Method for manufacturing and using a flexible tube infusion needle

Abstract

The present invention discloses a method for manufacturing and using a flexible tube infusion needle. The needle seat is pushed to the forefront so that there is a spacing of a pre-retreat distance that can be retreated between its rear end and the buckle. The tip of the needle tube extends out of the front end of the flexible catheter and exceeds a pre-retreat distance. The inner channel of the needle guard tube forms a bulge due to heat setting and is affected by the protrusion of the sealing ring, and an anti-retreat inner ring groove is formed in the needle guard tube. Before use, the extension tube is pulled backward to loosen and retreat the needle tube, and the tip of the needle tube and the tip of the flexible catheter are cooperated to form a suitable puncture section. Before the infusion needle is used for puncture, its extension tube needs to be pulled backward in advance, so that the needle seat and the needle tube move backward synchronously, making the needle seat loose from the catheter seat and the needle seat displace backward, and the needle tube and the flexible catheter also become loose to avoid jamming. The buckle remains on the catheter seat to limit the retreat distance of the needle seat, so that after displacement, the tip of the flexible catheter and the tip of the needle tube are just in a matching state suitable for puncture.

Description

Technical Field

[0001] The present invention relates to the technology of indwelling catheters, and particularly to a method for manufacturing and using a flexible infusion needle. Background Art

[0002] For traditional flexible infusion needles, before use, the needle handle of the needle seat is loosened by swinging it left and right. After successful puncture, the steel needle and the needle handle are withdrawn and discarded, which may cause the risk of infection during the disposal of the needle tip.

[0003] Currently, our company previously developed a flexible infusion needle in which the steel needle is retained in the needle protection tube after being withdrawn after puncture, which can achieve indwelling of the flexible tube and will not cause the risk of infection caused by discarding the needle tip. However, after this flexible infusion needle is placed for a period of time, its needle tube will be tightly clamped and stuck by the flexible catheter, and it needs to be loosened by shaking before use. However, the needle seat is located inside the needle protection tube and is connected to the extension tube at the rear end, and the operating end of the extension tube is relatively far from the connection part of the needle seat. It is impossible to loosen the needle seat and the needle tube through the flexible extension tube. If the buckle is removed and then pulled, it is very difficult to control the pulling distance. If too much is pulled, the tip of the needle tube will retreat inside the front end of the flexible catheter, and then it cannot be used for puncture. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a method for manufacturing and using a flexible infusion needle that can conveniently and quickly pre-loosen the needle tube to prevent jamming.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a method for manufacturing and using a flexible infusion needle, the flexible infusion needle includes a needle seat surrounded by a sealing ring, a needle tube fixed to the front end of the needle seat, an extension tube fixed to the rear of the needle seat, an infusion interface connected to the tail of the extension tube, a catheter seat sleeved outside the needle seat, a flexible catheter fixedly connected to the front end of the catheter seat and sleeved outside the needle tube, a needle protection tube fixedly connected to the catheter seat, and a buckle installed at the rear end of the catheter seat to block the backward movement of the needle seat. The method for manufacturing and using the flexible infusion needle includes the following steps: (1), pushing the needle seat to the frontmost position so that there is a pre-retreat distance between its rear end and the buckle, and the tip of the needle tube extends out of the front end of the flexible catheter and exceeds a pre-retreat distance; (2), heating and sterilizing the flexible infusion needle including the needle seat and the needle protection tube, and the protrusion of the sealing ring of the needle seat forms a bulge in the inner channel of the needle protection tube due to heat setting, so that the protrusion in the inner channel of the needle protection tube closely adheres to the sealing ring to form a non-retreat inner ring groove; (3), before use, pull the extension tube backward to make the needle seat and the needle tube retreat, and the sealing ring is forced to slide out of the non-retreat inner ring groove and retreat to the position where the buckle blocks the rear end of the needle seat, and the needle tube and the needle seat are loosened and move backward synchronously with the flexible catheter, and the tip of the needle tube and the tip of the flexible catheter cooperate to form a suitable puncture section.

[0006] As an improvement to the technical solution of the manufacturing and using method of the flexible tube infusion needle of the present invention, the outer periphery of the front end of the needle protection tube is fixedly bonded to the inner cavity of the catheter seat, and the outer side surface of a section of the needle protection tube corresponding to the sealing ring of the needle seat bulges and contacts the inner hole surface of the catheter seat, so as to make its size and function stable.

[0007] As an improvement to the technical solution of the manufacturing and using method of the flexible tube infusion needle of the present invention, the inner hole of the catheter seat is a stepped hole that expands backward and is transitioned by a ring inclined surface, so that there is a gap between the expanded part of the inner hole of the rear section of the catheter seat and the needle protection tube, and the sealing ring is pre-loosened and retracted to the expanded part of the inner hole.

[0008] As an improvement to the technical solution of the manufacturing and using method of the flexible tube infusion needle of the present invention, the catheter seat is provided with a guiding hole that axially slidably cooperates with the front end of the needle seat, and the length of its sliding cooperation is greater than a pre-retreat distance.

[0009] As an improvement to the technical solution of the manufacturing and using method of the flexible tube infusion needle of the present invention, the front end of the needle seat is provided with a first platform position, and the guiding hole of the catheter seat is provided with a second platform position adapted to the first platform position.

[0010] The beneficial effect of the present invention is that when manufacturing the flexible tube infusion needle, the needle seat is pushed to the forefront, so that there is a spacing of a pre-retreat distance between the rear end of the needle seat and the buckle, and the tip of the needle tube protruding from the front end of the flexible tube also increases a pre-retreat distance. Before using and puncturing the infusion needle, it is necessary to pull the extension tube backward in advance, so that the needle seat and the needle tube move backward synchronously, causing looseness between the needle seat and the catheter seat and the needle seat to displace backward, and looseness also occurs between the needle tube and the flexible tube to avoid jamming. The buckle remains in the catheter seat to limit the backward retreat distance of the needle seat, so that after displacement, the tips of the flexible tube and the needle tube are just in a matching state suitable for puncture. Description of the Drawings

[0011] Figure 1 It is a three-dimensional structural schematic diagram of a flexible tube infusion needle needle seat before pre-loosening and backward retreat and its partial enlarged view in the present invention.

[0012] Figure 2 For Figure 1 The front structural schematic diagram of the flexible tube infusion needle shown and its partial enlarged view.

[0013] Figure 3 For Figure 1 The front structural schematic diagram of the flexible tube infusion needle in the state of termination of pre-loosening and backward retreat of the needle seat shown and its partial enlarged view.

[0014] Figure 4 It is a partial side sectional structural schematic diagram of the flexible tube infusion needle needle seat before pre-loosening and backward retreat.

[0015] Figure 5 is Figure 4 a schematic partial cross-sectional view of the lateral structure of the needle holder of the shown flexible tube infusion needle in the terminated state of pre-loosening and retracting backward. Specific embodiments

[0016] The following further illustrates the specific embodiments of the present invention with reference to the accompanying drawings.

[0017] Such as Figure 1 、 Figure 2 、 Figure 3The structural schematic diagram of the flexible tube infusion needle in the present invention is shown. A method for manufacturing and using a flexible tube infusion needle of the present invention, the flexible tube infusion needle includes a needle seat 21 around which a sealing ring 22 is provided, a needle tube 11 fixed to the front end of the needle seat 21, an extension tube 23 fixed to the rear end of the needle seat 21, an infusion interface 36 connected to the tail of the extension tube, a catheter seat 13 sleeved outside the needle seat 21, a flexible catheter 12 fixedly connected to the front end of the catheter seat 13 and sleeved outside the needle tube 11, a needle protection tube 16 fixedly connected to the catheter seat 13, a buckle 19 clamped at the rear end of the catheter seat 13 to prevent the needle seat from retreating, a sheath 15 is sleeved outside the flexible catheter 12 and the needle tube 11. The method for manufacturing and using the flexible tube infusion needle includes the following steps: (1), Push the needle seat 21 to the foremost position so that there is a pre-retreat distance between its rear end and the buckle 19, and the space of this distance is the pre-loosening and retreating space 39, and the tip of the needle tube 11 extends out of the front end of the flexible catheter 12 and exceeds a pre-retreat distance; (2), Heat-sterilize the flexible tube infusion needle including the needle seat 21 and the needle protection tube 16. The protrusion of the sealing ring 22 of the needle seat 21 forms a bulge in the inner channel of the needle protection tube 16 due to heat setting and is affected by the protrusion of the sealing ring, so that the protrusion in the inner channel of the needle protection tube closely adheres to the sealing ring 22 to form a non-retreat inner ring groove 18; (3), Before use, pull the extension tube 23 backward, so that the needle seat 21 and the needle tube 11 retreat, and the sealing ring 22 is forced to slide out of the non-retreat inner ring groove 18, and retreat to the tail end of the buckle blocking the needle seat 21, and the needle tube 11 and the needle seat 21 are loosened and move backward synchronously with the flexible catheter 12, and the tip of the needle tube 11 and the tip of the flexible catheter 12 are matched to form a suitable puncture section. When manufacturing the flexible tube infusion needle, push the needle seat 21 to the foremost position so that there is a pre-retreat distance between the rear end of the needle seat 21 and the buckle 19, and the tip of the needle tube 11 extends out of the front end of the flexible catheter 12 and also increases a pre-retreat distance. Among them, the non-retreat inner ring groove 18 keeps the needle seat 21 and the catheter seat 13 in a stable relative position, and protects the needle tube 11 and the needle seat 21 from relative displacement during operations such as packaging and transportation. Before the infusion needle is used for puncture, it is necessary to pull the extension tube 23 backward in advance, so that the needle seat 21 and the needle tube 11 move backward synchronously, so that there is looseness between the needle seat 21 and the catheter seat 13 and the needle seat 21 generates a displacement backward. At the same time, there is also looseness between the needle tube 11 and the flexible catheter 12 and the needle tube 11 generates a displacement backward, so as to avoid the needle tube 11 being tightly held and stuck by the flexible catheter 12, and a spacer space 38 is generated between the front end of the needle seat 21 and the catheter seat 13. During puncture, the buckle 19 still remains on the catheter seat 13, so that the retreat distance of the needle seat 21 can be limited. After the needle seat 21 and the needle tube 11 generate displacement, the tip of the flexible catheter 12 and the tip of the needle tube 11 are just in a suitable puncture fit state, that is, the tip of the needle tube extends out of the tip of the flexible catheter 12 by a suitable length.

[0018] Among them, the outer periphery of the front end of the needle protection tube 16 is fixedly bonded to the inner cavity of the catheter base 13, so that the needle protection tube 16 is fixedly connected to the catheter base 13. The outer side of a section of the needle protection tube 16 corresponding to the sealing ring 22 of the needle base 21 bulges and contacts the inner hole surface of the catheter base 13. When the product is sterilized, it is heat-set by heat, so that its size and function are stable.

[0019] Furthermore, the inner hole of the catheter base 13 is a stepped hole that expands backward and is transitioned by a ring inclined surface 32, so that there is a gap between the enlarged part of the inner hole of the rear section of the catheter base 13 and the needle protection tube 16, and the sealing ring 22 is pre-loosened and retracted to move to the enlarged part of the inner hole. When the extension tube 23 is pulled backward, the needle base 21 retreats, causing the sealing ring 22 to slide over the ring inclined surface 32, and the sealing ring 22 moves to a position with a gap and the tail of the needle base 21 is blocked by the buckle 19. The gap between the enlarged part of the inner hole of the rear section of the catheter base 13 and the needle protection tube 16 allows the needle protection tube to expand freely, thereby reducing the resistance during the backward pull and avoiding the problem of excessive starting force during pre-loosening.

[0020] Among them, the catheter base 13 is provided with a guiding hole 31 that axially slides and cooperates with the front end of the needle base 21, and the sliding cooperation length is greater than a pre-retreat distance. It is more appropriate to set the sliding cooperation length to about twice the pre-retreat distance, so that after the pre-loosening and retreating ends, the front end of the needle base 21 only retreats about half. Although the needle base 21 retreats to form an interval space 38, the needle base 21 still maintains a stable cooperation with the catheter base 13, so that the tip direction of the needle tube 11 at the front end of the needle base 21 will not swing left and right, thus ensuring the stable puncture of the tip inclined surface of the needle tube 11.

[0021] Furthermore, as Figure 4 、 Figure 5 shown, the front end of the needle base 21 is provided with a first platform 33 formed by reducing the material. The guiding hole 31 of the catheter base 13 is provided with a second platform 34 adapted to the first platform 33. The first platform 33 and the second platform 34 are arranged along the axis of the needle base, so that the front end of the needle base 21 can be axially slid and installed with the guiding hole 31. Thus, it can be ensured that the front end of the needle base 21 does not completely withdraw from the guiding hole 31 when the pre-loosening and retreating ends, and still maintains an anti-rotation cooperation relationship, so that the tip inclined surface of the needle tube 11 at the front end of the needle base 21 does not rotate, thereby ensuring the direction between the inclined surface at the front end of the needle tube 11 and the catheter base 13, and ensuring that the tip direction does not change during the puncture process, which is convenient for completing the puncture process.

[0022] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A manufacturing and using method of a flexible tube infusion needle, the flexible tube infusion needle comprising a needle seat around which a sealing ring is provided, a needle tube fixed to the front end of the needle seat, an extension tube fixed to the rear of the needle seat, an infusion interface connected to the tail of the extension tube, a catheter seat sleeved outside the needle seat, a flexible catheter fixedly connected to the front end of the catheter seat and sleeved outside the needle tube, a needle guard tube fixedly connected to the catheter seat, and a buckle clamped to the rear end of the catheter seat to prevent the needle seat from retreating. Characterized in that: The manufacturing and using method of the flexible tube infusion needle comprises the following steps. S1: Push the needle seat to the foremost position so that there is a spacing for a pre-retreat distance that can retreat between its rear end and the buckle, and the tip of the needle tube extends out of the front end of the flexible catheter and exceeds a pre-retreat distance; S2: Heat-sterilize the flexible tube infusion needle including the needle seat and the needle guard tube. The protrusion of the sealing ring of the needle seat forms a bulge in the inner channel of the needle guard tube due to heat setting, so that the inner channel of the needle guard tube is tightly pressed against the sealing ring to form an anti-retreat inner ring groove; S3: Before use, pull the extension tube backward so that the needle seat and the needle tube retreat and the sealing ring is forced to slide out of the anti-retreat inner ring groove, and retreat to the position where the buckle blocks the rear end of the needle seat. And the needle tube and the needle seat are loosened and move backward synchronously with the flexible catheter, and the tip of the needle tube and the tip of the flexible catheter are matched to form a suitable puncture section; When manufacturing the flexible tube infusion needle, push the needle seat to the foremost position so that there is a spacing for a pre-retreat distance between the rear end of the needle seat and the buckle, and the tip of the needle tube extends out of the front end of the flexible catheter and also increases a pre-retreat distance; Before the infusion needle is used for puncture, it is necessary to pull its extension tube backward in advance so that the needle seat and the needle tube move backward synchronously, causing looseness between the needle seat and the catheter seat and displacement of the needle seat backward, and also causing looseness between the needle tube and the flexible catheter to avoid jamming; The buckle remains on the catheter seat to limit the retreat distance of the needle seat, so that after displacement, the tip of the flexible catheter and the tip of the needle tube are just matched in a suitable puncture state.

2. The manufacturing and using method of the flexible tube infusion needle according to claim 1, Characterized in that: The outer periphery of the front end of the needle guard tube is fixedly bonded to the inner cavity of the catheter seat, and the outer side surface of a section of the needle guard tube corresponding to the sealing ring of the needle seat bulges and contacts the inner hole surface of the catheter seat, so as to make its size and function stable.

3. The manufacturing and using method of the flexible tube infusion needle according to claim 2, Characterized in that: The inner hole of the catheter seat is a stepped hole that expands backward and is transitioned by an annular inclined surface, so that there is a gap between the enlarged part of the inner hole of the rear section of the catheter seat and the needle guard tube, and the sealing ring is pre-loosened and retreats to the enlarged part of the inner hole.

4. The manufacturing and using method of the flexible tube infusion needle according to claim 1, Characterized in that: The catheter seat is provided with a guiding hole that axially slidably cooperates with the front end of the needle seat, and the sliding cooperation length is greater than a pre-retreat distance.

5. The manufacturing and using method of the flexible tube infusion needle according to claim 4, Characterized in that: The front end of the needle seat is provided with a first platform position, and the guiding hole of the catheter seat is provided with a second platform position adapted to the first platform position.

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