Dynamic sealing structure in ECMO blood pump

Abstract

The utility model discloses a dynamic sealing structure in an ECMO blood pump, which belongs to the technical field of pump body sealing, and comprises a dynamic sealing element, the dynamic sealing element comprises a sealing main body and a static sealing part arranged on the side surface of the sealing main body, the static sealing part is sleeved on the outer side of the sealing main body, and an inclined spring ring is embedded in the upper end of the sealing main body. The inclined spring ring is movably installed in a groove formed in the upper end of the sealing body, the inclined spring ring is utilized in the sealing body, it is ensured that the sealing body made of Teflon materials generates constant pressure on the shaft rod within the manufacturing and assembling deviation range, the Teflon friction coefficient is extremely small, self-lubrication is high, reliable sealing of the position of the shaft rod and the sealing body can be achieved, and the sealing effect is good. The purpose of low heat production during high-speed rotation is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pump body sealing, and in particular relates to a dynamic sealing structure in an ECMO blood pump. Background Art

[0002] Extracorporeal membrane oxygenation (ECMO) is mainly used to provide continuous extracorporeal respiration and circulation to patients with severe cardiopulmonary failure in order to maintain their lives. The core parts of ECMO are the membrane lung (artificial lung) and the blood pump (artificial heart), which can provide long-term cardiopulmonary support to patients with severe cardiopulmonary failure and buy precious time for the rescue of critical illnesses. The blood pump is mainly used to control blood flow in the human body.

[0003] During the operation of the blood pump, special attention should be paid to the sealing problem inside the pump body. Poor sealing can easily lead to unstable rotation of the internal impeller and serious damage to the pump body, affecting the patient's use effect. During the use of the pump body, the rotation of the impeller can easily lead to serious wear of the seal, affecting the service life of the pump body. Utility Model Content

[0004] The utility model aims to provide a dynamic sealing structure in an ECMO blood pump to solve the problem in the background technology that the rotation of the impeller easily leads to greater wear of the seal, thereby affecting the service life of the pump body.

[0005] To achieve the above purpose, the specific technical solution of the utility model is as follows: a dynamic sealing structure in an ECMO blood pump, comprising

[0006] The dynamic seal includes a sealing body and a static sealing part arranged on the side of the sealing body. The static sealing part is sleeved on the outside of the sealing body. The upper end of the sealing body is also embedded with an italic spring ring, which is movably installed in a groove set at the upper end of the sealing body.

[0007] Preferably, a groove is formed on the side of the sealing body, and a static sealing part is installed thereon, and the static sealing part is embedded and installed inside the groove.

[0008] Preferably, the static sealing portion is an O-ring made of rubber material.

[0009] Preferably, the dynamic seal is installed on the outside of the shaft rod arranged at the lower end of the center of the lower cover of the impeller in the ECMO blood pump, and a through hole is opened through the center of the sealing body, and the through hole can allow the shaft rod to pass through for installation.

[0010] Preferably, the impeller lower cover is placed inside a pump chamber opened inside a pump lower cover and a pump upper cover in an ECMO blood pump, and the dynamic seal is adapted to the size of the pump chamber.

[0011] Preferably, a main sealing lip and a secondary sealing lip are provided on the inner side of the sealing body, and the main sealing lip and the secondary sealing lip are installed in contact with the outer surface of the shaft.

[0012] Preferably, the sealing body is a component made of Teflon material.

[0013] Preferably, the italic spring coil is a component made of stainless steel material.

[0014] The dynamic sealing structure in an ECMO blood pump of the utility model has the following advantages:

[0015] The dynamic seal structure in an ECMO blood pump has a main seal and a secondary seal through a sealing body and a static sealing part, and the double insurance is more reliable. An italic spring coil is used in the sealing body to ensure that within the manufacturing and assembly deviation range, the sealing body made of Teflon material exerts a constant pressure on the shaft. Teflon has an extremely small friction coefficient and strong self-lubrication, so that a reliable seal can be achieved between the shaft and the sealing body, and the goal of generating less heat during high-speed rotation can be achieved. The dynamic seal has a simple structure, and is easy to assemble and manufacture, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the structure of the ECMO blood pump cover of the utility model;

[0018] Figure 2 This is a schematic diagram of the installation position structure of the dynamic seal of the utility model;

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the installation position of the dynamic seal of the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the dynamic seal of the utility model;

[0021] Figure 5 It is a schematic diagram of the cross-sectional structure of the dynamic seal of the utility model.

[0022] Explanation of marks in the figure: 100, pump lower cover; 110, pump upper cover; 120, pump chamber; 200, impeller lower cover; 210, shaft; 300, dynamic seal; 310, sealing body; 311, primary sealing lip; 312, secondary sealing lip; 320, italic spring ring; 330, static sealing part; 340, through hole. DETAILED DESCRIPTION

[0023] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0024] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of 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 therefore cannot be understood as a limitation on the embodiments of the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0028] In order to better understand the purpose, structure and function of the present invention, the dynamic sealing structure in an ECMO blood pump of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0029] like Figure 1-Figure 5 As shown, a dynamic sealing structure in an ECMO blood pump of the utility model includes a dynamic seal 300, and the dynamic seal 300 includes a sealing body 310 for main sealing and a static sealing part 330 arranged on the side of the sealing body 310, the static sealing part 330 is sleeved on the outer side of the sealing body 310, and the upper end of the sealing body 310 is also embedded with an oblique spring coil 320 for providing constant pressure, and the oblique spring coil 320 is movably installed in a groove set at the upper end of the sealing body 310.

[0030] The dynamic seal 300 is installed on the outside of the shaft 210 set at the lower end of the center of the impeller lower cover 200 in the ECMO blood pump. A through hole 340 is opened in the center of the sealing body 310, and the through hole 340 can be passed through by the shaft 210 for installation. The impeller lower cover 200 is placed in the pump cavity 120 opened inside the pump lower cover 100 and the pump upper cover 110 in the ECMO blood pump. The size of the dynamic seal 300 is adapted to the pump cavity 120.

[0031] The inner side of the sealing body 310 is provided with a main sealing lip 311 and a secondary sealing lip 312 for sealing the shaft 210. The main sealing lip 311 and the secondary sealing lip 312 are installed in contact with the outer surface of the shaft 210. The italic spring ring 320 is sleeved on the outside of the main sealing lip 311 to provide constant pressure to the main sealing lip 311 to ensure that the main sealing lip 311 and the surface of the shaft 210 are reliably sealed.

[0032] The dynamic seal 300 is divided into a main seal and a secondary seal through a sealing body 310 and a static sealing part 330, and the double insurance is more reliable. The sealing body 310 uses an italic spring coil 320 to ensure that within the manufacturing and assembly deviation range, the sealing body 310 made of Teflon material produces a constant pressure on the shaft 210. Teflon has an extremely small friction coefficient and strong self-lubrication, which can achieve reliable sealing between the shaft 210 and the sealing body 310, and achieve the goal of generating less heat during high-speed rotation.

[0033] The sealing body 310 is a component made of Teflon material, the italic spring ring 320 is a component made of stainless steel material, and the static sealing part 330 is an O-ring made of rubber material, which has strong biocompatibility and meets the biocompatibility requirements.

[0034] A working principle of a dynamic sealing structure in an ECMO blood pump: The dynamic seal 300 is divided into a main seal and a secondary seal through a sealing body 310 and a static sealing part 330. The double insurance is more reliable. An italic spring coil 320 is used in the sealing body 310 to ensure that within the manufacturing and assembly deviation range, the sealing body 310 made of Teflon material exerts a constant pressure on the shaft 210. The friction coefficient of Teflon is extremely small and the self-lubrication is strong, so that the shaft 210 and the sealing body 310 can achieve reliable sealing and achieve the goal of generating less heat during high-speed rotation.

[0035] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A dynamic sealing structure in an ECMO blood pump, characterized in that: include A dynamic seal (300) comprises a sealing body (310) and a static sealing portion (330) arranged on the side of the sealing body (310); the static sealing portion (330) is sleeved on the outer side of the sealing body (310); an oblique spring ring (320) is also embedded and installed at the upper end of the sealing body (310); the oblique spring ring (320) is movably installed in a groove arranged at the upper end of the sealing body (310).

2. The dynamic sealing structure in the ECMO blood pump according to claim 1, characterized in that: A groove is provided on the side of the sealing body (310), and a static sealing part (330) is installed thereon. The static sealing part (330) is embedded and installed inside the groove.

3. The dynamic sealing structure in the ECMO blood pump according to claim 2, characterized in that: The static sealing portion (330) is an O-ring made of rubber material.

4. The dynamic sealing structure in the ECMO blood pump according to claim 3, characterized in that: The dynamic seal (300) is installed on the outside of the shaft (210) arranged at the lower end of the center of the impeller lower cover (200) in the ECMO blood pump. A through hole (340) is opened through the center of the sealing body (310), and the through hole (340) can allow the shaft (210) to pass through for installation.

5. The dynamic sealing structure in the ECMO blood pump according to claim 4, characterized in that: The impeller lower cover (200) is placed inside a pump chamber (120) opened inside a pump lower cover (100) and a pump upper cover (110) in an ECMO blood pump, and the dynamic seal (300) is adapted in size to the pump chamber (120).

6. The dynamic sealing structure in the ECMO blood pump according to claim 5, characterized in that: A main sealing lip (311) and a secondary sealing lip (312) are provided on the inner side of the sealing body (310), and the main sealing lip (311) and the secondary sealing lip (312) are installed in contact with the outer surface of the shaft (210).

7. The dynamic sealing structure in the ECMO blood pump according to claim 6, characterized in that: The sealing body (310) is a component made of Teflon material.

8. The dynamic sealing structure in the ECMO blood pump according to claim 7, characterized in that: The italic spring coil (320) is a component made of stainless steel.

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