CN111529826A

CN111529826A - Injection device

Info

Publication number: CN111529826A
Application number: CN202010466016.7A
Authority: CN
Inventors: 饶建华; 王永刚; 江荣华; 隆龙
Original assignee: Nanjing Kangyou Medical Science & Technology Co ltd
Current assignee: Nanjing Kangyou Medical Science & Technology Co ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2020-08-14

Abstract

The invention discloses an injection device, and relates to the technical field of medical instruments. The injection device comprises a syringe. The elastic mechanism is installed on the outer sleeve, the plunger rod penetrates through the elastic mechanism and extends into the outer sleeve, the plunger rod can move relative to the outer sleeve to draw or inject liquid medicine inwards or outwards, the elastic mechanism is provided with internal threads, external threads are arranged on the peripheral surface of the plunger rod, the elastic mechanism can be pressed outside the plunger rod to enable the internal threads to be meshed with the external threads, and the elastic mechanism can also loosen the plunger rod to enable the internal threads to be separated from the external threads. Compared with the prior art, the injection device provided by the invention adopts the tightening mechanism arranged on the outer sleeve and the plunger rod capable of being in threaded fit with the tightening mechanism, so that the liquid can be quickly absorbed when the liquid medicine is extracted, the injection amount can be accurately controlled when the liquid medicine is injected, and the injection device is convenient and practical.

Description

Injection device

Technical Field

The invention relates to the technical field of medical instruments, in particular to an injection device.

Background

At present, when the liquid medicine is clinically injected to a patient, the injection amount of the liquid medicine is controlled by manually pushing a plunger rod by medical staff. However, the push-pull speed of the plunger rod is not well controlled, so that the injection amount of the liquid medicine cannot be accurately controlled, and the situation that the injection amount of the liquid medicine is too large or insufficient often occurs, so that the health of a patient is affected.

In view of the above, it is important to design and manufacture an injection device capable of accurately controlling the injection amount, especially in the production of medical devices.

Disclosure of Invention

The invention aims to provide an injection device which can realize quick liquid suction when liquid medicine is extracted and can accurately control the injection amount when the liquid medicine is injected, and is convenient and practical.

The invention is realized by adopting the following technical scheme.

The utility model provides an injection device, includes the syringe, and the syringe includes outer sleeve, plunger rod and take-up mechanism, and the take-up mechanism is installed on the outer sleeve, and the plunger rod passes the take-up mechanism, and stretches into in the outer sleeve, and the plunger rod can move about for the outer sleeve to inwards extract or outwards inject the liquid medicine, and the take-up mechanism is provided with the internal thread, is provided with the external screw thread on the global of plunger rod, and the take-up mechanism can compress tightly outside the plunger rod, so that internal thread and external screw thread meshing, the take-up mechanism can also loosen the plunger rod.

Furthermore, the elastic mechanism comprises a screwing piece and an elastic piece, the screwing piece is fixedly connected with the elastic piece, the outer sleeve is in threaded fit with the elastic piece, the internal thread is arranged in the elastic piece, and the screwing piece can drive the elastic piece to rotate relative to the outer sleeve so that the outer sleeve compresses or releases the elastic piece.

Furthermore, the elastic part comprises a first thread part, a connecting part and an elastic part, the first thread part is fixedly connected with the elastic part through the connecting part, the internal thread is arranged in the elastic part, the first thread part is fixedly connected with the screwing part, one end of the outer sleeve is provided with a second thread part, and the second thread part is sleeved outside the first thread part and is in thread fit with the first thread part.

Furthermore, the first thread part and the elastic part are both annular, the diameter of the first thread part is larger than that of the elastic part, the connecting part is flared, the large end of the connecting part is fixedly connected with the first thread part, and the small end of the connecting part is fixedly connected with the elastic part.

Furthermore, the elastic part is provided with a deformation groove, the deformation groove is oppositely provided with a first side wall and a second side wall, and the outer sleeve can compress or release the elastic part so as to enable the first side wall and the second side wall to be folded or separated.

Further, the tightening mechanism comprises a support frame, a first connecting piece and a second connecting piece, the support frame is fixedly connected to one end of the outer sleeve, the first connecting piece and the second connecting piece are detachably connected and are arranged in the support frame, the first connecting piece can be close to or far away from the second connecting piece, the first connecting piece is provided with a third thread portion, the second connecting piece is provided with a fourth thread portion, and the third thread portion and the fourth thread portion are combined to form an internal thread.

Furthermore, the first connecting piece is provided with a first buckle, the second connecting piece is provided with a second buckle, and the first buckle is connected with the second buckle in a clamping mode.

Furthermore, a trigger button is movably arranged on the support frame, the position of the trigger button corresponds to the position of the first buckle, and the trigger button can drive the first buckle to be separated from the second buckle.

Furthermore, the tightening mechanism also comprises a pressure spring which is clamped between the first connecting piece and the second connecting piece.

Furthermore, the first connecting piece is provided with a first accommodating groove, the second connecting piece is provided with a second accommodating groove, the position of the first accommodating groove corresponds to the position of the second accommodating groove, one end of the pressure spring extends into the first accommodating groove, and the other end of the pressure spring extends into the second accommodating groove.

Further, the plunger rod includes rubber buffer, pole body and rotating part, in the one end embedding rubber buffer of pole body, and with rubber buffer fixed connection, the other end and the rotating part fixed connection of pole body, the external screw thread sets up on the global of pole body.

Further, the injection device further comprises an injection needle detachably connected to an end of the outer sleeve remote from the take-up mechanism.

Furthermore, the injection needle comprises a luer connector, a needle head and an outer needle tube, the outer needle tube is detachably connected with the outer sleeve through the luer connector, and the needle head is fixedly connected to one end, far away from the luer connector, of the outer needle tube.

Furthermore, the needle head is provided with an opening which is communicated with the outer needle tube.

Furthermore, syringe needle still includes interior nook closing member and fixing base, and interior nook closing member fixed connection is on the fixing base, and the fixing base slides and sets up in outer needle tubing and luer connects, and the fixing base can drive interior nook closing member and stretch out or indentation trompil.

Furthermore, the fixing base is provided with first bullet knot, and luer connects and is provided with the second bullet and detains, and the spout has been seted up along its length direction to outer syringe, and first bullet knot stretches out the spout, and can slide for the spout, and first bullet knot is buckled with the second bullet and is buckled the joint.

Furthermore, the injection needle also comprises a spring which is arranged in the luer connector and is propped against one end of the fixed seat far away from the inner needle core.

Furthermore, the injection needle further comprises a sealing ring, the fixing seat is provided with a yielding groove along the circumferential direction of the fixing seat, and the sealing ring is sleeved in the yielding groove and abuts against the luer connector.

Furthermore, the quantity of trompil is a plurality of, and the syringe needle is many arriss forms, and the syringe needle is provided with a plurality of facets, and every trompil is seted up on a facet.

Furthermore, the needle head is provided with a groove, one end of the outer needle tube, which is far away from the Ruhr joint, is provided with an opening, and the groove is communicated with the opening and combined to form a liquid outlet cavity.

The injection device provided by the invention has the following beneficial effects:

according to the injection device provided by the invention, the tightening mechanism is arranged on the outer sleeve, the plunger rod penetrates through the tightening mechanism and extends into the outer sleeve, the plunger rod can move relative to the outer sleeve to draw or inject liquid medicine inwards or outwards, the tightening mechanism is provided with internal threads, external threads are arranged on the peripheral surface of the plunger rod, the tightening mechanism can be pressed outside the plunger rod to enable the internal threads to be meshed with the external threads, and the tightening mechanism can also loosen the plunger rod to enable the internal threads to be separated from the external threads. Compared with the prior art, the injection device provided by the invention adopts the tightening mechanism arranged on the outer sleeve and the plunger rod capable of being in threaded fit with the tightening mechanism, so that the liquid can be quickly absorbed when the liquid medicine is extracted, the injection amount can be accurately controlled when the liquid medicine is injected, and the injection device is convenient and practical.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of an injection device according to a first embodiment of the present invention;

fig. 2 is a schematic view of a syringe in an injection device according to a first embodiment of the present invention;

FIG. 3 is a schematic view of the take-up mechanism of FIG. 2;

fig. 4 is a schematic view of a structure of a injection needle in the injection device according to the first embodiment of the present invention;

FIG. 5 is an enlarged view of a portion V of FIG. 4;

FIG. 6 is a schematic view of the FIG. 4 inner core extending from the needle;

FIG. 7 is a schematic structural view of the fixing base shown in FIG. 4;

FIG. 8 is a schematic view of the needle of FIG. 4;

FIG. 9 is a schematic view of a syringe of an injection device according to a second embodiment of the present invention;

FIG. 10 is an exploded view of the take-up mechanism of FIG. 9;

FIG. 11 is a cross-sectional view of the take-up mechanism of FIG. 9;

fig. 12 is a schematic view of a structure of a injection needle in an injection device according to a third embodiment of the present invention;

fig. 13 is a schematic view of a structure of a injection needle in an injection device according to a fourth embodiment of the present invention.

Icon: 10-an injection device; 100-a syringe; 110-an outer sleeve; 111-import and export; 112-port; 120-a plunger rod; 121-external threads; 122-rubber stopper; 123-a rod body; 124-rotating part; 130-a tightening mechanism; 131-internal threads; 132-a screw; 133-an elastic member; 1331-a first threaded portion; 1332-a linker; 1333-a slack portion; 1334-deformation groove; 1335-a first side wall; 1336-a second side wall; 141-a support frame; 142-a pressure spring; 143-a first connecting member; 144-a second connector; 145-a third threaded portion; 146-a fourth threaded portion; 147-a first catch; 148-a second buckle; 149-trigger button; 151-a first receiving groove; 152-a second receiving groove; 200-injection needle; 210-luer fitting; 211-a second snap; 220-a needle head; 221-opening a hole; 222-a facet; 223-grooves; 230-outer needle tube; 232-chute; 233-opening; 240-inner needle core; 250-a fixed seat; 251-a through hole; 252-a first snap; 253-a relief groove; 260-a spring; 270-sealing ring; 280-liquid outlet cavity.

Detailed Description

In order to make the objects, 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.

In recent years, medical image-guided tumor in situ ablation technology has played an important role in the field of minimally invasive therapy, and thermal ablation and chemical ablation are two main ways of tumor in situ ablation. The principle of absolute alcohol injection (PEI) belongs to percutaneous chemical ablation interventional therapy and comprises the following steps: after the absolute alcohol is injected into the tumor, the tumor cells and endothelial cells of blood vessels thereof can be rapidly dehydrated, and the cancer cells are denatured and necrotic due to protein coagulation. Compared with thermal ablation operations such as microwave ablation and radio frequency ablation, the anhydrous alcohol ablation is particularly suitable for focuses located under a liver capsule, beside a great vessel, a bile duct, beside a gallbladder, and near a diaphragm surface or a visceral surface, if the focuses at the positions are subjected to the thermal ablation, if a thermal ablation region is not well mastered, accessory tissues are easily damaged, and serious complications are caused, and injected anhydrous alcohol is mainly dispersed in the tumor due to the limitation of the tumor capsule, so that the influence on the accessory tissues of the tumor is small.

However, the absolute alcohol ablation tumor has some problems in the surgical operation, such as: because there are more or interval connective tissues in the tumor stroma, the absolute alcohol can not be uniformly distributed in the tumor tissue after injection, which results in poor tumor inactivation effect, and a common method for clinically solving the problem is repeated injection or moving needle-withdrawing injection for many times, but the probability of tumor implantation along the needle path is invisibly increased, and meanwhile, the operation is complex, the wound of a patient is large, and the time is long. In addition, the alcohol injection amount during the anhydrous alcohol ablation also needs to be accurately controlled, the accessory tissue is easily damaged when the injection amount is too large, and the expected effect cannot be achieved when the injection amount is too small.

First embodiment

Referring to fig. 1, an embodiment of the present invention provides an injection device 10 for injecting a medical fluid into a patient. It can realize quick imbibition when extracting the liquid medicine, can also be when injecting the liquid medicine accurate control injection volume, convenient and practical.

The injection device 10 includes a syringe 100 and an injection needle 200. Syringe 100 is removably attached to needle 200 to facilitate installation and replacement of needle 200. The syringe 100 is used for storing medical fluid, the injection needle 200 is used for puncturing the skin of a patient, and the syringe 100 can inject the medical fluid stored therein into the patient through the injection needle 200 to realize a medical fluid injection function.

Referring to fig. 2 and 3 in combination, syringe 100 includes an outer sleeve 110, a plunger rod 120, and a take-up mechanism 130. The release mechanism 130 is mounted on outer sleeve 110, and plunger rod 120 passes through release mechanism 130 and extends into outer sleeve 110, and plunger rod 120 can move relative to outer sleeve 110 to draw or inject the liquid medicine inwards or outwards. In the process that the plunger rod 120 gradually extends 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 that the function of drawing the liquid medicine inwards from the outer sleeve 110 is realized; during the process that plunger rod 120 gradually extends into outer sleeve 110, the air pressure inside outer sleeve 110 is greater than the external air pressure, and the liquid medicine is extruded out of outer sleeve 110 under the action of the pressure difference, so that the function of injecting the liquid medicine outwards from outer sleeve 110 is realized.

It should be noted that the tightening mechanism 130 is provided with an internal thread 131, and the plunger rod 120 is provided with an external thread 121 on the circumferential surface thereof, and the internal thread 131 is engaged with the external thread 121. The tightening and loosening mechanism 130 can be pressed outside the plunger rod 120 to enable the internal thread 131 to be meshed with the external thread 121, at this time, the plunger rod 120 can only rotate relative to the tightening and loosening mechanism 130 and can move along the axial direction of the plunger rod 120 in the rotating process 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, so that the sliding speed of the plunger rod 120 is reduced, the accurate control of the sliding speed of the plunger rod 120 is realized, and the accurate control of the injection amount of the liquid medicine is further realized. The tightening mechanism 130 can also loosen the plunger rod 120 to separate the internal thread 131 from the external thread 121, at this time, the plunger rod 120 is separated from the tightening mechanism 130, the plunger rod 120 can directly slide relative to the outer sleeve 110 under the action of external force pushing and pulling, and under this condition, the plunger rod 120 is driven to slide in the outer sleeve 110 in a manner of pulling the plunger rod 120, so that the sliding speed of the plunger rod 120 is increased, and the liquid medicine is rapidly extracted.

In this embodiment, in the process of drawing the liquid medicine, the elastic mechanism 130 releases the plunger rod 120 to separate the internal thread 131 from the external thread 121, and then directly pulls the plunger rod 120 out of the outer sleeve 110 to quickly suck the liquid medicine into the outer sleeve 110, thereby realizing the quick liquid suction function; during the injection of the liquid medicine, the tightening mechanism 130 is firstly pressed against the plunger rod 120 to engage the internal thread 131 with the external thread 121, and then the plunger rod 120 is screwed to translate the plunger rod 120 towards the inside of the outer sleeve 110 during the rotation relative to the tightening mechanism 130, so that the liquid medicine is slowly injected outwards, and the precise control of the injection amount is realized.

It should be noted that, the outer sleeve 110 is provided with the inlet/outlet 111 and the port 112, the inlet/outlet 111 is communicated with the port 112, the take-up mechanism 130 is installed at the port 112, the injection needle 200 is detachably connected to one end of the outer sleeve 110 far away from the take-up 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 move 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.

The take-up mechanism 130 includes a screw 132 and a resilient member 133. The screw 132 is fixedly connected to the elastic member 133, and in the embodiment, the screw 132 and the elastic member 133 are integrally formed to improve the connection strength. Outer sleeve 110 is threadedly engaged with elastic member 133, internal thread 131 is disposed in elastic member 133, and screw 132 can drive elastic member 133 to rotate relative to outer sleeve 110, so that outer sleeve 110 presses or releases elastic member 133, thereby pressing or releasing elastic member 133 from plunger rod 120, and further engaging or disengaging internal thread 131 with external thread 121.

Specifically, when the outer sleeve 110 presses the elastic member 133, the elastic member 133 is deformed and inwardly contracted against its own elastic force by the pressure of the outer sleeve 110, and at this time, the elastic member 133 presses the outside of the plunger rod 120, and the internal thread 131 inside the elastic member 133 is engaged with the external thread 121 on the circumferential surface of the plunger rod 120; when the outer sleeve 110 releases the elastic member 133, the elastic member 133 is resiliently restored and outwardly expanded by its own elasticity, and at this time, the elastic member 133 is separated from the plunger rod 120, and the internal threads 131 inside the elastic member 133 are separated from the external threads 121 on the circumferential surface of the plunger rod 120.

The elastic member 133 includes a first screw part 1331, a connection part 1332, and a loosening and tightening part 1333. The first screw part 1331 is fixedly connected to the elastic part 1333 through a connection part 1332, and in this embodiment, the first screw part 1331, the connection part 1332 and the elastic part 1333 are integrally formed to improve the connection strength. The first thread part 1331 is fixedly connected to the screw 132, and the screw 132 can drive the whole elastic member 133 to rotate through the first thread part 1331. The internal threads 131 are disposed within the boot section 1333, and the boot section 1333 is threadably engaged with the plunger rod 120. One end of the outer sleeve 110 is provided with a second thread part, the second thread part is sleeved outside the first thread part 1331 and is in threaded fit with the first thread part 1331, during the process that the first thread part 1331 rotates relative to the second thread part, the elastic element 133 extends into or retracts out of the port 112 of the outer sleeve 110, during the process, the outer sleeve 110 presses the elastic element 133 or loosens the elastic element 133, so that the elastic element 133 is pressed or separated from the plunger rod 120.

In this embodiment, the first thread part 1331 and the elastic part 1333 are annular, the diameter of the first thread part 1331 is larger than that of the elastic part 1333, the connecting part 1332 is flared, the large end of the connecting part 1332 is fixedly connected with the first thread part 1331, and the small end of the connecting part 1332 is fixedly connected with the elastic part 1333. Specifically, the outer diameter of the first threaded portion 1331 is larger than the inner diameter of the outer sleeve 110, the inner diameter of the outer sleeve 110 is larger than the outer diameter of the elastic portion 1333, and the position of the connecting portion 1332 corresponds to the end surface position of the outer sleeve 110. When resilient member 133 extends into port 112 of outer sleeve 110, the end surface of outer sleeve 110 exerts pressure on connecting portion 1332 to cause connecting portion 1332 to contract inwardly, thereby drawing loose portion 1333 inwardly to contract, and thereby engaging internal threads 131 of loose portion 1333 with external threads 121 of plunger rod 120.

Further, the elastic member 133 is provided with a deformation slot 1334, the deformation slot 1334 is provided with a first side wall 1335 and a second side wall 1336, and the outer sleeve 110 can press or release the elastic member 133 to enable the first side wall 1335 and the second side wall 1336 to be closed or separated. Specifically, the deformation groove 1334 is a through groove, and the deformation groove 1334 is provided through the first screw portion 1331, the connecting portion 1332, and the elastic portion 1333. When resilient member 133 extends into port 112 of outer sleeve 110, the end surface of outer sleeve 110 exerts pressure on resilient member 133 to overcome the force of resilient member 133 and cause first side wall 1335 to close against second side wall 1336, thereby engaging internal threads 131 of resilient member 133 with external threads 121 of plunger rod 120; when the resilient member 133 is retracted out of the port 112 of the outer sleeve 110, the end surface of the outer sleeve 110 no longer exerts pressure on the resilient member 133, and the resilient member 133 separates the first side wall 1335 from the second side wall 1336 under its own resilience, thereby disengaging the internal threads 131 of the resilient member 133 from the external threads 121 of the plunger rod 120.

In this embodiment, the number of the deformation grooves 1334 is two, and the two deformation grooves 1334 are oppositely disposed on two sides of the elastic member 133 to increase the deformation degree of the elastic member 133, so as to achieve the contraction and expansion functions of the elastic member 133. However, the number of the deformation grooves 1334 is not limited to three, and may be four in other embodiments, and the number of the deformation grooves 1334 is not particularly limited.

It should be noted that outer sleeve 110 is made of transparent material, and the surface of outer sleeve 110 is provided with volume scales so as to observe the inhalation volume and the injection volume of the liquid medicine, thereby realizing the precise control of the injection volume. In this embodiment, the elastic member 133 is made of a rubber material to have a good elasticity, but not limited thereto, and in other embodiments, the elastic member 133 may be made of a plastic material, and the material of the elastic member 133 is not particularly limited.

The plunger rod 120 includes a rubber stopper 122, a rod body 123, and a rotation part 124. One end of the rod body 123 is embedded in the rubber plug 122 and is fixedly connected to the rubber plug 122, and the other end of the rod body 123 is fixedly connected to the rotating portion 124. The external thread 121 is provided on the circumferential surface of the rod body 123, and the rod body 123 can be screw-engaged 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.

Referring to fig. 4, 5, 6, 7 and 8, the injection needle 200 includes a luer 210, a needle 220, an outer needle tube 230, an inner core 240, a holder 250, a spring 260 and a sealing ring 270. Outer cannula 230 is removably attached to outer sleeve 110 via luer 210 for ease of installation and replacement. Needle 220 is fixedly connected to an end of outer needle tube 230 remote from luer 210, needle 220 is provided with a hole 221, hole 221 is communicated with outer needle tube 230, and outer sleeve 110 is communicated with hole 221 of needle 220 through luer 210 and outer needle tube 230. In this embodiment, the needle 220 is welded to the outer needle tube 230, the outer needle tube 230 and the inner needle core 240 are both tubular structures, the outer needle tube 230 is made of stainless steel, and the outer surface of the outer needle tube 230 is provided with depth scales, so as to observe the body penetration depth of the outer needle tube 230.

It is noted that the inner needle core 240 is fixedly connected to the fixing seat 250, the fixing seat 250 is slidably disposed in the outer needle tube 230 and the luer 210, the inner needle core 240 is disposed in the outer needle tube 230, and the fixing 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 of or retracts into the opening 221. Specifically, a through hole 251 is formed in the fixing seat 250, the inner needle core 240 is welded to the fixing seat 250 and is communicated with the through hole 251, and the liquid medicine in the outer sleeve 110 can enter the inner needle core 240 through the luer 210 and the through hole 251 of the fixing seat 250 in sequence and can be injected into the patient through the inner needle core 240.

It should be noted that, the number of the opening holes 221, the inner needle cores 240 and the through holes 251 is plural, the needle 220 is in a polygon shape, the needle 220 is provided with a plurality of prism surfaces 222, each opening hole 221 is arranged on one prism surface 222, the plurality of through holes 251 are arranged on the fixing base 250 at intervals in parallel, each through hole 251 is communicated with one inner needle core 240, the position of each inner needle core 240 corresponds to the position of one opening hole 221, the plurality of inner needle cores 240 can move outwards at the same time under the driving of the fixing base 250 to extend out of the plurality of opening holes 221 on the needle 220, thereby realizing the multi-angle simultaneous injection function. In this embodiment, the number of the openings 221, the inner cores 240 and the through holes 251 is three, but the invention is not limited thereto, and in other embodiments, the number of the openings 221, the inner cores 240 and the through holes 251 may be four or five, and the number of the openings 221, the inner cores 240 and the through holes 251 is not particularly limited.

In this embodiment, one end of the inner needle core 240 far from the fixing base 250 is naturally and elastically bent, when the fixing base 250 drives the inner needle core 240 to retract into the opening 221, the inner needle core 240 is straightened under the limiting effect of the needle 220 and the outer needle tube 230, and when the fixing base 250 drives the inner needle core 240 to extend out of the opening 221, the inner needle core 240 is bent outwards under the elastic effect of itself to go deep into the body of the patient and reach the focus area far from the skin of the patient. Specifically, a plurality of interior nook closing member 240 can be stretched out a plurality of trompils 221 and then all around scatter, so that pour into the liquid medicine into patient evenly internal, be convenient for pour into patient evenly anhydrous alcohol into promptly internal, so that evenly distributed is in tumor tissue after anhydrous alcohol pours into, realize the multi-angle and inject simultaneously, improve the deactivation effect to the tumour, reduce repeated injection or remove the injection number of times of moving back the needle, reduce the tumour and follow the chance that the needle track was planted, simplify operation steps simultaneously, alleviate patient's misery, reduce patient's wound and complication, and is practical and reliable.

In this embodiment, the fixing seat 250 is provided with a first elastic buckle 252, and the luer 210 is provided with a second elastic buckle 211. The outer needle tube 230 has a sliding slot 232 along the length direction thereof, and the first elastic buckle 252 extends out of the sliding slot 232 and can slide relative to the sliding slot 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 of or retract into the opening 221. The first elastic buckle 252 is buckled with the second elastic buckle 211 to fix the relative position of the fixing seat 250 and the luer 210, and at this time, the inner stylet 240 is located in the outer needle tube 230, and the second elastic buckle 211 can prevent the inner stylet 240 from extending out of the opening 221.

It should be noted that the spring 260 is disposed in the luer 210 and abuts against an end of the fixing seat 250 away from the inner core wire 240, and the spring 260 is always in a compressed state to apply an elastic force to the fixing seat 250, so that the fixing seat 250 has a tendency to move in a direction away from the luer 210. When the first elastic buckle 252 is fastened to the second elastic buckle 211, the compression amount of the spring 260 is the largest, and at this time, the second elastic buckle 211 applies a clamping force to the fixing seat 250 through the first elastic buckle 252, and the clamping force is balanced with the elastic force of the spring 260, so as to prevent the fixing seat 250 from displacing relative to the luer 210; when the first elastic buckle 252 is separated from the second elastic buckle 211, the elastic force of the spring 260 drives the fixing seat 250 to move in a direction away from the luer 210, so that the inner stylet 240 fixedly connected to the fixing seat 250 extends out of the opening 221.

In this embodiment, the fixing seat 250 is provided with an avoiding groove 253 along the circumferential direction thereof, the sealing ring 270 is sleeved in the avoiding groove 253 and abuts against the luer 210, and the sealing ring 270 can seal the gap between the fixing seat 250 and the luer 210 to prevent the liquid medicine from flowing into the outer needle tube 230 from the gap between the fixing seat 250 and the luer 210. Specifically, the sealing ring 270 is made of a silicone material, and has good elasticity.

When injecting the liquid medicine to the patient, firstly, the injection needle 200 is taken down, and the common needle is arranged on the outer sleeve 110; subsequently unscrewing screw 132 outwards to move elastic element 133 away from outer sleeve 110, while outer sleeve 110 does not apply pressure on elastic element 133, and internal thread 131 of elastic element 133 disengages from external thread 121 of plunger rod 120; then the plunger rod 120 is directly pulled out of the outer sleeve 110 to rapidly suck the liquid medicine into the outer sleeve 110 through a common needle; then, the common needle is taken down, and the injection needle 200 is arranged on the outer sleeve 110; then, under the guidance of medical images, the injection needle 200 is inserted into the lesion to be injected; then the clamping state of the first elastic buckle 252 and the second elastic buckle 211 is released, the fixed seat 250 slides relative to the outer needle tube 230 under the elastic force of the spring 260, so that the inner needle cores 240 extend out of the open hole 221 of the needle head 220, and at the moment, the plurality of inner needle cores 240 are bent and scattered towards the periphery and are uniformly scattered and inserted into the peripheral parts of the tumor; then, screw 132 is screwed inward to move elastic member 133 in a direction approaching outer sleeve 110, while outer sleeve 110 applies pressure to elastic member 133, and internal thread 131 of elastic member 133 engages with external thread 121 of plunger rod 120; then, the plunger rod 120 is rotated to make the plunger rod 120 translate towards the inside of the outer sleeve 110 in the process of rotating relative to the elastic member 133, thereby realizing the precise injection of the liquid medicine; then the first elastic buckle 252 drives the fixed seat 250 to overcome the elastic force of the spring 260 and slide relative to the outer needle tube 230 until the first elastic buckle 252 is clamped with the second elastic buckle 211, and at the moment, the inner needle core 240 retracts into the outer needle tube 230; finally, the needle 200 is pulled out of the patient.

In the injection device 10 provided by the embodiment of the present invention, the tightening mechanism 130 is mounted on the outer sleeve 110, the plunger rod 120 passes through the tightening mechanism 130 and extends into the outer sleeve 110, the plunger rod 120 is movable relative to the outer sleeve 110 to draw or inject the liquid medicine inwards or outwards, the tightening mechanism 130 is provided with the internal thread 131, the circumferential surface of the plunger rod 120 is provided with the external thread 121, the tightening mechanism 130 can be pressed on the outside of the plunger rod 120 to engage the internal thread 131 with the external thread 121, and the tightening mechanism 130 can also loosen the plunger rod 120 to separate the internal thread 131 from the external thread 121. Compared with the prior art, the injection device 10 provided by the invention adopts the tightening mechanism 130 arranged on the outer sleeve 110 and the plunger rod 120 which can be in threaded fit with the tightening mechanism 130, so that the liquid can be quickly absorbed when the liquid medicine is extracted, the injection amount can be accurately controlled when the liquid medicine is injected, and the injection device is convenient and practical.

Second embodiment

Referring to fig. 9, 10 and 11, an injection device 10 according to an embodiment of the present invention is provided, which is different from the first embodiment in the structure of the tightening mechanism 130.

In this embodiment, the tightening mechanism 130 does not include the screw 132 and the elastic member 133, but includes a support frame 141, a pressure spring 142, a first connecting member 143, and a second connecting member 144. Support bracket 141 is fixedly attached to one end of outer sleeve 110, i.e., support bracket 141 is fixedly attached at port 112. The first connecting member 143 and the second connecting member 144 are detachably connected and are both disposed in the supporting frame 141, and the supporting 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 being separated from the outer sleeve 110. The first connecting member 143 is provided with a third screw portion 145, the second connecting member 144 is provided with a fourth screw portion 146, and the third screw portion 145 and the fourth screw portion 146 form an internal screw 131 in combination. The first connecting member 143 can be moved toward or away from the second connecting member 144 to shape or separate the internal threads 131 so that the internal threads 131 engage or disengage the external threads 121 of the plunger rod 120.

In this embodiment, the first connector 143 is provided with a first buckle 147, the second connector 144 is provided with a second buckle 148, and the first buckle 147 is buckled with the second buckle 148 to realize the detachable connection of the first connector 143 and the second connector 144. When the first buckle 147 and the second buckle 148 are in a clamping state, the first connecting piece 143 and the second connecting piece 144 are folded to form the internal thread 131, so that the internal thread 131 is engaged with the external thread 121.

Specifically, the supporting frame 141 is movably provided with a trigger key 149, the position of the trigger key 149 corresponds to the position of the first buckle 147, and the trigger key 149 can drive the first buckle 147 to disengage from the second buckle 148, so as to release the clamping state of the first buckle 147 and the second buckle 148, thereby separating the first connecting part 143 from the second connecting part 144.

It should be noted that the compression spring 142 is sandwiched 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 buckled with the second buckle 148, the compression amount of the compressed spring 142 is maximum, at this time, the clamping force of the first buckle 147 and the second buckle 148 is balanced with the elastic force of the compressed spring 142 to prevent the first connecting piece 143 and the second connecting piece 144 from relative displacement, and the internal thread 131 formed by the combination of the third thread part 145 and the fourth thread part 146 is meshed with the external thread 121 of the plunger rod 120; when the first latch 147 is disengaged from the second latch 148, the first connecting member 143 and the second connecting member are separated from each other by the elastic force of the compression spring 142, so that the internal thread 131 is divided into two halves, and the third threaded portion 145 and the fourth threaded portion 146 are separated and both disengaged from the external thread 121 of the plunger rod 120.

In this embodiment, the number of the compressed springs 142 is four, and the four compressed springs 142 are distributed between the first connecting member 143 and the second connecting member 144 in a rectangular array, so that the stress of the first connecting member 143 and the stress of the second connecting member 144 are balanced, the moving process of the first connecting member 143 and the second connecting member 144 away from or approaching each other is stable and reliable, and the first connecting member 143 and the second connecting member 144 are prevented from shifting or overturning.

In this embodiment, the first accommodating groove 151 is formed in the first connecting member 143, the second accommodating groove 152 is formed in the second connecting member 144, the position of the first accommodating groove 151 corresponds to the position of the second accommodating groove 152, one end of the pressure spring 142 extends into the first accommodating groove 151, the other end of the pressure spring extends into the second accommodating groove 152, the first accommodating groove 151 and the second accommodating groove 152 are both used for limiting the pressure spring 142, so as to limit the extending direction of the pressure spring 142, and thus limit the moving direction in which the first connecting member 143 and the second connecting member 144 are away from or close to each other.

In the process of extracting the liquid medicine, the trigger button 149 is firstly pressed to release the clamping state of the first buckle 147 and the second buckle 148, at this time, the first connecting piece 143 and the second connecting piece 144 are separated from each other under the action of the elastic force of the pressure spring 142, and the third thread part 145 and the fourth thread part 146 are both separated from the external thread 121 of the plunger rod 120; plunger rod 120 is then pulled directly out of outer sleeve 110 to draw the medical fluid quickly into outer sleeve 110, thereby performing a quick-aspirating function. During the process of injecting the liquid medicine, the first connecting part 143 and the second connecting part 144 are pressed simultaneously, so that the first connecting part 143 and the second connecting part 144 approach each other against the elastic force of the compression spring 142 until the first buckle 147 is buckled with the second buckle 148, at this time, the third thread part 145 and the fourth thread part 146 are combined to form the internal thread 131 engaged with the external thread 121, and then the plunger rod 120 is screwed, so that the plunger rod 120 is translated towards the inside of the outer sleeve 110 during the process of rotating relative to the support frame 141, and the liquid medicine is injected outwards slowly, thereby realizing the precise control of the injection amount.

The injection device 10 according to the embodiment of the present invention has the same advantages as the first embodiment, and will not be described herein again.

Third embodiment

Referring to fig. 12, an injection device 10 according to an embodiment of the present invention is different from the first embodiment in the structure of an injection needle 200.

In this embodiment, the injection needle 200 does not include the inner hub 240, the holder 250, the spring 260, and the sealing ring 270, but includes only the luer 210, the needle 220, and the outer needle tube 230. Outer cannula 230 is removably attached to outer sleeve 110 via luer 210 for ease of installation and replacement. The needle 220 is fixedly connected to one end of the outer needle tube 230 far away from the luer 210, the needle 220 is provided with an opening 221, the opening 221 is communicated with the outer needle tube 230, and the liquid medicine in the outer sleeve 110 can be output to a patient through the luer 210, the outer needle tube 230 and the opening 221 on the needle 220 in sequence.

It should be noted that the number of the openings 221 is plural, the needle 220 is in a polygonal shape, the needle 220 is provided with a plurality of facets 222, and each opening 221 is opened on one facet 222. In this embodiment, the number of the openings 221 is three, but not limited thereto, and in other embodiments, the number of the openings 221 may be four or five, and the number of the openings 221 is not particularly limited.

Specifically, when the liquid medicine is injected to a patient, the liquid medicine is directly injected to the periphery through the plurality of open holes 221 on the needle head 220, multi-angle simultaneous injection can be realized, and uniform injection to a certain degree is realized, so that the liquid medicine injection device is particularly suitable for small tumors with the diameter of about one centimeter.

Fourth embodiment

Referring to fig. 13, an injection device 10 according to an embodiment of the present invention is different from the third embodiment in the structure of the needle 220 and the outer needle tube 230.

In this embodiment, the needle 220 is no longer provided with the opening 221, but a groove 223 is provided on a side surface of the needle 220, an opening 233 is provided on an inner side wall of the outer needle tube 230, the opening 233 is provided at one end of the outer needle tube 230 away from the luer 210, the groove 223 is communicated with the opening 233 and forms a liquid outlet cavity 280 in combination, and the liquid outlet cavity 280 is used for outputting liquid medicine. The medical fluid in outer sleeve 110 can be delivered to the patient sequentially through luer 210, outer needle tube 230 and fluid outlet cavity 280.

Specifically, when the liquid medicine is injected to a patient, the liquid medicine is directly injected to the periphery through the liquid outlet cavity 280 between the needle head 220 and the outer needle tube 230, and the multi-angle simultaneous injection can be realized, so that the uniform injection to a certain degree is realized.

The beneficial effects of the injection device 10 provided by the embodiment of the present invention are the same as those of the third embodiment, and are not described herein again.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The injection device is characterized by comprising an injector, wherein the injector comprises an outer sleeve, a plunger rod and a tightening mechanism, the tightening mechanism is installed on the outer sleeve, the plunger rod penetrates through the tightening mechanism and extends into the outer sleeve, the plunger rod can move relative to the outer sleeve to draw or inject liquid medicine inwards or outwards, the tightening mechanism is provided with internal threads, external threads are arranged on the circumferential surface of the plunger rod, the tightening mechanism can be pressed outside the plunger rod to enable the internal threads to be meshed with the external threads, and the tightening mechanism can also loosen the plunger rod to enable the internal threads to be separated from the external threads.

2. The injection device as defined in claim 1, wherein the tightening mechanism includes a screwing member and an elastic member, the screwing member is fixedly connected with the elastic member, the outer sleeve is in threaded engagement with the elastic member, the internal thread is disposed in the elastic member, and the screwing member can drive the elastic member to rotate relative to the outer sleeve so as to enable the outer sleeve to compress or loosen the elastic member.

3. The injection device as claimed in claim 2, wherein the elastic member comprises a first threaded portion, a connecting portion and a tightening portion, the first threaded portion is fixedly connected with the tightening portion through the connecting portion, the internal thread is disposed in the tightening portion, the first threaded portion is fixedly connected with 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 fit with the first threaded portion.

4. The injection device as defined in claim 3, wherein the first threaded portion and the boot portion are both annular, the first threaded portion has a diameter greater than a diameter of the boot portion, the connecting portion is flared, a large end of the connecting portion is fixedly connected to the first threaded portion, and a small end of the connecting portion is fixedly connected to the boot portion.

5. The injection unit of claim 2, wherein the resilient member defines a deformation groove having a first side wall and a second side wall opposite to the deformation groove, and the outer sleeve is capable of compressing or relaxing the resilient member to cause the first side wall and the second side wall to move together or apart.

6. The injection device as defined in claim 1, wherein the take-up 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 both disposed in the support frame, the first connecting member can be close to or away from the second connecting member, the first connecting member is provided with a third threaded portion, the second connecting member is provided with a fourth threaded portion, and the third threaded portion and the fourth threaded portion are combined to form the internal thread.

7. The injection device as set forth in claim 6, wherein the first connector is provided with a first catch and the second connector is provided with a second catch, the first catch being snap-fitted with the second catch.

8. The injection device as claimed in claim 7, wherein a trigger button is movably disposed on the support frame, the trigger button is located corresponding to the first buckle, and the trigger button can drive the first buckle to disengage from the second buckle.

9. The injection device of claim 6, wherein the take-up mechanism further comprises a compression spring sandwiched between the first connector and the second connector.

10. The injection device as defined in claim 9, wherein the first connecting member defines a first receiving groove, the second connecting member defines a second receiving groove, the first receiving groove is located at a position corresponding to the second receiving groove, and one end of the compression spring extends into the first receiving groove and the other end extends into the second receiving groove.

11. The injection device as claimed in claim 1, wherein the plunger rod comprises a rubber stopper, a rod body and a rotating part, one end of the rod body is embedded in the rubber stopper and fixedly connected with the rubber stopper, the other end of the rod body is fixedly connected with the rotating part, and the external threads are arranged on the circumferential surface of the rod body.

12. The injection unit of any one of claims 1 to 11, further comprising an injection needle removably attached to an end of the outer sleeve distal from the take-up mechanism.

13. The injection device as defined in claim 12, wherein the injection needle comprises a luer, a needle and an outer needle cannula, the outer needle cannula being detachably connected to the outer sleeve by the luer, the needle being fixedly connected to an end of the outer needle cannula remote from the luer.

14. The injection device of claim 13, wherein the needle defines an opening, the opening communicating with the outer needle cannula.

15. The injection device as defined in claim 14, wherein the injection needle further comprises an inner needle core and a fixing seat, the inner needle core is fixedly connected to the fixing seat, the fixing seat is slidably disposed in the outer needle tube and the luer connector, and the fixing seat can drive the inner needle core to extend out of or retract into the opening.

16. The injection device as claimed in claim 15, wherein the holder is provided with a first snap fastener, the luer connector is provided with a second snap fastener, the outer needle cannula is provided with a sliding slot along a length direction thereof, the first snap fastener extends out of the sliding slot and can slide relative to the sliding slot, and the first snap fastener is clamped with the second snap fastener.

17. The injection device as defined in claim 15, wherein the injection needle further comprises a spring disposed in the luer connector and abutting against an end of the holder remote from the inner hub.

18. The injection device as claimed in claim 15, wherein the injection needle further comprises a sealing ring, the fixing seat is provided with an abdicating groove along a circumferential direction thereof, and the sealing ring is sleeved in the abdicating groove and abuts against the luer connector.

19. The injection device as defined in claim 14, wherein said opening is plural in number, said needle is polygonal, said needle is provided with a plurality of facets, and each said opening opens onto one of said facets.

20. The injection device as defined in claim 13, wherein said needle defines a recess, and an end of said outer cannula distal from said luer defines an opening, said recess communicating with said opening and combining to form a fluid-dispensing cavity.