Medical liquid infusion device and liquid communication assembly and elastic hose component used for medical liquid infusion device

Abstract

The utility model discloses medical liquid infusion equipment and a liquid communication assembly and an elastic hose component used for the medical liquid infusion equipment. Wherein the elastic hose part is integrally formed into a single piece by an elastic material and comprises a hose main body, a circular lock catch ring and a lock catch handle, the lock catch handle is provided with a handle main body and a handle connecting part, and an annular step surface is formed between the handle main body and the handle connecting part. When the handle main body penetrates through the lock catch ring, the lock catch handle is locked in the lock catch ring through the joint between the annular step surface and the lock catch ring, so that a bent hose section between a first hose position where the lock catch ring is located and a second hose position where the lock catch handle is located is kept in a folded state; and therefore, unexpected liquid flow is prevented. According to the utility model, the risk of accidental or unexpected liquid flow or liquid infusion in the medical liquid infusion equipment or pipeline can be reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to medical liquid infusion devices, such as medical liquid delivery devices for administering a medical liquid to a patient via an infusion line using an intravenous infusion pump or an enteral feeding pump. The present disclosure relates to a medical liquid infusion device and a liquid communication assembly and a flexible hose component for use therewith, wherein the flexible hose component enables to prevent an unintended or undesired liquid flow or liquid infusion. BACKGROUND

[0002] In clinical medicine, infusion devices are widely used in the context of intravenous infusion or enteral feeding, and in conventional applications, the infusion flow rate needs to be controlled at all times. Otherwise, in the event of an accident, the liquid or solution to be infused can flow freely into the patient's body without being controlled by the pump or other flow rate regulating device, which can be particularly dangerous.

[0003] In order to avoid or reduce the above-mentioned risks, some anti-free-flow devices (i.e. anti-free-flow devices) for infusing medical liquids have been provided, which are generally mechanisms or components manually operated by an operator (such as a doctor, a nurse) that can be operated to selectively stop and allow the flow of a medical liquid through a certain conduit.

[0004] However, the existing anti-free-flow devices as described above still have some drawbacks. These existing anti-free-flow devices generally need to be manually operated when switching them from an open position to a closed position or vice versa, which leads to the risk of misoperation or accidental touching in actual application, such as caused by the operator, the patient himself or a passer-by unintentionally touching the anti-free-flow device or even causing the components and the infusion line or pump controlled thereby to be separated, and thus the flow and delivery of the liquid or solution to be infused is no longer controlled.

[0005] Moreover, these existing anti-free-flow devices can also have a higher requirement for correct installation to the pump or infusion line, and once it fails to be correctly installed in place, there is a risk of allowing an unintended or undesired liquid flow or liquid infusion to occur without being noticed.

[0006] To make up for the above-mentioned defects of the prior art, the Chinese utility model patent CN 220424332U proposes a solution for preventing the accidental or unexpected free flow of liquid for medical liquid infusion equipment, but this solution still needs to fold the hose and completely wrap the shorter side of the hose into the engagement ring and use the stop protrusion to prevent the hose from coming out, which is still not convenient enough. At the same time, another deficiency of this solution is that in actual use, the shorter side of the hose must be completely wrapped into the engagement ring first, and then the connecting parts such as plastic interface parts or hard interface tubes are connected at both ends of the elastic hose part, which means that the assembly between the other parts of the medical liquid infusion pipeline and the anti-free-flow elastic hose part can only be carried out after the folding operation of the hose is completed, which has an adverse effect on the operation efficiency of at least some operators during use.

[0007] Therefore, it is urgent to provide a new solution for preventing the accidental or unexpected free flow of liquid for medical liquid infusion equipment to at least partially alleviate or solve the above-mentioned problems and defects of the existing solutions, such as the installation operation of the anti-free-flow hose is not convenient and efficient. SUMMARY

[0008] To at least partially alleviate or solve the above-mentioned defects of the existing anti-free-flow device for infusing medical liquid, the present disclosure proposes a medical liquid infusion equipment and a liquid communication assembly and an elastic hose part therefor.

[0009] According to a first aspect of the present disclosure, an elastic hose part for a medical liquid infusion equipment is provided, characterized in that the elastic hose part is integrally formed as a single piece from an elastic material and comprises:

[0010] a hose body having a first end and a second end opposite to each other and having a circular cross section;

[0011] a circular locking ring formed on the outer surface of the first position of the hose body;

[0012] a locking handle having a handle body and a handle connecting part, the handle connecting part extending radially outward to the circular bottom surface of the handle body at the second position of the hose body and forming an annular stepped surface at the junction thereof, wherein the diameter of the circular bottom surface is greater than the inner diameter of the locking ring;

[0013] And wherein, when the handle body is threaded through the locking ring, the locking handle is locked in the locking ring by the engagement between the annular step face and the locking ring, so that the bent hose section of the hose body between the first position and the second position is kept in a folded state which allows the hose body to block the flow of liquid therein without external force, and allows the bent hose section to be at least partially unfolded as the handle connection is stretched when the hose body is subjected to axial tension, thereby allowing the liquid to flow freely in the hose body.

[0014] According to the first aspect, when the handle body is threaded through the locking ring, the locking handle with the handle body achieves a snap connection between the annular step face and the locking ring, so that the bent hose section of the hose body is kept in a certain folded state. The bent hose section in the certain folded state blocks the flow path of the liquid in the hose body, and the snap connection is almost impossible to be released or the locking handle to be pulled out of the locking ring by extruding and compressing the size of the bottom of the handle body, because the circular bottom of the handle body is larger than the inner diameter of the locking ring. This means that after the operator threads the handle body through the locking ring to form the snap connection, there is no risk of accidentally opening the flow path of the liquid in the hose body due to misoperation or accidental touch, unless the snap connection is intentionally released. Therefore, this design provides a high-reliability liquid-free-flowing device for infusing medical liquid.

[0015] Meanwhile, in the certain folded state, if the hose body is subjected to axial tension, the bent hose section is at least partially unfolded as the handle connection is stretched, at which time the bent hose section at least becomes a state of being stretched straighter to a certain extent compared to the folded state or a state of forming an arc-shaped curved portion from the previously folded-angle portion, thereby allowing the liquid to flow freely in the hose body. It should be noted that when the force that causes the bent hose section to be at least partially unfolded disappears, the snap connection naturally drives the bent hose section to return to the certain folded state again, thereby preventing the liquid from flowing freely in the hose body again.

[0016] According to some embodiments, the handle body is in the shape of a truncated cone that gradually narrows from the bottom surface to the top surface, and the ratio of the height of the handle body to the diameter of the circular bottom surface is in the range of 2:1 to 5:1.

[0017] This design will make it easier for the operator to thread the handle body through the locking ring, and more in line with the general habits of the operator.

[0018] According to some preferred embodiments, the handle body has a handle bottom and a handle upper part, the taper of the handle bottom is greater than the taper of the handle upper part.

[0019] According to some preferred embodiments, the difference between the diameter of the circular bottom surface and the inner diameter of the locking ring is in the range of 0.5mm to 1.5mm, the outer diameter of the hose body is in the range of 4mm to 8mm, the tube wall thickness is in the range of 0.5mm to 1.5mm,

[0020] According to some embodiments, the ratio of the length of the bent hose section to the sum of the radial dimension of the handle connection part and the radial dimension of the locking ring is in the range of 2:1 to 8:1, wherein the radial dimension of the handle connection part is defined as the radial distance from the circular bottom surface of the handle body to the central axis of the hose body, and the radial dimension of the locking ring is defined as the radial distance from the center of the locking ring to the central axis of the hose body.

[0021] It should be noted that the "axial" and "radial" in the present disclosure refer to the axial and radial of the hose body unless otherwise specified.

[0022] According to some preferred embodiments, the ratio of the length of the bent hose section to the sum of the radial dimension of the handle connection part and the radial dimension of the locking ring is in the range of 3:1 to 5:1.

[0023] According to some preferred embodiments, the radial dimension of the handle connection part is greater than the radial dimension of the locking ring, and the radial dimension of the handle connection part is in the range of 3mm to 5.5mm

[0024] According to some preferred embodiments, the elastic material is a high-elastic and tear-resistant silicone material, the elongation at break of the silicone material is greater than 450% and the tear strength is greater than 35MPa, and the length of the bent hose section is in the range of 15mm to 35mm.

[0025] According to a second aspect of the present disclosure, there is provided a liquid communication assembly for a medical liquid infusion device, wherein the liquid communication assembly comprises a pump tube interface and an elastic hose part for a medical liquid infusion device as described in the above first aspect;

[0026] The pump tube interface is made of a non-elastic material and forms two independent pipelines, each having a first interface and a second interface, wherein the two first interfaces are used to respectively sleeve and fix the first end and the second end of the hose body, and the two second interfaces are configured to accommodate and connect the liquid output port and the liquid input port of the medical liquid infusion device.

[0027] According to a third aspect of this disclosure, a medical fluid infusion device is provided, characterized in that the medical fluid infusion device includes a peristaltic pump device and a fluid communication assembly for the medical fluid infusion device as described in the second aspect above, wherein the peristaltic pump device includes:

[0028] A fixing element configured to secure the pump connector and the hose body, thereby stretching the hose body to at least partially unfold the bent hose section, thus allowing free flow of liquid within the hose body; and

[0029] A drive mechanism is arranged to drive liquid to flow at a controlled rate within the hose body.

[0030] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present disclosure.

[0031] The positive and progressive effects of this disclosure are as follows:

[0032] The medical fluid infusion device and the fluid communication assembly and flexible hose component used therein, as disclosed herein, provide a highly reliable design to prevent free flow of fluid, which can minimize accidental or undesirable fluid flow or infusion in the medical fluid infusion device or tubing, while the installation and use of the flexible hose component are simple and convenient. Attached Figure Description

[0033] Figure 1 A perspective view of a flexible hose component for a medical fluid infusion device according to a preferred embodiment of the present disclosure is shown schematically in a non-use state.

[0034] Figure 2 for Figure 1 Front view of the flexible hose component.

[0035] Figure 3 The diagram schematically illustrates the view taken along the axial direction of the hose body. Figures 1-2 A view of the locking ring.

[0036] Figure 4 The diagram schematically illustrates the view taken along the axial direction of the hose body. Figures 1-2 The view of the latch handle.

[0037] Figure 5 A perspective view of a resilient hose component for a medical fluid infusion device according to a preferred embodiment of the present disclosure is schematically shown in a folded state, wherein the handle body is passed through a locking ring so that the resilient hose component is in a defined folded state.

[0038] Figure 6 This diagram schematically illustrates the connection of a flexible hose assembly to the tubing of a medical fluid infusion device via a pump connector.

[0039] Figure 7 An exemplary layout of a medical fluid infusion device is schematically shown, wherein, in Figures 1-5 The flexible hose component shown is arranged to be associated with the peristaltic pump device.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100: Flexible hose components

[0042] 11: First end

[0043] 12: Second end

[0044] 13: Second hose section

[0045] 14: Bending the flexible hose section

[0046] 15: First hose section

[0047] 21: Handle connection part

[0048] 22: Handle body

[0049] 221: Bottom of the handle

[0050] 222: Upper part of handle

[0051] 23: Locking ring

[0052] 231: Combining regions

[0053] 300: Peristaltic pump unit

[0054] 31: Positioning Post

[0055] 32: Rotor pivot shaft

[0056] 400: Pump pipe fitting

[0057] 41: First Interface

[0058] 42: Second Interface

[0059] 51: Liquid inflow channel

[0060] 52: Liquid outflow channel Detailed Implementation

[0061] The preferred embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The following description is exemplary and not intended to limit the present invention. Any other similar situations also fall within the protection scope of the present invention.

[0062] In the following detailed description, directional terms such as "left," "right," "up," "down," "front," and "back" are used with reference to the directions described in the accompanying drawings. Components of embodiments of this invention can be positioned in a variety of different orientations; the directional terms are for illustrative purposes and not restrictive.

[0063] refer to Figures 1-5 As shown, a preferred embodiment of the present disclosure provides an elastic hose component 100 for a medical fluid infusion device, wherein the elastic hose component 100 is integrally molded from an elastic material as a single piece. The elastic hose component 100 includes a hose body and a locking mechanism formed and protruding from the outer surface of the hose body. The locking mechanism consists of a locking handle spaced a certain distance apart along the axial direction of the hose body and a circular locking ring 23.

[0064] Among them, reference Figures 1-2 As shown, the hose body has a first end 11 and a second end 12 opposite to each other, and has a circular cross-section. A locking ring 23 is formed on the outer surface of the hose body at a first position. The locking ring 23 and the hose body have a mating area 231 (also referred to as a joint surface), which optionally has a locally reinforced structure to prevent material damage or tearing of the locking ring 23 when subjected to radial forces. The locking handle has a handle body 22 and a handle connecting portion 21. The handle connecting portion 21 extends radially outward at a second position on the hose body to the circular bottom surface of the handle body 22, forming an annular stepped surface at the joint, wherein the diameter of the circular bottom surface is larger than the inner diameter of the locking ring 23.

[0065] When the handle body 22 is passed through the locking ring 23, the locking handle is locked in the locking ring 23 by the engagement between the annular stepped surface and the locking ring 23, thereby keeping the bent hose section 14 of the hose body between the first position and the second position in a folded state. The folded state allows the hose body to prevent liquid from flowing in it without external force, and allows the bent hose section 14 to be at least partially unfolded as the handle connection 21 is stretched when the hose body is subjected to axial tension, thereby allowing the liquid to flow freely in the hose body.

[0066] It can be understood that when the handle body 22 is passed through the locking ring 23, the locking handle with the handle body 22 achieves a snap connection with the locking ring 23 via the annular stepped surface, so that the bent hose section 14 of the hose body is kept in a certain folded state. The bent hose section 14 in the certain folded state blocks the liquid flow passage in the hose body, and the aforementioned snap connection is almost impossible to be released or the locking handle is almost impossible to be pulled out of the locking ring 23 by extruding and compressing the size of the bottom of the handle body 22 due to the fact that the circular bottom surface of the handle body 22 is larger than the inner diameter of the locking ring 23, unless a certain external force is applied to a specific position of the handle body 22. This means that after the operator passes the handle body 22 through the locking ring 23 to form the snap connection, there is no risk of the liquid flow passage in the hose body being accidentally opened due to misoperation or accidental touch, unless the snap connection is intentionally released.

[0067] At the same time, in the certain folded state, if the hose body is subjected to an axial tensile force, the handle connecting portion 21 is stretched so that the bent hose section 14 is at least partially unfolded, at which time the part of the bent hose section 14 at least becomes a state of being stretched to a certain extent straighter than in the folded state or a state of forming an arc-shaped curved portion from the section having a folding angle before, thereby allowing the liquid to flow freely in the hose body. When the force causing the bent hose section 14 to be at least partially unfolded disappears, the aforementioned snap connection will naturally drive the bent hose section 14 to return to the certain folded state again, thereby preventing the liquid from flowing freely in the hose again.

[0068] It should also be understood that, with reference to Figure 1 、 2 , 5, 7, an additional advantage of the elastic hose assembly 100 is that, regardless of whether the hose assembly is connected with an interface or other component at both ends or whether the connected component has a flexible feature, the operator can put the elastic hose assembly 100 into the anti-free-flow working state, i.e., in the certain folded state or in a state of returning to the folded state under the action of the elastic force once the force causing the bent hose section 14 to be at least partially unfolded disappears, in any case, by pulling the handle body 22 through the locking ring 23, so as to prevent the liquid from flowing freely as desired. This provides excellent operational flexibility and convenience for the user or operator.

[0069] With reference to Figures 1-2As shown, in the illustrated example, the first position of the locking ring 23 is closer to the first end 11 than the second position of the locking handle, so that a first hose section 15 is formed on one side of the bent hose section 14 between the locking ring 23 and the first end 11, and a second hose section 13 is formed on the other side of the bent hose section 14 between the locking handle and the second end 12 (the farther end). This arrangement makes it relatively easier for the user to pull the locking handle to pass the handle body 22 through the locking ring 23 towards the first end 11, thus providing relatively high operational convenience. However, it is also understood that the locking ring 23 and the locking handle can be arranged in the reverse positions on the hose body.

[0070] According to some preferred embodiments, especially with reference to Figure 4 As shown, the handle body 22 is in the shape of a truncated cone tapering from the bottom to the top, and the ratio of the height of the handle body 22 to the diameter of the circular bottom is in the range of 2:1 to 5:1.

[0071] This design makes it easier to perform the operation of passing the handle body 22 through the locking ring 23, and is more in line with the general habits of the operator.

[0072] According to some preferred embodiments, especially with reference to Figure 4 As shown, the handle body 22 has a handle bottom 221 and a handle top 222, and the taper of the handle bottom 221 is greater than that of the handle top 222.

[0073] This design can take into account the firmness of the clasp formed by the locking mechanism, i.e. the degree of difficulty in disengaging from the locking ring 23, on the one hand, and the relatively narrow handle top 222 can provide a contact portion or surface that is easier to grip and pull with the fingers, thus facilitating the operation of pulling the handle body 22 through the locking ring 23. Even if the clasp-like engagement between the locking ring 23 and the locking handle causes relative twisting of the two, it will not have any significant effect on the degree of stretching of the handle connecting portion 21, and the stepped surface of the handle end can be in contact with the end surface of the locking ring when engaged, ensuring a certain length of stretching.

[0074] According to some preferred embodiments, especially with reference to the accompanying Figures 2-4 As shown, the length (B) of the bent hose section 14 is greater than the radial dimension (C) of the handle connecting portion 21 and the radial dimension (D) of the locking ring 23. Figure 2 Figure 4 As shown, the length (B) of the bent hose section 14 is greater than the radial dimension (C) of the handle connecting portion 21 and the radial dimension (D) of the locking ring 23. Figure 3 ​the radial dimension of the handle connection portion 21 is defined as the radial distance from the circular base of the handle body 22 to the central axis of the hose body, and the radial dimension of the locking ring 23 is defined as the radial distance from the center of the locking ring 23 to the central axis of the hose body. And further preferably, the ratio of the length of the bent hose portion 14 to the sum of the radial dimension of the handle connection portion 21 and the radial dimension of the locking ring 23 is in the range of 3:1 to 5:1.

[0075] On this basis, according to some further preferred embodiments, the diameter of the circular base and the inner diameter of the locking ring 23 (E in FIG. 1) are in the range of 0.5mm to 1.5mm, the outer diameter of the hose body is in the range of 4mm to 8mm, and the wall thickness of the hose body is in the range of 0.5mm to 1.5mm (the inner and outer diameters of the hose body are shown in FIG. 1 as D and F respectively). Figure 3 Figure 3

[0076] More preferably, the radial dimension of the handle connection portion 21 is greater than the radial dimension of the locking ring 23, and the radial dimension of the handle connection portion 21 is in the range of 3mm to 5.5mm, and the length of the bent hose portion 14 is in the range of 15mm to 35mm. Optionally, the handle connection portion 21 has a circular cross-section and its diameter (D in FIG. 1) is about 2mm. Figure 2

[0077] The above further preferred embodiments not only provide an elastic hose component 100 with improved service life, but also take into account the following two aspects: on the one hand, the elastic hose component 100 in the folded state reliably completely prevents the liquid from flowing in the hose body (i.e., reliable self-flow prevention property), and on the other hand, when it is desired to at least partially unfold the bent hose portion 14 so as to allow the liquid to flow freely in the hose body, only a certain axial tension is sufficient to elongate the handle connection portion 21 and sufficiently unfold the bent hose portion 14, without the need to exert a very large tension. Thus, the elastic hose component 100 reduces the risk of damaging a certain part of the elastic hose component 100, such as the handle connection portion 21 or the handle body 22, in repeated use, while also improving ease of use.

[0078] Reference is made to Figure 6 and 7 ​​​As shown, some preferred embodiments of the present disclosure also provide a liquid communication assembly for a medical liquid infusion device, which includes a pair of pump tube interface pieces 400 and the elastic hose component 100 described above. The pump tube interface pieces 400 are made of non-elastic material and can form two independent tubes, each having a first interface 41 of truncated cone shape and a second interface 42 of cylindrical shape, the outer diameter of the bottom section of the first interface 41 being larger than the inner diameter of the hose body, so that the first end 11 and the second end 12 of the hose body are respectively sleeved and fixed on the first interfaces 41 of the two tubes, and the second interfaces 42 are configured to accommodate and connect the liquid output port and the liquid input port of the medical liquid infusion device.

[0079] Reference Figure 7 As shown, some preferred embodiments of the present disclosure also provide a medical liquid infusion device, which has the same overall structure and basic working principle as the infusion device provided in Chinese Patent CN 220424332 U introduced in the background section above. The medical liquid infusion device of the present disclosure includes a peristaltic pump device 300 and a liquid connection assembly including the pump tube interface pieces 400 and the elastic hose component 100 described above. The peristaltic pump device 300 includes three positioning columns 31 arranged in an inverted triangle in Figure 7 The first end 11 and the second end 12 of the hose body are respectively sleeved and fixed on the first interfaces 41 of the two tubes, and the second interfaces 42 are connected to the liquid inflow channel 51 and the liquid outflow channel 52 of the medical liquid infusion device. For example, the liquid inflow channel 51 can be a hose connected to a medical liquid source, and the liquid outflow channel 52 is a hose connected to a syringe. The positioning columns 31 are configured to fix the hose body, and the pump tube interface pieces 400 are fixed by other fixing clamps or other fixing elements (not shown in Figure 7 The first end 11 and the second end 12 of the hose body are respectively sleeved and fixed on the first interfaces 41 of the two tubes, and the second interfaces 42 are connected to the liquid inflow channel 51 and the liquid outflow channel 52 of the medical liquid infusion device. For example, the liquid inflow channel 51 can be a hose connected to a medical liquid source, and the liquid outflow channel 52 is a hose connected to a syringe. The positioning columns 31 are configured to fix the hose body, and the pump tube interface pieces 400 are fixed by other fixing clamps or other fixing elements (not shown in

[0080] The driving mechanism is arranged in association with the second hose section 13, so that the liquid from the medical liquid source flows in the hose body at a controlled flow rate. Based on the known working principle of peristaltic pumps, it can be understood that in Figure 7 In the position shown, the hose hung or sleeved on the two lower positioning columns 31 is stretched while being fixed, so that the bent hose section is also stretched to an at least partially unfolded state to allow the liquid to flow freely therein.

[0081] Further reference Figure 7 , in Figure 7 In the state shown, the medical liquid infusion device can be in the middle of an infusion operation, and if the elastic hose part 100 is disengaged from the positioning post 31 due to a mistake or touch by an operator or other person, the bent hose section 14 will then quickly return to the folded state under the elastic force of the handle connecting part 21, thereby blocking the liquid passage in the hose and temporarily stopping the infusion until the operator again arranges the elastic hose part 100 in place. This avoids the risk of an accident during the infusion operation, which would cause the medical liquid to be delivered to the patient in an uncontrolled manner or rate.

[0082] And, it can also be understood that the solution proposed in the Chinese utility model patent CN 220424332 U, a significant advantage of the medical liquid infusion device provided by the preferred embodiment of the present disclosure is that it can allow the two ends of the anti-free-flow elastic hose part to be connected with connecting parts such as plastic interface parts or hard interface tubes, or assembled together via the interface part and the pump tube interface part 400 as shown, and then the handle body is passed through the locking ring so that the two form a snap buckle. In other words, the present disclosure provides an anti-free-flow solution without restrictions on the operation sequence, and if necessary, the handle body can be passed through the locking ring to form a snap buckle in the state where the medical liquid infusion device is basically assembled and the hose is stretched, and it can also avoid the aforementioned risk of accidental infusion. Figure 7

[0083] In addition, such an elastic hose part according to the above preferred embodiment of the present disclosure also has the advantages of relatively low cost and easy use, and is particularly suitable for medical infusion devices such as intravenous infusion devices, pump tube devices for enteral nutrition delivery, etc.

[0084] Although the specific embodiments of the present utility model are described above, those skilled in the art should understand that these are only illustrative, and the protection scope of the present utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present utility model, and such changes and modifications all fall within the protection scope of the present utility model.​

Claims

1. A flexible hose component for a medical fluid infusion device, characterized in that, The flexible hose component is integrally molded from an elastic material into a single piece and includes: The hose body has a first end and a second end opposite to each other, and has a circular cross-section; A circular locking ring is formed on the outer surface of the hose body at a first position; A locking handle having a handle body and a handle connecting part, wherein the handle connecting part extends radially outward at a second position on the hose body to the circular bottom surface of the handle body, and forms an annular stepped surface at the junction of the two, wherein the diameter of the circular bottom surface is larger than the inner diameter of the locking ring; Furthermore, when the handle body is passed through the locking ring, the locking handle is locked in the locking ring through the engagement between the annular stepped surface and the locking ring, thereby keeping the bent hose section of the hose body in a folded state between the first position and the second position. This folded state allows the hose body to prevent liquid from flowing therein without external force, and allows the bent hose section to be at least partially unfolded as the handle connection is stretched when the hose body is subjected to axial tension, thereby allowing liquid to flow freely in the hose body.

2. The flexible tubing component for a medical fluid infusion device as described in claim 1, characterized in that, The handle body is shaped like a truncated cone, gradually narrowing from the bottom to the top, and the ratio of the height of the handle body to the diameter of the circular bottom surface is in the range of 2:1 to 5:

1.

3. The flexible tubing component for a medical fluid infusion device as described in claim 2, characterized in that, The handle body has a handle bottom and a handle top, and the taper of the handle bottom is greater than the taper of the handle top.

4. The flexible tubing component for a medical fluid infusion device as described in claim 3, characterized in that, The difference between the diameter of the circular bottom surface and the inner diameter of the locking ring is in the range of 0.5mm to 1.5mm, the outer diameter of the hose body is in the range of 4mm to 8mm, and the wall thickness is in the range of 0.5mm to 1.5mm.

5. The flexible tubing component for a medical fluid infusion device as described in any one of claims 1-4, characterized in that, The ratio of the length of the bent hose section to the sum of the radial dimensions of the handle connection and the locking ring is in the range of 2:1 to 8:1, wherein the radial dimension of the handle connection is defined as the radial distance from the circular bottom surface of the handle body to the central axis of the hose body, and the radial dimension of the locking ring is defined as the radial distance from the center of the locking ring to the central axis of the hose body.

6. The flexible tubing component for a medical fluid infusion device as described in claim 5, characterized in that, The ratio of the length of the bent hose section to the sum of the radial dimensions of the handle connection and the locking ring is in the range of 3:1 to 5:

1.

7. The flexible tubing component for a medical fluid infusion device as described in claim 6, characterized in that, The radial dimension of the handle connector is greater than the radial dimension of the locking ring, and the radial dimension of the handle connector is in the range of 3mm to 5.5mm.

8. The flexible tubing component for a medical fluid infusion device as described in claim 7, characterized in that, The elastic material is a highly elastic and tear-resistant silicone material, the elongation at break of the silicone material is greater than 450% and the tear strength is greater than 35 MPa, and the length of the bent hose section is in the range of 15 mm to 35 mm.

9. A liquid communication component for a medical fluid infusion device, characterized in that, The liquid communication assembly includes a pump pipe interface and a flexible hose component for a medical liquid infusion device according to any one of claims 1-8; The pump tube interface is made of a non-elastic material and forms two independent tubes. Each tube has a first interface and a second interface. The two first interfaces are used to respectively fit and fix the first end and the second end of the hose body. The two second interfaces are configured to accommodate and connect the liquid output port and the liquid input port of the medical liquid infusion device.

10. A medical fluid infusion device, characterized in that, The medical fluid infusion device includes a peristaltic pump and a fluid communication assembly for a medical fluid infusion device according to claim 9, wherein the peristaltic pump includes: A fixing element configured to secure the pump connector and the hose body, thereby stretching the hose body to at least partially unfold the bent hose section, thus allowing free flow of liquid within the hose body; and A drive mechanism is arranged to drive liquid to flow at a controlled rate within the hose body.

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