CN219423416U

CN219423416U - Flushing device for ECMO reverse perfusion tube

Info

Publication number: CN219423416U
Application number: CN202223268224.XU
Authority: CN
Inventors: 张浦; 肖乐; 李汉青
Original assignee: Zhongnan Hospital of Wuhan University
Current assignee: Zhongnan Hospital of Wuhan University
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-07-28
Anticipated expiration: 2032-12-07

Abstract

The flushing device for the ECMO reverse perfusion tube comprises a positive pressure liquid bag and a flushing tube, wherein the bottom of the positive pressure liquid bag is connected with a perfusion tube, and a pressing switch is arranged on the perfusion tube; the middle part of the flushing pipe is communicated with a back flushing ball; the bottom end of the flushing pipe extends to the inside of the back flushing ball, an elastic sealing piece capable of being opened downwards is obliquely arranged at the port of the flushing pipe, and a filter screen for filtering thrombus is arranged in the back flushing ball; the top of the back flushing ball is communicated with the atmosphere and provided with an exhaust hole, and a membrane flap which only allows gas to permeate is paved in the exhaust hole. The utility model uses the flushing liquid with positive pressure to flush back the filtered blood in the back flushing ball and the lower flushing pipe, and flushes the reverse perfusion pipe, keeps the reverse perfusion pipe smooth, avoids frequent back pumping and flushing pipe operation by adopting the injector, reduces nursing workload, and avoids multiple exposure of the interface of the reverse perfusion pipe in the air and blood flow infection.

Description

Flushing device for ECMO reverse perfusion tube

Technical Field

The utility model relates to the technical field of medical appliances, in particular to a flushing device for an ECMO reverse perfusion tube.

Background

External membrane oxygenation (ECMO) is one of the most powerful rescue tools at present, and has great supporting effect on heart and lung in critical patient rescue process. The main modes of ECMO are VV (venous to venous) mode and VA (venous to arterial) mode. Wherein, the VA mode is to drain blood from veins, exchange oxygen through membrane lungs and then return from arterial ends to the body so as to achieve the purpose of treatment.

During the VA-ECMO creation procedure, an arterial cannula is required to be placed into the arterial system. Because ECMO flow demand is big, therefore arterial cannula is thicker, leads to the intubate to be very little with the gap between the artery after putting into the intubate, and the blood flow is through inadequately, can lead to the lower limb arterial blood supply that femoral artery intubate department is far away in some patients to be insufficient, can seriously lead to limbs necrosis, needs amputation to handle. In order to avoid the phenomenon, a small arterial cannula is often placed in the femoral arterial cannula far away in clinic so as to ensure the blood supply of the distal limb and avoid the ischemic necrosis of the limb. The reverse perfusion tube used at present is usually thinner, the blood flow is smaller, and the existence of thrombus in the reverse perfusion tube needs to be dynamically checked and the reverse perfusion tube needs to be flushed to ensure the smoothness of the reverse perfusion tube, but the frequent syringe back-pumping and tube flushing operation increases the nursing operation workload and the exposure times of the interface in the air and the chance of causing blood flow infection.

Disclosure of Invention

In order to solve the problems, the utility model provides a flushing device for an ECMO reverse perfusion tube, which comprises the following specific technical scheme:

the flushing device for the ECMO reverse perfusion tube comprises a positive pressure liquid bag and a flushing tube, wherein flushing liquid higher than the pressure of an ECMO system is pre-filled in the positive pressure liquid bag, the bottom of the flushing liquid bag is connected with a perfusion tube, and a pressing switch is arranged on the perfusion tube; the middle part of the flushing pipe is communicated with a back flushing ball, the flushing pipe is divided into an upper flushing pipe and a lower flushing pipe, and the upper flushing pipe and the lower flushing pipe are detachably connected with the infusion pipe and the reverse perfusion pipe respectively; the bottom end of the upper flushing pipe extends to the inside of the back flushing ball, an elastic sealing piece capable of being opened downwards is obliquely arranged at the port of the upper flushing pipe, and a filter screen for filtering thrombus is arranged in the back flushing ball; the top of the back flushing ball is communicated with the atmosphere and provided with an exhaust hole, and a membrane flap which only allows gas to permeate is paved in the exhaust hole.

Further, the flushing pipe is communicated with the right side part of the back flushing ball.

Further, the peripheral rings of the elastic sealing sheets extend outwards from the port at the bottom end of the upper flushing pipe.

Further, the filter screen includes first filter screen and second filter screen, first filter screen sets up in the interior bottom of back flush ball along the inboard vertical upwards of lower flushing pipe, and its top extends to the well upper portion in the back flush ball, the bottom of second filter screen is connected in the well upper portion of first filter screen, and its top is connected in the inner wall of well upper portion in the back flush ball with upwards slope.

Further, the inner bottom of the back flushing ball is obliquely arranged towards the opening communicated with the lower flushing pipe.

Further, push switch includes sleeve, traveller and depression bar, the sleeve sets up perpendicularly on the transfer line, and is provided with the passageway that supplies the flushing fluid to circulate in it, the traveller movably sets up the left end in the sleeve, and has seted up the water conservancy diversion hole that is used for the flushing fluid to circulate on the traveller, the depression bar is slidably inserted in the sleeve and is connected with the left end of traveller, the right-hand member in the sleeve is provided with the reset spring that offsets with the traveller, reset spring's initial elasticity makes the transfer line be in by the state of traveller shutoff.

Further, a limiting block used for limiting the diversion hole to move to a circulation state is arranged at the right end in the sleeve.

Further, the exhaust hole extends outwards along the tangent line at the top of the back flushing ball and faces to the right.

Further, one end of the upper flushing pipe, which is close to the infusion pipe, is provided with a one-way valve.

Further, the upper flushing pipe and the lower flushing pipe are respectively connected with the infusion pipe and the reverse perfusion pipe by screw threads.

The beneficial effects are that:

the utility model uses the pressure of the ECMO system to flush thrombus collected in the reverse perfusion tube into the back flushing ball, collects and filters the thrombus through the filter screen, and then uses the flushing fluid with positive pressure to flush back the blood in the filtered back flushing ball and the lower flushing tube, and flushes the reverse perfusion tube, thereby keeping the reverse perfusion tube smooth, avoiding frequent back pumping and flushing operation by a syringe, reducing nursing workload, and avoiding multiple exposure of the interface of the reverse perfusion tube in the air and blood flow infection.

Drawings

Fig. 1 is an overall schematic of the present utility model.

FIG. 2 is a schematic view of a backwash ball of the present utility model.

Fig. 3 is a schematic diagram of an initial state of the push switch of the present utility model.

Fig. 4 is a schematic view of a use state of the push switch of the present utility model.

In the figure: 1 positive pressure liquid bag, 2 infusion tube, 3 press switch, 31 sleeve, 32 slide column, 33 compression bar, 34 guide hole, 35 reset spring, 36 limit block, 4 flushing tube, 41 upper flushing tube, 42 lower flushing tube, 5 elastic sealing piece, 6 back flushing ball, 61 exhaust hole, 62 membranous flap, 63 first filter screen, 64 second filter screen, 7 check valve.

Detailed Description

The utility model is further described with reference to the accompanying drawings and specific embodiments:

as shown in fig. 1 to 4, a flushing device for an ECMO reverse perfusion tube comprises a positive pressure liquid bag 1 and a flushing tube 4, wherein flushing liquid higher than the pressure of an ECMO system is pre-filled in the positive pressure liquid bag 1, the bottom of the flushing liquid bag is connected with a perfusion tube 2, and a pressing switch 3 is arranged on the perfusion tube 2; the middle part of the flushing pipe 4 is provided with a back flushing ball 6 in a communicating way, the flushing pipe 4 is divided into an upper flushing pipe 41 and a lower flushing pipe 42, and the upper flushing pipe 41 and the lower flushing pipe 42 are respectively detachably connected with the infusion pipe 2 and the reverse perfusion pipe; the bottom end of the upper flushing pipe 41 extends to the inside of the back flushing ball 6, an elastic sealing piece 5 which can be opened downwards is obliquely arranged at the port of the upper flushing pipe, and a filter screen for filtering thrombus is arranged in the back flushing ball 6; the top of the back flushing ball 6 is provided with a vent hole 61 communicated with the atmosphere, and a membrane flap 62 which only allows gas to permeate is paved in the vent hole 61.

Preferably, the upper flushing pipe 41 and the lower flushing pipe 42 are respectively connected with the infusion pipe 2 and the reverse pouring pipe by screw threads, so that the disassembly and connection of the flushing pipe 4 are convenient.

Since the reverse perfusion tube itself is a threaded interface, the bottom end of the lower flush tube 42 is provided with a threaded port to which it can be connected; the direct connection between the upper flushing pipe 41 and the infusion tube 2 is not limited to the threaded connection, and may be a snap-fit connection with a gasket.

In one embodiment, the backwash ball 6 is made of transparent material, so that the working condition inside the backwash ball can be conveniently observed.

In one embodiment, the positive pressure liquid bag 1 has a volume of 500ml, and the pre-filled pressure is not less than 300mmHg, so that the pressure can be kept higher than the pressure in the ECMO system all the time when the liquid bag is flushed; the positive pressure liquid bag 1 is provided with a filling opening for filling flushing liquid and pressurizing.

As shown in fig. 1 and 2, the flushing pipe 4 is provided in communication with the right side of the backwash ball 6.

In one embodiment, the circumference of the elastic sealing piece 5 extends upwards to the outside of the port at the bottom end of the flushing pipe 41. The elastic sealing piece 5 can be made of hundred-fold glue with certain elastic force, and the initial state of the elastic sealing piece is in a state of closing the bottom end of the upper flushing pipe 41. The ECMO pipeline is internally provided with a certain pressure, and when the reverse perfusion tube is opened, the blood with pressure in the ECMO pipeline can enter the backwash ball 6 along the lower flushing tube 42, so that the blood with pressure impacts the elastic sealing piece 5; the elastic sealing piece 5 is designed to be larger than the bottom end of the upper flushing pipe 41, so that the elastic sealing piece 5 can be prevented from being impacted to be embedded into the upper flushing pipe 41.

In addition, the port at the bottom end of the upper flushing pipe 41 is arranged to be similar to the inner arc surface of the back flushing ball 6 in an inclined plane, so that the blood with pressure flows to the bottom surface of the elastic sealing piece 5 along the arc-shaped inner wall of the back flushing ball 6, and the upward and leftward inclined impact is maintained.

As shown in fig. 2, the filter screen includes a first filter screen 63 and a second filter screen 64, the first filter screen 63 is vertically disposed upward at the inner bottom of the backwash ball 6 along the inner side of the lower flushing pipe 42, and the top end thereof extends to the middle upper portion in the backwash ball 6, the bottom end of the second filter screen 64 is connected to the middle upper portion of the first filter screen 63, and the top end thereof is connected to the inner wall of the middle upper portion of the backwash ball 6 in an upward inclined manner.

Because the lower flushing pipe 42 is arranged close to the right inner wall of the back flushing ball 6, the blood with pressure is flushed to the left inner wall along the bottom surface of the elastic sealing piece 5 and then falls back onto the second filter screen 64, and part of the blood flows through the upper part of the first filter screen 63, so that thrombus in the blood can be filtered; the filtered blood enters the bottom of the backwash ball 6 and then enters the ECMO system again with the flushing fluid from the lower part of the first screen 63.

In one embodiment, to ensure that filtered blood flows back into the ECMO system, the inner bottom of the backwash ball 6 is inclined toward the opening communicating with the down flush tube 42.

As shown in fig. 3 and 4, the push switch 3 includes a sleeve 31, a sliding column 32 and a pressing rod 33, the sleeve 31 is vertically disposed on the infusion tube 2, a channel through which the flushing fluid flows is disposed in the sleeve, the sliding column 32 is movably disposed at the left end in the sleeve 31, a diversion hole 34 for the flushing fluid to flow is formed in the sliding column 32, the pressing rod 33 is slidably inserted into the sleeve 31 and connected with the left end of the sliding column 32, a return spring 35 that abuts against the sliding column 32 is disposed at the right end in the sleeve 31, and the initial elastic force of the return spring 35 makes the infusion tube 2 be in a state of being blocked by the sliding column 32.

In the initial state, the right end of the sliding column 32 is used for plugging the infusion tube 2, and the diversion hole 34 and the infusion tube 2 are in a dislocation plugging state. When the flushing liquid in the positive pressure liquid bag 1 is required to be flushed, the pressure lever 33 is pressed to the right by hand, the pressure lever 33 pushes the slide column 32 to squeeze the reset spring 35, so that the flow guide hole 34 is opposite to the infusion tube 2, and the flushing liquid is flushed out of the positive pressure liquid bag 1, flows through the infusion tube 2 and the upper flushing tube 41, flows into the backwashing ball 6 after the elastic sealing piece 5 is flushed, and backflushes the reverse pouring tube after flowing through the lower flushing tube 42; after the flushing is completed, the pressing rod 33 is loosened, the sliding column 32 is reset under the action of the elastic force of the reset spring 35, and the diversion hole 34 and the infusion tube 2 are restored to the blocking state, so that the flushing liquid is cut off.

Preferably, a limiting block 36 for limiting the flow guide hole 34 to just move to a circulation state is arranged at the right end in the sleeve 31; the limiting block 36 is used for positioning, so that the compression bar 33 pushes the sliding column 32 to prop against the limiting block 36, and the diversion hole 34 at the moment is opposite to the infusion tube 2, so that the phenomenon that the diversion hole 34 is misplaced with the infusion tube 2 to influence flushing operation is avoided.

In one embodiment, the air vent 61 extends outward along the tangent line of the top of the back-flushing ball 6 and faces to the right, so as to reduce the pressurized blood flowing to the left side wall of the back-flushing ball 6 from entering the air vent 61 and avoid the damage to the membrane flap 62.

Wherein the membrane flap 62 may be a waterproof breathable membrane, including but not limited to PTFE membranes and the like.

In one embodiment, the end of the upper flushing pipe 41, which is close to the infusion pipe 2, is provided with a one-way valve 7, and the one-way valve 7 can avoid the failure of the elastic sealing piece 5, or the upward reverse channeling of blood and the pollution to the infusion pipe 2 after the reverse channeling of blood occur when the pressure in the positive pressure liquid bag 1 is low during the flushing operation.

In use, the lower flushing pipe 42 is connected with the reverse perfusion pipe, and the upper flushing pipe 41 is connected with the infusion pipe 2. Opening a reverse perfusion tube, backflushing blood with pressure in an ECMO pipeline into a backflushing ball 6, and intercepting and filtering thrombus carried out of the blood through a filter screen; pressing the pressing rod 33 again to enable flushing liquid in the positive pressure liquid bag 1 to push towards the reverse pouring pipe, flushing back the filtered blood in the backwash ball 6 and the blood in the lower flushing pipe 42, flushing the reverse pouring pipe and keeping the smoothness of the reverse pouring pipe; after the flushing is finished, the reverse pouring pipe is closed, then the compression bar 33 is loosened, the flushing pipe 4 is detached, discarded, and then the positive pressure liquid bag 1 is filled with the flushing liquid and punched for standby.

Claims

1. A flushing device for an ECMO reverse perfusion tube, characterized by: the device comprises a positive pressure liquid bag and a flushing pipe, wherein flushing liquid higher than the pressure of an ECMO system is pre-filled in the positive pressure liquid bag, the bottom of the positive pressure liquid bag is connected with a perfusion tube, and a pressing switch is arranged on the perfusion tube; the middle part of the flushing pipe is communicated with a back flushing ball, the flushing pipe is divided into an upper flushing pipe and a lower flushing pipe, and the upper flushing pipe and the lower flushing pipe are detachably connected with the infusion pipe and the reverse perfusion pipe respectively; the bottom end of the upper flushing pipe extends to the inside of the back flushing ball, an elastic sealing piece capable of being opened downwards is obliquely arranged at the port of the upper flushing pipe, and a filter screen for filtering thrombus is arranged in the back flushing ball; the top of the back flushing ball is communicated with the atmosphere and provided with an exhaust hole, and a membrane flap which only allows gas to permeate is paved in the exhaust hole.

2. A flushing device for ECMO reverse perfusion tubes as claimed in claim 1, wherein: the flushing pipe is communicated with the right side part of the back flushing ball.

3. A flushing device for ECMO reverse perfusion tubes as claimed in claim 2, wherein: the circumference of the elastic sealing piece extends outwards from the port at the bottom end of the upward flushing pipe.

4. A flushing device for ECMO reverse perfusion tubes as claimed in claim 2, wherein: the filter screen comprises a first filter screen and a second filter screen, wherein the first filter screen is vertically upwards arranged at the inner bottom of the back flushing ball along the inner side of the lower flushing pipe, the top end of the first filter screen extends to the middle upper part in the back flushing ball, the bottom end of the second filter screen is connected to the middle upper part of the first filter screen, and the top end of the second filter screen is upwards connected to the inner wall of the middle upper part of the back flushing ball in an inclined manner.

5. A flushing device for ECMO reverse perfusion tubes as claimed in claim 2, wherein: the inner bottom of the back flushing ball is obliquely arranged towards the opening communicated with the lower flushing pipe.

6. A flushing device for ECMO reverse perfusion tubes as claimed in claim 1, wherein: the push switch comprises a sleeve, a sliding column and a pressing rod, wherein the sleeve is vertically arranged on the infusion tube, a channel for flushing fluid to circulate is arranged in the sleeve, the sliding column is movably arranged at the left end in the sleeve, a guide hole for flushing fluid to circulate is formed in the sliding column, the pressing rod is slidably inserted into the sleeve and is connected with the left end of the sliding column, a reset spring propped against the sliding column is arranged at the right end in the sleeve, and the infusion tube is in a state blocked by the sliding column due to initial elasticity of the reset spring.

7. A flushing device for ECMO reverse perfusion tubes as claimed in claim 6, wherein: the right end in the sleeve is provided with a limiting block for limiting the diversion hole to move to a circulation state just in time.

8. A flushing device for ECMO reverse perfusion tubes as claimed in claim 1, wherein: the exhaust hole extends outwards along the tangent line at the top of the back flushing ball and faces to the right.

9. A flushing device for ECMO reverse perfusion tubes as claimed in claim 1, wherein: one end of the upper flushing pipe, which is close to the infusion pipe, is provided with a one-way valve.

10. A flushing device for ECMO reverse perfusion tubes as claimed in claim 1, wherein: the upper flushing pipe and the lower flushing pipe are respectively connected with the infusion pipe and the reverse perfusion pipe by screw threads.