Extension catheter for blood transfusion

Abstract

The invention discloses an extended catheter for blood transfusion, which belongs to the technical field of medical supplies and comprises a catheter body, a puncture needle head and a blood transfusion needle connector assembly. The puncture needle head is communicated with the front end of the catheter body, and the blood transfusion needle connector assembly is communicated with the rear end of the catheter body. The catheter body is provided with a blood transfusion switch valve close to the front end part; the blood transfusion needle connector assembly comprises a blood transfusion needle cannula and a residual liquid drainage guide column tube, the residual liquid drainage guide column tube is sleeved at the end of the catheter body, a drainage guide cavity is formed in the residual liquid drainage guide column tube and provided with an exhaust hole, the blood transfusion needle cannula forms a conical structure with the top end extending into the inner side of the end of the catheter body, and a puncture plug is arranged at the top end of the blood transfusion needle cannula. A drainage and guide annular space is formed between the outer wall of the blood transfusion needle cannula and the inner wall of the catheter body and communicated with a drainage and guide cavity arranged on the residual liquid drainage and guide column pipe in a sleeving mode. The extension catheter for blood transfusion not only improves the safety, sanitation and reliability of blood transfusion operation, but also optimizes the operation experience of medical staff, and has remarkable clinical application value.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical supplies, and particularly relates to an extension catheter for blood transfusion. Background Art

[0002] During blood transfusion, preventing blood spillage is of great significance. It not only relates to the life safety and treatment effect of patients, but also directly affects the safety of medical operations and environmental hygiene. If blood spills, it will not only cause waste of precious blood resources and affect the accuracy of the blood transfusion dose, but also may lead to cross-infection, contamination of medical devices and work areas, and increase the occupational exposure risk of medical staff. Therefore, taking effective measures to prevent blood spillage during blood transfusion is a key link to ensure medical quality, protect the safety of doctors and patients, and maintain a clean medical environment.

[0003] Currently, the commonly used blood transfusion sets in clinics usually connect by directly inserting the puncture head into the blood bag interface. Although this structure is simple, there are many hidden dangers and deficiencies in the actual operation process. First of all, when the puncture head of the blood transfusion set is pulled out from the blood bag interface, often due to negative pressure, resilience or improper operation and other reasons, the residual blood in the blood bag overflows along the puncture port, which not only causes blood waste, but also easily contaminates the operation area. Secondly, the blood spillage may contact the skin of medical staff or the working surface, increasing the risk of blood-borne disease transmission and occupational exposure. In addition, once the blood contaminates the blood transfusion area, it may also pose a threat to the aseptic requirements of the blood transfusion process, affecting the safety and effectiveness of treatment. Therefore, the existing blood transfusion connection methods still have obvious deficiencies in terms of blood tightness, operation convenience and occupational protection. To solve the above problems, it is particularly necessary to design a blood transfusion extension tube structure with good tightness and operation convenience. Summary of the Invention

[0004] In view of the problems that the puncture head of the existing blood transfusion set is prone to cause blood spillage during the extraction process, which in turn leads to blood waste, contamination of the operation area and increased occupational exposure risk, etc., the present invention provides an extension catheter for blood transfusion.

[0005] The present invention is implemented as follows. An extension catheter for blood transfusion, characterized in that it includes a catheter body, a puncture needle and a blood transfusion needle connector assembly; the catheter body forms a flexible tube for conducting blood, the puncture needle is connected to the front end of the catheter body, and the blood transfusion needle connector assembly is communicated with the rear end of the catheter body; the catheter body is provided with a blood transfusion switch valve near the front end; the blood transfusion needle connector assembly includes a blood transfusion needle cannula and a residual liquid drainage column tube, the residual liquid drainage column tube is sleeved on the end of the catheter body and forms a drainage cavity inside, the drainage cavity is provided with an openable and closable exhaust hole, the blood transfusion needle cannula forms a conical structure with the top extending into the inner side of the end of the catheter body, the top of the blood transfusion needle cannula is provided with a puncture plug, and a drainage annular gap is formed between the outer wall of the blood transfusion needle cannula and the inner wall of the catheter body, and the drainage annular gap is communicated with the drainage cavity sleeved on the residual liquid drainage column tube.

[0006] In the above technical solution, preferably, it includes a static pressure flow director and an exhaust pipe. The static pressure flow director is connected in series to the catheter body. The static pressure flow director includes a drip chamber connected in series to the catheter body. The pipe joint connecting the catheter body to the upper part of the drip chamber extends into the drip chamber to form a liquid dripping port. The exhaust pipe is communicated with the catheter body and is provided with an exhaust port at the end, and the exhaust pipe is installed with an exhaust switch valve.

[0007] In the above technical solution, preferably, the drainage cavity is formed in an annular space around the end of the catheter body, and the exhaust hole is arranged at the upper part of the drainage cavity; the drainage annular gap is formed inside the end of the catheter body.

[0008] In the above technical solution, preferably, the exhaust hole is arranged on the upper end surface of the residual liquid drainage column tube. The upper end of the residual liquid drainage column tube is installed with a sealing cover through a thread. The upper part of the sealing cover is a cover part for blocking the exhaust hole, and the side part of the sealing cover is a sleeve part threadedly connected to the residual liquid drainage column tube. The sleeve part is provided with a vent hole. When a gap is formed between the cover part and the upper end surface of the residual liquid drainage column tube, the vent hole is communicated with the exhaust hole.

[0009] In the above technical solution, preferably, a breathable filler with a liquid absorption function is arranged in the drainage cavity.

[0010] In the above technical solution, preferably, the height of the top of the blood transfusion needle cannula extending into the catheter body is higher than the upper end of the residual liquid drainage column tube.

[0011] In the above technical solution, preferably, the residual liquid drainage column tube is composed of an inner sleeve part, an upper cover part and an outer sleeve part. The drainage cavity is formed between the inner sleeve part and the outer sleeve part. The lower end of the catheter body is inserted and connected to the inner sleeve part, and the exhaust hole is arranged on the upper cover part; the outer sleeve part is threadedly connected to the sealing cover.

[0012] In the above technical solution, preferably, a sealing ring is provided between the sealing sleeve cover and the upper cover part.

[0013] In the above technical solution, preferably, the lower end of the blood transfusion needle cannula forms a flared structure, and the flared structure of the blood transfusion needle cannula is connected to a terminal sleeve part extending outward, and the terminal sleeve part is sleeved and fixed with the outer sleeve part of the residual liquid drainage column tube.

[0014] This extended catheter for blood transfusion incorporates a number of innovative technical features in its structural design, can effectively overcome the defects existing in the connection methods of existing blood transfusion devices, and has various advantages and remarkable usage effects.

[0015] First of all, by providing the catheter body, the safe diversion of blood between the blood bag and the blood transfusion device is realized, making the entire blood transfusion path more flexible and reducing the risk of misoperation caused by limited operating space. Secondly, a puncture needle is provided at the front end of the catheter body to ensure a sealed connection with the blood bag interface, improving the reliability and stability of the initial connection. At the same time, the blood transfusion switch valve provided near the front end can manually close the blood passage when connecting or disconnecting the blood transfusion device, preventing blood backflow and spillage, and further ensuring the cleanliness and safety of the operation process.

[0016] At the rear end of the extension tube, a better connection performance and residual liquid treatment effect are achieved through the uniquely designed blood transfusion needle joint assembly. Among them, the conical structure of the blood transfusion needle cannula facilitates the stable insertion of the puncture needle of the blood transfusion device; the drainage annular gap between the cannula and the inner wall of the catheter body communicates with the drainage cavity formed in the residual liquid drainage column tube, and the residual blood can be effectively drained and collected through the exhaust hole of the drainage cavity before the end of blood transfusion or the removal of the puncture needle, thus significantly reducing the risk of blood spillage, keeping the operation area clean, and reducing the possibility of occupational exposure of medical staff.

[0017] In addition, the structural components of this extension tube cooperate closely with each other, the overall structure is compact, it is applicable to blood bags and blood transfusion devices of different specifications, has good versatility and convenience, and is suitable for popularization and application in various clinical blood transfusion scenarios. Generally speaking, this extended catheter for blood transfusion not only improves the safety, hygiene and reliability of blood transfusion operations, but also optimizes the operation experience of medical staff, and has significant clinical application value. Brief Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is a schematic structural diagram of the blood transfusion needle joint assembly of the present invention. Detailed Description of the Invention

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] To solve the problems that the puncture head of the existing blood transfusion set is prone to cause blood spillage during the extraction process, which in turn leads to blood waste, pollution of the operation area, and an increased risk of occupational exposure, etc., the present invention specifically provides an extension catheter for blood transfusion. To further illustrate the structure of the present invention, it is described in detail below in conjunction with the drawings:

[0022] Please refer to Figure 1 , an extension catheter for blood transfusion, comprising a catheter body 1, a puncture needle 2, a static pressure flow director 3, an exhaust pipe 4, and a blood transfusion needle adapter assembly 5.

[0023] The catheter body forms a flexible hose for conducting blood. The catheter body is the main conducting structure in the extension catheter for blood transfusion, and it is made of a medical-grade flexible hose material as a whole, preferably transparent or semi-transparent polyvinyl chloride (PVC), polyurethane (PU), or thermoplastic elastomer (TPE) material to ensure good flexibility, transparency, and biocompatibility.

[0024] The puncture needle is connected to the front end of the catheter body. The puncture needle is used to achieve a sealed connection with the blood bag outlet interface and is a key component for establishing a liquid path channel between the extension catheter for blood transfusion and the blood bag. The puncture needle is preferably made of medical-grade rigid plastic or stainless steel material, having a certain rigidity and strength to smoothly puncture the blood bag stopper and maintain a stable fixed state. The outer shape of the puncture needle is designed as a cone or an inclined plane, which is convenient for inserting into the blood bag interface and, at the same time, cooperates with the tight connection of the catheter body to ensure the tightness and smoothness of blood during blood transfusion.

[0025] The catheter body is provided with a blood transfusion switch valve 6 near the front end. The blood transfusion switch valve is arranged behind the puncture needle and is used to cut off the flow of blood in the blood bag into the catheter body. The blood transfusion switch valve, as a control element commonly used in blood transfusion instruments in the prior art, is usually installed at an appropriate position in the catheter system to manually control the on-off state of blood in the blood transfusion path. The common forms include a roller-type tube clamp valve, a knob-type valve, or a sliding-type push rod valve.

[0026] The static pressure flow director is serially arranged on the catheter body. The static pressure flow director includes a drip chamber serially connected to the catheter body. The pipe joint connecting the upper part of the catheter body extends into the inner side of the drip chamber to form a liquid dripping port. As a commonly used auxiliary control device in the existing blood transfusion and infusion systems, the static pressure flow director is mainly used to maintain and guide the unidirectional flow of liquid in the system, regulate the liquid flow rate, and prevent the flow disorder of the liquid caused by uneven static pressure or backflow. As a known existing structure, its structure includes a transparent drip chamber formed integrally. The upper end of the drip chamber is connected to the upstream catheter, and the lower end is communicated with the downstream catheter. The liquid drips into the drip chamber from top to bottom, and the flow rate can be visually judged and manually regulated through the dripping speed.

[0027] The exhaust pipe is communicated with the catheter body and an exhaust port is provided at the end. An exhaust switch valve 7 is installed on the exhaust pipe. The exhaust pipe forms a bypass branch pipe of the catheter body, and the exhaust switch valve is an existing control element. In this technical solution, the exhaust pipe serves as an auxiliary channel communicated with the catheter body, mainly used to timely remove the gas accumulated inside the catheter during blood transfusion, prevent the gas from entering the patient's body and causing the risk of air embolism, thereby improving the safety of the blood transfusion process. The end of the exhaust pipe is provided with an exhaust port and an exhaust switch valve is installed, which is convenient to flexibly open or close the exhaust channel according to actual needs. Before removing the blood transfusion needle, the open state of the exhaust pipe can also assist the residual blood around the end of the catheter to quickly enter the drainage cavity through the drainage annular gap, playing a role in accelerating the drainage of the residual blood and avoiding blood spillage. By setting the exhaust pipe, the fluid control ability and operation convenience of the entire blood transfusion system are effectively improved, and the cleanliness and controllability of the blood transfusion process are further ensured.

[0028] The blood transfusion needle connector assembly is communicated with the rear end of the catheter body.

[0029] Please refer to Figure 2 , the blood transfusion needle connector assembly includes a blood transfusion needle cannula 5-1 and a residual liquid drainage column tube 5-2. The residual liquid drainage column tube is sleeved on the end of the catheter body and a drainage cavity 5-3 is formed inside. The drainage cavity is provided with an openable and closable exhaust hole 5-4. The blood transfusion needle cannula forms a conical structure with the top extending into the inner side of the end of the catheter body. A puncture plug 5-5 is provided at the top of the blood transfusion needle cannula. A drainage annular gap 5-6 is formed between the outer wall of the blood transfusion needle cannula and the inner wall of the catheter body, and the drainage annular gap is communicated with the drainage cavity of the residual liquid drainage column tube. The lower end of the blood transfusion needle cannula is open, which is used to guide the insertion of the blood transfusion needle. Due to the design of its conical structure, after the blood transfusion is paused or completed, the residual blood at the end of the catheter body can be introduced into the drainage cavity from the drainage annular gap formed around it to remove the residual blood around its top, ensuring that the blood transfusion needle inserted at the top will not bring out the residual blood when the needle is removed.

[0030] In this embodiment, specifically, the residual liquid drainage column tube is composed of an inner sleeve part, an upper cover part, and an outer sleeve part. A drainage cavity is formed between the inner sleeve part and the outer sleeve part. The lower end part of the catheter body is sleeved and connected to the inner sleeve part. An exhaust hole is arranged on the upper cover part. The outer sleeve part is hermetically sleeved with a sealing cover 5-7 through a thread. A sealing ring 5-8 is arranged between the sealing cover and the upper cover part. The lower end part of the blood transfusion needle cannula forms a flared structure. The flared structure of the blood transfusion needle cannula is connected to a end sleeve part extending outward. The end sleeve part is fixedly sleeved with the outer sleeve part of the residual liquid drainage column tube. The residual liquid drainage column tube and the blood transfusion needle cannula are polycarbonate plastic parts, which have the characteristics of high transparency, high strength, not easy to break, and hard structure, facilitating the connection and assembly between various parts. And the blood transfusion needle cannula serves as a guiding tube for the insertion of the blood transfusion needle. The hardness of its inner wall is crucial for the use effect. If the hardness is insufficient, it is easy to form a great resistance to the insertion of the blood transfusion needle tip and cannot play a guiding role. Under the action of the hard and transparent blood transfusion needle cannula, the tip of the blood transfusion needle is inserted smoothly and can be observed. The puncture plug is a rubber plug, including a head and a plug-in part inserted at the top end of the blood transfusion needle cannula. The plug-in part and the top end of the blood needle cannula are elastically squeezed and plugged. The plug-in part of the puncture plug and the top end of the blood transfusion needle cannula are in interference fit, and heat bonding or an annular positioning rib can be selected to assist in limiting the position to enhance the structural stability. The puncture plug is used as a flexible seal for the insertion of the tip of the blood transfusion needle.

[0031] That is, a drainage cavity is formed in the annular space around the end of the catheter body, and the exhaust hole is arranged at the upper part of the drainage cavity; a drainage ring gap is formed inside the end of the catheter body. The exhaust hole is arranged on the upper end surface of the residual liquid drainage column tube. The upper end part of the residual liquid drainage column tube is installed with a sealing cover through a thread. The upper part of the sealing cover is a cover part for plugging the exhaust hole, and the side part of the sealing cover is a sleeve part connected to the residual liquid drainage column tube through a thread. The sleeve part is provided with a vent hole 5-9. When a gap is formed between the cover part and the upper end surface of the residual liquid drainage column tube, the vent hole is communicated with the exhaust hole.

[0032] A breathable filler 5-10 with a liquid absorption function is arranged in the drainage cavity. The breathable filler can be selected from medical porous foam materials. The setting of this breathable filler realizes the function of avoiding the residual blood flowing out of the exhaust hole due to the total inclination of the blood transfusion needle joint when the exhaust hole is opened through its liquid absorption function. That is, the breathable filler located below the exhaust hole provides a blood check and absorption function when the exhaust hole is opened.

[0033] The height of the top end of the blood transfusion needle cannula extending into the catheter body is higher than the upper end part of the residual liquid drainage column tube. The catheter body is a transparent flexible tube. This height difference design enables the direct observation of the residual blood situation around the top end of the blood transfusion needle cannula.

[0034] In this embodiment, the residual liquid drainage column tube, the catheter body, and the blood transfusion needle cannula are assembled together, which has the advantages of a firm structural connection and convenient assembly. The plug-in sleeve structure simplifies the manufacturing process, facilitates rapid assembly and standardized production, and helps reduce manufacturing costs. In addition, this connection method enables each component to use different materials suitable for its functional requirements, optimizing overall performance through a combination of soft and hard; and the plug-in interface is clear, which facilitates testing and quality control in the production process. Reasonable design of the plug-in fit can also effectively improve the sealing of the connection, further enhancing the safety and airtightness of the device during the blood transfusion process.

[0035] How to use this extension tube:

[0036] Insert the puncture needle into the blood transfusion bag, so that the upper end of the catheter body is connected to the blood bag. Insert the blood transfusion device needle into the blood transfusion needle cannula, so that the lower end of the blood transfusion device needle and the catheter body are connected. The exhaust switch valve is in the open state, and this extension tube can be used normally as a catheter between the blood bag and the blood transfusion device. When the blood transfusion device needle needs to be pulled out, close the blood transfusion switch valve, open the exhaust hole of the drainage cavity, and the residual blood around the blood transfusion device needle will flow into the drainage cavity through the drainage annular gap to empty the residual blood around the blood transfusion device needle. The conical structure combined with the annular gap structure is conducive to the rapid introduction of residual blood into the drainage cavity along the outer gap. At this time, pulling out the needle will not cause blood to flow out.

[0037] In this embodiment, the upper portion of the inner sleeve of the residual liquid drainage column is further provided with axially extending ribs 5-11. The ribs are circumferentially spaced apart to form circumferential grid-like gaps between the ribs, providing a structure with circumferential support rigidity. A sac 8 is formed at the lower end of the catheter body corresponding to the ribs. Before removing the transfusion needle, the exhaust valve is closed and the sac is pinched with fingers. The ribs within facilitate finger control of the end of the catheter body equipped with the transfusion needle connector assembly, facilitating needle removal. Furthermore, when the sac is pinched, residual blood is squeezed into the drainage cavity by the rapidly compressed gas, synergistically increasing the drainage rate of the residual blood with the needle removal action.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An extension catheter for blood transfusion, characterized in that: It includes a catheter body, a puncture needle head, and a blood transfusion needle connector assembly; the catheter body forms a flexible tube for conducting blood, the puncture needle head is connected to the front end of the catheter body, and the blood transfusion needle connector assembly is communicated with the rear end of the catheter body; the catheter body is provided with a blood transfusion switch valve near the front end; the blood transfusion needle connector assembly includes a blood transfusion needle cannula and a residual liquid drainage column tube, the residual liquid drainage column tube is sleeved on the end of the catheter body and forms a drainage cavity inside, the drainage cavity is provided with an openable and closable exhaust hole, the blood transfusion needle cannula forms a conical structure with the top end extending into the inner side of the end of the catheter body, the top end of the blood transfusion needle cannula is provided with a puncture plug, a drainage annular gap is formed between the outer wall of the blood transfusion needle cannula and the inner wall of the catheter body, and the drainage annular gap is communicated with the drainage cavity sleeved on the residual liquid drainage column tube.

2. The extended catheter for blood transfusion according to claim 1, wherein: It includes a static pressure flow director and an exhaust pipe, the static pressure flow director is connected in series to the catheter body, the static pressure flow director includes a drip funnel connected in series to the catheter body, a pipe joint connecting the catheter body to the upper part of the drip funnel extends into the drip funnel to form a liquid dripping port, the exhaust pipe is communicated with the catheter body and is provided with an exhaust port at the end, and the exhaust pipe is installed with an exhaust switch valve.

3. The extended catheter for blood transfusion according to claim 2, wherein: The drainage cavity is formed in an annular space around the end of the catheter body, and the exhaust hole is arranged at the upper part of the drainage cavity; the drainage annular gap is formed inside the end of the catheter body.

4. The extended catheter for blood transfusion according to claim 3, wherein: The exhaust hole is arranged on the upper end face of the residual liquid drainage column tube, the upper end of the residual liquid drainage column tube is installed with a sealing cover through a thread, the upper part of the sealing cover is a cover part for blocking the exhaust hole, the side part of the sealing cover is a sleeve part threadedly connected to the residual liquid drainage column tube, the sleeve part is provided with a ventilation hole, and when a gap is formed between the cover part and the upper end face of the residual liquid drainage column tube, the ventilation hole is communicated with the exhaust hole.

5. The extended catheter for blood transfusion according to claim 4, characterized in that: An air-permeable filler with a liquid absorption function is arranged in the drainage cavity.

6. The extended catheter for blood transfusion according to claim 5, characterized in that: The height of the top end of the blood transfusion needle cannula extending into the catheter body is higher than the upper end of the residual liquid drainage column tube.

7. The extended catheter for blood transfusion according to claim 6, characterized in that: The residual liquid drainage column tube is composed of an inner sleeve part, an upper cover part, and an outer sleeve part, the drainage cavity is formed between the inner sleeve part and the outer sleeve part, the lower end of the catheter body is inserted and connected to the inner sleeve part, and the exhaust hole is arranged on the upper cover part; the outer sleeve part is threadedly connected to the sealing cover.

8. The extended catheter for blood transfusion according to claim 7, characterized in that: A sealing ring is arranged between the sealing cover and the upper cover part.

9. The extended catheter for blood transfusion according to claim 8, characterized in that: The lower end of the blood transfusion needle cannula forms a flared structure, the flared structure of the blood transfusion needle cannula is connected to an end sleeve part extending outward, and the end sleeve part is fixedly sleeved with the outer sleeve part of the residual liquid drainage column tube.

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