Injection needle with telescopic needle tip

Abstract

The injection needle comprises a fixed handle, a movable handle and a needle tube, the needle tube is partially arranged in an outer sheath tube, and the needle tip is arranged at the far end of the needle tube; a connecting column is arranged at the far end of the movable handle, and the near end of the needle tube extends into the fixed handle and is fixedly connected with the connecting column; a needle pushing assembly is arranged in the fixed handle and comprises a U-shaped pushing block, an elastic connecting piece and a positioning column, wherein the elastic connecting piece and the positioning column are arranged between the U-shaped pushing block and the connecting column. A limiting assembly is further arranged in the fixed handle and used for being matched with the needle pushing assembly so that the needle point can be kept in the needle withdrawing state or the needle retracting state. According to the scheme, the push button on the injection needle can be operated by one hand to enable the needle point to stretch out and draw back through the needle pushing assembly, operation is convenient, the limiting assembly is adopted for locking in the needle withdrawing state and the needle retracting state, the stroke does not need to be considered, and one-step operation is achieved.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to an injection needle with a retractable tip. Background Technology

[0002] Most injection needles on the market require two hands to control the extension and retraction of the needle tip, and a single surgery requires the cooperation of multiple medical staff.

[0003] For example, Chinese utility model patent CN219354105U discloses an endoscopic injection needle, including an outer sheath, a needle tube, and an operating component. The outer sheath extends from the proximal end to the distal end; the needle tube has a fluid channel and a puncture tip located at the distal end, and the needle tube is movable relative to the outer sheath, with at least a partial positioning within the outer sheath; the operating component is located at the proximal end of the outer sheath and is used to move the needle tube so that the puncture tip of the needle tube can extend or retract from the distal end of the outer sheath, and a marking portion is provided on the needle tube near the puncture tip. The endoscopic injection needle provided in this application, because of the marking portion near the puncture tip, allows for precise identification of the depth of needle insertion into human tissue by observing whether the marking portion extends beyond the outer sheath and the distance by which the marking portion extends beyond the outer sheath, thus greatly facilitating precise and rapid injection operations for the operator.

[0004] In the above scheme, such as Figure 9 and Figure 11 As shown, the injection needle remains in the retracted position, and the limiting protrusion on the movable handle, in conjunction with the retracted limiting groove, is positioned proximally; as... Figure 10 and Figure 12 As shown, the injection needle remains in the needle-out state, and the limiting protrusion on the movable handle is located at the distal end in conjunction with the needle-out limiting groove; therefore, during the operation, medical staff need to hold the fixed handle with one hand and operate the movable handle with the other hand to achieve the coordination between the movable handle and the fixed handle, which is inconvenient to operate, requires the cooperation of multiple medical staff, and increases the operation time. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide an injection needle with a retractable tip. This injection needle can be operated with one hand; simply pushing the push button controls the extension and retraction of the needle tip without considering the travel distance. It is convenient to operate, reduces the number of medical staff required, shortens the operation time, and at the same time avoids the needle tip scratching the endoscope forceps channel or tearing the protective equipment of medical staff, thus protecting medical staff.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A retractable injection needle includes a fixed handle, a movable handle, and a needle tube. The distal end of the fixed handle has an outer sheath. The movable handle is movable relative to the fixed handle. The needle tube is housed within the outer sheath, and the distal end of the needle tube has a needle tip. Its distinguishing feature is:

[0008] The distal end of the movable handle is provided with a connecting post that extends into the fixed handle, and the proximal end of the needle extends into the fixed handle and is fixedly connected to the connecting post.

[0009] The fixed handle contains a pusher assembly, which includes a U-shaped push block, an elastic connector and a positioning post disposed between the U-shaped push block and the connecting post; the elastic connector includes a first elastic connector and a second elastic connector; the positioning post includes a first positioning post, a second positioning post, a third positioning post and a fourth positioning post; the first positioning post and the fourth positioning post are fixed on the inner wall of the U-shaped push block, and the second positioning post and the third positioning post are fixed on the outer wall of the connecting post; the two ends of the first elastic connector are fixedly connected to the first positioning post and the second positioning post respectively, and the two ends of the second elastic connector are fixedly connected to the third positioning post and the fourth positioning post respectively.

[0010] The U-shaped push block is provided with a push button that extends a fixed handle. Under the action of external force, the push button can move the U-shaped push block to the distal end to pull the first elastic connector, thereby driving the connecting column to move to the distal end to make the needle tip extend out of the outer sheath, or move to the proximal end to pull the second elastic connector, thereby driving the connecting column to move to the proximal end to make the needle tip retract into the outer sheath.

[0011] The fixed handle is also equipped with a limiting component, which is used to cooperate with the needle pusher component to keep the needle tip in the needle extension state or the needle retraction state.

[0012] Preferably, the first elastic connector and the second elastic connector are respectively a first tension spring and a second tension spring arranged along the needle tip contraction direction, and the first tension spring and the second tension spring are symmetrically arranged relative to the connecting post.

[0013] Preferably, the connecting post is provided with two receiving grooves, and the tension spring coil is disposed in the receiving groove.

[0014] Preferably, a limiting wall protrudes outward on the side wall of the connecting post. This limiting wall can cooperate with the limiting component to limit the connecting post, thereby keeping the needle tip in the needle-out state or the needle-retracted state.

[0015] Preferably, the limiting assembly includes two limiting cams, two limiting springs, and two limiting posts;

[0016] Two limiting posts are fixed to the inner wall of the fixed handle along the moving direction of the connecting post, including a first limiting post at the far end and a second limiting post at the near end;

[0017] The two limiting cams include a first limiting cam respectively sleeved on the first limiting post and a second limiting cam on the second limiting post, and the free ends of the two limiting cams are located on the moving path of the limiting wall.

[0018] Two limiting springs are set on both sides of the two limiting cams. One end of the limiting spring is fixed to the inner wall of the fixed handle, and the other end acts on the free end of the limiting cam respectively.

[0019] The needle tip remains in the retracted state, the upper end of the limiting wall abuts against the free end of the second limiting cam, and the connecting column extends out of the fixed handle;

[0020] The needle tip remains in the retracted state, and the lower end of the limiting wall abuts against the free surface of the first limiting cam.

[0021] Preferably, the needle tube includes a push tube and an inner tube. The push tube is located inside a fixed handle. The proximal end of the push tube is fixedly connected to a connecting post. The inner tube is adapted to be installed inside an outer sheath. The proximal end of the inner tube is fixed to the distal end of the push tube. The needle tip is fixedly located at the distal end of the inner tube.

[0022] The movable handle, connecting column, booster tube, inner tube, and needle tip are connected to form an injection channel.

[0023] Preferably, the proximal end of the movable handle is provided with a Luer connector.

[0024] The present invention adopts the above technical solution and has the following beneficial effects:

[0025] ① After medical staff apply the push button outside the fixed handle, the U-shaped push block can move back and forth within the fixed handle. Under the action of external force, the push button can move the U-shaped push block distally, pulling the first elastic connector. Through the second positioning post, it drives the connecting post distally, causing the needle tip to extend out of the outer sheath. Under the action of external force, the push button can move the U-shaped push block proximally, pulling the second elastic connector. Through the third positioning post, it drives the connecting post proximally, causing the needle tip to retract into the outer sheath. In this way, the push button on the injection needle can extend and retract the needle tip with one hand, which is convenient to operate, reduces the number of medical staff, reduces the operation time, and uses a limit component to lock the needle in both the needle extension and retraction states, eliminating the need to consider the stroke and achieving one-step operation.

[0026] ② The elastic connector uses a tension spring to withstand axial tension, which is in the same direction as the needle tip contraction. It has high fitting precision and good buffering performance. Furthermore, the tension spring coil is placed in the receiving groove, which can prevent the tension spring coil from misaligning to a certain extent and improve the stroke stability of the tension spring coil.

[0027] ③ The limiting component mainly uses a cam, which is easy to move and convenient to cooperate with the limiting wall. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an injection needle with a retractable tip that remains in the retracted position.

[0029] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0030] Figure 3 for Figure 1 Enlarged diagram of point C in the middle.

[0031] Figure 4 This is a schematic diagram of an injection needle with a retractable tip that remains in the out-of-the-tip position.

[0032] Figure 5 for Figure 4 Enlarged diagram of point B in the middle.

[0033] Figure 6 for Figure 4 Enlarged diagram of point D in the middle.

[0034] Figure 7 This is a schematic diagram showing the installation of the tension spring coil and the receiving groove.

[0035] Figure 8 for Figure 7 Enlarged diagram of point E in the middle.

[0036] Figure 9 This is a schematic diagram of an endoscopic injection needle being held in the retracted state in the background art.

[0037] Figure 10 for Figure 9 Enlarged schematic diagram of point H in the middle.

[0038] Figure 11 This is a schematic diagram of an endoscopic injection needle being held in the dispensing state in the background art.

[0039] Figure 12 for Figure 11 Enlarged schematic diagram of point G in the middle. Detailed Implementation

[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the 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. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] like Figures 1-8 The illustrated needle with retractable tip includes a fixed handle 1, a movable handle 2, and a needle tube. The distal end of the fixed handle 1 is provided with an outer sheath 3. The movable handle 2 can move relative to the fixed handle 1. The needle tube is disposed inside the outer sheath 3, and the distal end of the needle tube is provided with a needle tip 4.

[0046] The distal end of the movable handle 2 is provided with a connecting post 5 that extends into the fixed handle 1, and the proximal end of the needle extends into the fixed handle 1 and is fixedly connected to the connecting post 5.

[0047] The fixed handle 1 is provided with a push pin assembly, which includes a U-shaped push block 20, and an elastic connector and a positioning pin disposed between the U-shaped push block 20 and the connecting post 5. The elastic connector includes a first elastic connector and a second elastic connector. The positioning pin includes a first positioning pin 61, a second positioning pin 62, a third positioning pin 63, and a fourth positioning pin 64. The first positioning pin 61 and the fourth positioning pin 64 are fixed on the inner wall of the U-shaped push block 20, and the second positioning pin 62 and the third positioning pin 63 are fixed on the outer wall of the connecting post 5. The two ends of the first elastic connector are fixedly connected to the first positioning pin 61 and the second positioning pin 62, respectively, and the two ends of the second elastic connector are fixedly connected to the third positioning pin 63 and the fourth positioning pin 64, respectively.

[0048] The U-shaped push block 20 is provided with a push button 7 that extends out of the fixed handle 1. Under the action of external force, the push button 7 can move the U-shaped push block 20 to the far end to pull the first elastic connector, thereby driving the connecting post 5 to move to the far end to make the needle tip 4 extend out of the outer sheath 3, or move to the proximal end to pull the second elastic connector, thereby driving the connecting post 5 to move to the proximal end to make the needle tip 4 retract into the outer sheath 3.

[0049] The fixed handle 1 is also provided with a limiting component, which is used to cooperate with the needle pusher component to keep the needle tip 4 in the needle extension state or the needle retraction state.

[0050] In the above technical solution, after the medical staff applies the push button outside the fixed handle, the U-shaped push block can move back and forth inside the fixed handle. Specifically, under the action of external force, the push button 7 can move the U-shaped push block 20 to the distal end to pull the first elastic connector, and drive the connecting post 5 to move to the distal end through the second positioning post to make the needle tip 4 extend out of the outer sheath 3; under the action of external force, the push button 7 can move the U-shaped push block 20 to the proximal end to pull the second elastic connector, and drive the connecting post 5 to move to the proximal end through the third positioning post to make the needle tip 4 retract into the outer sheath 3.

[0051] In this way, the push button on the injection needle can extend and retract the needle tip with one hand, which is convenient to operate, reduces the number of medical staff, and shortens the operation time. Furthermore, the limit component locks the needle in both the out and in retraction states, eliminating the need to consider the stroke and allowing for a one-step operation.

[0052] It should be noted here that the first elastic connector and the second elastic connector can be components with a certain elasticity and stretching capacity, such as rubber bands, springs, etc.

[0053] like Figure 6As shown, the first elastic connector and the second elastic connector are respectively a first tension spring 81 and a second tension spring 82 arranged along the needle tip contraction direction, and the first tension spring 81 and the second tension spring 82 are symmetrically arranged relative to the connecting post 5. In this technical solution, the axial tensile force is borne in the same direction as the needle tip contraction, resulting in high fitting accuracy and good buffering performance.

[0054] like Figure 8 As shown, the connecting post 5 is provided with two receiving grooves 9, and the tension spring coil is disposed in the receiving grooves 9. In this technical solution, placing the tension spring coil in the receiving groove can, to a certain extent, prevent the tension spring coil from misaligning during travel and improve the travel stability of the tension spring coil.

[0055] It should be noted that the aforementioned U-shaped push block can be cylindrical, with multiple circumferentially oriented receiving grooves on the side wall of the connecting column, and multiple tension springs corresponding to these grooves. Furthermore, the side wall of the U-shaped push block has an inwardly recessed opening, and the side wall of the connecting column has a correspondingly outwardly extending limiting wall. This limiting wall cooperates with a limiting component to limit the position of the connecting column, thereby keeping the needle tip in either the extended or retracted state. This allows for quicker and more convenient engagement between the U-shaped push block and the connecting column, resulting in a more stable structure.

[0056] In addition, a groove can be provided on the inner wall of the fixed handle to slide in conjunction with the U-shaped push block. This groove should be provided along the extension and retraction direction of the needle tip.

[0057] like Figure 3 and Figure 6 As shown, a limiting wall 10 protrudes outward on the side wall of the connecting post 5. The limiting wall 10 can cooperate with the limiting component to limit the connecting post 5, thereby keeping the needle tip 4 in the needle extension state or the needle retraction state.

[0058] Furthermore, the limiting assembly includes two limiting cams, two limiting springs 11, and two limiting posts;

[0059] Two limiting posts are fixed on the inner wall of the fixed handle 1 along the moving direction of the connecting post 5, including a first limiting post 12 at the far end and a second limiting post 13 at the near end;

[0060] The two limiting cams include a first limiting cam 14 respectively sleeved on the first limiting post 12 and a second limiting cam 15 respectively sleeved on the second limiting post 13, and the free ends of the two limiting cams are located on the moving path of the limiting wall 10.

[0061] Two limiting springs 11 are set on both sides of the two limiting cams. One end of the limiting spring 11 is fixed on the inner wall of the fixed handle 1, and the other end acts on the free end of the limiting cam respectively.

[0062] The needle tip 4 remains in the retracted state, the upper end of the limiting wall 10 abuts against the free end of the second limiting cam 15, and the connecting column 5 extends out of the fixed handle 1.

[0063] The needle tip 4 remains in the retracted state, and the lower end of the limiting wall 10 abuts against the free surface of the first limiting cam 14.

[0064] In the above technical solution, the needle tip remains in the retracted state, the upper end of the limiting wall abuts against the free end of the second limiting cam, and the connecting post extends out from the rear side of the fixed handle; pushing the push button upward causes the limiting wall to move upward by opening the free end of the second limiting cam and pressing the free end of the first limiting cam, compressing the first limiting spring by the first limiting cam, and the limiting wall moves to a position where it no longer presses the first limiting cam, with the first limiting spring acting on the free end of the first limiting cam, and the free end of the first limiting cam rotating out to abut against the lower end of the limiting wall, thus keeping the needle tip in the retracted state; pushing the push button downward causes the limiting wall to move downward by opening the free end of the first limiting cam and pressing the free end of the second limiting cam, compressing the second limiting spring, and the limiting wall moves to a position where it no longer presses the second limiting cam, with the second limiting spring acting on the free end of the second limiting cam, and the free end of the second limiting cam rotating out to abut against the upper end of the limiting wall, thus keeping the needle tip in the retracted state again.

[0065] like Figure 1 As shown, the needle tube includes a push tube 16 and an inner tube 17. The push tube 16 is located inside the fixed handle 1, and its proximal end is fixedly connected to the connecting post 5. The inner tube 17 is adapted and installed inside the outer sheath 3, and its proximal end is fixed to the distal end of the push tube 16. The needle tip 4 is fixedly disposed at the distal end of the inner tube 17. The movable handle 2, connecting post 5, push tube 16, inner tube 17, and needle tip 4 are interconnected to form an injection channel. In this technical solution, the push tube and inner tube enable the needle tube to move back and forth stably, thereby allowing the needle tip to extend and retract stably.

[0066] Furthermore, a Luer connector 18 is provided on the proximal end of the movable handle 2. In this technical solution, the Luer connector is used to connect the infusion bag, which is more convenient.

[0067] In this specific embodiment, to address the inconvenience and high labor costs associated with the use of two hands in existing injection needles, the above solution incorporates a needle-pushing component and a limiting component within the fixed handle of the injection needle. A simple push of the push button controls the extension and retraction of the needle tip, allowing for single-handed operation without considering travel distance. This streamlined process reduces the number of medical personnel required and shortens surgical time. Furthermore, it prevents the needle tip from scratching the endoscope's forceps or damaging the medical personnel's protective equipment, thus protecting the medical staff.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A retractable needle, comprising a fixed handle (1), a movable handle (2) and a needle tube, the distal end of the fixed handle (1) is provided with an outer sheath (3), the movable handle (2) can move relative to the fixed handle (1), the needle tube is partially arranged in the outer sheath (3), and the distal end of the needle tube is provided with a needle tip (4); characterized in that: the distal end of the movable handle (2) is provided with a connecting column (5) extending into the fixed handle (1), and the proximal end of the needle tube extends into the fixed handle (1) and is fixedly connected with the connecting column (5); a needle pushing assembly is arranged in the fixed handle (1), the needle pushing assembly comprises a U-shaped push block (20), an elastic connecting piece and a positioning column arranged between the U-shaped push block (20) and the connecting column (5); the elastic connecting piece comprises a first elastic connecting piece and a second elastic connecting piece; the positioning column comprises a first positioning column (61), a second positioning column (62), a third positioning column (63) and a fourth positioning column (64); the first positioning column (61) and the fourth positioning column (64) are fixed on the inner wall of the U-shaped push block (20), the second positioning column (62) and the third positioning column (63) are fixed on the outer wall of the connecting column (5); the two ends of the first elastic connecting piece are fixedly connected with the first positioning column (61) and the second positioning column (62) respectively, and the two ends of the second elastic connecting piece are fixedly connected with the third positioning column (63) and the fourth positioning column (64) respectively; the U-shaped push block (20) is provided with a push button (7) extending out of the fixed handle (1), the push button (7) can drive the U-shaped push block (20) to move to the distal end under the action of an external force to pull the first elastic connecting piece, so as to drive the connecting column (5) to move to the distal end to make the needle tip (4) extend out of the outer sheath (3), or to move to the proximal end to pull the second elastic connecting piece, so as to drive the connecting column (5) to move to the proximal end to make the needle tip (4) retract into the outer sheath (3); a limiting assembly is further arranged in the fixed handle (1) and used for cooperating with the needle pushing assembly to keep the needle tip (4) in a needle extending state or a needle retracting state. The first elastic connecting piece and the second elastic connecting piece are respectively a first tension spring (81) and a second tension spring (82) arranged in the needle tip retracting direction, and the first tension spring (81) and the second tension spring (82) are symmetrically arranged relative to the connecting column (5). The connecting column (5) is provided with two accommodating grooves (9), and the tension spring coil is arranged in the accommodating groove (9). The side wall of the connecting column (5) is outwardly provided with a limiting wall (10), and the limiting wall (10) can cooperate with the limiting assembly to limit the connecting column (5), so as to keep the needle tip (4) in the needle extending state or the needle retracting state. The limiting assembly comprises two limiting cams, two limiting springs (11) and two limiting columns; 2. An injection needle according to claim 1, wherein: The two limiting columns are fixed on the inner wall of the fixed handle (1) along the movement direction of the connecting column (5) and comprise a first limiting column (12) at the distal end and a second limiting column (13) at the proximal end.

3. An injection needle according to claim 2, wherein: ​ 4. The retracting needle according to claim 1, wherein: ​ 5. A retracting needle according to claim 4, wherein: ​ ​ Two limiting cams include a first limiting cam (14) sleeved on the first limiting column (12) and a second limiting cam (15) sleeved on the second limiting column (13), and free ends of the two limiting cams are located on a moving path of the limiting wall (10); Two limiting springs (11) are arranged on two sides of the two limiting cams, one end of the limiting spring (11) is fixed on an inner wall of the fixed handle (1), and the other end is respectively applied to the free end of the limiting cam; The needle tip (4) is kept in a retracted state, the upper end of the limiting wall (10) abuts against the free end of the second limiting cam (15), and the connecting column (5) partially extends out of the fixed handle (1); The needle tip (4) is kept in a retracted state, the lower end of the limiting wall (10) abuts against the free end of the first limiting cam (14).

6. The retracting needle according to claim 1, wherein: The needle tube includes a booster tube (16) and an inner tube (17), the booster tube (16) is located in the fixed handle (1), the proximal end of the booster tube (16) is fixedly connected with the connecting column (5), the inner tube (17) is fittedly installed in the outer sheath tube (3), and the proximal end of the inner tube (17) is fixed with the distal end of the booster tube (16); the needle tip (4) is fixedly arranged at the distal end of the inner tube (17); The movable handle (2), the connecting column (5), the booster tube (16), the inner tube (17) and the needle tip (4) are connected in communication to form an injection channel.

7. A retracting needle according to claim 6, wherein: A luer connector (18) is arranged on the proximal end of the movable handle (2).

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