Connecting structure and ventricular assist device

Abstract

The embodiment of the utility model provides a connecting structure and a ventricular assist device. The connecting structure comprises a connecting plug, a connecting assembly and a read-write chip, one end of the connecting assembly is electrically connected with the connecting plug, the other end of the connecting assembly is electrically connected with the blood pump, and meanwhile, the read-write chip is electrically connected with the connecting assembly, so that when the connecting plug is connected to the control equipment in an inserted mode, the control equipment can be connected to the blood pump and the read-write chip through the connecting plug and the connecting assembly; therefore, the control device controls the blood pump and interacts with the read-write chip, and the read-write chip is arranged close to the connecting plug, so that a signal transmission path between the read-write chip and the control device can be effectively shortened, and the signal transmission efficiency between the read-write chip and the control device is improved.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and in particular, relates to a connection structure and a ventricular assist device. Background Art

[0002] A ventricular assist device is an electromechanical device used to assist cardiac circulation. It is used to partially or completely replace the function of a failing heart and is an active blood circulation support device. A ventricular assist device is usually implanted percutaneously into the patient's body, allowing a blood pump to transport blood from the left ventricle to the aorta, thereby providing the patient with stable blood circulation support during surgery while reducing the burden on the patient's left ventricle.

[0003] At present, the blood pump is usually electrically connected to an external control device through a connection structure, in which one end of the connection component is connected to the blood pump, and the other end is connected to the control device through a plug connector. In addition, a read-write chip is also provided in the connection structure, and the read-write chip is connected to the control device through the connection component and the plug connector to achieve interaction with the control device. However, since the existing read-write chip is far away from the plug connector, the signal transmission path between it and the control device is long, resulting in low signal transmission efficiency between it and the control device. Utility Model Content

[0004] The embodiments of the present application provide a connection structure and a ventricular assist device, which can shorten the signal transmission path between the read-write chip and the control device and improve the signal transmission efficiency between the read-write chip and the control device.

[0005] On the one hand, an embodiment of the present application provides a connection structure, including a plug connector, a connection component and a read-write component, the plug connector is used to be plugged into a control device; one end of the connection component is electrically connected to the plug connector, and the other end is used to be electrically connected to a blood pump; the read-write component includes a read-write chip, the read-write chip is electrically connected to the plug connector through the connection component, and the read-write component is arranged close to the plug connector.

[0006] In some embodiments, the read-write component further includes a communication unit, which is electrically connected to the read-write chip and is used to communicate with a control device or a mobile terminal.

[0007] In some embodiments, the read / write component further includes a circuit board, the read / write chip is disposed on the circuit board, and is electrically connected to the connection component and the communication unit respectively through the circuit board.

[0008] In some embodiments, the read-write component also includes a first connector and a first interface that cooperate with each other, one of the first connector and the first interface is electrically connected to the circuit board, and the other is electrically connected to the communication unit, and the circuit board is electrically connected to the communication unit through the cooperation of the first connector and the first interface.

[0009] In some embodiments, the read-write assembly further includes a first protective shell having a receiving cavity, and the read-write chip is disposed in the receiving cavity.

[0010] In some embodiments, the connecting component includes a first cable, an optical fiber, and a second cable, which are respectively electrically connected to the plug connector. An end of the first cable away from the plug connector and an end of the optical fiber away from the plug connector are respectively used to electrically connect to the blood pump, and an end of the second cable away from the plug connector is electrically connected to the read-write chip.

[0011] In some embodiments, the plug connector includes a first ferrule, a second ferrule, and a third ferrule that are insulated, the first ferrule is electrically connected to the first cable, the second ferrule is electrically connected to the second cable, and the third ferrule is electrically connected to the optical fiber.

[0012] In some embodiments, the optical fiber includes a first optical fiber segment, a second connector, a second interface, and a second optical fiber segment. The first optical fiber segment is electrically connected to the second optical fiber segment through the cooperation of the second connector and the second interface. One end of the first optical fiber segment away from the second optical fiber segment is electrically connected to the plug connector, and one end of the second optical fiber segment away from the first optical fiber segment is used to be electrically connected to a blood pump.

[0013] In some embodiments, the connection assembly further includes a second protective shell, the first cable and the optical fiber respectively pass through the second protective shell, and the second connector and the second interface are located in the second protective shell.

[0014] In a second aspect, an embodiment of the present application further provides a ventricular assist device, comprising a blood pump, a control device, and a connecting structure of any of the above, wherein a connecting component of the connecting structure is electrically connected to the blood pump.

[0015] The embodiment of the present application provides a connection structure and a ventricular assist device. The connection structure includes a plug connector, a connection component and a read-write chip, one end of the connection component is electrically connected to the plug connector, and the other end is electrically connected to the blood pump. At the same time, the read-write chip is electrically connected to the connection component. Therefore, when the plug connector is plugged into the control device, the control device can be connected to the blood pump and the read-write chip through the plug connector and the connection component, respectively, so as to realize the control of the blood pump by the control device and the interaction between the control device and the read-write chip. In addition, since the read-write chip is arranged close to the plug connector, the signal transmission path between the read-write chip and the control device can be effectively shortened, thereby improving the signal transmission efficiency between the read-write chip and the control device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1is a schematic diagram of a connection structure provided in some embodiments of the present application;

[0018] Figure 2 is a schematic diagram of the structure of a read-write component provided in some embodiments of the present application;

[0019] Figure 3 yes Figure 1 AA cross section in;

[0020] Figure 4 yes Figure 1 BB cross-section diagram in.

[0021] Description of Figure Numbers:

[0022] Plug connector 10; first plug core 11; second plug core 12; third plug core 13; thermal resistor pin 14; plug connector grounding plug core 15; connection component 20; first cable 21; optical fiber 22; first optical fiber segment 221; second connector 222; second interface 223; second optical fiber segment 224; second cable 23; thermal resistor cable 24; second protective shell 25; read-write component 30; read-write chip 31; communication unit 32; circuit board 33; first connector 34; first interface 35; first protective shell 36; control device 40. DETAILED DESCRIPTION

[0023] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0025] In order to solve the problems in the prior art, the embodiment of the present application provides a connection structure and a ventricular assist device. The connection structure provided by the embodiment of the present application is first introduced below.

[0026] Figure 1 It is a structural schematic diagram of the connection structure provided in some embodiments of the present application.

[0027] like Figure 1 As shown, on the one hand, an embodiment of the present application provides a connection structure, including a plug connector 10, a connection component 20 and a read-write component 30, the plug connector 10 is used to be plugged into a control device 40; one end of the connection component 20 is electrically connected to the plug connector 10, and the other end is used to be electrically connected to a blood pump; the read-write component 30 includes a read-write chip 31, the read-write chip 31 is electrically connected to the plug connector 10 through the connection component 20, and the read-write component 30 is arranged close to the plug connector 10.

[0028] It should be clear that the connection structure of the present application can be applied to any field to achieve electrical connection between two devices. Preferably, the connection structure of the present application can be applied to the field of medical devices. It can be used in ventricular assist devices to achieve electrical connection between the control device 40 and the blood pump. Of course, the connection structure can also be used in other medical devices to achieve electrical connection between the control device 40 and other medical devices.

[0029] One end of the connecting component 20 is electrically connected to the plug connector 10, and the other end is electrically connected to the blood pump. In addition, the read-write chip 31 is electrically connected to the plug connector 10 through the connecting component 20. Therefore, when the plug connector 10 is plugged into the control device 40, the control device 40 can supply power to the blood pump and the read-write chip 31 respectively, and control the operation of the blood pump and realize interaction with the read-write chip 31.

[0030] The read / write component 30 is disposed close to the plug connector 10, thereby effectively shortening the signal transmission path between the read / write chip 31 and the control device 40, and improving the signal transmission efficiency between the read / write chip 31 and the control device 40. The read / write component 30 is disposed close to the plug connector 10, which may mean that the read / write component 30 is disposed inside the plug connector 10, or may mean that the read / write component 30 is disposed at a position close to the plug connector 10.

[0031] Furthermore, in this embodiment, by placing the read-write component 30 close to the plug connector 10, the distance between the read-write component 30 and the patient can be increased compared to placing it close to the blood pump, thereby preventing the patient from feeling uncomfortable due to the read-write component 30. In addition, when the distance between the read-write component 30 and the patient increases, the read-write component 30 will not vibrate as the patient stands or lies down, thereby preventing the connection between the read-write component 30 and the connection component 20 from loosening or breaking, thereby reducing the risk of poor contact or the device being unable to receive signals.

[0032] It should be clarified that the connection structure in the embodiment of the present application includes a read-write chip 31, and the read-write chip 31 is electrically connected to the plug connector 10 through the connection component 20. Therefore, the connection structure and the blood pump connected to the connection structure can be identified by the read-write chip 31, so that the control device 40 can identify the corresponding blood pump.

[0033] Optionally, the connection assembly 20 may include a first connection section and a second connection section, the first connection section is connected between the plug connector 10 and the second connection section, and the second connection section may be inserted into the patient's body to be electrically connected to the driving motor of the blood pump. It is understandable that the second connection section may include a sheath tube and an electrical connection line disposed in the sheath tube to facilitate insertion into the patient's body.

[0034] Optionally, the read / write chip 31 can be an EEPROM (Electrically Erasable Programmable readonly memory), which includes at least five core pins, including Vcc (ground signal), SCL (serial clock control line), SDA (serial data line), Vss (source), and Wp (write protection).

[0035] Figure 2 It is a schematic diagram of the structure of the read-write component provided in some embodiments of the present application.

[0036] like Figure 2 As shown, in some embodiments, the read-write component 30 further includes a communication unit 32, which is electrically connected to the read-write chip 31, and the communication unit 32 is used to communicate with the control device 40 or the mobile terminal.

[0037] Optionally, the communication unit 32 may be a wired communication unit or a wireless communication unit. When the communication unit 32 is a wireless communication unit, the communication unit 32 may be an RFID (Radio Frequency Identification) signal antenna, which may be connected to a mobile terminal such as a mobile phone or a tablet computer. It is understandable that the communication unit 32 may also be a wireless communication unit based on Bluetooth or a wireless communication unit based on WiFi, which is not limited in this embodiment.

[0038] In this embodiment, by providing a communication unit 32 in the read-write component 30, the communication unit 32 is electrically connected to the read-write chip 31, and thus the communication unit 32 is connected to the control device 40 or the mobile terminal for communication, so as to facilitate the interaction between the control device 40 or the mobile terminal and the read-write chip 31. It can be understood that when the communication unit 32 is connected to the mobile terminal for communication, the mobile terminal can interact with the read-write chip 31 through the communication unit 32, and the mobile terminal can also be connected to the control device 40 for communication, so that the blood pump can be controlled through the control device 40.

[0039] Please continue to refer to Figure 2 In some embodiments, the read / write component 30 further includes a circuit board 33 , and the read / write chip 31 is disposed on the circuit board 33 , and is electrically connected to the connection component 20 and the communication unit 32 through the circuit board 33 .

[0040] In this embodiment, the read / write chip 31 is integrated on the circuit board 33, and the electrical connection with the connection component 20 and the communication unit 32 is realized through the circuit board 33, thereby avoiding the problem of poor signal contact caused by the cold soldering of the pins of the read / write chip 31. At the same time, through the reasonable wiring of the circuit board 33, the welding of the connection component 20 and the circuit board 33 can be facilitated, thereby improving the assembly efficiency.

[0041] Please continue to refer to Figure 2 In some embodiments, the read-write component 30 also includes a first connector 34 and a first interface 35 that cooperate with each other, one of the first connector 34 and the first interface 35 is electrically connected to the circuit board 33, and the other is electrically connected to the communication unit 32, and the circuit board 33 is electrically connected to the communication unit 32 through the cooperation of the first connector 34 and the first interface 35.

[0042] The first connector 34 is plugged into the first interface 35 . The first connector 34 can be arranged on the circuit board 33 and the first interface 35 can be arranged in the communication unit 32 . Alternatively, the first connector 34 can be arranged on the communication unit 32 and the first interface 35 can be arranged on the circuit board 33 .

[0043] In this embodiment, the circuit board 33 improves the cooperation between the first connector 34 and the first interface 35 to achieve electrical connection with the communication unit 32, which facilitates assembly and improves assembly efficiency.

[0044] It can be understood that the first connector 34 and the first interface 35 can drive the amplification of the read / write chip 31 to be transmitted to the control device 40 or the wireless terminal through the communication unit 32 .

[0045] Please continue to refer to Figure 2In some embodiments, the read-write component 30 also includes a first protective shell 36 having an accommodating cavity, and the read-write chip 31 is arranged in the accommodating cavity, thereby protecting the read-write chip 31 and improving the service life of the read-write chip 31.

[0046] It is understandable that the communication unit 32 and the circuit board 33 may also be disposed in the first protective shell 36 to be protected by the first protective shell 36 .

[0047] Optionally, the first protective shell 36 may include a shell and a shell cover disposed on the shell, and the shell cover is buckled on the shell, so that the first protective shell 36 can be easily opened.

[0048] Figure 3 yes Figure 1 AA cross-section diagram in.

[0049] like Figure 3 As shown, in some embodiments, the connection component 20 includes a first cable 21, an optical fiber 22, and a second cable 23, which are respectively electrically connected to the plug connector 10, an end of the first cable 21 away from the plug connector 10 and an end of the optical fiber 22 away from the plug connector 10 are respectively used for electrical connection to the blood pump, and an end of the second cable 23 away from the plug connector 10 is electrically connected to the read-write chip 31.

[0050] The optical fiber 22 is used to convert the optical signal at the patient's heart into an electrical signal, output the current value and convert it into a pressure fluctuation signal, so that the control device 40 can generate the patient's heart pressure change curve according to the pressure fluctuation signal, and adjust the driving motor of the blood pump according to the changes in the heart pressure change curve.

[0051] The first cable 21 can be a driving cable of the blood pump, and the first cable 21 connects the blood pump and the plug connector 10. The second cable 23 can be a power cable for the read-write chip 31 and the communication unit 32, and the second cable 23 connects the read-write chip 31 and the plug connector 10. When the plug connector 10 is plugged into the control device 40, the control device 40 can supply power to the driving motor of the blood pump and control the operation of the driving motor through the first cable 21. At the same time, the control device 40 can also supply power to the read-write chip 31 through the second cable 23 and realize interaction with the read-write chip 31.

[0052] The number of the first cables 21 may be multiple, and the multiple first cables 21 may be arranged at intervals along the circumference of the optical fiber 22. For example, the number of the first cables 21 may be four, and the four first cables 21 may be arranged at intervals along the circumference of the optical fiber 22, thereby improving the stability of signal transmission between the control device 40 and the blood pump. It is understandable that the multiple first cables 21 may be the U-phase cable, V-phase cable, W-phase cable and ground cable of the driving motor of the blood pump.

[0053] The number of the second cables 23 may be multiple, and the multiple second cables 23 may be arranged at intervals along the circumference of the optical fiber 22. For example, the number of the second cables 23 may be three, and the three second cables 23 are arranged at intervals along the circumference of the optical fiber 22, thereby improving the stability of signal transmission between the control device 40 and the read-write chip 31. It can be understood that when the number of the first cables 21 and the number of the second cables 23 are multiple, the multiple first cables 21 and the multiple second cables 23 may be arranged at intervals along the circumference of the optical fiber 22 in sequence.

[0054] Optionally, the connection assembly 20 may further include a thermal resistance cable 24, which is used to monitor the temperature change in the connection assembly 20, thereby improving the safety performance of the connection assembly 20. Further, the thermal resistance cable 24 may include a positive thermal resistance cable and a negative thermal resistance cable, and the positive thermal resistance cable and the negative thermal resistance cable may be arranged at intervals along the circumference of the optical fiber 22.

[0055] Figure 4 yes Figure 1 BB cross-section diagram in.

[0056] like Figure 4 As shown, in some embodiments, the plug connector 10 includes a first ferrule 11, a second ferrule 12 and a third ferrule 13 which are insulated, the first ferrule 11 is electrically connected to the first cable 21, the second ferrule 12 is electrically connected to the second cable 23, and the third ferrule 13 is electrically connected to the optical fiber 22.

[0057] The first ferrule 11, the second ferrule 12 and the third ferrule 13 are respectively used to be plugged into the control device 40, the first ferrule 11 is electrically connected to the first cable 21, the second ferrule 12 is electrically connected to the second cable 23, and the third ferrule 13 is electrically connected to the optical fiber 22, thereby respectively realizing the electrical connection between the first cable 21 and the control device 40, the electrical connection between the second cable 23 and the control device 40, and the electrical connection between the optical fiber 22 and the control device 40, with a simple structure and easy assembly.

[0058] The number of the first ferrules 11 is adapted to the number of the first cables 21. When the number of the first cables 21 is multiple, the number of the first ferrules 11 is also multiple, and the multiple first ferrules 11 are connected one-to-one with the multiple first cables 21. It can be understood that the multiple first ferrules 11 can be the U-phase ferrule, V-phase ferrule, W-phase ferrule of the driving motor of the blood pump and the grounding ferrule of the driving motor.

[0059] The number of the second ferrules 12 matches the number of the second cables 23 . When there are multiple second cables 23 , there are also multiple second ferrules 12 . The multiple second ferrules 12 are connected to the multiple second cables 23 in a one-to-one correspondence.

[0060] Optionally, the plug connector 10 also includes a thermistor pin 14, which is electrically connected to the thermistor cable 24. The thermistor pin 14 may include a positive thermistor pin and a negative thermistor pin. The positive thermistor pin is electrically connected to the positive thermistor cable, and the negative thermistor pin is electrically connected to the negative thermistor cable. Therefore, when the plug connector 10 is plugged into the control device 40, the control device 40 can supply power to the thermistor cable 24 through the thermistor pin 14.

[0061] Optionally, the plug connector 10 further includes a plug connector grounding core 15 , thereby improving the safety performance of the plug connector 10 .

[0062] Please continue to refer to Figure 1 In some embodiments, the optical fiber 22 includes a first optical fiber segment 221, a second connector 222, a second interface 223 and a second optical fiber segment 224. The first optical fiber segment 221 is electrically connected to the second optical fiber segment 224 through the cooperation of the second connector 222 and the second interface 223. An end of the first optical fiber segment 221 away from the second optical fiber segment 224 is electrically connected to the plug connector 10, and an end of the second optical fiber segment 224 away from the first optical fiber segment 221 is used to be electrically connected to the blood pump.

[0063] It can be understood that, in the connection assembly 20, the first cable 21 and the optical fiber 22 are both connected between the blood pump and the control device 40, and their lengths are usually long, making them difficult to assemble.

[0064] Therefore, in this embodiment, the first optical fiber segment 221 and the second optical fiber segment 224 in the optical fiber 22 are electrically connected by plugging the second interface 223 and the second connector 222, thereby reducing the difficulty of assembly and making assembly convenient.

[0065] In some embodiments, the connecting component 20 also includes a second protective shell 25, the first cable 21 and the optical fiber 22 pass through the second protective shell 25 respectively, and the second connector 222 and the second interface 223 are located in the second protective shell 25, so as to protect the first cable 21 and the optical fiber 22, and prevent the first connector 34 and the second interface 223 from falling off due to accidents.

[0066] In a second aspect, an embodiment of the present application further provides a ventricular assist device, including a blood pump, a control device, and a connection structure of any of the above items, wherein a connection component 20 of the connection structure is electrically connected to the blood pump.

[0067] In some embodiments, the ventricular assist device further includes a perfusion module, which may include a perfusion pipeline for supplying perfusion fluid, one end of which is inserted into the patient's body and connected to the blood pump. The perfusion pipeline includes a perfusion input pipeline that guides the perfusion fluid to flow to the distal end of the blood pump. Optionally, the perfusion pipeline also includes a perfusion recovery pipeline for recovering the perfusion waste liquid. Optionally, the perfusion pipeline can be arranged inside the sheath together with the first cable 21, the second cable 23, the optical fiber 22, and the thermal resistor cable 24 in the connection component 20, and is coated as an integral structure by the sheath, so that it can be inserted into the patient's body at the same time. Alternatively, the perfusion pipeline can also be arranged outside the sheath for coating the connection component 20, which is an independent component from the connection component 20 and is inserted into the patient's body respectively. As another specific embodiment, the first cable 21, the second cable 23, the optical fiber 22, and the thermal resistor cable 24 of the connection component 20 of the present application can also be arranged inside the perfusion pipeline, which is coated as an integral structure by the pipe wall of the perfusion pipeline to be inserted into the patient's body at the same time.

[0068] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A connection structure, characterized in that: include: A plug connector, the plug connector being used to be plugged into a control device; A connecting component, one end of which is electrically connected to the plug connector, and the other end of which is electrically connected to the blood pump; A read-write component, the read-write component includes a read-write chip, the read-write chip is electrically connected to the plug connector through the connection component, and the read-write component is arranged close to the plug connector.

2. The connection structure according to claim 1, characterized in that: The read-write component also includes a communication unit, which is electrically connected to the read-write chip and is used for communication connection with a control device or a mobile terminal.

3. The connection structure according to claim 2, characterized in that: The read-write component also includes a circuit board. The read-write chip is arranged on the circuit board and is electrically connected to the connection component and the communication unit respectively through the circuit board.

4. The connection structure according to claim 3, characterized in that: The read-write component also includes a first connector and a first interface that cooperate with each other, one of the first connector and the first interface is electrically connected to the circuit board, and the other is electrically connected to the communication unit, and the circuit board is electrically connected to the communication unit through the cooperation of the first connector and the first interface.

5. The connection structure according to claim 1, characterized in that: The read-write assembly also includes a first protective shell having a receiving cavity, and the read-write chip is arranged in the receiving cavity.

6. The connection structure according to any one of claims 1 to 5, characterized in that: The connecting component includes a first cable, an optical fiber and a second cable respectively electrically connected to the plug connector, an end of the first cable away from the plug connector and an end of the optical fiber away from the plug connector are respectively used to electrically connect to the blood pump, and an end of the second cable away from the plug connector is electrically connected to the read-write chip.

7. The connection structure according to claim 6, characterized in that: The plug connector includes a first ferrule, a second ferrule and a third ferrule which are insulated. The first ferrule is electrically connected to the first cable, the second ferrule is electrically connected to the second cable, and the third ferrule is electrically connected to the optical fiber.

8. The connection structure according to claim 6, characterized in that: The optical fiber includes a first optical fiber segment, a second connector, a second interface and a second optical fiber segment. The first optical fiber segment is electrically connected to the second optical fiber segment through the cooperation of the second connector and the second interface. An end of the first optical fiber segment away from the second optical fiber segment is electrically connected to the plug connector, and an end of the second optical fiber segment away from the first optical fiber segment is used to be electrically connected to the blood pump.

9. The connection structure according to claim 8, characterized in that: The connection assembly also includes a second protective shell, the first cable and the optical fiber pass through the second protective shell respectively, and the second connector and the second interface are located in the second protective shell.

10. A ventricular assist device, characterized in that: It comprises a blood pump, a control device and a connection structure as described in any one of claims 1 to 9, wherein a connection component of the connection structure is electrically connected to the blood pump.

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