CN112057690A

CN112057690A - Continuous blood purification equipment with replacement liquid purification function

Info

Publication number: CN112057690A
Application number: CN202011117928.XA
Authority: CN
Inventors: 陈创华; 蔡瑛; 韦梅珍; 李艳操
Original assignee: First Affiliated Hospital of Shantou University Medical College
Current assignee: First Affiliated Hospital of Shantou University Medical College
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2020-12-11
Anticipated expiration: 2040-10-19
Also published as: CN112057690B

Abstract

The invention belongs to the technical field of medical equipment, in particular to continuous blood purification equipment with a replacement liquid purification function, which comprises a host machine; one side of the host is fixedly connected with a blood filter; a balancing pole is arranged in a groove formed in the bottom of the main machine, and the middle of the balancing pole is hinged with the main machine through a rotating pin; the two ends of the balancing rod are symmetrically provided with a waste liquid bag and a balancing weight, a fixed pulley is rotatably connected with a position corresponding to the upper part of the balancing weight in the host machine, a pull rope is wound on the fixed pulley, one end of the pull rope is fixedly connected with the balancing weight, and the other end of the pull rope is fixedly connected with the liquid supplementing bag; a waste liquid loop pipe communicated with the waste liquid bag bypasses the waste liquid pump and then is communicated with the middle part of the blood filter; according to the invention, the balancing rod is matched with the balancing weight and the fixed pulley, so that the pumping speed of the waste liquid pump is rapidly adjusted, and the balance of water in blood is further ensured.

Description

Continuous blood purification equipment with replacement liquid purification function

Technical Field

The invention belongs to the technical field of medical equipment, and particularly relates to continuous blood purification equipment with a replacement liquid purification function.

Background

Continuous Renal Replacement Therapy (CRRT) is a new blood purification technique that has been greatly developed in more than ten years, and refers to a treatment mode that slowly and continuously removes water and solutes. As early as 1977, Karmer initially created a continuous arteriovenous hemofiltration (CAVH) technique for the treatment of acute renal failure with good results, and later derived various CRRT models according to clinical needs, such as arteriovenous Slow Continuous Ultrafiltration (SCUF), continuous venous hemodiafiltration (CVVHDF), continuous venous hemodialysis (CVVHD), and the like. CRRT technology employs continuous operation (often continuous for 24 hours); the blood flow in the extracorporeal circulation is increased, a filter with high flux and good biocompatibility is used, a large amount of replacement liquid is prepared, and an accurate liquid balance system is arranged. The improvement ensures that CRRT has stable blood flow power; can continuously and stably control azotemia and electrolyte and water salt metabolism; can continuously remove toxins and middle molecular substances existing in circulation; providing nutritional supplement as needed, and the like. Provides the homeostasis balance for the survival for the treatment of the serious patients, can be applied even under the condition of low blood pressure, and creates good nutritional support conditions.

In the prior art, human blood is filled into a blood filter through a blood pump, then flows back into a human body through a venous return pipe at the top end of the blood filter, meanwhile, a waste liquid pump generates negative pressure on a waste liquid return pipe communicated with the blood filter, then moisture and toxin in the blood discharged by the blood filter flow into a waste liquid bag through the waste liquid return pipe, and meanwhile, replacement liquid in a liquid supplementing bag is filtered by a purifier and then is filled into the venous return pipe to supplement the moisture loss in the blood, but the discharge amount of the waste liquid and the supplement amount of the replacement liquid are not easy to control, the normal supply of the moisture in the returned blood is influenced, and the treatment effect is reduced.

Therefore, the invention provides a continuous blood purification device with a replacement liquid purification function.

Disclosure of Invention

In order to make up for the defects of the prior art and solve the problems that the discharge amount of waste liquid and the supplement amount of replacement liquid are not easy to control, the normal supply of water in the backflow blood is influenced and the treatment effect is reduced in the prior art, the invention provides the continuous blood purification equipment with the replacement liquid purification function.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to continuous blood purification equipment with a replacement liquid purification function, which comprises a host machine; the top of the main machine is provided with a control panel, and one side of the main machine is fixedly connected with a blood filter; the top connector of the blood filter is communicated with a venous return pipe, and the bottom connector of the blood filter is communicated with an arterial return pipe and the arterial return pipe bypasses the blood pump; a balance rod is arranged in a groove formed in the bottom of the main machine, and the middle of the balance rod is hinged with the main machine through a rotating pin; the balance rod is provided with a waste liquid bag and a balancing weight symmetrically at two ends, a fixed pulley is rotatably connected with a position corresponding to the upper part of the balancing weight in the host machine, a pull rope is wound on the fixed pulley, one end of the pull rope is fixedly connected with the balancing weight, and the other end of the pull rope is fixedly connected with the liquid supplementing bag; a waste liquid loop pipe communicated with the waste liquid bag bypasses the waste liquid pump and then is communicated with the middle part of the blood filter; when the device works, in the prior art, human blood is filled into a blood filter through a blood pump, then flows back into a human body through a venous return pipe at the top end of the blood filter, meanwhile, a waste liquid pump generates negative pressure on the waste liquid return pipe communicated with the blood filter, so that water and toxin in the blood discharged by the blood filter flow into a waste liquid bag through the waste liquid return pipe, meanwhile, replacement liquid in a liquid supplementing bag is filtered by a purifier and then is filled into the venous return pipe to supplement the water loss in the blood, but the discharge amount of the waste liquid and the supplement amount of the replacement liquid are not easy to control, the normal supply of the water in the returned blood is influenced, the treatment effect is reduced, at the moment, the waste liquid bag and the balancing weight arranged at the two ends of the balancing rod are mutually balanced, and the medical care personnel can easily observe that the generation amount of the waste liquid in the waste liquid bag and the consumption amount of the replacement liquid in the liquid supplementing bag are, and then the pumping speed of the waste liquid pump is rapidly adjusted, so that the production speed of the waste liquid is balanced with the supplement speed of the replacement liquid, the balance of water in blood is further ensured, and the treatment effect of a patient is improved.

Preferably, a sliding groove is formed in the balancing rod at a position corresponding to the rotating pin, a shaft sleeve sleeved on the rotating pin is connected with the sliding groove in a sliding mode, and the shaft sleeve is connected with the rotating pin in a rotating mode; a regulating rod is connected in a threaded hole formed in one side of the balancing rod in a threaded manner, one end of the regulating rod is fixedly connected with a handle, and the other end of the regulating rod extends into the sliding groove and is rotatably connected with the shaft sleeve; after hanging waste liquid bag and fluid infusion bag, through rotatory handle, and then make the relative position between regulation pole rotation back adjustment axle sleeve and the balancing pole for the balancing pole is in balanced state, and then increases the accuracy of weighing of balancing pole, increases waste liquid pump pumping speed regulation's efficiency, further guarantees that the production speed of waste liquid is balanced with the replenishment speed of replacement liquid.

Preferably, the balance rod is symmetrically provided with a pair of limiting plates, and the limiting plates are provided with limiting grooves; the balance rod penetrates through the limiting groove and is not in contact with the limiting groove; the upper end and the lower end of the limiting groove are fixedly connected with buffer springs; through the balancing pole swing in the spacing groove, the swing range of restriction balancing pole, and then avoid the balancing pole unbalance, cooperate buffer spring to the support of balancing pole simultaneously, avoid the rigid collision between balancing pole and spacing groove and the host computer, guarantee the measurement accuracy of balancing pole, further increase the production speed of waste liquid and the balanced efficiency of the replenishment speed of replacement liquid.

Preferably, one adjacent side of the two buffer springs is fixedly connected with an elastic air bag, and one adjacent side of the elastic air bag is provided with an air injection hole; absorb balancing pole wobbling kinetic energy through elastic airbag's quick deformation, further prevent the rigidity collision that the balancing pole received for it is not hard up after receiving vibrations to adjust the pole, influences the balanced precision of balancing pole, and the compressed air that the elastic airbag received production after the extrusion simultaneously spouts through the fumarole, further clears up the impurity of adhesion on the balancing pole, increases the measurement accuracy of balancing pole.

Preferably, the waste liquid pump comprises a U-shaped groove arranged in the middle of the main machine; a swing rod is arranged in the U-shaped groove, and a rotating shaft fixedly connected with the middle part of the swing rod is driven by a servo motor; two ends of the swing rod are rotatably connected with extrusion wheels; the waste liquid loop pipe is attached to the side wall of the U-shaped groove in a U shape, and the waste liquid loop pipe is wound on the peripheries of the two extrusion wheels; the inner side of the waste liquid loop pipe is provided with a wear-resistant belt which is fixedly connected with the U-shaped groove; keep apart extrusion wheel and waste liquid return pipe through wear-resisting area, and then reduce the wearing and tearing that waste liquid return pipe received, reduce the waste liquid return pipe and break the normal operating that influences the waste liquid pump after wearing and tearing excessively, and then increase the life of waste liquid return pipe.

Preferably, a pair of first gears is fixedly connected to the waste liquid loop pipe at positions corresponding to the two extrusion wheels, and the two first gears are meshed with each other; a second gear is rotatably connected in the main machine on one side of the first gear and meshed with one first gear; the second gear is driven to rotate by a forward and reverse rotating motor; the motor that is just reversing drives No. two gears and constantly reciprocates square commentaries on classics for No. two gears drive a gear and constantly reciprocate to rotate, make the position that waste liquid return circuit pipe is located the U-shaped groove constantly twist reverse along self axis production, and then reduce waste liquid return circuit pipe and produce plastic deformation and fracture after the same side extrudees repeatedly, the elastic deformation time of extension waste liquid return circuit pipe, and then further increase waste liquid return circuit pipe's life.

The invention has the following beneficial effects:

1. according to the continuous blood purification equipment with the replacement liquid purification function, the waste liquid bags arranged at the two ends of the balancing rod are mutually balanced with the balancing weight, and the stay cord is wound around the liquid supplementing bag hung behind the fixed pulley, so that medical workers can easily observe that the generation amount of waste liquid in the waste liquid bag is mutually balanced with the consumption amount of replacement liquid in the liquid supplementing bag, the pumping speed of the waste liquid pump is quickly adjusted, the production speed of the waste liquid is balanced with the supplement speed of the replacement liquid, the balance of water in blood is further ensured, and the treatment effect of a patient is improved.

2. According to the continuous blood purification equipment with the replacement liquid purification function, the forward and reverse rotating motor drives the second gear to continuously reciprocate for square rotation, so that the second gear drives the first gear to continuously reciprocate, the part of the waste liquid loop pipe, which is positioned in the U-shaped groove, is continuously twisted along the axis of the waste liquid loop pipe, plastic deformation and cracking of the waste liquid loop pipe after repeated extrusion on the same side face are reduced, the elastic deformation time of the waste liquid loop pipe is prolonged, and the service life of the waste liquid loop pipe is further prolonged.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is an enlarged view of a portion of FIG. 2 at B;

FIG. 5 is a cross-sectional view taken at C-C in FIG. 3

FIG. 6 is a partial cross-sectional view of the balance bar of the present invention;

in the figure: the device comprises a host 1, a control panel 11, a blood filter 12, a venous return pipe 13, an arterial return pipe 14, a blood pump 15, a balancing rod 2, a rotating pin 21, a waste liquid bag 22, a balancing weight 23, a fixed pulley 24, a pull rope 25, a liquid supplementing bag 26, a waste liquid return pipe 27, a waste liquid pump 3, a sliding chute 4, a shaft sleeve 41, an adjusting rod 42, a handle 43, a limiting plate 44, a limiting groove 45, a buffer spring 46, an elastic air bag 47, a U-shaped groove 31, a swinging rod 32, a squeezing wheel 33, a wear-resistant belt 34, a first gear 35 and a second gear 36.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 6, the continuous blood purification apparatus with a replacement fluid purification function according to the present invention comprises a main machine 1; the top of the main machine 1 is provided with a control panel 11, and one side of the main machine 1 is fixedly connected with a blood filter 12; the top connector of the blood filter 12 is communicated with a venous return pipe 13, and the bottom connector of the blood filter 12 is communicated with an arterial return pipe 14, and the arterial return pipe 14 bypasses a blood pump 15; a balance rod 2 is arranged in a groove formed in the bottom of the main machine 1, and the middle of the balance rod 2 is hinged with the main machine 1 through a rotating pin 21; two ends of the balancing rod 2 are symmetrically provided with a waste liquid bag 22 and a balancing weight 23, a fixed pulley 24 is rotatably connected in the host 1 at a position corresponding to the upper part of the balancing weight 23, a pull rope 25 is wound on the fixed pulley 24, one end of the pull rope 25 is fixedly connected with the balancing weight 23, and the other end of the pull rope 25 is fixedly connected with a liquid supplementing bag 26; a waste liquid loop pipe 27 communicated with the waste liquid bag 22 bypasses the waste liquid pump 3 and is communicated with the middle part of the blood filter 12; during operation, in the prior art, human blood is filled into the blood filter 12 through the blood pump 15, and then flows back into the human body through the venous return pipe 13 at the top end of the blood filter 12, and the waste liquid pump 3 generates negative pressure on the waste liquid return pipe 27 communicated with the blood filter 12, so that water and toxins in the blood discharged by the blood filter 12 flow into the waste liquid bag 22 through the waste liquid return pipe 27, and meanwhile, the replacement liquid in the fluid infusion bag 26 is filtered by the purifier and then filled into the venous return pipe 13 to supplement the water loss in the blood, but the discharge amount of the waste liquid and the supplement amount of the replacement liquid are not easy to control, thereby affecting the normal supply of the water in the returned blood and reducing the treatment effect, at this time, the waste liquid bag 22 and the balancing weight 23 arranged at the two ends of the balancing rod 2 are mutually balanced, and the fluid infusion bag 26 hung after bypassing the fixed pulley 24 through the pull rope 25 makes it easy for medical staff to observe that the generation amount of the waste liquid in the waste liquid bag 22 and the consumption of the replacement liquid in, and then the pumping speed of the waste liquid pump 3 is rapidly adjusted, so that the production speed of the waste liquid is balanced with the supplement speed of the replacement liquid, the balance of water in blood is further ensured, and the treatment effect of a patient is improved.

As an embodiment of the present invention, a sliding slot 4 is formed in the balancing rod 2 at a position corresponding to the rotating pin 21, a shaft sleeve 41 sleeved on the rotating pin 21 is slidably connected to the sliding slot 4, and the shaft sleeve 41 is rotatably connected to the rotating pin 21; a regulating rod 42 is connected with a threaded hole formed in one side of the balancing rod 2 in a threaded manner, one end of the regulating rod 42 is fixedly connected with a handle 43, and the other end of the regulating rod extends into the sliding groove 4 and is rotatably connected with the shaft sleeve 41; after hanging waste liquid bag 22 and fluid infusion bag 26, through rotatory handle 43, and then make adjusting lever 42 rotate the relative position between adjustment axle sleeve 41 and the balancing pole 2 for balancing pole 2 is in balanced state, and then increases the weighing accuracy of balancing pole 2, increases the efficiency that waste liquid pump 3 pump sending speed was adjusted, further guarantees that the production speed of waste liquid is balanced with the replenishment speed of replacement liquid.

As an embodiment of the present invention, a pair of limiting plates 44 is symmetrically disposed on the balancing rod 2, and a limiting groove 45 is disposed on each limiting plate 44; the balancing rod 2 penetrates through the limiting groove 45 and is not in contact with the limiting groove 45; the upper end and the lower end of the limiting groove 45 are fixedly connected with buffer springs 46; swing in spacing groove 45 through balancing pole 2, restriction balancing pole 2's swing range, and then avoid balancing pole 2 to be unbalanced, cooperate buffer spring 46 to balancing pole 2's support simultaneously, avoid the rigid collision between balancing pole 2 and spacing groove 45 and the host computer 1, guarantee balancing pole 2's measurement accuracy, further increase the production speed of waste liquid and the balanced efficiency of the replenishment speed of replacement liquid.

As an embodiment of the present invention, an elastic airbag 47 is fixedly connected to one side of the two buffer springs 46, and an air vent is formed on one side of the elastic airbag 47; absorb the wobbling kinetic energy of balancing pole 2 through the quick deformation of elasticity gasbag 47, further prevent the rigidity collision that balancing pole 2 received for it is not hard up after adjusting pole 42 receives vibrations, influences the balanced precision of balancing pole 2, and elasticity gasbag 47 receives the compressed air that produces after the extrusion through the fumarole blowout simultaneously, further clears up the impurity of adhesion on balancing pole 2, increases the measurement accuracy of balancing pole 2.

As an embodiment of the present invention, the waste liquid pump 3 includes a U-shaped groove 31 formed in the middle of the main body 1; a swing rod 32 is arranged in the U-shaped groove 31, and a rotating shaft fixedly connected with the middle part of the swing rod 32 is driven by a servo motor; two ends of the swing rod 32 are rotatably connected with extrusion wheels 33; the waste liquid loop pipe 27 is attached to the side wall of the U-shaped groove 31 in a U shape, and the waste liquid loop pipe 27 is wound on the peripheries of the two extrusion wheels 33; the inner side of the waste liquid loop pipe 27 is provided with a wear-resistant belt 34, and the wear-resistant belt 34 is fixedly connected with the U-shaped groove 31; keep apart extrusion wheel 33 and waste liquid return pipe 27 through wear-resisting area 34, and then reduce the wearing and tearing that waste liquid return pipe 27 received, break after reducing waste liquid return pipe 27 excessive wearing and tearing and influence waste liquid pump 3's normal operating, and then increase waste liquid return pipe 27's life.

As an embodiment of the present invention, a one-to-one gear 35 is fixedly connected to the waste liquid loop pipe 27 at a position corresponding to the two squeezing wheels 33, and the two one-to-one gears 35 are engaged with each other; a second gear 36 is rotationally connected in the main machine 1 on one side of the first gear 35, and the second gear 36 is meshed with one first gear 35; the second gear 36 is driven to rotate by a forward and reverse rotating motor; the motor that is just reversing drives No. two gears 36 and constantly reciprocates square commentaries on classics for No. two gears 36 drive a gear 35 and constantly reciprocate and rotate, make waste liquid return circuit pipe 27 constantly twist reverse along self axis in the position that is located U-shaped groove 31, and then reduce waste liquid return circuit pipe 27 and produce plastic deformation and fracture after extrudeing repeatedly with the same side, prolong waste liquid return circuit pipe 27's elastic deformation time, and then further increase waste liquid return circuit pipe 27's life.

When the device works, the waste liquid bag 22 and the balancing weight 23 arranged at the two ends of the balancing rod 2 are balanced with each other, and the fluid infusion bag 26 hung after bypassing the fixed pulley 24 through the pull rope 25 enables medical personnel to easily observe that the generation amount of waste liquid in the waste liquid bag 22 is balanced with the consumption amount of replacement liquid in the fluid infusion bag 26, so that the pumping speed of the waste liquid pump 3 is quickly adjusted, the production speed of the waste liquid is balanced with the supplement speed of the replacement liquid, the balance of water in blood is further ensured, and the treatment effect of a patient is improved; after the waste liquid bag 22 and the liquid supplementing bag 26 are hung, the handle 43 is rotated, so that the adjusting rod 42 is rotated to adjust the relative position between the shaft sleeve 41 and the balance rod 2, the balance rod 2 is in a balance state, the weighing accuracy of the balance rod 2 is increased, the pumping speed adjusting efficiency of the waste liquid pump 3 is increased, and the balance between the production speed of waste liquid and the supplementing speed of replacement liquid is further ensured; the swing amplitude of the balance rod 2 is limited by swinging the balance rod 2 in the limiting groove 45, so that the balance rod 2 is prevented from being unbalanced, and meanwhile, the balance rod 2 is supported by the buffer spring 46, so that rigid collision between the balance rod 2 and the limiting groove 45 and between the balance rod 2 and the host 1 is avoided, the measurement precision of the balance rod 2 is ensured, and the balance efficiency of the production speed of waste liquid and the supplement speed of replacement liquid is further increased; the kinetic energy of the swinging of the balance rod 2 is absorbed through the rapid deformation of the elastic air bag 47, the rigid collision of the balance rod 2 is further prevented, the adjusting rod 42 is loosened after being vibrated, the balance precision of the balance rod 2 is influenced, meanwhile, compressed air generated after the elastic air bag 47 is extruded is sprayed out through the air spraying holes, impurities adhered to the balance rod 2 are further cleaned, and the measurement precision of the balance rod 2 is improved; the extrusion wheel 33 is isolated from the waste liquid loop pipe 27 through the wear-resistant belt 34, so that the abrasion of the waste liquid loop pipe 27 is reduced, the influence of breakage of the waste liquid loop pipe 27 after excessive abrasion on the normal operation of the waste liquid pump 3 is reduced, and the service life of the waste liquid loop pipe 27 is prolonged; the motor that is just reversing drives No. two gears 36 and constantly reciprocates square commentaries on classics for No. two gears 36 drive a gear 35 and constantly reciprocate and rotate, make waste liquid return circuit pipe 27 constantly twist reverse along self axis in the position that is located U-shaped groove 31, and then reduce waste liquid return circuit pipe 27 and produce plastic deformation and fracture after extrudeing repeatedly with the same side, prolong waste liquid return circuit pipe 27's elastic deformation time, and then further increase waste liquid return circuit pipe 27's life.

The front, the back, the left, the right, the upper and the lower are all based on figure 1 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a take continuous blood purification equipment of replacement liquid purification performance which characterized in that: comprises a host (1); the top of the main machine (1) is provided with a control panel (11), and one side of the main machine (1) is fixedly connected with a blood filter (12); the top connector of the blood filter (12) is communicated with a venous loop pipe (13), the bottom connector of the blood filter (12) is communicated with an arterial loop pipe (14), and the arterial loop pipe (14) bypasses a blood pump (15); a balance rod (2) is arranged in a groove formed in the bottom of the main machine (1), and the middle of the balance rod (2) is hinged with the main machine (1) through a rotating pin (21); two ends of the balancing rod (2) are symmetrically provided with a waste liquid bag (22) and a balancing weight (23), a fixed pulley (24) is rotatably connected in the host (1) at a position corresponding to the upper part of the balancing weight (23), a pull rope (25) is wound on the fixed pulley (24), one end of the pull rope (25) is fixedly connected with the balancing weight (23), and the other end of the pull rope is fixedly connected with a liquid supplementing bag (26); and a waste liquid loop pipe (27) communicated with the waste liquid bag (22) bypasses the waste liquid pump (3) and then is communicated with the middle part of the blood filter (12).

2. The continuous blood purification apparatus with substitution liquid purification function according to claim 1, characterized in that: a sliding groove (4) is formed in the balance rod (2) at a position corresponding to the rotating pin (21), a shaft sleeve (41) sleeved on the rotating pin (21) is connected with the sliding groove (4) in a sliding mode, and the shaft sleeve (41) is connected with the rotating pin (21) in a rotating mode; the balance bar is characterized in that an adjusting rod (42) is connected with a threaded hole formed in one side of the balance bar (2) in a threaded manner, one end of the adjusting rod (42) is fixedly connected with a handle (43), and the other end of the adjusting rod extends into the sliding groove (4) and is rotatably connected with the shaft sleeve (41).

3. The continuous blood purification apparatus with substitution liquid purification function according to claim 2, characterized in that: a pair of limiting plates (44) is symmetrically arranged on the balancing rod (2), and a limiting groove (45) is formed in each limiting plate (44); the balancing rod (2) penetrates through the limiting groove (45) and is not in contact with the limiting groove (45); and the upper end and the lower end of the limiting groove (45) are fixedly connected with buffer springs (46).

4. The continuous blood purification apparatus with substitution liquid purification function according to claim 3, characterized in that: two the adjacent one side of buffer spring (46) is linked firmly elasticity gasbag (47), and the fumarole has been seted up to the adjacent one side of elasticity gasbag (47).

5. The continuous blood purification apparatus with substitution liquid purification function according to claim 4, characterized in that: the waste liquid pump (3) comprises a U-shaped groove (31) arranged in the middle of the main machine (1); a swing rod (32) is arranged in the U-shaped groove (31), and a rotating shaft fixedly connected with the middle part of the swing rod (32) is driven by a servo motor; two ends of the swing rod (32) are rotatably connected with extrusion wheels (33); the waste liquid loop pipe (27) is attached to the side wall of the U-shaped groove (31) in a U shape, and the waste liquid loop pipe (27) is wound on the peripheries of the two extrusion wheels (33); and a wear-resistant belt (34) is arranged on the inner side of the waste liquid loop pipe (27), and the wear-resistant belt (34) is fixedly connected with the U-shaped groove (31).

6. The continuous blood purification apparatus with substitution liquid purification function according to claim 5, characterized in that: a one-to-one gear (35) is fixedly connected to the waste liquid loop pipe (27) at a position corresponding to the two extrusion wheels (33), and the two one-to-one gears (35) are meshed with each other; a second gear (36) is rotationally connected to the main machine (1) on one side of the first gear (35), and the second gear (36) is meshed with one first gear (35); the second gear (36) is driven to rotate by a forward and reverse rotating motor.