Blood sampling device for an arterial catheter

Abstract

This utility model belongs to the field of medical device technology, and specifically relates to a blood collection device for arterial catheters. It includes a blood collection end, a monitoring end, and a flushing end, which are connected by a three-way valve. The blood collection end is equipped with a collection device, which includes a blood collection channel and a blood collection needle. The blood collection channel includes a first channel near the blood collection end and a second channel near the blood collection needle. A waste fluid collection area is provided between the first and second channels. A rotary adjustment structure is also provided within the first channel. Initially, the first channel is connected to the waste fluid collection area; during blood collection, the first channel is connected to the second channel. By utilizing the waste fluid collection area and the rotary adjustment structure within the blood collection channel to switch the connection state between the first and second channels, the problem of inconvenient waste fluid separation and cumbersome blood collection operations in existing arterial blood collection processes is solved, improving the accuracy of blood sample collection and the operational efficiency of the blood collection process.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically a blood collection device for arterial catheters. Background Technology

[0002] Invasive arterial blood gas analysis is an important clinical test for assessing patients’ respiratory function, oxygenation status and acid-base balance. It is widely used in intensive care, perioperative management of anesthesia and emergency treatment of critically ill patients. In actual clinical practice, an arterial catheter is usually inserted into the radial artery, femoral artery, or brachial artery of the patient to establish a continuous arterial blood access. The arterial catheter is connected to a pressure monitoring system, a flushing line, and a blood collection port through a three-way valve, thus forming an arterial access system that integrates arterial pressure monitoring, catheter flushing, and blood sample collection. During blood collection, medical staff need to switch the three-way valve access state to allow arterial blood to flow to the blood collection end, thereby completing the blood sample collection. In existing technologies, in long-term indwelling arterial catheter systems, in order to maintain catheter patency, flushing fluids such as heparinized saline are usually continuously or intermittently injected into the catheter through the flushing end. Therefore, at the beginning of blood collection, there is often a certain amount of flushing fluid or a mixture of flushing fluid and blood remaining in the catheter. In order to avoid this mixture affecting the test results, medical staff usually need to draw the first tube of blood and discard it directly, and then collect the second tube of blood as a test sample. Therefore, how to provide a blood collection structure that can collect or divert the initial mixture during the blood collection process and allow the blood to automatically enter the blood collection pathway for normal collection after the mixture is discharged, so as to reduce the amount of waste blood in the first tube and improve the efficiency of the blood collection operation, is a technical problem that urgently needs to be solved in the existing technology. Utility Model Content

[0003] The purpose of this invention is to address the problem in the existing technology of how to provide a blood collection structure that can collect or divert the initial mixture during blood collection and allow the blood to automatically enter the blood collection pathway for normal collection after the mixture is discharged, so as to reduce the amount of blood wasted in the first tube and improve the efficiency of blood collection operation, and to provide a blood collection device for arterial catheters.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A blood collection device for an arterial catheter includes a blood collection end, a monitoring end, and a flushing end. The blood collection end, the monitoring end, and the flushing end are connected by a three-way valve. The flushing end is used to connect to the arterial catheter, the monitoring end is used to connect to a human artery, and the blood collection end is equipped with a collection device. The collection device includes a blood collection channel and a blood collection needle. One end of the blood collection channel is connected to the blood collection end, and the other end is connected to the blood collection needle. The blood collection channel includes a first channel near the blood collection end and a second channel near the blood collection needle. A waste liquid collection area is provided between the first channel and the second channel. A one-way valve is provided between the waste liquid collection area and the first channel. A rotary adjustment structure is also provided in the first channel. In the initial state, the first channel is connected to the waste liquid collection area. In the blood collection state, the first channel is connected to the second channel.

[0005] Preferably, the waste liquid collection area is a variable volume cavity and maintains a gap with the inner wall of the blood collection channel.

[0006] Preferably, the rotation adjustment structure is located in the first channel near the blood collection end, and the diameter of the rotation adjustment structure matches the inner diameter of the blood collection channel.

[0007] Preferably, the rotary adjustment structure includes an inner adjustment ring, an outer adjustment ring, and a baffle. The inner adjustment ring is connected to the first channel, and the outer adjustment ring is connected to the second channel. By rotating the rotary adjustment structure, the baffle changes the connection state between the first channel and the second channel, thereby achieving the switching of opening and closing of the two channels.

[0008] Preferably, the cross-sectional area of ​​the first channel is larger than the cross-sectional area of ​​the second channel.

[0009] Preferably, the tip of the blood collection needle is blunt.

[0010] Preferably, a rubber piston is provided on the outer periphery of the blood collection needle.

[0011] Preferably, when the collection device is separated from the blood collection end, a protective sleeve is provided on the outside of the collection device, which is used to wrap and protect the connector and the blood collection needle.

[0012] Preferably, a connector is provided between the blood collection channel and the blood collection end, and the connector and the blood collection end are detachably connected.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. The blood collection channel of this utility model is equipped with a waste liquid collection area and a rotary adjustment structure, so that the blood in the arterial catheter can be guided into the waste liquid collection area for collection in the early stage of collection. After the waste liquid is collected, the connection state between the first channel and the second channel is switched by the rotary adjustment structure, so that the blood can directly enter the blood collection needle for collection. This avoids the mixed liquid entering the blood collection needle in the early stage of blood collection and affecting the blood sample quality. At the same time, it reduces the additional waste liquid collection steps, solves the problems of inconvenient waste liquid separation and cumbersome blood collection operation in the existing arterial blood collection process, and improves the accuracy of blood sample collection and the operation efficiency of the blood collection process.

[0014] 2. The rotary adjustment structure of this utility model includes an inner adjustment ring, an outer adjustment ring, and a baffle structure, and makes the flow cross-sectional area of ​​the first channel larger than that of the second channel. This allows blood to stably enter the waste liquid collection area for mixed liquid collection in the initial stage of blood collection, and a stable blood collection flow path can be formed through channel switching during the blood collection stage. This achieves reliable opening and closing of the blood collection channel and flow regulation, further improving the stability of the blood flow process and the reliability of blood sample collection.

[0015] 3. The blood collection needle of this utility model adopts a blunt tip structure, and a rubber piston is set on the outer periphery of the blood collection needle and a protective sleeve is set in the disassembled state of the collection device. This forms multiple protections for the blood collection needle and the connecting parts, making the blood collection needle less likely to be exposed during operation, replacement and non-working states. This effectively reduces the risk of needlestick injury to medical staff and reduces the possibility of blood contamination. While meeting the blood collection function, it further improves the clinical safety of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a blood collection device used in arterial catheters; Figure 2 This is a partial structural diagram of a blood collection device for arterial catheters; Figure 3 This is a partial cross-sectional structural diagram of the acquisition device; Figure 4 This is a schematic diagram of the rotation adjustment structure. Figure 5 This is a schematic diagram of the acquisition device.

[0017] The markings in the diagram are: 1-blood collection end, 2-monitoring end, 3-rinsing end, 4-three-way valve, 5-collection device, 6-blood collection needle, 7-blood collection channel, 8-first channel, 9-second channel, 10-waste collection area, 11-one-way valve, 12-rotary adjustment structure, 13-inner adjustment ring, 14-outer adjustment ring, 15-baffle, 16-rubber piston, 17-protective sleeve, 18-connector. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings.

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0020] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0021] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In Example 1: Figures 1 to 5As shown, the present invention describes a blood collection device for an arterial catheter, comprising a blood collection end 1, a monitoring end 2, and a flushing end 3. The blood collection end 1, the monitoring end 2, and the flushing end 3 are connected by a three-way valve 4. The flushing end 3 is used to connect to the arterial catheter, the monitoring end 2 is used to connect to a human artery, and the blood collection end 1 is provided with a collection device 5. The collection device 5 includes a blood collection channel 7 and a blood collection needle 6. One end of the blood collection channel 7 is connected to the blood collection end 1, and the other end is connected to the blood collection needle 6. The blood collection channel 7 includes a first channel 8 near the blood collection end 1 and a second channel 9 near the blood collection needle 6. A waste liquid collection area 10 is provided between the first channel 8 and the second channel 9. A one-way valve 11 is provided between the waste liquid collection area 10 and the first channel 8. A rotary adjustment structure 12 is also provided in the first channel 8. In the initial state, the first channel 8 is connected to the waste liquid collection area 10. In the blood collection state, the first channel 8 is connected to the second channel 9.

[0025] In this embodiment, the flushing end 3 is connected to the arterial catheter. Blood in the human artery enters the three-way valve 4 through the arterial catheter under the action of arterial pressure, and enters the blood collection channel 7 through the blood collection end 1. When the device is in the initial state, the rotary adjustment structure 12 keeps the first channel 8 connected to the waste liquid collection area 10. At this time, the blood in the first channel 8 enters the waste liquid collection area 10 through the one-way valve 11 under the action of arterial pressure, so that the mixed liquid generated in the early stage of blood collection is guided into the waste liquid collection area 10 for collection, avoiding this part of the mixed liquid from directly entering the blood collection needle 6. After the waste liquid is collected, the rotary adjustment structure 12 is adjusted to connect the first channel 8 with the second channel 9, and at the same time closes the passage between the first channel 8 and the waste liquid collection area 10. At this time, the blood from the arterial catheter continues to enter the first channel 8 through the three-way valve 4, and flows from the first channel 8 to the second channel 9, and then enters the blood collection needle 6 through the second channel 9. The blood collection needle 6 is connected to the collection tube to realize blood collection. By setting the waste fluid collection area 10 and the rotation adjustment structure 12 in the blood collection channel 7, the blood in the arterial catheter can be guided into the waste fluid collection area 10 for collection in the initial stage of collection, thereby avoiding the initial mixed liquid from entering the blood collection needle 6 and affecting the blood sample quality. At the same time, it can effectively reduce the cost of the collection tube. After the waste fluid is collected, the rotation adjustment structure 12 changes the connection between the first channel 8 and the second channel 9, so that the blood can flow directly from the first channel 8 to the second channel 9 and enter the blood collection needle 6, thereby achieving stable blood collection and further improving the accuracy of blood sample collection. At the same time, it can also reduce the operation steps of medical staff in the blood collection process and improve the safety and convenience of clinical use.

[0026] As a preferred embodiment, based on the above method, the waste liquid collection area 10 is further configured as a variable volume cavity, maintaining a gap with the inner wall of the blood collection channel 7. With this structural arrangement, a flow guiding space is formed between the waste liquid collection area 10 and the blood collection channel 7, allowing the liquid in the first channel 8 to smoothly enter the waste liquid collection area 10 for collection. This avoids liquid flow obstruction caused by structural fit. As the liquid gradually enters and is collected in the waste liquid collection area 10, the volume of the waste liquid collection area 10 can change accordingly, achieving temporary storage of the mixed liquid in the initial stage of blood collection. This is beneficial for improving the collection efficiency of the mixed liquid in the initial stage of blood collection. Simultaneously, it can maintain a stable flow state inside the blood collection channel 7, further improving the stability and reliability of the blood collection process.

[0027] As a preferred embodiment, based on the above method, the rotation adjustment structure 12 is further disposed in the first channel 8 near the blood collection end 1, and the diameter of the rotation adjustment structure 12 matches the inner diameter of the blood collection channel 7. With this structural arrangement, the rotation adjustment structure 12 is disposed in the first channel 8 near the blood collection end 1 and inside the blood collection channel 7. The outer diameter of the rotation adjustment structure 12 matches the inner diameter of the blood collection channel 7, allowing the rotation adjustment structure 12 to be stably installed within the blood collection channel 7 and to be rotated and adjusted within the blood collection channel 7. This maintains good sealing and structural stability during rotation adjustment, enabling reliable switching between the first channel 8 and the waste liquid collection area 10, and between the first channel 8 and the second channel 9, while maintaining good sealing, thereby ensuring a stable blood flow path.

[0028] In Example 2: Figures 1 to 5As shown, the present invention describes a blood collection device for arterial catheters. Based on the above method, the rotating adjustment structure 12 further includes an inner adjustment ring 13, an outer adjustment ring 14, and a baffle 15. The inner adjustment ring 13 is connected to the first channel 8, and the outer adjustment ring 14 is connected to the second channel 9. By rotating the rotating adjustment structure 12, the baffle 15 changes the connection state between the first channel 8 and the second channel 9, thereby realizing the opening and closing switching of the two channels.

[0029] In this embodiment, the rotation adjustment structure 12 includes an inner adjustment ring 13, an outer adjustment ring 14, and a baffle 15 structure disposed on the adjustment ring. The inner adjustment ring 13 is connected to the first channel 8, and the outer adjustment ring 14 is connected to the second channel 9. The two are coaxially arranged and the position of the baffle 15 can be changed as the rotation adjustment structure 12 rotates as a whole. When the rotary adjustment structure 12 is in its initial state, the baffle 15 prevents blood in the first channel 8 from directly entering the second channel 9, instead directing it to flow through the first channel 8 to the waste liquid collection area 10, thus achieving the collection of the initial blood collection mixture. When blood collection is required, rotating the rotary adjustment structure 12 changes the position of the baffle 15, thereby opening the communication path between the first channel 8 and the second channel 9. At this time, the blood in the first channel 8 can flow directly to the second channel 9 and further enter the blood collection needle 6, thus completing blood collection. The inner adjustment ring 13 is also included in this process. The outer adjustment ring 14 and the baffle 15 structure enable the rotary adjustment structure 12 to switch the connection state between the first channel 8 and the second channel 9 through a simple rotation operation. This structure can not only block the connection path between the first channel 8 and the second channel 9 in the early stage of blood collection, allowing blood to enter the waste liquid collection area 10 for collection, but also quickly establish the connection path between the first channel 8 and the second channel 9 in the blood collection stage, allowing blood to smoothly enter the blood collection needle 6 for collection. The waste liquid collection area 10 further improves the effect of separating the mixed liquid in the early stage of blood collection and the subsequent stable blood collection.

[0030] As a preferred embodiment, based on the above method, the flow cross-sectional area of ​​the first channel 8 is further larger than that of the second channel 9. With this structural arrangement, the first channel 8, as the main guiding channel for blood after entering the blood collection channel 7, has a larger flow cross-sectional area that allows the blood to maintain a stable flow state after entering the blood collection channel 7, thus facilitating the initial collection of the mixed liquid in the waste liquid collection area 10. The second channel 9 has a relatively smaller flow cross-sectional area, allowing the blood to form a relatively stable flow velocity when entering the second channel 9 from the first channel 8 during the blood collection stage. This facilitates the smooth entry of blood into the blood collection needle 6 and its collection, further achieving a stable blood collection effect after waste liquid separation and improving the accuracy and reliability of blood sample collection.

[0031] In Example 3: such as Figures 1 to 5 As shown, the blood collection device for arterial catheters described in this utility model, based on the above-described method, further features a blunt-tipped needle 6. This blunt tip, with a conical transition end or a chamfered end, is used to engage with the elastic sealing plug of the blood collection tube, reducing the risk of needlestick injury during operation and thus improving the clinical safety of the collection device 5.

[0032] As a preferred embodiment, based on the above method, a rubber piston 16 is further provided on the outer periphery of the blood collection needle 6. With this structural arrangement, the rubber piston 16 is sleeved and fixed to the outer surface of the blood collection needle 6, so that the needle body is not directly exposed to the external environment, reducing the risk of needle puncture caused by accidental contact. At the same time, it effectively reduces the risk of blood splashing or the spread of adhering contaminants, further improving the overall safety performance. Specifically, the rubber piston 16 may be made of elastic medical rubber material or the like.

[0033] As a preferred embodiment, based on the above method, when the collection device 5 is separated from the blood collection end 1, a protective sleeve 17 is provided on the outside of the collection device 5. The protective sleeve 17 is used to wrap and protect the connector 18 and the blood collection needle 6. With this structural arrangement, when the collection device 5 is disassembled and separated from the blood collection end 1, the protective sleeve 17 is placed on the outside of the entire collection device 5. The protective sleeve 17 is cylindrical or has a shell structure, and its internal space can simultaneously accommodate the end of the connector 18 and the end of the blood collection needle 6. It can form a physical isolation and protection for the blood collection needle 6 and the connector 18 in the non-working state, preventing accidental contact injury and environmental pollution caused by the exposed blood collection needle 6, and facilitating transportation, storage and on-site replacement operations.

[0034] As a preferred embodiment, based on the above method, a connector 18 is further provided between the blood collection channel 7 and the blood collection end 1, and the connector 18 and the blood collection end 1 are detachably connected. With this structure, one end of the connector 18 is connected to the blood collection channel 7 and the other end is connected to the blood collection end 1. After the blood collection operation is completed, the connector 18 can be removed from the blood collection end 1 for easy replacement or subsequent processing, thereby improving the practicality and ease of operation of the collection device 5. Specifically, the connector 18 and the blood collection end 1 can be connected by a threaded connection, a snap-fit ​​connection, or the like.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A blood collection device for arterial catheters, characterized in that, It includes a blood collection end, a monitoring end, and a flushing end. The blood collection end, the monitoring end, and the flushing end are connected by a three-way valve. The flushing end is used to connect to an arterial catheter, the monitoring end is used to connect to a human artery, and the blood collection end is equipped with a collection device. The collection device includes a blood collection channel and a blood collection needle. One end of the blood collection channel is connected to the blood collection end, and the other end is connected to the blood collection needle. The blood collection channel includes a first channel near the blood collection end and a second channel near the blood collection needle. A waste liquid collection area is provided between the first channel and the second channel. A one-way valve is provided between the waste liquid collection area and the first channel. A rotary adjustment structure is also provided in the first channel. In the initial state, the first channel is connected to the waste liquid collection area. In the blood collection state, the first channel is connected to the second channel. By setting the waste liquid collection area and the rotary adjustment structure in the blood collection channel, the blood in the arterial catheter can be guided into the waste liquid collection area for collection in the early stage of collection, thereby avoiding the initial mixed liquid from entering the blood collection needle and affecting the blood sample quality. After the waste liquid is collected, the connection between the first channel and the second channel is changed by the rotation adjustment structure, so that the blood can flow directly from the first channel to the second channel and enter the blood collection needle, thereby achieving stable blood collection.

2. A blood collection device for an arterial catheter according to claim 1, characterized in that, The waste liquid collection area is a variable volume cavity and maintains a gap with the inner wall of the blood collection channel.

3. A blood collection device for an arterial catheter according to claim 2, characterized in that, The rotating adjustment structure is located in the first channel near the blood collection end, and the diameter of the rotating adjustment structure matches the inner diameter of the blood collection channel.

4. A blood collection device for an arterial catheter according to claim 3, characterized in that, The rotary adjustment structure includes an inner adjustment ring, an outer adjustment ring, and a baffle. The inner adjustment ring is connected to the first channel, and the outer adjustment ring is connected to the second channel. By rotating the rotary adjustment structure, the baffle changes the connection state between the first channel and the second channel, thereby achieving the switching between opening and closing of the two channels.

5. A blood collection device for an arterial catheter according to claim 4, characterized in that, The cross-sectional area of ​​the first channel is larger than that of the second channel.

6. A blood collection device for an arterial catheter according to claim 5, characterized in that, The tip of the blood collection needle is blunt.

7. A blood collection device for an arterial catheter according to claim 6, characterized in that, A rubber piston is provided on the outer periphery of the blood collection needle.

8. A blood collection device for an arterial catheter according to claim 7, characterized in that, A connector is provided between the blood collection channel and the blood collection end, and the connector and the blood collection end are detachably connected; when the collection device is separated from the blood collection end, a protective sleeve is provided on the outside of the collection device, and the protective sleeve is used to wrap and protect the connector and the blood collection needle.

Images