Self-exhausting and liquid-stopping precision filtration infusion set

Abstract

A self-exhausting and liquid-stopping precision filter infusion set, comprising a bottle stopper puncture device, a drip chamber, a flow regulator, an external conical joint and an infusion needle sequentially connected by a hose. The drip chamber includes a base and a sleeve provided on the base; the base includes a base and a liquid separation plate provided on the base. A liquid passing cavity is recessed on the front surface of the liquid separation plate. A partition plate is provided in the liquid passing cavity, and the partition plate divides the liquid passing cavity into an upper chamber and a lower chamber. A liquid passing hole communicating the upper chamber and the lower chamber is provided on the partition plate; a hydrophilic membrane is welded inside the cavity of the liquid passing cavity, and the hydrophilic membrane is welded to the partition plate to be separated into an upper hydrophilic membrane and a lower hydrophilic membrane; a liquid outlet channel is provided on the back surface of the liquid separation plate, the top of the liquid outlet channel communicates with the upper chamber, and the bottom passes through the base and is connected to the hose. In the present invention, the functions of self-exhausting, self-liquid stopping and precision filtering are integrated inside the drip chamber to improve production efficiency, and the self-exhausting structure is located inside the drip chamber and separated from the external environment, thereby avoiding contamination of the liquid medicine.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a self-exhausting and liquid-stopping precision filtering infusion set. Background Art

[0002] With the improvement of medical standards, more and more functional infusion sets are used clinically, making intravenous infusion operations safer and more convenient. These functions include: 1. Self-exhausting: After the infusion set is inserted into the liquid medicine container, the liquid medicine automatically fills the entire inner cavity of the infusion set, and the liquid level is automatically positioned at a certain height in the drip chamber, automatically completing the exhaust operation; 2. Self-liquid-stopping: After the liquid medicine in the liquid medicine container is infused, the liquid level automatically stops at a certain position in the inner cavity of the infusion set to prevent air from entering the human body; 3. Precision filtering: The liquid medicine filtering medium in the infusion set can filter out particles of 5 microns or smaller in the liquid medicine.

[0003] In existing infusion sets, the functions of self-exhausting, self-liquid-stopping, and precision filtering are distributed on different parts and require multiple assemblies, resulting in low production efficiency. Moreover, the self-exhausting structure is in contact with the outside air, which is prone to safety hazards, leading to contamination of the liquid medicine. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a self-exhausting and liquid-stopping precision filtering infusion set. By integrating the functions of self-exhausting, self-liquid-stopping, and precision filtering inside the drip chamber, the production efficiency is improved, and the self-exhausting structure is located inside the drip chamber, separated from the external environment, thereby avoiding contamination of the liquid medicine.

[0005] A self-exhausting and liquid-stopping precision filtering infusion set includes a bottle stopper puncture device, a drip chamber, a flow regulator, an external conical joint, and an infusion needle sequentially connected by a hose. The drip chamber includes a base and a sleeve provided on the base.

[0006] The base includes a base body and a liquid separation plate provided on the base body. A liquid passing cavity is concavely formed on the front surface of the liquid separation plate. A partition plate is provided in the liquid passing cavity. The partition plate divides the liquid passing cavity into an upper chamber and a lower chamber. A liquid passing hole communicating the upper chamber and the lower chamber is provided on the partition plate.

[0007] A hydrophilic membrane is welded inside the cavity of the liquid passing cavity. The hydrophilic membrane is welded to the partition plate to be separated into an upper hydrophilic membrane and a lower hydrophilic membrane.

[0008] An outlet channel is provided on the back surface of the liquid separation plate. The top of the outlet channel communicates with the upper chamber, and the bottom passes through the base body and is connected to the hose.

[0009] Compared with the prior art, in the present invention, the precise filtration function is realized through the hydrophilic membrane. Through the combined action of the connected upper chamber and lower chamber, and the separated upper hydrophilic membrane and lower hydrophilic membrane, the functions of self-exhaust and liquid stop are achieved, that is, the functions of self-exhaust, self-liquid stop, and precise filtration are integrated inside the drip chamber to improve production efficiency. Moreover, the self-exhaust structure is located inside the drip chamber and is separated from the external environment, thereby avoiding contamination of the liquid medicine.

[0010] Further, a step is formed by the inward concavity of the edge of the cavity of the liquid passing chamber, the hydrophilic membrane is located in the step, and the edge of the step protrudes from the surface of the hydrophilic membrane.

[0011] Further, a liquid shielding plate extends outward from the top edge of the cavity of the liquid passing chamber.

[0012] Further, the length by which the liquid shielding plate protrudes from the surface of the hydrophilic membrane is 0.5 mm to 1.5 mm.

[0013] Further, the liquid outlet channel is arranged in a dislocation manner with the liquid passing hole, and the top of the liquid outlet channel corresponds to the highest point position of the effective filtration part of the upper hydrophilic membrane.

[0014] Further, when there is one liquid passing hole, the liquid passing hole and the liquid outlet channel are respectively located at both ends of the spacer.

[0015] Further, when there are two liquid passing holes, the two liquid passing holes are respectively located at both ends of the spacer, and the liquid outlet channel is located in the middle of the spacer.

[0016] Further, a plurality of support columns are provided in the lower chamber.

[0017] Further, after welding, the effective filtration area of the hydrophilic membrane is 150 mm 2 ~250 mm 2 .

[0018] Further, the nominal filtration pore diameter of the hydrophilic membrane is 0.1 um to 8.0 um. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a self-exhaust liquid-stop precise filtration infusion set in the present invention;

[0020] Figure 2 is Figure 1 an exploded view of the drip chamber in

[0021] Figure 3 is Figure 2 a schematic structural diagram of the base in

[0022] Figure 4 is Figure 2Cross-sectional view of the middle base and the hydrophilic membrane.

[0023] Description of main component symbols:

[0024]

[0025]

[0026] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific embodiments

[0027] For ease of understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixedly provided on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] Please refer to Figures 1 to 4 , a self-exhausting and liquid-stopping precision filtering infusion set provided in an embodiment of the present invention includes a bottle stopper puncture device 11, a drip chamber 12, a flow regulator 13, an external tapered joint 14 and an infusion needle 15 sequentially connected by a hose 10. The drip chamber 12 includes a base 121 and a sleeve 122 provided on the base 121;

[0031] The base 121 includes a base 1211 and a liquid separation plate 1212 provided on the base 1211. A liquid passing cavity 1213 is formed by concaving the front surface of the liquid separation plate 1212. A partition plate 1214 is provided in the liquid passing cavity 1213. The partition plate 1214 divides the liquid passing cavity 1213 into an upper chamber 12131 and a lower chamber 12132. A liquid passing hole 1215 communicating the upper chamber 12131 and the lower chamber 12132 is provided on the partition plate 1214;

[0032] A hydrophilic film 123 is welded inside the cavity of the liquid passing cavity 1213, and the hydrophilic film 123 is welded to the spacer 1214 to be separated into an upper hydrophilic film and a lower hydrophilic film;

[0033] A liquid outlet channel 1216 is provided in the back surface of the liquid separation plate 1212. The top of the liquid outlet channel 1216 communicates with the upper chamber 12131, and the bottom passes through the base 1211 and is connected to the hose 10.

[0034] It should be noted that in the present invention, when the bottle stopper puncturer 11 is inserted into the liquid medicine container, the liquid medicine flows into the drip chamber 12 through the bottle stopper puncturer 11 and the hose 10. The air in the drip chamber 12 penetrates the hydrophilic film 123 and is discharged outside the infusion set in sequence through the liquid passing cavity 1213, the liquid outlet channel 1216, the hose 10, the external conical joint 14 and the infusion needle 15.

[0035] Automatic air exhaust function:

[0036] During the infusion process, the internal liquid level of the drip chamber 12 will slowly rise. Since the hydrophilic film 123 has strong hydrophilicity, the internal liquid level height of the drip chamber 12 is the same as the liquid level height of the lower chamber 12132. Since the hydrophilic film 123 has water absorption, the liquid level of the water absorbed inside the hydrophilic film 123 will be higher than the internal liquid level height of the drip chamber 12 and the liquid level height inside the lower chamber 12132. When the liquid level of the water absorbed inside the hydrophilic film 123 reaches the position of the spacer 1214, since the hydrophilic film 123 here is welded to the spacer 1214, the internal structure is damaged into a microporous-free structure, so it does not have water absorption, and the liquid level cannot cross the spacer 1214 to reach the position of the upper hydrophilic film;

[0037] When the internal liquid level of the drip chamber 12 and the liquid level of the lower chamber 12132 reach the position of the spacer 1214, air continues to penetrate the upper hydrophilic film and is discharged from the infusion set. The internal liquid level of the drip chamber 12 continues to rise, and the liquid level of the lower chamber 12132 will also continue to rise through the liquid passing hole 1215. When the liquid level reaches the upper chamber 12131, since the cross-section of the upper chamber 12131 is narrow, the liquid medicine squeezes the air in the upper chamber 12131 into the liquid outlet channel 1216, and the liquid medicine will fill the entire upper chamber 12131. At this time, the internal liquid level of the drip chamber 12 also reaches the position of the upper chamber 12131, thus wetting the entire upper hydrophilic film. Air cannot penetrate the upper hydrophilic film, and the air in the drip chamber 12 cannot continue to be discharged. The internal liquid level of the drip chamber 12 will be fixed at the top of the upper chamber 12131 and will not continue to rise, while the liquid medicine will continuously penetrate the hydrophilic film 123 and flow through the liquid outlet channel 1216, the hose 10, the external conical joint 14 and the infusion needle 15, so as to fill the entire inner cavity of the infusion set and discharge the air.

[0038] At this time, the inner liquid level of the drip chamber 12 has automatically reached a certain height, and the inner cavity of the pipeline below the drip chamber 12 is filled with the liquid medicine, that is, the self-air-exhaust function of the product is realized.

[0039] Precision filtration function:

[0040] The nominal filtration pore diameter of the hydrophilic membrane 123 is 0.1um to 8.0um to filter out fine particles in the liquid medicine and realize the precision filtration function of the product. In order to meet the requirements of the infusion rate, after welding, the effective filtration area of the hydrophilic membrane 123 is 150mm 2 ~250mm 2 .

[0041] It should be noted that in the present invention, the hydrophilic membrane 123 is made of cellulose, polyolefin, polysulfone, polyamide or fluoropolymer, and is welded to the top of the liquid passing cavity 1213 by thermal welding or ultrasonic welding.

[0042] Furthermore, the cross-sectional shape of the hydrophilic membrane 123 is the same as that of the liquid passing cavity 1213, and can be square, circular, arc-shaped, elliptical or rhombic.

[0043] Automatic liquid stop function:

[0044] After the liquid medicine in the liquid medicine container is infused, the inner liquid level of the drip chamber 12 continues to drop. Since the hydrophilic membrane 123 absorbs water, its fine filtration pores will continue to be wet, the liquid medicine will continue to block the filtration pores, and air cannot break through the bubble point pressure of the membrane material and penetrate into the liquid passing cavity 1213. At this time, the hydrophilic membrane 123 is like a special partition that can only penetrate liquid but not air. Due to the siphon effect, the liquid medicine in the drip chamber 12 will penetrate the hydrophilic membrane 123 and be sucked into the lower chamber 12132 until the inner liquid level of the drip chamber 12 reaches the bottom of the lower hydrophilic membrane;

[0045] When the liquid medicine in the drip chamber 12 runs out, since air cannot penetrate the hydrophilic membrane 123 and no air and liquid medicine enter the liquid passing cavity 1213, at this time, the bubble point pressure of the hydrophilic membrane 123 reaches equilibrium with the gravity of the liquid medicine in the infusion set, and the liquid level in the entire infusion set no longer changes. The liquid medicine stays in the liquid passing cavity 1213 and the hose below the drip chamber 12, realizing the self-liquid-stop function of the product.

[0046] In a preferred embodiment of the present invention, a step is formed by concave inward at the edge of the cavity of the liquid passing cavity 1213, the hydrophilic membrane 123 is located in the step, and the edge of the step protrudes from the surface of the hydrophilic membrane 123.

[0047] Please refer to Figure 3 and Figure 4, a liquid shielding plate 1217 is formed by extending the top edge of the cavity of the liquid passing cavity 1213 outwards. The liquid shielding plate 1217 prevents the liquid medicine dripped from the dropper at the top of the drip hopper 12 from splashing on the hydrophilic membrane 123, thus affecting automatic air exhaust.

[0048] It should be noted that before welding, the position of the hydrophilic membrane 123 is fixed by the liquid shielding plate 1217 and the positioning piece 1218 at the top of the cavity of the liquid passing cavity 1213. The positioning piece 1218 is located on both sides of the hydrophilic membrane 123. At this time, the hydrophilic membrane 123 is directly welded to the top of the cavity of the liquid passing cavity 1213.

[0049] Furthermore, the length by which the liquid shielding plate 1217 protrudes from the surface of the hydrophilic membrane 123 is 0.5 mm to 1.5 mm to achieve a better liquid shielding effect.

[0050] Please refer to Figure 3 , the liquid outlet channel 1216 is arranged in a dislocation manner with the liquid passing hole 1215, and the top of the liquid outlet channel 1216 corresponds to the highest point position of the effective filtering part of the upper hydrophilic membrane, so as to facilitate the complete discharge of the air in the liquid passing cavity 1213.

[0051] Specifically, when there are two liquid passing holes 1215, the two liquid passing holes 1215 are respectively located at both ends of the spacer plate 1214, and the liquid outlet channel 1216 is located in the middle of the spacer plate 1214. After the liquid medicine passes through the liquid passing holes 1215, the air in the upper chamber 12131 is squeezed into the liquid outlet channel 1216 from both ends.

[0052] In another preferred embodiment of the present invention, when there is one liquid passing hole 1215, the liquid passing hole 1215 and the liquid outlet channel 1216 are respectively located at both ends of the spacer plate 1214. After the liquid medicine passes through the liquid passing hole 1215, the air in the upper chamber 1213 is squeezed into the liquid outlet channel 1216 at the other end from the end.

[0053] Please refer to Figure 3 and Figure 4 , a plurality of support columns 1219 are arranged in the lower chamber 12132. The support columns 1219 are used to support the hydrophilic membrane 123 to prevent the membrane from collapsing.

[0054] In a preferred embodiment of the present invention, the number of the spacer plates 1214 is at least 1 piece, and the specific number can be set according to actual needs. And the width is 0.3 mm to 1 mm, and the convex height is 0.2 mm to 0.8 mm.

[0055] In another preferred embodiment of the present invention, the height of the base 1211 is 6 mm - 12 mm to facilitate bonding with the sleeve 122.

[0056] In summary, in the present invention, the precise filtration function is realized through the hydrophilic membrane 123. Through the combined action of the connected upper chamber 12131 and lower chamber 12132, and the separated upper hydrophilic membrane and lower hydrophilic membrane, the functions of self-exhaust and liquid stop are achieved, that is, the functions of self-exhaust, self-liquid stop, and precise filtration are integrated inside the drip chamber 12 to improve production efficiency. Moreover, the self-exhaust structure is located inside the drip chamber 12 and is separated from the external environment, thereby avoiding contamination of the liquid medicine. It can be used in pressure infusion places with a pressure of 200 kPa and is pressure-resistant without leakage.

[0057] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. And the above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

1. A self-exhausting and liquid-stopping precision filtering infusion set, comprising a bottle stopper puncture device, a drip chamber, a flow regulator, an external conical joint and an infusion needle sequentially connected by a hose, characterized in that: The drip chamber includes a base and a sleeve provided on the base; The base includes a base body and a liquid separation plate provided on the base body. A liquid passage cavity is concavely formed on the front surface of the liquid separation plate. A partition plate is provided in the liquid passage cavity. The partition plate divides the liquid passage cavity into an upper chamber and a lower chamber. A liquid passage hole communicating the upper chamber and the lower chamber is provided on the partition plate; A hydrophilic membrane is welded inside the cavity of the liquid passage cavity. The hydrophilic membrane is welded to the partition plate to be separated into an upper hydrophilic membrane and a lower hydrophilic membrane; A liquid outlet passage is provided on the back surface of the liquid separation plate. The top of the liquid outlet passage communicates with the upper chamber, and the bottom passes through the base body and is connected to a hose; A liquid shielding plate extends outward from the top edge of the cavity of the liquid passage cavity. The length of the liquid shielding plate protruding from the surface of the hydrophilic membrane is 0.5 mm to 1.5 mm; The liquid outlet passage is arranged in a dislocation manner with the liquid passage hole, and the top of the liquid outlet passage corresponds to the highest point position of the effective filtering part of the upper hydrophilic membrane.

2. The self-exhausting and liquid-stopping precision filtering infusion set according to claim 1, characterized in that, A step is concavely formed at the edge of the cavity of the liquid passage cavity. The hydrophilic membrane is located in the step, and the edge of the step protrudes from the surface of the hydrophilic membrane.

3. The self-exhausting and liquid-stopping precision filtering infusion set according to claim 1, characterized in that, When there is one such liquid passage hole, the liquid passage hole and the liquid outlet passage are respectively located at both ends of the partition plate.

4. The self-exhausting and liquid-stopping precision filtering infusion set according to claim 1, characterized in that, When there are two such liquid passage holes, the two liquid passage holes are respectively located at both ends of the partition plate, and the liquid outlet passage is located in the middle of the partition plate.

5. The self-exhausting and liquid-stopping precision filtering infusion set according to claim 1, characterized in that, A plurality of support columns are provided in the lower chamber.

6. The self-exhausting and liquid-stopping precision filtering infusion set according to claim 1, characterized in that, After welding, the effective filtering area of the hydrophilic membrane is 150 mm² to 250 mm².

7. The self-exhausting and liquid-stopping precision filtering infusion set according to claim 1, characterized in that, The nominal filtering pore diameter of the hydrophilic membrane is 0.1 um to 8.0 um.

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