An injection device

Abstract

The present invention discloses an injection device, which relates to the technical field of medical devices. The injection device includes a syringe. A tightening and loosening mechanism is installed on the outer sleeve, and the plunger rod passes through the tightening and loosening mechanism and extends into the outer sleeve. The plunger rod can move relative to the outer sleeve to draw in or inject liquid medicine inward. The tightening and loosening mechanism is provided with an internal thread, and an external thread is provided on the circumferential surface of the plunger rod. The tightening and loosening mechanism can be pressed against the outside of the plunger rod to engage the internal thread with the external thread. The tightening and loosening mechanism can also loosen the plunger rod to disengage the internal thread from the external thread. Compared with the prior art, the injection device provided by the present invention can achieve rapid liquid suction when drawing in liquid medicine and can accurately control the injection volume when injecting liquid medicine due to the adoption of the tightening and loosening mechanism installed on the outer sleeve and the plunger rod that can be in threaded cooperation with the tightening and loosening mechanism, which is convenient and practical.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly, to an injection device. Background Art

[0002] Currently, when injecting a liquid medicine into a patient clinically, the injection volume of the liquid medicine is controlled by a medical staff manually pushing a plunger rod. However, since the pushing and pulling speed of the plunger rod is difficult to control, it is impossible to accurately control the injection volume of the liquid medicine, and the situation of excessive or insufficient injection volume of the liquid medicine often occurs, which affects the health of the patient.

[0003] In view of this, it is particularly important to design and manufacture an injection device that can accurately control the injection volume, especially in the production of medical devices. Summary of the Invention

[0004] The purpose of the present invention is to provide an injection device that can achieve rapid liquid suction when extracting the liquid medicine, and can also accurately control the injection volume when injecting the liquid medicine, which is convenient and practical.

[0005] The present invention is implemented by adopting the following technical solutions.

[0006] An injection device includes a syringe, the syringe includes an outer sleeve, a plunger rod and a tightening mechanism. The tightening mechanism is installed on the outer sleeve. The plunger rod passes through the tightening mechanism and extends into the outer sleeve. The plunger rod can move relative to the outer sleeve to draw in or inject the liquid medicine inward. The tightening mechanism is provided with an internal thread, and an external thread is provided on the circumferential surface of the plunger rod. The tightening mechanism can be pressed against the outside of the plunger rod to engage the internal thread with the external thread, and the tightening mechanism can also loosen the plunger rod to disengage the internal thread from the external thread.

[0007] Further, the tightening mechanism includes a screwing member and an elastic member. The screwing member is fixedly connected to the elastic member. The outer sleeve is in threaded cooperation with the elastic member. The internal thread is provided inside the elastic member. The screwing member can drive the elastic member to rotate relative to the outer sleeve to press or loosen the elastic member.

[0008] Further, the elastic member includes a first threaded portion, a connecting portion and a tightening portion. The first threaded portion is fixedly connected to the tightening portion through the connecting portion. The internal thread is provided inside the tightening portion. The first threaded portion is fixedly connected to the screwing member. One end of the outer sleeve is provided with a second threaded portion, and the second threaded portion is sleeved outside the first threaded portion and is in threaded cooperation with the first threaded portion.

[0009] Further, both the first threaded portion and the tightening portion are annular. The diameter of the first threaded portion is larger than that of the tightening portion. The connecting portion is in a flared shape. The large end of the connecting portion is fixedly connected to the first threaded portion, and the small end of the connecting portion is fixedly connected to the tightening portion.

[0010] Further, the elastic member is provided with a deformation groove, and a first side wall and a second side wall are oppositely arranged on the deformation groove. The outer sleeve can press or relax the elastic member to close or separate the first side wall and the second side wall.

[0011] Further, the tightening and loosening mechanism includes a support frame, a first connecting member and a second connecting member. The support frame is fixedly connected to one end of the outer sleeve. The first connecting member and the second connecting member are detachably connected and are both arranged inside the support frame. The first connecting member can approach or move away from the second connecting member. The first connecting member is provided with a third thread portion, and the second connecting member is provided with a fourth thread portion. The third thread portion and the fourth thread portion are combined to form an internal thread.

[0012] Further, the first connecting member is provided with a first buckle, and the second connecting member is provided with a second buckle. The first buckle is snap-connected with the second buckle.

[0013] Further, a trigger button is movably arranged on the support frame. The position of the trigger button corresponds to the position of the first buckle. The trigger button can drive the first buckle to disengage from the second buckle.

[0014] Further, the tightening and loosening mechanism further includes a compression spring, and the compression spring is clamped between the first connecting member and the second connecting member.

[0015] Further, the first connecting member is provided with a first accommodation groove, and the second connecting member is provided with a second accommodation groove. The position of the first accommodation groove corresponds to the position of the second accommodation groove. One end of the compression spring extends into the first accommodation groove, and the other end extends into the second accommodation groove.

[0016] Further, the plunger rod includes a rubber plug, a rod body and a rotating portion. One end of the rod body is embedded in the rubber plug and is fixedly connected to the rubber plug. The other end of the rod body is fixedly connected to the rotating portion. The external thread is arranged on the circumferential surface of the rod body.

[0017] Further, the injection device further includes an injection needle, and the injection needle is detachably connected to the end of the outer sleeve away from the tightening and loosening mechanism.

[0018] Further, the injection needle includes a Luer connector, a needle tip and an outer needle tube. The outer needle tube is detachably connected to the outer sleeve through the Luer connector. The needle tip is fixedly connected to the end of the outer needle tube away from the Luer connector.

[0019] Further, the needle tip is provided with an opening, and the opening is communicated with the outer needle tube.

[0020] Further, the injection needle further includes an inner needle core and a fixing seat. The inner needle core is fixedly connected to the fixing seat. The fixing seat is slidably arranged inside the outer needle tube and the Luer connector. The fixing seat can drive the inner needle core to extend or retract into the opening.

[0021] Further, the fixing base is provided with a first snap button, the Luer connector is provided with a second snap button, the outer needle tube is provided with a chute along its length direction, the first snap button extends out of the chute and can slide relative to the chute, and the first snap button is clamped with the second snap button.

[0022] Further, the injection needle further includes a spring, the spring is arranged inside the Luer connector and abuts against one end of the fixing base away from the inner needle core.

[0023] Further, the injection needle further includes a sealing ring, the fixing base is provided with a relief groove along its circumferential direction, the sealing ring is sleeved in the relief groove and abuts against the Luer connector.

[0024] Further, the number of the openings is multiple, the needle head is in the shape of a multi-prism, the needle head is provided with a plurality of prism faces, and each opening is arranged on one prism face.

[0025] Further, the needle head is provided with a groove, one end of the outer needle tube away from the Luer connector is provided with an opening, the groove is communicated with the opening, and they are combined to form a liquid outlet cavity.

[0026] The injection device provided by the present invention has the following beneficial effects:

[0027] For the injection device provided by the present invention, the tightening and loosening mechanism is installed on the outer sleeve, the plunger rod passes through the tightening and loosening mechanism and extends into the outer sleeve, the plunger rod can move relative to the outer sleeve to draw or inject the liquid medicine inwards, the tightening and loosening mechanism is provided with an internal thread, the outer circumferential surface of the plunger rod is provided with an external thread, the tightening and loosening mechanism can be pressed against the outside of the plunger rod to make the internal thread mesh with the external thread, and the tightening and loosening mechanism can also loosen the plunger rod to make the internal thread disengage from the external thread. Compared with the prior art, since the injection device provided by the present invention adopts the tightening and loosening mechanism installed on the outer sleeve and the plunger rod that can be in threaded cooperation with the tightening and loosening mechanism, it can achieve rapid liquid suction when drawing the liquid medicine, and can accurately control the injection volume when injecting the liquid medicine, which is convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of the injection device provided by the first embodiment of the present invention;

[0030] Figure 2 It is a schematic structural diagram of the syringe in the injection device provided by the first embodiment of the present invention;

[0031] Figure 3 is Figure 2 the structural schematic diagram of the tightening mechanism in

[0032] Figure 4 the structural schematic diagram of the injection needle in the injection device provided by the first embodiment of the present invention;

[0033] Figure 5 is Figure 4 the partial enlarged view of V in

[0034] Figure 6 is Figure 4 the structural schematic diagram of the inner needle core extending out of the needle tip in

[0035] Figure 7 is Figure 4 the structural schematic diagram of the fixed seat in

[0036] Figure 8 is Figure 4 the structural schematic diagram of the needle tip in

[0037] Figure 9 the structural schematic diagram of the syringe in the injection device provided by the second embodiment of the present invention;

[0038] Figure 10 is Figure 9 the exploded view of the tightening mechanism in

[0039] Figure 11 is Figure 9 the sectional view of the tightening mechanism in

[0040] Figure 12 the structural schematic diagram of the injection needle in the injection device provided by the third embodiment of the present invention;

[0041] Figure 13 the structural schematic diagram of the injection needle in the injection device provided by the fourth embodiment of the present invention.

[0042] Icons: 10 - injection device; 100 - syringe; 110 - outer sleeve; 111 - inlet / outlet; 112 - port; 120 - plunger rod; 121 - external thread; 122 - rubber stopper; 123 - rod body; 124 - rotating part; 130 - tightening mechanism; 131 - internal thread; 132 - screwing member; 133 - elastic member; 1331 - first thread part; 1332 - connecting part; 1333 - tightening part; 1334 - deformation groove; 1335 - first side wall; 1336 - second side wall; 141 - support frame; 142 - compression spring; 143 - first connecting member; 144 - second connecting member; 145 - third thread part; 146 - fourth thread part; 147 - first buckle; 148 - second buckle; 149 - trigger button; 151 - first accommodating groove; 152 - second accommodating groove; 200 - injection needle; 210 - Luer connector; 211 - second snap; 220 - needle tip; 221 - opening; 222 - facet; 223 - groove; 230 - outer needle tube; 232 - sliding groove; 233 - opening; 240 - inner needle core; 250 - fixing seat; 251 - through hole; 252 - first snap; 253 - relief groove; 260 - spring; 270 - sealing ring; 280 - liquid outlet cavity. Detailed implementation manners

[0043] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0045] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] The following will describe in detail some embodiments of the present invention with reference to the drawings. Without conflict, the features in the following embodiments can be combined with each other.

[0049] In recent years, the medical image-guided tumor in-situ ablation technology has played an important role in the field of minimally invasive treatment. Thermal ablation and chemical ablation are the two main methods of tumor in-situ ablation. Percutaneous ethanol injection (PEI) belongs to percutaneous chemical ablation interventional therapy. Its principle is that after injecting absolute ethanol into the tumor, it can quickly dehydrate the tumor cells and the endothelial cells of their blood vessels, and cause protein coagulation, resulting in the degeneration and necrosis of cancer cells. Compared with thermal ablation techniques such as microwave ablation and radiofrequency ablation, absolute ethanol ablation is particularly suitable for lesions located under the liver capsule, beside large blood vessels, bile ducts, gallbladder, adjacent to the diaphragmatic surface or visceral surface. For lesions in these locations, if thermal ablation is used and the thermal ablation area is not well controlled, it is very easy to damage the accessory tissues and cause serious complications. However, the injected absolute ethanol mainly diffuses inside the tumor due to the limitation of the tumor capsule and has little impact on the tumor accessory tissues.

[0050] However, there are also some problems in the operation of anhydrous alcohol ablation of tumors. For example, due to the large amount of interstitial connective tissue or intervals in the tumor, anhydrous alcohol cannot be evenly distributed in the tumor tissue after injection, resulting in poor tumor inactivation effect. The common practice to solve this problem clinically is to repeat the injection or move the needle back for injection, but this invisibly increases the chance of tumor implantation along the needle track. At the same time, the operation is complicated, traumatic to the patient, and takes a long time. In addition, the amount of alcohol injected during anhydrous alcohol ablation also needs to be precisely controlled. Too much injection can easily damage the accessory tissue, and too little injection will not achieve the expected effect.

[0051] First embodiment

[0052] Please refer to Figure 1 The embodiment of the present invention provides an injection device 10 for injecting liquid medicine into a patient. The injection device 10 can achieve rapid liquid aspiration when extracting liquid medicine, and can also accurately control the injection volume when injecting liquid medicine, which is convenient and practical.

[0053] The injection device 10 includes a syringe 100 and an injection needle 200. The syringe 100 and the injection needle 200 are detachably connected to facilitate installation and replacement of the injection needle 200. The syringe 100 is used to store liquid medicine, and the injection needle 200 is used to pierce the patient's skin. The syringe 100 can inject the liquid medicine stored therein into the patient's body through the injection needle 200 to achieve the liquid medicine injection function.

[0054] Please refer to Figure 2 and Figure 3 The syringe 100 includes an outer sleeve 110, a plunger rod 120 and a tension mechanism 130. The tension mechanism 130 is installed on the outer sleeve 110, and the plunger rod 120 passes through the tension mechanism 130 and extends into the outer sleeve 110. The plunger rod 120 can move relative to the outer sleeve 110 to extract or inject the liquid medicine inwardly. In the process of the plunger rod 120 gradually extending out of the outer sleeve 110, the external air pressure is greater than the air pressure in the outer sleeve 110, and the liquid medicine is sucked into the outer sleeve 110 under the action of the pressure difference, so as to realize the function of the outer sleeve 110 to extract the liquid medicine inwardly; in the process of the plunger rod 120 gradually extending into the outer sleeve 110, the air pressure in the outer sleeve 110 is greater than the external air pressure, and the liquid medicine is squeezed out of the outer sleeve 110 under the action of the pressure difference, so as to realize the function of the outer sleeve 110 to inject the liquid medicine outwardly.

[0055] It should be noted that the tightening and loosening mechanism 130 is provided with an internal thread 131, and an external thread 121 is provided on the circumferential surface of the plunger rod 120. The internal thread 131 meshes with the external thread 121. The tightening and loosening mechanism 130 can be pressed against the outside of the plunger rod 120 to make the internal thread 131 mesh with the external thread 121. At this time, the plunger rod 120 can only rotate relative to the tightening and loosening mechanism 130 and displace along the axial direction of the plunger rod 120 during the rotation to slide relative to the outer sleeve 110. In this case, the plunger rod 120 is driven to slide in the outer sleeve 110 by screwing the plunger rod 120 to slow down the sliding speed of the plunger rod 120, so as to achieve precise control of the sliding speed of the plunger rod 120, and further achieve precise control of the liquid medicine injection volume. The tightening and loosening mechanism 130 can also loosen the plunger rod 120 to make the internal thread 131 disengage from the external thread 121. At this time, the plunger rod 120 is separated from the tightening and loosening mechanism 130, and the plunger rod 120 can directly slide relative to the outer sleeve 110 under the action of external force pushing and pulling. In this case, the plunger rod 120 is driven to slide in the outer sleeve 110 by pulling the plunger rod 120 to increase the sliding speed of the plunger rod 120, so as to achieve rapid extraction of the liquid medicine.

[0056] In this embodiment, during the process of extracting the liquid medicine, first, the tightening and loosening mechanism 130 is loosened from the plunger rod 120 to make the internal thread 131 disengage from the external thread 121, and then the plunger rod 120 is directly pulled out of the outer sleeve 110 to quickly suck the liquid medicine into the outer sleeve 110, so as to achieve the function of rapid liquid suction; during the process of injecting the liquid medicine, first, the tightening and loosening mechanism 130 is pressed against the plunger rod 120 to make the internal thread 131 mesh with the external thread 121, and then the plunger rod 120 is screwed so that the plunger rod 120 translates into the outer sleeve 110 during the rotation relative to the tightening and loosening mechanism 130, thereby slowly injecting the liquid medicine outwards and achieving precise control of the injection volume.

[0057] It should be noted that the outer sleeve 110 is provided with an inlet / outlet 111 and a port 112 oppositely. The inlet / outlet 111 is communicated with the port 112. The tightening and loosening mechanism 130 is installed at the port 112. The injection needle 200 is detachably connected to one end of the outer sleeve 110 away from the tightening and loosening mechanism 130, that is, the injection needle 200 is detachably connected to the inlet / outlet 111. The plunger rod 120 can pass through the port 112 and is movable relative to the outer sleeve 110. The liquid medicine can enter the outer sleeve 110 through the inlet / outlet 111, and the liquid medicine can also be output from the outer sleeve 110 through the inlet / outlet 111.

[0058] The tightening and loosening mechanism 130 includes a screwing member 132 and an elastic member 133. The screwing member 132 is fixedly connected to the elastic member 133. In this embodiment, the screwing member 132 and the elastic member 133 are integrally formed to improve the connection strength. The outer sleeve 110 is in threaded cooperation with the elastic member 133. The internal thread 131 is provided inside the elastic member 133. The screwing member 132 can drive the elastic member 133 to rotate relative to the outer sleeve 110, so that the outer sleeve 110 presses the elastic member 133 tightly or relaxes it, thereby enabling the elastic member 133 to press against or disengage from the plunger rod 120, and further enabling the internal thread 131 to engage or disengage from the external thread 121.

[0059] Specifically, when the outer sleeve 110 presses the elastic member 133 tightly, the elastic member 133 deforms and contracts inward under the pressure of the outer sleeve 110 against its own elastic force. At this time, the elastic member 133 presses against the outside of the plunger rod 120, and the internal thread 131 inside the elastic member 133 engages with the external thread 121 on the circumferential surface of the plunger rod 120; when the outer sleeve 110 relaxes the elastic member 133, the elastic member 133 rebounds and expands outward under the action of its own elastic force. At this time, the elastic member 133 disengages from the plunger rod 120, and the internal thread 131 inside the elastic member 133 disengages from the external thread 121 on the circumferential surface of the plunger rod 120.

[0060] The elastic member 133 includes a first threaded portion 1331, a connecting portion 1332, and a tightening and loosening portion 1333. The first threaded portion 1331 is fixedly connected to the tightening and loosening portion 1333 through the connecting portion 1332. In this embodiment, the first threaded portion 1331, the connecting portion 1332, and the tightening and loosening portion 1333 are integrally formed to improve the connection strength. The first threaded portion 1331 is fixedly connected to the screwing member 132, and the screwing member 132 can drive the entire elastic member 133 to rotate through the first threaded portion 1331. The internal thread 131 is provided inside the tightening and loosening portion 1333, and the tightening and loosening portion 1333 can be in threaded cooperation with the plunger rod 120. One end of the outer sleeve 110 is provided with a second threaded portion, and the second threaded portion is sleeved outside the first threaded portion 1331 and is in threaded cooperation with the first threaded portion 1331. During the rotation of the first threaded portion 1331 relative to the second threaded portion, the elastic member 133 extends into or retracts from the port 112 of the outer sleeve 110. During this process, the outer sleeve 110 squeezes the elastic member 133 or relaxes it, so that the elastic member 133 presses against or disengages from the plunger rod 120.

[0061] In this embodiment, both the first threaded portion 1331 and the tightening portion 1333 are annular. The diameter of the first threaded portion 1331 is greater than that of the tightening portion 1333. The connecting portion 1332 is flared. The large end of the connecting portion 1332 is fixedly connected to the first threaded portion 1331, and the small end of the connecting portion 1332 is fixedly connected to the tightening portion 1333. Specifically, the outer diameter of the first threaded portion 1331 is greater than the inner diameter of the outer sleeve 110, the inner diameter of the outer sleeve 110 is greater than the outer diameter of the tightening portion 1333, and the position of the connecting portion 1332 corresponds to the end face position of the outer sleeve 110. When the elastic member 133 extends into the port 112 of the outer sleeve 110, the end face of the outer sleeve 110 applies pressure to the connecting portion 1332, causing the connecting portion 1332 to contract inward, thereby driving the tightening portion 1333 to contract inward, and further enabling the internal thread 131 of the tightening portion 1333 to engage with the external thread 121 of the plunger rod 120.

[0062] Furthermore, the elastic member 133 is provided with a deformation groove 1334. Opposite the deformation groove 1334 are a first side wall 1335 and a second side wall 1336. The outer sleeve 110 can compress or relax the elastic member 133 to cause the first side wall 1335 and the second side wall 1336 to close or separate. Specifically, the deformation groove 1334 is a through groove, and the deformation groove 1334 is longitudinally provided on the first threaded portion 1331, the connecting portion 1332, and the tightening portion 1333. When the elastic member 133 extends into the port 112 of the outer sleeve 110, the end face of the outer sleeve 110 applies pressure to the elastic member 133 to overcome the elastic force of the elastic member 133, causing the first side wall 1335 and the second side wall 1336 to close, thereby enabling the internal thread 131 of the elastic member 133 to engage with the external thread 121 of the plunger rod 120; when the elastic member 133 retracts out of the port 112 of the outer sleeve 110, the end face of the outer sleeve 110 no longer applies pressure to the elastic member 133, and the elastic member 133 separates the first side wall 1335 and the second side wall 1336 under its own elastic force, thereby causing the internal thread 131 of the elastic member 133 to disengage from the external thread 121 of the plunger rod 120.

[0063] In this embodiment, the number of the deformation grooves 1334 is two. The two deformation grooves 1334 are oppositely arranged on both sides of the elastic member 133 to increase the deformation degree of the elastic member 133, facilitating the realization of the contraction and expansion functions of the elastic member 133. However, it is not limited thereto. In other embodiments, the number of the deformation grooves 1334 can be three or four, and no specific limitation is imposed on the number of the deformation grooves 1334.

[0064] It should be noted that the outer sleeve 110 is made of a transparent material, and a volume scale is provided on the surface of the outer sleeve 110 to facilitate observing the inhalation amount and injection amount of the liquid medicine, so as to achieve precise control of the injection amount. In this embodiment, the elastic member 133 is made of a rubber material to have good elasticity, but it is not limited thereto. In other embodiments, the elastic member 133 may be made of a plastic material, and the material of the elastic member 133 is not specifically limited.

[0065] The plunger rod 120 includes a rubber plug 122, a rod body 123, and a rotating portion 124. One end of the rod body 123 is embedded in the rubber plug 122 and fixedly connected to the rubber plug 122. The other end of the rod body 123 is fixedly connected to the rotating portion 124. An external thread 121 is provided on the circumferential surface of the rod body 123, and the rod body 123 can be in threaded cooperation with the elastic member 133. The rotating portion 124 can directly drive the rubber plug 122 to slide in the outer sleeve 110 through the rod body 123, and the rotating portion 124 can also drive the rubber plug 122 to rotate by driving the rod body 123 to rotate, so that the rubber plug 122 slides relative to the outer sleeve 110.

[0066] Please refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , the injection needle 200 includes a Luer connector 210, a needle tip 220, an outer needle tube 230, an inner needle core 240, a fixing seat 250, a spring 260, and a sealing ring 270. The outer needle tube 230 is detachably connected to the outer sleeve 110 through the Luer connector 210 to facilitate installation and replacement. The needle tip 220 is fixedly connected to one end of the outer needle tube 230 away from the Luer connector 210. The needle tip 220 is provided with an opening 221, and the opening 221 is communicated with the outer needle tube 230. The outer sleeve 110 is communicated with the opening 221 of the needle tip 220 through the Luer connector 210 and the outer needle tube 230. In this embodiment, the needle tip 220 is welded to the outer needle tube 230. Both the outer needle tube 230 and the inner needle core 240 are tubular structures. The outer needle tube 230 is made of a stainless steel material, and a depth scale is provided on the outer surface of the outer needle tube 230 to facilitate observing the penetration depth of the outer needle tube 230 into the body.

[0067] It should be noted that the inner needle core 240 is fixedly connected to the fixed seat 250. The fixed seat 250 is slidably arranged in the outer needle tube 230 and the Luer connector 210. The inner needle core 240 is arranged in the outer needle tube 230. The fixed seat 250 can drive the inner needle core 240 to slide relative to the outer needle tube 230, so that the inner needle core 240 extends out or retracts into the opening 221. Specifically, a through hole 251 is formed in the fixed seat 250. The inner needle core 240 is welded to the fixed seat 250 and communicates with the through hole 251. The liquid medicine in the outer sleeve 110 can sequentially enter the inner needle core 240 through the Luer connector 210 and the through hole 251 of the fixed seat 250, and is injected into the patient's body through the inner needle core 240.

[0068] It should be noted that the number of the openings 221, the inner needle cores 240 and the through holes 251 are all multiple. The needle head 220 is in the shape of a multi-prism. The needle head 220 is provided with a plurality of prism faces 222. Each opening 221 is formed on one prism face 222. The plurality of through holes 251 are arranged on the fixed seat 250 in parallel at intervals. Each through hole 251 communicates with one inner needle core 240. The position of each inner needle core 240 corresponds to the position of one opening 221. The plurality of inner needle cores 240 can move outwards simultaneously under the drive of the fixed seat 250 to extend out of the plurality of openings 221 on the needle head 220, so as to realize the multi-angle simultaneous injection function. In this embodiment, the number of the openings 221, the inner needle cores 240 and the through holes 251 are all three, but it is not limited thereto. In other embodiments, the number of the openings 221, the inner needle cores 240 and the through holes 251 can all be four, or can all be five. The number of the openings 221, the inner needle cores 240 and the through holes 251 is not specifically limited.

[0069] In this embodiment, the end of the inner needle core 240 far from the fixed seat 250 is naturally elastically bent. When the fixed seat 250 drives the inner needle core 240 to retract into the opening 221, the inner needle core 240 is straightened under the limiting action of the needle head 220 and the outer needle tube 230. When the fixed seat 250 drives the inner needle core 240 to extend out of the opening 221, the inner needle core 240 bends outwards under its own elastic action to penetrate deep into the patient's body and reach the lesion area far from the patient's skin. Specifically, the plurality of inner needle cores 240 can disperse around after extending out of the plurality of openings 221, so as to facilitate the uniform injection of the liquid medicine into the patient's body, that is, facilitate the uniform injection of absolute ethanol into the patient's body, so that the absolute ethanol is uniformly distributed in the tumor tissue after injection, realize multi-angle simultaneous injection, improve the inactivation effect on the tumor, reduce the number of repeated injections or mobile retraction needle injections, reduce the chance of tumor implantation along the needle track, simplify the surgical operation steps at the same time, relieve the patient's pain, reduce the patient's trauma and complications, and is practical and reliable.

[0070] In this embodiment, the fixing base 250 is provided with a first snap 252, and the Luer connector 210 is provided with a second snap 211. A sliding groove 232 is formed in the outer needle tube 230 along its length direction. The first snap 252 extends out of the sliding groove 232 and can slide relative to the sliding groove 232 to drive the fixing base 250 to slide relative to the outer needle tube 230, thereby driving the inner needle core 240 to extend out or retract into the opening 221. The first snap 252 is engaged with the second snap 211 to fix the relative positions of the fixing base 250 and the Luer connector 210. At this time, the inner needle core 240 is located inside the outer needle tube 230, and the second snap 211 can prevent the inner needle core 240 from extending out of the opening 221.

[0071] It should be noted that the spring 260 is arranged inside the Luer connector 210 and abuts against one end of the fixing base 250 away from the inner needle core 240. The spring 260 is always in a compressed state to apply an elastic force to the fixing base 250, so that the fixing base 250 has a tendency to move away from the Luer connector 210. When the first snap 252 is engaged with the second snap 211, the compression amount of the spring 260 is the largest. At this time, the second snap 211 applies a clamping force to the fixing base 250 through the first snap 252, and this clamping force balances the elastic force of the spring 260 to prevent the fixing base 250 from displacing relative to the Luer connector 210; when the first snap 252 is disengaged from the second snap 211, the elastic force of the spring 260 drives the fixing base 250 to move away from the Luer connector 210, so that the inner needle core 240 fixedly connected to the fixing base 250 extends out of the opening 221.

[0072] In this embodiment, a relief groove 253 is formed in the fixing base 250 along its circumferential direction. The sealing ring 270 is sleeved in the relief groove 253 and abuts against the Luer connector 210. The sealing ring 270 can seal the gap between the fixing base 250 and the Luer connector 210 to prevent the liquid medicine from flowing into the outer needle tube 230 through the gap between the fixing base 250 and the Luer connector 210. Specifically, the sealing ring 270 is made of silica gel material and has good elasticity.

[0073] When injecting a patient with a liquid medicine, first remove the injection needle 200 and install an ordinary needle on the outer sleeve 110; then loosen the screw member 132 outward so that the elastic member 133 moves away from the outer sleeve 110. At this time, the outer sleeve 110 does not apply pressure to the elastic member 133, and the internal thread 131 of the elastic member 133 disengages from the external thread 121 of the plunger rod 120; then directly pull the plunger rod 120 out of the outer sleeve 110 to quickly suck the liquid medicine into the outer sleeve 110 through the ordinary needle; then remove the ordinary needle and install the injection needle 200 on the outer sleeve 110; then, under the guidance of medical imaging, insert the injection needle 200 into the lesion to be injected; then release the locking state of the first snap 252 and the second snap 211, and the fixing seat 250 slides relative to the outer needle tube 230 under the elastic force of the spring 260, so that the inner needle core 240 extends out of the opening 221 of the needle tip 220. At this time, the plurality of inner needle cores 240 bend and spread out around, and are evenly scattered and inserted into the periphery of the tumor; then tighten the screw member 132 inward so that the elastic member 133 moves toward the outer sleeve 110. At this time, the outer sleeve 110 applies pressure to the elastic member 133, and the internal thread 131 of the elastic member 133 engages with the external thread 121 of the plunger rod 120; then rotate the plunger rod 120 so that the plunger rod 120 translates into the outer sleeve 110 during the rotation relative to the elastic member 133, thereby realizing the precise injection of the liquid medicine; then drive the fixing seat 250 through the first snap 252 to overcome the elastic force of the spring 260 and slide relative to the outer needle tube 230 until the first snap 252 engages with the second snap 211. At this time, the inner needle core 240 retracts into the outer needle tube 230; finally, pull out the injection needle 200 from the patient's body.

[0074] In the injection device 10 provided by the embodiment of the present invention, the tightening and loosening mechanism 130 is installed on the outer sleeve 110, the plunger rod 120 passes through the tightening and loosening mechanism 130 and extends into the outer sleeve 110. The plunger rod 120 can move relative to the outer sleeve 110 to suck or inject the liquid medicine inward. The tightening and loosening mechanism 130 is provided with an internal thread 131, and an external thread 121 is provided on the circumferential surface of the plunger rod 120. The tightening and loosening mechanism 130 can be pressed against the outside of the plunger rod 120 so that the internal thread 131 engages with the external thread 121. The tightening and loosening mechanism 130 can also loosen the plunger rod 120 so that the internal thread 131 disengages from the external thread 121. Compared with the prior art, since the injection device 10 provided by the present invention adopts the tightening and loosening mechanism 130 installed on the outer sleeve 110 and the plunger rod 120 that can be in threaded cooperation with the tightening and loosening mechanism 130, it can achieve rapid liquid suction when sucking the liquid medicine, and can also accurately control the injection volume when injecting the liquid medicine, which is convenient and practical.

[0075] Second Embodiment

[0076] Please refer to Figure 9 、 Figure 10 and Figure 11, embodiments of the present invention provide an injection device 10. Compared with the first embodiment, the difference in this embodiment lies in the different structure of the tightening mechanism 130.

[0077] In this embodiment, the tightening mechanism 130 no longer includes a screwing member 132 and an elastic member 133, but includes a support frame 141, a compression spring 142, a first connecting member 143, and a second connecting member 144. The support frame 141 is fixedly connected to one end of the outer sleeve 110, that is, the support frame 141 is fixedly connected to the port 112. The first connecting member 143 and the second connecting member 144 are detachably connected and are both disposed within the support frame 141. The support frame 141 can limit the first connecting member 143 and the second connecting member 144 to prevent the first connecting member 143 and the second connecting member 144 from detaching from the outer sleeve 110. The first connecting member 143 is provided with a third thread portion 145, and the second connecting member 144 is provided with a fourth thread portion 146. The third thread portion 145 and the fourth thread portion 146 combine to form an internal thread 131. The first connecting member 143 can move closer to or away from the second connecting member 144 so that the internal thread 131 is formed or separated, thereby causing the internal thread 131 to engage or disengage from the external thread 121 of the plunger rod 120.

[0078] In this embodiment, the first connecting member 143 is provided with a first buckle 147, and the second connecting member 144 is provided with a second buckle 148. The first buckle 147 and the second buckle 148 are snap-connected to achieve the detachable connection between the first connecting member 143 and the second connecting member 144. When the first buckle 147 and the second buckle 148 are in the snap-connected state, the first connecting member 143 and the second connecting member 144 are closed to form the internal thread 131, thereby realizing the engagement between the internal thread 131 and the external thread 121.

[0079] Specifically, a trigger button 149 is movably disposed on the support frame 141. The position of the trigger button 149 corresponds to the position of the first buckle 147. The trigger button 149 can drive the first buckle 147 to disengage from the second buckle 148 to release the snap-connected state between the first buckle 147 and the second buckle 148, thereby causing the first connecting member 143 and the second connecting member 144 to separate.

[0080] It should be noted that the compression spring 142 is clamped between the first connecting member 143 and the second connecting member 144, and the compression spring 142 is always in a compressed state to apply an elastic force to the first connecting member 143 and the second connecting member 144, so that the first connecting member 143 and the second connecting member 144 have a tendency to move away from each other. When the first buckle 147 is engaged with the second buckle 148, the compression amount of the compression spring 142 is the largest. At this time, the clamping force between the first buckle 147 and the second buckle 148 is balanced with the elastic force of the compression spring 142 to prevent relative displacement between the first connecting member 143 and the second connecting member 144, and the internal thread 131 formed by the combination of the third thread portion 145 and the fourth thread portion 146 meshes with the external thread 121 of the plunger rod 120; when the first buckle 147 is disengaged from the second buckle 148, the elastic force of the compression spring 142 drives the first connecting member 143 and the second connecting member to move away from each other, so that the internal thread 131 is divided into two halves. At this time, the third thread portion 145 and the fourth thread portion 146 are separated and both are disengaged from the external thread 121 of the plunger rod 120.

[0081] In this embodiment, the number of the compression springs 142 is four, and the four compression springs 142 are distributed in a rectangular array between the first connecting member 143 and the second connecting member 144, so that the first connecting member 143 and the second connecting member 144 are balanced in force, ensuring the stable and reliable movement process of the first connecting member 143 and the second connecting member 144 moving away from or approaching each other, and preventing the first connecting member 143 and the second connecting member 144 from shifting or flipping.

[0082] In this embodiment, the first connecting member 143 is provided with a first receiving groove 151, and the second connecting member 144 is provided with a second receiving groove 152. The position of the first receiving groove 151 corresponds to the position of the second receiving groove 152. One end of the compression spring 142 extends into the first receiving groove 151, and the other end extends into the second receiving groove 152. Both the first receiving groove 151 and the second receiving groove 152 are used to limit the compression spring 142 to limit the telescopic direction of the compression spring 142, thereby limiting the movement direction of the first connecting member 143 and the second connecting member moving away from or approaching each other.

[0083] During the process of extracting the liquid medicine, first press the trigger button 149 to release the locked state of the first buckle 147 and the second buckle 148. At this time, the first connecting member 143 and the second connecting member 144 move away from each other under the elastic force of the compression spring 142, and both the third threaded portion 145 and the fourth threaded portion 146 are disengaged from the external thread 121 of the plunger rod 120. Subsequently, directly pull the plunger rod 120 outward of the outer sleeve 110 to quickly suck the liquid medicine into the outer sleeve 110, thereby realizing the function of rapid liquid suction. During the process of injecting the liquid medicine, first press the first connecting member 143 and the second connecting member 144 simultaneously, so that the first connecting member 143 and the second connecting member 144 move closer to each other against the elastic force of the compression spring 142 until the first buckle 147 is locked with the second buckle 148. At this time, the third threaded portion 145 and the fourth threaded portion 146 are combined to form an internal thread 131 that meshes with the external thread 121. Subsequently, rotate the plunger rod 120, so that the plunger rod 120 translates into the outer sleeve 110 during the process of rotating relative to the support frame 141, thereby slowly injecting the liquid medicine outward and realizing precise control of the injection volume.

[0084] The beneficial effects of the injection device 10 provided in the embodiment of the present invention are the same as those of the first embodiment, and will not be elaborated here.

[0085] Third Embodiment

[0086] Please refer to Figure 12 , the embodiment of the present invention provides an injection device 10. Compared with the first embodiment, the difference in this embodiment lies in the different structure of the injection needle 200.

[0087] In this embodiment, the injection needle 200 no longer includes an inner needle core 240, a fixed seat 250, a spring 260, and a sealing ring 270, but only includes a Luer connector 210, a needle tip 220, and an outer needle tube 230. The outer needle tube 230 is detachably connected to the outer sleeve 110 through the Luer connector 210, which is convenient for installation and replacement. The needle tip 220 is fixedly connected to one end of the outer needle tube 230 away from the Luer connector 210. The needle tip 220 is provided with an opening 221, and the opening 221 communicates with the outer needle tube 230. The liquid medicine in the outer sleeve 110 can be output to the patient's body sequentially through the Luer connector 210, the outer needle tube 230, and the opening 221 on the needle tip 220.

[0088] It should be noted that the number of the openings 221 is multiple, the needle tip 220 is in the shape of a multihedron, and the needle tip 220 is provided with a plurality of prism faces 222, and each opening 221 is opened on one prism face 222. In this embodiment, the number of the openings 221 is three, but it is not limited thereto. In other embodiments, the number of the openings 221 can be four, or can be five, and the number of the openings 221 is not specifically limited.

[0089] Specifically, when injecting the liquid medicine into a patient, it directly sprays around through multiple openings 221 on the needle 220, and can also achieve simultaneous multi-angle injection, thus achieving a certain degree of uniform injection. This situation is especially applicable to some small tumors with a diameter of about one centimeter.

[0090] The beneficial effects of the injection device 10 provided in the embodiments of the present invention are the same as those of the first embodiment, and will not be elaborated here.

[0091] Fourth Embodiment

[0092] Please refer to Figure 13 , the embodiments of the present invention provide an injection device 10. Compared with the third embodiment, the difference in this embodiment lies in the different structures of the needle 220 and the outer needle tube 230.

[0093] In this embodiment, the needle 220 is no longer provided with openings 221, but a groove 223 is provided on the side of the needle 220, and an opening 233 is provided on the inner side wall of the outer needle tube 230. The opening 233 is arranged at one end of the outer needle tube 230 away from the Luer connector 210. The groove 223 communicates with the opening 233, and a liquid outlet cavity 280 is formed in combination for outputting the liquid medicine. The liquid medicine in the outer sleeve 110 can be output into the patient's body through the Luer connector 210, the outer needle tube 230, and the liquid outlet cavity 280 in sequence.

[0094] Specifically, when injecting the liquid medicine into a patient, it directly sprays around through the liquid outlet cavity 280 between the needle 220 and the outer needle tube 230, and can also achieve simultaneous multi-angle injection, thus achieving a certain degree of uniform injection.

[0095] The beneficial effects of the injection device 10 provided in the embodiments of the present invention are the same as those of the third embodiment, and will not be elaborated here.

[0096] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An injection device, characterized in that, Comprising a syringe, the syringe includes an outer sleeve, a plunger rod and a tightening mechanism. The tightening mechanism is installed on the outer sleeve. The plunger rod passes through the tightening mechanism and extends into the outer sleeve. The plunger rod can move relative to the outer sleeve to draw in or inject liquid medicine inward or outward. The tightening mechanism is provided with an internal thread, and an external thread is provided on the circumferential surface of the plunger rod. The tightening mechanism can be pressed against the outside of the plunger rod to engage the internal thread with the external thread. The tightening mechanism can also loosen the plunger rod to disengage the internal thread from the external thread; The tightening mechanism includes a screwing member and an elastic member. The screwing member is fixedly connected to the elastic member. The outer sleeve is in threaded cooperation with the elastic member. The internal thread is provided in the elastic member. The screwing member can drive the elastic member to rotate relative to the outer sleeve to press or loosen the elastic member by the outer sleeve; The elastic member includes a first threaded portion, a connecting portion and a tightening portion. The first threaded portion is fixedly connected to the tightening portion through the connecting portion. The internal thread is provided in the tightening portion. The first threaded portion is fixedly connected to the screwing member. A second threaded portion is provided at one end of the outer sleeve. The second threaded portion is sleeved outside the first threaded portion and is in threaded cooperation with the first threaded portion; The plunger rod includes a rubber plug, a rod body and a rotating portion. One end of the rod body is embedded in the rubber plug and is fixedly connected to the rubber plug. The other end of the rod body is fixedly connected to the rotating portion. The external thread is provided on the circumferential surface of the rod body.

2. The injection device according to claim 1, characterized in that, Both the first threaded portion and the tightening portion are annular. The diameter of the first threaded portion is larger than the diameter of the tightening portion. The connecting portion is in a flared shape. The large end of the connecting portion is fixedly connected to the first threaded portion, and the small end of the connecting portion is fixedly connected to the tightening portion.

3. The injection device according to claim 1, characterized in that, The elastic member is provided with a deformation groove. The deformation groove is provided with a first side wall and a second side wall opposite to each other. The outer sleeve can press or loosen the elastic member to close or separate the first side wall and the second side wall.

4. The injection device according to claim 1, characterized in that, The tightening mechanism includes a support frame, a first connecting member and a second connecting member. The support frame is fixedly connected to one end of the outer sleeve. The first connecting member and the second connecting member are detachably connected and are both arranged in the support frame. The first connecting member can approach or move away from the second connecting member. The first connecting member is provided with a third threaded portion, and the second connecting member is provided with a fourth threaded portion. The third threaded portion and the fourth threaded portion are combined to form the internal thread.

5. The injection device according to claim 4, characterized in that, The first connecting member is provided with a first buckle, and the second connecting member is provided with a second buckle. The first buckle is snap-connected to the second buckle.

6. The injection device according to claim 5, characterized in that, A trigger button is movably arranged on the support frame. The position of the trigger button corresponds to the position of the first buckle. The trigger button can drive the first buckle to disengage from the second buckle.

7. The injection device according to claim 4, characterized in that, The tightening mechanism further includes a compression spring. The compression spring is clamped between the first connecting member and the second connecting member.

8. The injection device according to claim 7, characterized in that, The first connecting member is provided with a first receiving groove, and the second connecting member is provided with a second receiving groove. The position of the first receiving groove corresponds to the position of the second receiving groove. One end of the compression spring extends into the first receiving groove, and the other end extends into the second receiving groove.

9. The injection device according to any one of claims 1 to 8, characterized in that, The injection device further includes an injection needle, and the injection needle is detachably connected to one end of the outer sleeve away from the tightening mechanism.

10. The injection device according to claim 9, characterized in that, The injection needle includes a Luer connector, a needle tip, and an outer needle tube. The outer needle tube is detachably connected to the outer sleeve through the Luer connector, and the needle tip is fixedly connected to one end of the outer needle tube away from the Luer connector.

11. The injection device according to claim 10, characterized in that, The needle tip is provided with an opening, and the opening communicates with the outer needle tube.

12. The injection device according to claim 11, characterized in that, The injection needle further includes an inner needle core and a fixing seat. The inner needle core is fixedly connected to the fixing seat, and the fixing seat is slidably disposed in the outer needle tube and the Luer connector. The fixing seat can drive the inner needle core to extend or retract into the opening.

13. The injection device according to claim 12, characterized in that, The fixing seat is provided with a first snap, the Luer connector is provided with a second snap, and the outer needle tube is provided with a sliding groove along its length direction. The first snap extends out of the sliding groove and can slide relative to the sliding groove, and the first snap is engaged with the second snap.

14. The injection device according to claim 12, characterized in that, The injection needle further includes a spring, and the spring is disposed in the Luer connector and abuts against one end of the fixing seat away from the inner needle core.

15. The injection device according to claim 12, characterized in that, The injection needle further includes a sealing ring. The fixing seat is provided with a relief groove along its circumferential direction, and the sealing ring is sleeved in the relief groove and abuts against the Luer connector.

16. The injection device according to claim 11, characterized in that, The number of the openings is multiple, the needle tip is in the shape of a multi-prism, the needle tip is provided with a plurality of prism faces, and each opening is formed on one of the prism faces.

17. The injection device according to claim 10, characterized in that, The needle tip is provided with a groove, and one end of the outer needle tube away from the Luer connector is provided with an opening. The groove communicates with the opening and forms a liquid outlet cavity in combination.

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