Pressure measuring injector

Abstract

The pressure measuring injector comprises a tube body, a piston rod and a blood flow velocity measuring assembly, the tube body comprises an insertion tube, a connecting piece and an injection tube which are sequentially connected, the insertion tube is provided with a first sample channel penetrating through the insertion tube, the injection tube is provided with a second sample channel penetrating through the injection tube, and the connecting piece is provided with an assembly groove. The first sample channel, the assembling groove and the second sample channel are sequentially communicated, a rotating plug is rotationally assembled in the assembling groove, the assembling groove is in sealed connection with the rotating plug, the rotating plug is provided with a third sample channel, and the piston rod is assembled in the second sample channel and is in sealed fit with the inner wall of the second sample channel; the blood flow velocity measuring assembly is arranged on the insertion tube, the rotating plug or the injection tube and used for measuring the pressure of a sample flowing into the blood flow velocity measuring assembly. The blood flow velocity is measured in an auxiliary mode through the blood flow velocity measurement assembly, interference of external factors is reduced, and the high accuracy of a measurement result is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical technology field especially, relate to a pressure measuring syringe. BACKGROUND

[0002] In modern medicine, blood purification therapy (such as hemodialysis, plasma exchange, etc.) has become an important means of treating renal failure, poisoning and certain immune system diseases. This process relies on an effective vascular access, which not only serves as a bridge connecting the patient and the blood purification device, but also is one of the key factors to ensure the treatment effect. The ideal vascular access should be able to provide a sufficiently stable blood flow rate to ensure sufficient solute clearance rate, while minimizing the adverse effects on the patient.

[0003] For blood purification therapy, it is crucial to achieve a blood flow rate of 200-300 ml / min. If blood purification therapy is performed without meeting the blood flow rate, it may lead to frequent machine alarms and even temporary suspension of treatment. This not only prolongs the treatment time, but also increases the likelihood of clotting in the filter, thereby increasing the treatment cost. However, in actual operation, it is not easy to accurately detect the blood flow rate. The traditional method is usually to judge whether the pipeline has reached the required blood flow rate by withdrawing 20 milliliters of blood within 4 seconds using a syringe. This method is highly dependent on the experience and technical level of the operator, so its accuracy may be greatly influenced by human factors. If the withdrawal is not accurate, frequent withdrawal operations will increase the chance of contamination of the catheter insertion site, thereby increasing the risk of blood flow infection. SUMMARY

[0004] To overcome at least one of the deficiencies described in the prior art, the utility model provides a pressure measuring syringe, which can solve the problem of large blood flow rate measurement error caused by the judgment of blood flow rate only through syringe withdrawal in the prior art.

[0005] The utility model adopts the technical scheme of:

[0006] A pressure measuring syringe, comprising:

[0007] The tube body comprises an insertion tube, a connecting piece and an injection tube connected in sequence, the insertion tube is provided with a first sample channel penetrating through the insertion tube, the injection tube is provided with a second sample channel penetrating through the injection tube, the connecting piece is provided with a fitting groove, the first sample channel, the fitting groove and the second sample channel are communicated in sequence, a rotating plug is rotatably fitted in the fitting groove, and the fitting groove is in sealed connection with the rotating plug, the rotating plug is provided with a third sample channel, so that the rotating plug is rotated to adjust the third sample channel to communicate with the first sample channel and the second sample channel, or the rotating plug is rotated to cut off the communication between the first sample channel and the second sample channel;

[0008] A piston rod is fitted in the second sample channel, and the piston rod is in sealed fit with the inner wall of the second sample channel;

[0009] A blood flow velocity measuring assembly is arranged on the insertion tube, the rotating plug or the injection tube, and is used for measuring the pressure of the sample flowing into the blood flow velocity measuring assembly.

[0010] Further, the blood flow velocity measuring assembly comprises a flow rate measuring sensor, a controller and a communication module, the flow rate measuring sensor is embedded in the rotating plug and is used for measuring the flow rate of the sample flowing in the third sample channel, the controller is electrically connected with the flow rate measuring sensor and the communication module respectively, so that the signal collected by the flow rate measuring sensor is transmitted to an external data display instrument through the communication module.

[0011] Further, the blood flow velocity measuring assembly comprises a sample tube, one end of the sample tube is communicated with the first sample channel, and the other end is provided with a vent hole.

[0012] Further, a scale line is arranged outside the sample tube.

[0013] Further, an enclosing groove is arranged on the outer wall of the injection tube, and the sample tube is detachably fitted in the enclosing groove, so as to block the vent hole.

[0014] Further, a rotating handle is connected with the rotating plug, and the rotating handle is located outside the fitting groove.

[0015] Further, an extension table is arranged on the side of the rotating plug away from the fitting groove, the rotating handle is in a cylindrical shape, the rotating handle passes through the extension table, and both ends of the rotating handle are located outside the extension table.

[0016] Further, the rotating handle is in a cross shape.

[0017] Further, the assembling groove is internally provided with an annular groove, and the rotating plug is provided with an annular convex edge corresponding to the annular groove, and the annular convex edge is clamped in the annular groove.

[0018] Further, the annular convex edge is made of flexible high polymer material.

[0019] In conclusion, the pressure measuring syringe has the following technical effects:

[0020] 1. The blood flow velocity measuring assembly is ingeniously integrated on the insertion tube, the rotating plug or the injection tube of the tube body, so that the blood flow velocity measuring assembly can directly measure the pressure of the sample flowing through the blood flow velocity measuring assembly, thereby providing more accurate data.

[0021] 2. The pressure measuring syringe still retains the traditional structure of the original insertion tube, injection tube and piston rod.

[0022] 3. The rotating plug can flexibly control the communication between the insertion tube and the injection tube. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Fig. 1 is a state sectional view of the flow velocity measuring sensor of the blood flow velocity measuring assembly of the utility model;

[0024] Figure 2 Fig. 2 is a state first sectional view of the sample tube of the blood flow velocity measuring assembly of the utility model;

[0025] Figure 3 Fig. 3 is a state second sectional view of the sample tube of the blood flow velocity measuring assembly of the utility model;

[0026] Figure 4 Fig. 4 is an exploded structural schematic view of the insertion tube part of the pressure measuring syringe of the utility model.

[0027] Wherein, the reference mark meaning as follows: 1, insert pipe; 11, first sample channel; 2, connecting piece; 21, assembly groove; 211, annular groove; 22, rotating plug; 221, third sample channel; 222, rotating handle; 223, extension platform; 224, annular convex edge; 3, injection pipe; 31, second sample channel; 32, closed groove; 4, piston rod; 51, sensor; 52, controller; 6, sample tube. DETAILED DESCRIPTION

[0028] In order to better understand and implement, the following will be combined with the drawings of the utility model, the technical scheme in the embodiment of the utility model is clearly and completely described and discussed, obviously, only a part of the utility model described here, not all examples, based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative efforts, belong to the protection scope of the utility model.

[0029] In order to facilitate the understanding of the embodiment of the utility model, the following will be combined with the drawings to further explain and describe specific examples, and each embodiment does not constitute the limitation of the embodiment of the utility model.

[0030] In the description of the utility model, it is necessary to explain that the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as the limitation of the utility model.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing the specific embodiments, and are not intended to limit the utility model.

[0032] Reference Figures 1-4The utility model discloses a kind of pressure measuring syringes, including tube body, piston rod 4 and blood flow velocity measurement component, tube body includes sequentially linked insertion tube 1, connecting piece 2 and injection tube 3, insertion tube 1 is equipped with the first sample channel 11 that passes through insertion tube 1, injection tube 3 is equipped with the second sample channel 31 that passes through injection tube 3, connecting piece 2 is equipped with assembly groove 21, first sample channel 11, assembly groove 21 and second sample channel 31 sequentially communicate, rotating plug 22 is rotatably assembled in assembly groove 21, and assembly groove 21 is sealingly connected with rotating plug 22, rotating plug 22 is equipped with third sample channel 221, to make rotating plug 22 rotate to adjust third sample channel 221 communication first sample channel 11 and second sample channel 31, or, rotating rotating plug 22 cuts off the communication of first sample channel 11 and second sample channel 31, piston rod 4 is assembled in second sample channel 31, and piston rod 4 is sealingly attached with the inner wall of second sample channel 31, blood flow velocity measurement component is located on insertion tube 1, rotating plug 22 or injection tube 3, to measure the pressure of sample flowing into blood flow velocity measurement component.

[0033] Specifically, tube body is sequentially linked by insertion tube 1, connecting piece 2 and injection tube 3, insertion tube 1 is equipped with the first sample channel 11 that passes through, and injection tube 3 is equipped with the second sample channel 31 that passes through. Connecting piece 2 is equipped with assembly groove 21, first sample channel 11, assembly groove 21 and second sample channel 31 sequentially communicate. Rotating plug 22 is located in assembly groove 21, and sealingly connected with assembly groove 21. Rotating plug 22 is equipped with third sample channel 221, and the communication state between third sample channel 221 and first sample channel 11 and second sample channel 31 is adjusted or cut off by rotating rotating plug 22. That is, when the two ends of third sample channel 221 are connected with first sample channel 11 and second sample channel 31 respectively, first sample channel 11 and second sample channel 31 communicate, that is, insertion tube 1 and injection tube 3 communicate;When rotating rotating plug 22 to third sample channel 221 is not communicated with first sample channel 11 and second sample channel 31, that is, first sample channel 11 and second sample channel 31 are blocked by the side wall of rotating plug 22, and cannot communicate, that is, the communication of insertion tube 1 and injection tube 3 is cut off. Piston rod 4 is assembled in second sample channel 31, and sealingly attached with the inner wall of second sample channel 31, allowing manual operation to perform traditional blood flow velocity verification, such as pulling piston rod 4 to observe sample flow condition. Blood flow velocity measurement component is located on insertion tube 1, rotating plug 22 or injection tube 3, for directly measuring the sample pressure flowing through the component, so as to reflect blood flow velocity. Since the volume of these positions is small, only a small amount of sample needs to be collected to complete the measurement, reducing the risk of sample contamination.

[0034] The specific blood flow velocity measuring component can directly measure the flow velocity data of the flow velocity measuring component, measure the pressure of the sample through the pressure measuring component, and then convert the pressure data into flow velocity data for display, or use other components that can accurately detect the flow velocity of the sample, which is not limited here.

[0035] Referring to Figure 1 As shown in some embodiments, the blood flow velocity measuring component includes a flow velocity measuring sensor 51, a controller 52 and a communication module. The flow velocity measuring sensor 51 is embedded in the rotating plug 22 for measuring the flow velocity of the sample flowing in the third sample channel 221. The controller 52 is electrically connected to the flow velocity measuring sensor 51 and the communication module, respectively, so that the signal collected by the flow velocity measuring sensor 51 is transmitted to the external data display instrument through the communication module.

[0036] Specifically, the flow velocity measuring sensor 51 is embedded in the rotating plug 22 to directly detect the flowing sample in the third sample channel 221, thereby ensuring real-time monitoring of the sensor 51. The controller 52 is connected to the flow velocity measuring sensor 51 and the communication module through electrical connection, forming a complete signal processing loop. The controller 52 is responsible for receiving the signal from the flow velocity measuring sensor 51 and transmitting it to the communication module for transmission to the external device. The communication module can be of wired or wireless type according to actual needs. For example, wireless technologies such as Bluetooth, Wi-Fi, Zigbee, or wired interfaces such as USB, RS232.

[0037] Working principle of the above structure:

[0038] Adjust the rotating plug 22 to the position where the third sample channel 221 is in communication with the first sample channel 11 and the second sample channel 31, and insert the insertion tube 1 into the tube head of the dialysis tube. The blood in the dialysis tube will flow into the third sample channel 221 through the first sample channel 11. When the blood flows in the third sample channel 221, the flow velocity measuring sensor 51 measures the flow velocity of the blood and transmits the data to the controller 52, which is then transmitted to the display screen of the dialysis instrument through the communication module electrically connected to the controller 52 for data display, facilitating intuitive observation of the blood flow velocity data by inexperienced medical staff.

[0039] Of course, when the medical staff needs to verify the data, the corresponding more blood will flow through the first sample channel 11, the third sample channel 221 to the second sample channel 31 by pulling the piston rod 4, and more blood flow velocity dynamic data will be monitored in the third sample channel 221 in the process. It should be noted that although pulling the piston rod 4 can accelerate the blood flow rate to some extent, it will not have a significant impact on the blood flow rate due to the influence of the inner diameter of the dialysis catheter. The data collected by the blood flow rate sensor 51 still has reference value. On the basis of the above-mentioned data with reference value, if the medical staff still needs to verify the data, the blood flow into the second sample channel 31 can be continued to be drawn back according to the speed, and whether the standard of 4s back 20ml can be reached in the second sample channel 31 can be observed.

[0040] Referring to Figures 2-4 As shown in some embodiments, the blood flow velocity measuring assembly comprises a sample tube 6, one end of which is in communication with the first sample channel 11, and the other end is provided with a vent hole.

[0041] Specifically, one end of the sample tube 6 is in direct communication with the first sample channel 11 of the insertion tube 1, so that the sample can flow smoothly from the first sample channel 11 into the sample tube 6. The other end of the sample tube 6 is designed with a vent hole, which can make the blood flowing into the sample tube 6 not affected by the air pressure in the sample tube 6.

[0042] The working principle of the above structure is as follows:

[0043] When it is necessary to use the sample tube 6 to monitor the blood flow rate, the plug 22 is adjusted to a state in which the first sample channel 11 and the second sample channel 31 are not in communication. In this state, the insertion tube 1 is inserted into the dialysis catheter, and the blood in the dialysis catheter flows into the sample tube 6 through the first sample channel 11. During the automatic flow of blood, it can be judged whether the blood flow rate reaches the standard of 200-300ml / min blood flow rate when the blood level flows to the predetermined level within the predetermined time.

[0044] Specifically, since the pipe diameter and the volume per unit length of the sample tube are known data, the blood flow rate in the sample tube is measured. The predetermined liquid level position in the sample tube 6 corresponds to a fixed volume. Within a predetermined time, i.e., a sufficient volume of blood can flow in within a predetermined time, i.e., corresponding to the standard of 4s back 20ml. The above does not need to be operated by the medical staff to continuously draw back the blood by pulling the piston rod 4, which reduces the human operation variables in the process, and further improves the accuracy of pressure measurement.

[0045] Referring to Figures 2-4As shown, in some embodiments, the sample tube 6 is externally provided with a scale. Specifically, the scale allows medical staff to visually assess the amount of sample in the sample tube 6.

[0046] Referring to Figures 2-4 As shown, further, the syringe 3 is externally provided with a closed groove 32, and the sample tube 6 is detachably assembled in the closed groove 32 for plugging the vent hole.

[0047] Specifically, the closed groove 32 is located on the outer wall of the syringe 3, and is sized and shaped to precisely accommodate the end of the sample tube 6 provided with the vent hole, ensuring the stability and sealing of the sample tube 6 after installation. The end of the sample tube 6 is detachably assembled into the closed groove 32 by plug-in, and this structure allows medical staff to easily plug or unplug the vent hole of the sample tube 6 as needed.

[0048] When it is necessary to verify the blood flow rate using the conventional method, the sample tube 6 is assembled into the closed groove 32 to plug the vent hole, ensuring that the blood does not flow into the sample tube 6, but directly into the second sample channel 31. After plugging the vent hole, the piston rod 4 is pulled, so that the blood flows from the insertion tube 1, through the first sample channel 11, the third sample channel 221 of the rotating plug 22, and finally into the second sample channel 31. At this time, medical staff can determine whether 20 milliliters of blood can be successfully withdrawn within 4 seconds by observing the scale on the syringe 3. If this standard can be met within the specified time, it indicates that the blood flow rate meets the requirements (200-300 ml / min); otherwise, further inspection of the vascular access or adjustment of the equipment settings may be required.

[0049] Referring to Figure 4 As shown, in some embodiments, the rotating plug 22 is connected with a rotating handle 222, and the rotating handle 222 is located outside the assembly groove 21.

[0050] Specifically, the rotating handle 222 is connected with the rotating plug 22. This connection ensures that the rotating plug 22 can be rotated synchronously when the user rotates the handle, achieving precise control of the sample channel.

[0051] Referring to Figure 4 As shown, in some embodiments, the rotating plug 22 is provided with an extension platform 223 on the side away from the assembly groove 21, the rotating handle 222 is cylindrical, and the rotating handle 222 passes through the extension platform 223, both ends of the rotating handle 222 being located outside the extension platform 223.

[0052] Specifically, both ends of the rotating handle 222 are located outside the extension platform 223, which facilitates the user to directly grasp and rotate the handle with his hand.

[0053] Further, the rotating handle 222 is cross-shaped. The cross-shaped rotating handle 222 is more convenient for medical staff to operate with bare hands.

[0054] Referring to Figure 4 As shown in the drawings, in some embodiments, the assembly groove 21 is provided with an annular groove 211, and the rotating plug 22 is provided with an annular protrusion 224 corresponding to the annular groove 211, which is clamped in the annular groove 211.

[0055] Specifically, the annular groove 211 is located inside the assembly groove 21 and surrounds the inner wall of the entire assembly groove 21. The width and depth of the annular groove 211 correspond to the annular protrusion 224 to ensure that the annular protrusion 224 on the rotating plug 22 can be accommodated and tightly fitted. Since the diameters of the first sample channel 11, the second sample channel 31 and the third sample channel 221 are relatively small, any misalignment will cause misalignment between the third sample channel 221 and the first sample channel 11 and the second sample channel 31, thereby affecting the measurement result. The tight fit of the annular groove 211 and the annular protrusion 224 effectively prevents misalignment and ensures the accuracy of the measurement.

[0056] Further, the annular protrusion 224 is made of a flexible polymer material.

[0057] Specifically, the flexible polymer material (such as medical-grade silicone or rubber) has excellent softness and elasticity, so that the annular protrusion 224 can be easily inserted into the annular groove 211. Even if there is a slight size deviation between the assembly groove 21 and the rotating plug 22, the flexible material can adapt to these differences by itself deformation, ensuring smooth assembly. And because of the characteristics of the flexible polymer material, the assembly process does not require the use of complex tools or the application of excessive force. The producer or medical staff only needs to use small pressure to insert the rotating plug 22 into the assembly groove 21, and the annular protrusion 224 will naturally be inserted into the annular groove 211, achieving quick and easy assembly.

[0058] The technical means disclosed by the utility model scheme is not limited to the technical means disclosed by the above-mentioned embodiments, but also includes the technical scheme composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principle of the utility model, some improvements and refinements can be made, and these improvements and refinements are also considered as the protection scope of the utility model.

Claims

1. A pressure measuring syringe, characterized by, The application relates to a blood flow velocity measuring device, which comprises the following parts: a tube body, which comprises an insertion tube (1), a connecting piece (2) and an injection tube (3) connected in sequence, the insertion tube (1) is provided with a first sample channel (11) penetrating through the insertion tube (1), the injection tube (3) is provided with a second sample channel (31) penetrating through the injection tube (3), the connecting piece (2) is provided with an assembly groove (21), the first sample channel (11), the assembly groove (21) and the second sample channel (31) are connected in sequence, a rotating plug (22) is rotatably assembled in the assembly groove (21), and the assembly groove (21) is in sealing connection with the rotating plug (22), the rotating plug (22) is provided with a third sample channel (221), so that the rotating plug (22) is rotated to adjust the third sample channel (221) to be connected with the first sample channel (11) and the second sample channel (31), or the rotating plug (22) is rotated to cut off the connection between the first sample channel (11) and the second sample channel (31); a piston rod (4) is assembled in the second sample channel (31), and the piston rod (4) is in sealing contact with the inner wall of the second sample channel (31); a blood flow velocity measuring assembly is arranged on the insertion tube (1), the rotating plug (22) or the injection tube (3) and used for measuring the pressure of a sample flowing into the blood flow velocity measuring assembly.

2. A pressure measuring syringe according to claim 1, wherein The blood flow velocity measuring assembly comprises a flow velocity measuring sensor (51), a controller (52) and a communication module, the flow velocity measuring sensor (51) is arranged in the rotating plug (22) and used for measuring the flow velocity of a sample flowing in the third sample channel (221), the controller (52) is electrically connected with the flow velocity measuring sensor (51) and the communication module respectively, so that the signal collected by the flow velocity measuring sensor (51) is transmitted to an external data display instrument through the communication module.

3. A pressure measuring syringe according to claim 1, wherein The blood flow velocity measuring assembly comprises a sample tube (6), one end of the sample tube (6) is connected with the first sample channel (11), and the other end is provided with a vent hole.

4. A pressure measuring syringe according to claim 3, wherein The sample tube (6) is externally provided with a scale line.

5. A pressure measuring syringe according to claim 3, wherein The outer wall of the injection tube (3) is provided with a closed groove (32), and the sample tube (6) is detachably assembled in the closed groove (32) and used for plugging the vent hole.

6. A pressure-equalizing syringe according to any one of claims 1-5, characterized in that The rotating plug (22) is connected with a rotating handle (222), and the rotating handle (222) is located outside the assembly groove (21).

7. A pressure measuring syringe according to claim 6, wherein The rotating plug (22) is provided with an extension table (223) away from the assembly groove (21), the rotating handle (222) is in a cylindrical shape, the rotating handle (222) passes through the extension table (223), and both ends of the rotating handle (222) are located outside the extension table (223).

8. A pressure measuring syringe according to claim 7, wherein The rotating handle (222) is in a cross shape.

9. A pressure-equalizing syringe according to any one of claims 1-5, characterized in that The assembling groove (21) is internally provided with an annular groove (211), and the rotating plug (22) is provided with an annular convex edge (224) corresponding to the annular groove (211), and the annular convex edge (224) is clamped in the annular groove (211).

10. A pressure measuring syringe according to claim 9, wherein The annular convex edge (224) is made of flexible high polymer material.

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