Piston for medical piston pump

Abstract

The utility model belongs to the technical field of medical piston pumps, and particularly relates to a piston for a medical piston pump, which comprises a hollow column, a cavity is arranged in the hollow column, a first notch is arranged on the hollow column, two groups of fixing rings are fixedly mounted on the first notch, an annular air bag and an annular sealing rubber pad are mounted between the two groups of fixing rings, and the annular air bag and the annular sealing rubber pad are fixedly mounted on the hollow column. The annular air bag makes contact with the hollow column, the annular sealing rubber pad wraps the outer side of the annular air bag, the hollow column is sleeved with the pump cylinder, the annular sealing rubber pad makes contact with the inner surface of the pump cylinder, and the annular air bag is sleeved with the annular sealing rubber pad so that the annular sealing rubber pad can make close contact with the inner surface of the pump cylinder. When the annular sealing rubber pad is abraded, the annular air bag is inflated with air, so that the annular air bag is expanded, the annular sealing rubber pad is expanded outwards, the effect of compensating the abrasion degree is achieved, and the situation that the piston pump cannot work normally suddenly is effectively avoided through the design.

Description

Technical Field

[0001] This utility model relates to the field of medical piston technology, specifically a piston for a medical piston pump. Background Technology

[0002] A medical piston pump is a volumetric delivery device that precisely controls drug delivery through the reciprocating motion of a piston. It is commonly used in situations requiring strict control of infusion rate and dosage, such as the treatment and resuscitation of critically ill patients, cardiovascular disease patients, and children, as well as the infusion of chemotherapy drugs and nutritional solutions. One of its core components is the piston.

[0003] In the daily use of existing medical piston pumps, the sealing rings on the piston will wear down. When the wear of the sealing rings on the internal piston of the piston pump reaches a certain value during use, the sealing rings will not be able to play a good sealing role, thus causing the piston pump to malfunction. In order to avoid this situation, we propose a piston for medical piston pumps.

[0004] We propose a piston for a medical piston pump. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a piston for a medical piston pump. By fitting an annular sealing rubber gasket around the outside of the annular airbag, the annular sealing rubber gasket is brought into close contact with the inner surface of the pump cylinder. When the annular sealing rubber gasket wears, the annular airbag is inflated, causing it to expand and thus expanding the annular sealing rubber gasket outward, thereby compensating for wear. This design effectively prevents the piston pump from suddenly failing to work properly and solves the problems mentioned earlier.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A piston for a medical piston pump includes a hollow column with a cavity inside. A first slot is formed on the hollow column, and two sets of fixing rings are fixedly installed on the first slot. An annular airbag and an annular sealing rubber gasket are installed between the two sets of fixing rings. The annular airbag is in contact with the hollow column, and the annular sealing rubber gasket is wrapped around the outside of the annular airbag. A pump cylinder is fitted around the hollow column, and the annular sealing rubber gasket is in contact with the inner surface of the pump cylinder.

[0008] Preferably, the hollow column has a threaded hole, and a hollow piston tube is threadedly connected to the hollow column. The bottom of the hollow piston tube has a threaded section, and the hollow piston tube is fixedly connected to the cavity.

[0009] Preferably, the hollow column has an installation hole, the annular sealing rubber gasket has an inflation valve installed on it, the inflation valve is fitted with a small sealing ring, and the inflation valve is inserted into the installation hole and communicates with the cavity.

[0010] Preferably, the hollow column has a first mounting slot and a second mounting slot. A first annular sealing ring is installed in the first mounting slot, and a second annular sealing ring is installed in the second mounting slot. Both the first and second annular sealing rings are in contact with the inner surface of the pump cylinder.

[0011] Preferably, an inflation tube is fixedly connected to the hollow piston tube, and a pressure sensor is fixedly installed at the bottom of the hollow piston tube.

[0012] Preferably, a conical top is fixedly installed at the bottom of the hollow column. Beneficial effects

[0013] This invention provides a piston for a medical piston pump. Compared with the prior art, it has the following advantages:

[0014] This medical piston pump piston uses an annular sealing rubber gasket fitted on the outside of an annular air bladder, allowing the annular sealing rubber gasket to make close contact with the inner surface of the pump cylinder. When the annular sealing rubber gasket wears, the annular air bladder is inflated with gas, causing the annular air bladder to expand and thus expanding the annular sealing rubber gasket outward, thereby compensating for the wear. This design effectively avoids situations where the piston pump suddenly fails to work properly.

[0015] This medical piston pump piston, by setting a first annular sealing ring, a second annular sealing ring and an annular sealing rubber gasket, can effectively improve the sealing performance of the piston when it is working in the pump cylinder. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0017] Figure 2 This is a schematic diagram of the present invention without the pump cylinder;

[0018] Figure 3 This is a top view of the hollow column of this utility model;

[0019] Figure 4 This is a bottom view of the hollow column of this utility model;

[0020] Figure 5 This is a schematic diagram of the interior of the hollow column of this utility model;

[0021] Figure 6 This utility model Figure 2 Enlarged diagram of point A in the middle.

[0022] In the diagram: 1. Pump cylinder; 2. Hollow piston tube; 3. Inflation tube; 4. Annular airbag; 5. Threaded section; 6. Pressure sensor; 7. Annular sealing rubber gasket; 8. First annular sealing ring; 9. Second annular sealing ring; 10. First groove; 11. Hollow column; 12. Threaded hole; 13. Retaining ring; 14. First mounting groove; 15. Second mounting groove; 16. Conical top; 17. Mounting hole; 18. Cavity; 19. Inflation valve; 20. Small sealing ring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-6 This utility model provides a technical solution: a piston for a medical piston pump, including a hollow column 11, with a cavity 18 inside the hollow column 11. A first slot 10 is formed on the hollow column 11, and two sets of fixing rings 13 are fixedly installed on the first slot 10. An annular airbag 4 and an annular sealing rubber gasket 7 are installed between the two sets of fixing rings 13. The annular airbag 4 is in contact with the hollow column 11, and the annular sealing rubber gasket 7 wraps around the outside of the annular airbag 4. A pump cylinder 1 is fitted over the hollow column 11, and the annular sealing rubber gasket 7 is in contact with the inner surface of the pump cylinder 1. The hollow piston tube 2 is fixedly connected to an inflation tube 3, and a pressure sensor 6 is fixedly installed at the bottom of the hollow piston tube 2; a threaded hole 12 is opened on the hollow column 11, and the hollow piston tube 2 is threadedly connected to the hollow column 11; a threaded section 5 is provided at the bottom of the hollow piston tube 2, and the hollow piston tube 2 is fixedly connected to the cavity 18; an installation hole 17 is opened on the hollow column 11, an inflation valve 19 is installed on the annular sealing rubber gasket 7, a small sealing ring 20 is fitted on the inflation valve 19, and the inflation valve 19 is inserted into the installation hole 17 and connected to the cavity 18;

[0025] In use, insert the inflation valve 19 into the mounting hole 17 to connect the annular airbag 4 to the cavity 18, and then fit the annular airbag 4 onto the hollow column 11. Next, install the annular sealing rubber gasket 7 onto the two sets of retaining rings 13, allowing the annular airbag 4 to lift the annular sealing rubber gasket 7. The retaining rings 13 can also be used to limit the position of the annular airbag 4. Then, with the cooperation of the threaded hole 12 and the threaded section 5, thread the hollow piston tube 2 onto the hollow column 11, connecting the hollow piston tube 2 to the cavity 18. The small sealing ring 20 can... To improve the sealing between the annular airbag 4 and the cavity 18; when the annular sealing rubber gasket 7 wears, the air pressure inside the annular airbag 4 will decrease, and then the air pressure sensor 6 will detect the decrease in air pressure inside the hollow piston tube 2. Subsequently, gas will enter the hollow piston tube 2 from the inflation tube 3, then enter the cavity 18, and finally enter the annular airbag 4. When the air pressure reaches a certain value, inflation will stop. In actual use, the air pressure inside the annular airbag 4 will continue to change, and air will only be added to the annular airbag 4 when the air pressure drops to a certain value.

[0026] The hollow column 11 has a first mounting slot 14 and a second mounting slot 15. A first annular sealing ring 8 is installed in the first mounting slot 14, and a second annular sealing ring 9 is installed in the second mounting slot 15. Both the first annular sealing ring 8 and the second annular sealing ring 9 are in contact with the inner surface of the pump cylinder 1. Both the first annular sealing ring 8 and the second annular sealing ring 9 can increase the sealing performance of the piston when it is working in the pump cylinder 1.

[0027] A conical head 16 is fixedly installed at the bottom of the hollow column 11; the design of the conical head can optimize the fluid dynamics performance, which helps to change the flow rate and distribution of the fluid, improve the smoothness of the fluid, and thus improve the working efficiency of the pump.

[0028] Working principle: In use, insert the inflation valve 19 into the mounting hole 17 to connect the annular airbag 4 with the cavity 18, and then fit the annular airbag 4 onto the hollow column 11. Next, install the annular sealing rubber gasket 7 onto the two sets of fixing rings 13, allowing the annular airbag 4 to lift the annular sealing rubber gasket 7. The fixing rings 13 can also be used to restrict the position of the annular airbag 4. Then, with the cooperation of the threaded hole 12 and the threaded section 5, thread the hollow piston tube 2 onto the hollow column 11 to connect the hollow piston tube 2 with the cavity 18. Finally, fit the first annular sealing ring 8 into the first mounting slot 14 and the second annular sealing ring 9 into the second mounting slot 15. The small sealing ring 20 can be lifted... The sealing between the high-pressure annular airbag 4 and the cavity 18 is ensured. When the annular sealing rubber gasket 7 wears, the air pressure inside the annular airbag 4 decreases. Subsequently, the air pressure sensor 6 detects the decrease in air pressure inside the hollow piston tube 2. Gas then enters the hollow piston tube 2 from the inflation tube 3, then enters the cavity 18, and finally enters the annular airbag 4. Inflation stops when the air pressure reaches a certain value. In actual use, the air pressure inside the annular airbag 4 will continuously change. Inflation will only begin when the air pressure drops to a certain value. The design of the conical top 16 optimizes fluid dynamics performance. It helps to change the flow rate and distribution of the fluid, improves the smoothness of the fluid, and thus improves the pump's working efficiency.

[0029] This device uses multiple sets of sealing elements, which greatly improves the sealing performance of the piston when it is working in the pump cylinder 1. The annular airbag 4 and the annular sealing rubber gasket 7 are easy to assemble and disassemble. At the same time, when the annular sealing rubber gasket 7 is worn, the annular airbag 4 will be filled with gas, which will cause the annular airbag 4 to expand and expand the annular sealing rubber gasket 7 outward, thereby compensating for the wear. This design effectively avoids the situation where the piston pump suddenly fails to work properly.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A piston for a medical piston pump, comprising a hollow column (11), characterized in that: The hollow column (11) has a cavity (18) inside. The hollow column (11) has a first slot (10) on it. Two sets of fixing rings (13) are fixedly installed on the first slot (10). An annular airbag (4) and an annular sealing rubber pad (7) are installed between the two sets of fixing rings (13). The annular airbag (4) is in contact with the hollow column (11). The annular sealing rubber pad (7) is wrapped around the outside of the annular airbag (4). The hollow column (11) is fitted with a pump cylinder (1). The annular sealing rubber pad (7) is in contact with the inner surface of the pump cylinder (1).

2. The piston for a medical piston pump according to claim 1, characterized in that: The hollow column (11) has a threaded hole (12) and a hollow piston tube (2) is threadedly connected to the hollow column (11). The bottom of the hollow piston tube (2) is provided with a threaded section (5) and the hollow piston tube (2) is fixedly connected to the cavity (18).

3. The piston for a medical piston pump according to claim 1, characterized in that: The hollow column (11) has an installation hole (17), and an inflation valve (19) is installed on the annular sealing rubber pad (7). A small sealing ring (20) is fitted on the inflation valve (19), and the inflation valve (19) is inserted into the installation hole (17) and communicates with the cavity (18).

4. The piston for a medical piston pump according to claim 1, characterized in that: The hollow column (11) is provided with a first mounting slot (14) and a second mounting slot (15). A first annular sealing ring (8) is installed in the first mounting slot (14), and a second annular sealing ring (9) is installed in the second mounting slot (15). Both the first annular sealing ring (8) and the second annular sealing ring (9) are in contact with the inner surface of the pump cylinder (1).

5. A piston for a medical piston pump according to claim 2, characterized in that: An air inlet tube (3) is fixedly connected to the hollow piston tube (2), and a pressure sensor (6) is fixedly installed at the bottom of the hollow piston tube (2).

6. The piston for a medical piston pump according to claim 5, characterized in that: A conical top (16) is fixedly installed at the bottom of the hollow column (11).

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