Arcuate anti-blocking fascial capsule under anesthesia injection needle

Abstract

The utility model relates to medical tool field especially arc shape prevents the blocked fascia bursa lower anesthetic injection needle head, including needle head structure, needle head structure includes the connecting head, the lower end edge department of connecting head is fixedly connected with the limiting ring, the upper end opening inner wall of connecting head is fixedly connected with first needle tube, the upper end opening of first needle tube is fixedly connected with second needle tube, the inner wall of second needle tube is linked with the inner wall of first needle tube, and the outer wall of two auxiliary injection holes of asymmetry is opened in the front and back two ends of second needle tube, and second needle tube presents the circular arc curved design, the utility model discloses the needle tube of the circular arc curved design of additional installation, can be more close to the eyeball form when operating needle, effectively reduces the resistance in the fascia bursa lower injection operation process, and the auxiliary injection hole of additional installation avoids the operation difficulty caused by the single opening obstruction of needle head front end, thereby improves the efficiency and safety of anesthetic operation, reduces the risk of complication.

Description

Technical Field

[0001] This utility model belongs to the field of medical tools, specifically relating to an arc-shaped, anti-obstruction subfascial anesthesia injection needle. Background Technology

[0002] In the field of ophthalmic surgery, subfascial infiltration anesthesia is an important anesthetic technique with significant advantages such as high safety, short learning curve, and the ability to be supplemented intraoperatively. It has been widely used in clinical practice. This anesthetic technique involves injecting anesthetic drugs into the space under the fascia of the eyeball to anesthetize the extraocular muscles and intraocular structures, providing favorable conditions for the smooth progress of ophthalmic surgery.

[0003] Currently, in clinical practice, medical staff have to use existing viscoelastic injection tips as a substitute. This substitution method has many problems: On the one hand, existing viscoelastic injection tips are usually designed for injecting viscoelastic agents, not optimized for injecting anesthetic drugs. Because these needles have a small diameter, they generate greater resistance when injecting anesthetic drugs. The greater injection resistance forces the operator to move the injection site during the injection process in an attempt to overcome the resistance. This process undoubtedly increases the risk of conjunctival edema. Conjunctival edema not only affects the anesthetic effect, leading to incomplete anesthesia and increasing the patient's intraoperative pain, but also brings inconvenience to subsequent surgical operations, which may affect the surgical field, increase the difficulty of the operation, and may even lead to surgical complications. Utility Model Content

[0004] To overcome the problem of increased resistance during use of anesthetic injection needles, which increases the risk of conjunctival edema, an arc-shaped, anti-obstruction subfascial bursa anesthetic injection needle is proposed.

[0005] The technical solution of this utility model is as follows: an arc-shaped anti-obstruction subfascial anesthesia injection needle, including a needle structure, the needle structure including a connector, a limiting ring fixedly attached to the lower edge of the connector, a first needle tube fixedly attached to the inner wall of the upper opening of the connector, a second needle tube fixedly attached to the upper opening of the first needle tube, the inner wall of the second needle tube communicating with the inner wall of the first needle tube, two asymmetrical auxiliary injection holes penetrating through the outer wall of the second needle tube, the distances between the two auxiliary injection holes and the upper opening of the second needle tube being two millimeters and three millimeters respectively, the second needle tube having an arc-shaped structure, the upper opening of the second needle tube being duckbill-shaped, and a protective structure installed at the lower end of the needle structure.

[0006] Furthermore, the total length of the second needle tube is 24 millimeters, and the inner diameter of both the first and second needle tubes is 0.7 millimeters. Both the first and second needle tubes are made of medical-grade stainless steel.

[0007] Furthermore, a fastening sleeve is fixed to the inner wall of the connector. The connector and the limiting ring are made of medical-grade plastic, while the fastening sleeve is made of medical-grade rubber.

[0008] Furthermore, the protective structure includes a fixing sleeve, a limiting sleeve, and a fixing cap. The fixing sleeve is fixed to the upper end of the syringe, the limiting sleeve is fixed to the center of the upper end of the fixing sleeve, and the fixing cap is threaded onto the outer wall of the upper end of the limiting sleeve.

[0009] Furthermore, the inner diameter of the limiting sleeve is larger than the outer diameter of the connector, and the lower inner wall of the fixing cover fits against the upper end of the limiting ring. The fixing sleeve, the limiting sleeve, and the fixing cover are all made of medical-grade metal.

[0010] Furthermore, a protective structure is installed under the needle structure. The protective structure includes a fixed sleeve II, a limiting sleeve II, and a fixing ring. The fixed sleeve II is sleeved on the upper end of the syringe. The limiting sleeve II is fixedly connected to the center of the upper end of the fixed sleeve II, and the fixing ring is fixedly connected to the upper end of the limiting sleeve II.

[0011] Furthermore, the inner wall of the second fixing sleeve is fixed with several anti-slip posts that are equidistantly arranged around it. The inner wall of the second limiting sleeve is in contact with the outer wall of the connector. The inner diameter of the fixing ring is smaller than the outer diameter of the connector. The second fixing sleeve, the anti-slip posts, the second limiting sleeve, and the fixing ring are all made of medical-grade rubber.

[0012] The beneficial effects of this invention are as follows: The connector can support and fix the first and second needle tubes, improving the way the connector fixes the first and second needle tubes to the syringe. The arc-shaped second needle tube can better conform to the shape of the eyeball during needle insertion. If the upper outlet of the second needle tube is blocked by the fascia tissue around the eyeball, causing poor flow, the fluid flow rate of the auxiliary injection hole will increase. When the fluid accumulates at the end of the second needle tube and a sufficient cavity is formed, the blockage at the upper outlet of the second needle tube will be relieved. Compared with existing anesthesia injection needles, the added arc-shaped needle tube can better conform to the shape of the eyeball during needle insertion, effectively reducing the resistance during subfascial injection. The added auxiliary injection hole avoids the operational difficulties caused by the blockage of a single opening at the tip of the needle, thereby improving the efficiency and safety of anesthesia and reducing the risk of complications. Attached Figure Description

[0013] Figure 1 The diagram shown is a three-dimensional structural disassembly diagram of this utility model;

[0014] Figure 2 The diagram shown is a three-dimensional disassembled schematic of the needle structure of this utility model.

[0015] Figure 3 The diagram shown is a three-dimensional, disassembled view of the protective structure of this utility model.

[0016] Figure 4The diagram shown is a three-dimensional disassembled view of the protective structure of this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1. Needle structure; 101. Connector; 102. First needle tube; 103. Second needle tube; 104. Auxiliary injection hole; 105. Limiting ring; 106. Fastening sleeve; 201. Fixing sleeve one; 202. Limiting sleeve one; 203. Fixing cap; 301. Fixing sleeve two; 302. Anti-slip post; 303. Limiting sleeve two; 304. Fixing ring. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Among the feasible methods discovered in this field, ophthalmic anesthesia injection techniques have long faced the dual challenges of operational resistance and tissue damage. Traditional straight needle designs, when used for subfascial injections, often result in increased tissue friction during insertion due to insufficient matching between the needle shape and the curvature of the eyeball. This not only increases the workload for medical staff but may also lead to complications such as subconjunctival hemorrhage due to repeated adjustments to the needle angle. In current clinical practice, some surgeons attempt to manually bend ordinary needles to adapt to the curvature of the eyeball; however, such non-standardized operations carry the risk of uncontrolled needle tip shape, metal fatigue fracture, and the inability to establish a stable injection channel.

[0020] Among the currently available feasible technologies for addressing needle occlusion, early solutions often involved increasing the needle tip diameter, but this significantly increases the probability of tissue trauma. While subsequent side-hole designs can distribute injection pressure to some extent, their lack of biomechanical optimization in placement often leads to an imbalance in flow between the side holes and the main hole, especially when fascial tissue tension changes, potentially causing local drug accumulation or incomplete anesthesia. Some studies have attempted to coat the needle surface with a lubricating coating, but this coating is prone to detachment during repeated punctures and may trigger allergic reactions, significantly limiting its clinical application.

[0021] In the feasible methods discovered in this field, the selection of materials for medical needles always follows the principle of balancing strength and toughness. While traditional stainless steel possesses good rigidity, it is prone to lattice distortion during curved bending, leading to stress concentration at the needle tip. Titanium alloys, which have emerged in recent years, offer better biocompatibility, but their processing costs are high, and their elastic modulus differs significantly from that of intraocular tissue, potentially causing additional tissue irritation during injection due to vibration transmission. In existing technologies, the connection between the needle tube and the connector often employs interference fit or adhesive bonding. The former is prone to loosening during high-pressure injection, while the latter poses a risk of chemical residue.

[0022] Among the currently available feasible technologies, needle protection structure design has long focused on physical fixation. Early protective sleeves were mostly simple rigid plastic structures, only providing basic needle coverage and failing to offer dynamic stability support during injection. While subsequent developments of elastic snap-fit ​​structures enhanced fixation, repeated opening and closing of the snaps could lead to plastic deformation, affecting lifespan. Some high-end protective devices use magnetic connections, which improve installation convenience, but magnetic field interference may affect the metering systems of precision injection instruments, limiting their widespread adoption in clinical settings.

[0023] Among the currently available feasible technologies, the reliability of the needle-syringe connection directly affects the anesthetic effect. Traditional Luer connectors are prone to loosening during high-pressure injection, leading to drug leakage or dosage deviation. While threaded connections improve stability, excessive tightening may cause needle deformation, while excessive loosening fails to create an effective seal. Some quick-plug interfaces use a slot design, but the wear of the slots increases with repeated use, eventually leading to connection failure, especially in scenarios requiring multiple intraoperative injections, where reliability issues are more pronounced.

[0024] Among the feasible methods discovered in this field, the ergonomic design of the needle structure has long been neglected. The linear grip of traditional straight needles presents a spatial contradiction with the anatomical position of the eyeball, requiring the surgeon to maintain an unnatural wrist posture during operation, which can easily lead to cumulative fatigue. Especially during prolonged surgeries, repetitive movements can cause occupational musculoskeletal injuries. Although existing improved handles have added anti-slip textures, they have not fundamentally solved the problem of optimizing the force transmission path, resulting in limited improvement in operational stability.

[0025] Among the currently available feasible technologies, the hydrodynamic optimization of multi-orifice injection systems lacks a dynamic adjustment mechanism. Static orifice layouts are insufficiently adaptable to anesthetic drugs of varying viscosities; high-viscosity drugs easily lead to attenuation of flow through side orifices, while low-viscosity drugs may cause jet-like injections, increasing tissue impact damage. Some studies have attempted to construct temperature-controlled variable-aperture structures using shape memory alloys, but the temperature response speed is difficult to match with the rhythm of anesthesia procedures, limiting practical application effectiveness.

[0026] Among the feasible methods discovered in this field, lightweight design of the needle protection structure is currently a technological bottleneck. While existing metal protective sleeves can provide reliable fixation, the increased instrument weight can affect the operator's handling, especially when fine adjustments to the needle insertion angle are required, as inertia may lead to positioning errors. Although the application of polymer composite materials can reduce weight, the creep properties of the materials may cause the fixation force to weaken over long-term use, failing to meet the performance consistency requirements after repeated sterilization.

[0027] Among the currently discovered feasible technologies, the synergistic design of needles and anesthetic drugs has not received sufficient attention. Different anesthetic drugs exhibit significant differences in their physicochemical properties, such as viscosity and diffusion coefficient. Existing needle structures have not been optimized for drug characteristics, potentially leading to uneven drug distribution or delayed onset of action. The particulate nature of some long-acting anesthetic drugs easily causes needle clogging, but current anti-clogging technologies do not consider the interaction between drug components and pore structure, lacking personalized solutions.

[0028] As can be seen from the above review of existing technologies, there are obvious technical pain points in the field of ophthalmic subfascial anesthesia injection in terms of needle morphology, anti-blockage mechanism, material application, and protective structure. This utility model systematically solves the shortcomings of existing technologies through the innovative combination of arc-shaped needle tube and asymmetric auxiliary hole, as well as multi-dimensional structural optimization, providing a safer and more efficient solution for clinical anesthesia operations.

[0029] Please see Figures 1-4 The arc-shaped anti-obstruction subfascial anesthesia injection needle includes a needle structure 1, which includes a connector 101. A limiting ring 105 is fixed to the lower edge of the connector 101. A first needle tube 102 is fixed to the inner wall of the upper opening of the connector 101. A second needle tube 103 is fixed to the upper opening of the first needle tube 102. The inner wall of the second needle tube 103 is connected to the inner wall of the first needle tube 102. Two asymmetrical auxiliary injection holes 104 are opened through the outer wall of the second needle tube 103. The distances between the two auxiliary injection holes 104 and the upper opening of the second needle tube 103 are two millimeters and three millimeters, respectively. The second needle tube 103 has an arc-shaped structure, and the upper opening of the second needle tube 103 is duckbill-shaped. A protective structure is installed at the lower end of the needle structure 1.

[0030] The connector 101 can support and fix the first needle tube 102 and the second needle tube 103. This improves the way the connector 101 fixes the first needle tube 102 and the second needle tube 103 to the syringe. The arc-shaped second needle tube 103 can better conform to the shape of the eyeball during needle insertion, effectively reducing resistance during subfascial injection. If the upper outlet of the second needle tube 103 is blocked by the fascia tissue around the eyeball, causing poor flow, the fluid flow rate of the auxiliary injection hole 104 will increase. When the fluid accumulates at the end of the second needle tube 103 and a sufficient cavity is formed, the blockage at the upper outlet of the second needle tube 103 will be relieved. This avoids operational difficulties caused by a single opening at the tip of the needle, thereby improving the efficiency and safety of the anesthesia operation and reducing the risk of complications.

[0031] Please see Figure 2In this embodiment, the total length of the second needle tube 103 is 24 mm. The inner diameter of both the first needle tube 102 and the second needle tube 103 is 0.7 mm. The first needle tube 102 and the second needle tube 103 are made of medical stainless steel. During use, the medical stainless steel first needle tube 102 and the second needle tube 103 can ensure strength and prevent breakage during use. The arc-shaped second needle tube 103 of appropriate length can fit the eyeball to avoid breakage and maintain a suitable injection angle. The inner wall of the connector 101 is fixed with a fastening sleeve 106. The connector 101 and the limiting ring 105 are made of medical plastic, and the fastening sleeve 106 is made of medical rubber. During use, the fastening sleeve 106 can fit the fixing post of the syringe. The compression reaction force improves the firmness of the connector 101, thereby improving the stability of the needle structure 1 during operation.

[0032] Example 1: Please refer to Figure 3 In this embodiment, the protective structure includes a fixing sleeve 201, a limiting sleeve 202, and a fixing cap 203. The fixing sleeve 201 is fixed to the upper end of the syringe, and the limiting sleeve 202 is fixed to the center of the upper end of the fixing sleeve 201. The fixing cap 203 is threaded onto the outer wall of the upper end of the limiting sleeve 202. In use, the protective structure can protect and fix the needle structure 1. The fixing cap 203, which is fixed by the thread, can fit and press against the limiting ring 105 to avoid damage caused by injection resistance. This causes the needle structure 1 to detach from the syringe, improving safety during use. The inner diameter of the limiting sleeve 202 is larger than the outer diameter of the connector 101. The lower inner wall of the fixing cover 203 fits against the upper end of the limiting ring 105. The fixing sleeve 201, the limiting sleeve 202, and the fixing cover 203 are all made of medical-grade metal. During use, the fixing cover 203, which is installed by threads, can ensure a firm fixation. Moreover, the protective structure made of metal can be easily cleaned and disinfected, allowing for multiple uses and improving environmental friendliness.

[0033] Example 2: Please refer to Figure 4In this embodiment, the protective structure includes a fixing sleeve 301, a limiting sleeve 303, and a fixing ring 304. The fixing sleeve 301 is fitted onto the upper end of the syringe. The limiting sleeve 303 is fixedly connected to the center of the upper end of the fixing sleeve 301. The fixing ring 304 is fixedly connected to the upper end of the limiting sleeve 303. In use, the protective structure provides another method of protection for the needle structure 1. The fixing sleeve 301 can be fitted and fixed to the outer wall of the upper end of the syringe, and the limiting sleeve 303 can limit and fix the needle structure 1, providing protection for the needle structure 1 and ensuring stability. The inner wall of the fixing sleeve 301 is fixedly connected to... Several anti-slip posts 302 are equidistantly arranged around the connector 101. The inner wall of the limiting sleeve 303 fits against the outer wall of the connector 101. The inner diameter of the fixing ring 304 is smaller than the outer diameter of the connector 101. The fixing sleeve 301, anti-slip posts 302, limiting sleeve 303, and fixing ring 304 are all made of medical-grade rubber. During use, the anti-slip posts 302 can improve the stability of the fixing sleeve 301, and the fixing ring 304 can limit and fix the connector 101 to prevent it from detaching from the syringe. The rubber protective structure can be easily installed and disassembled, and can quickly fix the needle structure 1, improving the convenience of use.

[0034] When using the protective structure, firstly, fix the fixing sleeve 201 with glue to the upper end of the syringe. Then, insert the connector 101 of the needle structure 1 into the fixing post of the syringe. Then, rotate and tighten the fixing cover 203 so that the lower inner wall of the fixing cover 203 is in contact with and presses against the limiting ring 105. Alternatively, when using the protective structure, firstly, insert the connector 101 of the needle structure 1 into the fixing post of the syringe. Then, let the fixing ring 304 and the limiting sleeve 303 pass through the second needle tube 103, the first needle tube 102, and the connector 101. Then, put the fixing sleeve 301 on the upper outer wall surface of the syringe. Then, pull the fixing sleeve 301 down so that the limiting sleeve 303 is in contact with the fixing tube 304 and presses against the outer wall of the connector 101.

[0035] Through the above steps, the connector 101 can support and fix the first needle tube 102 and the second needle tube 103, which can improve the connection of the connector 101 to fix the first needle tube 102 and the second needle tube 103 on the syringe. The arc-shaped second needle tube 103 can fit the shape of the eyeball better during the needle insertion operation, effectively reducing the resistance during the subfascial injection operation. If the upper outlet of the second needle tube 103 is blocked by the fascia tissue around the eyeball, resulting in poor flow, the liquid flow rate of the auxiliary injection hole 104 will increase. When the liquid accumulates at the end of the second needle tube 103 and a sufficient cavity is formed, the blockage at the upper outlet of the second needle tube 103 will be relieved. This solves the problem that the anesthesia injection needle will generate greater resistance during use, thereby increasing the risk of conjunctival edema.

Claims

1. An arc-shaped, anti-obstruction subfascial anesthesia injection needle, comprising a needle structure (1), characterized in that: The needle structure (1) includes a connector (101), a limiting ring (105) is fixedly attached to the lower edge of the connector (101), a first needle tube (102) is fixedly attached to the inner wall of the upper opening of the connector (101), a second needle tube (103) is fixedly attached to the upper opening of the first needle tube (102), the inner wall of the second needle tube (103) is connected to the inner wall of the first needle tube (102), two asymmetrical auxiliary injection holes (104) are opened through the outer wall of the second needle tube (103), the distance between the two auxiliary injection holes (104) and the upper opening of the second needle tube (103) is two millimeters and three millimeters respectively, the second needle tube (103) has an arc-shaped structure, the upper opening of the second needle tube (103) is duckbill-shaped, and a protective structure is installed at the lower end of the needle structure (1).

2. The arc-shaped anti-obstruction subfascial anesthesia injection needle according to claim 1, characterized in that: The total length of the second needle tube (103) is 24 mm. The inner diameter of both the first needle tube (102) and the second needle tube (103) is 0.7 mm. The first needle tube (102) and the second needle tube (103) are made of medical stainless steel.

3. The arc-shaped anti-obstruction subfascial anesthesia injection needle according to claim 2, characterized in that: The inner wall of the connector (101) is fixed with a fastening sleeve (106). The connector (101) and the limiting ring (105) are made of medical plastic, and the fastening sleeve (106) is made of medical rubber.

4. The arc-shaped anti-obstruction subfascial anesthesia injection needle according to claim 1, characterized in that: The protective structure includes a fixing sleeve (201), a limiting sleeve (202), and a fixing cover (203). The fixing sleeve (201) is fixed to the upper end of the syringe. The limiting sleeve (202) is fixed to the center of the upper end of the fixing sleeve (201). The fixing cover (203) is threaded on the outer wall of the upper end of the limiting sleeve (202).

5. The arc-shaped anti-obstruction subfascial anesthesia injection needle according to claim 4, characterized in that: The inner diameter of the limiting sleeve (202) is larger than the outer diameter of the connector (101). The lower inner wall of the fixing cover (203) is attached to the upper end of the limiting ring (105). The fixing sleeve (201), the limiting sleeve (202) and the fixing cover (203) are all made of medical metal.

6. The arc-shaped anti-obstruction subfascial anesthesia injection needle according to claim 1, characterized in that: The protective structure includes a fixed sleeve 2 (301), a limiting sleeve 2 (303) and a fixing ring (304). The fixed sleeve 2 (301) is sleeved on the upper end of the syringe. The upper center of the fixed sleeve 2 (301) is fixedly connected to the limiting sleeve 2 (303), and the upper end of the limiting sleeve 2 (303) is fixedly connected to the fixing ring (304).

7. The arc-shaped anti-obstruction subfascial anesthesia injection needle according to claim 6, characterized in that: The inner wall of the fixing sleeve 2 (301) is fixed with several anti-slip posts (302) that are equidistantly arranged around it. The inner wall of the limiting sleeve 2 (303) is attached to the outer wall of the connector (101). The inner diameter of the fixing ring (304) is smaller than the outer diameter of the connector (101). The fixing sleeve 2 (301), the anti-slip posts (302), the limiting sleeve 2 (303) and the fixing ring (304) are all made of medical rubber.

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