Blood collection device for hemodialysis care

Abstract

The present application relates to the field of medical auxiliary equipment, in particular to a blood collection device for hemodialysis nursing, comprising a transparent cabin, a buffer core is slidingly matched in the transparent cabin, the transparent cabin is communicated with an inflow pipe, an outflow pipe and an infusion pipe for conveying anticoagulant, and a connector is fixedly connected to the end of the inflow pipe away from the transparent cabin; when blood flows through the transparent cabin, the buffer core is suspended in the transparent cabin. An adjusting assembly for adjusting the size of blood flow rate and a sealing assembly for sealing the connector are arranged on the outer side of the transparent cabin; a valve assembly for adjusting the opening size of the infusion pipe is arranged on the buffer core; the adjusting assembly is used to drive the sealing assembly and the valve assembly to operate synchronously, so as to seal the connector when adjusting the size of blood flow rate, and synchronously adjust the opening size of the anticoagulant conveying amount. The present application is used to improve the safety, effectiveness and nursing efficiency of dialysis treatment.

Description

Technical Field

[0001] This invention relates to the field of medical auxiliary devices, specifically to a blood collection device for hemodialysis nursing. Background Technology

[0002] Hemodialysis is a primary treatment for acute and chronic renal failure and uremia. Its principle involves establishing extracorporeal circulation, drawing the patient's blood out of the body, exchanging substances through a dialyzer, and then returning it to the body. Frequent blood samples need to be collected before, during, and after dialysis treatment to monitor electrolytes, blood urea nitrogen, creatinine, and other indicators, in order to assess dialysis adequacy and changes in the patient's condition. Due to the unique vascular conditions of dialysis patients (repeated punctures leading to fragile and inelastic vessel walls) and complex blood flow pathways (arteriovenous fistulas or central venous catheters), higher demands are placed on the safety, stability, and ease of operation of blood collection devices.

[0003] Currently, in clinical practice, blood collection for hemodialysis requires separate, independent steps. This approach has several drawbacks: First, the multi-step process relies heavily on the experience of medical staff, making it prone to timing errors or oversights. This can lead to risks such as air embolism, blood exposure, and mismatch between anticoagulant and flow rate. These risks can range from distorted blood test results to complications like tubing clotting or patient bleeding. Second, the fragmented nature of the procedures, with each adjustment taking several minutes, increases the workload for medical staff, especially when parameters need frequent adjustments based on the patient's condition. Third, existing devices often use a fixed-flow-rate anticoagulant infusion mode, failing to adjust the flow rate dynamically with changes in blood flow. This can result in uneven local anticoagulant concentrations, affecting the uniformity of anticoagulation.

[0004] Therefore, this invention proposes a blood collection device for hemodialysis nursing to improve the safety, effectiveness and nursing efficiency of dialysis treatment. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a blood collection device for hemodialysis nursing, which improves the efficiency of dialysis treatment and nursing.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A blood collection device for hemodialysis nursing includes a transparent chamber, a buffer core that slides within the transparent chamber, and an inflow tube, an outflow tube, and an infusion tube for delivering an anticoagulant connected to the transparent chamber. An interface is fixedly connected to the end of the inflow tube away from the transparent chamber. When blood flows through the transparent chamber, the buffer core is suspended within the transparent chamber.

[0007] The outside of the transparent chamber is equipped with an adjustment component for adjusting the blood flow rate and a sealing component for sealing the interface; the buffer core is equipped with a valve component for adjusting the opening of the infusion tube; the adjustment component is used to drive the sealing component and the valve component to operate synchronously, so as to seal the interface when adjusting the blood flow rate and simultaneously adjust the opening of the anticoagulant delivery volume.

[0008] The technical principles of the above solution are as follows:

[0009] The system utilizes a buffer core suspended within a transparent chamber, serving as the basis for flow rate sensing and mechanical linkage. When medical personnel operate the adjustment component, it can change the cross-sectional area of ​​the blood flow channel to adjust the required blood collection flow rate. Simultaneously, the movement of the adjustment component drives the sealing component through mechanical transmission, automatically sealing the interface to prevent leakage. At the same time, this linkage movement drives the valve component to adjust the opening of the anticoagulant infusion tube, matching the anticoagulant infusion volume with the blood flow rate.

[0010] The above approach has the following beneficial effects:

[0011] 1. This solution integrates flow rate regulation, interface sealing, and anticoagulant adjustment into a single coordinated action. By using a single action of the adjustment component, the flow rate can be adjusted by changing the cross-sectional area of ​​the flow channel, while simultaneously driving the sealing component to close the interface and adjusting the infusion rate of the anticoagulant. This coordinated operation logic reduces the time difference between multiple steps, ensures the airtightness of the pipeline connection under unstable flow rate conditions, prevents cross-infection and blood leakage, and provides a more reliable protective barrier for medical personnel.

[0012] 2. This solution utilizes an adjusting component to drive the valve assembly synchronously, causing the opening of the anticoagulant tubing to change with the blood flow rate. This mechanical proportional linkage, without the need for electronic sensors, ensures a constant anticoagulant concentration per unit volume of blood, avoiding coagulation blockage or overdose caused by drug mismatch, thus improving the stability and success rate of dialysis treatment.

[0013] 3. This solution employs a transparent chamber design combined with a suspended buffer core to achieve visualized monitoring and fluid stabilization control during the blood collection process. The transparent material allows medical personnel to directly observe the blood properties and buffer core status within the chamber, enabling the detection of air bubbles or abnormal sedimentation. The buffer core is suspended in the flow path, serving as the sensing basis for mechanical linkage. Furthermore, the integration of complex flow rate sensing, sealing control, and opening adjustment functions into the linkage structure simplifies equipment construction, reduces the failure rate, and makes the device more durable and easier to maintain in emergency care scenarios.

[0014] Furthermore, the adjustment assembly includes a fixed plate that is fixedly connected to the outer wall of the transparent cabin. The fixed plate has several inclined grooves around its circumference, and each inclined groove has a locking rod that is slidably fitted on its inner wall. Each locking rod has a sliding block fixedly connected to it. The fixed plate also has a rotating ring that is rotatably fitted on it, and the rotating ring has regular polygonal grooves.

[0015] The end of the sliding block away from the lever is fixedly connected to a locking block, which is located in a regular polygonal groove and slides against the inner wall of the regular polygonal groove. A closing layer is also provided at the connection between the inflow pipe and the transparent chamber, and the sliding block abuts against the closing layer. A drive component for driving the rotating ring to rotate is provided on the fixed plate.

[0016] Beneficial effects: By utilizing the cooperation of a regular polygonal groove and a locking block, the rotational motion of the rotating ring is converted into the radial synchronous displacement of the sliding block. The sliding block can uniformly compress the closed layer to adjust the cross-sectional area of ​​the flow channel. This design ensures precise flow rate adjustment, has a simple and reliable structure, effectively prevents blood leakage, and improves the safety of the device.

[0017] Furthermore, the drive assembly includes a drive component fixedly connected to the outer wall of the transparent cabin, and the drive component is electrically connected to a controller; the output shaft of the drive component is coaxially fixedly connected to a gear, the gear meshing with an arc-shaped rack, and the arc-shaped rack is fixedly connected to the outer wall of the rotating ring.

[0018] Beneficial effects: The controller drives the motor, and the rotational motion is transmitted to the rotating ring through the meshing of gears and an arc-shaped rack. This transmission method achieves automated control of flow rate regulation, ensuring rapid response and strong synchronization of sealing and subsequent adjustment actions, reducing human error, and improving the safety and efficiency of dialysis care.

[0019] Furthermore, the sealing assembly includes a blocking layer fixedly connected to the outer wall of the interface, and several arc-shaped rods are circumferentially hinged to the outer wall of the inflow pipe, with the ends of the arc-shaped rods away from the outer wall of the inflow pipe abutting against the outer wall of the blocking layer; a sliding ring is also slidably fitted to the side wall of the inflow pipe, and several connecting rods are circumferentially hinged to the outer wall of the sliding ring, with the ends of the connecting rods away from the sliding ring hinged to the middle of the arc-shaped rods; the drive assembly is also provided with a transmission assembly for driving the sliding ring to move.

[0020] Beneficial effects: The linkage mechanism converts the axial displacement of the sliding ring into the radial clamping force of the arc-shaped rod, driving the plugging layer to tightly seal the interface. This mechanical linkage ensures the sealing of the interface during flow rate adjustment, reduces the lag of manual operation, prevents blood leakage, and improves the airtightness of the blood collection process.

[0021] Furthermore, the transmission assembly includes a housing fixedly connected to a fixed disk, a lead screw rotatably fitted on the inner wall of the housing, and the lead screw and gear being coaxially and fixedly connected; a nut seat is threaded onto the lead screw, and a transmission rod is fixedly connected to the bottom of the nut seat; the bottom of the housing has an opening for the transmission rod to slide; a sliding rod is fixedly connected to the end of the transmission rod away from the nut seat, the sliding rod slidingly fits against the side wall of the inflow pipe, and the end of the sliding rod away from the transmission rod is fixedly connected to a sliding ring.

[0022] Beneficial effects: By utilizing a lead screw and nut pair to convert the rotational motion of the gears into the linear displacement of the sliding ring, a single power source can simultaneously drive flow rate regulation and interface sealing. This linkage design ensures the synchronization of mechanical actions, resulting in a compact structure and smooth transmission. It avoids the risk of blood leakage due to asynchronous operation, thus improving the overall reliability of the device.

[0023] Furthermore, the sealing assembly also includes a piston cylinder fixedly connected to the outer wall of the inflow pipe, a piston plate slidably fitted on the inner wall of the piston cylinder, a piston rod fixedly connected to the piston plate, and the end of the piston rod away from the piston plate being fixedly connected to the transmission rod; the side of the piston cylinder away from the transmission rod is connected to a suction pipe, and the end of the suction pipe away from the piston cylinder is connected to an adsorption layer, and the adsorption layer has several adsorption holes along its circumference.

[0024] Beneficial effects: The piston plate reciprocates using a transmission rod, generating negative pressure within the piston cylinder. This negative pressure is transmitted through the suction tube to the adsorption layer, where it tightly adheres to and secures the connectors through the adsorption holes. This design ensures a stable connection, preventing tubing detachment or loosening due to blood flow impact, thus improving the safety of the dialysis connection.

[0025] Furthermore, a transmission pipe is connected to the side of the piston cylinder away from the suction pipe, and an expansion layer is connected to the end of the transmission pipe away from the piston cylinder. The expansion layer is located at the connection between the blocking layer and the arc-shaped rod.

[0026] Beneficial effects: Utilizing the positive pressure generated by the reciprocating motion of the piston, fluid is injected into the expansion layer through the transmission pipe, causing it to elastically deform at the connection between the blocking layer and the arc-shaped rod, filling the gap. This dual-sealing mechanism further eliminates the risk of leakage at the interface, compensates for gaps caused by pipeline vibration, and achieves a seal at the device connection interface.

[0027] Furthermore, the valve assembly includes a push rod fixedly connected to the top of the buffer core, and a valve body is also provided on the communication path between the infusion pipe and the transparent chamber. The valve body is fixedly connected to the top wall of the transparent chamber, and several outflow holes are opened along its circumference. Each outflow hole is provided with a one-way valve. A valve plate is fixedly connected to the top of the push rod through the valve body. The valve plate slides in fit with both the valve body and the inner wall of the infusion pipe. Several through holes are opened on the valve plate.

[0028] Beneficial effects: By utilizing the displacement of the buffer core to drive the push rod and valve plate to slide within the valve body, the flow rate of the anticoagulant infusion opening can be adjusted by changing the overlapping area of ​​the valve plate and the valve body's outflow orifice. Dosage matching can be achieved without additional electronic control components, and the compact structure ensures high reliability, thereby avoiding the risk of coagulation or bleeding caused by fluctuations in anticoagulant concentration.

[0029] Furthermore, a sealing ring is fixedly connected at the connection between the push rod and the valve body.

[0030] Beneficial effects: By adding a sealing ring at the connection between the push rod and the valve body, the sealing effect can prevent the anticoagulant from leaking along the gaps in the push rod, ensuring the accuracy of the anticoagulant output dosage, and reducing the entry of tiny debris generated by mechanical friction into the blood circuit, further improving the safety of clinical use.

[0031] Furthermore, the outer wall of the transparent cabin is marked with scale markings.

[0032] Beneficial effects: The graduated markings provide an intuitive reference for liquid level, enabling monitoring of the displacement of the buffer core within the transparent chamber. Medical staff can determine the current blood flow rate simply by observing the suspension height of the buffer core, without the need for additional instruments. They can also directly observe the anticoagulant infusion volume and its mixing with the blood, facilitating timely detection of issues such as tubing clotting and abnormal flow rates, thus improving clinical operational efficiency and troubleshooting speed. Attached Figure Description

[0033] Figure 1 This is an isometric view of the blood collection device for hemodialysis nursing of the present invention.

[0034] Figure 2 This is a side sectional view of the piston cylinder in the blood collection device for hemodialysis nursing of the present invention.

[0035] Figure 3 For the present invention Figure 2 Isometric view of the installation of the intermediate gear.

[0036] Figure 4 For the present invention Figure 3 Axonometric view of the middle sliding block.

[0037] Figure 5 For the present invention Figure 3 Axonometric view of the rotating disk.

[0038] Figure 6 For the present invention Figure 2 Enlarged view of section A.

[0039] Figure 7 For the present invention Figure 2 Enlarged view of section B.

[0040] Figure 8 For the present invention Figure 3 Enlarged view of section C.

[0041] The reference numerals in the accompanying drawings of the instruction manual include: 1. Transparent chamber; 2. Buffer core; 3. Inflow pipe; 4. Outflow pipe; 5. Infusion pipe; 6. Fixed plate; 7. Locking rod; 8. Sliding block; 9. Rotating ring; 10. Locking block; 11. Closing layer; 12. Driving component; 13. Gear; 14. Arc rack; 15. Blocking layer; 16. Arc rod; 17. Sliding ring; 18. Connecting rod; 19. Housing; 20. Lead screw; 21. Nut seat; 22. Transmission rod; 23. Sliding rod; 24. Piston cylinder; 25. Piston plate; 26. Piston rod; 27. Expansion layer; 28. Top rod; 29. ​​Valve body; 30. Valve plate; 31. Sealing ring. Detailed Implementation

[0042] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] The following detailed description illustrates the specific implementation method:

[0046] Example 1:

[0047] As attached Figures 1-8The image shows a blood collection device for hemodialysis care, comprising a transparent chamber 1, a buffer core 2 slidably fitted inside the transparent chamber 1, an inflow tube 3, an outflow tube 4, and an infusion tube 5 for delivering anticoagulants. The end of the inflow tube 3 furthest from the transparent chamber 1 has an integrally formed interface. When blood flows through the transparent chamber 1, the buffer core 2 is suspended within it. In this embodiment, the transparent chamber 1 is made of medical-grade transparent rigid plastic; the buffer core 2 is a hollow, lightweight, flexible float (such as a medical-grade thermoplastic elastomer) with a density slightly greater than blood. Its interior is filled with an inert gas or lightweight material to allow it to suspend in the blood.

[0048] The outside of the transparent chamber 1 is equipped with an adjustment component for adjusting the blood flow rate and a sealing component for sealing the interface; the buffer core 2 is equipped with a valve component for adjusting the opening of the infusion tube 5; the adjustment component is used to drive the sealing component and the valve component to operate synchronously, so as to seal the interface when adjusting the blood flow rate and simultaneously adjust the opening of the anticoagulant delivery volume.

[0049] Combination Figure 4 As shown, the adjustment assembly includes a fixed plate 6 that is fixedly connected to the outer wall of the transparent cabin 1 by screws. The fixed plate 6 has several inclined grooves around its circumference. Each inclined groove has a locking rod 7 that is slidably fitted on its inner wall. Each locking rod 7 has a sliding block 8 integrally formed on its sliding rod. The fixed plate 6 also has a rotating ring 9 that is rotatably fitted on its rotating ring 9. The rotating ring 9 has regular polygonal grooves.

[0050] Combination Figure 5 As shown, a locking block 10 is integrally formed at the end of the sliding block 8 away from the locking rod 7. All locking blocks 10 are located within regular polygonal grooves and slide against the inner wall of the grooves. A closing layer 11 is also provided at the connection between the inflow pipe 3 and the transparent chamber 1, and the sliding block 8 abuts against the closing layer 11. The fixed disk 6 is provided with a drive assembly for rotating the rotating ring 9. In this embodiment, the closing layer 11 is made of an elastic material, allowing the sliding block 8 to close the closing layer 11 during movement, and automatically reset during resetting using its elastic properties, thereby adjusting the size of the connecting cross-section of the inflow pipe 3.

[0051] The drive assembly includes a drive component 12 that is fixedly connected to the outer wall of the transparent cabin 1 with screws, and the drive component 12 is electrically connected to a controller; in this embodiment, the drive component 12 is a servo motor; the output shaft of the drive component 12 is coaxially fixedly connected to a gear 13, the gear 13 meshes with an arc-shaped rack 14, and the arc-shaped rack 14 is fixedly connected to the outer wall of the rotating ring 9 with screws.

[0052] The sealing assembly includes a plugging layer 15 fixedly bonded to the outer wall of the interface. In this embodiment, the plugging layer 15 is made of a flexible damping material. Several arc-shaped rods 16 are circumferentially hinged to the outer wall of the inflow pipe 3. The ends of the arc-shaped rods 16 away from the outer wall of the inflow pipe 3 abut against the outer wall of the plugging layer 15. A sliding ring 17 is also slidably fitted to the side wall of the inflow pipe 3. Several connecting rods 18 are circumferentially hinged to the outer wall of the sliding ring 17. The ends of the connecting rods 18 away from the sliding ring 17 are hinged to the middle of the arc-shaped rods 16. The drive assembly is also provided with a transmission assembly for driving the sliding ring 17 to move.

[0053] The transmission assembly includes a housing 19 screwed to a fixed plate 6, a lead screw 20 rotatably fitted on the inner wall of the housing 19, and a keyed connection between the lead screw 20 and a gear 13 coaxially; a nut seat 21 (e.g., ...) is threaded onto the lead screw 20. Figure 8 As shown), a transmission rod 22 is fixedly connected to the bottom of the nut seat 21 by screws, and the bottom of the housing 19 has an opening for the transmission rod 22 to slide; a sliding rod 23 is fixedly connected to the end of the transmission rod 22 away from the nut seat 21 by screws, the sliding rod 23 slides with the side wall of the inflow pipe 3, and the end of the sliding rod 23 away from the transmission rod 22 is fixedly connected to the sliding ring 17 by screws.

[0054] In this embodiment, the design of the movable port provides a limit for the transmission rod 22, ensuring that the transmission rod 22 always moves linearly along the axial direction, thereby maintaining the linear movement trajectory of the nut seat 21. In some preferred embodiments, a limiting rod can be added to the outer wall of the nut seat 21, and a sliding groove that slides with the limiting rod can be opened on the side wall of the housing 19, thereby further ensuring the stability of the linear movement of the nut seat 21.

[0055] Combination Figure 6 As shown, the sealing assembly also includes a piston cylinder 24 screwed to the outer wall of the inflow pipe 3. A piston plate 25 is slidably fitted onto the inner wall of the piston cylinder 24. A piston rod 26 is screwed to the piston plate 25. The end of the piston rod 26 away from the piston plate 25 is screwed to the transmission rod 22. A suction pipe is connected to the side of the piston cylinder 24 away from the transmission rod 22. An adsorption layer is connected to the end of the suction pipe away from the piston cylinder 24. The adsorption layer has several adsorption holes along its circumference. In this embodiment, the adsorption layer is located at the connection point of the interface, so that the adsorption holes can generate a negative pressure with the external connector when the inflow pipe 3 is connected, thereby generating an adsorption force to attract the external component.

[0056] The piston cylinder 24 is connected to a transmission pipe on the side away from the suction pipe. The end of the transmission pipe away from the piston cylinder 24 is connected to an expansion layer 27. The expansion layer 27 is located at the connection between the blocking layer 15 and the arc-shaped rod 16. In this embodiment, the expansion layer 27 is an airbag.

[0057] Combination Figure 7As shown, the valve assembly includes a push rod 28 fixedly connected to the top of the buffer core 2 with screws. A valve body 29 is also provided on the communication path between the infusion pipe 5 and the transparent chamber 1. The valve body 29 is fixedly connected to the inner top wall of the transparent chamber 1 with screws. The valve body 29 has several outflow holes along its circumference, and each outflow hole is provided with a one-way valve. The top of the push rod 28 passes through the valve body 29 and is fixedly connected to a valve plate 30 with screws. The valve plate 30 is in sliding fit with both the valve body 29 and the inner wall of the infusion pipe 5. Several through holes are opened on the valve plate 30.

[0058] The specific implementation process is as follows: During operation, medical staff align the interface with the collection channel interface, such as a puncture needle or dialysis tubing interface, and connect the external collection device to the outflow tube 4 to establish a tubing connection channel; the controller starts the drive component 12, and its output shaft begins to rotate, driving the gear 13, which is coaxially fixed to it, to rotate. The rotational motion of the gear 13 is transmitted to the arc-shaped rack 14 that meshes with it. Since the arc-shaped rack 14 is fixedly connected to the outer wall of the rotating ring 9 by screws, the rotating ring 9 begins to rotate around the transparent chamber 1 on the fixed plate 6.

[0059] The inner wall of the rotating ring 9 has a regular polygonal groove, and a locking block 10 slides within the groove. When the rotating ring 9 rotates, the inner wall of the regular polygonal groove pushes the locking block 10 to move along the groove's trajectory. The locking block 10 is integrally formed with the sliding block 8, and the locking rod 7, integrally formed at the other end of the sliding block 8, is inserted into an inclined groove on the fixed plate 6. Guided by the inclined groove, the locking rod 7 slides along the inclined groove, thereby causing the sliding block 8 to slide within the regular polygonal groove. When multiple sliding blocks 8 slide simultaneously, they will move towards or away from each other towards the center of the inflow pipe 3.

[0060] Because the inner end of the sliding block 8 abuts against the closing layer 11, which is made of elastic material and located at the connection between the inflow pipe 3 and the transparent chamber 1, the sliding blocks 8 push towards the center, compressing the closing layer 11 and causing it to bulge inward, gradually reducing the flow cross-section of the inflow pipe 3. The greater the distance the sliding blocks 8 move, the higher the closing layer 11 bulges, resulting in a smaller flow cross-section and thus reducing the blood collection flow rate; conversely, a shorter movement increases the flow rate.

[0061] Meanwhile, the lead screw 20, coaxially fixed to the gear 13, rotates together with the gear 13. The lead screw 20 is threadedly engaged with the nut seat 21, and the rotational motion of the lead screw 20 drives the nut seat 21 to move linearly along the axial direction of the lead screw 20. The transmission rod 22, connected to the bottom of the nut seat 21, slides in the movable opening at the bottom of the housing 19. The movable opening provides guidance for the transmission rod 22, ensuring that it always maintains a linear motion trajectory. Since the end of the transmission rod 22 away from the nut seat 21 is connected to the sliding rod 23, and the sliding rod 23 is in sliding engagement with the side wall of the inflow pipe 3, the movement of the transmission rod 22 drives the sliding rod 23 to move synchronously.

[0062] The other end of the sliding rod 23 is fixedly connected to the sliding ring 17 with a screw, pulling the sliding ring 17 to slide along the outer wall of the inflow pipe 3 towards the interface. Several connecting rods 18 are circumferentially hinged to the outer wall of the sliding ring 17, with the other end of each connecting rod 18 hinged to the middle of the arc-shaped rod 16, one end of which is hinged to the outer wall of the inflow pipe 3. When the sliding ring 17 moves towards the interface, the connecting rods 18 pull the arc-shaped rod 16 to swing around its hinge point, and the end of the arc-shaped rod 16 gradually approaches the interface and compresses the blocking layer 15. Because the blocking layer 15 is made of flexible damping material and is fixedly bonded to the outer wall of the interface, the blocking layer 15 deforms under the compression of the arc-shaped rod 16, tightly adhering to the outer wall of the interface, forming a preliminary seal.

[0063] Simultaneously, the movement of the transmission rod 22 also drives the piston rod 26, which is fixed to it, to move. The other end of the piston rod 26 is connected to the piston plate 25, which slides on the inner wall of the piston cylinder 24. When the transmission rod 22 drives the piston rod 26 to move away from the interface, the piston plate 25 moves backward within the piston cylinder 24, creating a negative pressure in the front cavity of the piston cylinder 24. This negative pressure is transmitted to the adsorption layer through the suction tube. The adsorption layer has several adsorption holes circumferentially arranged at the connection points of the interface. The negative pressure causes the adsorption holes to generate suction, adsorbing and fixing external connectors such as dialysis tubing fittings.

[0064] Meanwhile, the volume of the cavity at the rear end of the piston cylinder 24 decreases due to the rearward movement of the piston plate 25, and the internal air is gradually compressed and forced into the expansion layer 27 through the transmission pipe. Since the expansion layer 27 is an air bladder, it is located at the connection between the blocking layer 15 and the arc-shaped rod 16. After being inflated, it expands and further compresses the blocking layer 15 from the outside, making it fit more tightly with the interface, thereby forming a double seal.

[0065] While flow rate regulation and interface sealing are in progress, blood begins to enter the transparent chamber 1 from the inlet tube 3. After the blood flows in, the buffer core 2 is suspended in the blood. When the flow rate decreases due to the protrusion of the closure layer 11, the buffer core 2 gradually descends under the action of gravity. As the buffer core 2 descends, the push rod 28 drives the valve plate 30 to move downward, causing the valve plate 30 to gradually block the outflow hole on the valve body 29, thereby reducing the flow area and thus reducing the opening of the infusion tube 5, reducing the amount of anticoagulant delivered. Conversely, if medical personnel need to increase the flow rate, they can control the motor to reverse, the sliding block 8 to move outward, and the closure layer 11 to return to its elastic state, increasing the flow cross-section and increasing the flow rate. After the flow rate increases, the impact force of the blood on the buffer core 2 increases, pushing the buffer core 2 upward. The push rod 28 drives the valve plate 30 to move upward, causing the valve plate 30 to gradually give way to the outflow hole position, thereby increasing the flow area and increasing the opening of the infusion tube 5, and the amount of anticoagulant delivered increases simultaneously.

[0066] This embodiment utilizes a single drive source, a servo motor, to simultaneously drive the adjustment, sealing, and valve components, achieving mechanical linkage for blood flow rate regulation, interface sealing, and anticoagulant infusion. Healthcare professionals only need to control the motor's rotation to automatically complete these three key operations, eliminating the need for manual intervention, simplifying the process, and improving nursing efficiency and safety. This highly integrated linkage design not only reduces control lag caused by multiple power sources but also ensures that sealing and anticoagulation safety respond instantly at critical moments of blood flow regulation, enhancing the safety and operational efficiency of hemodialysis care.

[0067] Example 2:

[0068] As attached Figure 7 As shown, the difference from Embodiment 1 is that a sealing ring 31 is also fixedly bonded to the connection between the top rod 28 and the valve body 29.

[0069] The specific implementation process is as follows: When the drive assembly drives the push rod 28 to slide axially within the valve body 29 to adjust the anticoagulant flow rate, the sealing ring 31, which is fixedly bonded to the connection between the push rod 28 and the valve body 29, comes into play. With the reciprocating motion of the push rod 28, the sealing ring 31 tightly fits the mating surface, forming a reliable sealing barrier. It can block the path of leakage of the anticoagulant solution along the axial gap of the push rod 28, ensuring the accuracy of the infusion dosage.

[0070] Example 3:

[0071] The difference from Embodiment 2 is that the outer wall of the transparent cabin 1 is also marked with scale markings.

[0072] The specific implementation process is as follows: As blood flows in, the buffer core 2 rises and falls with the liquid level inside the chamber. The top rod 28 synchronously adjusts the opening of the anticoagulant infusion valve, achieving adaptive matching between the anticoagulant and the flow rate. Medical staff can directly read the real-time blood volume corresponding to the height of the buffer core 2 through the scale markings on the outer wall of the transparent chamber 1, eliminating the need for electronic monitoring and improving the safety and accuracy of hemodialysis blood collection. Furthermore, the scale markings on the outer wall of the transparent chamber 1 provide medical staff with an intuitive liquid level reference, enabling them to quantitatively monitor the liquid volume inside the transparent chamber 1 and the displacement of the buffer core 2 in real time.

[0073] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A blood collection device for hemodialysis care, comprising a transparent capsule (1), characterized in that, A buffer core (2) is slidably fitted inside the transparent chamber (1). The transparent chamber (1) is connected to an inflow pipe (3), an outflow pipe (4), and an infusion pipe (5) for delivering anticoagulants. An interface is fixedly connected to one end of the inflow pipe (3) away from the transparent chamber (1). When blood flows through the transparent chamber (1), the buffer core (2) is suspended inside the transparent chamber (1). The transparent chamber (1) is equipped with an adjustment component for adjusting the blood flow rate and a sealing component for sealing the interface; the buffer core (2) is equipped with a valve component for adjusting the opening of the infusion tube (5); the adjustment component is used to drive the sealing component and the valve component to operate synchronously, so as to seal the interface when adjusting the blood flow rate and simultaneously adjust the opening of the anticoagulant delivery volume.

2. The blood collection device for hemodialysis nursing according to claim 1, characterized in that, The adjustment assembly includes a fixed plate (6) fixedly connected to the outer wall of the transparent cabin (1). The fixed plate (6) has several inclined grooves in its circumference. The inner wall of each inclined groove is slidably fitted with a locking rod (7). Each locking rod (7) is fixedly connected with a sliding block (8). The fixed plate (6) is also rotatably fitted with a rotating ring (9). The rotating ring (9) has regular polygonal grooves. The sliding block (8) is fixedly connected to a locking block (10) at the end away from the locking rod (7). The locking blocks (10) are all located in the regular polygonal groove, and the locking blocks (10) slide in cooperation with the inner wall of the regular polygonal groove. A closing layer (11) is also provided at the connection between the inflow pipe (3) and the transparent cabin (1). The sliding block (8) abuts against the closing layer (11). A drive assembly for driving the rotating ring (9) to rotate is provided on the fixed plate (6).

3. The blood collection device for hemodialysis nursing according to claim 2, characterized in that, The drive assembly includes a drive unit (12) fixedly connected to the outer wall of the transparent cabin (1), and the drive unit (12) is electrically connected to a controller; the output shaft of the drive unit (12) is coaxially fixedly connected to a gear (13), the gear (13) meshes with an arc rack (14), and the arc rack (14) is fixedly connected to the outer wall of the rotating ring (9).

4. The blood collection device for hemodialysis nursing according to claim 3, characterized in that, The sealing assembly includes a plugging layer (15) fixedly connected to the outer wall of the interface, and several arc-shaped rods (16) are circumferentially hinged to the outer wall of the inflow pipe (3). The ends of the arc-shaped rods (16) away from the outer wall of the inflow pipe (3) are all in contact with the outer wall of the plugging layer (15). The side wall of the inflow pipe (3) is also slidably fitted with a sliding ring (17). Several connecting rods (18) are circumferentially hinged to the outer wall of the sliding ring (17). The ends of the connecting rods (18) away from the sliding ring (17) are all hinged to the arc-shaped rods (16). The drive assembly is also provided with a transmission assembly for driving the sliding ring (17) to move.

5. The blood collection device for hemodialysis nursing according to claim 4, characterized in that, The transmission assembly includes a housing (19) fixedly connected to a fixed disk (6), a lead screw (20) rotatably fitted on the inner wall of the housing (19), the lead screw (20) being coaxially fixedly connected to a gear (13); a nut seat (21) is threaded onto the lead screw (20), a transmission rod (22) is fixedly connected to the bottom of the nut seat (21), and an opening for the transmission rod (22) to slide is opened at the bottom of the housing (19); a sliding rod (23) is fixedly connected to the end of the transmission rod (22) away from the nut seat (21), the sliding rod (23) is slidably fitted with the side wall of the inflow pipe (3), and the end of the sliding rod (23) away from the transmission rod (22) is fixedly connected to a sliding ring (17).

6. The blood collection device for hemodialysis nursing according to claim 5, characterized in that, The sealing assembly also includes a piston cylinder (24) fixedly connected to the outer wall of the inflow pipe (3). A piston plate (25) is slidably fitted on the inner wall of the piston cylinder (24). A piston rod (26) is fixedly connected to the piston plate (25). The end of the piston rod (26) away from the piston plate (25) is fixedly connected to the transmission rod (22). A suction pipe is connected to the side of the piston cylinder (24) away from the transmission rod (22). An adsorption layer is connected to the end of the suction pipe away from the piston cylinder (24). The adsorption layer has several adsorption holes along its circumference.

7. The blood collection device for hemodialysis nursing according to claim 6, characterized in that, The piston cylinder (24) is connected to a transmission pipe on the side away from the suction pipe. The end of the transmission pipe away from the piston cylinder (24) is connected to an expansion layer (27). The expansion layer (27) is located at the connection between the blocking layer (15) and the arc rod (16).

8. The blood collection device for hemodialysis nursing according to claim 7, characterized in that, The valve assembly includes a top rod (28) fixedly connected to the top of the buffer core (2), and a valve body (29) is provided on the communication path between the infusion pipe (5) and the transparent chamber (1). The valve body (29) is fixedly connected to the inner top wall of the transparent chamber (1). The valve body (29) has several outflow holes along its circumference, and each outflow hole is provided with a one-way valve. The top of the top rod (28) passes through the valve body (29) and is fixedly connected to a valve plate (30). The valve plate (30) slides with the valve body (29) and the inner wall of the infusion pipe (5). The valve plate (30) has several through holes.

9. The blood collection device for hemodialysis nursing according to claim 8, characterized in that, A sealing ring (31) is also fixedly connected at the connection between the push rod (28) and the valve body (29).

10. The blood collection device for hemodialysis nursing according to claim 9, characterized in that, The outer wall of the transparent cabin (1) is also marked with scale markings.

Images