WO2014023122A1

WO2014023122A1 - Filter with controllable anti-backflow time in medical infusion device, and medical infusion device

Info

Publication number: WO2014023122A1
Application number: PCT/CN2013/076338
Authority: WO
Inventors: 毛春元
Original assignee: 上海金塔医用器材有限公司
Priority date: 2012-08-07
Filing date: 2013-05-28
Publication date: 2014-02-13
Also published as: CN203075349U

Abstract

A filter with controllable anti-backflow time in a medical infusion device, and the medical infusion device. The filter comprises a pipe (1), a liquid storage tank (5) arranged inside the pipe (1), and an infusion path used in conventional infusion and having an automatic liquid stopping function. The liquid storage tank (5) is provided with at least one through hole (51), each through hole (51) is engaged with a flow control plug (6), and an outer edge of the flow control plug (6) and an edge of the through hole (51) form a gap (7), so that residual soup drops through the gap (7) at an anti-backflow speed, and the flow control plug (6) is inside the through hole (51). The filter can ensure sufficient time for preventing backflow during infusion by using the medical infusion device, further delay dropping time of the soup through a liquid-stopping type hydrophilia filter membrane (4), and implement a function of controllable anti-backflow time. At the same time, the filter is applicable to a conventional medical infusion device, or can be used as Murphy's dropper.

Description

Anti-return blood time controllable filter and medical infusion device on medical infusion set

The invention relates to a filter and a medical infusion device with controllable anti-bleeding time on a medical infusion set. Background technique

There are two kinds of liquid filter of the existing infusion set, one is a filter for a single use infusion set, this is a straight filter, the upper tube is perpendicular to the upper cover of the filter, and the lower tube is perpendicular to the lower cover of the filter. Generally, it is placed in front of the intravenous needle of the infusion set. It can only filter particles larger than 15 microns. The filter membrane is round, the diameter is generally small, generally not more than 12.5mm _{; the} other is a precision filter, which can filter 5 Particles above the micrometer, generally require a large enough filtration area, generally greater than 350mm ² , because the area is too large, in order to facilitate production, the precision filter should not be a straight filter, so the transverse disc structure, that is, the upper tube and the lower The nozzles are parallel to the upper and lower covers of the filter.

When most of the existing infusion sets are to be drained during the infusion, the liquid medicine in the infusion set will continue to flow until the venous pressure of the human body and the gravity of the drug in the infusion set are balanced, and the liquid medicine stops flowing. At this time, due to the diffusion of the liquid, the blood in the human body will flow back into the catheter of the infusion set. This phenomenon not only causes the patient's panic and the nurse spends a lot of time to re-exhaust, etc., but also quickly forms a thrombus, and may even cause The occurrence of medical malpractice. In order to solve these problems, domestic and foreign patented products have automatic liquid infusion infusion sets. The principle is to install a device at the bottom of the Murphy's tube or below the Murphy's tube. When the liquid medicine is finished, the water surface is automatically closed. Or, the Luer connector is made into a one-way valve, and the liquid can flow normally. When the liquid stops, the liquid in the vein needle does not flow back. Such patented products are mistaken for preventing blood return. However, in the article "Research on the position and blood return of the regulator during infusion" in the Southern Medicine Journal, Vol. 2, No. 1, 1995, when the water surface is automatically closed, the liquid on the back is completely weightless (ie Similar to the adjustment of the regulator in the article), due to the action of human venous pressure and the interdiffusion of liquid, the blood will flow back to the infusion In the device, it is impossible to achieve the effect of preventing blood return, and it is more likely to cause the formation of a blood clot, which is more likely to cause a medical accident. In addition, in the prior art, a small amount of residual liquid is introduced into the front end of the scalp needle by a method of drawing a small amount of residual liquid to achieve anti-returning effect, but the manufacturing process of the drainage strip is relatively difficult to form, and the manufacturing cost is relatively expensive, and it is difficult to form. Scale, so this product is also difficult to become a truly practical product.

In order to have sufficient time to prevent blood return when infusion, it is necessary to ensure that the liquid medicine is kept in the infusion set for a sufficient time to slowly flow to overcome the venous pressure that causes the blood of the human body to spread. In order to prolong the time of preventing blood return, it can be achieved by reducing the flow rate of the drug solution and increasing the storage amount of the drug solution in the filter. In the prior art, by providing a water storage tank, sufficient residual liquid is used for preventing blood return when the infusion is about to be completed, and in order to allow the liquid medicine in the water storage tank to be slowly and smoothly dripped, it is usually thought of. The method is to directly drill directly at the bottom of the water storage tank, and the diameter of the hole is controlled to be no more than 0.5mm. However, since the water storage tank and the whole infusion set are generally made of medical plastics, the plastic will expand and contract when it is injected, so it is difficult to accurately control the opening size within 0.5 mm, and the mold is also difficult to produce; During the process, the plastic is prone to elastic deformation. During the infusion process, under the influence of temperature and elastic deformation, the opening at the bottom of the water storage tank is easily blocked or enlarged, so that the outflow rate of the residual liquid in the water storage tank cannot be accurately controlled.

In the patent document CN202892521U, a hollow metal needle tube is used to control the dripping speed of the liquid medicine, but in the production, it is necessary to manually pay attention to the length of the needle tube insertion so that the hole of the side wall of the needle tube is slightly higher than the hole of the water storage tank, so The precision requirements are very high and manufacturing is difficult, which is not conducive to practical production applications. Summary of the invention

The technical problem to be solved by the present invention is to overcome the prior art that the infusion set can not realize the function of preventing blood return, and the infusion set which is easy to cause medical accidents and can prevent blood return has high precision and manufacturing difficulty, which is disadvantageous to practical. The defect of the production application provides a filter and a medical infusion device for preventing blood return time on the medical infusion set. The present invention solves the above technical problems by the following technical solutions:

The invention provides a filter with controllable anti-bleeding time on a medical infusion set, comprising a barrel, the filter further comprising a residual liquid medicine disposed inside the barrel and storing for preventing blood return. a water storage tank and an infusion channel having an automatic liquid stopping function for a conventional infusion; wherein the water storage tank is provided with at least one through hole, and each of the through holes has a tightly fitting control flow a gap formed by the outer edge of the flow control plug and the edge of the through hole, such that the residual chemical liquid drops through the slit at a rate of preventing blood return and causes the flow control plug to be placed in the through hole Inside the hole.

In order to allow the filter to have sufficient time to prevent blood return during infusion, it is necessary to ensure that the drug solution has sufficient time to flow slowly in the infusion set to overcome the venous pressure that causes the blood of the human body to spread. In order to prolong the time of preventing blood return, it can be achieved by reducing the flow rate of the liquid medicine and increasing the storage amount of the liquid medicine in the filter water storage tank. The water storage tank is provided in order to have sufficient residual chemical liquid for preventing blood return when the infusion is about to be completed, in order to allow the liquid medicine in the water storage tank to be slowly and smoothly dripped, in the present invention, In the water storage tank, the control plug is stuck in the through hole and is closely matched with the through hole.

During normal infusion, the liquid will first fill the water storage tank and then overflow along the water storage tank, and the overflowed liquid will firstly be infused through the infusion channel, and the residual liquid medicine stored in the water storage tank It will start to drip slowly for continuous infusion when the automatic infusion is completed after the routine infusion.

The outer edge of the flow control plug and the inner edge of the through hole are formed with a slit. Preferably, the slit may be disposed in an irregular shape, so that the residual chemical liquid in the water storage tank can be utilized and utilized. The surface tension created by the gap formed by the plastic member slowly drops along the gap, and the velocity under the residual drug droplet enables the hydraulic pressure in the filter to overcome the venous pressure of the human blood to diffuse, thereby allowing the filter to reach The function of preventing blood return, and effectively prolonging the time of preventing blood return.

At the same time, the hollow needle tube is no longer used in the present invention, and the gap formed by the outer edge of the control plug and the inner edge of the through hole can be irregular shape, and no high requirement is required in the manufacturing process. The precision makes the filter of the present invention simple to manufacture and suitable for practical use. Moreover, the present invention controls the flow rate of the chemical solution through the slit, and the precision of the control is also higher than that of the prior art, so that the control of the anti-bleeding time is also more precise.

Preferably, the water storage tank is suspended and fixed inside the barrel body. For example

According to CN202892521U, ribs are arranged on the inner wall of the through hole, and the water storage tank is suspended between the ribs.

Preferably, the water storage tank is fixed to an upper half of the tub.

Preferably, the infusion channel is a tubular infusion tube, and the water storage tank is a portion of the barrel having a height lower than a height of the infusion tube. During normal infusion, the liquid medicine in the filter is first subjected to conventional infusion through the infusion tube, and when the height of the liquid medicine in the barrel of the filter is lower than the height of the infusion tube, the liquid medicine The infusion can no longer be performed through the infusion tube, and the portion of the barrel having a height lower than the height of the infusion tube becomes the reservoir to store the residual drug solution.

Preferably, the maximum spacing of the slits is less than or equal to 1 mm.

Preferably, the maximum spacing of the slits is less than or equal to 0.5 mm. Since the spacing of the irregular slits is less than or equal to 0.5 mm, it is ensured that the control plug can be engaged in the through hole without the aid of an adhesive or the like, through the inner wall of the through hole The frictional force generated by the portion in contact with the control plug is greater than the gravity of the control plug itself, so that the flow plug can be kept in the through hole. At the same time, the gap between the through hole and the flow control plug can be set to an irregular shape, so that the time for the same volume of the liquid medicine to flow down can be made uncertain, and thus the blood return prevention can be maximized. time.

Preferably, the at least one through hole is disposed at the bottom of the water storage tank, so that the residual liquid medicine in the water storage tank can be slowly flowed out.

Preferably, the shape of the flow control plug is cylindrical or polygonal. Of course, the shape of the flow control plug can also be set to other shapes as long as the functions of the present invention can be realized.

Preferably, the filter further comprises at least one layer of permeable filter membrane covering the slit. Covering the gap by the at least one permeable filter membrane, so that the liquid medicine is dripped During the process, the at least one layer of the permeable filter membrane is required to further delay the time under the drug droplets, thereby further prolonging the time of preventing blood return.

By adjusting the size of the at least one layer of the permeable filter membrane and the thickness of the permeable filter membrane, the speed of the liquid medicine flowing in the water storage tank can be specifically controlled, and the time for controlling the anti-bleeding time can be adjusted. effect.

In this way, the filter of the present invention can ensure that the medical infusion device maintains sufficient time for the liquid medicine to flow slowly to overcome the venous pressure of human blood diffusion, thereby ensuring sufficient time for the medical infusion device to prevent during infusion. Return blood.

Preferably, the permeable filter membrane is a ring-shaped permeable filter membrane.

Preferably, the permeable filter membrane is a hydrophilic filter membrane.

Preferably, the permeable filter membrane is an annular fiber membrane having an inner diameter of greater than or equal to 1 mm, and the annular fiber membrane is a medically permeable hydrophilic membrane, and the specific types thereof will not be described herein. Of course, the permeable filter membrane may be a highly permeable membrane such as a nylon membrane or a polyethersulfone membrane.

Preferably, the permeimetric filtration membrane per square meter has a weight greater than or equal to 50 g.

Preferably, the at least one layer of the permeable fibrous film is sleeved on the flow control plug or bonded to the edge of the through hole. The permeable fibrous membrane is capable of tightly fitting with the through hole through the flow control plug.

Preferably, the filter further comprises an upper cover and a base which are closely matched with the barrel body. The upper cover is provided with an inlet pipe and an outlet pipe is arranged on the base.

Preferably, a liquid-stopping type hydrophilic filter membrane for automatically stopping liquid is attached to the liquid discharge surface of the infusion channel, so that the infusion channel automatically stops when the hydraulic pressure therein is less than a value. Infusion.

Preferably, at least one notch for preventing air bubbles from passing through is provided in the infusion channel and the outlet pipe.

Preferably, the upper cover is provided with at least one exhaust port, and the lower end surface of the upper cover is attached with a water-blocking hydrophobic filter membrane covering the at least one exhaust port. In this way, it is possible to ensure that the gas in the entire filter can be smoothly discharged through the at least one exhaust port without affecting the normal infusion. In order to make the liquid medicine fill the filter, the liquid medicine cannot flow out from the exhaust port, and during the process of filling the filter liquid, keep the filter and the outside air unobstructed so that the air pressure in the filter is consistent with the atmospheric pressure. The water-repellent hydrophobic filter membrane must be adhered to the lower end surface of the upper cover and sealed to cover the exhaust gas □.

Preferably, the barrel body is provided with at least one venting hole, and the distance between the venting hole and the upper cover is one-third to one-half of the length of the barrel. The inner wall of the barrel is attached with a water-blocking hydrophobic filter membrane covering the at least one vent.

Since the Murphy tube requires that the liquid surface thereof does not exceed one-half to two-thirds of the total height of the Murphy tube, in the present invention, the at least one vent hole is opened in the barrel And a distance between the vent hole and the upper cover is one-third to one-half of the length of the barrel. In this way, when the liquid medicine in the filter does not reach the height of the at least one vent hole, air therein is discharged through the at least one vent hole, and the liquid medicine first fills the filter until the at least The height of a vent. When the chemical liquid completely wets the at least one vent hole, the water-repellent hydrophobic filter membrane is attached to the inner wall of the barrel, so that air can no longer be discharged through the at least one vent hole. At this time, due to the gravity of the liquid itself, the drug is dropped.

And, due to the at least one venting opening, the liquid level of the filter of the present invention does not exceed one-half to two-thirds of the total height of the barrel, thereby enabling the filter of the present invention to directly Used as a Murphy tube.

Preferably, the filter further comprises a hollow conduit inserted from the upper cover into the interior of the barrel, the distance between the bottom of the hollow conduit and the upper cover being three minutes of the length of the barrel One to one-half, the inside of the hollow conduit is provided with a water-blocking hydrophobic filter membrane.

The hollow conduit can also be used to make the liquid level of the filter of the present invention not exceed one-half to two-thirds of the total height of the barrel, thereby also enabling the filter of the present invention to directly act as Murphy Tube use. The specific implementation principle and the at least one vent hole described above are opened in the The barrels are similar, and will not be described here.

Preferably, the barrel is made of a soft material.

In this way, the soft material can make the barrel deformable, for example, the barrel is made of a soft material commonly used in medical fields such as PVC (polyvinyl chloride) of the existing Murphy tube material, and the barrel can be manually The barrel body is disposed in an arbitrary shape, so that the air in the barrel can be discharged when the liquid enters the barrel body, and the liquid level of the liquid medicine in the barrel body can be maintained not to exceed the barrel body. One-half to two-thirds of the total height, so that the barrel can also be used as a Murphy tube.

It is an object of the present invention to provide a medical infusion set characterized in that it comprises the above-described filter.

The medical infusion device specifically includes a cork puncture device, a Murphy tube, a flow rate adjuster, and a venous needle which are sequentially connected through an infusion hose, and the medical infusion device further includes the above filter, and the filter passes the infusion A hose is disposed between the stopper puncturing device and the venous needle. And when the vertical height of the medical infusion device as a whole is higher than the vertical height position of the venous pressure at any position of the human body at the time of infusion, the medical filter has a function of preventing blood return.

At the same time, the filter of the present invention is basically applicable to all conventional medical infusion lines, and as long as it is simply assembled with the filter of the present invention, the infusion line can be prevented from returning blood during normal infusion. Function, and anti-return time is controllable.

Preferably, it is an object of the present invention to provide a medical infusion set characterized in that it comprises the above-described filter as a Murphy tube.

The medical infusion set specifically includes a stopper puncturing device sequentially connected by an infusion hose, the above-described filter as a Murphy's tube, a flow rate adjuster, and a venous needle.

The positive progress of the invention is as follows: The filter of the invention can ensure that the medical infusion device has sufficient time for the liquid medicine in the water storage tank to slowly drip through the gap to overcome the venous pressure of human blood diffusion, thereby ensuring medical treatment. The infusion set can have sufficient time to prevent blood return during infusion, and can further delay the time under the drug droplet through the filter membrane, thereby further increasing The step lengthens the time of preventing blood return, and realizes the function of controllable anti-return time. At the same time, the invention can be applied to any medical infusion set or can be used as a Murphy tube. Moreover, the invention has the advantages of simple assembly, compact and reasonable structure, beautiful appearance, simple manufacturing process, convenient use and reliable performance, and the filter of the invention can be applied to any medical infusion device or used as a Murphy tube. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of a controllable filter for preventing blood return time on a medical infusion set according to a first embodiment of the present invention.

Fig. 2 is a perspective view showing a combination of a water storage tank and a flow control plug in a filter having a controllable blood return time on a medical infusion set according to Embodiment 1 of the present invention.

Fig. 3 is a bottom plan view showing the combination of the water storage tank and the flow control plug in the filter with controllable anti-bleeding time on the medical infusion set according to the first embodiment of the present invention.

Fig. 4 is a perspective view showing the combination of the water storage tank and the flow control plug in the filter with controllable anti-bleeding time on the medical infusion set according to the second embodiment of the present invention.

Fig. 5 is a bottom plan view showing the combination of the water storage tank and the flow control plug in the filter with controllable anti-bleeding time on the medical infusion set according to the second embodiment of the present invention.

Fig. 6 is a perspective view showing a combination of a water storage tank and a flow control plug in a filter having a controllable blood return time on a medical infusion set according to a third embodiment of the present invention.

Fig. 7 is a bottom plan view showing the combination of the water storage tank and the flow control plug in the filter with controllable anti-bleeding time on the medical infusion set according to the third embodiment of the present invention.

Fig. 8 is a view showing the structure of a filter for controlling blood loss prevention time on a medical infusion set according to a fourth embodiment of the present invention.

Fig. 9 is a view showing the structure of a filter for controlling blood loss prevention time on a medical infusion set according to a fifth embodiment of the present invention.

Figure 10 is a first exploded view of a filter with controllable anti-bleeding time on a medical infusion set according to Embodiment 6 of the present invention. Figure 11 is a second exploded view of the filter with controllable anti-bleeding time on the medical infusion set of Example 6 of the present invention.

Figure 12 is a cross-sectional view taken along line A-A of Figure 11 .

Fig. 13 is a view showing the configuration of a filter for controlling blood loss prevention time on a medical infusion set according to a seventh embodiment of the present invention.

Fig. 14 is a perspective view showing a combination of a water storage tank and a flow control plug in a blood filter with controllable blood return time on a medical infusion set according to a seventh embodiment of the present invention.

Fig. 15 is a view showing the structure of a filter for controlling blood loss prevention time on a medical infusion set according to Embodiment 8 of the present invention.

Fig. 16 is a view showing the structure of a filter for controlling blood loss prevention time on a medical infusion set according to Embodiment 9 of the present invention.

Fig. 17 is a first exploded view of the filter having controllable anti-bleeding time on the medical infusion set of the tenth embodiment of the present invention.

Figure 18 is a second exploded view of the controllable filter for preventing blood return time on the medical infusion set of Example 10 of the present invention.

Figure 19 is a schematic view showing the structure of a medical infusion set according to Embodiment 11 of the present invention.

Figure 20 is a schematic view showing the structure of a medical infusion set according to Embodiment 12 of the present invention.

Figure 21 is a schematic view showing the structure of a medical infusion set according to Embodiment 13 of the present invention. detailed description

Example 1

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the anti-return blood time controllable filter on the medical infusion set of the embodiment includes a barrel 1 and an upper cover 2 and a base respectively closely fitting with the barrel 1 . 3. An inlet pipe 21 and an outlet pipe 31 are respectively inserted into the upper cover 2 and the base 3, and a liquid-repellent type hydrophilicity having an automatic liquid stopping function is sealed and fixed between the base 3 and the barrel 1. Filter membrane 4. The filter further includes a water storage tank 5 and an infusion channel, the water storage tank 5 is fixed inside the barrel body 1, can store residual chemical liquid for preventing blood return, and the infusion channel can be used for The conventional infusion solution, wherein the liquid-repellent type hydrophilic filter membrane 4 is attached to the liquid-out surface of the infusion channel, so that the infusion channel automatically stops the infusion when the hydraulic pressure therein is less than a value. The water storage tank 5 is provided with at least one through hole 51, and each of the through holes 51 is engaged with a control plug 6 to closely fit and form a slit 7.

The filter of the present invention is provided with the water storage tank 5, and the water storage tank 5 can store sufficient residual chemical liquid when the filter is infused, so that the filter can be utilized when the filter is automatically stopped after the infusion is completed. The residual drug solution stored in the water storage tank 5 is described to prevent blood return. In order to allow the liquid medicine inside the water storage tank 5 to be slowly and smoothly dripped, in the present invention, the at least one through hole 51 is opened in the water storage tank 5, and each of the through holes 51 is A flow control plug 6 is engaged with each other and formed with a slit 7, so that the residual liquid can be slowly dripped by the gap 7 between the through hole 51 and the flow control plug 6.

In order to allow the filter to have sufficient time to prevent blood return during infusion, it is necessary to ensure that the drug solution has sufficient time to flow slowly in the infusion set to overcome the venous pressure that causes the blood of the human body to spread. In order to prolong the time of preventing blood return, it can be achieved by reducing the flow rate of the drug solution and increasing the storage amount of the drug solution in the filter. The water storage tank 5 is provided in order to prevent sufficient blood from being returned to the blood when the liquid is automatically stopped immediately after the infusion is completed, in order to allow the liquid medicine in the water storage tank 5 to be slowly and smoothly dripped. In the invention, it is realized by providing the through hole 51 in the water storage tank 5 and the flow control plug 6 which is engaged with and closely fitted with the through hole 51.

An irregular slit 7 is formed in the outer circumference of the flow control plug 6 and the inner edge of the through hole 51, so that the liquid medicine can be slowly dripped along the slit 7, and the speed under the residual medicine droplet can make the The hydraulic pressure in the filter can overcome the venous pressure of human blood diffusion, thereby making the filter achieve the function of preventing blood return and effectively prolonging the time of preventing blood return.

Preferably, the pitch of the slits 7 is less than or equal to 1 mm, and more preferably, the pitch is less than or equal to 0.5 mm. By setting the spacing of the slits 7 to be less than or equal to 0.5 mm, it is ensured that the flow control plug 6 can be engaged in the through hole 51 without the aid of an adhesive or the like, through the through The frictional force generated by the portion of the inner wall of the hole 51 that is in contact with the flow control plug 6 is greater than the gravity of the control plug 6 itself, so that the flow control plug 6 can be placed in the through hole 51 while The liquid medicine can be slowly dripped along the slit 7. At the same time, the gap 7 between the through hole 51 and the flow control plug 6 can be set to an irregular shape, so that the time for the same volume of the chemical liquid to flow down can be made uncertain, and thus the maximum length can be extended. Time to prevent blood return.

Preferably, the at least one through hole 51 is disposed at the bottom of the water storage tank 5, so that the liquid medicine stored in the water storage tank 5 can be completely discharged through the at least one through hole 51, thereby maximally Extend the time to prevent blood loss.

Preferably, the shape of the flow control plug 6 is cylindrical or polygonal. Of course, the formation of the flow control plug 6 can also be set to other shapes as long as the functions of the present invention can be realized.

In the embodiment of the present invention, at least one exhaust port 22 is further disposed on the upper cover 2, and a resistance covering the at least one exhaust port 22 is attached to the lower end surface of the upper cover 2. Water hydrophobic filter membrane 23.

Thus, it is possible to ensure that the gas in the entire filter can be smoothly discharged through the at least one exhaust port 22 without affecting the normal infusion. By sealing the at least one exhaust port 22 by the water-blocking hydrophobic filter membrane 23, it can be ensured that the liquid does not flow out from the at least one exhaust port 22 when the chemical liquid fills the filter, and During the process of filling the filter with the liquid medicine, the air pressure in the filter can be kept consistent with the atmospheric pressure when the filter is kept open to the outside air, thereby ensuring a stable drip rate of the liquid medicine.

Preferably, at least one notch is further disposed in the infusion channel and the outlet pipe 31, wherein the notch provided in the infusion channel can prevent the passage of air bubbles in the liquid medicine, and the outlet pipe 31 is The notch can not only prevent the passage of air bubbles in the liquid, but also maximize the flow of the liquid.

The specific working principle of the filter of the present invention is: the liquid medicine passes through the upper cover 2 of the filter After the inlet pipe 21 enters the barrel 1 , the air in the barrel 1 is pressed by the flow of the liquid medicine due to the infiltration of the liquid medicine to wet the liquid filtration membrane 4 . The water-blocking hydrophobic filter membrane 23 and the at least one exhaust port 22 on the cover 2 are discharged outward. When the liquid solution covers the entire water-repellent hydrophobic filter membrane 23, the liquid medicine cannot be discharged through the at least one exhaust port 22 due to the water-blocking action of the water-blocking hydrophobic filter membrane 23. At this time, the chemical solution breaks through the liquid-repellent filter membrane 4, and flows out of the filter through the outlet pipe 31 of the base 3, and flows to the intravenous needle of the medical infusion device to be normally infused.

When all the liquid medicines other than the water storage tank 5 in the barrel 1 are flowed through the infusion channel, and the liquid under the liquid stopping filter film 4 is automatically stopped, the residual medicine in the water storage tank The liquid will drip through the gap 7 formed between the flow control plug 6 and the through hole 51. Finally, the residual chemical liquid passes through the liquid stopping filter film 4 to continue the entire infusion process, thereby maintaining one The slow infusion state overcomes the venous pressure of the human body and effectively plays a role in preventing blood loss. At the same time, since the gap 7 formed between the through hole 51 and the flow control plug 6 can be irregularly arranged, the speed of the medicine droplets in the water storage tank 5 can be controlled, and the blood fall prevention can be extended. The effect of time.

Example 2

As shown in FIG. 4 and FIG. 5, the difference between the embodiment and the embodiment 1 is as follows: In the embodiment, the control plug 6 is provided with a slot 61 having a spacing of not more than 0.5 mm, and the control is performed. The remaining portion of the flow plug 6 except the slit 61 forms a sealing fit with the inner wall of the through hole 51. Thus, a gap can be formed between the slot 61 and the through hole 51. The residual liquid in the water storage tank 5 can flow out through the gap 7, and the entire infusion process is continued, thereby maintaining a slow infusion state to overcome the human venous pressure, and effectively preventing the same. The role of blood return.

Example 3

As shown in FIG. 6 and FIG. 7 , the difference between the embodiment and the embodiment 1 is that: in the embodiment, a slot 52 having a spacing of not more than 0.5 mm is disposed at an edge of the through hole 51, and the Control plug 6 forms a sealing fit with the remaining portion of the through hole 51 except the slot 52. Thus, a gap can be formed between the slot 52 and the flow control plug 6. The residual liquid in the water storage tank 5 can flow out through the slit 7, and the entire infusion process is continued, thereby maintaining a slow infusion state to overcome the human venous pressure, and effectively preventing the same. The role of blood return.

Example 4

As shown in FIG. 8 , the difference between the embodiment and the embodiment 1 is that: in the embodiment, at least one venting opening 11 is provided in the barrel 1 , and the venting opening 11 and the upper cover are The distance between 2 is an arbitrary value between one third and one half of the length of the barrel 1. The inner wall of the barrel 1 is affixed with water blocking covering the at least one vent hole 11. Hydrophobic filter membrane 12. Moreover, in the embodiment, the at least one exhaust port 22 is not provided on the tub body 1, and the water blocking hydrophobic filter membrane 23 is not provided.

Since the Murphy's tube requires that the liquid level therein does not exceed one-half to two-thirds of the total height of the Murphy's tube, in the present invention, the at least one exhaust gas is opened on the barrel 1. The hole 11, and the distance between the vent hole 11 and the upper cover 2 is an arbitrary value between one third and one half of the length of the tub 1. Thus, when the medicine drops into the filter, and when the liquid medicine in the filter does not reach the height of the at least one vent hole 11, due to the action of the liquid-repellent filter membrane 4, the medicine The liquid first presses the air in the filter and causes the liquid to flow out along the outlet pipe 31. Air is discharged through the at least one venting opening 11, and the medicinal liquid first fills the filter until the height of the at least one venting opening 11 is reached. After the chemical liquid completely wets the at least one vent hole 11 and the water-repellent hydrophobic filter membrane 12, the water-repellent hydrophobic filter membrane 12 attached to the inner wall of the barrel 1 causes the air to pass through again. The at least one vent hole 11 is discharged. The liquid medicine will continue to drip into the filter until the air pressure in the filter plus the gravity of the liquid medicine itself causes the liquid medicine to overcome the resistance of the liquid stopping filter film 4, so that the medicine drops down, and It is possible to maintain the liquid level at a position of one-half to two-thirds of the total height of the tub 1 in accordance with the standard of the Murphy's tube, thereby enabling the filter of the present invention to directly function as Murphy Tube use.

Example 5

As shown in FIG. 9, the difference between the embodiment and the embodiment 1 is that: in the embodiment, the filter further includes a hollow conduit 9 inserted into the interior of the barrel 1 from the upper cover, the hollow The distance between the bottom of the duct 9 and the upper cover 2 is one-third to one-half of the length of the tub 1. The inside of the hollow duct 9 is provided with a water-repellent hydrophobic filter membrane 91.

When a drug is dropped into the filter, and when the drug solution in the filter does not reach the height of the at least one vent hole 11, due to the action of the liquid-repellent filter membrane 4, the drug solution The air in the filter is first squeezed and the liquid does not flow out along the outlet pipe 31. The air will be discharged through the hollow conduit 9, and after the liquid reaches the bottom of the hollow conduit 9, it will continue to rise along the hollow conduit 9 to the water-blocking hydrophobic filter membrane 91 if the water-blocking The hydrophobic filter membrane 91 is disposed at the bottom of the hollow conduit 9, and after the chemical liquid wets the water-blocking hydrophobic filter membrane 91 at the bottom of the hollow conduit 9, the air can no longer be led out through the hollow conduit 9. The liquid medicine will continue to drip into the filter until the air pressure in the filter plus the gravity of the liquid medicine itself causes the liquid medicine to overcome the resistance of the liquid stopping filter film 4, so that the medicine drops down, and The ability to maintain the liquid level at a position of one-half to two-thirds of the total height of the tub 1 conforms to the standard of the Murphy's tube, and also enables the filter of the present invention to be directly used as a Murphy tube .

Of course, in the present embodiment, the barrel is specifically manufactured using a soft material such as PVC, so that the barrel 1 can be manually set to an arbitrary shape, so that the barrel can be entered when the liquid enters the barrel 1. The air in 1 is discharged, and the liquid level of the liquid medicine in the barrel can also be maintained at a level not exceeding one-half to two-thirds of the total height of the barrel 1, so that the barrel is the same Can be used as a Murphy tube.

Example 6

As shown in FIG. 10 and FIG. 11 , the difference between the embodiment and the embodiment 1 is that, in the embodiment, the filter further includes at least one water inlet channel and at least one exhaust channel, which are specific to the embodiment. During implementation, the filter includes a water inlet passage 15 and an exhaust passage 16. among them, While the chemical liquid enters the filter, the air between the filter inner liquid filtration membrane 4 and the water storage tank 5 can be discharged through the exhaust passage 16, and the liquid medicine in the filter is also firstly The water inlet passage 15 flows down. Of course, the water inlet channel and the exhaust channel can also be realized by other means as long as the corresponding functions can be satisfied.

In addition, in the present embodiment, the tub 1 is also used as the water storage tank 5, and a portion of the tub 1 having a height lower than the height of the water inlet pipe 15 can be used as the water storage tank 5. .

Preferably, at least one notch is further disposed in the water inlet pipe and the water outlet pipe 31, wherein the notch provided in the infusion channel can prevent air bubbles in the liquid medicine from passing through, and the water outlet pipe 31 is The notch can not only prevent the passage of air bubbles in the liquid, but also maximize the flow of the liquid. 12 is a cross-sectional view taken along line A-A of the outlet pipe 31 of FIG. 11, and the notch provided in the outlet pipe 31 can be shown in FIG.

Example 7

As shown in FIG. 13 and FIG. 14 , the difference between the embodiment and the embodiment 1 is that, in the embodiment, the control plug 6 is further provided with at least one filter film 8 , and the filter film 8 is The through holes 51 are tightly fitted. The at least one filter membrane 8 is sleeved on the flow control plug 6, and the filter membrane 8 is closely matched with the through hole 51, so that the chemical liquid passes through the at least one layer of filtration when dripping The membrane 8 further delays the time under the droplet of the drug, which in turn prolongs the time to prevent blood return.

By adjusting the area of the at least one filter membrane 8 and the thickness of the filter membrane 8, the speed of the liquid medicine flowing in the water storage tank 5 can be specifically controlled, and the effect of controlling the anti-return time can be adjusted. .

The filter membrane 8 may be a hydrophilic filter membrane (ie, a permeable membrane), and specifically, an annular fiber membrane having an inner diameter of greater than or equal to 1 mm may be used. Of course, the filtration membrane 8 can also be a nylon membrane or a polyethersulfone membrane. Preferably, however, the weight of the annular fiber membrane per square meter may be set to be greater than or equal to 50 g, and in the present embodiment, preferably 90 g. At the same time, the filter membrane 8 It may be sleeved on the flow plug or bonded to the edge of the through hole to achieve a close fit with the through hole 51. The filter film 8 can be specifically made of a fiber membrane generally used in the medical field, and the specific types thereof will not be described herein.

Example 8

As shown in FIG. 15 , the difference between the embodiment and the embodiment 4 is as follows: In the embodiment, the control plug 6 is further provided with at least one filter film 8 , and the filter film 8 and the pass The holes 51 are closely fitted. The at least one filter membrane 8 is sleeved on the flow control plug 6, and the filter membrane 8 is closely matched with the through hole 51, so that the chemical liquid passes through the at least one layer of filtration when dripping The membrane 8 further delays the time under the droplet of the drug, which in turn prolongs the time to prevent blood return.

Example 9

As shown in FIG. 16 , the difference between the embodiment and the embodiment 5 is that: in the embodiment, the control plug 6 is further provided with at least one filter film 8 , and the filter film 8 and the pass The holes 51 are closely fitted. The at least one filter membrane 8 is sleeved on the flow control plug 6, and the filter membrane 8 is closely matched with the through hole 51, so that the chemical liquid passes through the at least one layer of filtration when dripping The membrane 8 further delays the time under the droplet of the drug, which in turn prolongs the time to prevent blood return.

Example 10

As shown in FIG. 17 and FIG. 18, the difference between the embodiment and the embodiment 6 is that, in the embodiment, at least one filter film 8 is further disposed on the control plug 6, and the filter film 8 is The through holes 51 are tightly fitted. The at least one filter film 8 is sleeved on the flow control plug 6, and the filter film 8 is closely matched with the through hole 51, so that the liquid medicine passes through the at least one time when dropping The layer filtration membrane 8 further delays the time under the drug droplets, thereby prolonging the time for preventing blood return.

Example 11

As shown in FIG. 19, the medical infusion set of the present embodiment includes a stopper stopper 62, a Murphy tube 63, a flow rate adjuster 64, and a venous needle 65 which are sequentially connected by an infusion hose 61, and further includes any one of the above In the filter described in the embodiment, the filter is connected in series between the Murphy tube 63 and the flow rate adjuster 64 through an infusion hose 61, and the vertical height of the medical infusion set as a whole is high. The medical infusion set of the embodiment has an anti-return function when the vertical height position of the venous pressure at any position of the human body at the time of infusion is provided, and the time for controlling the anti-return blood can be adjusted.

Example 12

As shown in FIG. 20, the difference between this embodiment and the embodiment 11 is that: in the embodiment, the filter is connected in series to the cork puncturer 62 and the Murphy tube 63 through an infusion hose 61. Between the above, the vertical height of the medical infusion device is higher than the vertical height of the venous pressure at any position of the human body during infusion, so that the medical infusion device of the embodiment has the function of preventing blood return, and can adjust and control the blood return prevention. time.

Example 13

As shown in FIG. 21, the medical infusion set of the present embodiment includes a stopper puncturing device 62 which is sequentially connected by an infusion hose 61, a filter as described in Embodiment 4 or Embodiment 5, which is used as a Murphy tube, and a flow rate. The regulator 64 and the venous needle 65, and the vertical height of the medical infusion device as a whole is higher than the vertical height of the venous pressure at any position of the human body at the time of infusion. The filter of the embodiment 4, the embodiment 5 or the embodiment 9 can be used as a Murphy tube, and the medical infusion device of the embodiment can be prevented from returning blood, and the blood return prevention can be adjusted. time.

Although the specific embodiments of the present invention have been described above, those skilled in the art should The present invention is to be considered as illustrative only, and various changes and modifications may be made to these embodiments without departing from the spirit and scope of the invention. Accordingly, the scope of the invention is defined by the appended claims.

Claims

Rights request

1. A filter with controllable time for preventing blood return on a medical infusion set, including a barrel. The filter also includes a storage tank located inside the barrel and storing residual medicinal liquid for preventing blood return. And an infusion channel for conventional infusion and with an automatic liquid-stopping function; It is characterized in that the water storage tank is provided with at least one through hole, and a tightly fitting flow control plug is snapped into each of the through holes. , a gap is formed between the outer edge of the flow control plug and the edge of the through hole, so that the residual medicinal solution drips through the gap at a speed that prevents blood backflow and the flow control plug is placed in the through hole. Inside.

2. The filter according to claim 1, wherein the water storage tank is suspended and fixed inside the barrel; preferably, the water storage tank is fixed to the upper half of the barrel.

3. The filter according to claim 1, wherein the infusion channel is a tubular infusion pipe, and the water storage tank is a part of the barrel whose height is lower than the height of the infusion pipe.

4. The filter according to any one of claims 1 to 3, characterized in that the maximum spacing of the gaps is less than or equal to 1 mm; preferably, the maximum spacing of the gaps is less than or equal to 0.5 mm.

5. The filter according to any one of claims 1 to 4, characterized in that the at least one through hole is provided at the bottom of the water storage tank.

6. The filter according to any one of claims 1 to 5, characterized in that the shape of the flow control plug is cylindrical or polygonal.

7. The filter according to any one of claims 1 to 6, wherein the filter further includes at least one layer of permeable filtration membrane covering the gap; preferably, the permeable filtration membrane The membrane is an annular permeable filtration membrane; preferably, the permeable filtration membrane is a hydrophilic filtration membrane; more preferably, the permeable filtration membrane is an annular fiber membrane with an inner diameter greater than or equal to 1 mm; still more preferably Specifically, the weight of the permeable filtration membrane per square meter is greater than or equal to 50g.

8. The filter according to claim 7, wherein the at least one layer of permeable fiber membrane is set on the flow control plug or bonded to the edge of the through hole.

9. The filter according to any one of claims 1 to 8, characterized in that, the filter further includes an upper cover and a base that are closely matched with the barrel, and the upper cover is provided with a There is a water inlet pipe and a water outlet pipe is provided on the base; preferably, a liquid-stop hydrophilic filter membrane for automatic liquid-stopping is attached to the liquid outlet surface of the infusion channel; even better Furthermore, the infusion channel and the water outlet pipe are respectively provided with at least one slot to prevent the passage of air bubbles.

10. The filter according to claim 9, wherein at least one exhaust port is provided on the upper cover, and a water-blocking water barrier covering the at least one exhaust port is attached to the lower end surface of the upper cover. Hydrophobic filter membrane.

11. The filter according to claim 9 or 10, characterized in that at least one exhaust hole is provided on the barrel, and the distance between the exhaust hole and the upper cover is One-third to one-half of the length of the barrel, and a water-blocking and hydrophobic filter membrane covering the at least one exhaust hole is attached to the inner wall of the barrel.

12. The filter according to any one of claims 9 to 11, characterized in that, the filter further includes a hollow conduit inserted into the barrel from the upper cover, and the bottom of the hollow conduit The distance from the upper cover is one-third to one-half of the length of the barrel, and a water-blocking and hydrophobic filter membrane is provided inside the hollow conduit.

13. The filter according to any one of claims 1 to 12, characterized in that the barrel is made of soft material.

14. A medical infusion set, characterized in that it includes the filter according to any one of claims 1-13.

15. A medical infusion set, characterized in that it includes the filter as described in any one of claims 11-13 as a Murphy's tube.