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 long 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 body penetrates through the lock catch ring, the lock catch handle is locked in the lock catch ring through interference fit between the disc-shaped base of the handle body and the lock catch ring in the inner diameter direction of the short axis of the lock catch ring. The latch ring is configured to be folded so that a bent hose section between a hose first position in which the latch ring is located and a hose second position in which the latch handle is located is held in a folded state to prevent undesired liquid flow. 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. This limitation in the operation sequence actually 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 aforementioned hose folding operation is completed. This 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 existing in the prior art 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] an oblong locking ring formed on the outer surface of the first position of the hose body, and the long axis of the locking ring is in a direction radially outward from the center axis of the hose body, and the short axis is perpendicular to the long axis and the center axis;

[0012] A lock handle having a handle body and a handle connecting portion, the handle body comprising a disc-shaped base and a rod-shaped upper portion, the handle connecting portion extending radially outwardly to the disc-shaped base at a second position of the hose body and forming an annular step surface at the junction of the two, the rod-shaped upper portion continuing to extend radially outwardly from the disc-shaped base, wherein the diameter of the disc-shaped base is greater than the minor axis inner diameter of the lock ring and less than the major axis inner diameter of the lock ring, and the diameter of the rod-shaped upper portion is less than the minor axis inner diameter;

[0013] And wherein, when the handle body is passed through the lock ring, the lock handle is locked in the lock ring by the interference fit between the disc-shaped base and the lock ring in the direction of the minor axis inner diameter, such that the kinked hose section of the hose body between the first position and the second position is held in a folded state that allows the hose body to block the flow of liquid therein without external force, and allows the kinked hose section to be at least partially unfolded as the handle connecting portion and the lock ring are stretched in the direction of the major axis inner diameter when the hose body is subjected to an axial tension force, thereby allowing the liquid to flow freely in the hose body.

[0014] According to the first aspect, when the handle body is passed through the lock ring, the lock handle having the handle body achieves a snap connection with the lock ring via the annular step surface, such that the kinked hose section of the hose body is held in a determined folded state. The kinked hose section in the determined folded state blocks the flow path of the liquid in the hose body, and the aforementioned snap connection is almost impossible to be released or the lock handle to be pulled out of the lock ring by extruding and compressing the size of the handle body bottom only by applying a specific external force to a specific position of the handle body. And this means that after the operator passes the handle body through the lock ring to form the snap connection, unless the snap connection is intentionally released, there is no risk of accidentally opening the flow path of the liquid in the hose body by misoperation or accidental touch. Further, when the lock handle and the lock ring forming the aforementioned snap connection are subjected to a pulling force, the component of the pulling force in the direction of the major axis of the lock ring will tend to make the lock ring and its long circular hole become more elongated, which makes the disc-shaped base more firmly locked at the long axis distal end portion of the lock ring and difficult to be pulled out of it.

[0015] Thus, this design provides a highly reliable liquid-free flow device for the infusion of medical liquids.

[0016] At the same time, in the determined folded state, if the hose body is subjected to an axial tensile force, the bent hose section is at least partially unfolded as the handle connecting portion and the locking ring are stretched along the long axis inner diameter direction, at this time, the part of the bent hose section at least becomes a state of being stretched more straight or forming an arc-shaped curved part compared to the folded state, thereby allowing the liquid to flow freely in the hose body, and this stretching force will tend to make the locking ring and its long circular hole become more elongated, thereby making the aforementioned snap connection provide a more secure locking effect. It should be noted that when the force that makes the bent hose section at least partially unfold disappears, the aforementioned snap connection will naturally drive the bent hose section to return to the determined folded state again, thereby preventing the liquid from flowing freely in the hose again.

[0017] According to some embodiments, the height of the disc-shaped base is between 1 / 10 and 1 / 4 of the overall height of the locking handle, and the rod-shaped upper part is an elongated rod-shaped disc-shaped base with a diameter less than 1 / 2 of the height.

[0018] This design will make there be enough gap between the rod-shaped upper part of the handle and the long axis inner diameter of the locking ring, thereby making the operation of passing the handle body through the locking ring easier to operate.

[0019] According to some preferred embodiments, the ratio of the long axis inner diameter of the locking ring to the short axis inner diameter of the disc-shaped base rod-shaped upper part is in the range of 3:1 to 1.5:1.

[0020] According to some preferred embodiments, the difference between the diameter of the disc-shaped base and the short axis 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 tube wall thickness is in the range of 0.5mm to 1.5mm,

[0021] According to some embodiments, the ratio of the length of the bent hose section to the sum of the radial dimension of the handle connecting portion and the radial dimension of the locking ring is in the range of 1.5:1 to 5:1, wherein the radial dimension of the handle connecting portion is defined as the radial distance from the disc-shaped base 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 circular arc on the side away from the hose body to the central axis of the hose body.

[0022] It should be noted that "axial" and "radial" in this disclosure refer to the axial and radial of the hose body unless otherwise specified.

[0023] 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 and the radial dimension of the locking ring is in the range of 2:1 to 4:1.

[0024] According to some preferred embodiments, the major axis inner diameter of the locking ring is in the range of 2mm to 5mm, and the minor axis inner diameter is in the range of 0.8mm to 2.5mm.

[0025] 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.

[0026] 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 component for a medical liquid infusion device as described in the above first aspect;

[0027] 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.

[0028] According to a third aspect of the present disclosure, there is provided a medical liquid infusion device, characterized in that the medical liquid infusion device comprises a peristaltic pump device and a liquid communication assembly for a medical liquid infusion device as described in the above second aspect, wherein the peristaltic pump device comprises:

[0029] a fixing element configured to fix the pump tube interface and the hose body, so that the hose body is stretched so that the bent hose section is at least partially unfolded, thereby allowing the free flow of liquid in the hose body; and

[0030] a driving mechanism arranged to drive the liquid to flow in the hose body at a controlled flow rate.

[0031] On the basis of common general knowledge in the art, the above-mentioned preferred conditions can be combined arbitrarily, i.e. to obtain each preferred example of the present disclosure.

[0032] The positive progress effect of the present disclosure is that:

[0033] 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

[0034] 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.

[0035] Figure 2 for Figure 1 Front view of the flexible hose component.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100: Flexible hose components

[0043] 11: First end

[0044] 12: Second end

[0045] 13: Second hose section

[0046] 14: Bending the flexible hose section

[0047] 15: First hose section

[0048] 21: handle connecting portion

[0049] 221: disc-shaped base

[0050] 222: rod-shaped upper portion

[0051] 23: lock ring

[0052] 231: coupling region

[0053] 300: peristaltic pump device

[0054] 31: positioning column

[0055] 32: rotor pivot shaft

[0056] 400: pump tube interface

[0057] 41: first interface

[0058] 42: second interface

[0059] 51: liquid inflow passage

[0060] 52: liquid outflow passage DETAILED DESCRIPTION

[0061] The preferred embodiments of the present application will be further described in conjunction with the accompanying drawings, the following description is exemplary, and is not a limitation of the present application, any other similar cases also fall within the scope of the present application.

[0062] In the following detailed description, directional terms such as "left", "right", "up", "down", "front", "back", etc. are used with reference to the orientation of the description in the drawings. The components of the embodiments of the present application can be placed in various different directions, and the directional terms are used for the purpose of example and are not limiting.

[0063] Referring to Figures 1-5 As shown, the elastic hose component 100 for a medical liquid infusion device according to a preferred embodiment of the present disclosure is integrally formed as a single piece from an elastic material. The elastic hose component 100 includes a hose body and a lock mechanism formed and protruding from the outer surface of the hose body, the lock mechanism being composed of a lock handle and an oblong lock ring 23 separated by a certain distance along the axial direction of the hose body.

[0064] Wherein, referring to Figures 1-2As shown, the hose body has a first end 11 and a second end 12 opposite to each other, and has a circular cross section. The locking ring 23 is formed on the outer surface of the hose body at a first position, and the long axis of the locking ring is in a direction radially outward from the central axis of the hose body, and the short axis is perpendicular to the long axis and the central axis. Among them, the locking ring 23 and the hose body have a bonding area 231 (also referred to as an engagement surface), which optionally has a local reinforcement structure to avoid material damage or cracking due to the pulling force in the radial direction when the locking ring 23 is subjected to the action of the force in the radial direction. The locking handle has a handle body and a handle connecting part 21, the handle body includes a disc-shaped base 221 and a rod-shaped upper part 222, the handle connecting part 21 extends radially outward to the disc-shaped base 221 of the handle body at a second position of the hose body, and forms an annular stepped surface at the joint of the two, and the rod-shaped upper part continues to extend radially outward from the disc-shaped base, wherein the diameter of the disc-shaped base is greater than the short axis inner diameter of the locking ring 23 and less than the long axis inner diameter of the locking ring, and the diameter of the rod-shaped upper part is less than the short axis inner diameter.

[0065] Among them, when the handle body is passed through the locking ring 23, the locking handle is locked in the locking ring 23 by the interference fit between the disc-shaped base and the locking ring 23 in the direction of the short axis inner diameter, so that the bent hose section 14 of the hose body between the first position and the second position is kept in a folded state, which allows the hose body to prevent the liquid from flowing therein under the action of external force, and allows the bent hose section 14 to be at least partially unfolded as the handle connecting part 21 and the locking ring 23 are stretched in the direction of the long axis inner diameter under the condition that 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 is passed through the locking ring 23, the locking handle with the handle body 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 due to the size of the disc-shaped base of the handle body being larger than the minor axis inner diameter of the locking ring 23 and smaller than the major axis inner diameter of the locking ring, and the diameter of the rod-shaped upper part being smaller than the minor axis inner diameter, so that only a specific external force applied to a specific position of the handle body can possibly release the snap connection or make the locking handle come out of the locking ring 23 by extrusion compression of the size of the handle body bottom. And when the locking handle and the locking ring forming the aforementioned snap connection are subjected to a pulling force, the component of the pulling force along the direction of the major axis of the locking ring will tend to make the locking ring and its long circular hole become more elongated, which makes the disc-shaped base be locked more firmly in the long axis distal end part of the locking ring and makes the handle more difficult to come out of the locking ring. This means that after the operator passes the handle body through the locking ring 23 to form the snap connection, unless the snap connection is intentionally released, there is no risk of the liquid flow passage in the hose body being accidentally opened due to misoperation or accidental touch.

[0067] At the same time, in the certain folded state, if the hose body is subjected to an axial pulling force, the bent hose section 14 is at least partially unfolded as the handle connecting part 21 is stretched, at which time this part of the bent hose section 14 at least becomes a state of being stretched more straight or forming an arc-shaped curved part of the section having a folding angle in the folded state, 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 component 100 is that the operator can pass the handle body through the locking ring 23 to make the elastic hose component 100 enter 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, regardless of whether the hose component is connected with an interface or other member at both ends or whether the connected member has a flexible feature, so as to prevent the liquid from flowing freely as desired. This provides excellent operational flexibility and convenience for the user or operator.

[0069] Reference is made to Figures 1-5 As shown, the design of the elastic hose component 100 of the present application has another additional advantage that when the hose body is subjected to axial tension, both the handle connecting portion 21 and the locking ring 23 are stretched together in the direction of the long axis inner diameter of the locking ring 23, so that the two parts jointly share the stress bearing and the resulting tensile deformation, which is beneficial to the durability and service life of the elastic hose component 100 in long-term repeated use. Another advantage of the design of the elastic hose component 100 of the present application is that the combination of the long circular hole form of the locking ring and the locking handle with the disc-shaped base 221 and the rod-shaped upper part 222, relying on the size of the locking ring in the long axis direction being significantly larger than the disc-shaped base 221 or the additional gap, can greatly reduce the positioning requirements for the locking and locking operation of the two, easy to complete the operation, and provide more operation fault tolerance space.

[0070] Reference is made to Figures 1-2 As shown, in the example shown, 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 the first hose section 15 on one side of the bent hose section 14 is formed between the locking ring 23 and the first end 11, and the second hose section 13 on one side of the bent hose section 14 is formed 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 through the locking ring 23 towards the first end 11, thus providing relatively high operational convenience. However, it can also be understood that the positions of the locking ring 23 and the locking handle on the hose body can be interchanged.

[0071] According to some preferred embodiments, especially with reference to Figure 4 As shown, the height of the disc-shaped base accounts for between 1 / 10 and 1 / 4 of the overall height of the locking handle, and the rod-shaped upper part is a long and narrow rod with a diameter less than 1 / 2 of the height. The rod-shaped upper part is optionally shaped with a slight taper to guide the operation of the handle through the locking ring

[0072] This design will provide sufficient clearance between the rod-shaped upper part of the handle and the long axis inner diameter of the locking ring, making the operation of passing the handle body through the locking ring easier to operate.

[0073] According to some preferred embodiments, especially with reference to Figure 4 As shown, the ratio of the long axis inner diameter of the locking ring (E in Figure 3 ) and the short axis inner diameter of the locking ring (G in Figure 3 ) is in the range of 3:1 to 1.5:1

[0074] This design balances the strength of the latch formed by the locking mechanism—ensuring it is not easily dislodged from the locking ring 23—with the relatively elongated rod-shaped upper part 222 providing a contact portion or surface that is easier to grip with fingers, thus facilitating the operation of pulling the handle body through the locking ring 23. Even if the relative twisting of the locking ring 23 and the locking handle occurs during the snap-fit ​​engagement, it will not significantly affect the stretching of the handle connection 21, and the stepped surface at the end of the handle can fit against the end face of the locking ring during engagement, ensuring a defined stretching length.

[0075] According to some preferred embodiments, particularly referring to the appendix Figures 2-4 As shown, the length of the bent hose section 14 ( Figure 2 The radial dimension of the handle connection part 21 (B) in the figure. Figure 4 The radial dimension of the locking ring 23 (D) and the "D" in the middle. Figure 3 The ratio of the sum of the two ("F" in the original text) is in the range of 1.5:1 to 5:1, wherein the radial dimension of the handle connection 21 is defined as the radial distance from the disc-shaped base of the handle body 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 arc of the locking ring 23 on the side away from the hose body to the central axis of the hose body. Furthermore, preferably, the ratio of the length of the bent hose section 14 to the sum of the radial dimensions of the handle connection 21 and the locking ring 23 is in the range of 2:1 to 4:1.

[0076] Based on this, according to some further preferred embodiments, the difference between the diameter of the disc-shaped base and the inner diameter of the short axis of the locking ring 23 is in the range of 0.5 mm to 1.5 mm, the outer diameter of the hose body is in the range of 4 mm to 8 mm, and the wall thickness is in the range of 0.5 mm to 1.5 mm (the inner and outer diameters of the hose body are shown as follows). Figure 3 (The "J" and "H" in the text).

[0077] More preferably, the inner diameter of the major axis of the locking ring 23 is in the range of 2 mm to 5 mm, the inner diameter of the minor axis is in the range of 0.8 mm to 2.5 mm, and the length of the bent hose section 14 is in the range of 15 mm to 35 mm. Optionally, the handle connection portion 21 has a circular cross-section and its diameter ( Figure 2about 2mm, which is suitable to allow the handle connecting portion 21 and the locking ring 23 to be stretched together in the direction of the inner diameter of the long axis to at least partially unfold the bent hose section to allow the liquid to pass through, but at the same time to maintain sufficient strength or toughness of the handle connecting portion 21 against damage in long-term repeated use and stretching / restoration. Moreover, the elastic material is a high-elastic and tear-resistant silicone material, which has an elongation at break greater than 450% and a tear strength greater than 35 MPa. The tear strength defines the force per unit cross-sectional area that the material can withstand, and under the action of an external force that does not exceed the force and the elongation at break, the material can substantially restore its original shape with elastic deformation.

[0078] The above further preferred embodiment not only provides an elastic hose assembly 100 with improved service life, but also takes into account the following two aspects: on the one hand, the elastic hose assembly 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 section 14 to allow the liquid to flow freely in the hose body, only a certain axial tension is sufficient to elongate the handle connecting portion 21 and sufficiently unfold the bent hose section 14, without the need to apply a very large tension. Thus, the elastic hose assembly 100 reduces the risk of damaging a part of the elastic hose assembly 100, such as the handle connecting portion 21 or the handle body, in repeated use, while also improving ease of use.

[0079] Reference Figure 6 and 7 As shown in FIGS. 1-3, 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 connectors 400 and the elastic hose assembly 100 described above. The pump tube connectors 400 are made of a non-elastic material and can form two independent tubes, each having a first interface 41 of a truncated cone shape and a second interface 42 of a cylindrical shape, the outer diameter of the bottom section of the first interface 41 being greater 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.

[0080] Reference Figure 7As shown, some preferred embodiments of the present disclosure also provide a medical liquid infusion device, which is substantially similar in overall construction and basic working principle to the infusion device provided in the Chinese patent CN 220424332 U introduced in the background section above. The medical liquid infusion device of the present disclosure comprises a peristaltic pump device 300 and a liquid connection assembly comprising the pump tube interface 400 and the elastic hose component 100 described above. The peristaltic pump device 300 comprises three positioning posts 31 arranged in an inverted triangular shape in Figure 7 the middle as a fixing element and as a peristaltic pump motor of a drive mechanism, which has a motor rotor that can be rotated (e.g., clockwise) in a controlled manner about a rotor pivot axis 32 of the peristaltic pump motor, and the positioning posts 31 are fixedly arranged relative to the motor rotor and the rotor pivot axis 32. Here, the first end 11 and the second end 12 of the hose body are respectively sleeved and fixed to the first interface 41 of the two pipelines, and the second interface 42 is 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 posts 31 are configured to be able to fix the hose body, and the pump tube interface 400 is fixed by other fixing clamps or other fixing elements (not shown in Figure 7 ) so that the hose body is stretched so that the bent hose section 14 is at least partially unfolded, thereby allowing the liquid from the medical liquid source to flow freely in the hose body.

[0081] The drive 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 the position shown, the hose hung or sleeved on the two positioning posts 31 below 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.

[0082] Further referring to Figure 7 , in Figure 7 the state shown, the medical liquid infusion device can be in the middle of an infusion operation, and if the elastic hose component 100 is disengaged from the positioning posts 31 due to misoperation or touching by the operator or others, then the bent hose section 14 will quickly return to the folded state under the elastic force of the handle connecting portion 21, thereby blocking the liquid passage in the hose and temporarily stopping the infusion until the operator arranges the elastic hose component 100 in place again. This avoids the risk of accidental delivery of medical liquid to the patient in an uncontrolled manner or rate during the infusion operation.

[0083] 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 component to be respectively connected with connectors such as plastic connectors or hard connector tubes, or as shown in the figure, assembled together via the connector and the pump tube connector 400, and then the handle body is passed through the lock ring so that the two form a buckle. Figure 7 As shown in the figure, the two ends of the anti-free-flow elastic hose component are respectively connected with the connector and the pump tube connector 400, and then the handle body is passed through the lock ring so that the two form a 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 lock ring so that the two form a buckle in the state that the medical liquid infusion device is basically assembled and the hose is stretched, and it can also avoid the aforementioned accidental infusion risk.

[0084] In addition, such an elastic hose component 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.

[0085] 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; An oblong locking ring is formed on the outer surface of the hose body at a first position, and the major axis of the locking ring is radially outward from the central axis of the hose body, and the minor axis is perpendicular to the major axis and the central axis. A locking handle having a handle body and a handle connecting part, the handle body including a disc-shaped base and a rod-shaped upper part, the handle connecting part extending radially outward to the disc-shaped base at a second position of the hose body, and forming an annular stepped surface at the junction of the two, the rod-shaped upper part continuing to extend radially outward from the disc-shaped base, wherein the diameter of the disc-shaped base is larger than the minor axis inner diameter of the locking ring and smaller than the major axis inner diameter of the locking ring, and the diameter of the rod-shaped upper part is smaller than the minor axis inner diameter; Furthermore, when the handle body is passed through the locking ring, the locking handle is locked in the locking ring by the interference fit between the disc-shaped base and the locking ring in the direction of the short axis inner diameter. This keeps the bent hose section 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 therein without external force, and allows the bent hose section to be at least partially unfolded as the handle connection and the locking ring are stretched along the direction of the long axis inner diameter 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 height of the disc-shaped base is between 1 / 10 and 1 / 4 of the overall height of the latch handle, and the upper rod-shaped part is a narrow rod-shaped disc-shaped base with a diameter less than 1 / 2 of its height.

3. The flexible tubing component for a medical fluid infusion device as described in claim 2, characterized in that, The ratio of the inner diameter of the major axis to the inner diameter of the minor axis of the locking ring is in the range of 3:1 to 1.5:

1.

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 disc-shaped base and the inner diameter of the short axis 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 1.5:1 to 5:1, wherein the radial dimension of the handle connection is defined as the radial distance from the disc-shaped base 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 arc of the locking ring on the side away from the hose body 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 2:1 to 4:

1.

7. The flexible tubing component for a medical fluid infusion device as described in claim 6, characterized in that, The inner diameter of the long axis of the locking ring is in the range of 2mm to 5mm, and the inner diameter of the short axis is in the range of 0.8mm to 2.5mm.

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.

Images