Medical pressure measuring device and fluid perfusion system
By introducing a combination of expansion and limiting elements into the medical pressure measuring device, the problem of diaphragm damage has been solved, ensuring the safety and sealing of high-pressure measurement, extending the device's lifespan, and reducing manufacturing costs.
Patent Information
- Application Number
- CN202520291125.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2035-02-24
AI Technical Summary
The thin-film material in existing medical pressure measuring devices is prone to breakage due to insufficient mechanical strength, and its exposed installation is easily damaged, causing the device to fail when measuring high pressure.
The design combines an expansion element and a limiting element. The expansion element is connected to the fluid channel, and the limiting element restricts the expansion amount. The pressure is transmitted to the pressure measuring element through the moving part, avoiding direct contact between the expansion element and the sensing element. The gap is sealed by the clamping part.
It improves the service life and safety of the device, expands its application range, reduces manufacturing costs, and enhances sealing performance.
Smart Images
Figure CN223565149U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of pressure measurement, in particular to a medical pressure measurement device and a fluid infusion system. BACKGROUND
[0002] In the medical field, when a thin film is used to transfer pressure in a fluid pressure measurement device, the thin film material may not be able to withstand excessively high or sudden pressure due to insufficient mechanical strength, and the thin film is prone to rupture due to excessive expansion under unconstrained conditions. In addition, in some products, the thin film is often arranged in an exposed manner, which is prone to damage under external force. Therefore, how to solve the problem of thin film damage in the medical field is an urgent problem to be solved. CONTENT OF THE UTILITY MODEL
[0003] In order to overcome at least one of the many problems in the related art, the first aspect of the present disclosure provides a medical pressure measurement device. Wherein the medical pressure measurement device comprises:
[0004] a pipeline, a fluid channel is arranged in the pipeline;
[0005] an expansion element, the expansion element is arranged on the outer wall of the pipeline and at least partially communicates with the fluid channel to expand or contract following the change of pressure in the fluid channel;
[0006] a pressure measurement element, located on the side of the expansion element away from the axis of the pipeline, the pressure measurement element is used to measure the pressure transferred by the expansion element;
[0007] a limiting element, at least partially located between the expansion element and the pressure measurement element, the limiting element deforms following the change of pressure in the fluid channel to transfer the pressure in the fluid channel to the pressure measurement element, and is used to limit the expansion amount of the expansion element.
[0008] In some optional embodiments, at least one through hole is arranged on the pipe wall of the pipeline, one end of the through hole along the axis thereof communicates with the fluid channel, and the other end abuts against at least part of the expansion element.
[0009] In some optional embodiments, the expansion element is sleeved on the outer wall of the pipeline and is in sealed connection with the outer wall.
[0010] In some optional embodiments, the limiting element comprises a first clamping portion and a moving portion, the moving portion can be limitedly moved relative to the first clamping portion;
[0011] the moving portion is connected with the expansion element, and the moving portion moves following the expansion or contraction of the expansion element.
[0012] Optionally, the first clamping part comprises a through hole, and the moving part is in contact with or separated from the pressure measuring element through the through hole.
[0013] When the expansion element expands, the moving part moves along the through hole towards the pressure measuring element; or when the expansion element contracts, the moving part moves along the through hole away from the pressure measuring element.
[0014] Optionally, the maximum stroke of the moving part is greater than the maximum distance between the pressure measuring element and the moving part.
[0015] Optionally, at least part of the profile of the moving part at the connection with the expansion element is adapted to the profile of the outer wall of the pipeline.
[0016] Optionally, the second clamping part is further provided, which is located on the two sides of the pipeline with the first clamping part, and the second clamping part cooperates with the first clamping part to clamp the pipeline and the expansion element, so as to avoid leakage of fluid from the connection between the pipeline and the expansion element.
[0017] Optionally, a connecting element is further provided, which is connected with the limiting element, and the connecting element is used to fix the limiting element at a target position.
[0018] The second aspect of the present disclosure provides a fluid infusion system, which comprises a fluid infusion pipeline and the medical pressure measuring device of any one of the first aspect, wherein the fluid infusion pipeline is in fluid communication with the medical pressure measuring device.
[0019] The technical solution of the present disclosure has the following advantages or beneficial effects:
[0020] (1) In some embodiments of the present disclosure, a limiting element is provided, which limits the expansion amount of the expansion element, so as to avoid excessive expansion of the expansion element, which may cause significant increase of internal stress of the expansion element, and exceed the tensile strength of the expansion element, resulting in tearing or damage of the expansion element, etc. The service life and safety of the medical pressure measuring device are effectively improved. The problem that the film in the prior art is easily damaged when measuring large pressure is solved, and the application range of the medical pressure measuring device is improved.
[0021] (2) The limiting element in the present disclosure comprises a first clamping part and a moving part, the moving part can be limitedly moved relative to the first clamping part, so that the expansion element is covered and protected by the moving part, the pressure transmitted by the expansion element is transmitted to the sensing element through the moving element, thereby avoiding direct contact between the expansion element and the external sensing element, and improving the use safety.
[0022] (3) The present disclosure sets the first clamping part and the second clamping part to clamp the pipeline and the expansion element, and then seal the gap between the pipeline and the expansion element. This setting method not only can reduce the assembly difficulty, but also avoids the use of additional sealing materials or sealing process, effectively reduces the manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS
[0023] The accompanying drawings are used to better understand the present disclosure, and do not constitute undue limitations on the present disclosure. Among them:
[0024] Figure 1 is an exploded structural schematic diagram of a medical pressure measuring device according to an embodiment of the present disclosure;
[0025] Figure 2 is a top view schematic diagram of a medical pressure measuring device according to an embodiment of the present disclosure;
[0026] Figure 3 is Figure 2 is a cross-sectional schematic diagram of the medical pressure measuring device shown at D-D;
[0027] Figure 4 is Figure 2 is a cross-sectional schematic diagram of the medical pressure measuring device shown at E-E. DETAILED DESCRIPTION
[0028] The exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings, which include various details of the embodiments of the present disclosure to help understanding, and should be considered as merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Also, for the sake of clarity and conciseness, the description below omits the description of well-known functions and structures.
[0029] The terms used in the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein means and includes any or all possible combinations of one or more associated listed items.
[0030] It should be understood that, although the terms first, second, third, etc. can be used herein to describe various information, the information should not be limited to these terms. These terms are only used to differentiate one piece of information from another piece of information. For example, without departing from the scope of the present application, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information. Depending on the context, the word "if' as used herein can be interpreted as "when" or "upon" or "in response to determining".
[0031] To solve at least one of the problems in the related art mentioned in the background section, the first aspect of the present disclosure provides a medical pressure measuring device. The medical pressure measuring device comprises a pipe, a fluid channel is arranged in the pipe; an expansion element is arranged on the outer wall of the pipe and at least partially communicates with the fluid channel to expand or contract following the change of pressure in the fluid channel; a pressure measuring element is located on the side of the expansion element away from the axis of the pipe, the pressure measuring element is used to measure the pressure transmitted by the expansion element; a limiting element is at least partially located between the expansion element and the pressure measuring element, the limiting element deforms following the change of pressure in the fluid channel to transmit the pressure in the fluid channel to the pressure measuring element, and is used to limit the expansion amount of the expansion element.
[0032] As shown in the embodiment of Figure 1 , which shows an exploded structural schematic diagram of the medical pressure measuring device of the present disclosure. The medical pressure measuring device comprises a pipe 102, a fluid channel is arranged in the pipe 102 to introduce the fluid to be measured into the medical pressure measuring device through the pipe 102 to achieve the purpose of pressure measurement. For example, the fluid flow direction is as shown in Figure 3 , that is, flowing from the A end to the B end of the pipe. The pipe 102 can be provided in various geometric shapes, Figure 1The circular tube shown is merely an example. Furthermore, it also includes an expansion element 106, which is disposed on the outer wall of the pipe and at least partially communicates with the fluid channel to expand or contract in response to pressure changes within the fluid channel. It is understood that the direct purpose of this disclosure is to measure the fluid pressure within pipe 102, but due to the obstruction of the pipe wall, the pressure within pipe 2 cannot directly act on the pressure sensor. Therefore, this disclosure employs an expansion element to transmit the fluid pressure within the pipe. Specifically, the expansion element needs to be in communication with the fluid within the pipe. Exemplarily, an opening can be made in the pipe to allow fluid to flow into the expansion element. For this purpose, the expansion element 106 needs to be disposed on the outer wall of the pipe 102. In some embodiments, the expansion element can be laid at the opening in the pipe wall, and the joint between the two can be sealed to prevent fluid leakage from the contact surface. Preferably, as... Figure 3 As shown, the opening is a through hole 201. At least one through hole is provided on the pipe wall of the pipe, with one end of the through hole connected to the fluid channel and the other end abutting against at least a portion of the expansion element. This allows the fluid in the pipe to contact the expansion element through the through hole, ultimately transmitting fluid pressure from the pipe 102 to the expansion element. In practice, machining through holes on the pipe wall is relatively easy, significantly reducing the manufacturing cost of the opening. In some embodiments, the size or number of through holes can be flexibly adjusted according to usage requirements. When a high pressure measurement response speed is required, the diameter of the through hole can be appropriately increased, and / or the number of through holes can be increased. In other embodiments, the expansion element not only needs to have good mechanical properties to withstand repeated fluid pressure, i.e., the expansion element needs to be durable and tear-resistant, but also needs to have excellent biocompatibility, not causing immune or allergic reactions upon contact with the human body, and can be safely used in instruments requiring long-term contact. Furthermore, the expansion element also needs to be chemically stable and have good softness and elasticity, making it easy to customize complex shapes. Therefore, in some embodiments of this disclosure, the expansion element is preferably made of a silicone-based material. The medical pressure measuring device also includes a pressure measuring element 301 (see...). Figure 4), which is used to receive the pressure transmitted by the expansion element and measure the pressure to obtain the real-time pressure in the pipeline 102. In particular, some embodiments of the present disclosure also provide a limiting element, which limits the expansion amount of the expansion element, thereby avoiding excessive expansion of the expansion element, which can cause significant increase in internal stress of the expansion element and exceed the tensile strength of the expansion element, resulting in tearing or damage of the expansion element, etc. The service life and safety of the medical pressure measuring device are effectively improved. The problem of damage of the membrane in the prior art when measuring large pressure is solved, and the application range of the medical pressure measuring device is improved.
[0033] In some optional embodiments, the expansion element is sleeved on the outer wall of the pipeline and is in sealed connection with the outer wall. Figure 1 and 3 In the embodiments shown in Figure 3 The cross-sectional structure schematic diagram of the expansion element 106 sleeved on the outside of the pipeline 102 is shown. In this embodiment, the sleeved expansion element 106 covers the through hole 201. In order to avoid leakage of fluid from the through hole into the expansion element and then from the gap between the expansion element and the outer wall of the pipeline, the problem can be solved by sealing the two ends of the expansion element. Compared with the scheme of locally applying the non-sleeved expansion element to the opening, the preferred embodiment of the present disclosure adopts the sleeved expansion element, which consumes more materials, but this scheme is easy to assemble the expansion element and the pipeline, and is more conducive to sealing the gap between the expansion element and the outer wall of the pipeline. The problem of sealing the gap will be described in detail later.
[0034] In some optional embodiments, the limiting element includes a first clamping portion and a moving portion, the moving portion can be limitedly moved relative to the first clamping portion, the moving portion is connected with the expansion element, and the moving portion moves following the expansion or contraction of the expansion element. The limiting element can be used to control the deformation amount of the expansion element, thereby avoiding tearing, damage, etc. caused by excessive expansion of the expansion element. In order to further solve the problem that the expansion element is directly exposed or is in contact with the sensor element in the exposed state and is easy to be damaged, some embodiments of the present disclosure further provide a moving portion between the expansion element and the sensor element, the moving portion can not only be used to protect the expansion element, but also can transmit pressure. As shown in Figure 1 and 4In the embodiment shown, the moving part 104, 109 and the first clamping part 103 are used together to limit the deformation of the expansion element and to close the expansion element to avoid direct exposure. In some embodiments, the moving part can be composed of two separate elements, such as the first moving part 109 and the second moving part 104; and the first moving part 109 and the second moving part 104 are connected by splicing. This structure facilitates the connection between the moving part and the expansion element 106. See Figure 1 and Figure 4 wherein the expansion element 106 includes a hollow tubular body and an extension 110 protruding from the body and extending away from the body. When installed, the extension 110 can be clamped between the first moving part 109 and the second moving part 104, and then the first moving part and the second moving part are fixedly connected to complete the connection between the moving part and the expansion element. As shown in Figure 4 the first clamping part 103 is overall covered above the moving part and the expansion element, and the first clamping part 103 has an internal accommodating cavity to accommodate the moving part. And in the assembled state, the moving part can move in the accommodating cavity relative to the first clamping part 103. Preferably, the accommodating cavity has a limiting structure to limit the maximum stroke of the moving part. As shown in Figure 4 the limiting structure is composed of the inner wall of the accommodating cavity, and the inner wall cooperates with the outer wall of the moving part to make the maximum stroke of the moving part G. It can be understood that by reasonably designing the value of the maximum stroke G, the expansion amount of the expansion element 106 can be constrained to avoid damage. At the same time, since the expansion element is covered and protected by the moving part, the pressure transmitted by the expansion element is transmitted to the sensing element through the moving element, thereby avoiding direct contact between the expansion element and the external sensing element, and improving the safety in use. In some embodiments, the sensing element can be arranged at the lower end of the mounting part 108; and when the expansion element 106 expands under the action of fluid pressure, the moving part is driven to move towards and contact the sensing element, so that the sensing element can measure the fluid pressure. When the fluid pressure decreases and the expansion element 106 contracts, the expansion element 106 will drive the moving part to retract and move away from the sensing element. As shown in Figure 4The assembly between the moving part and the expansion element 106 is only an example. In other embodiments, the moving part can be designed as an integrated structure, and the expansion element and the moving part can be connected by adhesion, heat melting or other methods. Preferably, to facilitate the connection between the expansion element and the moving part, the connection between the moving part and the expansion element can be designed such that at least part of the profile of the moving part is adapted to the profile of the outer wall of the pipeline. Since the expansion element is a film-like structure, when it is connected to the pipeline 102, it is necessarily the same or substantially the same as the outer profile of the pipeline. At this time, only the profile of the end of the moving part close to the pipeline 102 needs to be designed to be the same as the outer profile of the pipeline 102, so that under the condition of no fluid pressure, the moving part, the expansion element and the pipeline are sequentially and lap-jointedly attached, which can be seen from the assembly diagram shown in Figure 4 .
[0035] In some optional embodiments, the first clamping part includes a through hole, the moving part is in contact or separated from the pressure measuring element through the through hole, when the expansion element expands, the moving part moves along the through hole towards the pressure measuring element, or when the expansion element contracts, the moving part moves along the through hole away from the pressure measuring element. As shown in Figure 4 , the through hole can be arranged in the first clamping part, and the moving part is at least partially moved in the through hole to improve the movement stability of the moving part. Preferably, the sensing element is a pressure measuring element, and the pressure measuring element is arranged at one end of the mounting part 108 facing the moving part. In use, when the fluid pressure of the pipeline 102 increases and the expansion element expands, the moving part moves along the through hole towards the pressure measuring element and finally abuts against the pressure measuring element, so that the pressure measuring element can obtain the pressure in the pipeline in real time. When the fluid pressure in the pipeline decreases and the expansion element contracts, the moving part is driven by the expansion element to move along the through hole away from the pressure measuring element and finally away from the pressure measuring element. Since the limiting element has been described above to limit the expansion amount of the expansion element, the movement amount of the moving part is also limited. Therefore, in order to enable the moving part to smoothly contact the pressure measuring element, the position of the measuring unit also needs to be further limited. Therefore, in some optional embodiments, the maximum stroke G of the moving part is greater than the maximum distance between the pressure measuring element and the moving part. As shown in Figure 4As shown, the pressure measuring element is installed on the lower surface of the mounting portion 108. The maximum distance between the moving portion and the pressure measuring element is H, i.e. the maximum distance between the upper surface of the moving portion and the lower surface of the pressure measuring element is H. Since the maximum stroke G is greater than the maximum distance H, the moving portion can be in contact with the pressure measuring element after the expansion element is fully expanded. It can be understood that if the difference between the maximum stroke G and the maximum distance H is too large, not only the overall size of the measuring device will be too large, but also the risk of damaging the pressure measuring element will exist. Therefore, in some preferred embodiments of the present disclosure, the difference between the maximum stroke G and the maximum distance H is controlled between 0.05 mm and 1 mm (including the end values).
[0036] In some optional embodiments, a second clamping portion 101 is further included, which is located on the two sides of the pipeline together with the first clamping portion. The second clamping portion 101 cooperates with the first clamping portion 103 to clamp the pipeline and the expansion element, so as to avoid leakage of fluid from the connection between the pipeline and the expansion element. Figure 1 In the embodiments shown in 3-4, the first clamping portion 103 and the second clamping portion 101 together constitute the shell part of the medical pressure measuring device, which clamps the pipeline 102, the expansion element 106, the moving portion, etc. inside it. Figure 1 As shown, the first clamping portion and the second clamping portion are respectively provided with a semicircular structure that cooperates with each other, and the diameter of the semicircular structure is smaller than the outer wall diameter of the expansion element. When the sleeved pipeline and expansion element are placed in the semicircular structure between the first clamping portion and the second clamping portion for clamping, since the diameter of the semicircular structure is smaller than the outer wall diameter of the expansion element, the expansion element is clamped between the pipeline and the first clamping portion and the second clamping portion, showing a similar interference fit assembly relationship. This assembly method makes the expansion element tightly adhere to the outer wall of the pipeline, effectively avoiding leakage of fluid from the fitting surface between the expansion element and the outer wall of the pipeline. As can be seen, in the present disclosure, the first clamping portion and the second clamping portion are provided separately, and the size relationship between the structures is reasonably set, so that the gap between the pipeline and the expansion element can be sealed by clamping. This setting method not only can reduce the assembly difficulty, but also avoids the use of additional sealing materials or sealing process, effectively reducing the manufacturing cost.
[0037] In some optional embodiments, a connecting element is further included, which is connected with the limiting element, and the connecting element is used to fix the limiting element at a target position. Figure 1In the embodiment, the medical pressure measuring device is provided with a connecting element 105, which can be a magnet, a screw or other fastener. When it is necessary to fix it to the target position 107, it is only necessary to correctly assemble the connecting element. Preferably, the connecting element 105 is a magnet, and the corresponding target position is also provided with a magnet or is made of ferrous material, so that the limiting element can be quickly fixed to the target position 107 by magnetic attraction. When the fixing method is not satisfactory, the magnetic attraction position can be adjusted, greatly improving the flexibility of the instrument installation and the convenience of the position adjustment. Preferably, the connecting element can be provided as two or even more, so as to improve the connection strength and positioning accuracy.
[0038] The second aspect of the present disclosure provides a fluid infusion system, which comprises a fluid infusion pipeline and the medical pressure measuring device of any one of the first aspect, wherein the fluid infusion pipeline is in fluid communication with the medical pressure measuring device. In practice, the fluid infusion system is a commonly used medical device, and how to measure the infusion pressure in real time is an important prerequisite to ensure medical safety. Therefore, the infusion pipeline to be measured can be connected to the medical pressure measuring device described in any one of the embodiments of the first aspect of the present disclosure, so that the fluid pressure in the infusion pipeline of the infusion system can be safely and reliably obtained.
[0039] The above detailed description does not constitute a limitation on the protection scope of the present disclosure. Those skilled in the art will easily think of other embodiments of the present disclosure after considering the specification and practicing the technical solutions disclosed in the present disclosure. The present application is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field of the present disclosure which are not disclosed in the present disclosure. The specification and examples are only considered as exemplary, and the true scope and spirit of the present disclosure are indicated by the following claims.
[0040] It should be understood that the present disclosure is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims
1. A medical pressure measuring device, comprising: a tube having a fluid channel therein; an expansion element disposed on an outer wall of the tube and at least partially in communication with the fluid channel to expand or contract in response to a change in pressure in the fluid channel; a pressure measuring element disposed on a side of the expansion element distal to an axis of the tube, the pressure measuring element configured to measure a pressure transmitted by the expansion element; and a limiting element at least partially disposed between the expansion element and the pressure measuring element, the limiting element configured to deform in response to a change in pressure in the fluid channel to transmit the pressure in the fluid channel to the pressure measuring element and to limit an amount of expansion of the expansion element.
2. The medical pressure measuring device of claim 1, wherein: the tube has at least one through hole formed therein, the through hole having one end in communication with the fluid channel along an axis of the through hole and another end abutting at least a portion of the expansion element.
3. The medical pressure measuring device of claim 1 or 2, wherein: the expansion element is disposed around the outer wall of the tube and is in sealed connection with the outer wall.
4. The medical pressure measuring device of claim 1, wherein: the limiting element includes a first clamping portion and a moving portion, the moving portion being configured to be movably limited relative to the first clamping portion; the moving portion is connected to the expansion element, and the moving portion is configured to move in response to expansion or contraction of the expansion element.
5. The medical pressure measuring device of claim 4, wherein: the first clamping portion includes a through hole, the moving portion is configured to contact or separate from the pressure measuring element through the through hole; and the moving portion is configured to move along the through hole in a direction closer to the pressure measuring element when the expansion element expands, or the moving portion is configured to move along the through hole in a direction away from the pressure measuring element when the expansion element contracts.
6. The medical pressure measuring device of claim 5, wherein: a maximum stroke of the moving portion is greater than a maximum distance between the pressure measuring element and the moving portion.
7. The medical pressure measuring device of claim 6, wherein: at least a portion of the moving portion is configured to match a profile of the outer wall of the tube at a connection between the moving portion and the expansion element.
8. The medical pressure measuring device of claim 4, further comprising: a second clamping portion disposed on a side of the tube opposite the first clamping portion, the second clamping portion being configured to clamp the tube and the expansion element together with the first clamping portion to prevent fluid leakage from a connection between the tube and the expansion element.
9. The medical pressure measuring device of any one of claims 1 to 8, further comprising: a connecting element connected to the limiting element, the connecting element being configured to fix the limiting element at a target position. 10. A fluid infusion system, characterized by: A medical pressure measurement device as claimed in any one of claims 1 to 9, comprising a fluid priming line in fluid communication with the medical pressure measurement device.