger scale which show the projection part of the bottom part of the annular recessed part of a port part. It is a figure which shows the specific Example 1 of this invention. It is a figure which shows the specific Example 2 of this invention. It is a partial expanded sectional view which shows the ring part of the filler outflow prevention filter of this invention at the time of using a hard material for the part which reinforces a mesh part peripheral part, ie, 11 in FIG. 1, and 10 in FIG. In order to increase the rigidity of the filter, a soft resin is used on the surface of the ring portion, and a hard material is used on the inside thereof, so that the effect of the present invention is exhibited.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Medical adsorber 2 Housing 3 Adsorbent 4 Liquid port 5 Liquid port 6 Liquid inflow port 7 Liquid outflow port 8 Packing outflow prevention filter mesh part 9 Packing outflow prevention filter mesh part 10 Packing outflow prevention filter ring Part (soft resin)
11 Packing outflow prevention filter ring (soft resin)
12 Ring prevention filter (hard resin)
DESCRIPTION OF SYMBOLS 13 Annular rib 14 Protrusion part 15 Joint part 16 Hard material for reinforcement of mesh part peripheral part 17 Soft resin which has elasticity 18 Mesh part

Claims (7)

  A housing, an adsorbent filled in the housing, an inflow side liquid port having a liquid inflow port attached to one end of the housing, and a liquid outflow port attached to the other end of the housing Used in an adsorber having an outflow side liquid port having a cloth-like mesh portion and a ring portion for reinforcing the peripheral portion of the mesh portion, and the mesh portion and the ring portion are integrally formed, An inner surface of a liquid port made of a thermoplastic resin in which a filler outflow prevention filter made of a soft resin selected from a polyolefin elastomer or a styrene-based elastomer having an elastic ring portion is fused and fixed to a housing at the outer peripheral portion. The liquid port and the housing are sandwiched between a corner and an opening end surface of a housing made of a thermoplastic resin molded into a cylindrical shape. In a state so as to form a liquid-tight state with the ring, adsorber, characterized in that it is fixed to the housing.   A housing, an adsorbent filled in the housing, an inflow side liquid port having a liquid inflow port attached to one end of the housing, and a liquid outflow port attached to the other end of the housing Used in an adsorber having an outflow side liquid port having a cloth-like mesh portion and a ring portion for reinforcing the peripheral portion of the mesh portion, and the mesh portion and the ring portion are integrally formed, A filling outflow prevention filter is formed so that the ring portion covers a hard material and the surface of the hard material with a soft resin selected from a polyolefin elastomer having elasticity or a styrene-based elastomer. Inner corner of the inner surface of the liquid port made of a fixed thermoplastic resin and the open end of the housing made of a thermoplastic resin molded into a cylindrical shape Adsorber is clamped, in a state so as to form a liquid-tight state between the housing and the fluid port, characterized in that it is fixed to the housing between.   The adsorber according to claim 2, wherein the hard material has a material hardness higher than that of an elastic soft resin formed on a surface of the hard material.   The adsorber according to any one of claims 1 to 3, further comprising a reinforcing material for reinforcing the mesh portion on the surface of the cloth-shaped mesh portion.   The adsorber according to claim 4, wherein the mesh portion, the ring portion, and the reinforcing material are integrally formed.   The adsorbent is filled / held in the housing by providing the packing outflow prevention filter in the inflow side and the outflow side or outflow side liquid port. Adsorber. The medical adsorber according to any one of claims 1 to 6, wherein the liquid is a body fluid.

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