Disposable sterile peripherally inserted central catheter set

Abstract

The invention relates to a disposable sterile peripheral central venous catheter set. The catheter set comprises an in-vivo tube, an in-vitro tube, a connecting seat and an infusion connector, a three-way valve is arranged on the side face of the front end of the in The three-way valve comprises a valve gap, a reaction wall A and a reaction wall B, the first reaction wall and the second reaction wall are arranged on the two sides of the valve gap and are integrally formed with the in-vivo tube; the reaction wall A is thicker than the reaction wall B; the connecting base comprises a front pipe body and a rear pipe body which are buckled at a time. The in-vivo pipe can be cut off before buckling, so that the length of the part, which is left outside the body, of the cut-off in-vivo pipe is proper; in this way, the situation that circulation is blocked due to the fact that an in-vivo tube is squeezed to be flat due to the action of a patient can be avoided; the first reaction wall and the second reaction wall of the three-way valve are of an asymmetric structure, so that whether the thin second reaction wall is opened inwards or outwards, the first reaction wall and the second reaction wall are superior to those of the thick first reaction wall; the overall resistance of the three-way valve is very small, and the acting stability of the three-way valve is guaranteed.

Description

Technical Field

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

[0002] A peripherally inserted central venous catheter (PICC) is a catheter inserted into a patient's body; the insertion site is from a vein in the peripheral arm to a large vein near the atrium. A portion of the catheter remains outside the body for intravenous infusion. Therefore, a typical PICC consists of a one-piece internal tubing, an external tubing, and a connector; the tip of the internal tubing connects the inside and outside of the catheter via a three-way valve; the standard three-way valve has a symmetrical arched structure; the connector connects the internal and external tubing. Generally, the length of the internal tubing is designed according to the longest possible dimension. Existing peripherally inserted central venous catheters (PICCs) have the following disadvantages: 1) When doctors insert a PICC, it is often necessary to coil the excess tubing outside the body and then fix it with a dressing. This coiled tubing is tightly attached to the skin and is easily affected by the patient's movements, potentially causing it to flatten and block the flow, thus affecting the normal use of the PICC; 2) The arched structure of the three-way valve makes it easy to open outwards, which is beneficial for intravenous infusion, but difficult to open inwards, making it inconvenient for blood draws through the catheter; 3) Our company previously applied for a patent application (application number 201710187922.1) for a low-resistance three-way valve for catheters. This three-way valve uses a concave surface to change the arched structure on both sides of the valve slit. This concave surface easily accumulates fibrin sheaths, causing blockage of the three-way valve. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a disposable sterile peripherally inserted central venous catheter kit.

[0004] The technical solution of this invention is: a disposable sterile peripherally inserted central venous catheter kit, comprising an internal tube, an external tube, a connector, and an infusion connector; most of the external tube is inserted into the human body, with a small portion remaining outside the body; the internal tube, inserted into the body, isolates the intratubular environment from the veins in the arm, preventing medication from contacting the veins and irritating the vessel walls; the external tube is used to connect with a dressing, thereby fixing the connector to the skin surface; the external tube is used to connect to an external infusion set or syringe for drug administration or blood draw; a three-way valve is provided on the front side of the internal tube; the three-way valve allows communication between the inside and outside of the internal tube; when the three-way valve is open inward, blood flows from outside to inside for blood draw; when the three-way valve is open outward... When the pressure inside the tube is greater than the pressure outside, it flows outward for drug delivery. When the pressure inside and outside the tube reaches equilibrium, the three-way valve closes, and the inside and outside of the tube are no longer connected. This three-way valve includes a valve slit, reaction wall A, and reaction wall B. Reaction walls A and B are located on both sides of the valve slit and are integrally formed with the in vivo tube, both possessing a certain degree of elasticity. The thickness of reaction wall A is greater than that of reaction wall B, resulting in reaction wall B having a faster elastic deformation rate and greater elastic deformation amount than reaction wall A. When the pressure inside the in vivo tube is greater than the pressure outside, reaction wall B reacts before reaction wall A, causing reaction wall B to open outward first, forming a flow channel between the inside and outside of the in vivo tube. Reaction wall A remains essentially undeformed. When the pressure inside the in vivo tube is less than the pressure outside, reaction wall B reacts first. The reaction occurs in reaction wall A, causing reaction wall B to open inward first, forming a flow channel between the inside and outside of the inner tube; reaction wall A remains essentially unchanged; when the pressure inside the inner tube equals the pressure outside the inner tube, neither reaction wall B nor reaction wall A undergoes elastic deformation, and the flow channel between the inside and outside of the inner tube is blocked; the connector includes a front tube body and a rear seat body; the front tube body has an insertion hole at its end; an elastic sealing sleeve is embedded in the insertion hole; a retaining groove is provided on the side of the end of the front tube body; the rear seat body has an insertion post at its front end that matches the insertion hole; the insertion post is inserted into the insertion hole, causing the rear seat body and the front tube body to be radially limited; the insertion post has a pin hole penetrating the rear seat body at its axis; a needle is inserted into the pin hole; the inner tube passes through the front tube body and the sealing sleeve in sequence, and is fitted onto the needle. The front end; the sealing sleeve is deformed by compression due to the insertion of the insert post into the insert hole; the deformed sealing sleeve compresses the inner tube, making the inner tube tightly adhere to the side of the needle tube, achieving a sealed connection; symmetrical buckle strips are provided on both sides of the insert post; the front end of the buckle strip has an inward-facing buckle tooth; the buckle tooth and buckle groove are fastened together, making the rear seat body and the front tube body a single unit; the fastening structure of the rear seat body and the front tube body cannot be disassembled, so it is assembled in one go; the front end of the external tube is installed at the tail of the rear seat body and connects to the rear end of the needle tube; in this way, the inner tube, the needle tube, and the inner tube form a connected relationship, which can be used for infusion and blood drawing; an infusion connector is installed at the rear end of the external tube for connecting an infusion tube or syringe for infusion or blood drawing; the inner tube, the external tube, the connector, and the infusion connector are all sterilized and then aseptically packaged.

[0005] Preferably, the rear end of the in vivo tube covers the portion of the front end of the needle that extends beyond the insertion column, thereby enhancing the connection strength between the in vivo tube and the needle.

[0006] Preferably, the connector also includes an anti-bend sleeve; the inner tube passes through the anti-bend sleeve; the rear end of the anti-bend sleeve is fitted onto the front end of the front tube body; the anti-bend sleeve is made of rubber; the anti-bend sleeve can protect the inner tube and prevent the inner tube from folding at the front end of the front tube body, causing the inner tube to be blocked.

[0007] Furthermore, the front tube body has several annular serrated rings evenly distributed along its front end; the inner wall of the rear end of the anti-bend sleeve is provided with a serrated ring groove corresponding to the serrated rings; the serrated rings and the serrated ring grooves cooperate to increase the connection strength between the front tube body and the anti-bend sleeve.

[0008] Preferably, a snap-fit ​​bevel is provided at the rear end of the front tube body; the snap-fit ​​bevel matches the snap-fit ​​groove; the snap-fit ​​bevel guides the snap teeth to facilitate the snap teeth being snapped into the snap-fit ​​groove smoothly.

[0009] Furthermore, the side of the rear seat is provided with a reinforcing rib for connecting the buckle strip, which can strengthen the connection between the buckle strip and the connecting seat.

[0010] Preferably, the tip of the internal tube is equipped with a contrast agent; this contrast agent can display traces under CT, which helps doctors to intuitively determine the position of the tip of the internal tube in the human body, and facilitates the placement of the tube.

[0011] Preferably, the rear seat has an inner groove in the middle; the inner end face of the inner groove is an arc surface, which is conducive to the doctor holding the rear seat with his hand.

[0012] Preferably, the inner edge of the end face of reaction wall A is chamfered, which can reduce the stroke of reaction wall B when it opens inward.

[0013] The beneficial effects of this invention are as follows: The disposable sterile peripherally inserted central venous catheter kit of this invention has the following advantages: (1) The connector of the present invention is a disposable snap-fit ​​structure, which can cut the internal tube before snap-fitting so that the length of the part of the internal tube left outside the body after cutting is appropriate; in this way, the internal tube can be squeezed and blocked by the patient's movements; the reaction wall A and reaction wall B of the three-way valve of the present invention have an asymmetrical structure, so that the thinner reaction wall B is better than the thicker reaction wall A, whether it opens inward or outward; the resistance of the three-way valve as a whole is very small, ensuring the stability of the three-way valve in action; (2) The anti-folding sleeve of the present invention can protect the inner tube and prevent the inner tube from folding at the front end of the front tube body, which would cause the inner tube to be blocked. Attached Figure Description

[0014] Figure 1 This is a perspective view of the disposable sterile peripheral central venous catheter kit of the present invention; Figure 2 yes Figure 1 A partial sectional view of the front view; Figure 3 yes Figure 2 AA section view; Figure 4 yes Figure 2 BB section view; Figure 5 This is a three-dimensional view of the front tube body; Figure 6 This is a three-dimensional sectional view of the front tube body; Figure 7 It is a three-dimensional diagram of the rear seat; Figure 8 This is a sectional perspective view of the rear seat. Figure 9 This is the working state of the three-way valve. Figure 1 ; Figure 10 This is the working state of the three-way valve. Figure 2 ; Figure 1-3 , Figure 9-10 In this context, the three-way valve is actually an extremely fine slit; to clearly demonstrate the structure and principle of this invention, Figure 1-3 , Figure 9-10 Widen the gap when composing the image.

[0015] In the diagram: 1. Intracorporeal tube, 11. Three-way valve, 111. Valve gap, 112. Reaction wall A, 1121. Chamfer, 113. Reaction wall B, 1131. Groove, 12. Imaging, 2. Extracorporeal tube, 3. Connector, 31. Front tube body, 311. Insertion hole, 312. Sealing sleeve, 313. Fastening groove, 314. Serrated ring, 315. Fastening bevel, 316. Stop block, 32. Rear seat body, 321. Insertion post, 322. Pin hole, 323. Needle tube, 324. Fixing hole, 325. Fastening strip, 3251. Fastening tooth, 326. Inner groove, 327. Rib plate, 33. Anti-fold sleeve, 331. Serrated ring groove, 4. Infusion connector. Implementation

[0016] Example 1: See Figure 1-10A disposable sterile peripherally inserted central venous catheter kit includes an internal tube 1, an external tube 2, a connector 3, and an infusion connector 4. The external tube 2 is mostly inserted into the body, with a small portion remaining outside. The internal tube 1 isolates the intratubular environment from the veins in the arm, preventing medication from contacting the veins and irritating the vessel walls. The external tube 1 connects to a dressing, thus securing the connector 3 to the skin surface. The external tube 2 connects to an external infusion set or syringe for medication administration or blood draw. A three-way valve 11 is located on the front side of the internal tube 1. The three-way valve 11 connects the inside and outside of the internal tube 1; when the three-way valve 11 opens inward, blood flows from the outside to the inside for blood draw. When valve 11 opens outwards, flow occurs from inside the tube to outside for drug delivery. When the pressure inside and outside the in vivo tube 1 reaches equilibrium, valve 11 closes, and the inside and outside of the tube are no longer connected. Valve 11 includes a valve slit 111, reaction wall A 112, and reaction wall B 113. Reaction walls A 112 and B 113 are located on both sides of the valve slit 111 and are integrally formed with the in vivo tube 1, both possessing a certain degree of elasticity. The thickness of reaction wall A 112 is greater than that of reaction wall B 113, resulting in a faster elastic deformation rate and greater elastic deformation of reaction wall B 113 compared to reaction wall A 112. When the pressure inside the in vivo tube 1 is greater than the pressure outside the in vivo tube 1, reaction wall B 113 reacts before reaction wall A 112, causing reaction wall B 113 to open outwards first. This forms a flow channel between the inside and outside of the inner tube 1; the reaction wall A 112 remains largely undeformed; when the pressure inside the inner tube 1 is less than the pressure outside the inner tube 1, the reaction wall B 113 reacts before the reaction wall A 112, causing the reaction wall B 113 to open inward first, forming a flow channel between the inside and outside of the inner tube 1; the reaction wall A 112 remains largely undeformed; when the pressure inside the inner tube 1 equals the pressure outside the inner tube 1, neither the reaction wall B 113 nor the reaction wall A 112 undergoes elastic deformation, and the flow channel between the inside and outside of the inner tube 1 is blocked; the connecting seat 3 includes a front tube body 31 and a rear seat body 32; the end of the front tube body 31 is provided with an insertion hole 311; an elastic sealing sleeve 312 is embedded in the insertion hole 311; a buckle is provided on the side of the end of the front tube body 31. The rear seat 32 has a groove 313; the front end of the rear seat 32 is provided with a matching insertion pin 321 for inserting into the insertion hole 311; the insertion pin 321 is inserted into the insertion hole 311 so that the rear seat 32 and the front tube 31 are uniformly radially limited; the pin 321 has a pin hole 322 through the rear seat 32; a needle tube 323 is inserted into the pin hole 322; the inner tube 1 passes through the front tube 31 and the sealing sleeve 312 in sequence, and is fitted onto the front end of the needle tube 323; the sealing sleeve 312 is deformed by the insertion pin 321 being inserted into the insertion hole 311; the deformed sealing sleeve 312 squeezes the inner tube 1, so that the inner tube 1 is tightly attached to the side of the needle tube 323, achieving a sealed connection; the insertion pin 321 has symmetrical buckle strips 325 on both sides; the front end of the buckle strip 325 has an inward buckle tooth 3251.The buckle 3251 and buckle groove 313 are fastened together, making the rear seat body 32 and the front tube body 31 a single unit. The fastening structure of the rear seat body 32 and the front tube body 31 cannot be disassembled, so it is formed in one piece. The front end of the external tube 2 is installed at the tail of the rear seat body 32 and communicates with the rear end of the needle tube 323. In this embodiment, the tail of the rear seat body 32 is provided with a fixing hole 324. The front end of the external tube 2 is inserted into the fixing hole 324 for fixing. In this way, the internal tube 1, the needle tube 323, and the internal tube 1 are connected, which can be used for infusion and blood drawing. The rear end of the external tube 2 is equipped with an infusion connector 4 for connecting an infusion tube or syringe for infusion or blood drawing. The internal tube 1, the external tube 2, the connector 3, and the infusion connector 4 are all sterilized and then aseptically packaged.

[0017] In the prior art, the external tube 2 and the internal tube 1 are fixed together by a catheter seat; if the internal tube 1 in the prior art is cut, the head of the internal tube 1 will inevitably be cut off; however, the head of the internal tube 1 often needs to be equipped with functional components, such as a three-way valve 11 and a contrast agent 12; cutting off the head of the internal tube 1 will affect the application of these functional components.

[0018] Compared to existing technologies, the connecting seat 3 of this invention is a one-time snap-fit ​​structure. The internal tube 1 can be cut before snap-fitting, ensuring a suitable length of the portion remaining outside the body. Then, during the snap-fitting of the connecting seat 3, the internal tube 1 and the connecting seat 3 are stably and sealed together. This avoids the situation where the internal tube 1 is flattened and obstructs flow due to patient movement. The reaction walls A 112 and B 113 of the three-way valve 11 of this invention have an asymmetrical structure, making the thinner reaction wall B 113 superior to the thicker reaction wall A 112 in both inward and outward opening. The overall resistance experienced by the three-way valve 11 is very small, ensuring the stability of the three-way valve 11's operation. The outer surface of the internal tube 1 segment where the three-way valve 11 is located is a complete circumferential surface without any concave surfaces, thereby reducing the accumulation of fibrin sheath.

[0019] The rear end of the inner tube 1 covers the portion of the front end of the needle tube 323 that extends beyond the insertion post 321, thereby enhancing the connection strength between the inner tube 1 and the needle tube 323.

[0020] The inner wall of reaction wall B113 is provided with groove 1131, so that the thickness of reaction wall B113 is uniform and the elastic deformation of reaction wall B113 is stable.

[0021] The connector 3 also includes an anti-bend sleeve 33; the inner tube 1 passes through the anti-bend sleeve 33; the rear end of the anti-bend sleeve 33 is fitted onto the front end of the front tube 31; the anti-bend sleeve 33 is made of rubber; the anti-bend sleeve 33 can protect the inner tube 1 and prevent the inner tube 1 from folding at the front end of the front tube 31, causing the inner tube 1 to be blocked.

[0022] The front tube body 31 has several annular serrated rings 314 evenly distributed axially at its front end; the inner wall of the rear end of the anti-bend sleeve 33 is provided with a serrated ring groove 331 corresponding to the serrated rings 314; the serrated rings 314 and the serrated ring groove 331 cooperate to increase the connection strength between the front tube body 31 and the anti-bend sleeve 33.

[0023] The front tube body 31 has a fastening bevel 315 at the rear end; the fastening bevel 315 matches the fastening groove 313; the fastening bevel 315 guides the fastening tooth 3251 to help the fastening tooth 3251 be fastened smoothly in the fastening groove 313.

[0024] The fastening inclined surface 315 is provided with symmetrical stops 316 on both sides, which can provide a limit for the fastening teeth 3251 to be smoothly fastened in the fastening groove 313.

[0025] The front end of the internal tube 1 is equipped with a contrast agent 12; the contrast agent 12 can display traces under CT, which helps doctors to intuitively determine the position of the front end of the internal tube 1 in the human body, and facilitates the placement of the tube.

[0026] The rear seat body 32 has an inner groove 326 in the middle; the inner end face of the inner groove 326 is an arc surface, which is conducive to the doctor pinching the rear seat body 32 with his hand.

[0027] The inner edge of the end face of reaction wall A 112 is chamfered 1121, which can reduce the stroke when reaction wall B 113 opens inward.

[0028] In this embodiment, the fastening process of the connector 3 includes the following steps: ① Cut off tube 1 inside the body Based on the patient's body size, determine the required length of the internal tube 1 for this patient; cut the internal tube 1 according to this length so that the part of the internal tube 1 remaining outside the body after insertion is of an appropriate length, and will not be flattened or blocked due to the patient's movements. ② The rear end of the inner tube 1 is connected to the rear connector. After the rear end of the inner tube 1 passes through the anti-bend sleeve 33 and the front tube body 31 in sequence, it is fitted onto the front end of the needle tube 323; the inner tube 1 passes through the sealing sleeve 312 at the same time as it passes through the front tube body 31; when the inner tube 1 is fitted onto the front end of the needle tube 323, it covers the part of the needle tube 323 that extends beyond the insertion post 321. ③ Front tube body 31 and rear connector insertion Align the insert post 321 with the mounting hole and the snap tooth 3251 with the snap-fit ​​inclined surface 315; the front tube body 31 and the rear connector move closer to each other; the snap tooth 3251 slides on the snap-fit ​​inclined surface 315 until the snap tooth 3251 falls into the snap groove 313, forming a snap-fit ​​relationship; at this time, the insert post 321 is also inserted into the insert hole 311.

[0029] The working principle of the three-way valve 11 in this embodiment: Because the thickness of reaction wall A 112 is greater than the thickness of reaction wall B 113, the elastic deformation rate and elastic deformation amount of reaction wall B 113 are both better than those of reaction wall A 112. When the pressure inside the inner tube 1 is greater than the pressure outside the inner tube 1, the reaction wall B 113 reacts before the reaction wall A 112, causing the reaction wall B 113 to open outward first, forming a flow channel between the inside and outside of the inner tube 1; the reaction wall A 112 remains basically undeformed. When the pressure inside the in vivo tube 1 is less than the pressure outside the in vivo tube 1, the reaction wall B 113 reacts before the reaction wall A 112, causing the reaction wall B 113 to open inward first, forming a flow channel between the inside and outside of the in vivo tube 1; the reaction wall A 112 remains basically undeformed. When the pressure inside tube 1 equals the pressure outside tube 1, neither reaction wall B 113 nor reaction wall A 112 undergoes elastic deformation, and the flow channel between the inside and outside of tube 1 is blocked.

[0030] Example 2: Example 2 is basically the same as Example 1, and the similarities will not be repeated. The difference is that the side of the rear seat 32 is provided with a stiffener 327 for connecting the buckle 325, which can strengthen the connection between the buckle 325 and the connecting seat 3.

[0031] The inner side of the fastener 325 is inclined; the inclination angle of the inner side of the fastener 325 matches the fastening inclined surface 315, which can increase the connection strength between the fastener 325 and the stiffener 327.

Claims

1. A disposable sterile peripherally inserted central venous catheter kit, comprising an inner tube, an outer tube, a connector, and an infusion fitting; the inner tube has a three-way valve on its front end side; characterized in that, The three-way valve includes a valve slit, reaction wall A, and reaction wall B; reaction wall A and reaction wall B are located on both sides of the valve slit and are integrally formed with the in vivo tube; the thickness of reaction wall A is greater than the thickness of reaction wall B; the connector includes a front tube body and a rear seat body; the front tube body has an insertion hole at its end; an elastic sealing sleeve is embedded in the insertion hole; a buckle groove is provided on the side of the end of the front tube body; the front end of the rear seat body has an insertion post that matches the insertion hole; the insertion post has a needle hole through the rear seat body at its axis; a needle is inserted into the needle hole; the in vivo tube passes through the front tube body and the sealing sleeve in sequence and is fitted onto the front end of the needle; buckle strips are symmetrically provided on both sides of the insertion post; the front end of the buckle strip has an inward buckle tooth; the buckle tooth and the buckle groove are fastened together; the front end of the external tube is installed at the rear end of the rear seat body and communicates with the rear end of the needle; an infusion connector is installed at the rear end of the external tube.

2. The disposable sterile peripherally inserted central venous catheter kit according to claim 1, characterized in that: The rear end of the in-body tube covers the portion of the needle tube that extends beyond the insertion column.

3. The disposable sterile peripherally inserted central venous catheter kit according to claim 1, characterized in that: The connector also includes an anti-bend sleeve; the inner tube passes through the anti-bend sleeve; the rear end of the anti-bend sleeve is fitted onto the front end of the front tube body.

4. The disposable sterile peripherally inserted central venous catheter kit according to claim 1, characterized in that: The rear end of the front tube body is provided with a fastening bevel; this fastening bevel matches the fastening groove.

5. The disposable sterile peripherally inserted central venous catheter kit according to claim 1, characterized in that: The front end of the tube inside the body is equipped with a radiopaque material.

6. The disposable sterile peripherally inserted central venous catheter kit according to claim 1, characterized in that: The rear seat body has an inner groove in the middle; the inner end face of the inner groove is a rounded surface.

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