Disposable sterile peripherally inserted central catheter

Abstract

The present invention relates to a disposable sterile peripherally inserted central venous catheter, comprising an implant tube body, an extension tube and a connector, wherein one end of the implant tube body is fixed on a fixing seat, one end of the extension tube is also fixed on the fixing seat, and the implant tube body and the extension tube are connected inside the fixing seat, and the free end of the extension tube is fixed and connected with the connector; a control valve pad is provided inside the connector, and a positive pressure valve and a negative pressure valve are provided on the control valve pad. During normal infusion, the positive pressure valve is opened and the negative pressure valve is closed to ensure the forward flow of liquid; when a back-drawing device is used for reverse back-drawing, the negative pressure valves on both sides are opened and the positive pressure valve is closed to ensure the backflow of liquid from the side holes; when no infusion or back-drawing is performed, the positive pressure valve and the negative pressure valve are closed at the same time, so as to balance the pressure inside and outside the connector, so as to avoid the generation of negative pressure when the back-drawing device is pulled out from the connector, and the negative pressure in the connector will cause blood reflux and cause tube blockage.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a disposable sterile peripherally inserted central venous catheter. Background Art

[0002] Central venous catheters are important channels for intraoperative and postoperative monitoring, fluid transfusion, and infusion of various rescue drugs for critically ill patients. Inpatients in intensive care units need long-term infusion, blood product transfusion, intravenous nutrition therapy, and other peripheral repeated venous punctures, which inevitably cause pain to patients. In addition, drugs and hypertonic fluids may damage blood vessels and make peripheral vascular puncture difficult. At this time, central venous catheters are a better choice. Central venous catheters usually include the following four types: percutaneous central venous catheters (CVC), peripherally inserted central venous catheters (PICC), tunneled central venous catheters (CVTC), and intravenous ports (PORT).

[0003] PICC - a deep venous catheter placement procedure in which a central venous catheter is inserted by peripheral venous puncture and its tip is positioned at the entrance of the superior vena cava or right atrium, and an extension tube placed outside the human body is connected to its outer end. The extension tube serves as a connector that communicates with external equipment to perform infusions or blood draws on patients. The extension tube is provided with a catheter clamp that controls the on / off of the catheter. When performing infusions or blood draws, the catheter clamp is opened, and the catheter clamp is closed after the infusion or blood draw is completed. There is a time difference between the opening and closing of the catheter clamp and the infusion or blood draw action, which is difficult to achieve consistency. Due to the effect of the pressure difference in the tube, it is easy to cause air embolism to form in the catheter during use, or blood backflow and coagulation to block the catheter, affecting the treatment effect and causing the patient to be emotionally disturbed, and even requiring re-catheterization, causing unnecessary pain to the patient. Therefore, it is a problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a disposable sterile peripherally inserted central venous catheter.

[0005] The specific contents are as follows: A disposable sterile peripherally inserted central venous catheter, comprising an implanted tube body, an extension tube and a connector, characterized in that:

[0006] One end of the implant tube body is fixed on the fixing seat, one end of the extension tube is also fixed on the fixing seat, and the implant tube body and the extension tube are connected inside the fixing seat, and the free end of the extension tube is fixed and connected to the connector;

[0007] The connecting body comprises an upper cover body, a lower cover body and a control valve pad;

[0008] The upper cover body is a hollow shell connected at both ends, and a first upper step surface cut inwardly from the end surface is provided on the inner surface of the lower end of the upper cover body, and a second upper step surface cut inwardly from the first upper step surface is also provided on the inner surface of the lower end of the upper cover body, and the size of the second upper step surface is smaller than that of the first upper step surface, and an annular positioning groove is provided at the root of the second upper step surface, and an annular fixing protrusion protruding downward is provided on the lower surface of the upper cover body;

[0009] The lower cover body is a hollow shell with two ends connected. The lower end of the lower cover body is fixed and connected to the extension tube. A first lower step body protruding upward is provided at the upper end of the lower cover body. The size and shape of the first lower step body correspond to those of the first upper step surface. An annular second lower step body is provided at the upper end of the first lower step body. An annular fixing groove is provided at the root of the first lower step body. The size and shape of the fixing groove correspond to those of the fixing protrusion.

[0010] The contour shape of the control valve pad matches the shape of the second upper step surface, and an annular upper fixing strip is provided on the edge of the upper surface of the control valve pad. The size and shape of the upper fixing strip correspond to the positioning groove, and an annular lower fixing strip is provided on the edge of the lower surface of the control valve pad. The inner side of the lower fixing strip matches the outer side of the second lower step body. The control valve pad is placed in the second upper step surface of the upper cover body, and the lower end of the upper cover body is correspondingly buckled with the upper end of the lower cover body to fix the two together. The fixing protrusion of the upper cover body is correspondingly inserted into the fixing groove of the lower cover body, and the upper fixing strip of the control valve pad is correspondingly stuck in the positioning groove, and the lower fixing strip of the control valve pad is sleeved on the outer side of the second lower step body, and the control valve pad is sealed and pressed between the upper cover body and the lower cover body;

[0011] A downwardly protruding positive pressure valve is provided on the central axis of the control valve pad, and a vertically penetrating slit A is provided on the positive pressure valve. Two upwardly protruding negative pressure valves are symmetrically provided on the control valve pad and located on both sides of the positive pressure valve, and a vertically penetrating slit B is provided on the negative pressure valve. The overall size of the negative pressure valve is smaller than that of the positive pressure valve.

[0012] Preferably, the positive pressure valve and the negative pressure valve are both valve check valves composed of symmetrical valves.

[0013] Preferably, the upper cover body and the lower cover body are both made of medical plastic.

[0014] Preferably, the control valve pad, the upper fixing strip and the lower fixing strip are all made of silicone.

[0015] Preferably, the upper half of the upper cover body is cylindrical, and an external thread is provided on the outer side of the cylinder.

[0016] Preferably, two symmetrical fixing ears are provided on the side of the fixing seat, and each fixing ear is provided with a through hole.

[0017] Beneficial technical effects of the present invention:

[0018] The present invention discloses a disposable sterile peripherally inserted central venous catheter, comprising an implant tube body, an extension tube and a connector, wherein one end of the implant tube body is fixed on a fixing seat, one end of the extension tube is also fixed on the fixing seat, and the implant tube body is connected with the extension tube inside the fixing seat, and the free end of the extension tube is fixed and connected with the connector; a control valve pad is provided inside the connector, and a positive pressure valve and a negative pressure valve are provided on the control valve pad to prevent the valve from being folded under force, and during normal infusion, the positive pressure valve is opened and the negative pressure valve is closed to ensure the forward flow of liquid; when a withdrawal device is used for reverse withdrawal, the negative pressure valves on both sides are opened and the positive pressure valve is closed to ensure the reflux of liquid from the side holes; when no infusion or withdrawal is performed, the positive pressure valve and the negative pressure valve are closed at the same time, so as to balance the pressure inside and outside the connector to avoid negative pressure when the withdrawal device is pulled out of the connector, and the negative pressure in the connector will cause blood reflux and cause tube blockage, and the catheter is convenient to use, has a wide range of applications, and is cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a disposable sterile peripherally inserted central venous catheter;

[0020] Figure 2 is a schematic diagram of the three-dimensional structure of the connector;

[0021] Figure 3 for Figure 2 Cross-section view in the AA direction;

[0022] Figure 4 for Figure 3 A partial enlarged schematic diagram of B in the middle;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the upper cover;

[0024] Figure 6 It is a schematic diagram of the main cross-sectional structure of the upper cover body;

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the lower cover;

[0026] Figure 8 It is a schematic diagram of the main cross-sectional structure of the lower cover body;

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the control valve pad;

[0028] Fig.10 for Fig. 9 Cross-sectional view in the mid-CC direction;

[0029] In the figure: 11. implant catheter, 21. fixing seat, 22. fixing ear, 23. through hole, 31. extension tube, 41. lower cover body, 411. first lower step body, 412. fixing groove, 413. second lower step body, 42. upper cover body, 421. fixing protrusion, 422. first upper step surface, 423. second upper step surface, 424. positioning groove, 43. cylindrical upper half of the upper cover body, 44. external thread, 51. control valve pad, 52. positive pressure valve, 53. slit A, 54. negative pressure valve, 55. slit B, 56. upper fixing strip, 57. lower fixing strip. DETAILED DESCRIPTION

[0030] Example 1, see Figure 1-10 , a disposable sterile peripherally inserted central venous catheter, including an implant body, an extension tube and a connector;

[0031] One end of the implant tube body is fixed on the fixing seat, one end of the extension tube is also fixed on the fixing seat, and the implant tube body and the extension tube are connected inside the fixing seat, and the free end of the extension tube is fixed and connected to the connector;

[0032] The connecting body comprises an upper cover body, a lower cover body and a control valve pad;

[0033] The upper cover body is a hollow shell connected at both ends, and a first upper step surface cut inwardly from the end surface is provided on the inner surface of the lower end of the upper cover body, and a second upper step surface cut inwardly from the first upper step surface is also provided on the inner surface of the lower end of the upper cover body, and the size of the second upper step surface is smaller than that of the first upper step surface, and an annular positioning groove is provided at the root of the second upper step surface, and an annular fixing protrusion protruding downward is provided on the lower surface of the upper cover body;

[0034] The lower cover body is a hollow shell with two ends connected. The lower end of the lower cover body is fixed and connected to the extension tube. A first lower step body protruding upward is provided at the upper end of the lower cover body. The size and shape of the first lower step body correspond to those of the first upper step surface. An annular second lower step body is provided at the upper end of the first lower step body. An annular fixing groove is provided at the root of the first lower step body. The size and shape of the fixing groove correspond to those of the fixing protrusion.

[0035] The contour shape of the control valve pad matches the shape of the second upper step surface, and an annular upper fixing strip is provided on the edge of the upper surface of the control valve pad. The size and shape of the upper fixing strip correspond to the positioning groove, and an annular lower fixing strip is provided on the edge of the lower surface of the control valve pad. The inner side of the lower fixing strip matches the outer side of the second lower step body. The control valve pad is placed in the second upper step surface of the upper cover body, and the lower end of the upper cover body is correspondingly buckled with the upper end of the lower cover body to fix the two together. The fixing protrusion of the upper cover body is correspondingly inserted into the fixing groove of the lower cover body, and the upper fixing strip of the control valve pad is correspondingly stuck in the positioning groove, and the lower fixing strip of the control valve pad is sleeved on the outer side of the second lower step body, and the control valve pad is sealed and pressed between the upper cover body and the lower cover body;

[0036] A downwardly protruding positive pressure valve is provided on the central axis of the control valve pad, and a vertically penetrating slit A is provided on the positive pressure valve. Two upwardly protruding negative pressure valves are symmetrically provided on the control valve pad and located on both sides of the positive pressure valve, and a vertically penetrating slit B is provided on the negative pressure valve. The overall size of the negative pressure valve is smaller than that of the positive pressure valve.

[0037] The positive pressure valve and the negative pressure valve are both valve check valves composed of symmetrical valves.

[0038] The materials of the upper cover body and the lower cover body are both medical plastics, and the materials of the control valve pad, the upper fixing strip and the lower fixing strip are all silicone.

[0039] The upper half of the upper cover body is cylindrical, and an external thread is provided on the outer side of the cylinder. The external thread is used to connect the connector to external equipment.

[0040] Two symmetrical fixing ears are arranged on the side of the fixing seat, and each fixing ear is provided with a through hole.

[0041] The use process and principle of the present invention:

[0042] The medical professional inserts the implant tube body of the intravenous catheter into the corresponding vein of the patient, and the extension tube and the connector are fixed outside the human body. According to the treatment needs, when the patient needs infusion, the connector is connected to the infusion device through its external thread. After the infusion starts, under the pressure of the liquid, the positive pressure valve on the control valve pad is opened after being affected by the positive pressure of the liquid, and the two negative pressure valves are closed under pressure to ensure the positive flow of the liquid. When the patient needs to withdraw blood, the connector is connected to the withdrawal device through its external thread. After the blood is drawn, under the negative pressure of the withdrawal device, the positive pressure valve is closed and the two negative pressure valves are opened to ensure that the blood flows out from the negative pressure valves on both sides. When no infusion or withdrawal is performed, the positive pressure valve and the negative pressure valve are closed at the same time, which balances the pressure inside and outside the connector to avoid negative pressure when the withdrawal device is pulled out of the connector. The negative pressure in the connector can cause blood reflux and cause tube blockage. It is easy to use, has a wide range of applications, and is cost-effective.

Claims

1. A disposable sterile peripherally inserted central venous catheter, comprising an implant body, an extension tube and a connector, characterized in that: One end of the implant tube body is fixed on the fixing seat, one end of the extension tube is also fixed on the fixing seat, and the implant tube body and the extension tube are connected inside the fixing seat, and the free end of the extension tube is fixed and connected to the connector; The connecting body comprises an upper cover body, a lower cover body and a control valve pad; The upper cover body is a hollow shell connected at both ends, and a first upper step surface cut inwardly from the end surface is provided on the inner surface of the lower end of the upper cover body, and a second upper step surface cut inwardly from the first upper step surface is also provided on the inner surface of the lower end of the upper cover body, and the size of the second upper step surface is smaller than that of the first upper step surface, and an annular positioning groove is provided at the root of the second upper step surface, and an annular fixing protrusion protruding downward is provided on the lower surface of the upper cover body; The lower cover body is a hollow shell with two ends connected. The lower end of the lower cover body is fixed and connected to the extension tube. A first lower step body protruding upward is provided at the upper end of the lower cover body. The size and shape of the first lower step body correspond to those of the first upper step surface. An annular second lower step body is provided at the upper end of the first lower step body. An annular fixing groove is provided at the root of the first lower step body. The size and shape of the fixing groove correspond to those of the fixing protrusion. The contour shape of the control valve pad matches the shape of the second upper step surface, and an annular upper fixing strip is provided on the edge of the upper surface of the control valve pad. The size and shape of the upper fixing strip correspond to the positioning groove, and an annular lower fixing strip is provided on the edge of the lower surface of the control valve pad. The inner side of the lower fixing strip matches the outer side of the second lower step body. The control valve pad is placed in the second upper step surface of the upper cover body, and the lower end of the upper cover body is correspondingly buckled with the upper end of the lower cover body to fix the two together. The fixing protrusion of the upper cover body is correspondingly inserted into the fixing groove of the lower cover body, and the upper fixing strip of the control valve pad is correspondingly stuck in the positioning groove, and the lower fixing strip of the control valve pad is sleeved on the outer side of the second lower step body, and the control valve pad is sealed and pressed between the upper cover body and the lower cover body; A downwardly protruding positive pressure valve is provided on the central axis of the control valve pad, a vertically penetrating slit A is provided on the positive pressure valve, two upwardly protruding negative pressure valves are symmetrically provided on the control valve pad and located on both sides of the positive pressure valve, a vertically penetrating slit B is provided on the negative pressure valve, and the overall size of the negative pressure valve is smaller than that of the positive pressure valve; The positive pressure valve and the negative pressure valve are both valve check valves composed of symmetrical valves; The upper cover body and the lower cover body are both made of medical plastics; The control valve pad, the upper fixing strip and the lower fixing strip are all made of silicone.

2. The disposable sterile peripherally inserted central venous catheter according to claim 1, characterized in that: The upper half of the upper cover body is cylindrical, and an external thread is arranged on the outer side of the cylinder.

3. The disposable sterile peripherally inserted central venous catheter according to claim 1, characterized in that: Two symmetrical fixing ears are arranged on the side of the fixing seat, and each fixing ear is provided with a through hole.

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