Sealing assembly, infusion device and infusion system

Abstract

The present invention provides a sealing assembly, an infusion device and an infusion system. The sealing assembly includes a base, a rotating shaft and a first seal. The base has a first receiving cavity and a first through hole axially penetrating the first receiving cavity; the first seal is disposed in the first receiving cavity and is configured to be relatively fixed to the first receiving cavity. The first seal has a second through hole coaxially disposed with the first through hole. The rotating shaft rotatably passes through the first through hole and the second through hole. The second through hole has a first inner peripheral surface adjacent to the rotating shaft; the rotating shaft includes a smooth section, the smooth section is in interference fit with the first inner peripheral surface, and the surface roughness Ra of the smooth section is not greater than 6.3 μm. With such a configuration, when the rotating shaft rotates, dynamic liquid prevention can be achieved through the first seal relative to the base.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a sealing component, an infusion device and an infusion system. Background Art

[0002] Infusion devices are one of the most commonly used supplies in the medical field, used to achieve continuous infusion of liquid medicine, and are widely used in the treatment of diseases such as diabetes and hypogonadotropic hypogonadism.

[0003] Existing portable infusion systems generally include an input / output interface, a controller, a driver, a transmission component, a steering component, a piston and a liquid reservoir. The controller controls the driver to rotate a certain number of turns at a specific time according to the parameters provided by the input / output interface, so that the liquid reservoir discharges a specified dose of liquid medicine. The transmission component, such as a gear set, transmits the power of the driver to the steering component. The steering component, such as a nut-screw structure, converts the rotation output by the transmission component into an axial movement, and drives the piston to move relative to the liquid reservoir to discharge the liquid medicine.

[0004] However, infusion systems with this structure all have the problem that the liquid medicine in the liquid reservoir overflows to the steering component and even flows into the transmission component. On the one hand, the overflow of the liquid medicine may cause contamination of the liquid medicine, and on the other hand, it may cause the failure of components such as sensors in the transmission system, posing a risk to the human body. The anti-liquid design of existing axially-driven portable infusion systems all adopts a gasket anti-liquid design. Specifically, as Figure 1 shown, the infusion system includes a base A1 and a housing (not marked in the figure). The housing has a liquid storage chamber A2 for accommodating a liquid reservoir A3, and the housing is detachably connected to the base A1. Further, the base A1 includes a receiving chamber A4 provided on one side and a boss A5 on the other side, and the boss A5 is used to cooperate with a silicone gasket A6. A rotatable driven gear is provided in the receiving chamber A4, and may also include other gears, such as a driving gear and a transitional gear (none of the above transmission gears are shown). A lead screw A7 that rotates coaxially with the driven gear is provided on the driven gear. The lead screw A7 passes through the base and extends from the boss A5. The silicone gasket A6 includes a body, a concave on one side of the body, and an extension on the other side of the body. The concave cooperates with the boss A5 of the base A1, and the extension cooperates with the end of the liquid storage chamber A2 to achieve liquid-tight sealing. This structure adopts a static sealing method, and its liquid-tight effect has serious defects. This is because on the one hand, this structure cannot achieve dynamic sealing, and on the other hand, due to the material of the silicone gasket A6 being prone to deformation, during use, the vibration generated by the motor will cause the silicone gasket A6 to generate an undesired deformation, thereby forming a channel for the overflow of the liquid medicine. Summary of the Invention

[0005] The object of the present invention is to provide a sealing assembly, an infusion device and an infusion system, so as to solve the problem of poor liquid-proof sealing effect of the infusion device in the prior art.

[0006] To solve the above technical problems, according to one aspect of the present invention, a sealing assembly is provided, which includes: a base, a rotating shaft and a first sealing member;

[0007] The base has a first accommodation cavity and a first through hole axially penetrating the first accommodation cavity;

[0008] The first sealing member is arranged in the first accommodation cavity and is configured to be relatively fixed with the first accommodation cavity. The first sealing member has a second through hole, and the second through hole is coaxially arranged with the first through hole. The rotating shaft rotatably passes through the first through hole and the second through hole. The second through hole has a first inner peripheral surface adjacent to the rotating shaft; the rotating shaft includes a smooth section, and the smooth section is in interference fit with the first inner peripheral surface, and the surface roughness Ra of the smooth section is not greater than 6.3 μm.

[0009] Optionally, the sealing assembly includes a second sealing member, and the second sealing member is arranged between the outer periphery of the first sealing member and the side wall of the first accommodation cavity. The first sealing member is hermetically connected to the side wall of the first accommodation cavity through the second sealing member and is at least circumferentially relatively fixed.

[0010] Optionally, in the sealing assembly, the second sealing member has a third through hole and a second outer peripheral surface, and the third through hole has a second inner peripheral surface; the first sealing member has a first outer peripheral surface, and the first sealing member is accommodated in the third through hole, and the first outer peripheral surface is in contact with the second inner peripheral surface; the second outer peripheral surface is in contact with the side wall of the first accommodation cavity.

[0011] Optionally, in the sealing assembly, the outer dimension of the second outer peripheral surface in the radial direction is greater than the inner dimension of the first accommodation cavity; and / or, the outer dimension of the first outer peripheral surface in the radial direction is greater than the inner dimension of the second inner peripheral surface.

[0012] Optionally, in the sealing assembly, the shape of the longitudinal section of the first outer peripheral surface includes a concave curve, and the shape of the second inner peripheral surface is at least adapted to the concave curve.

[0013] Optionally, in the sealing assembly, the range of the concave depth of the curve of the longitudinal section of the first outer peripheral surface is between 1 / 3 and 1 / 2 of the wall thickness of the second sealing member.

[0014] Optionally, in the sealing assembly, the Shore hardness of the second sealing member ranges from 40 degrees to 70 degrees, and the elastic modulus of the second sealing member ranges from 0.5 MPa to 20 MPa.

[0015] Optionally, in the sealing assembly, at least the first inner circumferential surface has a sliding friction coefficient relative to the rotating shaft in the range of 0.05 to 0.2 under dry friction conditions.

[0016] Optionally, in the sealing assembly, the surface roughness Ra of the first inner circumferential surface is less than or equal to 0.3 μm, and the surface roughness Rt of the first inner circumferential surface is less than or equal to 2.5 μm.

[0017] Optionally, the sealing assembly further includes a distal bearing coaxially arranged with the rotating shaft. The proximal end of the first seal has a first end face, and the distal end of the distal bearing has a second end face. The distal bearing is configured to limit the axial displacement of the first seal in the proximal direction by abutting the second end face against the first end face.

[0018] Optionally, the sealing assembly further includes a washer sleeved and fixed on the distal bearing, and the washer is received in the first receiving cavity.

[0019] Optionally, the sealing assembly includes a second seal disposed between the outer circumference of the first seal and the side wall of the first receiving cavity. The washer is configured to limit the axial displacement of the second seal in the proximal direction.

[0020] Optionally, in the sealing assembly, the first receiving cavity successively includes a first inner hole, a second inner hole, and a third inner hole from near to far. The first inner hole is used to receive the transmission assembly, the second inner hole is used to receive the washer; the third inner hole is used to receive the first seal and the second seal, and the second seal is at least circumferentially fixed in the third inner hole.

[0021] Optionally, in the sealing assembly, a boss is formed on the outside of the base corresponding to the third inner hole, and the boss is used to connect to the housing to form a static seal.

[0022] Optionally, in the sealing assembly, the first inner circumferential surface includes at least one circumferentially arranged annular protrusion, and the first inner circumferential surface contacts the smooth section through the annular protrusion.

[0023] Optionally, in the sealing assembly, the first seal includes a Gland packing or a skeleton seal ring.

[0024] To solve the above technical problems, according to another aspect of the present invention, an infusion device is further provided, which includes: the sealing assembly, the transmission assembly, the housing, the driving assembly, and the controller as described above;

[0025] The driving assembly is communicatively connected to the controller and is configured to provide power for the infusion device under the control of the controller; the transmission assembly is respectively coupled to the driving assembly and the rotating shaft of the sealing assembly and is configured to transmit the power of the driving assembly to drive the rotating shaft to rotate; the rotating shaft is used to drive a liquid reservoir to discharge liquid medicine; the sealing assembly, the transmission assembly, the driving assembly, and the controller are all disposed in the housing;

[0026] The housing has a second accommodation cavity for detachably accommodating the liquid reservoir; the base of the sealing assembly is sealingly connected to the proximal end of the second accommodation cavity, and the rotating shaft penetrates into the second accommodation cavity through the first through hole.

[0027] Optionally, the infusion device further includes a commutation assembly; the commutation assembly is coupled to the rotating shaft and is configured to convert the rotational motion output by the rotating shaft into an axial movement to drive the liquid reservoir to discharge liquid medicine.

[0028] Optionally, in the infusion device, the commutation assembly includes a screw and a nut, the screw is threadedly connected to the nut, and the commutation assembly is configured such that, under the drive of the rotation of the rotating shaft, one of the screw and the nut moves axially.

[0029] Optionally, in the infusion device, the screw is fixedly connected to the rotating shaft, the housing has an axially disposed chute, the nut has a convex tooth adapted to the chute, and the convex tooth is movably engaged in the chute;

[0030] Alternatively, the nut is fixedly connected to the rotating shaft, the housing has an axially disposed chute, the screw has a convex tooth adapted to the chute, and the convex tooth is movably engaged in the chute;

[0031] Or,

[0032] One of the screw and the rotating shaft has an inner hole, the other of the screw and the rotating shaft is axially movably inserted into the inner hole, and the inner hole is configured to enable the screw to rotate synchronously with the rotating shaft; the nut is configured to restrict circumferential rotation and axial movement.

[0033] Optionally, in the infusion device, the distal end of the base has a boss, the outer diameter of the boss is smaller than the inner diameter of the proximal end of the second accommodation cavity, the infusion device further includes a sheet-shaped elastic member, the thickness of the sheet-shaped elastic member is greater than half of the difference between the outer diameter of the boss and the inner diameter of the proximal end of the second accommodation cavity, the sheet-shaped elastic member covers the boss, and the boss is cooperated with the proximal end of the second accommodation cavity through the sheet-shaped elastic member.

[0034] Optionally, in the infusion device, the transmission assembly includes a transmission gear set rotatably disposed in the first accommodation cavity of the sealing assembly; the transmission gear set is respectively connected to the driving assembly and the rotating shaft in the sealing assembly, and is configured to transmit the power of the driving assembly to the steering assembly.

[0035] To solve the above technical problems, according to another aspect of the present invention, there is also provided an infusion system, which includes: the infusion device as described above and a liquid reservoir detachably disposed in the second accommodation cavity of the infusion device, the liquid reservoir being configured to contain a liquid medicine and discharge the liquid medicine under the drive of the infusion device.

[0036] To solve the above technical problems, according to still another aspect of the present invention, there is also provided an infusion system, which includes: the infusion device as described above and a liquid reservoir detachably disposed in the second accommodation cavity of the infusion device, the liquid reservoir being configured to contain a liquid medicine and discharge the liquid medicine under the drive of the infusion device; the liquid reservoir includes a steering assembly and a liquid reservoir body, the steering assembly includes a screw rod and a nut, the screw rod is threadedly connected to the nut, one of the screw rod and the rotating shaft has an inner hole, the other of the screw rod and the rotating shaft is axially movably inserted into the inner hole, and the inner hole is configured to enable the screw rod to rotate synchronously with the rotating shaft; the nut is fixedly connected to the liquid reservoir body, and the liquid reservoir body is configured to restrict circumferential rotation and axial movement.

[0037] In summary, in the sealing assembly, infusion device and infusion system provided by the present invention, the sealing assembly includes: a base, a rotating shaft and a first seal; the base has a first accommodation cavity and a first through hole axially penetrating the first accommodation cavity; the first seal is disposed in the first accommodation cavity and is configured to be relatively fixed to the first accommodation cavity, the first seal has a second through hole coaxially disposed with the first through hole, the rotating shaft rotatably passes through the first through hole and the second through hole, and the second through hole has a first inner peripheral surface adjacent to the rotating shaft; the rotating shaft includes a smooth section, the smooth section is in interference fit with the first inner peripheral surface, and the surface roughness Ra of the smooth section is not greater than 6.3 μm. With such a configuration, the first inner peripheral surface of the second through hole is in interference fit with the smooth section of the rotating shaft. By setting the surface roughness of the smooth section and the elastic modulus of the first inner peripheral surface, it is possible to achieve dynamic liquid prevention of the rotating shaft relative to the base through the first seal when the rotating shaft rotates. It can effectively prevent the formation of a liquid flow channel due to the deformation of the seal caused by vibration during use. In addition, due to the low surface roughness of the smooth section, although it is in interference fit with the first inner peripheral surface, the rotational friction is low and will not increase the power consumption of the driver. Description of the Drawings

[0038] Those of ordinary skill in the art will understand that the accompanying drawings are provided to better understand the present invention and do not limit the scope of the present invention in any way. Among them:

[0039] Figure 1 is a schematic diagram of an existing infusion system;

[0040] Figure 2 is a schematic diagram of a sealing assembly provided by a preferred embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of a first seal provided by a preferred embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of a second seal provided by a preferred embodiment of the present invention;

[0043] Figure 5 is a schematic diagram of an infusion system provided by a preferred embodiment of the present invention;

[0044] Figure 6 is a schematic diagram of an infusion system provided by another preferred embodiment of the present invention.

[0045] In the accompanying drawings:

[0046] 2 - housing; 3 - controller; 4 - driver; 5 - encoder; 6 - transmission assembly; 7 - reservoir; 8 - steering assembly; 9 - input button;

[0047] 10 - base; 100 - first accommodation cavity; 101 - first through hole; 11 - first seal; 111 - first inner peripheral surface; 112 - second through hole; 113 - first outer peripheral surface; 114 - first end face; 115 - annular protrusion; 116 - fourth end face; 12 - second seal; 121 - second outer peripheral surface; 122 - second inner peripheral surface; 123 - third through hole; 14 - washer; 17 - boss; 18 - sheet elastic member;

[0048] 20 - second accommodation cavity; 21 - chute; 22 - convex teeth; 41 - output shaft;

[0049] 61 - driven gear; 62 - intermediate gear; 63 - driving gear;

[0050] 70 - reservoir body; 71 - push rod; 72 - piston; 701 - liquid outlet;

[0051] 81 - rotating shaft; 811 - smooth section; 812 - distal bearing; 813 - second end face; 814 - screw; 82 - nut. Detailed implementation manners

[0052] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the accompanying drawings are in very simplified forms and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the objectives of the embodiments of the present invention. In addition, the structures shown in the accompanying drawings are often part of the actual structures. In particular, the accompanying drawings need to show different emphases and sometimes use different scales.

[0053] As used in this specification, the singular forms "a", "an", and "the" include plural objects, the term "or" is generally used in the sense of including "and / or", the term "proximal" is usually the end close to the operator, and the term "distal" is usually the end close to the patient, unless the context clearly indicates otherwise.

[0054] The present invention provides a sealing assembly, an infusion device, and an infusion system to solve the problem of poor liquid-tightness and anti-liquid effect of the existing infusion device. The sealing assembly includes: a base, a rotating shaft, and a first sealing member. In the sealing assembly, the base has a first receiving cavity and a first through hole axially penetrating the first receiving cavity; the first sealing member is disposed in the first receiving cavity and is configured to be relatively fixed to the first receiving cavity. The first sealing member has a second through hole, and the second through hole is coaxially disposed with the first through hole. The rotating shaft rotatably passes through the first through hole and the second through hole. The second through hole has a first inner peripheral surface adjacent to the rotating shaft; the rotating shaft includes a smooth section, and the smooth section is in interference fit with the first inner peripheral surface. The surface roughness Ra of the smooth section is not greater than 6.3 μm. With such a configuration, the first inner peripheral surface of the second through hole is in interference fit with the smooth section of the rotating shaft. Through the setting of the surface roughness of the smooth section and the elastic modulus of the first inner peripheral surface, it can be realized that when the rotating shaft rotates, dynamic liquid prevention is achieved through the first sealing member relative to the base. It can effectively prevent the overflowing liquid medicine from entering the first receiving cavity along the rotating shaft during use. In addition, due to the low surface roughness of the smooth section, although it is in interference fit with the first inner peripheral surface, the rotational friction is low and it will not increase the power consumption of the driver.

[0055] The following takes an infusion device for infusing insulin liquid medicine as an example and will be described in detail with reference to the accompanying drawings. It should be understood that the following infusion device for infusing insulin liquid medicine is only an application example of the sealing assembly provided by the present invention, rather than a limitation on the application of the sealing assembly. The sealing assembly provided by the present invention can also be applied to other types of infusion devices.

[0056] Please refer to Figures 2 to 6 , wherein, Figure 2 is a schematic diagram of a sealing assembly provided by a preferred embodiment of the present invention, Figure 3 is a schematic diagram of a first sealing member provided by a preferred embodiment of the present invention,Figure 4 It is a schematic diagram of the second seal provided by a preferred embodiment of the present invention. Figure 5 It is a schematic diagram of an infusion system provided by a preferred embodiment of the present invention. Figure 6 It is a schematic diagram of an infusion system provided by another preferred embodiment of the present invention.

[0057] As Figure 2 shown, a preferred embodiment of the present invention provides a sealing assembly for infusing insulin liquid medicine, which includes: a base 10, a rotating shaft 81, and a first seal 11. Among them, the base 10 has a first accommodation cavity 100 and a first through hole 101 axially penetrating the first accommodation cavity 100. Preferably, the sealing assembly further includes a boss 17 located on the opposite side of the first accommodation cavity 100. The boss 17 is used to cooperate with the second accommodation cavity 20 in the housing 2. The rotating shaft 81 is used to receive the power of the transmission assembly 6 and output it to the commutation assembly.

[0058] Further, the first seal 11 is disposed in the first accommodation cavity 100 and configured to be relatively fixed to the first accommodation cavity 100. The first seal 11 has a second through hole 112, and the second through hole 112 is coaxially arranged with the first through hole 101. The rotating shaft 81 rotatably passes through the first through hole 101 and the second through hole 112. The second through hole 112 has a first inner peripheral surface 111 adjacent to the rotating shaft 81. Preferably, at least the elastic modulus of the first inner peripheral surface 111 ranges between 200 MPa and 600 MPa. Preferably, the surface roughness Ra of the first inner peripheral surface 111 is less than or equal to 0.3 μm, and the surface roughness Rt of the first inner peripheral surface 111 is less than or equal to 2.5 μm. The surface roughness Rt refers to the distance between the profile peak line and the profile valley bottom line within the evaluation length. Preferably, at least under dry friction conditions, the sliding friction coefficient of the first inner peripheral surface 111 relative to the rotating shaft 81 ranges between 0.05 and 0.2. Preferably, at least under dry friction conditions, the width of the wear scar of the first inner peripheral surface 111 ranges between 2 mm and 8 mm. The rotating shaft 81 includes a smooth section 811, and the smooth section 811 is in interference fit with the first inner peripheral surface 111. The surface roughness Ra of the smooth section 811 is not greater than 6.3 μm, preferably not greater than 2.5 μm, more preferably not greater than 1.6 μm, and further preferably not greater than 0.3 μm (the test method for surface roughness can refer to the national standard GB / T 1031-2009). Preferably, the material of the rotating shaft 81 is stainless steel, more preferably austenitic stainless steel, such as 304 stainless steel or 316 stainless steel, etc. With such a configuration, through the mating relationship between the smooth section 811 and the first inner peripheral surface 111, preferably, there are also the settings of the surface roughness of the smooth section 811, the surface roughness and elastic modulus of the first inner peripheral surface 111, it can be realized that the rotating shaft 81 can achieve dynamic liquid prevention relative to the base 10 when rotating through the first seal 11, so as to effectively prevent the overflowing liquid medicine from entering the first accommodation cavity along the rotating shaft during use. In addition, due to the low surface roughness of the smooth section 811, although there is an interference fit with the first inner peripheral surface 111, the rotational friction force is low, and the rotation between the first seal 11 and the rotating shaft 81 will not increase the power consumption of the driver.

[0059] Preferably, the material of the first seal 11 is a carbon fiber reinforced polytetrafluoroethylene material (CF / PTFE composite material), or a bronze-polytetrafluoroethylene reinforced material (Br / PTFE composite material). In addition to the above advantages, these two materials also have the advantages of wear resistance, stable performance, and low friction coefficient. Further, the smaller the contact area between the first inner peripheral surface 111 and the smooth section 811, the better. A smaller contact area can generate a larger pressure, which is more conducive to axial dynamic sealing.

[0060] Preferably, as Figure 3As shown, the first inner peripheral surface 111 includes at least one circumferentially arranged annular protrusion 115, and the first inner peripheral surface 111 contacts the smooth section 811 through the annular protrusion 115. The first inner peripheral surface 111 includes at least one annular protrusion 115, and more preferably includes two annular protrusions 115 to prevent one of them from failing. However, too many annular protrusions 115 will affect the magnitude of the pressure. In this embodiment, there is no particular limitation on the cross-sectional shape of the annular protrusion 115, which can be triangular, trapezoidal, serrated, etc.

[0061] Please continue to refer to Figure 2 and Figure 3 , the sealing assembly further includes a distal bearing 812, and the distal bearing is used to support the rotation of the rotating shaft 81. Further, the distal end of the distal bearing 812 has a second end face 813. Correspondingly, the proximal end of the first seal 11 has a first end face 114. The distal bearing 812 is configured to abut against the first end face 114 through the second end face 813 to limit the axial displacement of the first seal 11 in the proximal direction. Optionally, one side of the distal end of the first seal 11 has a fourth end face 116, and the first receiving cavity 100 further has a third end face opposite to the fourth end face 116, and the third end face abuts against the fourth end face 116. With such a configuration, the axial displacement of the first seal 11 can be limited, and the first seal 11 can be prevented from jumping off during use. Further, the outer diameter dimension of the distal bearing 812 is adapted to the outer dimension of the first seal 11.

[0062] Please refer to Figure 4 , and in combination with Figure 2 and Figure 3, to achieve the static seal of the first accommodating cavity 100 of the sealing assembly, the sealing assembly preferably further includes a second seal 12. The second seal 12 is disposed between the outer periphery of the first seal 11 and the side wall of the first accommodating cavity 100, that is, the first seal 11 is hermetically connected to the side wall of the first accommodating cavity 100 through the second seal 12 and is at least circumferentially relatively fixed. Preferably, the second seal 12 has a third through hole 123 and a second outer peripheral surface 121. The third through hole 123 has a second inner peripheral surface 122. The first seal 11 has a first outer peripheral surface 113. The first seal 11 is received in the third through hole 123, and the first outer peripheral surface 113 is in contact with the second inner peripheral surface 122. The second outer peripheral surface 121 is in contact with the side wall of the first accommodating cavity 100. Preferably, the outer dimension of the second outer peripheral surface 121 in the radial direction is slightly larger than the inner dimension of the first accommodating cavity 100 in the radial direction. Preferably, the outer dimension of the first outer peripheral surface 113 in the radial direction is slightly larger than the inner dimension of the second inner peripheral surface 122 in the radial direction. Here, the radial dimension is the diameter for a circle, and for other shapes, it refers to the distance from the geometric center to the contour edge. For example, the second outer peripheral surface 121 is connected to the side wall of the first accommodating cavity 100 by an interference fit, and the first outer peripheral surface 113 is connected to the second inner peripheral surface 122 by an interference fit. Here, "slightly larger" means within 40% greater, further, "slightly larger" means greater than 30%, greater than 20%, greater than 10%, greater than 5%, greater than 2% or greater than 1% within.

[0063] Preferably, the shape of the longitudinal section of the first outer peripheral surface 113 includes a concave curve, and the shape of the second inner peripheral surface 122 is at least adapted to the shape of the concave curve of the first outer peripheral surface 113. With such a configuration, the static liquid-proof sealing effect between the first seal 11 and the second seal 12 can be improved. The concave curve described here is, for example, a parabolic shape, a wavy shape, or a serrated shape, etc. Thus, sufficient contact between the first seal 11 and the second seal 12 can be achieved. Further, the range of the concave depth of the curve of the longitudinal section of the first outer peripheral surface 113 is between 1 / 3 and 1 / 2 of the wall thickness of the second seal 12, so that the second seal 12 can be in full contact with the concave structure and can also be in contact with the part of the curve other than the concave structure to achieve a better static liquid-proof effect. Optionally, both the first seal 11 and the second seal 12 are circular rings, which is convenient for assembly. The configuration of the second seal 12 can also increase the friction coefficient between the first seal 11 and the base 10, ensuring that the first seal 11 can rotate relative to the rotating shaft 81, rather than the first seal 11 rotating together with the rotating shaft 81.

[0064] Preferably, the Shore hardness of the second seal 12 ranges from 40 to 70 degrees, and the elastic modulus of the second seal 12 ranges from 0.5 MPa to 20 MPa. The lower elastic modulus of the second seal 12 makes it easy to generate elastic deformation, which is conducive to achieving static liquid prevention. Preferably, the material of the second seal is fluororubber (FKM) or nitrile rubber (NBR). These two materials also have the advantages of good chemical resistance and are suitable for sealing liquid medicine.

[0065] In an alternative embodiment, the second seal 12 may not be provided, and the first seal 11 includes a Gleitring or a skeleton seal ring. There is no particular limitation on the specific model of the Gleitring or the skeleton seal ring in this embodiment, and those skilled in the art can select the specific model according to actual needs. For example, the working pressure of the Gleitring is 0 to 40 Mpa, and the rotational movement speed is less than or equal to 15 m / s.

[0066] Further, the sealing assembly further includes a washer 14. The washer 14 is sleeved and fixed on the distal bearing 812, and the washer 14 is received in the first receiving cavity 100. The washer 14 is used to prevent the second seal 12 from axially moving. Therefore, the outer diameter dimension of the washer 14 matches the first receiving cavity 100 and is larger than the outer diameter of the first seal 11. Preferably, the washer 14 is required to be not easily deformed, and the range of the elastic modulus is preferably between 0.8 GPa and 3 GPa. More preferably, the washer 14 is made of PC (polycarbonate) or PP (polypropylene) materials, and these materials also have advantages such as high chemical stability. In an exemplary embodiment, the transmission assembly 6 in the infusion device includes a driven gear 61 rotatably located in the first receiving cavity 100. The driven gear 61, the distal bearing 812 and the rotating shaft 81 are coaxially connected. The washer 14 is sleeved and fixed on the distal bearing 812 and is located between the second seal 12 and the driven gear 61. The washer 14 is configured to limit the axial displacement of the second seal 12 in the proximal direction (i.e., the direction close to the driven gear 61). Preferably, the first receiving cavity 100 has a stepped structure, that is, the first receiving cavity 100 sequentially includes a first inner hole, a second inner hole, and a third inner hole from near to far along the axial direction of the rotating shaft 81. Preferably, the inner diameters of the first inner hole, the second inner hole, and the third inner hole gradually decrease. The first inner hole is used to receive the transmission assembly 6, such as the driven gear 61, that is, the inner diameter of the first inner hole is adapted to the driven gear 61. Optionally, the remaining components in the transmission assembly 6, such as the driving gear 63, the intermediate gear 62, etc., are all arranged in the first inner hole of the first receiving cavity 100. The second inner hole is used to receive the washer 14, and the outer diameter of the washer 14 is slightly smaller than the inner diameter of the second inner hole. The third inner hole is used to receive the first seal 11 and the second seal 12, and the diameter of the second seal 12 is slightly larger than the diameter of the third inner hole. For example, the second seal 12 is in interference fit with the third inner hole. Preferably, a boss 17 is formed outside the base corresponding to the third inner hole to achieve the compactness of the structure of the sealing assembly.

[0067] Such as Figure 5 and Figure 6As shown, based on the above-mentioned sealing assembly, a preferred embodiment of the present invention further provides an infusion device for infusing insulin liquid medicine, which includes the above-mentioned sealing assembly, a transmission assembly 6, a housing 2, a driving assembly, and a controller 3. The driving assembly is communicatively connected to the controller 3 and is used to provide power for the infusion device under the control of the controller 3. The transmission assembly 6 is respectively coupled to the driving assembly and the rotating shaft 81 of the sealing assembly and is used to transmit the power of the driving assembly to drive the rotating shaft 81 to rotate. The rotating shaft 81 is used to drive the discharge of the liquid medicine stored in a liquid storage device 7. The housing 2 is used to accommodate the above-mentioned components, and the sealing assembly, the transmission assembly 6, the driving assembly, and the controller are all arranged in the housing 2.

[0068] Further, a second accommodation cavity 20 is arranged in the housing 2 for detachably accommodating the liquid storage device 7. That is, the shape and size of the second accommodation cavity 20 match those of the liquid storage device 7. More specifically, the housing 2 is detachably connected to a cover body at the distal end of the second accommodation cavity 20 (such as using a threaded cover) to facilitate the replacement of the liquid storage device 7 or the liquid medicine it contains. The base 10 is preferably hermetically connected to the proximal end of the housing 2, and the rotating shaft 81 passes through the first through hole 101 into the second accommodation cavity 20. Preferably, the boss 17 at the distal end of the base 10 and the proximal end of the second accommodation cavity 20 are made of a hard material (for example, a polymer material with a modulus of elasticity between 0.8 GPa and 3 GPa, more preferably PP or PC material), and the outer dimension of the boss 17 is slightly smaller than the inner dimension of the proximal end of the housing 2. A sheet-shaped elastic member 18, such as a latex pad, a silica gel pad, or a rubber pad, is covered on the boss 17. The thickness of the sheet-shaped elastic member 18 is slightly larger than half of the size of the gap between the boss 17 and the proximal end of the housing 2. That is, the outer diameter of the boss 17 is smaller than the inner diameter of the proximal end of the second accommodation cavity 20, and the thickness of the sheet-shaped elastic member 18 is larger than half of the difference between the outer diameter of the boss 17 and the inner diameter of the proximal end of the second accommodation cavity 20. In this way, the boss 17 covered with the sheet-shaped elastic member 18 cooperates with the proximal end of the second accommodation cavity 20 to achieve static liquid prevention. By selecting the hard material of the boss 17 and providing the sheet-shaped elastic member 18 between the boss 17 and the proximal end of the second accommodation cavity 20, on the one hand, it has a certain deformation so that the boss 17 and the second accommodation cavity 20 can be assembled through deformation, and static liquid prevention can be achieved. At the same time, it can effectively prevent the formation of a liquid flow channel due to excessive deformation of the silica gel gasket caused by vibration in the prior art during use.

[0069] In some embodiments, the infusion device further includes a commutation assembly 8; the commutation assembly 8 is coupled to the rotating shaft 81 and is configured to convert the rotational motion output by the rotating shaft 8 into an axial movement to drive the liquid storage device 7 to discharge the liquid medicine. Further, the commutation assembly 8 includes a screw 814 and a nut 82. Among them, the screw 814 is threadedly connected to the nut 82. The commutation assembly 8 is configured such that, driven by the rotation of the rotating shaft 81, one of the screw 814 and the nut 82 moves axially to realize the discharge of the insulin liquid medicine from the liquid storage device 7. For example, one of the screw 814 and the nut 82 is coupled to the rotating shaft 81 and is used to rotate under the drive of the rotating shaft 81; the other of the screw 814 and the nut 82 is restricted from circumferential rotation. Another example is that one of the screw 814 and the nut 82 is fixed, and the other can rotate circumferentially and move axially.

[0070] As Figure 5 shown, in a demonstration example, the screw 814 is fixedly connected to the rotating shaft 81. The nut 82 is configured to be restricted from circumferential rotation under the limitation of the housing 2. Thus, driven by the rotation of the rotating shaft 81, the nut 82 can only move axially along the screw 814. Specifically, the housing 2 is further provided with an axially arranged sliding groove 21 in the second accommodation cavity 20, and the length of the sliding groove 21 is adapted to the stroke of the nut 82. The nut 82 has a convex tooth 22 adapted to the sliding groove 21, and the convex tooth 22 is movably clamped in the sliding groove 21 to restrict the rotation of the nut 82. The axis of the sliding groove 21 is parallel to the axis of the screw 814. Thus, driven by the screw 814, the nut 82 can move linearly along the direction restricted by the sliding groove 21 of the housing 2. Those skilled in the art should understand that the commutation assembly 8 is not limited to the threaded connection structure of the screw and the nut, and a gear-rack structure or the like that can realize the conversion of the rotational motion output by the transmission assembly 6 into a translational motion can also be used.

[0071] Correspondingly, the liquid storage device 7 includes a liquid storage device body 70, a push rod 71 and a piston 72. The liquid storage device body 70 is a tubular hollow structure, one end ( Figure 5 the left end in the figure) is open, and the other end ( Figure 5 the right end in the figure) is provided with a liquid outlet 701. The liquid storage device body 70 is used to accommodate the insulin solution with a configured concentration. The piston 72 is movably arranged inside the liquid storage device body 70 and is hermetically and movably connected to the inner wall of the liquid storage device body 70. The push rod 71 is connected to or abuts against the piston 72 to push the piston 72 to move. Under the action of the push rod 71, the piston 72 moves from the open end of the liquid storage device body 70 towards the liquid outlet 701 end, and the liquid medicine in the liquid storage device body 70 can be discharged from the liquid outlet 701.

[0072] More specifically, the push rod 71 is a hollow tube, and its distal end is connected to the piston 72. The distal end of the screw rod 814 passes through the nut 82 and is received within the push rod 71. The proximal end of the push rod 71 contacts (such as abuts or is snap-connected to) the nut 82. In this way, when the screw rod 814 rotates and causes the nut 82 to move in the distal direction, the nut 82 will push the push rod 71 to move distally, and further push the piston 72 to move within the reservoir body 70. It can be understood that when the nut 82 and the push rod 71 are driven by abutting, the nut 82 can only drive the push rod 71 to move distally, and cannot cause the push rod 71 to move proximally. In actual use, this configuration is sufficient for discharging the liquid medicine in the reservoir body 70. When the nut 82 pushes the push rod 71 to reach the maximum stroke, the housing 2 can be opened, the reservoir body 70 can be taken out, and a new reservoir body 70 containing the liquid medicine can be replaced. On the other hand, the screw rod 814 can be driven to rotate in the reverse direction to return the nut 82 to the initial position, and a new reservoir body 70 can be re-placed into the second accommodation cavity 20 of the housing 2, and the push rod 71 can be pushed back by the reservoir body 70 to abut against the nut 82. In some other embodiments, the nut 82 and the push rod 71 can also be snap-connected, and the snap-connection method can also transmit the axial force, and the disassembly and assembly process is also very convenient, facilitating the replacement of the reservoir body 70. The present invention does not limit the connection method between the nut 82 and the push rod 71, and those skilled in the art can adopt other connection methods for the nut 82 and the push rod 71 according to the actual situation.

[0073] In some other embodiments, it is not limited that the nut 82 moves axially under the drive of the screw rod 814. Instead, the nut 82 can also rotate circumferentially under the drive of the rotating shaft 81. The screw rod 814 is restricted from circumferential rotation. For example, the housing 2 has a chute provided axially, and the screw rod 814 has convex teeth adapted to the chute (the convex teeth can be provided at both ends of the screw rod 814 to avoid restricting the stroke of the screw rod 814), and the convex teeth are movably engaged in the chute. With such a configuration, the screw rod 814 can move axially under the drive of the nut 82. Correspondingly, the push rod 71 and the screw rod 814 can be connected in a manner without axial displacement, such as abutting, snap-connecting, screw-threading connecting or fixedly connecting, etc. Preferably, when the push rod 71 and the screw rod 814 are detachably connected (such as abutting, snap-connecting or screw-threading connecting, etc.), after all the liquid medicine is infused, the screw rod 814 can be separated from the reservoir 7, facilitating the replacement of the reservoir 7.

[0074] In addition, as Figure 6As shown, in another alternative embodiment, the steering assembly 8 includes a screw 814 and a nut 82. Among them, the screw 814 is threadedly connected to the nut 82. The screw 814 has a through hole, and the distal end of the rotating shaft 81 is inserted into the through hole. The through hole of the screw 814 is configured to enable the screw 814 to rotate synchronously with the rotating shaft 81 in the circumferential direction and to be axially movable relative to each other. Specifically, the rotating shaft 81 is a prismatic structure, and the through hole of the screw 814 is correspondingly a polygonal cylindrical structure matching the prismatic structure, so that there is no relative rotation between the rotating shaft 81 and the screw 814 in the circumferential direction. Specifically, for example, the rotating shaft 81 is a triangular prismatic structure, and the through hole of the screw 814 is correspondingly a triangular cylindrical structure, that is, the cross-sectional shapes of the rotating shaft 81 and the through hole of the screw 814 in the plane perpendicular to the axis are correspondingly triangular; or, for example, the rotating shaft 81 is a quadrangular prismatic structure, and the through hole of the screw 814 is correspondingly a quadrilateral cylindrical structure, that is, the cross-sectional shapes of the rotating shaft 81 and the through hole of the screw 814 in the plane perpendicular to the axis are correspondingly quadrilateral. Or, the rotating shaft 81 can also be other polygonal prismatic structures, which will not be elaborated here. Of course, those skilled in the art can also set the rotating shaft 81 to have a through hole, and the screw 814 is inserted into the through hole in an axially movable manner, which can also achieve the effect of enabling the screw 814 to rotate synchronously with the rotating shaft 81. In addition, the rotating shaft 81 and the screw 814 can also be circumferentially fixed by means of clamping. For example, on the outer wall of the distal end of the rotating shaft 81, there are rotating shaft protrusions extending radially, and correspondingly on the inner wall of the through hole of the screw 814, there are grooves recessed radially. When the rotating shaft 81 is inserted into the through hole of the screw 814, the protrusions on the rotating shaft 81 are clamped to the grooves of the through hole. The nut 82 is configured to restrict circumferential rotation and axial movement. For example, the nut 82 is fixedly connected to the housing 2, and the nut 82 cannot rotate circumferentially and move axially. The liquid reservoir 7 includes a liquid reservoir body 70 and a piston 72. The liquid reservoir body 70 is a tubular hollow structure, one end of which is open and the other end is provided with a liquid outlet. The liquid reservoir body 70 is used to accommodate the insulin solution with a configured concentration. The piston 72 is movably arranged inside the liquid reservoir body 70 and is sealingly and movably connected to the inner wall of the liquid reservoir body 70. The screw 814 is rotationally connected to or abuts against the piston 72 to push the piston 72 to move. When the screw 814 rotates, due to the constraint of the nut 82, it moves axially, thereby pushing the piston 72 to move from the open end of the liquid reservoir body 70 towards the liquid outlet 701, and the liquid medicine in the liquid reservoir body 70 can be discharged from the liquid outlet 701.

[0075] In some other alternative embodiments, the infusion device does not include the steering assembly 8, while the reservoir 7 includes the steering assembly 8. For example, the nut 82 is fixedly connected to the reservoir 7, and the reservoir 7 is restricted from circumferential rotation and axial movement by the second receiving cavity 20, so that the nut 82 is indirectly fixed to the housing 2 through the reservoir 7 and the second receiving cavity 20. The reservoir 7 includes a steering assembly 8, a piston 72, and a reservoir body 70. The steering assembly 8 includes a screw 814 and a nut 82. The driving of the infusion device can refer to the previous embodiment. In particular, after the liquid medicine in the reservoir body is used up, the steering assembly 8 can be replaced together with the piston 72 and the reservoir body 70, avoiding problems such as poor infusion accuracy caused by wear of the screw 814, nut 82, piston 72, etc. after long-term use, and the reset operation is simple when the transmission unit is reset. The rotating shaft only needs to rotate less than one circle to achieve reset.

[0076] Furthermore, the transmission assembly 6 may include a transmission gear set. Preferably, the transmission gear set is rotatably disposed in the first receiving cavity 100 of the sealing assembly. The transmission gear set is respectively connected to the driving assembly and the rotating shaft 81 in the sealing assembly, and is used to transmit the power of the driving assembly to the steering assembly 8. Specifically, the transmission gear set includes a driving gear 61 as the input of the transmission assembly 6 and a driven gear 63 as the output of the transmission assembly 6. The driving gear 61 is coaxially connected to the output of the driving assembly, and the driven gear 63 is coaxially connected to the rotating shaft 81 in the sealing assembly. The driving gear 61 transmits the power received from the driving assembly to the driven gear 63 and reduces the rotation speed of the driven gear 63. Preferably, the transmission ratio of the transmission assembly 6 ranges from 3:1 to 7:1. The driving gear 61 can be directly meshed and connected to the driven gear 63, and the driving gear 61 can also be connected to the driven gear 63 through an intermediate gear 62 to achieve a better reduction ratio in a more compact space. There is no particular limitation in this embodiment on whether to add the intermediate gear 62 and the number of added intermediate gears 62. Those skilled in the art can configure according to actual needs. In addition, those skilled in the art should understand that the transmission mechanism 6 is not limited to the form of a transmission gear set, and can also adopt belt drive, chain drive, etc. as long as it can transmit the power of the driving assembly to the steering assembly 8 through the rotating shaft of the sealing assembly.

[0077] Further, the driving assembly includes a driver 4 and an encoder 5. Among them, the encoder 5 is used to obtain the output state of the driver 4 (such as rotation angle, number of turns). The encoder 5 is communicatively connected to the controller 3 to enable the controller 3 to obtain the output state of the driver 4. The driver 4 is communicatively connected to the controller 3 to enable the controller 3 to control the motion state of the driver 4 (such as on / off, steering, rotational speed, etc.). In this embodiment, there is no particular limitation on the driver 4. Considering portability, a chemical battery is generally used as the energy source for the infusion device, and the driver 4 is preferably a DC motor. The encoder 5 is preferably a rotary encoder, such as an incremental rotary encoder or an absolute rotary encoder, and is disposed on the output shaft 41 of the driver 4. The controller 3 calculates the number of turns of the driver 3 during each infusion process according to the preset input amount per time, drug concentration in the reservoir, and other control information, controls the activation of the driver 3 according to the infusion time, and controls the deactivation of the driver 3 according to the actual number of turns of the driver 3 obtained by the rotary encoder 5.

[0078] Further, an input / output interface communicatively connected to the controller 3, such as an input button 9 and a display screen, is further provided on the housing 2. Through the input button 9, the controller 3 can receive control signals input from the outside. A built-in clock (not shown in the figure) is also provided inside the controller 3, and the built-in clock is used to provide the actual date and time for the controller. The control signals input from the outside can be the infusion time, the input amount per time, and the drug concentration in the reservoir. The controller 3 can select a chip well-known to those of ordinary skill in the art that can implement its functions. In the embodiment of the present application, the controller 3 is preferably a single-chip microcomputer. It should be understood that the above embodiments take an infusion device for infusing insulin solution as an example, but the infusion device provided in this embodiment is not limited to only infusing insulin solution and can also infuse other solutions.

[0079] As Figure 5 and Figure 6 shown, based on the above sealing assembly, a preferred embodiment of the present invention further provides an infusion system for infusing insulin solution, which includes the above-mentioned infusion device and a reservoir 7. The reservoir 7 is detachably disposed in the second accommodation cavity 20 of the infusion device. The reservoir 7 is used to contain the solution and discharge the solution under the drive of the infusion device.

[0080] In summary, in the sealing assembly, infusion device and infusion system provided by the present invention, the sealing assembly includes: a base, a rotating shaft and a first seal. The base has a first accommodation cavity and a first through hole axially penetrating the first accommodation cavity; the first seal is disposed in the first accommodation cavity and configured to be relatively fixed to the first accommodation cavity. The first seal has a second through hole coaxially disposed with the first through hole. The rotating shaft rotatably passes through the first through hole and the second through hole. The second through hole has a first inner peripheral surface adjacent to the rotating shaft; the rotating shaft includes a smooth section, and the smooth section is in interference fit with the first inner peripheral surface. The surface roughness Ra of the smooth section is not greater than 6.3 μm. With such a configuration, the first inner peripheral surface of the second through hole is in interference fit with the smooth section of the rotating shaft. By setting the surface roughness of the smooth section and the elastic modulus of the first inner peripheral surface, it is possible to achieve dynamic liquid prevention of the rotating shaft relative to the base through the first seal when the rotating shaft rotates. It can effectively prevent the formation of a liquid flow channel due to the deformation of the seal caused by vibration during use. In addition, due to the low surface roughness of the smooth section, although it is in interference fit with the first inner peripheral surface, the rotational friction is low and it will not increase the power consumption of the driver.

[0081] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A sealing component, characterized in that, Comprising: a base, a rotating shaft, and a first seal; the base has a first receiving cavity and a first through hole axially penetrating the first receiving cavity; the first seal is disposed in the first receiving cavity and configured to be relatively fixed with respect to the first receiving cavity. The first seal has a second through hole coaxially disposed with the first through hole. The rotating shaft rotatably passes through the first through hole and the second through hole. The second through hole has a first inner peripheral surface adjacent to the rotating shaft. The rotating shaft includes a smooth section that is in interference fit with the first inner peripheral surface, and the surface roughness Ra of the smooth section is not greater than 6.3 μm; the seal assembly includes a second seal disposed between the outer periphery of the first seal and the side wall of the first receiving cavity. The first seal is hermetically connected to the side wall of the first receiving cavity through the second seal and is at least circumferentially relatively fixed. The second seal has a third through hole and a second outer peripheral surface. The third through hole has a second inner peripheral surface. The first seal has a first outer peripheral surface, and the first seal is received in the third through hole, and the first outer peripheral surface is in contact with the second inner peripheral surface. The second outer peripheral surface is in contact with the side wall of the first receiving cavity; the seal assembly further includes a distal bearing coaxially arranged with the rotating shaft. The proximal end of the first seal has a first end face, and the distal end of the distal bearing has a second end face. The distal bearing is configured to limit the axial displacement of the first seal in the proximal direction by abutting the second end face against the first end face. The seal assembly further includes a washer sleeved and fixed on the distal bearing, and the washer is received in the first receiving cavity.

2. The sealing assembly according to claim 1, characterized in that, the outer dimension of the second outer peripheral surface in the radial direction is greater than the inner dimension of the first receiving cavity; and / or, the outer dimension of the first outer peripheral surface in the radial direction is greater than the inner dimension of the second inner peripheral surface.

3. The sealing assembly according to claim 1, characterized in that, the shape of the longitudinal section of the first outer peripheral surface includes a concave curve, and the shape of the second inner peripheral surface is at least adapted to the concave curve.

4. The sealing assembly according to claim 3, wherein, the range of the concave depth of the curve of the longitudinal section of the first outer peripheral surface is between 1 / 3 and 1 / 2 of the wall thickness of the second seal.

5. The sealing assembly according to claim 1, characterized in that, the Shore hardness of the second seal ranges between 40 degrees and 70 degrees, and the elastic modulus of the second seal ranges between 0.5 MPa and 20 MPa.

6. The sealing assembly according to claim 1, characterized in that, at least the first inner peripheral surface has a sliding friction coefficient with respect to the rotating shaft in the range of 0.05 to 0.2 under dry friction conditions.

7. The sealing assembly according to claim 1 or 6, characterized in that, the surface roughness Ra of the first inner peripheral surface is less than or equal to 0.3 μm, and the surface roughness Rt of the first inner peripheral surface is less than or equal to 2.5 μm.

8. The sealing assembly according to claim 1, characterized in that, the seal assembly includes a second seal disposed between the outer periphery of the first seal and the side wall of the first receiving cavity, and the washer is configured to limit the axial displacement of the second seal in the proximal direction.

9. The sealing assembly according to claim 8, characterized in that, The first accommodation cavity sequentially includes a first inner hole, a second inner hole, and a third inner hole from near to far. The first inner hole is used to accommodate a transmission component, the second inner hole is used to accommodate the washer, and the third inner hole is used to accommodate the first seal and the second seal, and the second seal is at least circumferentially fixed within the third inner hole.

10. The sealing assembly according to claim 9, characterized in that, A boss is formed on the outside of the base corresponding to the third inner hole, and the boss is used to connect with the housing to form a static seal.

11. The sealing assembly according to claim 1, characterized in that, The first inner peripheral surface includes at least one circumferentially arranged annular protrusion, and the first inner peripheral surface contacts the smooth section through the annular protrusion.

12. The sealing assembly according to claim 1, wherein The first seal includes a Gleason ring or a skeleton seal ring.

13. An infusion device, characterized in that, Including: The sealing assembly according to any one of claims 1 to 12 further includes: a transmission component, a housing, a driving component, and a controller; The driving component is communicatively connected to the controller and is configured to provide power for the infusion device under the control of the controller; the transmission component is respectively coupled to the driving component and the rotating shaft of the sealing assembly and is configured to transmit the power of the driving component to drive the rotating shaft to rotate; the rotating shaft is used to drive a liquid reservoir to discharge liquid medicine; the sealing assembly, the transmission component, the driving component, and the controller are all disposed in the housing; The housing has a second accommodation cavity for detachably accommodating the liquid reservoir; the base of the sealing assembly is hermetically connected to the proximal end of the second accommodation cavity, and the rotating shaft penetrates into the second accommodation cavity from the first through hole.

14. The infusion device according to claim 13, characterized in that, The infusion device further includes a steering component; the steering component is coupled to the rotating shaft and is configured to convert the rotational motion output by the rotating shaft into an axial movement to drive the liquid reservoir to discharge liquid medicine.

15. The infusion device according to claim 14, characterized in that, The steering component includes a screw and a nut, and the screw is threadedly connected to the nut. The steering component is configured such that, under the drive of the rotation of the rotating shaft, one of the screw and the nut moves axially.

16. The infusion device according to claim 15, characterized in that, The screw is fixedly connected to the rotating shaft, the housing has an axially arranged sliding groove, and the nut has a convex tooth adapted to the sliding groove, and the convex tooth is movably clamped in the sliding groove; Alternatively, the nut is fixedly connected to the rotating shaft, the housing has an axially arranged sliding groove, and the screw has a convex tooth adapted to the sliding groove, and the convex tooth is movably clamped in the sliding groove; Or, One of the screw and the rotating shaft has an inner hole, and the other of the screw and the rotating shaft is axially movably inserted into the inner hole, and the inner hole is configured to enable the screw to rotate synchronously with the rotating shaft; the nut is configured to limit circumferential rotation and axial movement.

17. The infusion device according to claim 15, wherein, The distal end of the base has a boss, the outer diameter of the boss is smaller than the inner diameter of the proximal end of the second accommodation cavity. The infusion device further includes a sheet-shaped elastic member, the thickness of the sheet-shaped elastic member is greater than half of the difference between the outer diameter of the boss and the inner diameter of the proximal end of the second accommodation cavity, the sheet-shaped elastic member covers the boss, and the boss cooperates with the proximal end of the second accommodation cavity through the sheet-shaped elastic member.

18. The infusion device according to claim 14, characterized in that, The transmission assembly includes a transmission gear set rotatably disposed in a first accommodation cavity of the sealing assembly; the transmission gear set is respectively connected to a driving assembly and a rotating shaft in the sealing assembly, and is configured to transmit the power of the driving assembly to the steering assembly.

19. An infusion system, characterized in that, Comprising: An infusion device and a liquid reservoir according to any one of claims 13 to 18, wherein the liquid reservoir is detachably disposed in a second accommodation cavity of the infusion device, and the liquid reservoir is configured to contain a liquid medicine and discharge the liquid medicine under the drive of the infusion device.

20. An infusion system, characterized in that, Comprising: An infusion device and a liquid reservoir according to claim 13, wherein the liquid reservoir is detachably disposed in a second accommodation cavity of the infusion device, and the liquid reservoir is configured to contain a liquid medicine and discharge the liquid medicine under the drive of the infusion device; the liquid reservoir includes a steering assembly and a liquid reservoir body, the steering assembly includes a screw rod and a nut, the screw rod is in threaded connection with the nut, one of the screw rod and the rotating shaft has an inner hole, the other of the screw rod and the rotating shaft is axially movably inserted into the inner hole, and the inner hole is configured to enable the screw rod to rotate synchronously with the rotating shaft; the nut is fixedly connected to the liquid reservoir body, and the liquid reservoir body is configured to restrict circumferential rotation and axial movement.

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