CN108853649B

CN108853649B - Medical nursing syringe

Info

Publication number: CN108853649B
Application number: CN201810441634.9A
Authority: CN
Inventors: 张丕宁; 魏翠英; 周海英
Original assignee: Affiliated Hospital of University of Qingdao
Current assignee: Affiliated Hospital of University of Qingdao
Priority date: 2018-05-10
Filing date: 2018-05-10
Publication date: 2021-03-12
Anticipated expiration: 2038-05-10
Also published as: CN108853649A

Abstract

The invention discloses a medical nursing injector, which comprises: a cylinder body, both ends of which are open; the piston is arranged in the cylinder and can axially slide along the cylinder; the front end of the push rod extends into the cylinder body and is connected with the piston, the rear end of the push rod extends out of the rear end of the cylinder body, and a push disc for pushing a hand is arranged at the rear end of the push rod; a flow restriction assembly coupled to a front end of the cylinder; the end body is combined on the current limiting assembly, and a liquid outlet head is formed on the end body; wherein: when the piston is pushed against the liquid medicine in the cylinder under the action of the push rod so that the liquid medicine flows through the flow limiting assembly and flows out of the liquid outlet head of the end body, the flow limiting assembly limits the flow of the liquid medicine. The invention utilizes the flow limiting component to ensure that the liquid medicine flows out at a constant flow, thereby ensuring that the flow of the liquid medicine is not influenced by the change of the human hand thrust.

Description

Medical nursing syringe

Technical Field

The invention relates to the technical field of medicine, in particular to a medical nursing injector.

Background

Related devices for receiving, aspirating or infusing medical fluids in prior art hospitals have a number of problems.

For example, in a hospital in the related art, a medical solution is usually stored in a small glass bottle, the mouth of the small glass bottle is sealed by an elastic rubber plug, and when the medical solution is needed, for example, when the medical solution needs to be injected into a transfusion tube or when the medical solution is directly injected into a human body, it is necessary to insert the needle of a syringe into the bottle through the rubber plug, suck the medical solution into the syringe, and then inject the medical solution into the transfusion tube or the human body by using the syringe. If the liquid medicine needs to be diluted, the syringe needs to suck the diluent after the liquid medicine is sucked, and the operation is troublesome.

For example, in a prior art hospital, in a process in which a syringe injects a liquid medicine into a human body or a liquid transport tube, an injection rate of the liquid medicine (an amount of the injected liquid medicine per unit time) depends on a rate at which a hand of a caregiver pushes a piston, and the rate at which the hand pushes the piston is unbalanced, so that the injection rate of the liquid medicine is also unbalanced. However, for the treatment of certain diseases, the infusion rate of the liquid medicine into the infusion tube or the human body needs to be maintained in a relatively stable state, otherwise serious consequences can occur.

Disclosure of Invention

In view of the above technical problems in the prior art, embodiments of the present invention provide a syringe.

In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:

a medical care injector, comprising:

a cylinder body, both ends of which are open;

the piston is arranged in the cylinder and can axially slide along the cylinder;

the front end of the push rod extends into the cylinder body and is connected with the piston, the rear end of the push rod extends out of the rear end of the cylinder body, and a push disc for pushing a hand is arranged at the rear end of the push rod;

a flow restriction assembly coupled to a front end of the cylinder;

the end body is combined on the current limiting assembly, and a liquid outlet head is formed on the end body; wherein:

when the piston is pushed against the liquid medicine in the cylinder under the action of the push rod so that the liquid medicine flows through the flow limiting assembly and flows out of the liquid outlet head of the end body, the flow limiting assembly limits the flow of the liquid medicine.

Preferably, the current limiting assembly includes:

the cylinder is provided with a first end and a second end, the first end of the cylinder is plugged at the front end of the cylinder, and the end body is combined with the second end of the cylinder;

the sliding cavity is arranged in the column body;

the liquid inlet channel is arranged on the cylinder body, one end of the liquid inlet channel penetrates through the first end of the cylinder body, and the other end of the liquid inlet channel penetrates to the sliding cavity so as to enable the sliding cavity to be communicated with the cylinder body;

the liquid outlet channel is arranged on the column body, one end of the liquid outlet channel penetrates through the second end of the column body so as to enable the liquid outlet channel to be communicated with the liquid outlet head, and the other end of the liquid outlet channel penetrates through the sliding cavity;

the sliding body is arranged in the sliding cavity and can slide along the sliding cavity, and the sliding body can adjust the opening degree of a port at one end, communicated with the sliding cavity, of the liquid inlet channel through sliding;

a biasing mechanism for biasing the slider in a direction to increase the opening degree of the port;

the action channel is arranged on the column body, the action flow channel is communicated with the liquid outlet channel, and the action channel is used for guiding the liquid in the liquid outlet channel to push the sliding body towards the direction which enables the opening end of the port to be reduced.

Preferably, the end body includes a disk-shaped body, the liquid outlet head is integrally formed on an outer disk surface of the disk-shaped body, a sinking groove is formed on an inner disk surface of the disk-shaped body, an inner pore channel of the liquid outlet head penetrates through to a groove bottom of the sinking groove, wherein:

one end of the liquid outlet channel, which penetrates through the second end of the column body, faces the sinking groove, so that the liquid outlet channel is communicated with the inner hole of the liquid outlet head through the sinking groove.

Preferably, the column body is further provided with a liquid suction channel, the liquid suction channel penetrates through two ends of the column body to be used for communicating the cylinder body with the liquid outlet head, and the flow limiting assembly further comprises a first one-way valve and a second one-way valve; wherein

The first one-way valve is arranged in the liquid outlet channel, and an outlet of the first one-way valve is communicated towards the liquid outlet head;

the second one-way valve is arranged in the liquid suction channel, and an outlet of the second one-way valve faces the cylinder.

Preferably, a first coupling shoulder is formed at a first end of the cylinder, the first coupling shoulder is detachably and hermetically coupled to the front end of the cylinder, and a second coupling shoulder is formed on an inner disc surface of the disc-shaped body, and the second coupling shoulder is detachably and hermetically coupled to a second end of the cylinder; wherein:

the first coupling shoulder and the second coupling shoulder are identical so that the second coupling shoulder can be detachably coupled to the front end of the cylinder.

Preferably, a spring is arranged in the cylinder and between the piston and the rear end of the cylinder, so that the spring can apply force to the piston towards the front end of the cylinder.

Compared with the prior art, the medical nursing injector disclosed by the invention has the beneficial effects that: the liquid medicine flow limiting device utilizes the flow limiting component to enable liquid medicine to flow out at a constant flow, so that the flow of the liquid medicine is not affected by the change of the pushing force of hands of nursing staff.

Drawings

Fig. 1 is a front view of a chemical solution containing apparatus according to an embodiment of the present invention.

Fig. 2 is a view taken along direction a of fig. 1.

Fig. 3 is a view showing a state in which a bag of the liquid medicine storage device according to the embodiment of the present invention is compressed.

Fig. 4 is a view from direction B of fig. 3.

Fig. 5 is a front view of a medical care injector provided in accordance with an embodiment of the present invention.

Fig. 6 is a front view of a medical care injector with a balloon in a compressed state according to an embodiment of the present invention.

Fig. 7 is a front view of a medical care injector (with the piston in a reciprocating state) provided in accordance with an embodiment of the present invention.

Fig. 8 is a front view of a medical care syringe according to an embodiment of the present invention (in a state where the liquid medicine collecting device is removed).

Fig. 9 is a front view of a medical care injector provided in accordance with another embodiment of the invention (with the medical care injector in an unused state).

Fig. 10 is an enlarged view of a portion C of fig. 9.

Fig. 11 is a front view of a medical care injector provided in accordance with another embodiment of the present invention (the medical care injector is in a pipette state).

Fig. 12 is an enlarged view of a portion D of fig. 11.

Fig. 13 is a front view of a medical care injector provided in accordance with another embodiment of the invention (the medical care injector being in an injection state).

Fig. 14 is an enlarged view of a portion E of fig. 13.

Fig. 15 is a front view of a medical care injector provided in accordance with yet another embodiment of the invention (the medical care injector being in an injection state).

Fig. 16 is a front view of a medical care injector provided in accordance with an embodiment of the present invention (with the medical care injector in a state in which the flow restriction assembly is removed).

In the figure:

100-medical care syringes; 10-a cylinder body; 11-a second junction; 111-plugging; 20-a piston; 30-a push rod; 31-a push plate; 40-a chamber; 50-end body; 51-a liquid outlet head; 52-a disc-shaped body; 521-a second coupling shoulder; 60-a current limiting assembly; 61-column; 611-a first coupling shoulder; 62-a slide cavity; 63-a slide; 64-a liquid inlet channel; 65-a liquid outlet channel; 651-first one-way valve; 652-the active channel; 653-port; 66-a pipetting channel; 661-a second one-way valve; 67-end cap; 671A first magnetic ring; 672-a second magnetic ring; 70-a spring; 200-a liquid medicine storage device; 210-pouch; 220-a holding portion; 221-a first plate body; 222-a second plate body; 223-a coupling sleeve; 224-a flow channel; 230-a blocking membrane; 231-a score cut; 300-human hand.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 4, an embodiment of the present invention discloses a medical fluid storage device 200, wherein the medical fluid storage device 200 includes a pouch 210, a holding portion 220, a blocking film 230, and a first coupling portion. The pouch 210 is made of a flexible material, for example, silicon, and the pouch 210 accommodates a liquid medicine for treating a certain disease therein, and the liquid medicine is filled in the pouch 210 when the liquid medicine container 200 is manufactured, and the pouch 210 has an open end formed by shrinkage. The holding portion 220 has a disk shape, the holding portion 220 is used for combining the sachet 210, for example, the open end of the sachet 210 is combined on the holding portion 220 by clamping or bonding, and a flow passage 224 is formed at the position of the holding portion 220 opposite to the open end. The blocking film 230 is also made of a flexible material, for example, made of silicon gel, the blocking film 230 is disposed at a position close to the open end of the flow channel 224, and the blocking film 230 is bonded to the holding portion 220, wherein a dividing trace 231 is formed on a film surface of the blocking film 230 opposite to the pouch 210, a radially inward depth of the dividing trace 231 is greater than a radially outward depth of the dividing trace 231, as shown in fig. 1 and fig. 2, the dividing trace 231 makes the blocking film 230 not allow the liquid medicine to pass through when the blocking film 230 is not pressed by the liquid medicine; as shown in fig. 2 and 4, when pressed by the chemical solution, the blocking film 230 is broken at the dividing mark 231, so that the chemical solution flows out at the broken portion. A first coupling portion is formed on the holding portion 220, and the first coupling portion is coupled to an external device so that the chemical liquid storage device 200 is mounted on the external device and simultaneously the chemical liquid flowing out from the damaged portion enters the cavity of the external device, for example, a liquid funnel on an infusion tube, and the liquid funnel is correspondingly provided with a coupling structure, for example, a connection nozzle, and the first coupling portion is coupled to the connection portion, so that when the chemical liquid is injected into the funnel, the bag 210 is pressed by a hand, and the blocking film 230 is damaged at the division mark 231 by the chemical liquid and the chemical liquid flows out and flows into the liquid funnel. For another example, the external device is the medical care syringe 100, the medical care syringe 100 is also provided with a coupling structure, for example, a connection nozzle, and the first coupling portion is coupled to the coupling structure, so that when a medical solution needs to be injected into the medical care syringe 100, the bag 210 is pressed by a hand, and the medical solution presses the blocking film 230 to be broken at the division mark 231, and the medical solution flows out and flows into the medical care syringe 100. Preferably, the scribe line 231 includes two lines, and the two scribe lines 231 cross each other crosswise.

The medical fluid storage device 200 provided by the invention can directly inject medical fluid into a cavity such as an infusion tube and the medical care injector 100 by being squeezed by a human hand 300, and a suction mode through the medical care injector 100 is not needed.

The medical fluid storage device 200 is particularly suitable for use with the medical care syringe 100, or is particularly suitable for use as an accessory for the medical care syringe 100. The advantages of which are described later.

In a preferred embodiment of the present invention, as shown in fig. 1 to 4, the holding portion 220 includes a first plate 221 and a second plate 222; the first plate 221 and the second plate 222 are stacked and bonded by glue, the edge of the blocking film 230 is clamped between the first plate 221 and the second plate 222, and the open end is combined with the first plate 221. A coupling sleeve 223 is formed on the lower plate surface of the second plate body 222, the outer wall of the coupling sleeve 223 is threaded, the coupling sleeve 223 forms a first coupling portion, and an inner hole of the coupling sleeve 223 forms a section of flow passage 224.

The invention also discloses a medical nursing injector 100, as shown in fig. 5 to 8, the medical nursing injector 100 comprises a cylinder 10, a liquid outlet 51 arranged at the front end of the cylinder 10, a piston 20 arranged in the inner cavity of the cylinder 10, a push rod 30 with one end connected with the piston 20 and the other end extending out of the rear end of the cylinder 10, and the liquid medicine accommodating device 200, wherein: the cylinder 10 is provided with a second coupling portion 11, and the first coupling portion of the chemical solution storage device 200 is coupled to the second coupling portion 11 to communicate the flow path 224 with the chamber 40 of the cylinder 10.

When the first coupling part is a coupling sleeve 223 having an external thread, the second coupling part 11 of the cylinder 10 is formed as a tubular joint having an internal thread, and the coupling sleeve 223 is screwed into the tubular joint, so that the chemical solution containing device 200 is mounted on the cylinder 10.

The method of using the medical care syringe 100 incorporating the medical fluid storage device 200 of the present invention will now be described. And thereby illustrate the advantages of the medical care injector 100.

When only the liquid medicine in the bag 210 needs to be injected into a human body or a transfusion tube without dilution, the liquid medicine containing device 200 is arranged on the cylinder 10, the push rod 30 is pulled to move the piston 20 to the left for a certain distance, so that the containing device is opposite to the cavity 40 enclosed by the piston 20 and the cylinder 10, as shown in fig. 6, then the bag 210 is squeezed by a human hand 300 to force the blocking film 230 to be damaged, so that the liquid medicine flows into the cavity 40, then the liquid medicine containing device 200 is detached, the tubular joint is blocked by the blocking plug 111, then the push rod 30 is pushed, and the liquid medicine flowing into the cavity 40 is injected into the transfusion tube or the human body through the liquid outlet head 51 under the action of the piston 20.

When the drug solution needs to be diluted and then injected into a human body or a transfusion tube, the drug solution storage device 200 is mounted on the cylinder 10, the push rod 30 is pulled to move the piston 20 to the left for a distance, so that the storage device is opposite to the cavity 40 enclosed by the piston 20 and the cylinder 10, then the human hand 300 squeezes the bag 210 to force the blocking membrane 230 to be damaged, so that the drug solution flows into the cavity 40, then the liquid outlet head 51 (the liquid outlet head 51 also has the function of allowing external liquid to enter the cylinder 10, and the liquid outlet head 51 is not named as the liquid outlet head 51 and does not have the function of introducing liquid into the cylinder 10) extends into the diluent, then the push rod 30 is continuously pulled, so that the required diluent is sucked into the cavity 40, then the liquid outlet head 51 is blocked by using the blocking cap as shown in fig. 7, then the piston 20 is reciprocated by the push rod 30, on the one hand, so that the drug solution in the cavity 40 is fully mixed with the diluent, on the other hand, as the piston 20 reciprocates, liquid continues to enter the bladder 210 to flush out residual liquid medicine so that almost all of the liquid medicine enters the chamber 40. Then, as shown in FIG. 8, the drug solution storage device 200 is removed, the tubular joint is sealed by the plug 111, and the plug cap is removed, the piston 20 is pushed, and the diluted drug solution is injected into the human body or the infusion tube by the liquid outlet 51 (to which a needle can be attached).

When the medical fluid in the pouch 210 of the medical fluid storage device 200 is not needed to be used, the stopper 111 is used to block the tubular connector, and the medical care syringe 100 is used in a similar manner to the medical care syringe 100 of the related art.

The medical care injector 100 described above has the advantages that:

1. so that the injection molding device does not need to suck the liquid medicine from the glass container for containing the liquid medicine.

2. The advantages are particularly outstanding: the liquid medicine can dilute in barrel 10, need not to dilute outside medical care syringe 100, has reduced the contaminated risk of liquid medicine, and is important: as shown in fig. 7, the contractibility of the bladder 210 allows the piston 20 to reciprocate during mixing and diluting of the liquid medicine, so that the liquid flows between the bladder 210 and the chamber 40, which tends to increase the mixing and diluting rate of the liquid medicine.

Also disclosed in one embodiment of the present invention is a medical care injector 100, the medical care injector 100 having the structural features provided in the embodiments described above, with further preferred structural features. As shown in fig. 9 to 16, in particular, the medical care injector 100 includes: barrel 10, piston 20, pushrod 30, flow restrictor assembly 60, and end body 50. Both ends of the cylinder 10 are open; the piston 20 is arranged in the cylinder 10 and can slide along the cylinder 10 in the axial direction; the front end of the push rod 30 extends into the cylinder 10 and is connected with the piston 20, the rear end of the push rod extends out of the rear end of the cylinder 10, and the rear end of the push rod 30 is provided with a push disc 31 for pushing by hand; the flow restriction assembly 60 is coupled to the front end of the cylinder 10; the end body 50 is combined on the current limiting assembly 60, and a liquid outlet head 51 is formed on the end body 50; wherein: when the piston 20 is pushed against the liquid medicine in the cylinder 10 by the action of the push rod 30, so that the liquid medicine flows through the flow limiting assembly 60 and flows out from the liquid outlet head 51 of the end body 50, the flow limiting assembly 60 limits the flow of the liquid medicine. That is, when the medical fluid (which may be diluted medical fluid or undiluted medical fluid) in the chamber 40 of the medical care syringe 100 needs to be injected into a device such as a human body or an infusion tube, for example, into a funnel of the infusion tube, the flow restriction member 60 can inject the medical fluid into the device such as the human body or the infusion tube at a constant flow rate.

As shown in fig. 9 to 16, the current limiting assembly 60 having the above-described function includes: cylinder 61, slide cavity 62, inlet channel 64, outlet channel 65, sliding body 63, forcing mechanism, action channel 652. Wherein, the diameter of the cylinder 61 is substantially equal to the diameter of the cylinder 10, the first end of the cylinder 61 is sealed at the front end of the cylinder 10, and the end body 50 is combined with the second end of the cylinder 61; the sliding cavity 62 is arranged in the column body 61; the liquid inlet channel 64 is arranged on the column body 61, one end of the liquid inlet channel 64 penetrates through the first end of the column body 61, and the other end of the liquid inlet channel 64 penetrates to the sliding cavity 62, so that the sliding cavity 62 is communicated with the cylinder body 10; the liquid outlet channel 65 is arranged on the column body 61, one end of the liquid outlet channel 65 penetrates through the second end of the column body 61 so that the liquid outlet channel 65 is communicated with the liquid outlet head 51, and the other end of the liquid outlet channel 65 penetrates through the sliding cavity 62 so that the liquid outlet head 51 is communicated with the sliding cavity 62 through the liquid outlet channel 65; the sliding body 63 is arranged in the sliding cavity 62 and can slide along the sliding cavity 62, and the opening degree of the port 653 at one end of the liquid inlet channel 64 communicated with the sliding cavity 62 is adjusted by the sliding body 63; the urging mechanism is for urging the slider 63 in a direction to increase the opening degree of the port 653; the action passage 652 is opened in the cylinder 61, the action flow passage 224 communicates with the outlet passage 65, and the action passage 652 is used for guiding the liquid in the outlet passage 65 to push against the sliding body 63 in a direction to decrease the opening end of the port 653. Wherein, the forcing mechanism has following characteristics: the force applied to the sliding body 63 by the force applying mechanism does not change with the position of the sliding body 63, that is, the force applied to the sliding body 63 by the force applying mechanism does not change substantially during the movement of the sliding body 63, and such force applying mechanisms may be various, for example, a coil spring with a small elastic coefficient and a large compression degree may be used as the force applying mechanism. Preferably, the liquid outlet head 51 is integrally formed on the outer disc surface of the disc-shaped body 52, a sinking groove is formed on the inner disc surface of the disc-shaped body 52, an inner pore passage of the liquid outlet head 51 penetrates through to the groove bottom of the sinking groove, wherein: one end of the liquid outlet channel 65 penetrating through the second end of the column body 61 faces the sink groove, so that the liquid outlet channel 65 is communicated with the inner hole of the liquid outlet head 51 through the sink groove. The sink groove has the following functions: at least the liquid outlet channel 65 is communicated with the liquid outlet head 51.

The following describes the reason why the medical care syringe 100 of the prior art cannot discharge the liquid medicine at a constant flow rate and the reason why the medical care syringe 100 of the present invention can discharge the liquid medicine at a constant flow rate through the flow restriction assembly 60.

Since the outflow speed of the liquid medicine in the chamber 40 enclosed by the piston 20 is directly determined by the speed of the human hand 300 pushing against the piston 20, the speed of pushing against the piston 20 is strictly related to the pushing force of the hand, and the pushing force of the hand against the piston 20 is unbalanced during the whole injection process, which makes the pushing speed unbalanced during the whole pushing process, so that: the medical care syringe 100 according to the related art cannot inject the medical fluid into an external device such as a human body or an infusion tube at a constant flow rate.

The reason why the medical nursing syringe 100 of the present invention can inject the medical fluid into the external device such as the human body or the infusion tube at a constant flow rate is that the flow restriction member 60 allows the medical fluid to flow out at a constant flow rate without being restricted by the magnitude of the force applied by the hand, that is, the flow restriction member 60 allows the hand to serve only as the motive force for the medical fluid to flow, thereby releasing the control of the flow rate of the medical fluid.

The operation of the current limiting assembly 60 will now be described.

When the liquid medicine needs to be injected into a human body or external equipment, a force is applied to the push rod 30, so that the piston 20 presses the liquid medicine, the liquid medicine enters the sliding cavity 62 through the liquid inlet channel 64, enters the inner hole of the liquid outlet head 51 through the liquid outlet channel 65, and flows out through the liquid outlet head 51 to be injected into the human body or the external equipment, because the acting channel 652 is communicated with the liquid outlet channel 65, the liquid medicine enters the acting channel 652 and is led into one end of the sliding body 63 through the acting channel 652 to push against the sliding body 63, in this way, the sliding body 63 (the sliding body 63 is made of a light material, and the self gravity thereof) is stressed in balance after being subjected to two forces, wherein the two forces are: first, the force of the liquid flowing out of the active channel 652 against the slider 63; the other is the force of the force applying mechanism to the sliding body 63, and at this time, the sliding body 63 is kept at a certain position of the sliding chamber 62 due to the force balance.

When the force applied to the push rod 30 by the human hand 300 increases, the pressure of the liquid medicine in the liquid inlet passage 64 and the liquid outlet passage 65 increases, and at the same time, the force with which the liquid medicine pushes against the sliding body 63 also increases, the force balance of the sliding body 63 is broken, the sliding body 63 slides in the direction in which the opening degree of the port 653 decreases, and when the sliding body slides to a certain position, the force applied to the sliding body 63 is balanced again.

When the force applied to the push rod 30 by the human hand 300 is reduced, the pressure of the liquid medicine in the liquid inlet passage 64 and the liquid outlet passage 65 is reduced, and at the same time, the force with which the liquid medicine pushes against the sliding body 63 is also reduced, the force balance of the sliding body 63 is broken, the sliding body 63 slides in the direction in which the opening degree of the port 653 is increased, and when the sliding body slides to a certain position, the force applied to the sliding body 63 is balanced again.

As can be seen from the above, no matter the force applied to the push rod 30 increases or decreases, the sliding body 63 can always reach a force balance state through sliding, and the acting force of the force applying mechanism on the sliding body 63 is not changed by the change of the position of the sliding body 63, so that the acting force of the liquid medicine on the sliding body 63 is not changed after the pressure of the liquid medicine is decreased or increased, which means that the acting channel 652 and the liquid outlet channel 65 are not affected by the magnitude of the force applied by the force applicator. Further, since the cavity of the external device and the tissue environment of the human body can be regarded as an environment with a pressure of atmospheric pressure, for example, the pressure above the liquid surface of the liquid funnel of the infusion tube is atmospheric pressure, it can be regarded that the pressure of the liquid medicine flowing out from the outlet end of the liquid outlet head 51 is constant 0, and the pressure of the liquid medicine at the inlet end of the liquid outlet head 51 is equal to the pressure of the liquid medicine in the liquid outlet channel 65 because the inlet end of the liquid outlet head 51 is communicated with the liquid outlet channel 65, so that the pressure difference between the two ends of the liquid outlet head 51 is kept substantially constant, and the flow rate of the liquid medicine flowing out from the liquid outlet head 51 is kept constant.

In order to prevent the medical nursing syringe 100 from entering the cavity 40 of the barrel 10 through the liquid outlet channel 65, the sliding cavity 62 and the carrying channel in sequence during the process of sucking liquid, in a preferred embodiment of the present invention, the cylinder 61 is separately provided with a liquid suction channel 66, the liquid suction channel 66 penetrates through two ends of the cylinder 61 to communicate the barrel 10 with the liquid outlet head 51, and the flow limiting assembly 60 further includes a first one-way valve 651 and a second one-way valve 661; wherein, the first one-way valve 651 is arranged in the liquid outlet channel 65, and an outlet of the first one-way valve 651 is communicated towards the liquid outlet head 51; a second check valve 661 is provided in the suction passage 66, and an outlet of the second check valve 661 faces the cylinder 10.

As described above, when it is necessary to absorb the external liquid, the first check valve 651 is closed and the second check valve 661 is opened, as shown in fig. 11 and 12, so that the external liquid is introduced into the chamber 40 through the liquid outlet head 51 and the liquid suction passage 66. As shown in fig. 13 and 14, when the liquid medicine needs to be injected into the human body or the external device, the second check valve 661 is closed and the first check valve 651 is opened, so that the liquid medicine is injected into the human body or the external device through the liquid inlet passage 64, the slide chamber 62, the liquid outlet passage 65 and the liquid outlet head 51 as described above.

In a preferred embodiment of the present invention, as shown in fig. 10, a first coupling shoulder 611 is formed at a first end of the cylinder 61, the first coupling shoulder 611 is detachably and sealingly coupled to the front end of the cylinder 10, a second coupling shoulder 521 is formed on the inner disk surface of the disk-shaped body 52, and the second coupling shoulder 521 is detachably and sealingly coupled to a second end of the cylinder 61; wherein: the first coupling shoulder 611 and the second coupling shoulder 521 are identical so that the second coupling shoulder 521 can be detachably coupled to the front end of the cylinder 10.

In view of the above, the present invention is directed to a medical care injector 100 of the prior art by removing the flow restriction assembly 60 and attaching the end body 50 directly to the barrel 10, as shown in fig. 16.

In a preferred embodiment of the present invention, as shown in fig. 15, a spring 70 is provided in the cylinder 10, and the spring 70 is provided between the piston 20 and the rear end of the cylinder 10 so that the spring 70 can apply force to the piston 20 toward the front end of the cylinder 10. Specifically, a detachable stopper ring is provided at the rear end of the cylinder bottom, and a spring 70 is provided between the stopper ring and the piston 20. In the present embodiment, the spring 70 is used to bias the piston 20, so that the force applied by the spring 70 can be used to power the injection of the medical solution, thereby freeing the human hand 300.

It should be noted that: the above embodiments are particularly useful in cases where the injection time is long and the injection flow rate is small.

In a preferred embodiment of the present invention, an end cap 67 is provided at a second end of the cylinder 61 opposite the slide chamber 62, and the end cap 67 is capable of being twisted. The force application mechanism comprises a first magnetic ring 671 and a second magnetic ring 672, the first magnetic ring 671 is arranged on the end cover 67, and the second magnetic ring 672 is arranged on the sliding body 63; the first magnetic ring 671 and the second magnetic ring 672 are formed by abutting two magnets, and the two magnets of the first magnetic ring 671 and the two magnets of the second magnetic ring 672 are different in polarity facing the same direction. And the torsion angle state of the first magnetic ring 671 is set to a state that the first magnetic ring 671 and the second magnetic ring 672 generate mutual repulsion.

As described above, the repulsive force between the first magnetic ring 671 and the second magnetic ring 672 can be changed by rotating the end cap 67, so that the flow rate of the liquid medicine flowing out of the liquid outlet head 51 can be adjusted. Has the advantages that: when the flow rate needs to be reduced, the repulsive force between the first magnetic ring 671 and the second magnetic ring 672 is increased by rotating the end cover 67, so that the flow rate is reduced; when the flow rate needs to be increased, the repulsive force between the first magnetic ring 671 and the second magnetic ring 672 is reduced by rotating the end cover 67, so that the flow rate is adjusted up.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims

1. A medical care injector, comprising:

a cylinder body, both ends of which are open;

the piston is arranged in the cylinder and can slide along the axial direction of the cylinder;

a flow restriction assembly coupled to a front end of the cylinder;

when the piston is pushed against the liquid medicine in the cylinder under the action of the push rod so that the liquid medicine flows through the flow limiting assembly and flows out of the liquid outlet head of the end body, the flow limiting assembly limits the flow of the liquid medicine;

the current limiting assembly includes:

the sliding cavity is arranged in the column body;

the action channel is arranged on the column body and communicated with the liquid outlet channel, and the action channel is used for guiding the liquid in the liquid outlet channel to push the sliding body towards the direction which enables the opening end of the port to be reduced.

2. The medical nursing injector of claim 1, wherein the end body comprises a disk-shaped body, the liquid outlet head is integrally formed on an outer disk surface of the disk-shaped body, a sunken groove is formed on an inner disk surface of the disk-shaped body, and an inner pore channel of the liquid outlet head penetrates through to a groove bottom of the sunken groove, wherein:

3. The medical nursing injector as claimed in claim 1, wherein a suction channel is further opened on the column body, the suction channel penetrates through two ends of the column body for communicating the cylinder body with the liquid outlet head, the flow limiting assembly further comprises a first one-way valve and a second one-way valve; wherein

4. The medical care injector as claimed in claim 2, wherein the first end of the cylinder is formed with a first coupling shoulder which is detachably and sealingly coupled to the front end of the cylinder, and the inner disk surface of the disk-shaped body is formed with a second coupling shoulder which is detachably and sealingly coupled to the second end of the cylinder; wherein:

5. A medical care injector as defined in claim 1, wherein a spring is disposed within the barrel between the plunger and the rearward end of the barrel to enable the spring to force the plunger toward the forward end of the barrel.