Injector with automatic injection cap used in epidural space
By using an automatic injection cap, the problems of cleaning difficulties and inconvenience caused by springs are solved, enabling automatic injection and accurate puncture in the epidural space, thus improving the convenience and safety of operation.
Patent Information
- Application Number
- CN202422984278.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2034-12-04
AI Technical Summary
In existing epidural puncture syringes, the spring is prone to grease buildup, making cleaning difficult and contaminating the medication, increasing manufacturing costs. Furthermore, the increased size and weight of the syringe lead to inconvenience in operation.
An automatic injection cap made of medical-grade elastic rubber is used. The automatic injection cap generates thrust through elastic deformation, enabling the puncture needle tip to reach the epidural space and automatically inject the drug, thus avoiding the use of a spring.
It achieves non-toxic and pollution-free automated injection, simplifies the cleaning process, reduces manufacturing costs, improves operational convenience, and ensures puncture accuracy and safety.
Smart Images
Figure CN223944460U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of medical apparatus and instruments, especially relates to an injector with an automatic injection cap in an epidural space. BACKGROUND
[0002] When performing epidural puncture, the epidural puncture needle needs to pass through the skin, the subcutaneous tissue, the supraspinal ligament, the interspinal ligament and the yellow ligament in sequence to reach the epidural space, at which time the feeling of the injector being pushed empty can often be felt, and experienced doctors can determine that the tip of the puncture needle reaches the epidural space according to the feeling of the tip of the puncture needle breaking through the yellow ligament, inexperienced doctors cannot accurately grasp the feeling of the injector being pushed empty, and if the puncture is too shallow, the yellow ligament cannot be penetrated, and the epidural space cannot be reached; if the puncture is too deep, the dura mater is easily penetrated, and the spinal cord or nerves are damaged, and whether the puncture is successful depends entirely on the feeling and experience of the operator, please refer to Figure 6 .
[0003] According to the epidural puncture automatic resistance disappearance device disclosed in the patent network (authorized publication number: CN87209815U), the piston and the pull rod are connected and installed in the injection needle cylinder, the spring is sleeved on the pull rod, the pull rod passes through the circular hole in the center of the cylinder cover, then the cylinder cover is screwed on the tail of the injection needle cylinder, the tail of the pull rod is connected with the handle. The injection needle cylinder is a common injection needle cylinder with a thread opened at the tail; the piston is cylindrical and connected with the pull rod, the tail of the pull rod is provided with a thread, and the diameter of the piston is matched with the inner diameter of the injection needle cylinder; the tail of the pull rod is provided with a thread and connected with the handle; the spring is sleeved on the pull rod and installed between the piston and the cylinder cover; the handle is provided with an internal thread and connected with the tail of the pull rod; the cylinder cover is provided with a thread and a circular hole in the center, and the pull rod passes through the circular hole, and the cylinder cover is connected with the tail of the needle cylinder.
[0004] According to the above description, the applicant believes that the following problems exist:
[0005] In the use process of the utility model, the spring is sleeved on the pull rod, the pull rod passes through the circular hole in the center of the cylinder cover, then the cylinder cover is screwed on the tail of the injection needle cylinder, and the tail of the pull rod is connected with the handle. Since the spring is prone to oil attachment after processing, it is troublesome to clean and easy to contaminate the injector and the liquid medicine, and placing the spring in the injector increases the product manufacturing cost. Moreover, since the spring has a length and weight after compression, the injector needs to be increased in length compared with the injector used in normal times when 4ml of liquid medicine is drawn, which inevitably leads to an increase in the weight and volume of the injector, bringing inconvenience to the operation of doctors, and therefore the injector with the automatic injection cap in the epidural space needs to be improved to solve the above problems. UTILITY MODEL CONTENTS
[0006] In order to overcome the prior art spring processing out of easy to attach grease, cleaning is more troublesome, easy to pollute the syringe and liquid, and at the same time, the spring is placed in the syringe, which increases the product manufacturing cost and the operation inconvenience caused by the increase of the volume and weight of the syringe.
[0007] The technical scheme of the utility model discloses: for the epidural cavity has the syringe of automatic push injection cap, including needle cylinder, the push rod of inserting in needle cylinder, needle cylinder includes piston port, the medicine outlet, is equipped with the edge of the radial outside convex to needle cylinder at piston port, the side of push rod away from needle cylinder is equipped with the pressing plate, and the automatic push injection cap is connected to the edge and the pressing plate, and the automatic push injection cap is the cylindrical structure, and the automatic push injection cap is equipped with the recess along the axle core, and the recess includes the groove bottom, and the recess of automatic push injection cap is integrative and forms the annular edge of one side away from the groove bottom, and the annular edge can form the mounting hole, and the diameter of recess is greater than the diameter of mounting hole, and the diameter of edge is greater than the diameter of recess, and the automatic push injection cap is made of elastic material.
[0008] As preferred, the side of the edge close to the groove bottom can be attached to the edge, and the groove bottom can be attached to the pressing plate, when the edge is attached to the edge, and the groove bottom is attached to the pressing plate, the groove bottom can pull the pressing plate to the edge direction.
[0009] As preferred, the mounting hole can pass through the pressing plate and the edge, and the hole wall of the mounting hole can be in contact with the outer wall of the needle cylinder.
[0010] As preferred, on the automatic push injection cap, the cap wall is located between the groove bottom and the edge, and the cap wall can be stretched and contracted.
[0011] As preferred, when the groove bottom moves to 10mm away from the edge, the groove bottom can apply 2.5N of thrust to the pressing plate; when the groove bottom moves to 20mm away from the edge, the groove bottom can apply 3N of thrust to the edge; when the groove bottom moves to 30mm away from the edge, the groove bottom can apply 3.5N of thrust to the pressing plate; when the groove bottom moves to 40mm away from the edge, the groove bottom can apply 4N of thrust to the pressing plate.
[0012] As preferred, the needle cylinder is made of transparent material, and the needle cylinder outer surface is provided with 4ml scale line, the pressing plate can drive the groove bottom to move away from the piston port, and when the groove bottom moves to 40mm away from the piston port, 4ml of liquid can be sucked in the needle cylinder.
[0013] As preferred, the groove bottom is closely attached to the pressing plate, the middle region of the groove bottom is provided with a perforation, and the diameter of the perforation is smaller than the diameter of the pressing plate.
[0014] The utility model discloses an automatic push injection cap which is made of medical grade elastic rubber product, and the automatic push injection cap is non-toxic and non-polluted, and the annular edge completely matches with the edge, and the groove bottom matches with the pressing plate, so that the automatic push injection cap is not easy to fall off from the syringe. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is overall structure schematic diagram of the utility model;
[0016] Figure 2 It is edge structure schematic diagram of the utility model;
[0017] Figure 3 It is cap wall structure schematic diagram of the utility model;
[0018] Figure 4 It is pressing plate structure schematic diagram of the utility model;
[0019] Figure 5 It is perforated structure schematic diagram of the utility model;
[0020] Figure 6 It is puncture process schematic diagram of the utility model;
[0021] Figure 7 It is mounting hole structure schematic diagram of the utility model.
[0022] Mark explanation: 1, needle cylinder;11, piston mouth;111, edge;12, medicine outlet;2, push rod;21, pressing plate;3, automatic push injection cap;31, recess;311, groove bottom;3111, perforation;32, edge;321, mounting hole;33, cap wall. DETAILED DESCRIPTION
[0023] The utility model will be further explained in connection with the drawings and examples.
[0024] Please refer to Figures 1-7The utility model provides an embodiment: the syringe for epidural cavity has automatic push cap, including needle cylinder 1, the push rod 2 of inserting in needle cylinder 1, needle cylinder 1 includes piston mouth 11, medicine outlet 12, the edge 111 that protrudes to needle cylinder 1 radial outside is equipped with in piston mouth 11, the side of push rod 2 away from needle cylinder 1 is equipped with presser plate 21, and the automatic push cap 3 of connecting edge 111 and presser plate 21, the automatic push cap 3 is columnar structure, the automatic push cap 3 is equipped with recess 31 along the axle core, recess 31 includes groove bottom 311, and the recess 31 of automatic push cap 3 is integrally formed with annular flange 32 on the side away from groove bottom 311, and annular flange 32 can form mounting hole 321, the diameter of recess 31 is greater than the diameter of mounting hole 321, and the diameter of edge 111 is greater than the diameter of recess 31, and the automatic push cap 3 is made of elastic material, and through annular flange 32 is completely combined with edge 111, groove bottom 311 is combined with presser plate 21, so that the automatic push cap 3 is not easy to fall from the syringe, using the thrust of the elastic deformation of automatic push cap 3, realize when epidural puncture, puncture needle tip reaches epidural cavity, and the syringe filled with certain capacity liquid matched with epidural puncture needle, can automatically push injection medicine or physiological saline into epidural cavity, use automatic push cap 3 to realize the automatic, stable push injection of physiological saline etc.
[0025] Please refer to Figures 1-5In the embodiment, the edge 32 close to the groove bottom 311 can be attached to the edge 111, and the groove bottom 311 can be attached to the pressing plate 21. When the edge 32 is attached to the edge 111, and the groove bottom 311 is attached to the pressing plate 21, the groove bottom 311 can pull the pressing plate 21 towards the edge 111. The pressing plate 21 is pulled towards the edge 111 by the force applied by the groove bottom 311, achieving the injection effect. The installation hole 321 can pass through the pressing plate 21 and the edge 111, and the hole wall of the installation hole 321 can be in contact with the outer wall of the syringe 1. By passing through the pressing plate 21 and the edge 111 from the installation hole 321, the installation of the automatic injection device is achieved. The hole wall of the installation hole 321 is in contact with the outer wall of the syringe 1, preventing the edge 111 from falling out of the installation hole 321 during automatic injection. Between the groove bottom 311 and the edge 32 on the automatic injection cap 3 is the cap wall 33, which can be stretched and contracted. The cap wall 33 provides a force to the pressing plate 21 towards the edge 111. When the groove bottom 311 moves 10 mm away from the edge 32, the groove bottom 311 can apply a 2.5N pushing force to the pressing plate 21. When the groove bottom 311 moves 20 mm away from the edge 32, the groove bottom 311 can apply a 3N pushing force to the edge 32. When the groove bottom 311 moves 30 mm away from the edge 32, the groove bottom 311 can apply a 3.5N pushing force to the pressing plate 21. When the groove bottom 311 moves 40 mm away from the edge 32, the groove bottom 311 can apply a 4N pushing force to the pressing plate 21. Due to the partial hollowing on the cap wall 33, the hollowing is used to balance the air pressure inside and outside the automatic injection cap 3, but it needs to meet the following conditions: when the groove bottom 311 moves 10 mm away from the edge 32, the groove bottom 311 can apply a 2.5N pushing force to the pressing plate 21; when the groove bottom 311 moves 20 mm away from the edge 32, the groove bottom 311 can apply a 3N pushing force to the edge 32; when the groove bottom 311 moves 30 mm away from the edge 32, the groove bottom 311 can apply a 3.5N pushing force to the pressing plate 21; and when the groove bottom 311 moves 40 mm away from the edge 32, the groove bottom 311 can apply a 4N pushing force to the pressing plate 21, so as to achieve a safe and stable automatic injection during the entire process.
[0026] Please refer to Figures 2-7In the embodiment, the needle cylinder 1 is made of transparent material, the outer surface of the needle cylinder 1 is provided with 4ml scale, the pressing plate 21 can drive the groove bottom 311 to move away from the piston port 11, when the groove bottom 311 moves away from the piston port 11 by 40mm, 4ml liquid can be sucked in the needle cylinder 1, through the transparent material of the needle cylinder 1 and the corresponding 4ml scale, it is convenient for medical staff to easily use the syringe to suck physiological saline and other substances, when the needle cylinder 1 sucks 4ml physiological saline and other substances, the groove bottom 311 can exert a 4N pushing force on the pressing plate 21 to facilitate the release of 4ml physiological saline and other substances in the epidural space, when 4ml physiological saline and other substances are discharged from the needle cylinder 1, the medical staff should stop continuing to insert the needle deeper to protect the spinal cord, the groove bottom 311 is closely attached to the pressing plate 21, the middle region of the groove bottom 311 is provided with a perforation 3111, the diameter of the perforation 3111 is smaller than the diameter of the pressing plate 21, the device is easily disassembled and assembled, the modules of each part of the syringe are modularized, the contaminated and damaged parts are easily replaced, and the subsequent cleaning, disinfection and maintenance are more convenient.
[0027] In the work, the medical staff selects a new syringe from the sealed bag according to the needs or assembles the old syringe which has been modularly disassembled, cleaned and disinfected, first, the medical staff inserts the push rod 2 into the needle cylinder 1 along the piston port 11, then the medical staff opens the mounting hole 321 of the automatic push injection cap 3, puts the pressing plate 21 and the edge 111 into the automatic push injection cap 3, and attaches the edge 111 to the edge 111, the above steps can be completed by the doctor or the manufacturer, the medical staff inserts the medicine outlet 12 into the subcutaneous tissue of the patient first, then the medical staff holds the needle cylinder 1 to suck 4ml physiological saline and other substances, specifically, the medical staff holds the pressing plate 21 and the automatic push injection cap 3 at the position of the pressing plate 21, puts the needle cylinder 1 into the solution containing physiological saline and other substances, stretches the pressing plate 21 away from the edge 111, then puts the medicine outlet 12 on the needle cylinder 1, continues to hold the needle cylinder 1 and the medicine outlet 12 to penetrate deeper, when the medicine outlet 12 pierces the yellow ligament, there will be a sense of emptiness, when the medicine outlet 12 is placed in the epidural space, there will be a certain negative pressure in the epidural space to suck a certain amount of physiological saline and other liquid medicine from the medicine outlet 12, at the same time, the automatic push injection cap 3 automatically extrudes the pressing plate 21 to empty the physiological saline and other liquid medicine in the needle cylinder 1, the emptying here is stable and continuous, when the automatic push injection cap 3 starts to push, the doctor should immediately stop inserting deeper to avoid damaging the spinal cord, the medicine outlet 12 here is a puncture needle.
[0028] Through the above steps, the annular welt 32 is completely attached to the edge 111, and the groove bottom 311 is attached to the pressing plate 21, so that the automatic injection cap 3 is not easy to fall off from the syringe, and the automatic injection cap 3 is used to realize the automatic and smooth injection of physiological saline and other liquids. The diameter of the edge 111 is greater than the diameter of the groove 31, which can make the automatic injection cap 3 firmly cover the edge 111, prevent the automatic injection cap 3 from sliding off the edge 111, the automatic injection cap 3 is made of elastic material, and the elastic deformation of the automatic injection cap 3 is used to realize automatic injection. The deformation amount of the automatic injection cap 3 is proportional to the generated force, the automatic injection cap 3 can achieve the effect of smooth injection, the automatic injection cap 3 is made of medical grade elastic rubber product, which is non-toxic and non-polluting. To solve the problem that the grease is easy to adhere to the spring processed in the prior art, it is more troublesome to clean, easy to pollute the syringe and liquid medicine, and the spring is placed in the syringe, which increases the product manufacturing cost and brings the problem of inconvenient operation of doctors due to the increase of the volume and weight of the spring.
Claims
1. A syringe with an automatic injection cap for use in the epidural space, characterized in that: The device includes a syringe (1) and a plunger (2) inserted inside the syringe (1). The syringe (1) includes a piston port (11) and a drug outlet (12). The piston port (11) has an edge (111) that protrudes radially outward from the syringe (1). The plunger (2) has a pressing plate (21) on the side away from the syringe (1). An automatic injection cap (3) connects the edge (111) and the pressing plate (21). The automatic injection cap (3) has a columnar structure. A groove (31) is provided along the axis. The groove (31) includes a groove bottom (311). The side of the groove (31) away from the groove bottom (311) of the automatic injection cap (3) is integrally formed with an annular edge (32). The annular edge (32) can form a mounting hole (321). The diameter of the groove (31) is larger than the diameter of the mounting hole (321). The diameter of the edge (111) is larger than the diameter of the groove (31). The automatic injection cap (3) is made of elastic material.
2. The syringe with an automatic injection cap for intradural use according to claim 1, characterized in that: The side of the edge (32) close to the bottom of the groove (311) can fit the edge (111), and the bottom of the groove (311) can fit the pressing plate (21). When the edge (32) fits the edge (111) and the bottom of the groove (311) fits the pressing plate (21), the bottom of the groove (311) can pull the pressing plate (21) towards the edge (111).
3. The syringe with an automatic injection cap for use in the epidural space according to claim 2, characterized in that: The mounting hole (321) can pass through the pressing plate (21) and the edge (111), and the wall of the mounting hole (321) can contact the outer wall of the syringe (1).
4. The syringe with an automatic injection cap for use in the epidural space according to claim 2, characterized in that: On the automatic injection cap (3), the cap wall (33) is located between the bottom of the groove (311) and the edge (32), and the cap wall (33) is retractable.
5. The syringe with an automatic injection cap for use in the epidural space according to claim 4, characterized in that: When the groove bottom (311) moves 10 mm away from the edge (32), the groove bottom (311) can apply a 2.5 N thrust to the pressing plate (21); when the groove bottom (311) moves 20 mm away from the edge (32), the groove bottom (311) can apply a 3 N thrust to the edge (32); when the groove bottom (311) moves 30 mm away from the edge (32), the groove bottom (311) can apply a 3.5 N thrust to the pressing plate (21); when the groove bottom (311) moves 40 mm away from the edge (32), the groove bottom (311) can apply a 4 N thrust to the pressing plate (21).
6. The syringe with an automatic injection cap for use in the epidural space according to claim 1, characterized in that: The syringe (1) is made of transparent material. The outer surface of the syringe (1) has a 4 ml scale line. The pressing plate (21) can drive the bottom of the groove (311) to move away from the piston opening (11). When the bottom of the groove (311) moves 40 mm away from the piston opening (11), 4 ml of liquid can be drawn into the syringe (1).
7. The syringe with an automatic injection cap for intradural use according to claim 6, characterized in that: The bottom of the groove (311) is closely fitted to the pressing plate (21), and a through hole (3111) is provided in the middle area of the bottom of the groove (311). The diameter of the through hole (3111) is smaller than the diameter of the pressing plate (21).
Citation Information
Patent Citations
Automatic resistance eliminator for the puncture of hard-membrane exocoele
CN87209815U