Fixed injection needle

Abstract

The utility model relates to the field of endoscope injection needles, in particular to a fixed type injection needle, which combines an injection needle with an endoscope clamp, can firstly clamp, fix and lift a gastrointestinal arm, and then inject, can effectively solve the problem that the puncture of the injection needle is too deep or too shallow, and improves the success rate of injection. Comprising an outer sheath tube, a sleeve is fixedly arranged at the inner end of the outer sheath tube, a pair of forceps pieces capable of being clamped and closed are arranged at the inner end of the sleeve, a pull rope for pulling the forceps pieces is arranged in the outer sheath tube, a handle is arranged at the outer end of the outer sheath tube, a sliding block capable of sliding front and back sleeves the handle, a pull plate is arranged at the inner end of the sliding block, and the pull plate is fixedly connected with the outer end of the pull rope. An injection structure capable of sliding back and forth is arranged in the outer sheath tube. The device is easy to operate, convenient to use and suitable for various patients.

Description

Technical Field

[0001] The utility model relates to the field of endoscopic injection needles, in particular to a fixed injection needle. Background Art

[0002] An endoscopic injection needle can be inserted into the patient's body through the working channel of the endoscope. Approaching the lesion, the handle is then operated to pierce the target tissue. Chinese utility model patent application number 202322644461.X discloses a disposable endoscopic injection needle. By providing a pusher block and an adjustment block, the operator precisely controls the amount of fluid, thereby controlling the distance the adjustment block moves toward the axis. This allows for more accurate needle bending. Compared to existing techniques that utilize part deformation to bend the needle, this device offers greater reliability.

[0003] The above-mentioned disposable endoscopic injection needle mainly solves the problem of how to make the bending of the injection needle more accurate. However, when injecting liquid into the gastrointestinal wall through an endoscopic injection needle, the injection needle is required to penetrate the epithelium, mucosa, muscularis mucosa and reach the submucosal layer for injection. However, since the gastrointestinal arm is not fixed and is relatively soft, the injection needle often punctures too deep or too shallow, resulting in a low injection success rate. Figure 1 As shown, an endoscope clamp includes an outer sheath 1, a cannula 2 provided at the inner end of the outer sheath 1, a pair of closable forceps 3 provided at the inner end of the cannula 2, a drawstring 45 provided in the outer sheath 1 for pulling the forceps 3, a handle 4 provided at the outer end of the outer sheath 1, a slider 5 slidable back and forth sleeved on the handle 4, a pull plate 44 provided inside the slider 5, the pull plate 44 being fixedly connected to the outer end of the drawstring 45, and a second sliding sleeve 6 fixedly provided at the outer end of the handle 4. If an injection needle can be combined with the endoscope clamp, the gastrointestinal arm can be clamped and fixed before injection, which can greatly avoid the problem of over-deep or over-shallow puncture. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model provides a fixed injection needle, which combines the injection needle with an endoscopic clamp, which can first clamp and fix the gastrointestinal arm and pull it up before injection, which can effectively solve the problem of the injection needle puncturing too deep or too shallow and improve the injection success rate.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fixed injection needle, comprising an outer sheath, a sleeve fixedly provided at the inner end of the outer sheath, a pair of clamping blades provided at the inner end of the sleeve, a pull rope for pulling the blades provided in the outer sheath, a handle provided at the outer end of the outer sheath, a slider which can slide back and forth sleeved on the handle, a pull plate provided inside the slider, the pull plate fixedly connected to the outer end of the pull rope, an injection structure which can slide back and forth provided in the outer sheath, the injection structure comprising an injection tube, the front end of the injection tube connected to the injection needle, a reinforcement structure fixedly provided on one side of the injection tube, the inner end of the injection needle flush with the inner port of the sleeve, a first sliding sleeve which slides in cooperation with the injection tube and the reinforcement structure fixedly provided in the sleeve outside the injection needle;

[0006] The outer ends of the injection tube and the reinforcement structure extend out of the outer sheath and are fixedly connected to the injection port. The injection tube and the reinforcement structure on the inner side of the injection port are provided with a second sliding sleeve, and the inner end of the second sliding sleeve is fixedly connected to the outer end of the handle.

[0007] A boss is fixedly provided on the handle at the front side of the slider, and a first limiting bolt is screwed backward on the boss.

[0008] As a preferred technical solution, the reinforcement structure is a steel wire, which is bonded and fixed to the side of the injection tube.

[0009] As a preferred technical solution, the first sliding sleeve is fixed to the inner surface of the sleeve on the lower side of the pull rope.

[0010] As a preferred technical solution, the first sliding sleeve is cylindrical and has a first slide hole embedded therein that matches the injection tube and the steel wire.

[0011] As a preferred technical solution, the second sliding sleeve is cylindrical, the inner end surface is fixedly connected to the outer end surface of the handle, and a second slide hole that slides with the injection tube and the steel wire is embedded on the lower side of the center position.

[0012] As a preferred technical solution, a second limiting bolt with an extruded steel wire is screwed inwardly on one side of the second sliding sleeve.

[0013] Compared with the prior art, the present invention provides a fixed injection needle with the following beneficial effects:

[0014] 1. The utility model connects the injection needle through the front end of the injection tube, a reinforcement structure is fixedly provided on one side of the injection tube, the inner end of the injection needle is flush with the inner port of the sleeve, and a first sliding sleeve is fixedly provided in the sleeve outside the injection needle to slide with the injection tube and the reinforcement structure. When in use, the first sliding sleeve is conducive to sliding guidance and limiting the front end of the injection tube, ensuring that the injection needle punctures in a straight line. The reinforcement structure can increase the strength of the injection tube, which is conducive to pushing the outer end forward for injection.

[0015] 2. The utility model extends the outer sheath tube through the outer end of the injection tube and the reinforcement structure and is fixedly connected to the injection port. The injection tube inside the injection port and the sliding sleeve on the reinforcement structure are provided with a second sliding sleeve. The inner end of the second sliding sleeve is fixedly connected to the outer end of the handle. When in use, the second sliding sleeve can play a sliding guiding and limiting role for the injection tube and the reinforcement structure at the outer end to avoid shaking of the injection tube, and the injection port is easy to connect with the syringe.

[0016] 3. The utility model is provided with a boss fixed on the handle on the front side of the slider, and a first limit bolt is screwed backward on the boss. When in use, the staff pulls back the slider to clamp and fix the gastrointestinal arm and lift it up, and then screws the limit bolt backward to support the slider, which has a pushing and limiting effect on the slider, so that the clamp blades continue to remain in a clamped state, which is conducive to the subsequent injection of the injection needle.

[0017] 4. The utility model also has a second limiting bolt with an extruded steel wire screwed inward on one side of the second sliding sleeve. When in use, after the injection port is connected to the syringe, it is pushed forward to achieve puncture. Then the injection tube can be limited by screwing the second limiting bolt, and then the injection can be performed, which is beneficial to the accuracy of the injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0019] Figure 1 The figure is a schematic diagram of the three-dimensional structure of an existing endoscope clip;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the first embodiment of the present utility model;

[0021] Figure 3 It is an enlarged structural diagram of the injection structure;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the front end of the injection structure;

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the rear end of the injection structure;

[0024] Figure 6 This is a schematic cross-sectional view of the second embodiment of the present invention.

[0025] Indications in the figure: 1. Outer sheath; 2. Cannula; 3. Forceps blade; 4. Handle; 41. Strip slide; 42. Boss; 43. First limit bolt; 44. Pull plate; 45. Pull rope; 5. Slider; 51. Cylindrical tube; 52. Annular protrusion; 6. Second slide; 61. Second slide hole; 7. Injection structure; 71. Injection tube; 72. Injection needle; 73. Steel wire; 74. First slide; 75. Liquid injection port; 8. Second limit bolt. DETAILED DESCRIPTION

[0026] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention. Example 1

[0027] like Figures 2 to 5 As shown, a fixed injection needle with an overall length of 1800mm includes an outer sheath 1 (the outer sheath 1 has a diameter of 2.3mm and can pass through an endoscopic biopsy channel with a diameter of 2.8mm). A cannula 2 is fixedly mounted on the inner end of the outer sheath 1. A pair of closable forceps 3 are mounted on the inner end of the cannula 2. A pull cord 45 for pulling the forceps 3 is disposed in the outer sheath 1. A handle 4 (hollow cylindrical) is mounted on the outer end of the outer sheath 1. A slider 5 that can slide back and forth is mounted on the handle 4. A pull plate 44 is disposed inside the slider 5 and is fixedly connected to the outer end of the pull cord 45. The slider 5 includes a cylindrical barrel 51 that slides over the handle 4 and an annular protrusion 52 on the outer surface of the cylindrical barrel 51 on both sides. Strip slides 41 are embedded on the left and right sides of the handle. Pull plates 44 are slidably disposed in the strip slides 41. The left and right ends of the pull plates 44 are fixedly connected to the inner surface of the slider 5. The outer sheath 1 is provided with an injection structure 7 which can slide back and forth. The injection structure 7 includes an injection tube 71. The front end of the injection tube 71 is connected to an injection needle 72. A reinforcement structure is fixed on one side of the injection tube 71. The inner end of the injection needle 72 is flush with the inner port of the sleeve 2. A first sliding sleeve 74 is fixed in the sleeve 2 outside the injection needle 72 and is slidably matched with the injection tube 71 and the reinforcement structure (see FIG. 1 ). Figure 4 The outer ends of the injection tube 71 and the reinforcement structure extend out of the outer sheath 1 and are fixedly connected to the injection port 75. The injection tube 71 and the reinforcement structure on the inner side of the injection port 75 are provided with a second sliding sleeve 6. The inner end of the second sliding sleeve 6 is fixedly connected to the outer end of the handle 4. A boss 42 is fixedly provided on the handle 4 on the front side of the slider 5. A first limiting bolt 43 is screwed backward on the boss 42 (see Figure 2 ).

[0028] The reinforcement structure is a steel wire 73 , which is bonded and fixed to the side of the injection tube 71 .

[0029] The first sliding sleeve 74 is fixed to the inner surface of the sleeve 2 on the lower side of the pull rope 45, so that the pull rope 45 is separated from the injection tube 71.

[0030] The first sliding sleeve 74 is cylindrical and has a first slideway hole (not separately marked) embedded therein that cooperates with the injection tube 71 and the steel wire 73 .

[0031] The second sliding sleeve 6 is cylindrical, and its inner end surface is fixedly connected to the outer end surface of the handle 4 . A second slideway hole 61 is embedded in the lower side of the center position, which is slidably matched with the injection tube 71 and the steel wire 73 .

[0032] During use, the first sliding sleeve 74 facilitates sliding guidance and limiting of the front end of the injection tube 71, ensuring that the injection needle 72 punctures in a straight line. The reinforced structure increases the strength of the injection tube, facilitating the forward movement of the outer end for injection. The second sliding sleeve 6 can also provide sliding guidance and limiting for the injection tube 71 and the reinforced structure at the outer end, preventing the injection tube 71 from shaking. The injection port 75 facilitates connection with the syringe (not shown). After the staff member pulls back the slider 5 so that the forceps 3 clamps the gastrointestinal arm and lifts it, they can then tighten the limit bolt 43 backward to support the annular protrusion 52 of the slider 5, pushing and limiting the slider 5, so that the forceps 3 remain in a closed state, facilitating subsequent injection of the injection needle 72. Example 2

[0033] like Figure 6 As shown, a second limiting bolt 8 for squeezing a steel wire 73 is screwed inwardly on one side of the second sliding sleeve 6 (to prevent the second limiting bolt 8 from directly squeezing the injection tube 71 and flattening the injection tube 71).

[0034] During use, after the injection port 75 is connected to the syringe, it is pushed forward to achieve puncture, and then the injection tube 71 can be limited by screwing the second limiting bolt 8, and then the injection can be performed, which is beneficial to the accuracy of the injection.

[0035] The components used in the present invention are all universal standard components or components known to those skilled in the art, and their structures and principles are well known to those skilled in the art.

[0036] It should be noted that, in this document, the directions or positional relationships indicated by the terms "first", "second", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0037] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not intended to limit the conditions under which the present invention can be implemented. Any structural modifications, changes in proportional relationships, or adjustments in size should still fall within the scope of the technical contents disclosed in this utility model without affecting the effects and purposes that can be achieved by the present utility model.

[0038] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixed injection needle, comprising an outer sheath, a cannula fixedly disposed at the inner end of the outer sheath, a pair of closable clamp blades disposed at the inner end of the cannula, a drawstring disposed in the outer sheath for pulling the clamp blades, a handle disposed at the outer end of the outer sheath, a slider disposed on the handle for sliding back and forth, a pull plate disposed within the slider, the pull plate being fixedly connected to the outer end of the drawstring, and characterized in that: An injection structure is provided in the outer sheath tube, which can slide back and forth. The injection structure includes an injection tube, the front end of the injection tube is connected to the injection needle, a reinforcement structure is fixedly provided on one side of the injection tube, the inner end of the injection needle is flush with the inner port of the sleeve, and a first sliding sleeve is fixedly provided in the sleeve outside the injection needle to slide with the injection tube and the reinforcement structure; The outer ends of the injection tube and the reinforcement structure extend out of the outer sheath and are fixedly connected to the injection port. The injection tube and the reinforcement structure on the inner side of the injection port are provided with a second sliding sleeve, and the inner end of the second sliding sleeve is fixedly connected to the outer end of the handle. A boss is fixedly provided on the handle at the front side of the slider, and a first limiting bolt is screwed backward on the boss.

2. The fixed injection needle according to claim 1, characterized in that: The reinforcement structure is a steel wire, which is bonded and fixed to the side of the injection tube.

3. The fixed injection needle according to claim 1, characterized in that: The first sliding sleeve is fixed to the inner surface of the sleeve on the lower side of the pull rope.

4. The fixed injection needle according to claim 1, characterized in that: The first sliding sleeve is cylindrical and has a first slideway hole embedded therein that matches the injection tube and the steel wire.

5. The fixed injection needle according to claim 1, characterized in that: The second sliding sleeve is cylindrical, with an inner end surface fixedly connected to the outer end surface of the handle, and a second slide hole that slides with the injection tube and the steel wire is embedded on the lower side of the center position.

6. The fixed injection needle according to claim 1, characterized in that: A second limiting bolt with an extruded steel wire is screwed inwardly on one side of the second sliding sleeve.

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