Self-sealing intravenous indwelling needle and production method thereof

Abstract

The present invention belongs to the technical field of indwelling needles, specifically a self-sealing intravenous indwelling needle and a production method thereof, comprising a centralized lumen, an indwelling tube, a puncture steel needle, a handle, a connecting tube and an external closed joint, wherein the indwelling tube is connected to the left side of the centralized lumen, the puncture steel needle is inserted into the indwelling tube, and the left end of the puncture steel needle extends to the left side of the indwelling tube. The production method of the self-sealing intravenous indwelling needle has the following specific steps: S1: the centralized lumen, the indwelling tube, the self-sealing liquid storage bag, the connecting tube and the external closed joint are integrally injection molded using medical plastics; a good tube sealing effect is achieved; through the provision of the self-sealing liquid storage bag, during infusion, the interior of the self-sealing liquid storage bag is filled with physiological saline, and when blood flows back into the indwelling tube, the blood is reintroduced into the blood vessel by squeezing out the physiological saline inside the self-sealing liquid storage bag, and the physiological saline fills the centralized lumen and the indwelling tube, thereby preventing the blood from flowing back easily.

Description

Technical Field

[0001] The invention relates to the technical field of indwelling needles, in particular to a self-sealing intravenous indwelling needle and a production method thereof. Background Art

[0002] The use of intravenous catheters can reduce the pain caused by repeated intravenous punctures and the fear of injections in children, reduce the anxiety of parents, facilitate clinical medication, emergency and critically ill patients, reduce the workload of nurses, and reduce the pain of children. Therefore, intravenous catheters are widely used in clinical practice. Faced with this special group of children, the length of time the intravenous catheter is retained and the comfort of the children become the most concerned issues for nurses and parents, and are also the signs of the successful use of intravenous catheters and the prerequisite for their promotion.

[0003] The intravenous catheter does not need to be removed after the infusion is completed and will be used for the next infusion. After the infusion is stopped, the catheter will be blocked due to venous blood return. Therefore, there has always been controversy over the length of retention time. The health administrative departments, hospital quality control departments and catheter manufacturers all advocate that the retention time should not exceed 3-4 days.

[0004] The blockage of intravenous catheters is caused by blood flowing back into the catheter lumen. Platelets and other coagulation substances in the blood coagulate and form thrombi in the low-flow catheter, thus blocking the tube. In order to ensure that the catheter can be reused, sealing technology must be used to prevent tube blockage. "Sealing" has become a special term in medicine and nursing.

[0005] Existing sealing methods are poorly operated and are usually one-way sealing, which is not very safe. Summary of the invention

[0006] The purpose of the present invention is to provide a self-sealing intravenous indwelling needle and a production method thereof, so as to solve the problem that the existing sealing method proposed in the above background technology is poor in operation and is usually a kind of sealing method, which is not safe.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a self-sealing intravenous indwelling needle, comprising a centralized lumen, an indwelling tube, a puncture steel needle, a handle, a connecting tube and an external closed joint, the indwelling tube is connected to the left side of the centralized lumen, the puncture steel needle is inserted in the indwelling tube, the left end of the puncture steel needle extends to the left side of the indwelling tube, the right end of the puncture steel needle extends to the right side of the centralized lumen, the right end of the puncture steel needle is connected with the handle, the left end of the indwelling tube is provided with a soft flat tube head, the bottom of the centralized lumen is connected with a self-sealing liquid storage bag, the self-sealing liquid storage bag is communicated with the inner cavity of the centralized lumen, the inner cavity of the centralized lumen is provided with a closed rubber block, the closed rubber block is located on the right side of the self-sealing liquid storage bag, the puncture steel needle passes through the closed rubber block, the upper surface of the centralized lumen is connected with a connecting tube, the connecting tube is communicated with the inner cavity of the centralized lumen, and the other end of the connecting tube is connected with an external closed joint.

[0008] Preferably, the centralized lumen, the indwelling tube, the self-sealing liquid storage bag, the connecting tube and the external sealing joint are integrally injection-molded.

[0009] Preferably, the soft flat tube head is a rubber soft flat tube head, and the thickness of the soft flat tube head is 1 / 6-1 / 3 of the wall thickness of the indwelling tube.

[0010] Preferably, the initial state of the self-sealing liquid storage bag is a flat shape with the internal air extracted.

[0011] Preferably, two limit retaining rings are provided on the right side of the inner cavity of the central lumen and on the right side of the self-sealing liquid storage bag, and the sealing rubber block is clamped between the two limit retaining rings.

[0012] Preferably, the right side wall of the right limit retaining ring is inclined to the left.

[0013] Preferably, the external closed joint includes an inner sleeve and a sealing cover threaded on the top of the inner sleeve, the bottom end of the inner sleeve is connected to the connecting pipe, a through groove is provided in the middle of the sealing cover, and a rubber plug is provided in the inner cavity of the inner sleeve.

[0014] A method for producing a self-sealing intravenous indwelling needle, the specific steps of the method for producing the self-sealing intravenous indwelling needle are as follows:

[0015] S1: The centralized lumen, indwelling tube, self-sealing liquid storage bag, connecting tube and external sealing joint are integrally injection molded by medical plastics;

[0016] Check the connectivity of the central lumen, indwelling tube, self-sealing liquid storage bag, connecting tube and external sealing joint connection position, discard those that are not connected, and proceed to the next step if they are normally connected;

[0017] S2: Hot-melt the handle onto the puncture needle and embed a closed rubber block between the two limit rings;

[0018] S3: Disinfect each structure in steps S1 and S2, insert the puncture needle into the closed rubber block, and then seal the self-sealing intravenous indwelling needle.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The soft flat tube head has a check function, which prevents blood from flowing back into the indwelling tube and plays a good role in sealing the tube;

[0021] 2) Through the setting of the self-sealing liquid storage bag, during infusion, the interior of the self-sealing liquid storage bag is filled with physiological saline. When blood flows back into the indwelling tube, the blood is reintroduced into the blood vessel by squeezing out the physiological saline inside the self-sealing liquid storage bag. The physiological saline fills the centralized lumen and the indwelling tube, thereby preventing the blood from flowing back easily. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the puncture needle of the present invention being pulled out and separated from the indwelling tube;

[0024] Figure 3 This is a schematic diagram of the internal structure of the concentrated lumen of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the external closed joint of the present invention.

[0026] In the figure: 1 centralized lumen, 2 indwelling tube, 3 handle, 4 puncture needle, 5 soft flat tube head, 6 self-sealing liquid storage bag, 7 limit retaining ring, 8 sealing rubber block, 9 connecting tube, 10 external sealing joint, 101 inner sleeve, 102 sealing cover, 103 through groove, 104 rubber plug. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] Example:

[0030] See also Figure 1-4 The present invention provides a technical solution: a self-sealing intravenous indwelling needle, comprising a centralized lumen 1, an indwelling tube 2, a puncture steel needle 4, a handle 3, a connecting tube 9 and an external closed joint 10, wherein the indwelling tube 2 is connected to the left side of the centralized lumen 1, the puncture steel needle 4 is inserted into the indwelling tube 2, the left end of the puncture steel needle 4 extends to the left side of the indwelling tube 2, the right end of the puncture steel needle 4 extends to the right side of the centralized lumen 1, the right end of the puncture steel needle 4 is connected to the handle 3, and the left end of the indwelling tube 2 is provided with There is a soft flat tube head 5, the bottom of the concentrated tube cavity 1 is connected to a self-sealing liquid storage bag 6, the self-sealing liquid storage bag 6 is communicated with the inner cavity of the concentrated tube cavity 1, the inner cavity of the concentrated tube cavity 1 is provided with a closed rubber block 8, the closed rubber block 8 is located on the right side of the self-sealing liquid storage bag 6, the puncture steel needle 4 passes through the closed rubber block 8, the upper surface of the concentrated tube cavity 1 is connected to a connecting tube 9, the connecting tube 9 is communicated with the inner cavity of the concentrated tube cavity 1, and the other end of the connecting tube 9 is connected to an external closed joint 10.

[0031] Furthermore, the centralized lumen 1, the indwelling tube 2, the self-sealing liquid storage bag 6, the connecting tube 9 and the external sealing joint 10 are integrally injection-molded.

[0032] Furthermore, the soft flat tube head 5 is a rubber soft flat tube head, and the thickness of the soft flat tube head 5 is 1 / 6-1 / 3 of the wall thickness of the indwelling tube 2 .

[0033] Furthermore, the initial state of the self-sealing liquid storage bag 6 is a flat shape with the internal air extracted.

[0034] Furthermore, two limit retaining rings 7 are provided on the right side of the inner cavity of the central lumen 1 and on the right side of the self-sealing liquid storage bag 6 , and the sealing rubber block 8 is clamped between the two limit retaining rings 7 .

[0035] Furthermore, the right side wall of the right limit stop ring 7 is inclined to the left.

[0036] Furthermore, the external closed joint 10 includes an inner sleeve 101 and a cover 102 screwed to the top of the inner sleeve 101, the bottom end of the inner sleeve 101 is connected to the connecting pipe 9, a through groove 103 is opened in the middle of the cover 102, and a rubber plug 104 is provided in the inner cavity of the inner sleeve 101.

[0037] A method for producing a self-sealing intravenous indwelling needle, the specific steps of the method for producing the self-sealing intravenous indwelling needle are as follows:

[0038] S1: The centralized lumen 1, the indwelling tube 2, the self-sealing liquid storage bag 6, the connecting tube 9 and the external sealing joint 10 are integrally injection-molded by using medical plastics;

[0039] Check the connection status of the central lumen 1, the indwelling tube 2, the self-sealing liquid storage bag 6, the connecting tube 9 and the external sealing joint 10. If it is not connected, it will be discarded, and if it is normally connected, it will proceed to the next step;

[0040] S2: hot-melt the handle 3 onto the puncture needle 4, and embed the sealing rubber block 8 between the two limit rings 7;

[0041] S3: Sterilize each structure in steps S1 and S2, insert the puncture needle 4 into the sealing rubber block 8, and then seal the self-sealing intravenous indwelling needle.

[0042] When in use, the central lumen 1 and the handle 3 are held to insert the puncture steel needle 4 in connection with the indwelling tube 2 into the blood vessel, and then the puncture steel needle 4 is pulled out from the indwelling tube 2 through the handle 3;

[0043] By setting the sealing rubber block 8, the right side of the central lumen 1 is still in a sealed state after the puncture needle 4 is withdrawn;

[0044] During infusion, the infusion needle is passed through the through groove 103 and the rubber stopper 104 and connected to the connecting tube 9. The medicine enters the human blood vessels through the connecting tube 9, the centralized lumen 1, the indwelling tube 2, and the soft flat tube head 5 to achieve the infusion effect. After the infusion, the infusion needle can be pulled out from the external closed joint 10. The position of the external closed joint 10 is closed by the setting of the rubber stopper 104.

[0045] The soft flat tube head 5 is subjected to the action of blood pressure in the blood vessel, so that the soft flat tube head 5 is in a closed state, and the infusion medicine flushes the soft flat tube head 5 open, so that the medicine enters the blood vessel;

[0046] When no infusion is performed, the soft flat tube head 5 returns to a closed state;

[0047] When blood breaks through the protection of the soft flat tube head 5 and enters the indwelling tube 2 and the concentrated lumen 1, the medicine in the self-sealing liquid storage bag 6 is squeezed out and the blood in the concentrated lumen 1 and the indwelling tube 2 is squeezed out and flows back into the blood vessel. When the medicine in the self-sealing liquid storage bag 6 is an infusion, physiological saline and medicine are filled in.

[0048] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-sealing intravenous indwelling needle, comprising a central lumen (1), an indwelling tube (2), a puncture needle (4), a handle (3), a connecting tube (9) and an external sealing joint (10), characterized in that: The indwelling tube (2) is connected to the left side of the central lumen (1), the puncture steel needle (4) is inserted into the indwelling tube (2), the left end of the puncture steel needle (4) extends to the left side of the indwelling tube (2), the right end of the puncture steel needle (4) extends to the right side of the central lumen (1), the right end of the puncture steel needle (4) is connected to a handle (3), the left end of the indwelling tube (2) is provided with a soft flat tube head (5), and the bottom of the central lumen (1) is connected to a self-sealing liquid storage bag (6). The self-sealing liquid storage bag (6) is connected to the inner cavity of the central lumen (1); the inner cavity of the central lumen (1) is provided with a sealing rubber block (8); the sealing rubber block (8) is located on the right side of the self-sealing liquid storage bag (6); the puncture steel needle (4) penetrates the sealing rubber block (8); the upper surface of the central lumen (1) is connected to a connecting tube (9); the connecting tube (9) is connected to the inner cavity of the central lumen (1); the other end of the connecting tube (9) is connected to an external sealing joint (10); The centralized lumen (1), the indwelling tube (2), the self-sealing liquid storage bag (6), the connecting tube (9) and the external sealing joint (10) are integrally injection-molded; The soft flat tube head (5) is a rubber soft flat tube head, and the thickness of the soft flat tube head (5) is 1 / 6 to 1 / 3 of the wall thickness of the indwelling tube (2).

2. A self-sealing intravenous indwelling needle according to claim 1, characterized in that: The initial state of the self-sealing liquid storage bag (6) is a flat state with the air inside it extracted.

3. A self-sealing intravenous indwelling needle according to claim 1, characterized in that: Two limit retaining rings (7) are arranged on the right side of the inner cavity of the central lumen (1) and on the right side of the self-sealing liquid storage bag (6), and the sealing rubber block (8) is clamped between the two limit retaining rings (7).

4. A self-sealing intravenous indwelling needle according to claim 3, characterized in that: The right side wall of the right limit retaining ring (7) is in an inclined shape recessed to the left.

5. The self-sealing intravenous indwelling needle according to claim 1, characterized in that: The external closed joint (10) comprises an inner sleeve (101) and a sealing cover (102) threadedly connected to the top end of the inner sleeve (101); the bottom end of the inner sleeve (101) is connected to the connecting pipe (9); a through groove (103) is provided in the middle of the sealing cover (102); and a rubber plug (104) is provided in the inner cavity of the inner sleeve (101).

6. A method for producing a self-sealing intravenous indwelling needle according to any one of claims 1 to 5, characterized in that: The specific steps of the production method of the self-sealing intravenous indwelling needle are as follows: S1: The centralized lumen (1), the indwelling tube (2), the self-sealing liquid storage bag (6), the connecting tube (9) and the external sealing joint (10) are integrally injection-molded using medical plastics; Checking the connectivity of the connection positions of the central lumen (1), the indwelling tube (2), the self-sealing liquid storage bag (6), the connecting tube (9) and the external sealing joint (10); discarding those that are not connected, and proceeding to the next step if they are normally connected; S2: hot-melt the handle (3) onto the puncture needle (4), and embed a sealing rubber block (8) between two limit retaining rings (7); S3: sterilize each structure in steps S1 and S2, insert the puncture needle (4) into the sealing rubber block (8), and then seal the self-sealing intravenous indwelling needle.

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