A side-port needle automatic injector and injection assembly for endoscopic surgery

Abstract

The present application relates to a kind of side-port needle automatic injector and injection assembly for endoscopic surgery, including needle part and liquid storage handle, needle part and liquid storage handle are detachably connected, liquid storage cavity is equipped in liquid storage handle, can accommodate multiple kinds of medicaments, the automatic injection of liquid medicine is realized by the pre-compressed piston with injection spring, replace traditional manual injection mode, injection speed is stable, can realize the accurate, quantitative injection of liquid medicine in endoscopic surgery;In addition, the plug pipe is provided on the outside of side-port needle, the plug pipe is as the self-sealing structure of side-port needle liquid outlet side port, plug pipe is retracted under pressure during injection, expose liquid outlet side port, pull out side-port needle after injection, plug pipe is retracted again and covers and seals side port, realize double sealing before and after injection, fundamentally solve the problem of liquid leakage, avoid drug waste and surgical field pollution, improve the safety of surgical operation.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, and in particular relates to an automatic injector with a side-entry needle for laparoscopic surgery and an injection assembly. Background Technology

[0002] Laparoscopic surgery, with its advantages of minimal trauma, rapid postoperative recovery, and clear intraoperative visualization, has become a common surgical procedure in various clinical surgeries. During the procedure, it is often necessary to precisely inject various liquid medications, such as saline, hemostatic agents, and anesthetics, into the target tissue to achieve tissue separation, hemostasis, and local anesthesia. Currently, the liquid injection devices used in laparoscopic surgery are mostly traditional manual syringes, requiring medical staff to manually push the medication. Due to the limited operating space and instrument travel in laparoscopic surgery, uneven force application is prone to occur, making it difficult to achieve precise and quantitative injection of medication and increasing the difficulty of the intraoperative procedure. Furthermore, traditional injection devices lack a reliable self-sealing structure, making leakage of medication before and after injection easy. This results in drug waste, potential contamination of the surgical field, interference with surgical procedures, and even tissue irritation caused by leakage.

[0003] While some existing automated injection devices can achieve automatic injection, their complex structure and large size make them unsuitable for the minimally invasive requirements of laparoscopic surgery. Furthermore, most lack an immediate sealing structure after injection, failing to fundamentally solve the problem of drug leakage. In addition, the reservoir and injection components of these devices are often integrated, making disassembly and replacement inconvenient and unable to meet the clinical need for rapid switching between different medications in laparoscopic surgery. Therefore, there is an urgent need to develop a compact liquid injection device suitable for laparoscopic surgical scenarios, capable of automatic quantitative injection and possessing a self-sealing leak-proof function to overcome the aforementioned shortcomings of existing technologies. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a side-entry needle auto-injector and injection assembly for laparoscopic surgery.

[0005] The technical solution adopted in this invention is: an automatic injector with a side-entry needle for laparoscopic surgery, comprising,

[0006] The needle head consists of a needle holder, a side-port needle, and a self-sealing structure. The self-sealing structure is located at the connection between the side-port needle and the needle holder, and it can cover the side port of the side-port needle.

[0007] The liquid reservoir handle has a liquid reservoir at one end for storing liquid medicine, and a solid handle at the other end. The liquid reservoir contains an injection spring and a piston that are connected to each other. The end of the liquid reservoir handle containing the liquid reservoir can be threaded to the needle head.

[0008] Preferably, the self-sealing structure includes a plugging tube and a reset spring. The end of the needle holder is provided with a groove-shaped reset cavity. The side-port needle is inserted into the bottom of the reset cavity and connected to the needle holder, and communicates with the liquid channel in the needle holder.

[0009] One end of the blocking tube is embedded in the reset cavity and cannot be completely removed from the reset cavity; the reset spring is set in the reset cavity, with its two ends abutting against the blocking tube and the bottom of the reset cavity, respectively;

[0010] The side-entry needle passes through the plugging tube and the return spring; the plugging tube can fit tightly against the side-entry needle.

[0011] Preferably, the rear end of the plug tube has an outward annular protrusion forming a first limiting ring, and the end opening of the needle holder has an inward annular protrusion forming a second limiting ring, wherein the outer diameter of the first limiting ring is larger than the inner diameter of the second limiting ring.

[0012] Preferably, the needle holder is provided with a protruding push tube at one end of the liquid storage handle, the push tube can extend into the liquid storage handle and the push tube is connected to the liquid channel.

[0013] Preferably, a check valve is provided at the end of the liquid storage chamber, and the push tube can be inserted into the check valve to connect to the liquid storage chamber.

[0014] Preferably, the middle part of the needle holder is in a straight, bent, or curved shape.

[0015] Preferably, the outer wall of the liquid storage chamber is transparent, and the outer wall of the liquid storage chamber is provided with graduations.

[0016] Preferably, the piston edge is in contact with the inner wall of the liquid storage chamber, one end of the injection spring abuts against the bottom of the liquid storage chamber, and the other end of the injection spring is connected to the piston.

[0017] An injection assembly for laparoscopic surgery includes a side-entry needle autoinjector.

[0018] Preferably, it also includes a drug transfer syringe for injecting the drug into the reservoir.

[0019] The advantages and positive effects of this invention are: the automatic injector realizes the automatic injection of liquid medicine through a pre-compressed piston with an injection spring, replacing the traditional manual injection method, which can realize the precise and quantitative injection of liquid medicine in laparoscopic surgery, effectively reducing the difficulty of intraoperative operation for medical staff and improving injection accuracy and surgical efficiency.

[0020] The side opening self-sealing structure, consisting of a plugging tube and a reset spring, automatically retracts to expose the side opening during injection due to tissue resistance. After injection, it automatically resets and seals the side opening, achieving double sealing before and after injection. This fundamentally solves the problem of drug leakage, avoids drug waste and surgical field contamination, and improves the safety of surgical procedures.

[0021] The reservoir handle and needle head are detachably and sealed, making disassembly and assembly convenient and sealing reliable. This not only facilitates rapid preoperative filling of medication and postoperative cleaning and disinfection, but also allows for quick replacement of the reservoir chamber to switch between different liquid medications according to surgical needs, thus adapting to the clinical operation requirements of laparoscopic surgery.

[0022] The automatic injector has a compact overall structure, high integration of its components, and small size, making it suitable for the confined operating space and minimally invasive requirements of laparoscopic surgery. The solid handle design conforms to the gripping habits of laparoscopic surgery, making it easier for medical staff to cooperate with laparoscopic instruments to complete intraoperative operations, and it is highly practical. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional structural diagram of an embodiment of the present invention;

[0025] In the diagram: 1. Side-entry needle, 2. Plug tube, 3. Return spring, 4. Needle holder, 5. Liquid channel, 6. Check valve, 7. Liquid reservoir, 8. Injection spring, 9. Solid handle. Detailed Implementation

[0026] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0027] This invention relates to an automatic injector with a side-entry needle for laparoscopic surgery and its injection assembly, suitable for scenarios involving the automatic injection of various liquid medications during laparoscopic surgery. It addresses the technical problems of existing laparoscopic surgical injection devices, such as the difficulty of manual injection, low injection accuracy, easy leakage before and after injection, complex structure, and poor adaptability. The automatic injector achieves automatic and precise injection of medications, while also possessing an immediate self-sealing function to prevent leakage after injection. Furthermore, it features a compact structure and convenient assembly and disassembly, adapting to the confined operating space and minimally invasive procedures required in laparoscopic surgery. The automatic injector includes a needle head and a reservoir handle, which are detachably connected. The reservoir handle contains a reservoir cavity capable of holding various medications, such as saline, hemostatic agents, and anesthetics. The medication in the reservoir cavity can be injected into the target location through the needle head.

[0028] The needle head includes a needle holder, a side-port needle, and a self-sealing structure. The self-sealing structure includes a plugging tube and a return spring. The end of the needle holder has a groove-shaped return cavity. One end of the side-port needle is inserted into the needle holder at the bottom of the return cavity and communicates with the liquid channel in the needle holder. A plugging tube is sleeved on the outside of the side-port needle and inserted into the return cavity. A return spring is provided in the return cavity, with one end of the return spring abutting against the plugging tube and the other end abutting against the bottom of the return cavity. The rear end of the plugging tube has an outward annular protrusion forming a first limiting ring, and the end opening of the needle holder has an inward annular protrusion forming a second limiting ring. The outer diameter of the first limiting ring is larger than the inner diameter of the second limiting ring, so that the end of the plugging tube remains embedded in the return cavity and will not detach. Under the action of the return spring, the plugging tube is kept abutting against the needle holder and extending outward. The side-port needle passes through the plugging tube, the reset spring, and the reset chamber. When the first limiting ring and the second limiting ring abut, the plugging tube covers the side port of the side-port needle. The plugging tube tightly wraps around the side-port needle. When the plugging tube covers the side port of the side-port needle, it can prevent the medicine from flowing out. When the plugging tube is compressed into the reset chamber by external force and the side port of the side-port needle is exposed, the medicine can flow out from the side port.

[0029] In its natural state, when the auto-injector is filled with medication, the side opening of the needle is covered by a plug tube, thus sealing the needle. When the needle contacts muscle tissue, the pressure from the muscle tissue pushes the plug tube backward, exposing the side opening of the needle, thus completing the injection process. When the needle is withdrawn after injection, the pressure from the muscle tissue is lost, and the plug tube moves outward under the action of a return spring, re-covering the side opening of the needle, thus resealing the needle.

[0030] The needle holder has a threaded structure at the end away from the side-port needle, and a matching thread on the outer side of the reservoir handle. The needle head can be detachably connected to the reservoir handle via the threaded structure. To facilitate operation or meet the needs of different injection positions, the middle part of the needle holder can be made into a straight, bent, or curved shape. A liquid channel for drug flow is formed on the inner side of the needle holder, and the end of the liquid channel is connected to the side-port needle.

[0031] The reservoir handle is a slender cylindrical shape, with a reservoir at one end for storing the liquid medication, and a solid handle at the other end. The reservoir is cylindrical and integrally formed with the solid handle. During use, the operator can hold the handle and / or the outer wall of the reservoir to test the injection process. Inside the reservoir are an interconnected injection spring and piston. One end of the injection spring abuts against the bottom of the reservoir, and the other end connects to the piston. The piston edge fits against the inner wall of the reservoir, and the space formed between the piston tip and the reservoir outlet is used to hold the medication. The pre-compression force of the injection spring drives the piston to move axially along the reservoir, thus injecting the liquid medication into the reservoir.

[0032] A check valve is installed at the end opening of the reservoir to prevent the outflow of medication. During use, medication is injected into the reservoir through the check valve using a separate syringe. The injection spring retracts under the pressure of the injected medication, achieving a reserve of thrust. The check valve also unidirectionally seals the reservoir outlet, preventing leakage of the injected medication. A protruding push tube is also provided at the end of the needle holder connected to the infusion handle, extending into the reservoir handle. When the needle head is connected to the reservoir handle, the push tube inserts into the check valve to connect to the reservoir. The push tube connects to the liquid channel of the needle holder. When the needle head is properly connected to the reservoir handle, the reservoir, push tube, liquid channel, and side-port needle form a pathway. The plugging tube on the outside of the side-port needle provides resistance, and the injection spring in the reservoir provides reserve thrust. By properly controlling the length of the reservoir and the type of injection spring, the reserve thrust is made less than the resistance force, ensuring stable medication storage by the automatic injector under natural conditions. When no medication is loaded, the piston end face contacts the check valve. The check valve is a Luer-type check valve. In some embodiments of the present invention, one or more vent holes are provided in the area at the bottom of the reservoir covered by the injection spring.

[0033] The reservoir handle is designed as a slender column, which not only makes full use of the handle space and reduces the overall size of the auto-injector, but also allows for better control of the injection process by extending the length of the reservoir cavity and fully utilizing the injection spring. In some embodiments of this invention, the auto-injector can be used to inject 1-5 ml of medication. For ease of measurement, the outer wall of the reservoir cavity is transparent and has graduations, which can be used to measure the amount of medication injected. To facilitate the injection of medication into the reservoir cavity, a drug transfer syringe can be used. The drug transfer syringe can be a conventional syringe or a specific drug transfer syringe, with a needle head structure that is the same as or similar to the push tube structure.

[0034] During preparation, firstly, inject a preset amount of medication into the reservoir using the drug transfer syringe. The injection spring compresses as the medication is injected, storing thrust. The injected medication remains in the reservoir due to the check valve, preventing leakage. After the medication is injected, connect the needle head to the reservoir handle, and insert the push tube into the check valve to connect the reservoir. The medication fills the side needle under the thrust of the injection spring and remains in the auto-injector due to the blocking tube. The small amount of air originally in the auto-injector is vented by manually pushing the blocking tube. When in use, insert the tube into the target location. The plugging tube retracts under the action of the muscle, and the side-entry needle is inserted into the tissue at the target location. Under the thrust of the injection spring, the medication is injected into the target location. The side-entry needle can be withdrawn after all the medication in the reservoir has been injected, or it can be withdrawn after part of the medication has been injected. After the side-entry needle is withdrawn, the plugging tube loses the pressure of the muscle tissue and springs back to cover the side-entry needle again, sealing the medication outlet and preventing leakage.

[0035] This autoinjector is used in laparoscopic surgery in a sterile environment. The autoinjector or its assembly can be designed as a single-use or reusable device, pre-sterilized and packaged for use during surgery. Depending on the need, a single dose can be injected into the reservoir. After all the medication has been injected, the side-entry needle is withdrawn. Alternatively, it can be designed for multiple doses, with the injection volume controlled by the markings on the reservoir. After withdrawing the side-entry needle, it is sealed with an elastic sleeve. For reuse, the needle is reinserted for a second, appropriate dose. Alternatively, the medication can be replaced intraoperatively. Under sterile conditions, the needle head and reservoir handle are disassembled, medication is injected into the reservoir using a drug transfer syringe, and then the needle head is reconnected to the reservoir handle, following the aforementioned steps.

[0036] This autoinjector uses a pre-compressed piston with an injection spring to automatically inject medication, replacing the traditional manual injection method. It enables precise and quantitative injection of liquid drugs in laparoscopic surgery. The slender reservoir increases the working space of the injection spring and facilitates control of the injection volume. The autoinjector uses the injection spring design to set the active thrust required for the injection process as a passive thrust. The outflow and retention of the medication are controlled by the plug on the outside of the side needle, which greatly simplifies the structure of the autoinjector.

[0037] The present invention will now be described with reference to the accompanying drawings. Experimental methods not specifically described in terms of operation steps are performed in accordance with the corresponding product manuals. Unless otherwise specified, the instruments, reagents, and consumables used in the embodiments can be purchased from commercial companies.

[0038] Example:

[0039] 1. Structure of an auto-injector for laparoscopic surgery

[0040] The auto-injector includes a detachably connected needle head and a reservoir handle. The needle head consists of a needle holder 4, a side-port needle 1, and a self-sealing structure. The self-sealing structure is located at the connection between the side-port needle 1 and the needle holder 4, and can cover the side port of the side-port needle 1. The self-sealing structure includes a plugging tube 2 and a return spring 3. The end of the needle holder 4 has a groove-shaped return cavity. The side-port needle 1 is inserted into the bottom of the return cavity and connected to the needle holder 4, and communicates with the liquid channel 5 in the needle holder 4. One end of the plugging tube 2 is embedded in the return cavity and cannot be completely removed from the return cavity. The rear end of the plugging tube 2 has an outward annular protrusion forming a first limiting ring, and the end opening of the needle holder 4 has an inward annular protrusion forming a second limiting ring. The outer diameter of the first limiting ring is larger than the inner diameter of the second limiting ring. The return spring 3 is located in the return cavity, with its two ends abutting against the plugging tube 2 and the bottom of the return cavity, respectively. The side-port needle 1 passes through the plugging tube 2 and the return spring 3. The plugging tube 2 can tightly fit the side-port needle 1. The needle holder 4 has a 120° bend in the middle. The reservoir handle has a reservoir cavity 7 at one end for storing medication, and a solid handle 9 at the other end. The end of the reservoir handle containing the reservoir cavity 7 can be threaded to the needle head. The outer wall of the reservoir cavity 7 is transparent and has graduations. Inside the reservoir cavity 7 are an interconnected injection spring 8 and a piston. The edge of the piston fits against the inner wall of the reservoir cavity 7. One end of the injection spring 8 abuts against the bottom of the reservoir cavity 7, and the other end is connected to the piston. A check valve 6 is located at the opening of the reservoir cavity 7. The end of the needle holder 4 connected to the reservoir handle has a protruding push tube that can extend into the reservoir handle area, connecting to the check valve 6 and the reservoir cavity 7. The push tube also connects to the liquid channel 5.

[0041] 2. Preoperative loading and preparation steps

[0042] The threaded connection between the head of the loosening needle and the reservoir handle is disassembled, and the liquid medications required for laparoscopic surgery (such as saline, hemostatic agents, anesthetics, etc.) are injected into the reservoir. The amount of medication is precisely controlled according to the needs of the surgery. At the same time, the liquid injection applies axial pressure to the front end of the piston, compressing the injection spring to the preset pre-compression state, thus completing the filling of the reservoir and the pre-storage of the elasticity.

[0043] Connect the reservoir handle filled with the medication to the needle head in a sealed manner, and check that there is no looseness or gaps in any connection parts to ensure the sealing performance. At this time, the elastic sleeve still tightly seals the liquid outlet of the side needle. Under the pre-pressure of the injection spring and the sealing effect of the elastic sleeve, the medication in the reservoir cavity does not leak and remains in an injection-ready state.

[0044] Connect the assembled automatic injector to the laparoscopic surgical instruments, adjust the angle and position of the injector according to the needs of the surgical procedure, and complete the preoperative preparation.

[0045] 3. Injection Procedures in Laparoscopic Surgery

[0046] Guided by the laparoscopic equipment, medical staff hold the solid handle and push the liquid outlet of the side-hole needle toward the target tissue. The tip of the side-hole needle first pierces the tissue, the plugging tube retracts under force, compresses the reset spring, and exposes the side opening of the side-hole needle.

[0047] As the side opening is exposed, the injection spring is in a pre-compressed state without external force constraint. The injection spring begins to release its elastic force, driving the plug to move along the axial direction of the liquid storage cavity towards the side opening needle.

[0048] The piston, under the action of elastic force, pushes the liquid drug in the reservoir cavity, causing the drug to flow along the reservoir cavity towards the side needle. It passes through the liquid outlet of the reservoir cavity, the liquid channel, and the inside of the side needle in sequence, and finally is accurately injected into the target tissue of the human body from the side opening of the side needle, realizing automatic injection. Due to the release of the elastic force of the injection spring, the injection speed and force are stable, which can ensure the accuracy of injection volume and injection position.

[0049] When the spring force of the injection is fully released and the plug moves to the front limit position of the reservoir, the preset amount of drug in the reservoir is injected, completing the drug injection operation at that site during laparoscopic surgery.

[0050] 4. Post-injection sealing and post-operative care procedures

[0051] After the injection is completed, the medical staff holds the solid handle and pulls the side-opening needle out of the target tissue. The tissue resistance of the blocking tube disappears, and the elastic force of the reset spring pushes the blocking tube forward to reset, resealing the side opening of the side-opening needle. This effectively prevents the leakage of residual drug in the reservoir, avoiding contamination of the surgical field and waste of medication.

[0052] If medication needs to be injected into other areas or different types of liquid medication needs to be changed during laparoscopic surgery, the needle head and reservoir handle can be directly disassembled. The reservoir handle that has been used for injection can be removed, and a new reservoir handle filled with the corresponding medication can be replaced. After screwing it on and tightening, the injection operation can be performed again. The disassembly and assembly are convenient and meet the rapid operation requirements of laparoscopic surgery.

[0053] After the entire laparoscopic surgery is completed, all parts of this automatic injector are completely disassembled, cleaned, and disinfected. They can be reused (except for the single-use version) to complete the overall postoperative care.

[0054] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A side-entry needle auto-injector for laparoscopic surgery, characterized in that: include, The needle head consists of a needle head holder, a side-port needle, and a self-sealing structure. The self-sealing structure is located at the connection between the side-port needle and the needle head holder, and the self-sealing structure can cover the side port of the side-port needle. The liquid storage handle has a liquid storage cavity at one end for storing liquid medicine, and a solid handle at the other end. The liquid storage cavity contains an injection spring and a piston that are connected to each other. The end of the liquid storage handle containing the liquid storage cavity can be threadedly connected to the needle head.

2. The side-entry needle auto-injector for laparoscopic surgery according to claim 1, characterized in that: The self-sealing structure includes a plugging tube and a reset spring. The end of the needle holder is provided with a groove-shaped reset cavity. The side-port needle is inserted into the bottom of the reset cavity and connected to the needle holder, and communicates with the liquid channel in the needle holder. One end of the blocking tube is embedded in the reset cavity and cannot be completely removed from the reset cavity; the reset spring is disposed in the reset cavity, with its two ends abutting against the blocking tube and the bottom of the reset cavity, respectively; The side-entry needle passes through the plugging tube and the return spring; the plugging tube can fit tightly against the side-entry needle.

3. The side-entry needle auto-injector for laparoscopic surgery according to claim 2, characterized in that: The end of the plug tube has an outward annular protrusion forming a first limiting ring, and the end opening of the needle holder has an inward annular protrusion forming a second limiting ring. The outer diameter of the first limiting ring is larger than the inner diameter of the second limiting ring.

4. The side-entry needle auto-injector for laparoscopic surgery according to claim 2 or 3, characterized in that: The needle holder is connected to the liquid storage handle at one end and has a protruding push tube. The push tube can extend into the liquid storage handle and is connected to the liquid channel.

5. The side-entry needle auto-injector for laparoscopic surgery according to claim 4, characterized in that: The end of the liquid storage chamber is provided with a check valve, and the push tube can be inserted into the check valve to connect to the liquid storage chamber.

6. The side-entry needle auto-injector for laparoscopic surgery according to any one of claims 5, characterized in that: The needle holder has a straight, bent, or curved shape in the middle.

7. The side-entry needle auto-injector for laparoscopic surgery according to claim 5, characterized in that: The outer wall of the liquid storage chamber is transparent, and the outer wall of the liquid storage chamber is marked with graduations.

8. The side-entry needle auto-injector for laparoscopic surgery according to claim 5, characterized in that: The piston edge is in contact with the inner wall of the liquid storage chamber, one end of the injection spring abuts against the bottom of the liquid storage chamber, and the other end of the injection spring is connected to the piston.

9. An injection assembly for laparoscopic surgery, characterized in that: Includes the side-mouth needle auto-injector as described in any one of claims 1-8.

10. The injection assembly for laparoscopic surgery according to claim 9, characterized in that: It also includes a drug transfer syringe for injecting the drug into the reservoir.

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