Medical pump

Abstract

The present application provides a medical pump, which relates to the field of medical equipment and includes a piston pump, an end cover, a valve assembly, and a drive head. The piston pump includes a pump body and a piston rod. The pump body has a compression chamber, and the piston rod is slidably inserted into the compression chamber. The end cover is provided with a first channel and a second channel, and the end cover is detachably connected to the piston pump. The valve assembly includes a first one-way valve and a second one-way valve with opposite conduction directions. Both the first one-way valve and the second one-way valve are detachably connected to the compression chamber. The first one-way valve is used to conduct the first channel and the compression chamber when the volume of the compression chamber increases, and the second one-way valve is used to conduct the second channel and the compression chamber when the volume of the compression chamber decreases. The drive head is detachably connected to the pump body, and the drive head is used to rotate around a preset axis to drive the piston rod to reciprocate in the extending direction of the preset axis. This medical pump is convenient to disassemble, easy to clean, has a good cleaning effect, can be reused, is not prone to cross-infection, and is safe and reliable to use.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and more particularly, to a medical pump. Background Art

[0002] Most of the existing medical pumps are disposable products and cannot be reused multiple times, resulting in relatively high operating costs. If the medical pumps of the existing technology are directly reused, it is easy to block the one-way valve holes in the pump body. After the one-way valve holes are blocked, the pump body cannot be used normally, and the operating reliability is poor. In addition, if the pump body is reused, due to the complex internal structure of the pump body and inconvenient cleaning, the internal chamber of the pump body and components such as the one-way valve installed in the internal chamber of the pump body cannot be effectively cleaned. The internal chamber of the pump body and the one-way valve may cause patient infection due to incomplete disinfection and sterilization, and the use safety is poor.

[0003] After research by the inventor, it is found that the existing medical pumps have at least the following disadvantages:

[0004] Disposable, high cost; complex structure, inconvenient internal cleaning, and easy to be blocked if reused; incomplete internal cleaning, easy to have cross-infection, and poor safety. Summary of the Invention

[0005] The purpose of the present invention is to provide a medical pump that can improve the cleaning effect, can be reused multiple times, is not easily blocked, is not easily cross-infected, has high stability, and is safe and reliable.

[0006] The embodiments of the present invention are implemented as follows:

[0007] The present invention provides a medical pump, including:

[0008] A piston pump, an end cover, a valve assembly, and a drive head. The piston pump includes a pump body and a piston rod. The pump body has a compression chamber, and the piston rod is slidably inserted into the compression chamber. The end cover is provided with independent first and second channels, and the end cover is detachably connected to the piston pump. The valve assembly includes a first one-way valve and a second one-way valve with opposite conduction directions. Both the first one-way valve and the second one-way valve are detachably connected to the compression chamber. The first one-way valve is used to conduct the first channel and the compression chamber when the volume of the compression chamber increases, and the second one-way valve is used to conduct the second channel and the compression chamber when the volume of the compression chamber decreases. The drive head is detachably connected to the pump body, and the drive head is used to rotate around a preset axis to drive the piston rod to reciprocate in the extending direction of the preset axis, thereby adjusting the volume of the compression chamber.

[0009] In an alternative embodiment, the piston pump further includes an elastomer that is connected to both the pump body and the piston rod to impart a tendency for the piston rod to extend out of the pump body.

[0010] In an alternative embodiment, the drive head is provided with a first drive surface that is configured as a wave surface extending circumferentially about a preset axis. The wave surface abuts against the piston rod. When the position where the wave surface abuts against the piston rod moves from a wave trough to a wave crest, the wave surface drives the piston rod to move in the direction of inserting into the compression chamber. When the position where the wave surface abuts against the piston rod moves from a wave crest to a wave trough, the elastomer drives the piston rod to extend out of the compression chamber.

[0011] In an alternative embodiment, the drive head is provided with a second drive surface that is configured as an inclined surface. The inclined surface abuts against the piston rod. When the position where the inclined surface abuts against the piston rod moves from a high side away from the piston rod to a low side closer to the piston rod, the inclined surface drives the piston rod to move in the direction of inserting into the compression chamber. When the position where the inclined surface abuts against the piston rod moves from the low side to the high side, the elastomer drives the piston rod to extend out of the compression chamber.

[0012] In an alternative embodiment, the medical pump further includes a base provided with a guiding hole. The pump body is inserted into the guiding hole and is detachably connected to the base. The drive head is inserted into the guiding hole and is rotatably engaged with the base.

[0013] In an alternative embodiment, there are multiple piston pumps. Correspondingly, there are multiple valve assemblies, and the multiple valve assemblies are respectively and correspondingly engaged with the multiple piston pumps. The first one-way valves of the multiple valve assemblies are all configured to conduct the first channel and the compression chamber when the volume of the compression chamber increases. The second one-way valves of the multiple valve assemblies are all configured to conduct the second channel and the compression chamber when the volume of the compression chamber decreases. The drive head is simultaneously engaged with multiple piston rods of multiple piston pumps to drive the multiple piston rods to move in the extending direction of the preset axis, and the movement directions of at least two of the multiple piston rods are opposite.

[0014] In an alternative embodiment, the end cap has a first collecting groove and a second collecting groove. The first collecting groove communicates with the first channel and is disposed around the second collecting groove. The second collecting groove communicates with the second channel. The pump body closes the openings of the first collecting groove and the second collecting groove.

[0015] In an optional embodiment, a first sealing ring and a second sealing ring are provided between the end cover and the pump body, the first collecting groove is located between the first sealing ring and the second sealing ring, and the second collecting groove is located in the area surrounded by the first sealing ring.

[0016] In an optional embodiment, the end cover is threadedly connected to the pump body.

[0017] In an optional embodiment, the drive head includes a connecting plate, a driving rod and a transmission rod, and the driving rod and the transmission rod are both fixedly connected to the connecting plate, and the driving rod is used to drive the piston rod to extend and retract; the transmission rod is used to cooperate with the motor.

[0018] The beneficial effects of the embodiments of the present invention are:

[0019] In summary, the medical pump provided in this embodiment includes a piston pump, an end cover, a valve assembly and a drive head, the piston pump includes a pump body and a piston rod, the end cover is detachably connected to the pump body, the valve assembly is detachably installed in the pump body, the drive head is detachably connected to the pump body, and the drive head can drive the piston rod to reciprocate and retract, thereby adjusting the volume of the compression chamber, and realizing the action of liquid entering and exiting the compression chamber from the corresponding one-way valve. When the medical pump needs to be cleaned, the end cover is disassembled, the valve assembly is removed, and the drive head and the piston rod are removed from the pump body. In this way, the medical pump is split into multiple independent components, each of which is easy to clean, and the position of the valve assembly installed inside the piston pump can be effectively exposed after the valve assembly is removed, and it is not easy to have a cleaning dead angle, and the cleaning inside the pump body is also very convenient. After the medical pump is cleaned, it can be assembled again, so as to achieve reuse, save resources, and reduce operating costs. The medical pump has a good cleaning effect, is not easy to be blocked when reused, and is not easy to have cross infection, and is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic structural diagram of a medical pump according to an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the exploded structure of a medical pump according to an embodiment of the present invention;

[0023] Figure 3 It is a first cross-sectional structural schematic diagram of a medical pump according to an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the second sectional structure of the medical pump according to an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the structure of the piston pump according to an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the structure of the pump body according to an embodiment of the present invention;

[0027] Figure 7 Schematic diagram of the structure of the end cap according to an embodiment of the present invention;

[0028] Figure 8 Schematic diagram of the structure of the base according to an embodiment of the present invention;

[0029] Figure 9 Schematic diagram of the structure of the drive head according to an embodiment of the present invention;

[0030] Figure 10 Schematic diagram of the structure of a variant of the medical pump according to an embodiment of the present invention.

[0031] Icon:

[0032] 100 - piston pump; 110 - pump body; 111 - compression chamber; - stop bar; 120 - piston rod; 121 - sealing head; 122 - rod body; 123 - force - transmitting head; 130 - partition plate; 131 - first stepped hole; 132 - second stepped hole; 140 - elastic body; 150 - substrate; 151 - first annular groove; 152 - second annular groove; 160 - first sealing ring; 170 - second sealing ring; 200 - end cap; 210 - first channel; 220 - second channel; 230 - first collecting groove; 240 - second collecting groove; 300 - valve assembly; 301 - first valve assembly; 302 - second valve assembly; 310 - first one - way valve; 320 - second one - way valve; 400 - drive head; 410 - connecting plate; 420 - drive rod; 430 - transmission rod; 431 - drive surface; 4311 - wave crest; 4312 - wave trough; 500 - base; 510 - guiding hole. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0034] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0037] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0038] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the prior art, a medical pump includes a main body and a valve body. The main body is an integral structure, generally fixed by welding two components. Before welding, the valve body is positioned at a suitable position. After welding, the valve body is inside the main body and is wrapped by the main body. In this way, when the medical pump is used, the residual liquid inside is not easily discharged. Generally, a cleaning liquid is repeatedly flowed through the flow channel for cleaning. In this way, the internal dead corners of the main body and the valve body are not easily cleaned, the cleaning effect is poor, it is easily blocked during repeated use, and there is a risk of cross-infection. Therefore, the existing medical pumps generally cannot be reused, and the use cost is high.

[0040] In view of this, the designer provides a medical pump, which can be disassembled into multiple independent components. Each component is convenient to clean, has a good cleaning effect, and can be assembled together after cleaning for multiple repeated uses, reducing costs. At the same time, it is not easy to have cross-infection, and it is safe and reliable to use.

[0041] Please combine Figures 1 - 10 , in this embodiment, the medical pump includes a piston pump 100, an end cap 200, a valve assembly 300, and a drive head 400. The piston pump 100 includes a pump body 110 and a piston rod 120. The pump body 110 has a compression chamber 111, and the piston rod 120 is slidably inserted into the compression chamber 111. The end cap 200 is provided with an independent first channel 210 and a second channel 220, and the end cap 200 is detachably connected to the piston pump 100. The valve assembly 300 includes a first one-way valve 310 and a second one-way valve 320 with opposite conduction directions. Both the first one-way valve 310 and the second one-way valve 320 are detachably connected to the compression chamber 111. The first one-way valve 310 is used to conduct the first channel 210 and the compression chamber 111 when the volume of the compression chamber 111 increases, and the second one-way valve 320 is used to conduct the second channel 220 and the compression chamber 111 when the volume of the compression chamber 111 decreases. The drive head 400 is detachably connected to the pump body 110, and the drive head 400 is used to rotate around a preset axis to drive the piston rod 120 to reciprocate in the extending direction of the preset axis, so as to adjust the volume of the compression chamber 111.

[0042] Continuing from the above, the usage method of the medical pump provided in this embodiment is as follows:

[0043] Connect the first channel 210 and the second channel 220 to the corresponding containers respectively. Start the drive head 400. During the process of the drive head 400 rotating around the preset axis, it can drive the piston rod 120 to reciprocate in the extending direction of the preset axis. That is, the cooperation between the drive head 400 and the piston rod 120 can convert the rotational motion into a linear telescopic motion. During the reciprocating motion of the piston rod 120, the volume of the compression chamber 111 jointly defined by the piston rod 120 and the pump body 110 is continuously adjusted. That is, when the piston rod 120 is pulled out relative to the pump body 110, the length of the piston rod 120 exposed outside the pump body 110 gradually increases. At this time, the volume of the compression chamber 111 increases, and the liquid enters from the first channel 210 and enters the compression chamber 111 through the first one-way valve 310; when the piston rod 120 is inserted relative to the pump body 110, the length of the piston rod 120 exposed outside the pump body 110 gradually decreases. At this time, the volume of the compression chamber 111 decreases, and the liquid passes through the second one-way valve 320 from the compression chamber 111 and enters the second channel 220 and is discharged from the second channel 220, realizing the repeated suction of the liquid. When the medical pump needs to be cleaned, remove the end cover 200, take off the valve assembly 300, and remove the drive head 400 and the piston rod 120 from the pump body 110. In this way, the medical pump is disassembled into multiple independent components. Each independent component is convenient to clean, and the position inside the piston pump 100 where the valve assembly 300 is installed can be effectively exposed after the valve assembly 300 is removed, and it is not easy to have cleaning dead corners. The inside of the pump body 110 is also very convenient to clean. After the medical pump is cleaned, it can be reassembled again, so as to realize repeated use, save resources, and reduce the operation cost. And the cleaning effect of the medical pump is good. When it is reused, it is not easy to be blocked, and it is not easy to have cross-infection, which is safe and reliable.

[0044] The following embodiments illustrate the detailed structure of the medical pump of the present application by way of example.

[0045] Please refer to Figures 3 - 4, in this embodiment, it should be noted that the number of valve assemblies 300 can be set to multiple. For example, in this embodiment, the number of valve assemblies 300 is four. Correspondingly, the number of piston pumps 100 is four, and the four piston pumps 100 are respectively in one-to-one correspondence and cooperation with the four valve assemblies 300. Moreover, two of the four valve assemblies 300 are taken as a group, and the four valve assemblies 300 are evenly divided into two groups. The working states of the two valve assemblies 300 in the same group are the same, and the working states of the two groups of valve assemblies 300 are opposite. That is to say, when the two valve assemblies 300 in the same group are operating, the action of sucking the liquid into the compression chamber 111 is achieved simultaneously, or the action of squeezing the liquid out of the compression chamber 111 is achieved simultaneously. For example, for the convenience of description, the four valve assemblies 300 are respectively two first valve assemblies 301 and two second valve assemblies 302. The two first valve assemblies 301 are arranged at intervals relatively, the two second valve assemblies 302 are arranged at intervals relatively, and the two first valve assemblies 301 and the two second valve assemblies 302 are alternately arranged at intervals in the circumferential direction of the preset axis. When the two first valve assemblies 301 simultaneously perform the liquid suction action, the two second valve assemblies 302 simultaneously perform the liquid discharge action.

[0046] It should be understood that the structures of each valve assembly 300 and each piston pump 100 are the same, only the working states at the same moment are different. Therefore, in this embodiment, only the structures of a group of valve assemblies 300 and piston pumps 100 are taken as an example for description.

[0047] Please refer to Figures 5 - 6 , in this embodiment, optionally, the pump body 110 has opposite first and second ports. The piston rod 120 is inserted into the pump body 110 from the first port, and the end cover 200 is detachably installed at the second port. A partition 130 is arranged inside the pump body 110, and a first stepped hole 131 and a second stepped hole 132 are arranged on the partition 130. A compression chamber 111 is formed between the partition 130 and the first port to form the compression chamber 111. The smaller-diameter ends of the first stepped hole 131 and the second stepped hole 132 communicate with the compression chamber 111, that is, the smaller-diameter ends of the first stepped hole 131 and the second stepped hole 132 are arranged close to the first port. The first one-way valve 310 is installed at the larger-diameter end of the first stepped hole 131, and the second one-way valve 320 is installed at the larger-diameter end of the second stepped hole 132. The first one-way valve 310 only allows the fluid to flow from the first channel 210 to the compression chamber 111, and the second one-way valve 320 only allows the fluid to flow from the compression chamber 111 to the second channel 220.

[0048] Please refer to 3- Figure 5, Optionally, the piston rod 120 includes a sealing head 121, a rod body 122, and a force transmission head 123. The sealing head 121 and the force transmission head 123 are respectively installed at both ends of the rod body 122. The outer diameter of the rod body 122 is smaller than the outer diameters of the sealing head 121 and the force transmission head 123. The sealing head 121 is slidably disposed in the compression chamber 111, and the sealing head 121 and the inner wall of the compression chamber 111 are in dynamic sealing fit, that is, the sealing performance can be ensured when the sealing head 121 slides relative to the compression chamber 111. And there is a gap between the rod body 122 and the inner wall of the compression chamber 111 to reduce friction. The sealing head 121 can leave the compression chamber 111 from the first port, realizing the disassembly of the piston rod 120 and the pump body 110.

[0049] Furthermore, the piston pump 100 further includes an elastomer 140. The elastomer 140 can be a spring, a spring sheet, etc. For example, in this embodiment, the elastomer 140 is taken as a spring for illustration. The elastomer 140 is sleeved outside the rod body 122. The elastomer 140 is located between the sealing head 121 and the force transmission head 123. One end of the elastomer 140 can abut against the end face of the force transmission head 123 close to the sealing head 121. And after the elastomer 140 and the piston rod 120 are inserted into the compression chamber 111 together, the other end of the elastomer 140 can abut against the inner wall of the compression chamber 111. Thus, when the length of the piston rod 120 inserted into the compression chamber 111 increases, the elastomer 140 is compressed, and the elastomer 140 has an elastic force of elongation, which can drive the piston rod 120 to extend out of the compression chamber 111. Optionally, a stop rod is provided in the compression chamber 111, and the end of the elastomer 140 away from the force transmission head 123 can abut against the stop rod, thereby restricting the position of the elastomer 140 so that the elastomer 140 can be compressed when the piston rod 120 is inserted into the compression chamber 111. By providing the elastomer 140, after the driving head 400 drives the piston rod 120 to be inserted into the compression chamber 111, the driving head 400 does not need to apply a force to pull the piston rod 120 out of the compression chamber 111 anymore. The force for the piston rod 120 to extend out of the compression chamber 111 is provided by the elastomer 140. Thus, when the driving head 400 rotates, it can just press the piston rod 120, and there is no need to design a structure for the driving head 400 to pull the piston rod 120, which simplifies the structure and is convenient for disassembly and assembly.

[0050] It should be noted that the pump bodies 110 of multiple piston pumps 100 can be set as an integral structure, or parts of multiple pump bodies 110 can be integrated together to form a base plate 150. For example, in this embodiment, the parts of multiple pump bodies 110 close to the second ports are integrated together to form a circular base plate 150, and the second ports all extend to the plate surface of the base plate 150 away from the piston rod 120. The outer peripheral surface of the base plate 150 is provided with an external thread, and the plate surface of the base plate 150 away from the piston rod 120 is provided with a first annular groove 151 and a second annular groove 152. A first sealing ring 160 is arranged in the first annular groove 151, and a second sealing ring 170 is arranged in the second annular groove 152. Among them, the four second one-way valves 320 in the four valve assemblies 300 are all located in the area surrounded by the first sealing ring 160, and the four first one-way valves 310 in the four valve assemblies 300 are all located in the area surrounded by the first sealing ring 160 and the second sealing ring 170.

[0051] Please refer to Figure 7 In this embodiment, optionally, the end cover 200 has a first collecting groove 230 and a second collecting groove 240. The first collecting groove 230 is set as an annular groove, and the second collecting groove 240 is set as a circular groove. Specifically, the first collecting groove 230 communicates with the first channel 210, the second collecting groove 240 communicates with the second channel 220, and the first collecting groove 230 is arranged around the second collecting groove 240. The end cover 200 is also provided with an internal thread. A part of the end cover 200 is sleeved outside the base plate 150, and the internal thread of the end cover 200 is screwed with the external thread on the base plate 150. Moreover, the plate surface of the base plate 150 away from the piston rod 120 closes the openings of the first collecting groove 230 and the second collecting groove 240. At the same time, after the end cover 200 is connected to the base plate 150, both the first sealing ring 160 and the second sealing ring 170 are clamped between the end cover 200 and the base plate 150. The first collecting groove 230 is located between the first sealing ring 160 and the second sealing ring 170, the second collecting groove 240 is located in the area surrounded by the second sealing ring 170, and the first sealing ring 160 and the second sealing ring 170 cooperate to realize the sealing and blocking of the first collecting groove 230 and the second collecting groove 240. The four first one-way valves 310 can communicate with the first channel 210 through the first collecting groove 230, and the four second one-way valves 320 can communicate with the second channel 220 through the second collecting groove 240.

[0052] Please refer to Figure 8, in this embodiment, optionally, the medical pump further includes a base 500. The base 500 is provided with a guiding hole 510. One end of the first ports of multiple pump bodies 110 is inserted into the guiding hole 510, and the multiple pump bodies 110 are detachably connected to the base 500, that is, the pump bodies 110 can be pulled out of the guiding hole 510. The driving head 400 is inserted into the guiding hole 510. The driving head 400 is rotatably matched with the base 500, and the driving head 400 can be pulled out of the guiding hole 510. Further, the base 500 is also provided with fixing holes, and bolts can be inserted into the fixing holes to realize the fixed connection between the base 500 and other devices through the bolts.

[0053] Please refer to Figure 9 , in this embodiment, optionally, the driving head 400 includes a connecting plate 410, a driving rod 420 and a transmission rod 430. The driving rod 420 and the transmission rod 430 are both fixedly connected to the connecting plate 410. The driving rod 420 and the transmission rod 430 are coaxially arranged, that is, the axes of the driving rod 420 and the transmission rod 430 are the preset axes. The connecting plate 410 is a circular plate, and the axis of the connecting plate 410 coincides with the preset axis. The driving rod 420 is used to drive the piston rod 120 to expand and contract, and the transmission rod 430 is used to cooperate with the motor. In this way, when the motor is started, it drives the transmission rod 430 to rotate. The transmission rod 430 transmits the torque to the driving rod 420 through the connecting plate 410, and drives the piston rod 120 to move through the driving rod 420.

[0054] Please refer to Figure 9 , optionally, the driving rod 420 can be a hollow rod, and the driving rod 420 has a driving surface 431 away from the connecting plate 410. In one embodiment, the driving surface 431 can be set as a wave surface extending in the circumferential direction of the preset axis, and the wave surface abuts against the piston rod 120. When the position where the wave surface abuts against the piston rod 120 moves from the wave valley 4312 to the wave peak 4311, the wave surface drives the piston rod 120 to move in the direction of inserting into the compression chamber 111; when the position where the wave surface abuts against the piston rod 120 moves from the wave peak 4311 to the wave valley 4312, the elastic body 140 drives the piston rod 120 to extend out of the compression chamber 111. It should be understood that when the number of piston rods 120 is four and two piston rods 120 are in a group, correspondingly, the wave surface has two wave peaks 4311 and two wave valleys 4312. When the two wave peaks 4311 respectively abut against the two piston rods 120 of the first group, the two wave valleys 4312 respectively abut against the two piston rods 120 of the second group.

[0055] Please refer to Figure 10, in another embodiment, the driving surface 431 is arranged as an inclined surface, which can be formed by cutting the driving rod 420 by a cutting plane in a direction having a non-zero included angle with the preset axis. The inclined surface is simultaneously in contact with a plurality of piston rods 120 of a plurality of piston pumps 100. When the driving head 400 rotates, the plurality of piston rods 120 perform continuous operations. At this time, the plurality of piston rods 120 act independently and the strokes change in sequence. That is to say, when the ends of the plurality of piston rods 120 are in contact with the inclined surface, the lengths of each piston rod 120 extending out of the pump body 110 are inconsistent. When the inclined surface rotates, the plurality of piston rods 120 perform telescopic actions in sequence to achieve continuous liquid delivery.

[0056] It should be understood that since the driving surface 431 and the end of the piston rod 120 are in surface contact, and the restoring force is provided by the elastic body 140, thus, there is no need to provide a clamping or grasping mechanism between the driving surface 431 and the piston rod 120 to drive the piston rod 120 to extend out of the pump body 110, which is convenient for the installation and disassembly of the piston pump 100; at the same time, the clamping or grasping mechanism is omitted, the control mode is simplified, and the stability of the whole system is improved.

[0057] In this embodiment, the medical pump is obtained by splicing a plurality of independent components. When the medical pump is cleaned, it can be disassembled into a plurality of independent components for cleaning respectively. There are also no dead corners easily formed inside the pump body 110. The medical pump is convenient to clean, has a good cleaning effect, can be reused repeatedly, is not easily blocked, and has a low use cost.

[0058] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A medical pump, characterized in that, Including: A piston pump, an end cover, a valve assembly and a drive head. The piston pump includes a pump body and a piston rod. The pump body has a compression chamber, and the piston rod is slidably inserted into the compression chamber. The end cover is provided with an independent first channel and a second channel, and the end cover is detachably connected to the piston pump. The valve assembly includes a first one-way valve and a second one-way valve with opposite conduction directions. Both the first one-way valve and the second one-way valve are detachably connected to the compression chamber. The first one-way valve is used to conduct the first channel and the compression chamber when the volume of the compression chamber increases, and the second one-way valve is used to conduct the second channel and the compression chamber when the volume of the compression chamber decreases. The drive head is detachably connected to the pump body, and the drive head is used to rotate around a preset axis to drive the piston rod to reciprocate in the extending direction of the preset axis, so as to adjust the volume of the compression chamber. The piston pump further includes an elastic body, and the elastic body is simultaneously connected to the pump body and the piston rod, and is used to make the piston rod have a tendency to move out of the pump body. The drive head is provided with a first drive surface, and the first drive surface is set as a wave surface extending in the circumferential direction of the preset axis, and the wave surface abuts against the piston rod. When the position where the wave surface abuts against the piston rod moves from the wave trough to the wave peak, the wave surface drives the piston rod to move in the direction of inserting into the compression chamber. When the position where the wave surface abuts against the piston rod moves from the wave peak to the wave trough, the elastic body drives the piston rod to extend out of the compression chamber. Alternatively, the drive head is provided with a second drive surface, and the second drive surface is set as an inclined surface, and the inclined surface abuts against the piston rod. When the position where the inclined surface abuts against the piston rod moves from the high side far from the piston rod to the low side close to the piston rod, the inclined surface drives the piston rod to move in the direction of inserting into the compression chamber. When the position where the inclined surface abuts against the piston rod moves from the low side to the high side, the elastic body drives the piston rod to extend out of the compression chamber. The medical pump further includes a base, the base is provided with a guide hole, the pump body is inserted into the guide hole, and the pump body is detachably connected to the base. The drive head is inserted into the guide hole, and the drive head is rotatably matched with the base.

2. The medical pump according to claim 1, wherein: The number of the piston pumps is multiple. Correspondingly, the number of the valve assemblies is multiple, and the multiple valve assemblies are respectively in one-to-one correspondence with the multiple piston pumps. The first one-way valves of the multiple valve assemblies are all used to conduct the first channel and the compression chamber when the volume of the compression chamber increases, and the second one-way valves of the multiple valve assemblies are all used to conduct the second channel and the compression chamber when the volume of the compression chamber decreases. The drive head cooperates with the piston rods of multiple piston pumps at the same time, and is used to drive the multiple piston rods to move in the extending direction of the preset axis, and the movement directions of at least two of the multiple piston rods are opposite.

3. The medical pump according to claim 2, wherein: The end cap has a first collecting groove and a second collecting groove. The first collecting groove communicates with the first channel, the first collecting groove is arranged around the second collecting groove, and the second collecting groove communicates with the second channel; The pump body closes the openings of the first collecting groove and the second collecting groove.

4. The medical pump according to claim 3, wherein: A first sealing ring and a second sealing ring are arranged between the end cap and the pump body. The first collecting groove is located between the first sealing ring and the second sealing ring, and the second collecting groove is located within the area surrounded by the first sealing ring.

5. The medical pump according to claim 1, wherein: The end cap is threadedly connected to the pump body.

6. The medical pump according to claim 1, wherein: The driving head includes a connecting plate, a driving rod and a transmission rod. The driving rod and the transmission rod are both fixedly connected to the connecting plate. The driving rod is used to drive the piston rod to expand and contract; the transmission rod is used to cooperate with the motor.

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