Blood return prevention monitoring device for PICC (peripherally inserted central catheter)

Abstract

The utility model discloses a blood return prevention monitoring device for a PICC (Peripherally Inserted Central Catheter), and belongs to the technical field of PICC. Comprising a blocking catheter, the two ends of the blocking catheter are fixedly connected with an injection connecting pipe and a catheter connecting pipe respectively, the injection connecting pipe is used for being connected with an injector, the catheter connecting pipe is used for being connected with a venous indwelling catheter, a one-way valve structure is arranged in the blocking catheter, and when blood returns to the venous indwelling catheter, reverse pressure exists in the catheter, and the blood returns to the catheter. A blocking ball is pushed by resistance of a second spring to seal an injection connecting pipe, injection one-way conduction and blood return blocking effects are formed, a piston block extrudes a first spring along an L-shaped cavity due to reverse pressure in a catheter during blood return, a push rod is forced to push a resistor block to move along a resistor disc, the actual length of the two cables electrically connected with the resistor disc is reduced, and the service life of the two cables is prolonged. The resistance monitor can monitor the blood return phenomenon of the venous indwelling catheter, and can send out a blood return alarm instruction in time to remind medical staff to deal with the blood return phenomenon in time.

Description

Technical Field

[0001] This application relates to the field of PICC catheter technology, and more specifically, to a PICC catheter backflow prevention monitoring device. Background Technology

[0002] PICC (Peripherally Inserted Central Catheter) placement is a common method of venous catheter insertion, primarily used to protect blood vessels, establish venous access, and reduce pain and infection risks. While backflow of blood into the PICC catheter generally does not harm the patient, it may promote bacterial growth and increase the risk of blood clots or infection. If backflow is detected, it should be checked for blood clots immediately, and catheter flushing and other medical procedures should be performed promptly. However, backflow can only be detected visually at intervals by caregivers, making timely detection difficult. Therefore, we propose a PICC catheter backflow prevention monitoring device. Utility Model Content

[0003] 1. Technical problems to be solved

[0004] The purpose of this application is to provide a PICC catheter backflow prevention monitoring device, which solves the technical problems in the background art mentioned above. It realizes that when there is backflow in the venous catheter, there is reverse pressure in the catheter. Due to the resistance of the second spring, the blocking ball is pushed to close the injection connection tube, forming one-way injection and blocking backflow. When there is backflow, the reverse pressure in the catheter causes the piston block to squeeze the first spring along the L-shaped cavity, and forces the push rod to push the resistor block to move along the resistor piece, reducing the actual length of the resistor piece electrically connected to the two cables. This allows the resistance monitor to detect the backflow phenomenon of the venous catheter, issue a backflow alarm command in a timely manner, and promptly remind medical staff to deal with the backflow phenomenon.

[0005] 2. Technical Solution

[0006] This application provides a PICC catheter anti-backflow monitoring device, comprising: an occlusion catheter, with an injection connection tube and a catheter connection tube fixedly connected to both ends of the occlusion catheter, the injection connection tube being used to connect a syringe, and the catheter connection tube being used to connect an intravenous catheter; a one-way valve structure is provided inside the occlusion catheter, the one-way valve structure including an occlusion ball and a second spring; an arc-shaped block is fixedly provided on the occlusion catheter, the arc-shaped block having an L-shaped cavity and a sliding cavity, and a monitoring mechanism is installed inside the arc-shaped block; the monitoring mechanism includes two cables, the cables being electrically connected to a resistor and a resistor block respectively; the resistor is fixedly provided in the sliding cavity, the resistor block being slidably provided in the sliding cavity and in contact with the resistor; a push rod is fixedly connected to the resistor block, the push rod having a first spring sleeved on its outer sleeve, and a piston block being fixedly connected to its end; the piston block being slidably provided in the L-shaped cavity, the L-shaped cavity being in communication with the catheter connection tube.

[0007] By adopting the above technical solution, the two ends of the blocking catheter are fixedly connected to an injection connection tube and a catheter connection tube, respectively. The catheter connection tube is used to connect to an intravenous catheter. The blocking catheter has a one-way valve structure composed of a blocking ball and a second spring inside, which allows the syringe to be connected to the injection connection tube for intravenous infusion therapy. At the same time, it achieves the purpose of preventing backflow of the intravenous catheter. When there is backflow of the intravenous catheter, the catheter connection tube is subjected to reverse pressure. The piston block in the L-shaped cavity forces the first spring to elastically deform, and pushes the resistor block to slide along the sliding cavity through the push rod. This reduces the actual length of the resistor piece electrically connected to the two cables. Thus, the resistance monitor connected to the cables can detect the backflow of the intravenous catheter, issue a backflow alarm command in time, and promptly remind medical staff to deal with the backflow.

[0008] Optionally, the obstruction catheter is provided with a large conical cavity and a small conical cavity, and the obstruction ball and the second spring are disposed in the large conical cavity.

[0009] By adopting the above technical solution, the second spring is set larger than the small cavity, so that the second spring will squeeze the blocking ball to seal the injection connection tube, forming a one-way valve structure.

[0010] Optionally, the connecting end face of the small cavity and the catheter connecting tube is a conical surface, and one end of the L-shaped cavity is located at the connecting end face of the small cavity and the catheter connecting tube.

[0011] By adopting the above technical solution, the connection end face between the small cavity and the catheter connection tube is a conical structure. Therefore, when the syringe is connected to the injection connection tube for intravenous infusion therapy, since one end of the L-shaped cavity is located at the connection end face between the small cavity and the catheter connection tube, the injected infusion will be directly injected into the vein in the catheter. The positive infusion pressure in the catheter has little effect on the piston block in the L-shaped cavity. When blood returns to the intravenous catheter, the reverse pressure in the catheter can easily and smoothly squeeze into the L-shaped cavity and force the piston block to slide, causing the first spring to elastically deform.

[0012] Optionally, the push rod moves through the L-shaped cavity and extends into the sliding cavity, and the first spring is located inside the L-shaped cavity.

[0013] By adopting the above technical solution, the piston block slides along the L-shaped cavity, causing the first spring to elastically deform and forcing the push rod to push the resistor block to slide along the cavity. Since one cable is connected to one end of the resistor piece and the other cable is electrically connected to the resistor block, the resistor block slides along the other end of the resistor piece. Thus, when the piston block slides, the actual stroke of the resistor piece participating in the monitoring circuit changes.

[0014] Optionally, the cable extends to the outside of the arc-shaped block and is electrically connected to the online grounding resistance monitoring instrument, with the device model being MC-04.

[0015] By adopting the above technical solution, the online grounding resistance monitor is equipped with a resistance change detection device and an alarm device. When a resistance change is detected and reaches a predetermined threshold, i.e. when the backflow is abnormal, the alarm device will trigger an alarm.

[0016] 3. Beneficial effects

[0017] One or more technical solutions provided in this application have at least the following technical effects or advantages: When there is backflow of blood in the intravenous catheter, there is reverse pressure inside the catheter. Due to the resistance of the second spring, the blocking ball is pushed to close the injection connection tube, forming one-way injection and backflow blocking effect. When there is backflow, the reverse pressure inside the catheter causes the piston block to squeeze the first spring along the L-shaped cavity, and forces the push rod to push the resistor block to move along the resistor piece, reducing the actual length of the resistor piece electrically connected to the two cables. This allows the resistance monitor to detect the backflow of blood in the intravenous catheter, issue a backflow alarm command in a timely manner, and promptly remind medical staff to deal with the backflow phenomenon. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the PICC catheter anti-backflow monitoring device disclosed in a preferred embodiment of this application;

[0019] Figure 2 This is a schematic cross-sectional view of the obstructed catheter and arc-shaped block of the PICC catheter anti-backflow monitoring device disclosed in a preferred embodiment of this application;

[0020] Figure 3 A preferred embodiment of the PICC catheter backflow prevention monitoring device disclosed in this application Figure 2 Enlarged structural diagram at point A in the middle;

[0021] The following are the labels in the diagram: 1. Occlusion catheter; 11. Large conical cavity; 12. Small cavity; 2. Injection connection tube; 3. Catheter connection tube; 4. Arc-shaped block; 41. L-shaped cavity; 42. Sliding cavity; 5. Monitoring mechanism; 51. Piston block; 52. First spring; 53. Push rod; 54. Resistance block; 55. Cable; 56. Resistance element; 6. Occlusion ball; 7. Second spring. Detailed Implementation

[0022] The present application will be further described in detail below with reference to the accompanying drawings.

[0023] Reference Figures 1 to 3 This application provides a PICC catheter anti-backflow monitoring device, comprising: an obstruction catheter 1, with an injection connection tube 2 and a catheter connection tube 3 fixedly connected to both ends of the obstruction catheter 1, the injection connection tube 2 for connecting a syringe, and the catheter connection tube 3 for connecting an intravenous catheter; a one-way valve structure is provided inside the obstruction catheter 1, the one-way valve structure including an obstruction ball 6 and a second spring 7; an arc-shaped block 4 is fixedly provided on the obstruction catheter 1, the arc-shaped block 4 having an L-shaped cavity 41 and a sliding cavity 42, and a monitoring mechanism 5 is installed inside the arc-shaped block 4; the monitoring mechanism 5 includes two cables 55, the cables 55 being electrically connected to a resistor 56 and a resistor block 54 respectively; the resistor 56 is fixedly disposed in the sliding cavity 42, and the resistor block 54 is slidably disposed in the sliding cavity 42 and is in contact with the resistor 56; a push rod 53 is fixedly connected to the resistor block 54, the push rod 53 being sleeved with a first spring 52, and its end being fixedly connected to... A piston block 51 is slidably disposed within an L-shaped cavity 41, which is connected to a catheter connection tube 3. An injection connection tube 2 and a catheter connection tube 3 are fixedly connected to both ends of the blocking catheter 1. The catheter connection tube 3 is used to connect to an intravenous catheter. The blocking catheter 1 has a one-way valve structure consisting of a blocking ball 6 and a second spring 7, allowing the syringe to be connected to the injection connection tube 2 for intravenous infusion therapy. This also prevents backflow of blood from the intravenous catheter. When backflow occurs, the catheter connection tube 3 experiences reverse pressure, causing the piston block 51 within the L-shaped cavity 41 to force the first spring 52 to deform elastically. This, in turn, pushes the resistor block 54 along the sliding cavity 42 via a push rod 53, reducing the actual length of the resistor piece 56 electrically connected to the two cables 55. This allows the resistance monitor connected to the cables 55 to detect backflow of blood from the intravenous catheter, promptly issuing a backflow alarm command to alert medical personnel to address the backflow.

[0024] Reference Figure 1 and Figure 2 The obstruction catheter 1 is provided with a conical large cavity 11 and a small cavity 12. The obstruction ball 6 and the second spring 7 are located in the conical large cavity 11. The second spring 7 is larger than the small cavity 12, so the second spring 7 will squeeze the obstruction ball 6 to seal the injection connection tube 2, forming a one-way valve structure.

[0025] Reference Figure 1 and Figure 2 The small cavity 12 and the connecting end face of the catheter connecting tube 3 are conical, and one end of the L-shaped cavity 41 is located at the connecting end face of the small cavity 12 and the connecting tube 3. The connecting end face of the small cavity 12 and the connecting tube 3 is a conical structure. Therefore, when the syringe is connected to the injection connecting tube 2 for intravenous infusion therapy, because one end of the L-shaped cavity 41 is located at the connecting end face of the small cavity 12 and the connecting tube 3, the infusion will be directly injected into the vein in the catheter. The positive infusion pressure in the catheter has little effect on the piston block 51 in the L-shaped cavity 41. When blood returns to the intravenous catheter, the reverse pressure in the catheter can easily and smoothly squeeze into the L-shaped cavity 41 and force the piston block 51 to slide, causing the first spring 52 to deform elastically.

[0026] Reference Figure 2 and Figure 3 The push rod 53 moves through the L-shaped cavity 41 and extends into the sliding cavity 42. The first spring 52 is located in the L-shaped cavity 41. The piston block 51 slides along the L-shaped cavity 41, causing the first spring 52 to elastically deform and forcing the push rod 53 to push the resistor block 54 to slide along the sliding cavity 42. Since one cable 55 is connected to one end of the resistor piece 56 and the other cable 55 is electrically connected to the resistor block 54, the resistor block 54 slides along the other end of the resistor piece 56. Thus, when the piston block 51 slides, the actual stroke of the resistor piece 56 participating in the monitoring circuit changes.

[0027] Reference Figure 2 and Figure 3 The cable 55 extends to the outside of the arc block 4 and is electrically connected to the online grounding resistance monitor. The device model is MC-04. The online grounding resistance monitor is equipped with a resistance change detection device and an alarm device. When a resistance change is detected and reaches a predetermined threshold, i.e. when the blood return is abnormal, the alarm device will sound an alarm.

[0028] Working principle: The two ends of the blocking catheter 1 are fixedly connected to an injection connection tube 2 and a catheter connection tube 3, respectively. The catheter connection tube 3 is used to connect to an intravenous catheter. The blocking catheter 1 has a one-way valve structure consisting of a blocking ball 6 and a second spring 7, which allows the syringe to be connected to the injection connection tube 2 for intravenous infusion therapy. At the same time, it achieves the purpose of preventing backflow of the intravenous catheter. When there is backflow of the intravenous catheter, the catheter connection tube 3 is subjected to reverse pressure. The piston block 51 in the L-shaped cavity 41 forces the first spring 52 to deform elastically, and pushes the resistor block 54 to slide along the sliding cavity 42 through the push rod 53. This reduces the actual length of the resistor piece 56 electrically connected by the two cables 55. Thus, the resistance monitor connected by the cables 55 can detect the backflow of the intravenous catheter, issue a backflow alarm command in time, and remind medical staff to deal with the backflow.

Claims

1. A PICC catheter backflow prevention monitoring device, characterized in that: Includes: an obstruction catheter (1), with an injection connection tube (2) and a catheter connection tube (3) fixedly connected to both ends of the obstruction catheter (1), the injection connection tube (2) being used to connect a syringe, and the catheter connection tube (3) being used to connect an intravenous catheter; the obstruction catheter (1) is provided with a one-way valve structure inside, the one-way valve structure including an obstruction ball (6) and a second spring (7); an arc-shaped block (4) is fixedly provided on the obstruction catheter (1), the arc-shaped block (4) being provided with an L-shaped cavity (41) and a sliding cavity (42), and a monitoring mechanism (5) is installed inside the arc-shaped block (4); the monitoring mechanism (5) is... The mechanism (5) includes two cables (55), which are electrically connected to a resistor (56) and a resistor block (54) respectively. The resistor (56) is fixedly disposed in the sliding cavity (42), and the resistor block (54) is slidably disposed in the sliding cavity (42) and is in close contact with the resistor (56). The resistor block (54) is fixedly connected to a push rod (53), and the push rod (53) is fitted with a first spring (52) and a piston block (51) is fixedly connected to its end. The piston block (51) is slidably disposed in an L-shaped cavity (41), and the L-shaped cavity (41) is connected to the conduit connecting pipe (3).

2. The PICC catheter backflow prevention monitoring device according to claim 1, characterized in that: The obstruction catheter (1) is provided with a large conical cavity (11) and a small cavity (12), and the obstruction ball (6) and the second spring (7) are located in the large conical cavity (11).

3. The PICC catheter backflow prevention monitoring device according to claim 2, characterized in that: The connection end face between the small cavity (12) and the catheter connecting tube (3) is a conical surface, and one end of the L-shaped cavity (41) is located at the connection end face between the small cavity (12) and the catheter connecting tube (3).

4. The PICC catheter backflow prevention monitoring device according to claim 1, characterized in that: The push rod (53) moves through the L-shaped cavity (41) and extends into the sliding cavity (42), and the first spring (52) is located in the L-shaped cavity (41).

5. The PICC catheter backflow prevention monitoring device according to claim 1, characterized in that: The cable (55) extends to the outside of the arc block (4) and is electrically connected to the grounding resistance online monitoring instrument, the model of which is MC-04.

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