CN212214764U - Medical filter - Google Patents

Abstract

The utility model discloses a medical filter for infusion, including main part and side cap, form the inner chamber between main part and the side cap, the inner chamber includes first cavity and second cavity, first cavity by side cap, main part and filtration membrane are injectd, and the second cavity by main part and filtration membrane are injectd, and the both ends of main part are equipped with the first passageway that supplies the fluid inflow respectively and supply the second passageway that the fluid flows out, first passageway with first cavity intercommunication, the second passageway with second cavity intercommunication, its characterized in that: the side cover is provided with at least one gas escape chamber, one side of the gas escape chamber is communicated with the outside atmosphere through at least one vent hole, the other side of the gas escape chamber is communicated with the first cavity through a first waterproof breathable film, and a gap is reserved between the vent hole and the first waterproof breathable film. The utility model aims to achieve the purpose of providing a medical filter for intravenous injection which can effectively exhaust gas in filtrate in time.

Description

Medical filter

Technical Field

The utility model relates to a filter, in particular to a medical filter for transfusion.

Background

Intravenous injection is always an effective way for clinically rescuing critical patients and treating various diseases, can directly inject liquid medicine into blood, and can play the drug effect at the highest speed. However, the liquid medicine or the transfusion system itself always has inevitable insoluble particles, which is a problem for medical staff and patients. When these insoluble particles enter the human body through the drug solution, they may cause the microcirculation of the human body and organs to be clogged, and in severe cases, they may cause venous embolism and phlebitis. Especially for patients requiring long-term infusion, the injury is unconsciously slow and the consequences are more serious. At present, when medicines are injected intravenously, hospitals usually use a disposable intravenous infusion filter, so that most fine particles can be blocked in the filter, and the safety of patients is ensured.

In the utility model patent document with publication number US20020058913a1, a medical filter for infusion is disclosed, comprising a box-shaped body with a cavity, in which a filter channel is provided, so that the filtered liquid flows out of the medical filter through an outflow handle.

In the filtration process of medical infusion, it is necessary to ensure that no gas is contained in the liquid medicine, and therefore, a filter having a gas exhaust function is widely used clinically. However, most of the filters adopted in the prior art have the defect of unsmooth air exhaust, and air bubbles can enter veins in the infusion process, so that air embolism or pneumothorax can be caused in serious cases, and even the life of a patient can be threatened.

SUMMERY OF THE UTILITY MODEL

The utility model aims to achieve the purpose of providing a medical filter for intravenous injection which can effectively exhaust gas in filtrate in time.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a medical filter, including main part and side cap, form the inner chamber between main part and the side cap, the inner chamber includes first cavity and second cavity, first cavity is by side cap, main part and filtration membrane are injectd, the second cavity is by main part and filtration membrane are injectd, the both ends of main part are equipped with the first passageway that supplies the influent fluid and the second passageway that supplies the effluent fluid respectively, first passageway with first cavity intercommunication, the second passageway with the second cavity intercommunication, its characterized in that: the side cover is provided with at least one gas escape chamber, one side of the gas escape chamber is communicated with the outside atmosphere through at least one vent hole, the other side of the gas escape chamber is communicated with the first cavity through a first waterproof breathable film, and a gap is reserved between the vent hole and the first waterproof breathable film.

The utility model discloses a theory of operation does: after the main body and the side cover are fixedly sleeved, the first channel is connected with an infusion tube of a medical infusion apparatus, liquid medicine enters the first cavity through the first channel, the liquid medicine enters the second cavity after being filtered by the filtering membrane under the action of pressure, and then the filtered liquid medicine flows out from the second channel which is connected to the intravenous needle; wherein the gas mixed in the medical liquid is discharged out of the medical filter through the gas escape chamber. Specifically, the gas escape chamber is provided with a vent hole, and a gap is reserved between the vent hole and the first waterproof breathable film covered on the vent hole. Compare with the scheme that traditional bleeder vent and waterproof ventilated membrane hug closely together, so design can increase the effective utilization area of first waterproof ventilated membrane, improves exhaust rate. And the clearance formed by the air holes and the first waterproof air-permeable film can buffer the gas escaping from the liquid, so that the phenomenon that the gas cannot escape to the external environment in time along with the flowing of the liquid is prevented.

Further, the first chamber and the gas escape chamber are communicated through a bubble buffer chamber.

And a bubble buffer chamber is arranged between the first chamber and the gas escape chamber. So design is full of the liquid medicine that contains the bubble in first cavity, bubble buffer memory room can keep in the bubble in the liquid medicine to with the bubble to the guide of gaseous escape chamber, guaranteed the timely effectual exhaust of the gas in the liquid medicine, with the effect maximize of gaseous escape chamber.

Further, the first waterproof breathable film still keeps a gap with the air vent after deformation.

When the medical filter is filled with liquid medicine, pressure can be generated inside the liquid medicine to cause the first waterproof breathable film to deform, if the deformed first waterproof breathable film is abutted against the air holes, the exhaust efficiency of the medical filter can be greatly influenced, and the air holes can be blocked to fail to realize the exhaust function of the medical filter in serious cases. Note that the deformation of the first waterproof breathable film referred to herein means the maximum deformation amount of the first waterproof breathable film when the medical filter is filled with the medical liquid.

Further, the internal surface of side cap is equipped with at least one recess, the recess has annular lateral wall surface and diapire, annular lateral wall surface inboard be provided with the parallel annular landing stage face of diapire, first waterproof ventilated membrane is fixed on the annular landing stage face, with the diapire of recess forms jointly the gas escape chamber, first waterproof ventilated membrane with the annular lateral wall surface of annular landing stage face top forms bubble buffer memory room.

The side shell is provided with a groove which forms a gas escape chamber and a bubble buffer chamber together with the first waterproof breathable film. By the design, when the liquid medicine containing gas flows in the first cavity, the gas can escape from the liquid medicine to a high position due to the low density of the gas, and the gas escape chamber is at the high position relative to the first cavity due to the blocking effect of the first waterproof breathable film, so that the gas in the liquid medicine can be effectively collected by the gas escape chamber with the structure, and the gas can be discharged out of the medical filter. Further, be equipped with bubble buffer memory room between gas escape room and the first cavity, so, when the gas in the gas escape room is too late to discharge, the bubble escape room can prevent that too much bubble from attaching to on first waterproof ventilated membrane and the filtration membrane, influencing the discharge efficiency of gas and the filter effect of liquid medicine.

Further, the side covers are provided with the grooves at positions near both ends of the first and second passages, respectively.

The side covers are provided with the grooves near the first and second channels, respectively. By the design, when the liquid medicine entering the medical filter from the first passage carries a large amount of gas inevitably, the groove is arranged near the first chamber, so that the gas in the liquid medicine can be discharged as soon as possible. And in order to prevent the gas which is not completely discharged in the liquid medicine from entering the second chamber, or the gas contained in the second chamber enters the body of the patient through the second channel, so that medical accidents are caused, therefore, a groove also needs to be arranged at the second channel, and the liquid medicine after being filtered is further ensured not to contain gas.

Further, the side covers comprise two side covers with the same structure, and the two side covers, the main body and the filter membrane together form two first chambers.

The side cover comprises two side covers with the same structure, and two first cavities are formed. By the design, the volume of the medical filter can be increased under the condition that the size of the medical filter is unchanged or is slightly changed, and the flow of the liquid medicine is ensured.

Furthermore, a filter membrane mounting frame is arranged inside the main body, a filter membrane is fixed on the filter membrane mounting frame, and a flow dividing cavity is arranged between the filter membrane mounting frame and the outlet of the first channel.

The filter membrane installation frame is fixed with filter membrane in the main part, be provided with the reposition of redundant personnel chamber between the export of filter membrane installation frame and first passageway. By the design, when the medical filter is provided with only one first chamber, the shunting cavity can slow down the potential energy of the liquid medicine entering the medical filter from the first channel, so that particles in the liquid medicine are prevented from scratching the filtering membrane; when the medical filter is provided with the two side covers to form the two first cavities, liquid medicine can be guided to uniformly enter the two first cavities through the distribution of the distribution cavity, and the filtering efficiency of the medical filter is ensured.

Furthermore, the two side surfaces of the filter membrane mounting rack are provided with mounting surfaces, and the filter membranes are respectively fixed on the two mounting surfaces to form the second chamber.

It will be appreciated that medical fluid filters should have sufficient filter membrane area to ensure adequate flow. When the filtering aperture is smaller, the area of the filtering membrane needs to be increased to ensure enough flow, so that the appearance volume of the medical filter is too large, the medical filter is inconvenient for medical staff to use, and the large volume can cause liquid medicine waste. In the utility model discloses a, the second chamber has double-deck filtration membrane, can guarantee the membrane area of medical filter, has got into and has guaranteed the liquid medicine flow.

Further, the gas escape chamber is positioned below the flow dividing cavity and adjacent to the flow dividing cavity

The liquid medicine entering the medical filter from the first passage can inevitably carry gas, and at the moment, the gas escape chamber is connected with the external atmosphere, so that the gas in the liquid medicine can automatically move to the gas escape chamber, the gas can drive the liquid medicine to flow, the liquid medicine is promoted to timely enter the first cavity, and the filtering efficiency can be improved. Moreover, the structure can also reduce the flow resistance of the liquid medicine flowing into the first cavity from the shunt cavity, so that the liquid medicine can flow into the first cavity more smoothly.

Furthermore, the total area of the air holes in the medical filter is 10mm²～14mm²In the meantime.

By the design, the discharge amount and the discharge rate of gas in the medical filter can be ensured, the phenomenon that the gas cannot be discharged completely is avoided, the gas is led to be input into the blood vessel of the human body along with the liquid medicine, and the risk of medical accidents is reduced.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

fig. 1 is a schematic view of a medical filter according to an embodiment of the present invention;

fig. 2 is a schematic exploded view of a filter for chinese medical science according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a filter for TCM according to an embodiment of the present invention;

FIG. 4 is a schematic view of a local enlarged structure of a filter for traditional Chinese medicine according to an embodiment of the present invention;

fig. 5 is a schematic view of a side cover according to a first embodiment of the present invention;

fig. 6 is a schematic view of a medical filter according to an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

The first embodiment is as follows:

fig. 1 is a schematic view of a medical filter 1 for medical use of liquid medicine according to the present invention, and fig. 2 is an exploded schematic view of the medical filter. In order to secure the medical fluid capacity of the medical filter 1, the medical filter 1 includes two side covers 2, a main body 3, and a filtering membrane 4. A first channel 7 for inflow of the chemical liquid and a second channel 8 for outflow of the chemical liquid are provided at both ends of the body 3. Fig. 3 is a schematic sectional view of the medical filter, and fig. 4 is a schematic partial enlarged structural view of the medical filter, and at least one gas escape chamber 10 is provided on the inner surface of the side cover 2, and the gas escape chamber 10 is communicated with the outside atmosphere through at least one vent hole 14, so that the venting function of the medical filter 1 is realized. The medical filter 1 comprises internally two first chambers 5 defined by the side cover 2, the main body 3 and the filter membrane 4, and a second chamber 6 defined by the main body 3 and the filter membrane 4. The first passage 7 communicates with the first chamber 5, the second passage 8 communicates with the second chamber 6, and the gas escape chamber 10 communicates with the first chamber 5 through a first waterproof, gas-permeable membrane 9. Thus, when the medical liquid enters the first chamber 5 from the first passage 7, the gas in the medical liquid can be discharged to the external environment through the gas escape chamber 10, and the sealing performance of the medical filter 1 is ensured due to the blocking effect of the first waterproof breathable film 9. The medical liquid passes through the filtering action of the filtering membrane 4 in the first chamber 5, filter residues are remained in the first chamber 5, and the filtered medical liquid enters the second chamber 6 and flows out of the medical filter 1 through the second channel 8.

In order to better guide the gas in the liquid medicine into the gas escape chamber 10 and prevent excessive bubbles from attaching to the first waterproof gas-permeable membrane 9 and the filter membrane 4, a bubble buffer chamber 11 is provided between the first chamber 5 and the gas escape chamber 10. Therefore, when the first chamber 5 is filled with the liquid medicine containing bubbles, the bubble buffer chamber 11 can temporarily store the bubbles in the liquid medicine and guide the bubbles to the gas escape chamber 10, so that the timely and effective discharge of the gas in the liquid medicine is ensured.

Specifically, because the density of the gas is lower than that of the liquid, the gas in the liquid medicine can escape to the high position, and in order to better utilize the characteristic, the gas in the liquid medicine is exhausted, as shown in the schematic diagram of the side cover in fig. 5, at least one groove 13 is arranged on the inner surface of the side cover 2, the groove 13 has an annular side wall surface 15 and a bottom wall 17, the annular side wall surface 15 is provided with an annular platform surface 16 parallel to the bottom wall 17, the first waterproof breathable film 9 is fixed on the annular platform surface 16 to form the gas escape chamber 10 together with the bottom wall 17, and meanwhile, the annular side wall surface on the annular platform surface 16 can be used as a pre-positioning structure of the first waterproof breathable film 9. At least one ventilation hole 14 communicated with the external atmosphere is formed in the bottom wall 17 of the groove 13. When the first chamber 5 is filled with the medical fluid, the gas escape chamber 10 is located at a high position relative to the first chamber 5, and the gas in the medical fluid can escape the medical fluid to move towards the gas escape chamber 10, and the gas escape chamber 10 with the structure is most effective. In order to prevent the bubbles which cannot be discharged in time in the liquid medicine from attaching to the first waterproof breathable film 9 and the filtering film 4 and affecting the filtering and exhausting efficiency, the bubble buffer chamber 11 is formed on the annular side wall surface above the first waterproof breathable film 9 and the annular platform surface 16. Furthermore, in order to prevent the gas which cannot be discharged in time through the groove 13 at the first channel 7 from entering the second chamber 6 and flowing to the human body along the second channel 8, the other end of the side cover 2 is additionally provided with a groove 13 at the position close to the second channel 8, and the grooves 13 at the two ends of the side cover 2 respectively form corresponding convex structures on the outer surface of the side cover 2. Of course, it will be appreciated by those skilled in the art that the ventilation holes 14 may be provided on the annular side wall surface 15 of the bubble buffer chamber 11 when the annular side wall surface 15 of the gas escape chamber 10 has a certain size. And in order to prevent the airing hole 14 from being blocked by foreign matters and prevent the side cover 2 from being cracked from the airing hole 14, the airing hole 14 is provided with a chamfer on one side facing the inner surface of the side cover 2,

in this embodiment, in order to uniformly distribute the medical liquid into the two first chambers 5 and buffer the potential energy of the medical liquid entering the medical filter from the first channel 7, a filter membrane mounting rack 18 for fixing a filter membrane is disposed inside the main body 3, and a diversion cavity 12 is disposed between the filter membrane mounting rack 18 and the first channel 7. Furthermore, the two side surfaces of the filter membrane mounting rack 18 are respectively provided with a mounting surface 19, and the filter membranes 4 are respectively fixed on the mounting surfaces 19 to form the second chambers 6. It is understood that the medical filter has a sufficient filter membrane area, and this structure increases the flow rate and filtration rate of the medical fluid without changing the volume of the filter or with a small change in the volume of the filter. Of course, as shown in a cross-sectional view of a medical filter in fig. 6, the medical filter 21 has a first chamber and a second chamber formed by a side cover 2 and a main body 3, and in this case, the filter mounting frame is provided with only one mounting surface, the filter membrane 4 is fixed on the mounting surface, and the medical fluid in the second chamber is filtered by the single-side filter membrane. No matter whether the medical filter is the double-sided filtration as shown in fig. 3 or the single-sided filtration as shown in fig. 6, the filter membrane support ribs 22 are arranged inside the filter membrane mounting rack as shown in the exploded structure of the medical filter as shown in fig. 2, so as to prevent the filter membrane 4 from being wetted and becoming heavy and further damaged in the filtration process. In this embodiment, the surface of the filter membrane support rib 22 is preferably designed to be uneven, so as to allow the filtered liquid medicine to continuously pass through after the filter membrane 4 is deformed, thereby avoiding the phenomenon that the filter membrane is tightly attached to the filter membrane support rib to hinder the liquid medicine filtering.

Specifically, inevitable can carry gas in the liquid medicine that gets into medical filter 1 from first passageway 7, because gas escape chamber 10 is connected with external atmosphere this moment, therefore gas in the liquid medicine can be automatic to gas escape chamber removes, and gaseous removal can drive the liquid medicine and flow, promotes the liquid medicine in time to get into first cavity, can improve filtration efficiency, and when the liquid medicine got into first cavity 5 after the distribution of reposition of redundant personnel chamber 12, because gas escape chamber 10 is located the below of reposition of redundant personnel chamber 12, so, can reduce the flow resistance that the liquid medicine flowed to first cavity 5 from reposition of redundant personnel chamber, let the more smooth and easy flow of liquid medicine in first cavity 5. In the embodiment, since the gas escape chamber 10 is formed by the groove 13 disposed on the side cover 2, when the liquid medicine flows from the branch chamber 12 to the first chamber 5, the flow area of the liquid medicine is increased due to the groove 13, the flow speed of the liquid medicine can be reduced, the gas in the liquid medicine can be discharged, and the filtering efficiency can be improved.

In order to completely and timely exhaust the gas in the liquid medicine, the total area of the air holes 14 of the medical filter 1 is 10mm²～14mm²In the meantime. Such cases include a medical filter that is double-sided filtration as shown in fig. 3 or single-sided filtration as shown in fig. 6.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims (10)

1. A medical filter, including main part and side cap, form the inner chamber between main part and the side cap, the inner chamber includes first cavity and second cavity, first cavity is by side cap, main part and filtration membrane are injectd, the second cavity is by main part and filtration membrane are injectd, the both ends of main part are equipped with the first passageway that supplies the influent fluid and the second passageway that supplies the effluent fluid respectively, first passageway with first cavity intercommunication, the second passageway with the second cavity intercommunication, its characterized in that: the side cover is provided with at least one gas escape chamber, one side of the gas escape chamber is communicated with the outside atmosphere through at least one vent hole, the other side of the gas escape chamber is communicated with the first cavity through a first waterproof breathable film, and a gap is reserved between the vent hole and the first waterproof breathable film.

2. The medical filter according to claim 1, wherein a bubble buffer chamber is provided between the first chamber and the gas escape chamber.

3. The medical filter of claim 1, wherein the first waterproof, breathable membrane remains in a gap with the vent after deformation.

4. The medical filter as claimed in claim 2, wherein the inner surface of the side cover is provided with at least one groove, the groove has an annular side wall surface and a bottom wall, an annular terrace surface parallel to the bottom wall is provided on the inner side of the annular side wall surface, the first waterproof breathable film is fixed on the annular terrace surface, the first waterproof breathable film and the bottom wall of the groove form the gas escape chamber, and the first waterproof breathable film and the annular side wall surface above the annular terrace surface form the bubble buffer chamber.

5. The medical filter of claim 4, wherein the side cover is provided with the grooves proximate to both ends of the first and second channels, respectively.

6. The medical filter of claim 5, wherein the side covers comprise two side covers of identical construction, the two side covers together with the main body and filter membrane forming the two first chambers.

7. The medical filter as claimed in claim 1, wherein a filter membrane mounting bracket is provided inside the main body, a filter membrane is fixed on the filter membrane mounting bracket, and a flow dividing chamber is provided between the filter membrane mounting bracket and the outlet of the first channel.

8. The medical filter as set forth in claim 7, wherein said filter membrane mounting bracket has mounting surfaces on both sides thereof, said filter membrane being secured to each of said mounting surfaces to form said second chamber.

9. The medical filter of claim 7, wherein the gas escape chamber is located below and adjacent to the shunt lumen.

10. The medical filter of claim 1, wherein the total area of the air-permeable pores in the medical filter is 10mm²～14mm²In the meantime.

Images