Implantable infusion device needle

Abstract

The application discloses a needle for an implantable infusion device, comprising a bottom cover, a connecting assembly and a needle tube, the connecting assembly comprises a one-piece injection molded needle stick prevention base, a connecting arm and a connecting seat, the needle stick prevention base is fixedly arranged at the center of the bottom cover, one end of the connecting arm is fixedly connected to the top of the needle stick prevention base, the other end of the connecting arm is fixedly connected to the front end of the connecting seat, the tail end of the needle tube is arranged through the front end of the connecting seat, the front end of the needle tube is slidably arranged in the needle stick prevention base, the connecting arm can be folded and contracted in multiple sections to limit the moving position of the needle tube; in the initial state, the connecting arm is folded and contracted to the shortest length, at this time, the needle tip of the needle tube is arranged through the bottom of the needle stick prevention base, and at this time, it is the longest exposed distance of the needle tube; in the second state, the connecting arm is unfolded to the longest length, at this time, the needle tip of the needle tube is retracted and enclosed in the needle stick prevention base. The scheme is easy to manufacture and can ensure the safety in use.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically to a needle for an implantable infusion device. Background Technology

[0002] An implantable infusion device (IUI) is a fully implantable intravenous drug delivery system that is embedded in the human body. It includes a catheter inserted into a central vein, with the catheter tip connected to an injection port. The entire device is completely implanted under the skin, offering advantages such as long indwelling time and fewer complications. In clinical practice, when medication is needed, the IUI device needle is inserted percutaneously into the injection port, forming an infusion channel. The medication is then introduced into the reservoir within the injection port, and finally, the catheter delivers the medication into the patient's body.

[0003] Atraumatic needles for implantable infusion devices are a type of infusion needle specifically designed for use with implantable infusion devices. They typically consist of a butterfly portion and a needle body portion perpendicular to the plane of the butterfly portion. In use, the needle for the implantable infusion device is inserted into the injection port, and then the butterfly portion is placed against the patient's skin to secure the atraumatic needle.

[0004] Existing infusion needles become contaminated with the patient's blood after withdrawal, posing a risk of needle pricks and infection to medical staff and recyclers during removal and disposal. Furthermore, the exposed needles cause environmental pollution and pose serious safety hazards. As disclosed in CN217219754U, an anti-needle-prick device for infusion port needles incorporates a flat section on the needle tube to engage with a spring clip, preventing needle tip retraction and thus preventing prick. However, the width of this flat section exceeds the outer diameter of the needle tube, causing leakage of medication during actual insertion, which can adversely affect the skin or other tissues at the puncture site.

[0005] For example, Chinese patent document CN109675146A discloses a butterfly-wing non-invasive needle for implantable infusion devices. This improves the butterfly wing structure to address the issue of needle pricks. However, this rotating structure is complex to manufacture, increasing the overall cost. Therefore, designing needles for implantable infusion devices that are easy to manufacture and ensure safe use is an urgent problem to be solved. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a needle for an implantable infusion device.

[0007] The objective of this invention is achieved through the following technical solution: An implantable infusion device needle includes a base cap, a connecting assembly, and a needle tube. The connecting assembly includes an integrally molded anti-puncture base, a connecting arm, and a connecting seat. The anti-puncture base is fixed to the axis of the base cap. One end of the connecting arm is fixed to the top of the anti-puncture base, and the other end is fixed to the front end of the connecting seat. The tail end of the needle tube passes through the front end of the connecting seat, and its front end slides through the anti-puncture base. The connecting arm can be folded and retracted in multiple sections to limit the movement position of the needle tube. In the initial state, the connecting arm is folded and retracted to its shortest length, at which point the needle tip of the needle tube protrudes from the bottom of the anti-puncture base, and this is the longest exposed distance of the needle tube. In the second state, the connecting arm is extended to its longest length, at which point the needle tip of the needle tube retracts and is sealed inside the anti-puncture base.

[0008] Preferably, the connecting arm includes two symmetrically arranged support arms, each of which includes a straight-extending first segment, a second segment, and a third segment. The connection between the first segment and the anti-needle-puncture base, the connection between the first segment and the second segment, and the connection between the second segment and the third segment are respectively formed with bendable recesses, so that the first segment, the second segment, and the third segment can be folded in pairs relative to each other.

[0009] Preferably, the anti-needle-puncture base includes a top plate and a housing. The bottom cover has a hollow shaft forming a shaft hole. The top plate is placed on the shaft hole and fixedly connected to the bottom cover. The housing passes through the shaft hole and is fixedly connected to the bottom of the top plate. The top plate and the housing have hollow shafts and are connected to form a through hole. The needle tube passes through the through hole. A spring is provided inside the housing. One side of the housing is an open side, so that the bottom of the spring can elastically swing to close the needle tip of the needle tube.

[0010] Preferably, the top of the housing has a slot, and the bottom of the housing has a latch. The spring sheet has a first bend and a second bend that are S-shaped. The first bend is engaged in the slot and has a through hole, through which the needle tube passes. The second bend elastically swings relative to the open side of the housing. In the initial state, the bottom of the second bend abuts against the side wall of the needle tube. In the second state, the second bend abuts against the latch to close the needle tip of the needle tube.

[0011] Preferably, a limiting rib is provided at the top opening of the slot, and the edge of the first bent portion abuts against the limiting rib.

[0012] Preferably, a limiting groove is provided on one side of the anti-needle puncture base. The limiting groove passes through the top plate and the shell and is connected to the perforation. The width of the limiting groove is adapted to the outer diameter of the needle tube so that the needle tube slides into the perforation from the limiting groove.

[0013] Preferably, the connector includes a connecting tube and butterfly wings. The front ends of the connecting tube are fixed to the tail ends of the connecting arm. The tail end of the needle tube is inserted from the center of the front end of the connecting tube. The tail end of the connecting tube is used to connect to a catheter that communicates with the needle tube. The two butterfly wings are symmetrically arranged on both sides of the connecting tube.

[0014] Preferably, a protective sleeve is detachably fitted at the bottom of the housing, and the length of the protective sleeve is greater than the longest exposed distance of the needle.

[0015] The beneficial effects of this invention are mainly reflected in: 1. The connecting components are integrally injection molded to maximize savings in manufacturing difficulty and cost. A foldable and retractable connecting arm is provided to cooperate with the anti-needle-puncture base to form a reliable anti-needle-puncture effect. In the second state, the connecting arm is extended to limit the pull-out distance of the needle tube and cooperates with the anti-needle-puncture base to limit the secondary puncture of the needle tube, so as to prevent the needle tube from falling out and causing unnecessary risks. In the initial state, the connecting arm is retracted to shorten the distance between the connecting seat and the bottom cover, while still ensuring an easy-to-operate size, which is convenient for medical staff to operate. 2. The connecting arm is composed of a straight-extending first section, a second section, and a third section, making each section a rigid structure to facilitate limiting the extension direction of each section. This allows for easy folding and fitting of the two sections together, enabling the connecting arm to be retracted to its shortest length while maintaining sufficient strength to improve support and facilitate hand operation by medical personnel. The recessed portion of the connecting arm is also integrally formed to enhance the toughness at the bend, making it less prone to breakage and increasing reliability. 3. A spring is installed inside the anti-needle puncture base to seal the needle tip and prevent the needle from piercing out and causing secondary injury. Attached Figure Description

[0016] The technical solution of the present invention will be further described below with reference to the accompanying drawings: Figure 1 : A schematic diagram of an embodiment of the present invention; Figure 2 Cross-sectional view of an embodiment of the present invention; Figure 3 : A schematic diagram of the spring sheet in an embodiment of the present invention; Figure 4 : A partial schematic diagram from another angle of an embodiment of the present invention; Figure 5 : A schematic diagram of the connecting components in an embodiment of the present invention. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0018] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0019] like Figures 1 to 5 As shown, this invention discloses a needle for an implantable infusion device, including a base cover 1, a connecting assembly, and a needle tube 2. The connecting assembly includes an anti-puncture base 3, a connecting arm 4, and a connecting seat 5, all integrally injection molded. The anti-puncture base 3 is fixed to the axis of the base cover 1. One end of the connecting arm 4 is fixed to the top of the anti-puncture base 3, and the other end is fixed to the front end of the connecting seat 5. The tail end of the needle tube 2 passes through the front end of the connecting seat 5, and its front end slides through the anti-puncture base 3. The connecting arm 4 can be folded and retracted in multiple sections to limit the movement position of the needle tube 2. In the initial state, the connecting arm 4 is folded and retracted to its shortest length, at which time the needle tip of the needle tube 2 protrudes from the bottom of the anti-puncture base 3, and this is the longest exposed distance of the needle tube 2. In the second state, the connecting arm 4 is extended to its longest length, at which time the needle tip of the needle tube 2 retracts and is sealed inside the anti-puncture base 3.

[0020] The connecting component in this solution is integrally injection molded to maximize savings in manufacturing difficulty and cost. The foldable and retractable connecting arm 4 is designed to cooperate with the anti-needle-puncture base 3 to form a reliable anti-needle-puncture effect. In the second state, the connecting arm 4 is extended to limit the pull-out distance of the needle tube 2 and cooperates with the anti-needle-puncture base 3 to limit the secondary puncture of the needle tube 2, preventing the needle tube 2 from detaching and causing unnecessary risks. In the initial state, the connecting arm 4 is retracted to shorten the distance between the connecting seat 5 and the bottom cover 1, while still ensuring that the overall structure maintains a size that is easy for medical staff to hold and operate, making it convenient for medical staff to operate.

[0021] Specifically, such as Figure 1 and Figure 5 As shown, the connecting arm 4 includes two symmetrically arranged support arms. Each support arm includes a straight-extending first segment 401, a second segment 402, and a third segment 403. Bendable recesses 404 are formed at the connections of the first segment 401 and the anti-needle-puncture base 3, the first segment 401 and the second segment 402, and the second segment 402 and the third segment 403, respectively, allowing the first segment 401, the second segment 402, and the third segment 403 to be folded in pairs. The connecting arm 4 is composed of the straight-extending first segment 401, the second segment 402, and the third segment 403, making each segment a rigid structure to easily define the extension direction of each segment. This facilitates folding and fitting in pairs, allowing the connecting arm 4 to retract to its shortest extension distance and providing sufficient strength to improve support and facilitate handheld operation by medical personnel. The recess 404 is also integrally formed, which enhances the toughness of the bend, making it less prone to breakage and improving reliability. Furthermore, it eliminates the need for other connecting structures, such as a pivot, simplifying the overall structure and enhancing ease of use. In a preferred embodiment of this solution, the connecting arm 4 is preferably a three-segment folding structure, minimizing the retraction distance while ensuring the unfolded distance meets the retraction length requirement of the needle tube 2. The symmetrical arrangement of the two arms relative to the needle tube 2 also makes the overall extension and retraction of the connecting arm 4 more stable. In other feasible embodiments, the connecting arm 3 can also use other odd-numbered segments to achieve the folding and retraction function.

[0022] The anti-needle-puncture base 3 in this solution includes a top plate 301 and a housing 302. The bottom cover 1 has a hollow shaft forming a shaft hole. The top plate 301 is placed on the shaft hole and fixedly connected to the bottom cover 1. The housing 302 passes through the shaft hole and is fixedly connected to the bottom of the top plate 301. The top plate 301 and the housing 302 have hollow shafts and are connected to form a through hole. The needle tube 2 passes through the through hole. A spring piece 6 is provided inside the housing 302. One side of the housing 302 is an open side, so that the bottom of the spring piece 6 can be elastically oscillated to close the needle tip of the needle tube 2. The top plate 301 is preferably circular to fit the shaft hole.

[0023] Specific examples Figure 1 , Figure 2 and Figure 5As shown, the top of the housing 302 has a slot 3021, and the bottom of the housing 302 has a notch 3022. The spring piece 6 has a first bent portion 601 and a second bent portion 602 that are S-shaped. The first bent portion 601 is engaged in the slot 3021, and a through hole 603 is formed on the first bent portion 601. The needle tube 2 passes through the through hole 603. Similarly, the top of the first bent portion 601 is provided with a notch 604 that is coaxially arranged with the through hole 603 to allow the needle tube 2 to pass through. The second bent portion 602 elastically swings relative to the open side of the housing 302. In the initial state, the bottom of the second bent portion 602 abuts against the side wall of the needle tube 2; in the second state, the second bent portion 602 abuts against the notch 3022 to close the needle tip of the needle tube 2. The first bending portion 601 is engaged within the slot 3021, and the needle tube 2 passes through the through hole 603, allowing the spring piece 6 to be stably engaged within the housing 302. This ensures that the first bending portion 601 is unaffected by the swinging of the second bending portion 602, guaranteeing the stability of the spring piece 6. The second bending portion 602 makes the bottom of the spring piece 6 hook-shaped, effectively sealing the bottom of the housing 302 in the second state, thus sealing the needle tip of the needle tube 2 and preventing the risk of the needle tip protruding again.

[0024] Furthermore, a limiting rib 3023 is protruding from the top opening of the slot 3021, and the edge of the first bent portion 601 abuts against the limiting rib 3023 to further limit the position of the first bent portion 601 and ensure that the first bent portion 601 is reliably locked in the slot 2021.

[0025] A limiting groove 303 is provided on one side of the anti-needle puncture base 3. The limiting groove 303 passes through the top plate 301 and the housing 302 and communicates with the through hole. The width of the limiting groove 303 is adapted to the outer diameter of the needle tube 2 so that the needle tube 2 can slide into the through hole from the limiting groove 303. In this design, the tail end and the front end of the needle tube 2 are bent at approximately ninety degrees, which includes a horizontal section and a vertical section. The setting of the limiting groove 303 can facilitate the vertical section of the needle tube 2 to be inserted more conveniently into the anti-needle puncture base 3.

[0026] The connecting seat 5 includes a connecting tube 501 and butterfly wings 502. The front ends of the connecting tube 501 are fixed to the tail ends of the connecting arm 4. The tail end of the needle tube 2 passes through the center of the front end of the connecting tube 501. The tail end of the connecting tube 501 is used to connect to a catheter communicating with the needle tube 2. The two butterfly wings 502 are symmetrically arranged on both sides of the connecting tube 501. The connecting tube 501 connects the needle tube 2 and the catheter (not shown in the figure), and the catheter is used to connect the medication for infusion. The butterfly wings 502 facilitate handheld operation.

[0027] Furthermore, a protective sleeve 304 is detachably fitted onto the bottom of the housing 302, and the length of the protective sleeve 304 is greater than the longest exposed distance of the needle tube 2. In a preferred embodiment, the housing 302 and the protective sleeve 304 are interference-fitted to facilitate the insertion and removal of the protective sleeve 304. In other feasible embodiments, the protective sleeve 304 can also be connected to the housing 302 using other feasible connection methods. The protective sleeve 304 can protect the needle tube 2 from interference from the external environment.

[0028] In this solution, the bottom cover 1 is a circular cover. In other feasible embodiments, the bottom cover 1 can be a cover structure of other shapes or a sheet structure.

[0029] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0030] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A needle for an implantable infusion device, characterized in that: The device includes a bottom cover (1), a connecting assembly, and a needle tube (2). The connecting assembly includes an anti-needle-puncture base (3), a connecting arm (4), and a connecting seat (5), all integrally injection molded. The anti-needle-puncture base (3) is fixed to the axis of the bottom cover (1). One end of the connecting arm (4) is fixed to the top of the anti-needle-puncture base (3), and the other end is fixed to the front end of the connecting seat (5). The tail end of the needle tube (2) passes through the front end of the connecting seat (5), and its front end slides through the connecting seat (5). Inside the anti-needle puncture base (3), the connecting arm (4) can be folded and retracted in multiple sections to limit the movement position of the needle tube (2); in the initial state, the connecting arm (4) is folded and retracted to its shortest length, at which time the needle tip of the needle tube (2) protrudes from the bottom of the anti-needle puncture base (3), and this is the longest exposed distance of the needle tube (2); in the second state, the connecting arm (4) is extended to its longest length, at which time the needle tip of the needle tube (2) retracts and is sealed inside the anti-needle puncture base (3).

2. The needle for the implantable infusion device according to claim 1 is characterized in that: The connecting arm (4) includes two symmetrically arranged support arms. Each support arm includes a straight-extending first segment (401), a second segment (402), and a third segment (403). The connection between the first segment (401) and the anti-needle-puncture base (3), the connection between the first segment (401) and the second segment (402), and the connection between the second segment (402) and the third segment (403) are respectively formed with bendable recesses (404) so ​​that the first segment (401), the second segment (402), and the third segment (403) can be folded in pairs.

3. The needle for the implantable infusion device according to claim 2 is characterized in that: The anti-needle puncture base (3) includes a top plate (301) and a housing (302). The bottom cover (1) has a hollow shaft forming a shaft hole. The top plate (301) is placed on the shaft hole and fixedly connected to the bottom cover (1). The housing (302) passes through the shaft hole and is fixedly connected to the bottom of the top plate (301). The top plate (301) and the housing (302) have hollow shafts and are connected to form a through hole. The needle tube (2) is inserted into the through hole. A spring piece (6) is provided inside the housing (302). One side of the housing (302) is an open side so that the bottom of the spring piece (6) can be elastically swung to close the needle tip of the needle tube (2).

4. The needle for the implantable infusion device according to claim 3 is characterized in that: The top of the housing (302) is provided with a slot (3021), and the bottom of the housing (302) is provided with a slot (3022). The spring piece (6) is formed with a first bend (601) and a second bend (602) in an S-shape. The first bend (601) is engaged in the slot (3021), and a through hole (603) is provided on the first bend (601). The needle tube (2) passes through the through hole (603). The second bend (602) swings elastically relative to the open side of the housing (302). In the initial state, the bottom of the second bend (602) abuts against the side wall of the needle tube (2). In the second state, the second bend (602) abuts against the slot (3022) to close the needle tip of the needle tube (2).

5. The needle for the implantable infusion device according to claim 4 is characterized in that: The top opening of the slot (3021) is provided with a limiting rib (3023), and the edge of the first bent part (601) abuts against the limiting rib (3023).

6. The needle for the implantable infusion device according to claim 3 is characterized in that: The anti-needle puncture base (3) has a limiting groove (303) on one side. The limiting groove (303) passes through the top plate (301) and the shell (302) and is connected to the perforation. The width of the limiting groove (303) is adapted to the outer diameter of the needle tube (2) so that the needle tube (2) slides into the perforation from the limiting groove (303).

7. The needle for the implantable infusion device according to claim 1 is characterized in that: The connecting seat (5) includes a connecting tube (501) and a butterfly wing (502). The front ends of the connecting tube (501) are fixed to the tail ends of the connecting arm (4). The tail end of the needle tube (2) is inserted from the center of the front end of the connecting tube (501). The tail end of the connecting tube (501) is used to connect a catheter that communicates with the needle tube (2). The two butterfly wings (502) are symmetrically arranged on both sides of the connecting tube (501).

8. The needle for the implantable infusion device according to claim 3 is characterized in that: The bottom of the housing (302) is detachably fitted with a protective sleeve (304), the length of which is greater than the longest exposed distance of the needle (2).

Images