CN107802906B - Blood purifying system - Google Patents
Blood purifying system Download PDFInfo
- Publication number
- CN107802906B CN107802906B CN201711167129.1A CN201711167129A CN107802906B CN 107802906 B CN107802906 B CN 107802906B CN 201711167129 A CN201711167129 A CN 201711167129A CN 107802906 B CN107802906 B CN 107802906B
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- pipeline
- blood
- communicated
- reversing device
- blood flow
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
- A61M1/1621—Constructional aspects thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
- A61M1/1601—Control or regulation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2202/00—Special media to be introduced, removed or treated
- A61M2202/04—Liquids
- A61M2202/0413—Blood
Abstract
The invention discloses a blood purification system, which belongs to the field of blood treatment equipment and comprises a blood purification device and a blood flow reversing device, wherein a blood inlet end and a blood outlet end of the blood purification device are respectively connected with a pipeline A and a pipeline B, and also comprise a pipeline C and a pipeline D which are connected with a patient, and the pipeline A, the pipeline B, the pipeline C and the pipeline D are respectively communicated with the blood flow reversing device; when the blood flow reversing device is in a state, the pipeline A is communicated with the pipeline C, and the pipeline B is communicated with the pipeline D; when the blood flow reversing device is in the other state, the pipeline A is communicated with the pipeline D, the pipeline B is communicated with the pipeline C, the pipeline C and the pipeline D are both connected with branch pipes, and the branch pipes are provided with covers. The invention can quickly realize blood flow reversing, effectively avoid thrombosis, avoid infection, reduce purification time, improve nursing efficiency, and simultaneously facilitate the operations of medicine supplementing, blood drawing and sampling.
Description
Technical Field
The invention relates to the field of blood treatment equipment, in particular to a blood purification system.
Background
Blood purification techniques, the most prominent treatment modality for acute or chronic renal failure, are implemented on the premise that an unobstructed vascular access must be established for the patient. Epidemiologically, hemodialysis double-lumen catheters are one of the most common vascular access for acute or chronic renal failure, and two blood flow channels are formed by the double-lumen catheters. However, during the course of treatment, blood flow is often not properly directed out of the body or back into the body due to the double lumen catheter, resulting in an unexpected termination of the blood purification treatment. Clinicians often achieve the goal of continuing treatment by attempting to adjust the connection of the vascular access, most often by reversing the tubing to change its direction of blood flow so that the blood flow is again smoothly running. There are some clinical problems and medical hazards in time manipulation, such as: 1. the blood purification treatment is suspended for a long time (5-30 min), and the treatment effect of a patient can be adversely affected; 2. the procedure is open, and the blood of the patient is exposed outside the lumen or in the air for a long time, so that the risk of iatrogenic infection and thrombosis exists; 3. since the blood pump of the blood purification machine is in a stopped state during operation, blood in the lumen of the catheter is prone to thrombus formation and spread along the lumen for prolonged operation time, even leading to deep vein thrombosis of the patient and possibly causing an embolic event; 4. in the actual treatment process, the reverse connection may need to be repeated, so that the operation intensity of nursing becomes high, and great waste of manpower resource cost is caused.
In addition, in the blood purification treatment process, a channel is often required to be additionally established for supplementing the liquid medicine or sampling blood, and a tee joint is often required to be connected to the outlet end of the double-cavity catheter. But this approach can lead to potential medical hazards: 1. the connection of the tee joint is easy to loosen, so that blood and liquid overflow is caused, and even serious adverse events are caused by disconnection; 2. the liquid outflow caliber of the tee joint is far smaller than that of the double-cavity catheter, so that the blood shearing force is easily increased, and thrombus is easily formed; 3. the handling strength of care increases and iatrogenic infections are easily caused.
Disclosure of Invention
The invention aims to provide a blood purification system which can solve the problems existing in the process of reverse connection of pipelines, effectively avoid thrombosis, avoid infection, reduce purification time and improve nursing efficiency.
In order to achieve the above purpose, the invention adopts the following technical scheme: the blood purification system comprises a blood purification device and a blood flow reversing device, wherein a blood inlet end and a blood outlet end of the blood purification device are respectively connected with a pipeline A and a pipeline B, and the blood purification system also comprises a pipeline C and a pipeline D which are connected with a patient, and the pipeline A, the pipeline B, the pipeline C and the pipeline D are respectively communicated with the blood flow reversing device; when the blood flow reversing device is in a state, the pipeline A is communicated with the pipeline C, and the pipeline B is communicated with the pipeline D; when the blood flow reversing device is in the other state, the pipeline A is communicated with the pipeline D, and the pipeline B is communicated with the pipeline C.
Further, the pipeline C and the pipeline D are connected with branch pipes, and the branch pipes are provided with covers.
Preferably, the blood flow reversing device is a rotary reversing device and comprises a body part, the top surface of the body part is provided with a blind hole, the side wall of the blind hole is provided with a circle of groove along the circumferential direction of the blind hole, the side wall of the body part is provided with four interfaces, the four interfaces are communicated with the groove, and the four interfaces are respectively positioned in four quadrants of the same coordinate system; the blind hole is internally provided with a core part, the core part is rotationally connected with the body part, the side wall of the core part is provided with two opposite bulges, and the bulges are matched with the grooves.
Further, a knob is arranged at the top of the core part.
Further, the knob is in sliding connection with the core, a sliding groove is formed in the top of the core, the knob is matched with the sliding groove, and the sliding groove penetrates through the side wall of the core and extends to the top surface of the body.
Further, sealing elements are arranged between the blind holes and the core part and between the protrusions and the grooves.
Preferably, the blood flow reversing device is a rotary reversing device and comprises a first body and a second body, wherein the end face of the first body is provided with a fixed shaft, the end face of the second body is provided with a shaft hole matched with the fixed shaft, the end face of the first body and the end face of the second body are connected through the fixed shaft in a mutually rotating way, the end face of the first body is provided with a through hole a and a through hole b, the end face of the second body is provided with a through hole c and a through hole d, the through holes a, b, c and d are all parallel to the fixed shaft, and the rotation radiuses of the through holes a, b, c and d are equal.
Further, a handle is arranged on the side wall of the first body and/or the side wall of the second body.
The second body is provided with a pin shaft, two pin holes matched with the pin shaft are formed in the end face of the first body, the pin shaft penetrates through the second body, and the two pin holes are symmetrically arranged about the fixed shaft.
Further, two sealing rings are arranged on the end face of the first body and are concentric with the through hole a and the through hole b respectively, and the diameters of the two sealing rings are larger than the diameter of the through hole a and the diameter of the through hole b respectively.
Preferably, the blood flow reversing device comprises a connecting pipe a, a connecting pipe B, a connecting pipe C and a connecting pipe D, wherein the pipeline A is communicated with the pipeline C and the pipeline D through the connecting pipe a and the connecting pipe B, the pipeline B is communicated with the pipeline C and the pipeline D through the connecting pipe C and the connecting pipe D, and flow stopping clamps are arranged on the connecting pipe a, the connecting pipe B, the connecting pipe C and the connecting pipe D.
Preferably, the blood purification device is a blood purification machine.
Preferably, the pipeline C and the pipeline D are two branch pipelines of the same double-cavity catheter.
The beneficial effects of the invention are as follows:
1. the blood reversing device can effectively solve the risks of thrombosis and infection in the reverse connection process of the pipeline, and has the effects of reducing the purification time and improving the nursing efficiency;
2. the branch pipes and the cover are arranged, so that the functions of convenient medicine supplementing and blood sampling are realized;
3. the arrangement of the blood reversing device with rotary reversing has the functions of further improving nursing efficiency and reducing purifying time.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural diagram of a blood flow reversing device according to the first embodiment;
FIG. 3 is view A-A of FIG. 2;
FIG. 4 is a schematic diagram illustrating a blood flow reversing device according to the first embodiment;
fig. 5 is a schematic structural diagram of a blood flow reversing device according to a second embodiment;
FIG. 6 is a schematic diagram illustrating a blood flow reversing device according to a second embodiment;
fig. 7 is a schematic structural diagram of a blood flow reversing device according to the third embodiment.
In the figure: 1-blood purification device, 2-blood switching-over device, 3-pipeline A, 4-pipeline B, 5-pipeline C, 6-pipeline D, 7-branch pipe, 8-lid, 21-body part, 22-blind hole, 23-recess, 24-interface, 25-core, 26-arch, 27-knob, 200-round pin axle, 210-first body, 220-through hole a, 230-through hole B, 240-sealing ring, 250-second body, 260-through hole C, 270-through hole D, 280-fixed axle, 290-handle, 201-connecting pipe a, 202-connecting pipe B, 203-connecting pipe C, 204-connecting pipe D, 205-flow stopping clip.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Embodiment one:
as shown in fig. 1, a blood purification system comprises a blood purification device 1 and a blood flow reversing device 2, wherein a blood inlet end and a blood outlet end of the blood purification device 1 are respectively connected with a pipeline A3 and a pipeline B4, and also comprise a pipeline C5 and a pipeline D6 which are connected with a patient, and the pipeline A3, the pipeline B4, the pipeline C5 and the pipeline D6 are respectively communicated with the blood flow reversing device 2; when the blood flow reversing device 2 is in a state, the pipeline A3 is communicated with the pipeline C5, and the pipeline B4 is communicated with the pipeline D6; in another state of the blood flow reversing device 2, the pipeline A3 is communicated with the pipeline D6, and the pipeline B4 is communicated with the pipeline C5.
The pipeline C5 and the pipeline D6 are branch pipelines of the double-cavity catheter.
The pipeline C5 and the pipeline D6 are connected with a branch pipe 7, the branch pipe 7 is provided with a cover 8, and the cover 8 is in sealing connection with the branch pipe 7.
In order to ensure that no blood shear force is formed when blood flows in the lines, the diameters of the lines A3, B4, C5 and D6 are equal.
As shown in fig. 2 and 3, the blood flow reversing device 2 is a rotary reversing device, and includes a cylindrical body portion 21, a blind hole 22 is formed in the top surface of the body portion 21, a circle of grooves 23 along the circumferential direction of the blind hole 22 are formed in the side wall of the blind hole 22, four interfaces 24 are formed in the side wall of the body portion 21, the four interfaces 24 are communicated with the grooves 23, the four interfaces 24 are respectively located in four quadrants of the same coordinate system, the four interfaces 24 are uniformly distributed on the side wall of the body portion 21 at 90 ° intervals, the four interfaces 24 are respectively connected with a pipeline A3, a pipeline B4, a pipeline C5 and a pipeline D6, wherein the pipeline A3 is opposite to the pipeline B4, and the pipeline C5 is opposite to the pipeline D6;
a core 25 is arranged in the blind hole 22, the core 25 is matched with the blind hole 22, the core 25 is rotationally connected with the body part 21, two opposite protrusions 26 are arranged on the side wall of the core 25, and the protrusions 26 are matched with the grooves 23; the cross section of the groove 23 is arc-shaped or rectangular.
Seals are provided between the blind holes 22 and the core 25, and between the protrusions 26 and the grooves 23.
For ease of use, the top of the core 25 is provided with a knob 27.
In order to prevent the core 25 from rotating during blood flowing, the knob 27 is slidably connected with the core 25, a sliding groove is arranged at the top of the core 25, the knob 27 is matched with the sliding groove, the sliding groove penetrates through the opposite side wall of the core 25 and extends to the top surface of the body 21, four sliding grooves are arranged on the top surface of the body 21 at intervals of 90 degrees, when the knob 27 is matched with one sliding groove on the top surface of the body 21, the pipeline A3 is communicated with the pipeline C5, and the pipeline B4 is communicated with the pipeline D6; when knob 27 is engaged with another slide groove on the top surface of body portion 21, the line A3 communicates with line D6 and line B4 communicates with line C5.
The diameter of the joint 24 is equal to the diameters of the pipeline A3, the pipeline B4, the pipeline C5 and the pipeline D6.
The cross-sectional area of the groove 23 is equal to the cross-sectional area of the inner wall of the mouthpiece 24.
In use, one port of the pipeline A3, the pipeline B4, the pipeline C5 and the pipeline D6 is respectively connected to the blood purifying device 1 and the patient; as shown in fig. 4, the other ports of the pipeline A3 and the pipeline B4 are respectively connected to the two opposite interfaces 24, the other ports of the pipeline C5 and the pipeline D6 are respectively connected to the other two opposite interfaces 24, the knob 27 is turned to make the pipeline A3 and the pipeline C5 located at one side of the protrusion 26, the pipeline B4 and the pipeline D6 located at the other side of the protrusion 26, the knob 27 is slid onto the chute on the top surface of the body 21, and the core 25 is fixed and cannot rotate; starting the blood purification device 1 to start blood purification for the patient, wherein blood flows into the blood purification device 1 from the patient through the pipe C5, the groove 23 and the pipe A3, and after purification, the blood flows into the patient through the pipe B4, the groove 23 and the pipe D6;
when it is necessary to reverse the flow of blood, the knob 27 is turned and the knob 27 is slid onto the other slide groove on the top surface of the body 21, so that the line A3 and the line D6 are located on the same side of the protrusion 26, and the line B4 and the line C5 are located on the other side of the protrusion 26, and at this time, blood flows from the patient into the blood purifying device 1 through the line D6, the groove 23, and the line A3, and after purification, the blood flows into the patient through the line B4, the groove 23, and the line C5.
Embodiment two:
as shown in fig. 5, it is different from the first embodiment in that: in this embodiment, the blood flow reversing device 2 is a rotary reversing device, and includes a cylindrical first body 210 and a second body 250, the end surface of the first body 210 is provided with a fixed shaft 280, the fixed shaft 280 is perpendicular to the end surface of the first body 210, the end surface of the second body 250 is provided with a shaft hole adapted to the fixed shaft 280, the end surface of the first body 210 and the end surface of the second body 250 are connected by the fixed shaft 280 in a mutually rotating manner, the end surface of the first body 210 is provided with a through hole a220 and a through hole B230, the end surface of the second body 250 is provided with a through hole C260 and a through hole D270, the through hole a220, the through hole B230, the through hole C260 and the through hole D270 are all parallel to the fixed shaft 280, the rotation radiuses of the through hole a220, the through hole B230, the through hole C260 and the through hole D270 are equal, and the diameters of the through holes a220, B230, the through hole C260 and the through hole D270 are equal to the diameters of the pipeline A3, the pipeline B4, the pipeline C5 and the pipeline D6.
The end surface of the first body 210 is provided with two sealing rings 240, the two sealing rings 240 are concentric with the through hole a220 and the through hole b230 respectively, and the diameters of the two sealing rings 240 are larger than the diameter of the through hole a220 and the diameter of the through hole b230 respectively.
In order to facilitate the rotation of the first body 210 relative to the second body 250, a handle 290 is disposed on a sidewall of the second body 250.
In order to ensure that the blood flow reversing device 2 can be stably in the first state or the second state, the second body 250 is provided with a pin shaft 200, the end surface of the first body 210 is provided with two pin holes matched with the pin shaft 200, the pin shaft 200 penetrates through the second body 250, the two pin holes are symmetrically arranged about the fixed shaft 280, when the pin shaft 200 is matched with one of the pin holes on the end surface of the first body 210, the pipeline A3 is communicated with the pipeline C5, and the pipeline B4 is communicated with the pipeline D6; when the pin shaft 200 is matched with another pin hole on the end surface of the first body 200, the pipeline A3 is communicated with the pipeline D6, and the pipeline B4 is communicated with the pipeline C5.
In use, one port of the pipeline A3, the pipeline B4, the pipeline C5 and the pipeline D6 is respectively connected to the blood purifying device 1 and the patient; as shown in fig. 6, the other ports of the pipeline A3 and the pipeline B4 are respectively connected with the through hole a220 and the through hole B230 on the first body 210, the other ports of the pipeline C5 and the pipeline D6 are respectively connected with the through hole C260 and the through hole D270 on the second body 250, the pin 200 is inserted into one of the pin holes, the blood purifying device 1 is started, at this time, blood flows into the blood purifying device 1 from the patient body through the pipeline C5, the through hole C260, the through hole a220 and the pipeline A3, and after purification, the blood flows into the patient through the pipeline B4, the through hole B230, the through hole D270 and the pipeline D6;
when blood flow is required to flow reversely, only the pin 200 is pulled out, the handle 290 is turned by 180 degrees, and then the pin 200 is inserted into the other pin hole, at this time, the blood flows into the blood purifying device 1 from the patient body through the pipeline D6, the through hole D270, the through hole a220 and the pipeline A3, and after purification, the blood flows into the patient through the pipeline B4, the through hole B230, the through hole C260 and the pipeline C5.
Embodiment III:
as shown in fig. 7, it is different from the first embodiment in that: in this embodiment, the blood flow reversing device 2 includes a connection tube a201, a connection tube B202, a connection tube C203, and a connection tube D204, the line A3 is connected to the line C5 and the line D6 through the connection tube a201 and the connection tube B202, and the line B4 is connected to the line C5 and the line D6 through the connection tube C203 and the connection tube D204, and the connection tube a201, the connection tube B202, the connection tube C203, and the connection tube D204 are respectively provided with a flow stop clip 205.
The diameters of the connecting pipes a201, B202, C203 and D204 are equal to those of the pipelines A3, B4, C5 and D6.
In use, one port of the pipeline A3, the pipeline B4, the pipeline C5 and the pipeline D6 is respectively connected to the blood purifying device 1 and the patient; the other port of the pipeline A3 is communicated with the pipeline C5 and the pipeline D6 through a connecting pipe a201 and a connecting pipe B202, and the other port of the pipeline B4 is communicated with the pipeline C5 and the pipeline D6 through a connecting pipe C203 and a connecting pipe D204; opening the flow stopping clamp 205 on the connecting pipe a201, closing the flow stopping clamp 205 on the connecting pipe B202, opening the flow stopping clamp 205 on the connecting pipe C203, closing the flow stopping clamp 205 on the connecting pipe D204, starting the blood purifying device 1, and enabling blood to flow into the blood purifying device 1 from the patient through the pipeline C5, the connecting pipe a201 and the pipeline A3, and after purification, flowing into the patient through the pipeline B4, the connecting pipe C203 and the pipeline D6;
when the blood flow is required to flow reversely, the flow stopping clamp 205 on the connecting pipe a201 is closed, the flow stopping clamp 205 on the connecting pipe B202 is opened, the flow stopping clamp 205 on the connecting pipe C203 is closed, the flow stopping clamp 205 on the connecting pipe D204 is opened, at this time, blood flows into the blood purifying device 1 from the patient body through the pipeline D6, the connecting pipe B202 and the pipeline A3, and flows into the patient through the pipeline B4, the connecting pipe D204 and the pipeline C5 after being purified.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A blood purification system, characterized by: the blood flow reversing device comprises a blood purifying device (1) and a blood flow reversing device (2), wherein a blood inlet end and a blood outlet end of the blood purifying device (1) are respectively connected with a pipeline A (3) and a pipeline B (4), the blood flow reversing device also comprises a pipeline C (5) and a pipeline D (6) which are connected with a patient, and the pipeline A (3), the pipeline B (4), the pipeline C (5) and the pipeline D (6) are respectively communicated with the blood flow reversing device (2); when the blood flow reversing device (2) is in a state, the pipeline A (3) is communicated with the pipeline C (5), and the pipeline B (4) is communicated with the pipeline D (6); when the blood flow reversing device (2) is in the other state, the pipeline A (3) is communicated with the pipeline D (6), and the pipeline B (4) is communicated with the pipeline C (5);
the blood flow reversing device (2) comprises a body part (21), a blind hole (22) is formed in the top surface of the body part (21), a circle of grooves (23) along the circumferential direction of the blind hole (22) are formed in the side wall of the blind hole (22), four interfaces (24) are formed in the side wall of the body part (21), the four interfaces (24) are communicated with the grooves (23), and the four interfaces (24) are respectively located in four quadrants of the same coordinate system; a core part (25) is arranged in the blind hole (22), the core part (25) is rotationally connected with the body part (21), two opposite bulges (26) are arranged on the side wall of the core part (25), and the bulges (26) are matched with the grooves (23);
the pipeline C (5) and the pipeline D (6) are connected with a branch pipe (7), and the branch pipe (7) is provided with a cover (8).
2. A blood purification system according to claim 1, wherein: the top of the core (25) is provided with a knob (27).
3. The blood purification system of claim 2, wherein: the knob (27) is in sliding connection with the core (25), a sliding groove is formed in the top of the core (25), the knob (27) is matched with the sliding groove, and the sliding groove penetrates through the side wall of the core (25) and extends to the top surface of the body (21).
4. A blood purification system according to claim 1, wherein: sealing elements are arranged between the blind holes (22) and the core (25) and between the protrusions (26) and the grooves (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711167129.1A CN107802906B (en) | 2017-11-21 | 2017-11-21 | Blood purifying system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711167129.1A CN107802906B (en) | 2017-11-21 | 2017-11-21 | Blood purifying system |
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| CN107802906A CN107802906A (en) | 2018-03-16 |
| CN107802906B true CN107802906B (en) | 2023-09-22 |
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| CN201711167129.1A Active CN107802906B (en) | 2017-11-21 | 2017-11-21 | Blood purifying system |
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| CN108371732B (en) * | 2018-04-17 | 2020-09-04 | 复旦大学附属中山医院 | Myocardial protection liquid perfusion device |
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