An automatic injector and injection assembly for endoscopic surgery

Abstract

The present application relates to a kind of automatic injector and injection assembly for endoscopic surgery, including needle head and liquid storage handle, needle head 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 drug liquid is realized by pre-compressed spring-loaded piston, replace traditional manual injection mode, injection speed is stable, can realize the accurate, quantitative injection of liquid drug in endoscopic surgery;In addition, elastic rubber sleeve is provided on the outside of needle head, and the elastic rubber sleeve is used as the self-sealing structure of needle head outlet, the elastic rubber sleeve is pierced and deformed to expose the outlet during injection, and the outlet is automatically restored and sealed after injection is completed, to realize double sealing before and after injection, fundamentally solve the problem of drug 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 and injection assembly for laparoscopic surgery. 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, the present invention provides an auto-injector and injection assembly for laparoscopic surgery.

[0005] The technical solution adopted in this invention is: an automatic injector for laparoscopic surgery, comprising,

[0006] The needle tip has an elastic rubber sleeve wrapped around the outer side of the front needle tip.

[0007] The liquid storage handle has a liquid storage cavity at one end for storing the medicine, and a solid handle at the other end. The liquid storage cavity contains a 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.

[0008] Preferably, the needle head includes a needle holder, a needle, and an elastic sleeve. One end of the needle is inserted into the needle holder and communicates with the liquid channel in the needle holder.

[0009] 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.

[0010] 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.

[0011] Preferably, the needle tip can contact or have a gap with the inner wall of the elastic sleeve, and the end of the elastic sleeve abuts against the needle fixing seat; the elastic sleeve can be punctured by the needle to expose the needle tip; the needle can be wrapped again by the punctured elastic sleeve.

[0012] Preferably, the middle part of the needle holder is straight, bent, or curved.

[0013] Preferably, the outer wall of the liquid storage chamber is transparent, and the outer wall of the liquid storage chamber is provided with graduations.

[0014] Preferably, the piston edge is in contact with the inner wall of the liquid storage chamber, one end of the spring abuts against the bottom of the liquid storage chamber, and the other end of the spring is connected to the piston.

[0015] An injection assembly for laparoscopic surgery includes an autoinjector.

[0016] Preferably, it also includes a drug transfer syringe for injecting the drug into the reservoir.

[0017] The advantages and positive effects of this invention are: the automatic injector realizes the automatic injection of liquid medicine through a pre-compressed spring piston, 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.

[0018] The elastic sleeve serves as a self-sealing structure for the needle outlet. During injection, the elastic sleeve is punctured and deformed to expose the outlet. After injection, it automatically returns to its original shape and seals the outlet, achieving a double seal 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.

[0019] 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.

[0020] 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

[0021] Figure 1 This is a schematic diagram of an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional structural diagram of an embodiment of the present invention;

[0023] In the diagram: 1. Elastic rubber sleeve, 2. Needle, 3. Liquid channel, 4. Needle holder, 5. Threaded connection, 6. Check valve, 7. Liquid reservoir, 8. Spring, 9. Solid handle. Detailed Implementation

[0024] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0025] This invention relates to an autoinjector and injection assembly for laparoscopic surgery, suitable for scenarios involving the automatic injection of various liquid medications during laparoscopic procedures. 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 autoinjector achieves automatic and precise injection of medications, while also featuring an immediate self-sealing function to prevent leakage after injection. Furthermore, it has a compact structure, is easy to assemble and disassemble, and is suitable for the confined operating space and minimally invasive procedures required in laparoscopic surgery. The autoinjector includes a needle head and a reservoir handle, which are detachably connected. The reservoir handle contains a reservoir chamber capable of holding various medications, such as saline, hemostatic agents, and anesthetics. The medication in the reservoir chamber can be injected to the target location through the needle head.

[0026] The needle head includes a needle holder, a needle, and an elastic rubber sleeve. One end of the needle is inserted into the needle holder and communicates with the liquid channel in the needle holder; the outer side of the needle is covered with an elastic rubber sleeve. The elastic rubber sleeve is made of medical-grade elastic rubber material, which has good elastic recovery and sealing performance. It can undergo elastic deformation after being punctured by the needle and quickly return to its initial shape after the external force is removed, thus achieving reliable sealing of the needle outlet.

[0027] The elastic sleeve is tightly fitted onto the needle, ensuring a sealed internal space. The cylindrical elastic sleeve can be designed with a diameter equal to or slightly smaller than the needle diameter, maintaining a tight seal between the sleeve and the outer wall of the needle. In its natural state, the needle tip can contact the inner wall of the elastic sleeve or have a gap; preferably, there is a 1-2mm gap between the needle tip and the elastic sleeve. The end of the elastic sleeve abuts against the needle holder, aiding in its rebound. When the needle contacts muscle tissue, the pressure from the muscle tissue causes the needle tip to pierce the elastic sleeve, injecting the medication into the target location. After injection, the needle is withdrawn, and the elastic sleeve returns to its original shape, re-encasing the needle tip. Due to its deformable material properties, it re-seals the needle.

[0028] The needle holder has a threaded structure at the end away from the needle, and a matching thread is provided on the outer side of the end of the reservoir handle. The needle head can be detachably connected to the reservoir handle through 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 that can accommodate the flow of drugs is formed on the inner side of the needle holder, and the end of the liquid channel is connected to the needle.

[0029] 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, a spring and piston are interconnected. One end of the spring abuts against the bottom of the reservoir, and the other end connects to the piston. The edge of the piston fits against the inner wall of the reservoir, and the space formed between the piston's front end and the reservoir outlet is used to hold the medication. The pre-compression force of the spring drives the piston to move axially along the reservoir, thus injecting the liquid medication into the reservoir.

[0030] 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 spring retracts under the pressure of the injected medication, creating 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 needle form a pathway. The elastic sleeve on the outside of the needle provides resistance, and the spring in the reservoir provides reserve thrust. By properly controlling the length of the reservoir and the spring type, 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 spring.

[0031] 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 spring. In some embodiments of this invention, the auto-injector can be used to inject 1-5 ml of medication. For easy 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.

[0032] During preparation, firstly, inject a preset amount of medication into the reservoir using the drug transfer syringe. The 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. The push tube is then inserted into the check valve, connecting the reservoir. The medication fills the needle head under the spring's thrust and remains inside the auto-injector due to the elastic sleeve's resistance. Any small amount of air originally inside the auto-injector can be expelled through the gap between the needle head and the deformed elastic sleeve under the spring's thrust. The elastic sleeve effectively expels small amounts of air, preventing medication from flowing out. When in use, insert the needle into the target location. The elastic sleeve is punctured by the muscle and retracts, allowing the needle to penetrate the tissue at the target location. Under the thrust of the spring, the medication is injected into the target location. The needle can be withdrawn after all the medication in the reservoir has been injected, or after only a portion of the medication has been injected. After the needle is withdrawn, the elastic sleeve, freed from the pressure of the muscle tissue, returns to its original shape and covers the needle again, sealing the medication outlet to prevent leakage.

[0033] 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; the needle is withdrawn after all the medication has been injected. Alternatively, it can be designed for multiple doses, with the injection volume controlled by markings on the reservoir. After withdrawing the needle, it is sealed with an elastic sleeve, allowing for reinsertion of the appropriate dose for subsequent uses. 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 the needle head is then reconnected to the reservoir handle, following the aforementioned steps.

[0034] This autoinjector uses a pre-compressed, spring-loaded piston to automatically inject medication, replacing the traditional manual injection method. It enables precise and quantitative injection of liquid drugs during laparoscopic surgery. The slender reservoir increases the working space of the spring and facilitates control of the injected amount. The autoinjector uses a spring design to turn the active thrust required for the injection process into a passive thrust. The flow and retention of the medication are controlled by an elastic sleeve on the outside of the needle, which greatly simplifies the structure of the autoinjector.

[0035] 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.

[0036] Example:

[0037] 1. Structure of an auto-injector for laparoscopic surgery

[0038] The autoinjector includes a detachably connected needle head and a reservoir handle. The needle head includes a needle holder 4, a needle 2, and an elastic sleeve 1. One end of the needle 2 is inserted into the needle holder 4 and communicates with the liquid channel 3 in the needle holder 4. The elastic sleeve 1 covers the outside of the needle 2, and there is a 1mm gap between the end of the needle 2 and the inner wall of the elastic sleeve 1. The needle holder 4 is bent at 120° 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 connected to the threaded connection port 5 of the needle head. The outer wall of the reservoir cavity 7 is transparent and has graduations. The liquid storage chamber 7 is equipped with a spring 8 and a piston connected to each other. The edge of the piston is in contact with the inner wall of the liquid storage chamber 7. One end of the spring 8 abuts against the bottom of the liquid storage chamber 7, and the other end of the spring 8 is connected to the piston. A check valve 6 is provided at the end opening of the liquid storage chamber 7. The needle fixing seat 4 is connected to the liquid storage handle and has a protruding push tube at one end. The push tube can extend into the range of the liquid storage handle, and when inserted into the check valve 6, it connects to the liquid storage chamber 7. The push tube connects to the liquid channel 3.

[0039] 2. Preoperative loading and preparation steps

[0040] The threaded connection between the head of the loosening needle and the reservoir handle is disassembled and separated. 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 injection of liquid applies axial pressure to the front end of the piston, causing the compression spring to be compressed to the preset pre-compression state, thus completing the filling of the reservoir and the pre-storage of the elasticity.

[0041] 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 outlet of the needle, and the medication in the reservoir cavity does not leak under the pre-pressure of the compression spring and the sealing effect of the elastic sleeve, and remains in a ready-to-inject state.

[0042] 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.

[0043] 3. Injection Procedures in Laparoscopic Surgery

[0044] Guided by the laparoscopic equipment, medical staff hold the solid handle and push the needle's outlet towards the target tissue. The needle tip first pierces the elastic sleeve, causing the elastic sleeve to deform elastically under the pushing and piercing force of the needle. The part that is in contact with the needle's outlet opens outward, exposing the needle's outlet.

[0045] As the elastic sleeve is punctured and the needle outlet is exposed, the tip of the needle pierces the target tissue. At this time, the pre-compressed state of the spring-loaded piston is unrestrained by external force, and the compression spring begins to release its elastic force, driving the plug to move along the axial direction of the reservoir towards the needle.

[0046] The piston, under the action of elastic force, pushes the liquid drug in the reservoir, causing the drug to flow from the reservoir towards the needle. It then passes through the outlet of the reservoir, the liquid channel, and the inside of the needle, and finally is accurately injected into the target tissue of the human body from the outlet of the needle, realizing automatic injection. Due to the release of the elastic force of the compression spring, the injection speed and force are stable, which can ensure the accuracy of the injection volume and injection position.

[0047] When the spring force 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.

[0048] 4. Post-injection sealing and post-operative care procedures

[0049] After the injection is completed, the medical staff holds the solid handle and withdraws the needle from the target tissue. The piercing and pushing force of the needle against the elastic sleeve disappears, and the elastic sleeve, relying on its good elastic recovery, quickly returns to its initial shape. Its inner wall once again fits tightly against the needle's outlet, achieving a tight seal at the needle's outlet, effectively preventing leakage of residual medication in the reservoir, avoiding contamination of the surgical field and waste of medication.

[0050] 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.

[0051] 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.

[0052] 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 within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. An automatic injector for laparoscopic surgery, characterized in that: include, The needle tip has an elastic rubber sleeve wrapped around the outer side of the front needle tip. 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 a 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. The needle head includes a needle holder, the needle, and the elastic rubber sleeve. One end of the needle is inserted into the needle holder and communicates with the liquid channel in the needle holder. 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. 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; The needle tip can contact or have a gap with the inner wall of the elastic sleeve, and the end of the elastic sleeve abuts against the needle fixing seat; the elastic sleeve can be punctured by the needle to expose the needle tip; the needle can be wrapped again by the elastic sleeve after being punctured; the elastic sleeve can tightly seal the liquid outlet of the needle, and the liquid in the reservoir is kept in a state of no leakage and ready for injection under the pre-pressure of the compression spring and the sealing effect of the elastic sleeve.

2. The automatic injector for laparoscopic surgery according to claim 1, characterized in that: The needle holder has a straight, bent, or curved shape in the middle.

3. The automatic injector for laparoscopic surgery according to claim 1, 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.

4. The automatic injector for laparoscopic surgery according to claim 1, characterized in that: The piston edge is in contact with the inner wall of the liquid storage chamber, one end of the spring abuts against the bottom of the liquid storage chamber, and the other end of the spring is connected to the piston.

5. An injection assembly for laparoscopic surgery, characterized in that: Includes the autoinjector as described in any one of claims 1-4.

6. The injection assembly for laparoscopic surgery according to claim 5, characterized in that: It also includes a drug transfer syringe for injecting the drug into the reservoir.

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