JPWO2014203340A1 - Subcutaneous implantable drug injector - Google Patents

Abstract

[Document Name] Abstract The subcutaneous implantable drug injector (1) is composed of a ring-shaped upper member (3) and a bottom member (2) for closing the bottom surface of the upper member (3), and an upper part A seal member (4) which is housed between the member (3) and the bottom member (2), closes the opening of the upper member (3), and forms a medicinal solution inflow space (10) in the injection tool body; A discharge port (5) communicating with the inflow space (10). The seal member (4) can be pierced multiple times with a needle for injecting a chemical solution, and the inner bottom surface (21a) of the injection tool body facing the seal member () 4 has antithrombogenicity and microbial adhesion suppression. A coating (62) is provided. Furthermore, the coating (62) is a non-solidified coating having a self-recovering property capable of recovering the damage caused by the needle for injecting the chemical liquid that has pierced the seal member (4) and contacted the inner bottom surface (21a) of the injection tool body.

Description

  The present invention relates to a drug solution injector for injecting a drug solution into a patient's body, and more particularly to a subcutaneously implantable drug solution injector used for treatment such as chemotherapy.

In the treatment of cancer and the like, a chemical solution injection therapy in which a chemical solution is injected into the body is performed. In order to use such a drug injection therapy, a subcutaneous implantable drug injector is used. As a chemical | medical solution injection tool, there exist patent document 1 (patent publication 2908503), patent document 2 (WO2009 / 35582), etc., for example.
These chemical injection devices include a main body composed of a ring-shaped upper member and a bottom member, and a seal member (septum) housed in the main body in a state where the peripheral edge is pressed between the upper member and the bottom member. An inner space for injecting medicine is formed by the lower surface of the seal member (septum) and the inner surface of the main body, and the main body is provided with a flow path for outflow of the chemical liquid communicating with this space. The seal member (septum) is a rubber stopper and can be punctured a plurality of times with a drug injection needle.

Patent No. 2908503 WO2009 / 35582

In the conventional implantable liquid injectors such as Patent Documents 1 and 2, the seal member (septum) is in a state where the peripheral edge is pressed and sandwiched between the upper member and the bottom member forming the main body. At the same time, the lower part of the septum penetrates into the bottom member. In the case of Patent Document 1, for example, a fluororesin is applied to the inner wall surface (inner peripheral surface 3a, bottom surface 3b) that restricts the internal space, the inner surface 10a of the lumen 10 or the like so that the high-viscosity chemical solution is difficult to adhere. Further, there is a disclosure that a surface treatment such as a surface smoothing treatment such as coating of silicon or the like or polishing can be performed.
However, as described above, in the implantable drug solution injector, the seal member (septum) has been punctured multiple times by the drug injection needle, and the tip of the injection needle that has pierced the septum is the bottom member facing the septum Abuts against the inner bottom surface. The blade tip of the injection needle that comes into contact may damage the coating coated on the inner bottom surface. In particular, since the injection needle is often pierced near the center of the septum, the damaged part is also concentrated near the center of the inner bottom surface of the bottom member. As a result, innumerable dot-like coatings disappear at the central portion of the inner bottom surface where the damaged portion concentrates, and a portion where the forming material of the inner bottom surface is exposed is formed. In this part, the present invention and the like have found that thrombus and the like and microorganisms adhere.

  An object of the present invention is to provide a subcutaneously implantable drug solution injection device (access port) in which thrombus formation due to contact marks formed by contact of an injection needle does not occur and adhesion of microorganisms is suppressed. is there.

What achieves the above object is as follows.
An injection device main body having an opening, and a chemical solution inflow space communicating with the opening; a discharge port attached to the injection device main body and communicating with the chemical solution inflow space; and sealing the opening of the injection device main body. A subcutaneously implantable drug solution injection tool including a seal member capable of being pierced with a drug solution injection needle, the seal member being capable of piercing the drug solution injection needle a plurality of times, and In addition, an antithrombogenic and microorganism adhesion suppressing coating is provided on the inner bottom surface of the injection device body facing the seal member, and the antithrombogenic and microorganism adhesion suppressing coating is inserted through the seal member, A subcutaneously implantable drug solution injector characterized by having a self-healing property capable of recovering damage caused by the drug solution injection needle abutted on the inner bottom surface of the injector body.

FIG. 1 is a perspective view of a chemical liquid injector of the present invention. FIG. 2 is a plan view of the chemical liquid injector of the present invention. FIG. 3 is a front view of the chemical solution injector shown in FIG. 4 is a cross-sectional view taken along line AA in FIG. 5 is a cross-sectional view taken along the line BB in FIG. FIG. 6 is a front view of a seal member (septum) used in the chemical liquid injector of the present invention. FIG. 7 is a bottom view of the sealing member shown in FIG. FIG. 8 is an enlarged sectional view taken along the line CC of FIG. FIG. 9 is a plan view of a bottom member used in the chemical liquid injector of the present invention. 10 is a cross-sectional view taken along the line DD of FIG. FIG. 11 is an explanatory diagram for explaining a state before the chemical liquid injector of the present invention is fixed. FIG. 12 is an enlarged view of only the seal member in the chemical liquid injector shown in FIG. FIG. 13 is an external view of the drug solution injector of the present invention with a catheter attached. FIG. 14 is a photograph showing the experimental results. FIG. 15 is a photograph showing the experimental results.

The subcutaneously implantable drug solution injector of the present invention will be described with reference to the illustrated embodiment.
The subcutaneous implantable drug solution injector 1 of the present invention is accommodated between an upper body 3 and a bottom member 2, an infusion tool body composed of a ring-shaped upper member 3 and a bottom member 2 that closes the bottom surface of the upper member 3, A seal member 4 that closes the opening of the upper member 3 and forms a chemical solution inflow space 10 in the injection tool main body, and a discharge port 5 that communicates with the chemical solution inflow space 10 are provided.
The seal member 4 can be pierced multiple times with a needle for injecting a chemical solution, and an antithrombogenic and microorganism adhesion suppression coating 62 is provided on the inner bottom surface 21a of the injection tool body facing the seal member 4. Yes. Furthermore, the antithrombogenic and microorganism adhesion suppressing coating 62 is a non-solidified coating having self-recovering properties that can recover damage caused by the needle for injecting a chemical liquid that is pierced through the seal member 4 and is in contact with the inner bottom surface 21a of the injection tool body. .

  As shown in FIGS. 1 to 5, the subcutaneous implantable drug solution injector 1 of this embodiment is composed of an injector main body and a seal member 4. And the injection tool main body was attached to the side part of the bottom member 2 which has the recessed part which forms the chemical | medical solution inflow space 10, the ring-shaped upper member 3 with which the upper surface side of the bottom member 2 is mounted | worn, and the bottom member 2 And a discharge port 5. The seal member 4 is disposed between the bottom member 2 and the upper member 3, and the flange portion 42 is clamped by the bottom member 2 and the upper member 3, so that the bottom member 2 and the upper member 3 are liquid-tight. It is sealed.

In this embodiment, the bottom member 2 includes a bottom plate portion 21, an annular wall portion 22 protruding from the bottom plate portion 21, and a seal member peripheral portion pressing portion 22 b formed by an outer edge side portion of the upper surface of the annular wall portion 22. And an annular edge portion 25 which is formed on the inner edge side portion of the upper surface of the annular wall portion 22, protrudes upward, has an annular inclined surface whose inner diameter expands upward, and can be inserted into the seal member 4. With.
Further, the ring-shaped upper member 3 protrudes inward from the main body 31 that houses the seal member 4 in a state where the central portion of the seal member 4 is exposed (protruded), and the opening of the main body 31. An annular protrusion 32 is provided to press the peripheral edge of the.
The seal member 4 is formed on the peripheral portion of the main body 41 and the flange 41 for being pressed by the lower surface of the annular protrusion 32 of the upper member 3 and the upper surface of the annular wall 22 of the bottom member. The bottom member internal insertion portion 41b is formed by a lower portion than the flange portion 42, and the skirt-shaped protrusion 43 is formed at the peripheral edge of the lower surface of the bottom member internal insertion portion 41b and becomes thinner toward the end portion.

The bottom form of the upper member in this embodiment is a semi-elliptical shape in which both sides of the base end swell as shown in FIGS. 2, 9 and 10, and the center of the top face is the bottom form. It is a circular shape according to the base end side.
As shown in FIGS. 3, 5, 9, and 10, the bottom member 2 includes a bottom plate portion 21, an annular wall portion 22 that protrudes from the bottom plate portion 21, and a rear end portion 23. The annular wall portion 22 is substantially cylindrical and includes a recess 26 for forming the chemical solution inflow space 10 therein. Further, the annular wall portion 22 includes a discharge port mounting portion 24 that communicates with the concave portion 26 at a lower portion of the side surface. The discharge port mounting portion 24 is a cylindrical portion that protrudes from the annular wall portion 22 of the bottom member 2, and includes a lumen portion into which the proximal end portion of the discharge port 5 can be inserted. As shown in FIG. 9, the bottom plate portion 21 has a semi-elliptical shape in which both sides of the base end are cut off, and the annular wall portion is provided at a position whose center is based on the base end side of the bottom surface form. ing.

  Further, in this embodiment, the bottom member 2 has a seal member peripheral portion pressing portion 22 b formed by an outer edge side portion of the upper surface of the annular wall portion 22. Further, an annular edge formed on an inner edge side portion (in other words, inside the seal member peripheral edge pressing portion 22b) of the upper surface of the annular wall portion 22 and having an annular inclined surface protruding upward and having an inner diameter expanding upward. The unit 25 is provided. The annular edge portion 25 can be inserted into the lower surface of the flange portion 42 of the seal member 4.

The inner bottom surface 21 a of the bottom plate portion 21 of the bottom member 2 (in other words, the inner bottom surface of the recess 26) is coated with an antithrombogenic and microorganism adhesion inhibiting substance, and has an antithrombogenic and microorganism adhesion inhibiting coating 62. ing. The coating 62 has antithrombogenicity, thereby suppressing thrombus formation in the implantable drug solution injector. For this reason, the chemical injection failure due to the adhesion of thrombus in the implantable chemical injection device is extremely small. Further, since the coating 62 has the ability to suppress microbial adhesion, it prevents the growth of microorganisms in the implantable drug solution injector and prevents the formation of infectious deposits.
Further, in this embodiment, the antithrombogenic and microorganism adhesion suppression coating 62 is also formed on the inner surface 22 a of the annular wall portion 22. For this reason, the seal member 4 includes a bottom member entry portion that enters the inside from the opening of the bottom member 2, and the tip side surface of the bottom member entry portion is provided on the inner surface 22 a of the annular wall portion 22. The inner wall 22 a of the annular wall portion 22 of the bottom member 2 is in close contact with the thrombotic and microorganism adhesion suppression coating 62. In particular, in this embodiment, as shown in FIGS. 4, 5, and 11, an annular shape is brought into contact with the side surface of the skirt-like protrusion 43 of the seal member 4 accommodated between the bottom member 2 and the upper member 3. An antithrombogenic and microorganism adhesion suppression coating 62 is provided up to the vicinity of the upper portion of the wall portion 22. Therefore, the antithrombogenic and microorganism adhesion suppression coating 62 is surely present between the tip of the skirt-like protrusion 43 and the annular side surface of the bottom member 2. Therefore, thrombus formation between the tip of the skirt-like protrusion 43 and the annular side surface of the bottom member 2 can be reliably prevented. In this embodiment, the bottom surface 44 of the bottom member insertion portion 41 b of the seal member 4 is also coated with the antithrombotic substance 61. The inner surface of the bottom member 2 near the opening of the annular wall portion 22 is preferably not provided with an antithrombogenic and microorganism adhesion suppression coating. In this embodiment, the antithrombogenic and microorganism adhesion suppression coating 62 does not reach the upper end of the annular wall portion 22.

  The antithrombogenic and microorganism adhesion inhibiting coating 62 is a non-solidified coating having a self-recovering property that can pierce the seal member 4 and recover from damage caused by the needle for injecting the chemical liquid that is in contact with the inner bottom surface 21a of the injection tool body. It is used. And it is preferable that the antithrombogenicity and microorganism adhesion suppression coating 62 have a low fluidity rather than a complete hard coating. In particular, the antithrombogenic and microbial adhesion inhibiting coating 62 is preferably a rubber-like coating having low fluidity.

  The antithrombogenic and microbial adhesion inhibiting coating 62 used in the present invention is a non-solidified coating having the above self-healing properties. For this reason, even if contact with the needle for injecting the chemical solution (piercing of the coating) or cutting of the coating with the tip of the Huber needle often used as a needle for injecting the chemical solution, Of antithrombotic substances. Thereby, the piercing trace and the cutting trace formed in the film disappear. This is due to the action of smoothing the surface of the coating film due to the fluidity of the antithrombotic substance that forms the anti-thrombogenic and microorganism adhesion inhibiting coating film 62. However, since the fluidity of the antithrombotic substance is quite low, the coating itself flows toward a certain portion and the inner surface of the bottom member 2 is not exposed. The antithrombogenicity and microorganism adhesion suppression coating 62 in the present invention has both low fluidity and coating form retention.

As the antithrombotic and microorganism adhesion-inhibiting substance having the above properties, a polymer containing alkoxyalkyl (meth) acrylate as a constituent component is suitable. In particular, those not containing a hydroxyl group are preferred. As the polymer of alkoxyalkyl (meth) acrylate, a homopolymer or copolymer of one or more monomers of alkoxyalkyl (meth) acrylate as described below, or the alkoxyalkyl (meth) acrylate and this And a monomer that can be copolymerized with the monomer.
Alkoxyalkyl (meth) acrylates include methoxymethyl acrylate, methoxyethyl acrylate, methoxypropyl acrylate, ethoxymethyl acrylate, ethoxyethyl acrylate, ethoxypropyl acrylate, ethoxybutyl acrylate, propoxymethyl acrylate, butoxyethyl acrylate, methoxybutyl acrylate, methoxy Examples include methyl methacrylate, methoxyethyl methacrylate, ethoxymethyl methacrylate, ethoxyethyl methacrylate, propoxymethyl methacrylate, and butoxyethyl methacrylate. Of these, methoxyethyl acrylate is particularly preferable from the viewpoint of economy and operability.

  Examples of monomers that can be copolymerized with alkoxyalkyl (meth) acrylate include acrylamide, N, N-dimethylacrylamide, N, N-diethylacrylamide, aminomethyl acrylate, aminoethyl acrylate, aminoisopropyl acrylate, and diaminomethyl acrylate. , Diaminoethyl acrylate, diaminobutyl acrylate, methacrylamide, N, N-dimethylmethacrylamide, N, N-diethylmethacrylamide, aminomethyl methacrylate, aminoethyl methacrylate, diaminomethyl methacrylate, diaminoethyl methacrylate, methyl acrylate, ethyl acrylate, Isopropyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate Over DOO, butyl methacrylate, hexyl acrylate, hexyl methacrylate, ethylene, and propylene and the like.

The copolymer may be any of a random copolymer, a block copolymer, and a graft copolymer, and can be used by a known method such as radical polymerization, ionic polymerization, or polymerization using a macromer. The number average molecular weight of the alkoxyalkyl (meth) acrylate polymer is 10,000 to 300,000, preferably 30,000 to 100,000.
The anti-thrombotic substance is coated by coating a solution of the above alkoxyalkyl (meth) acrylate polymer by a known method such as a dipping method, a spray method, or a flow coater method, and then drying. The film thickness is sufficient if it is 1 μm or more, preferably 1 mm or less.

  Specific examples of the antithrombotic substance used in the present invention include polymethoxyethyl acrylate and methoxybutyl acrylate obtained by polymerization using azobisisobutylnitrile as an initiator in a methanol solution containing a predetermined amount of methoxyethyl acrylate. A random copolymer obtained by polymerizing polymethoxybutyl acrylate, methoxyethyl acrylate and ethyl methacrylate in butanol and benzoin peroxide as initiators in a methanol solution containing a fixed amount using azobisisobutylnitrile as an initiator. There is a random copolymer obtained by polymerizing methoxyethyl acrylate and ethyl methacrylate in benzene and using benzoin peroxide as an initiator.

  The seal member 4 has the upper surface side of the flange portion 42 pressed by the annular protrusion 32 of the upper member 3, and the outer edge portion of the lower surface side of the flange portion 42 is the seal member peripheral portion pressing portion on the upper surface of the annular wall portion 22 of the bottom member 2. The annular edge portion 25 of the annular wall portion 22 of the bottom member 2 is inserted into the inner edge portion on the lower surface side of the flange portion 42, and the seal member 4 includes the upper member 3 and the bottom member 2. And is deformed by insertion of the annular edge portion 25 of the bottom member 2, the height of the flange portion 42 is decreased, the height of the bottom member insertion portion 41 b is increased, and the seal member 4 is further deformed. The skirt-like projecting portion 43 is reduced, and the lower end outer peripheral surface of the bottom member inner insertion portion 41 b is in close contact with the inner surface of the annular wall portion 22 of the bottom member 2.

  The ring-shaped upper member 3 includes a ring-shaped main body 31 that accommodates the seal member 4 in a state where the central portion of the seal member 4 is exposed, and an inner portion of the opening (in the center direction). ) Projecting annular projection 32. The annular projecting portion 32 is for pressing the upper surface of the peripheral edge portion (flange portion) 42 of the seal member 4 at the lower surface thereof. Further, in this embodiment, the annular protrusion 32 is formed on the inner edge side portion of the lower surface of the annular protrusion 32, protrudes downward, and has an annular inclined surface having an annular inclined surface whose inner diameter expands downward. 39 is provided. The annular edge portion 39 can be inserted into the upper surface of the flange portion of the seal member 4. The annular projecting portion 32 has a seal member peripheral portion pressing portion 32 a formed on the outer side of the annular edge portion 39 and having an annular and flat surface. The seal member peripheral edge pressing portion 32 a presses (compresses) the flange portion 42 of the seal member 4.

The upper member 3 includes side bulging portions 34 and 35 provided on both sides of the tip of the upper member 3 as shown in FIGS. 2, 3, and 5. Further, the discharge port 5 is located between the side bulging portions 34 and 35. Further, as shown in FIGS. 1 and 3 (particularly, FIG. 1), the upper member 3 is formed between the rear end portion 33 and the side bulging portions 34 and 35, and is substantially a standing surface, and the side portion. In the vicinity of the bulging portions 34 and 35, there are two standing upright side portions 37 and 38 for gripping that are greatly curved as compared with other portions. The center of the seal member 4 is located between the two gripping standing side surfaces 37 and 38 facing each other. Further, in this embodiment, the central portion of the seal member 4 is located between the portions that are largely curved in the vicinity of the side bulging portions 34 and 35 of the two opposing standing side surfaces 37 and 38 for gripping. Yes.
Further, the upper member 3 has a rear end portion 33 that extends to the opposite side of the discharge port 5 from the outer edge of the annular protrusion at a position facing the discharge port 5. The rear end portion 33 is thinner toward the rear end side, and the width is also narrower. In this embodiment, the rear end 33 has a crescent shape that is slightly collapsed, as shown in FIG.

  Further, as shown in FIGS. 1 and 3, the standing side surface portions 37 and 38 extend from the rear end portion 33 toward the side bulging portions 34 and 35, and the height of the standing side surface portion gradually increases. The height is higher, and the vicinity of the central side portion of the annular projecting portion 32 is the highest, and rapidly decreases toward the side bulging portions 34 and 35. As described above, since the gripping standing side surface portions 37 and 38 are the highest in the vicinity of the central side portion of the annular projecting portion 32, the central side portion of the annular projecting portion 32 can be easily gripped. Furthermore, when grasping, the fingertip feels a portion that is largely curved in the vicinity of the side bulging portions 34 and 35, so that the central portion of the annular protrusion 32 (in other words, the central portion of the seal member 4) is between the gripping portions. You can easily recognize that there is. Providing such standing side surfaces 37 and 38 for gripping facilitates the puncturing operation of the drug injection needle after being implanted subcutaneously, and facilitates handling in the subcutaneous implantation procedure.

Furthermore, the upper member 3 includes a cylindrical portion 36 formed between the standing side surface portions 37 and 38 and the upper end of the upper member 3 and having a substantially cylindrical shape or a diameter that is slightly reduced toward the upper end direction. In this embodiment, as shown in FIG. 3, the cylindrical portion 36 is gradually reduced in diameter toward the upper side. By having this cylindrical part 36, it becomes possible to recognize the cylindrical part 36 from the skin surface (in other words, the central part of the annular projecting part 32 and the central part of the seal member 4) after subcutaneous implantation. There is. Further, since the cylindrical portion 36 is provided, the upper part of the drug solution injector 1 can be easily grasped, and the seal member can be easily recognized and reliably grasped by the upper part. The puncture operation of the injection needle can be performed quickly.
Further, as shown in FIGS. 1 to 3 and 5, the side bulging portions 34, 35 become thinner toward the ends of the side bulging portions 34, 35 and penetrate from the upper surface to the lower surface. A through-hole is provided, and elastic members 8 and 9 that can be pierced by a suture needle are embedded in the through-hole, and the side bulging portions 34 and 35 are sewn portions to a living body.
The elastic members 8 and 9 are made of an elastic material. Examples of the material for forming the elastic member include various rubbers such as silicone rubber, isoprene rubber and natural rubber, various resins such as polyurethane, polyamide elastomer, polybutadiene, and soft vinyl chloride, or combinations of two or more thereof. Of these, silicone rubber is particularly preferable because it is inert to the living body and has relatively little change in physical properties.

  The seal member 4 has a cylindrical main body 41 and an annular flange 42 formed on the peripheral edge of the main body 41 so as to protrude from the main body. The flange portion 42 is a portion to be pressed by the lower surface of the annular projecting portion 32 of the upper member 3 and the upper surface of the annular wall portion 22 of the bottom member. Further, the seal member 4 of this embodiment is formed below the flange portion 42, has an outer diameter smaller than that of the flange portion, and a bottom member insertion portion 41b that is substantially equal to the inner diameter of the annular wall portion described above, and the flange portion. The upper member insertion portion 41a is formed above 42, has an outer diameter smaller than that of the flange portion, and is substantially equal to or slightly smaller than the inner diameter of the annular protrusion of the upper member 3 described above.

Further, the seal member 4 includes a skirt-like projecting portion 43 that is formed on the peripheral edge portion of the lower surface 44 of the bottom member inner insertion portion 41b and becomes thinner toward the end portion. As shown in FIG. 8, the skirt-like projecting portion 43 becomes thinner toward the lower end and the inner diameter is increased. For this reason, the inner surface of the skirt-like protrusion 43 is an inclined surface that increases in diameter toward the lower end (specifically, a curved inclined surface that increases in diameter toward the lower end).
The upper member insert portion 41a of the seal member 4 is inserted into the opening of the upper member 3, and its upper end protrudes from the upper surface of the upper member 3 as shown in FIGS. Further, the bottom member internal insertion portion 41b of the seal member 4 is accommodated and entered into the annular wall portion 22 of the bottom member 2 as shown in FIGS. And the chemical | medical solution inflow space 10 is formed by the lower surface 44 of the bottom part member insertion part 41b of the sealing member 4, and the inner surface of the recessed part 26 of the bottom member 2. As shown in FIG.

As a material for forming the injection tool main body (bottom member 2, upper member 3), a material having chemical resistance and biocompatibility is preferable, and polysulfone, polyethersulfone, epoxy resin, polyacetal and the like are used.
The seal member 4 can be pierced by a needle for injecting a chemical liquid, and the piercing portion is sealed after the needle for injecting a chemical liquid is removed. The seal member 4 is made of an elastic material. As a material for forming the seal member 4, various rubbers such as silicone rubber, isoprene rubber and natural rubber, various resins such as polyurethane, polyamide elastomer, polybutadiene, and soft vinyl chloride, or a combination of two or more of these may be used. Among them, particularly preferred is silicone rubber which is inert to the living body and has relatively little change in physical properties.

In this embodiment, as shown in FIGS. 6 to 8, the sealing member 4 is such that the upper surface side 42 a of the flange portion 42 is pressed by the annular protrusion 32 of the upper member 3, and the lower surface side of the flange portion 42. The outer edge portion of 42 b is pressed by the sealing member peripheral edge pressing portion 22 b on the upper surface of the annular wall portion 22 of the bottom member 2, and the annular edge of the annular wall portion 22 of the bottom member 2 is formed on the inner edge portion on the lower surface side of the flange portion 42. Edge portion 25 is inserted.
Further, in this embodiment, the outer edge portion on the upper surface side of the flange portion 42 is pressed by the seal member peripheral portion pressing portion 32a on the lower surface of the annular projecting portion 32 of the upper member 3, and the inner edge on the upper surface side of the flange portion 42. An annular edge 39 of the annular protrusion 32 of the upper member 3 is inserted into the part.
As described above, in the chemical solution injector 1 of this embodiment, the flange portion 42 of the seal member 4 has the annular edge portions 25 and 39 inserted into the upper surface and the lower surface, so that the seal member is surely secured. And is securely held in a liquid-tight state.

Then, the seal member 4 is strongly compressed between the upper member 3 and the bottom member 2 (specifically, pressed by the seal member peripheral portion pressing portion 22b of the bottom member 2 and the seal member peripheral portion pressing portion 32a of the upper member 3). Due to the strong compression) and the insertion of the annular edge portion 25 of the bottom member 2, the state shown in FIGS. 6 to 8 and 11 is changed to the form shown in FIGS. 4 and 5. FIG. 11 is an explanatory diagram for explaining a state before the upper member and the bottom member of the chemical liquid injector 1 of this embodiment are fixed. As shown in FIG. 11, when the seal member 4 is placed on the bottom member 2 and the upper member is put on the seal member 4, the lower surface of the upper member 3 and the upper surface of the bottom member 2 are separated by a predetermined distance. The upper member 3 is in a floating state. Then, by being compressed between the upper member 3 and the bottom member 2, the seal member 4 is deformed from the state of FIG. 11 to the form shown in FIGS. 4 and 5, and the upper member 3 and the bottom member 2 are In contact and fixed in that state.
When the seal member 4 is deformed from the state of FIG. 11 to the form shown in FIGS. 4 and 5, the height of the flange portion 42 is reduced by 20 to 45%, preferably 25 to 40%. The height of the inner insertion portion 41b increases 1.5 to 3 times, the height of the upper member inner insertion portion 41a increases 1.3 to 2 times, and the height at the center portion of the seal member ( Thickness) is increased 1.5 to 2.5 times.

  The penetration depth of the bottom member insertion portion 41b into the bottom member is increased due to a decrease in the height of the flange portion 42 and an increase in the height of the bottom member insertion portion 41b. Similarly, as the height of the flange portion 42 decreases and the height of the upper member insertion portion 41a increases, the penetration depth of the upper member insertion portion 41a into the opening of the upper member increases, As shown in FIGS. 4 and 5, it protrudes from the opening of the upper member 2. Further, as shown in FIGS. 4 and 5, the skirt-like projecting portion 43 of the seal member 4 is reduced, and the outer peripheral surface at the lower end of the bottom member inner insertion portion 41 b is the inner surface (anti-resistance) of the bottom wall member 2. It is in close contact with the thrombotic and microbial adhesion-inhibiting coating surface.

Further, in this embodiment, the seal member 4 is strongly compressed between the upper member 3 and the bottom member 2 (specifically, compression that reduces the height (thickness) of the flange portion by 20% or more). The skirt-like protrusion 43 of the seal member 4 has almost disappeared due to the deformation caused by the insertion of the annular edge portion 25 of the bottom member 2. By the high compression from the upper and lower surfaces of the flange portion 42 of the seal member 4 described above, the height (thickness) of the seal member decreases and the height (thickness) increases as a whole (central portion). And is expected to have disappeared.
Further, the increase in thickness due to the above-described strong compression is to press the side surface of the bottom member insertion portion 41b of the seal member 4 against the inner surface of the annular wall portion 22 of the bottom member 2, and the adhesion between the two becomes more reliable. I think.

In addition, when the annular edge portion 25 of the bottom member 2 was inserted into the inner corner portion of the lower surface of the flange portion 42 of the seal member 4 without providing the skirt-like projecting portion 43, the vicinity of the inner corner portion was pulled outward. Due to this pulling, the side surface portion of the bottom member insertion portion 41b of the seal member 4 is pulled up, and a gap is formed between the lower end of the side surface portion of the bottom member insertion portion 41b and the inner surface of the annular wall portion 22 of the bottom member 2. The possibility of being formed is high.
Moreover, in the chemical | medical solution injection tool 1 of this Example, although it thinks that it originates in the said deformation | transformation of the seal member 4, the lower surface of the bottom member insertion part 41b of the seal member 4 will be in the state where the center part was slightly depressed. ing. Thus, the center part of the chemical | medical solution inflow space 10 is high because the center part of the lower surface of the bottom member insertion part 41b of the seal member 4 is depressed.

In the chemical solution injector 1 of this embodiment, the chemical solution inflow space 10 has a predetermined height formed by the inner surface of the seal member 4 and the inner surface of the recess 26 (the inner surface of the annular wall portion 22 and the upper surface of the bottom plate portion 21). It is a cylindrical space having a thickness.
The inner surface of the bottom member insertion portion 41 b of the seal member 4 has a minute uneven surface 44 on the inner side of the chemical solution inflow space. The minute uneven surface 44 is preferably formed by embossing a chemical solution inflow space side inner surface forming portion in a mold for molding the seal member 4 by blasting or the like. The seal member 4 is deformed from the state of FIG. 8 to the state of FIG. 12 (FIG. 4) by being compressed by the upper member and the bottom member. As shown in FIGS. 8 and 12, the shape of the inner surface on the chemical solution inflow space side is also deformed. Since the change in the area of the inner surface of the chemical solution inflow space itself is not so large, it seems that the change in the concavo-convex shape on the minute concavo-convex surface is not so large, but still seems to be slightly deformed.

  The size of the unevenness on the minute uneven surface 44 can be adjusted by the size of the roughening particles used for the blasting of the inner surface forming part on the side of the chemical solution inflow space in the mold for molding the seal member 4. When the inventor of the present application examined, the particle size passed through ASTM mesh 18 (mesh 1.00 mm) to ASTM mesh 70 (mesh 0.210 mm) and ASTM mesh 80 (mesh 0.177 mm). It is preferable to use a metal particle that does not pass through a roughening treatment. In particular, metal particles that pass through ASTM mesh No. 20 (aperture 0.841 mm) to ASTM mesh No. 60 (aperture 0.250 mm) and do not pass ASTM mesh No. 80 (aperture 0.177 mm). A surface-roughened one is preferred.

  The seal member 4 can be pierced by a needle for injecting a chemical liquid, and the piercing portion is sealed after the needle for injecting a chemical liquid is removed. The seal member 4 is made of an elastic material. The material for forming the seal member 4 is formed of a water repellent soft material. Specific examples of the forming material include various rubbers such as silicone rubber, isoprene rubber and natural rubber, various resins such as polyurethane, polyamide elastomer, polybutadiene, and soft vinyl chloride, or combinations of two or more of these. Among them, particularly preferred is silicone rubber which is inert to the living body and has relatively little change in physical properties.

  And the anti-thrombotic substance 61 which became innumerably scattered or became a film is given to the minute uneven surface 44 which is the chemical solution inflow space side inner surface of the seal member 4. Then, the partial exposure of the forming material of the seal member 4 due to the liquid repellency of the antithrombotic substance-containing liquid is suppressed by the micro unevenness formed on the micro uneven surface, whereby the antithrombotic substance 61 is Are scattered or coated almost uniformly on the entire inner surface of the chemical solution inflow space. Further, the antithrombotic substance imparted to the minute uneven surface 44 is an anti-thrombogenic non-solidified substance, and the inner surface on the side of the chemical solution inflow space has minute unevenness. Maintain the shape of the entire surface.

  And as the antithrombotic substance 61, it is preferable not to be a perfect hard substance but to have low fluidity. In particular, the antithrombotic substance 61 is preferably a rubber-like material having low fluidity. The antithrombotic substance 61 may be a non-solidified film. In this case, even when pierced by the medicinal solution injection needle, the antithrombotic substance around the puncture mark flows. Thereby, the piercing trace formed in the film disappears. This is due to the action of trying to smooth the surface of the coating film by the fluidity of the antithrombotic substance that forms the antithrombogenicity and microorganism adhesion suppression coating film. As the antithrombotic substance 61, those described for the antithrombogenic and microbial adhesion suppressing film 62 are preferably used.

Furthermore, as shown in FIGS. 1 to 5, a discharge port 5 is attached to the chemical solution injector 1 of this embodiment. The discharge port 5 is a cylindrical body, and includes a catheter proximal end mounting portion 53 provided on the distal end side, a bottom member mounting portion 52 provided on the proximal end side, and a flow passage 51 provided inside. I have. The proximal end opening 50 is the proximal end of the flow passage 51 and is located at the proximal end of the bottom member mounting portion 24.
An annular protrusion for preventing the catheter from coming off is provided on the outer surface of the catheter proximal end mounting portion 53. The bottom member mounting portion 52 is inserted into the discharge port mounting portion 24 of the bottom member 2 and is liquid-tightly fixed.
As the forming member of the discharge port 5, titanium, titanium alloy, stainless steel, or the like can be used, and titanium or titanium alloy is particularly preferable.

  Moreover, the chemical | medical solution injection tool 1 of this invention is connected to the catheter 7 and the protector 6 as shown in FIG. 13 at the time of use. The proximal end portion 71 of the catheter 7 is attached to the discharge port 5 so as to encapsulate the catheter proximal end attachment portion 53, and the protector 6 is attached to the proximal end portion of the catheter 7 attached to the catheter proximal end attachment portion 53. 71 is fitted and pressed to prevent the catheter from being detached. As the catheter 7, a catheter that can be inserted into the body (specifically, a blood vessel (vein or artery), a bile duct, a ureter such as a ureter, an epidural, subarachnoid, abdominal cavity) is used.

The catheter 7 is a tube body having a distal end side opening and an internal lumen, and has the same outer diameter and the same inner diameter throughout the entire body. The outer diameter of the catheter is preferably from 0.3 to 5 mm, particularly preferably from 0.9 to 2.8 mm. Further, the inner diameter of the catheter is preferably 0.1 to 2.6 mm, particularly preferably 0.6 to 1.8 mm.
The catheter 7 is flexible and preferably has some elasticity. Examples of the catheter forming material include olefin-based elastomers (for example, polyethylene elastomers, polypropylene elastomers), polyesters such as polyethylene terephthalate, soft polyvinyl chloride, polyurethane and urethane-based elastomers, polyamides and amide-based elastomers (for example, polyamide elastomers). , A polymer material having flexibility such as a fluororesin elastomer, an ethylene-vinyl acetate copolymer, and silicone rubber.

(Experiment 1)
A bottom member having the form shown in FIGS. 9 and 10 was produced using polyether sulfone, and a product equipped with a discharge port 5 made of a titanium alloy was produced.
Polymerization was carried out at 50 ° C. for 3 hours in a methanol solution containing 20 parts by weight of methoxyethyl acrylate using azobisisobutylnitrile (0.5 part by weight) as an initiator to obtain polymethoxyethyl acrylate. The obtained polymethoxyethyl acrylate was diluted with a mixed solution of methanol and water to prepare a coating solution. After sealing the tip of the discharge port, a predetermined amount of coating liquid was injected into the recess of the bottom member. And in the state which maintained sealing of the discharge port, the hot air was provided to the injected coating liquid, the solvent was volatilized, and the antithrombogenic property and microorganisms adhesion suppression film was formed in the inner surface of a bottom part member. The thickness of the coating was 0.02 mm. When the inner bottom surface of the bottom member having the antithrombogenic and microbial adhesion inhibiting coating was scraped with a drug injection needle (Huber needle), scratch marks as shown in FIG. 14 (Photo 1) were formed. . And when it observed 30 minutes later, as shown in FIG. 15 (photograph 2), it became a thing which a rubbing trace cannot be visually recognized.

Example 1
A ring-shaped upper member having the shape shown in FIGS. 1 to 5 was produced using polyethersulfone. Seal members (septums) of the form shown in FIGS. 6 to 8 were made of silicone rubber. Further, as the bottom member, a member having an antithrombogenicity and microorganism adhesion suppression coating on the inner surface of the bottom member prepared in Experiment 1 was used.
And the sealing member was made into the state in which the lower surface of the insertion part in a bottom member faced upwards, and the coating liquid used in Experiment 1 was inject | poured into the recessed part which a lower surface forms. Then, hot air was applied to the injected coating liquid to volatilize the solvent and form an antithrombogenic and microorganism adhesion suppression coating on the entire lower surface of the bottom member insertion portion of the seal member. The thickness of the coating was 0.02 mm.
And after arrange | positioning said bottom member, an upper member, and a sealing member as shown in FIG. 11, after compressing a sealing member by pressing an upper member, an upper member is ultrasonically sealed to a bottom member, FIG. Or the chemical | medical solution injection tool of this invention as shown in FIG. 5 was produced.

(Comparative Example 1)
Example, except that the bottom member does not have an antithrombogenicity and microorganism adhesion suppression coating, and the sealing member does not have an antithrombogenicity and microorganism adhesion suppression coating on the lower surface of the insertion part in the bottom member 1 was prepared in the same manner as in Example 1.

(Experiment 2)
A microorganism-containing solution was prepared using microorganisms (bacteria: coagulase-negative staphylococci) and the content adjusted to 2 McFarland (6 × 10 ⁸ CFU / mL). Then, the bacteria-containing liquid was filled in a syringe equipped with a drug solution injection needle. The seal member of the drug solution injector of Example 1 and Comparative Example 1 was punctured with the drug solution injection needle of the syringe, and the bacteria-containing solution was injected into the drug solution injector. After a lapse of 48 hours, a syringe with a drug solution injection needle filled with physiological saline was punctured into the seal member of each drug solution injector, and physiological saline was injected into the drug solution injector to wash away the bacteria-containing solution. Then, each chemical | medical solution injection tool was fractured | ruptured, when the bacteria count in the inner bottom face of a bottom part member was measured and compared, the bacteria count adhering to the chemical | medical agent injection instrument of Example 1 was bacteria in the chemical injection instrument of the comparative example 1. About 4% of the number.

(Experiment 3)
A fungus-containing solution was prepared using microorganisms (bacteria: coagulase-negative staphylococci) and the content adjusted to 2 McFarland (6 × 10 ⁸ CFU / mL). Then, the bacteria-containing liquid was filled in a syringe equipped with a drug solution injection needle. Also, a syringe with a needle for injecting medicinal solution filled with blood is punctured into the sealing member of the medicinal solution injecting device of Example 1 and Comparative Example 1, and blood is injected into the medicinal solution injecting device. The operation of injecting and discharging blood was repeated three times. The needle for injecting the chemical solution of the syringe was punctured into the seal member of each chemical solution injector, and the bacteria-containing liquid was injected into the chemical solution injector. After a lapse of 48 hours, a syringe with a drug solution injection needle filled with physiological saline was punctured into the seal member of each drug solution injector, and physiological saline was injected into the drug solution injector to wash away the bacteria-containing solution. Then, each chemical | medical solution injection tool was fractured | ruptured, when the bacteria count in the inner bottom face of a bottom part member was measured and compared, the bacteria count adhering to the chemical | medical agent injection instrument of Example 1 was bacteria in the chemical injection instrument of the comparative example 1. 1% or less of the number.

The subcutaneous implantable drug solution injector of the present invention is as follows.
(1) An injection tool body having an opening, a chemical solution inflow space communicating with the opening, a discharge port attached to the injection tool body and communicating with the chemical solution inflow space, and the opening of the injection tool body And a sealing member capable of piercing the medicinal solution injection needle, and the sealing member can pierce the medicinal solution injection needle a plurality of times. And an antithrombogenic and microbial adhesion inhibiting coating is provided on the inner bottom surface of the injection device body facing the sealing member, and the antithrombogenic and microbial adhesion inhibiting coating is provided on the sealing member. A subcutaneously implantable drug solution injection device which is a non-solidified film having a self-recovering property capable of recovering damage due to the needle for injecting the drug solution and contacting the inner bottom surface of the injection device body.
In this subcutaneously implantable drug solution injector, even if the antithrombogenic and microbial adhesion-suppressing coating is damaged by the drug injection needle that has pierced the seal member (septum) coming into contact with the inner bottom surface of the bottom member The antithrombogenic and microbial adhesion-inhibiting coating has a self-healing property capable of recovering damage, and thus does not cause thrombus formation due to contact marks formed by contact of the injection needle.

And as an embodiment of the present invention, the following may be sufficient.
(2) The seal member is formed of a water-repellent soft material, and can be pierced a plurality of times with the needle for injecting the chemical solution. Further, the inner surface of the seal member on the side of the chemical solution inflow space is a minute uneven surface. The subcutaneously implantable drug solution injector according to (1) above, wherein the minute uneven surface is provided with an infinite number of antithrombotic substances scattered or coated.
(3) In the subcutaneous implantable drug solution injector, partial exposure of the forming material of the seal member due to the liquid repellency of the antithrombotic substance-containing liquid is suppressed by the minute unevenness formed on the minute uneven surface. Thus, the antithrombotic substance is a subcutaneously implantable drug solution injector according to the above (2), in which the antithrombotic substance is scattered or coated almost uniformly on the entire inner surface of the seal member on the drug solution inflow space side.
(4) The subcutaneously implantable drug solution injector according to any one of (1) to (3), wherein the antithrombotic and microbial adhesion-suppressing coating has low fluidity.
(5) The subcutaneous implantable drug injection device according to any one of (1) to (3), wherein the antithrombogenic and microbial adhesion-suppressing coating is a rubber-like coating having low fluidity.

(6) The injection tool body includes a ring-shaped upper member, and a bottom member having an inner bottom surface of the injection tool body facing the opening and the seal member, and the seal member includes the upper member and the The subcutaneously implantable drug solution injector according to any one of the above (1) to (5), which is housed between the bottom members, closes the opening, and forms the drug solution inflow space in the injector body. .
(7) The bottom member includes the inner bottom surface and an annular wall portion extending in the seal member direction from the inner bottom surface, and the inner surface of the annular wall portion includes the antithrombogenic and microorganism adhesion suppression coating. The subcutaneous implantable drug solution injector according to (6) above.
(8) The seal member includes a bottom member entry portion that enters the opening from the opening of the bottom member, and a tip side surface of the bottom member entry portion is provided on an inner surface of the annular wall portion. The subcutaneously implantable drug solution injector according to (7), which is in close contact with the inner surface of the annular wall portion of the bottom member through the antithrombogenic and microorganism adhesion suppression coating.
(9) The subcutaneously implantable drug solution injector according to any one of (1) to (8), wherein the discharge port includes the antithrombogenic and microbial adhesion suppression coating on the entire inner surface.
(10) The bottom member includes a bottom plate portion, an annular wall portion protruding from the bottom plate portion, a seal member peripheral portion pressing portion formed by an outer edge side portion of an upper surface of the annular wall portion, and the annular wall portion. An annular edge formed on the inner edge side portion of the upper surface of the upper surface, having an annular inclined surface that protrudes upward and whose inner diameter expands upward, and can be inserted into the seal member, The upper member protrudes inwardly from the main body portion that houses the seal member in a state in which the central portion of the seal member protrudes, and the opening portion of the main body portion, and annularly protrudes to press the peripheral edge portion of the seal member And the sealing member is formed on the peripheral portion of the main body portion and the main body portion, and is pressed by the lower surface of the annular protrusion of the upper member and the upper surface of the annular wall portion of the bottom member. From the flange part and the flange part A bottom member insertion portion formed in a lower portion; and a skirt-like protrusion formed at a lower peripheral edge of the bottom member insertion portion and becoming thinner toward an end portion; and the seal member includes the flange portion The upper surface side of the flange member is pressed by the annular protrusion of the upper member, the outer edge portion of the lower surface side of the flange portion is pressed by the seal member peripheral portion pressing portion of the upper surface of the annular wall portion of the bottom member, and the flange The annular edge portion of the annular wall portion of the bottom member is inserted into an inner edge portion on the lower surface side of the bottom portion, and the sealing member is strongly compressed between the upper member and the bottom member, and the bottom member Of the annular edge portion, the height of the flange portion is reduced, the height of the insertion portion in the bottom member is increased, and the skirt-like projecting portion is reduced, and the bottom portion Element The lower end outer peripheral surface of the insertion portion, subcutaneous implantable liquid injection device according to any one of in which the (6) no close contact with the inner surface of the annular wall portion of the bottom member (9).

Claims (10)

An injection device main body having an opening, and a chemical solution inflow space communicating with the opening; a discharge port attached to the injection device main body and communicating with the chemical solution inflow space; and sealing the opening of the injection device main body. A subcutaneously implantable drug solution injection tool comprising a sealing member capable of being pierced with a drug solution injection needle while stopping,
The seal member can be pierced multiple times with the drug injection needle, and an antithrombotic and microorganism adhesion suppression coating is provided on the inner bottom surface of the injection tool body facing the seal member. Further, the antithrombogenic and microorganism adhesion inhibiting coating has a self-healing property capable of recovering damage caused by the needle for injecting the drug solution in contact with the inner bottom surface of the injection tool body through the seal member. Subcutaneous implantable drug solution injector characterized by being a non-solidified coating. The seal member is formed of a water-repellent soft material and can be pierced a plurality of times with the chemical solution injection needle, and the inner surface of the seal member on the side of the chemical solution inflow space is a minute uneven surface, The subcutaneously implantable drug solution injector according to claim 1, wherein the minute uneven surface is provided with an infinite number of antithrombotic substances scattered or coated. In the subcutaneous implantable liquid injector, the partial exposure of the forming material of the seal member due to the liquid repellency of the antithrombotic substance-containing liquid is suppressed by the minute unevenness formed on the minute uneven surface, 3. The subcutaneously implantable drug solution injector according to claim 2, wherein the antithrombotic substance is dotted or coated almost uniformly on the entire inner surface of the seal member on the drug solution inflow space side. The subcutaneously implantable drug solution injector according to any one of claims 1 to 3, wherein the antithrombogenic and microbial adhesion inhibiting coating has low fluidity. The subcutaneously implantable drug solution injector according to any one of claims 1 to 3, wherein the antithrombogenic and microorganism adhesion-suppressing coating is a rubber-like coating having low fluidity. The injection tool body includes a ring-shaped upper member and a bottom member having an inner bottom surface of the injection tool body facing the opening and the seal member, and the seal member is between the upper member and the bottom member. The subcutaneously implantable drug solution injector according to any one of claims 1 to 5, wherein the drug solution inflow space is formed in the injector body by closing the opening. The said bottom member is provided with the said inner bottom face and the annular wall part extended in the said seal member direction from the said inner bottom face, The inner surface of the said annular wall part is equipped with the said antithrombogenicity and microorganisms adhesion suppression coating film. The subcutaneously implantable drug solution injector described in 1. The seal member includes a bottom member entry portion that enters the inside from the opening of the bottom member, and a side surface of the distal end portion of the entry portion in the bottom member is provided on the inner surface of the annular wall portion. The subcutaneous implantable drug solution injection device according to claim 7, which is in close contact with an inner surface of the annular wall portion of the bottom member through a property and a microorganism adhesion suppression coating. The subcutaneous injection type drug solution injector according to any one of claims 1 to 8, wherein the discharge port includes the antithrombogenic and microorganism adhesion suppression coating on the entire inner surface. The bottom member includes a bottom plate portion, an annular wall portion protruding from the bottom plate portion, a seal member peripheral edge pressing portion formed by an outer edge side portion of the upper surface of the annular wall portion, and an inner surface of the upper surface of the annular wall portion. An annular edge formed on the edge portion, projecting upward, having an annular inclined surface whose inner diameter expands upward, and an annular edge portion that can be inserted into the seal member;
The ring-shaped upper member protrudes inward from a main body portion that houses the seal member in a state in which a central portion of the seal member protrudes, and presses a peripheral edge portion of the seal member. For an annular protrusion,
The seal member is formed on a peripheral portion of the main body portion, the flange portion for being pressed by the lower surface of the annular projecting portion of the upper member and the upper surface of the annular wall portion of the bottom member, A bottom member insertion portion formed below the flange portion, and a skirt-like protrusion formed on the lower peripheral edge of the bottom member insertion portion and becoming thinner toward the end,
The seal member is configured such that the upper surface side of the flange portion is pressed by the annular projecting portion of the upper member, and the outer edge portion on the lower surface side of the flange portion is the seal member peripheral portion pressing portion on the upper surface of the annular wall portion of the bottom member. The annular edge portion of the annular wall portion of the bottom member is inserted into the inner edge portion on the lower surface side of the flange portion, and the seal member is interposed between the upper member and the bottom member. Due to strong compression by the insertion and insertion of the annular edge portion of the bottom member, the height of the flange portion decreases, the height of the insertion portion in the bottom member increases, and the skirt-like protrusion 10. The subcutaneous implantable drug solution injector according to claim 6, wherein the outer peripheral surface of the lower end of the inner insertion portion of the bottom member is in close contact with the inner surface of the annular wall portion of the bottom member. .

Images