Double-layer Medical Fluid Bag

Abstract

A double-layer medical fluid bag includes an inner wall, an outer wall, clean air filled between the inner and outer walls, and a piercing device installed between the inner and outer walls. When it is necessary to use a liquid medicine contained in the medical fluid bag, the piercing device is moved forward to pierce a plate to be pierced, so that the clean air can enter into the inner wall slowly to push the liquid medicine to flow downwardly to the outside. During the operation and use processes, the liquid medicine is completely isolated from outside air, so as to avoid the danger of having unknown outside air to enter into the medical fluid bag and endure the safety of using the medical fluid bag.

Claims

1. A double-layer medical fluid bag, comprising an inner wall, an outer wall and a piercing device, wherein a liquid medicine is filled into an interior space of the inner wall; the outer wall is spaced apart and surrounded around the exterior of the inner wall, and an interior space formed by the outer wall and the interval of the inner wall is provided for filling in clean air; the piercing device is installed between the outer wall and the inner wall; during operation, the piercing device is pressed at the outer surface of the outer wall, so that the piercing device moves forward to pierce the inner wall to allow the clean air to pass into the interior space of the inner wall, so as to produce a pushing effect to the liquid medicine.

2. The double-layer medical fluid bag as claimed in claim 1, wherein the piercing device comprises a column and an insert cavity, and the column is formed on an inner surface of the outer wall, and a cylindrical body of the column extends in a direction towards the inner wall and has a plurality of air holes formed on the cylindrical body of the column and communicated inwardly to a middle air passage, and a front end of the middle air passage is an air outlet with a tapered outer diameter; the insert cavity is formed on the inner wall and configured to be corresponsive to a position extendable and reachable by the air outlet of the column, and the insert cavity is formed into a concave shape in a direction away from the outer wall, and the inner wall of the insert cavity is a thin plate to be pierced, and an end of the air outlet of the column is pressed into the insert cavity.

3. The double-layer medical fluid bag as claimed in claim 2, wherein the cylindrical body of the column has a bump formed at a position with a small distance from the air outlet.

4. The double-layer medical fluid bag as claimed in claim 1, wherein the inner wall has a flexible block disposed at the bottom thereof, and provided for plugging in a nozzle end of a connector, and the rear end of the connector is coupled to an infusion tubing, and a rear end of the infusion tubing is coupled to an infusion tube and communicated downwardly to an injection needle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG. 1 is a schematic view of a conventional medical fluid bag hung onto a drip rack;

[0013] FIG. 2 is a schematic view of an embodiment of the present invention;

[0014] FIG. 3 is a blowup view of Section A of FIG. 2;

[0015] FIG. 4 is a schematic view of an embodiment of the present invention hung onto a drip rack;

[0016] FIG. 5 is a schematic view of an application of an embodiment of the present invention; and

[0017] FIG. 6 is a blowup view of Section B of FIG. 5.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The present invention will become clearer in light of the following detailed description of an illustrative embodiment of this invention described in connection with the drawings.

[0019] The present invention is directed to a medical fluid bag, which is a double-layer medical fluid bag 3 in accordance with an embodiment of the invention. In FIGS. 2 and 3, the medical fluid bag 3 comprises an inner wall 31, an outer wall 32 and a piercing device 33, wherein a liquid medicine 311 is filled into an interior space of the inner wall 31, and a flexible block 312 is disposed at the bottom of the inner wall 31; the outer wall 32 is spaced with an interval and surrounded around the exterior of the inner wall 31, and an interior space between the outer wall 32 and the inner wall 31 is provided for filling a clean air 321, and the air pressure is set according to actual requirements; the piercing device 33 comprises a column 331 and an insert cavity 336, and the column 331 is formed on an inner surface of the outer wall 32, and a cylindrical body of the column 331 extends in a direction towards the inner wall 31 and has a plurality of air holes 332 formed thereon and communicated inwardly to a middle air passage 333, and a front end of the middle air passage 333 is an air outlet 334 with a tapered outer diameter, and the cylindrical body of the column 331 has plurality of bumps 335 spaced with a small distance from the air outlet 334 and formed around the air outlet 334; the insert cavity 336 is formed on the inner wall 31 and configured to be corresponsive to a position extendable and reachable by the air outlet 334 of the column 331, and the insert cavity 336 is in a concave shape formed in a direction away from the outer wall 32, and the inner wall is a thin plate to be pierced 337, and the interior space of the formed insert cavity 336 is preferably partially pressed into an end of the air outlet 334 of the column 331.

[0020] The inner wall 31, the outer wall 32 and the piercing device 33 of the medical fluid bag 3 are all made of a tough and flexible material which is suitable for flexural deformation. Before exiting factory, the interior space of the inner wall 31 of the medical fluid bag 3 has been filled with the liquid medicine 311 of a predetermined volume and sealed in a water-tight and air-tight fashion. In the meantime, the interior space between the outer wall 32 and the inner wall 31 has been filled with the clean air 321 of a predetermined pressure which is set according to actual use. Now, the clean air 321 will enter into the middle air passage 333 through the air hole 332 and reach the air outlet 334, but it still cannot enter into the inner wall 31.

[0021] Before use in medical facilities, the whole medical fluid bag 3 is erected (mainly for the purpose of preventing the medical fluid bag 3 from being hit or knocked down, but it is not necessarily to be hung onto a high position) as shown in FIG. 4, wherein the whole medical fluid bag 3 is also hung onto a drip rack 2, and the flexible block 312 disposed at the bottom of the medical fluid bag 3 is provided for being plugged in by a nozzle end of a connector 313, and a rear end of the connector 313 is coupled to an infusion tubing 314, and a rear end of the infusion tubing 314 rear end is coupled to an infusion tube 315 and communicated downwardly to an injection needle (not shown in the figure), and then the injection needle is provided for injecting the liquid medicine 311 into a patient's arm.

[0022] In FIGS. 5 and 6, an operator just needs to press the outer surface of the outer wall 32 in order to push the column 331 of the piercing device 33 to move forward, and then a front end of the air outlet 334 of the column 331 will move forward to pierce the plate to be pierced 337 of the insert cavity 336, so that the clean air 321 can pass into the interior space of the inner wall 31 and produce a pushing effect of the liquid medicine 311, and the liquid medicine 311 can flow downwardly to the outside. The downward flowing speed of the liquid medicine 311 can be regulated to a slow stable speed by a regulator (which is a prior art), so that there is no concern about a too-fast flow. When the front end of the air outlet 334 of the column 331 pierces the plate to be pierced 337 of the insert cavity 336, the column 331 will be pushed forward further to squeeze the bump 335 of the column 331 into the broken place of the plate to be pierced 337. After the front end of the air outlet 334 of the column 331 is released, the blocking by the bump 335 keeps the front end of the air outlet 334 to remain inside the inner wall 31 to ensure the smoothness of the clean air 321 passing into the inner wall 31.

[0023] In summation of the description above, the present invention mainly provides a double-layer medical fluid bag, wherein clean air is filled between the outer wall and the inner wall, and a piercing device is installed between the outer wall and the inner wall. When it is necessary to use the liquid medicine contained in the medical fluid bag, the piercing device is moved forward to pierce the plate to be pierced, so that the clean air can enter into the inner wall slowly to push the liquid medicine to flow downwardly to the outside. In the operating and using processes, the liquid medicine is completely isolated from the outside air to avoid the danger of entering unknown outside air into the medical fluid bag and ensure the safety of using the medical fluid bag.

[0024] While the invention is described in some detail hereinbelow with reference to certain illustrated embodiments, it is to be understood that there is no intent to limit it to those embodiments. On the contrary, the aim is to cover all modifications, alternatives and equivalents falling within the spirit and scope of the invention as defined by the appended claims.