CN110559515A

CN110559515A - drug delivery device for anesthetic

Info

Publication number: CN110559515A
Application number: CN201910846074.XA
Authority: CN
Inventors: 李向坤; 贾长新; 杨红娟
Original assignee: Affiliated Hospital of University of Qingdao
Current assignee: Affiliated Hospital of University of Qingdao
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2019-12-13

Abstract

The invention discloses a drug delivery device for anesthetic, comprising: an injection tube; a piston provided in the syringe and slidable in the syringe; a piston rod extending into the syringe and sliding in the syringe by pushing and pulling a tail portion of the piston rod; an injection needle provided at the head of the syringe; a valve element arranged between the injection needle and the injection cylinder, the valve element being adapted to reduce the through-flow cross-section from the injection cylinder into the injection needle with increasing thrust against the piston.

Description

Drug delivery device for anesthetic

Technical Field

The present invention relates to a drug delivery device.

Background

in the prior art, an injector is used as a drug delivery device to inject anesthetic into a position to be operated, and the specific operations are as follows: the needle head of the injector is extended into the human tissue at the corresponding position, and the finger is used for pushing the anesthetic.

The above-mentioned methods of injecting anesthetic agents of the prior art have the following drawbacks:

1. The flow of anesthetic from the needle is not uniform because it is dependent on the amount of force applied by the human hand, e.g., when the pushing force applied by the human hand is not uniform, the flow of anesthetic from the needle is not uniform.

2. the needle has only one outlet so that the anesthetic can only flow out through this outlet, and when the area to be anesthetized is large, multiple and different injections are required.

Disclosure of Invention

in view of the above technical problems in the prior art, embodiments of the present invention provide a drug delivery device for anesthetic.

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

a drug delivery device for an anesthetic, comprising:

An injection tube;

A piston provided in the syringe and slidable in the syringe;

A piston rod extending into the syringe and sliding in the syringe by pushing and pulling a tail portion of the piston rod;

An injection needle provided at the head of the syringe;

A valve element arranged between the injection needle and the injection cylinder, the valve element being adapted to reduce the through-flow cross-section from the injection cylinder into the injection needle with increasing thrust against the piston.

Preferably, the valve member includes:

The valve body is arranged at the head part of the injection cylinder, and the injection needle is connected to the valve body;

The valve cavity is arranged in the valve body;

the first passage is used for communicating the valve cavity with the syringe, and the first passage penetrates through the cavity wall of the valve cavity to form an inlet;

The second passage is used for communicating the valve cavity with the injection needle, and the second passage penetrates through the cavity wall of the valve cavity to form an outlet; wherein:

the valve core is arranged in the valve cavity and can slide in the valve cavity; wherein:

The valve core controls the opening degree of the inlet by moving, so that when the thrust force pushing against the piston is increased, the valve core moves downwards to reduce the opening degree of the inlet.

Preferably, the valve member further comprises a third passage and a spring;

The third channel is connected with the first channel and the valve cavity positioned above the valve core;

The spring is arranged in the valve cavity below the valve core and is in a compressed state.

Preferably, a first blocking head extends into the valve cavity from the upper end of the valve cavity, a protruding portion is formed at the lower end of the first blocking head, and the protruding portion is used for being in contact with the valve core so that one end, located in the valve cavity, of the third channel is in an open state.

preferably, a second blocking head extends into the valve cavity from the lower end of the valve cavity, and the spring is arranged between the second blocking head and the valve core.

preferably, the valve body is disc-shaped, a threaded sleeve is formed on one side of the valve body facing the injection cylinder, and the threaded sleeve is connected to the head of the injection cylinder through a threaded connecting sleeve; wherein:

And a sealing ring is arranged between the screw sleeve and the injection tube.

preferably, a section of the injection needle close to the head of the injection needle is provided with a plurality of holes; the holes are sequentially arranged along the axial direction.

Preferably, a stepped structure is arranged in the middle of the valve core, and the valve core controls the opening degree of the inlet through the stepped structure.

Preferably, the first plugging head is connected in the valve body by screw threads.

preferably, the second plugging head is connected to the valve body by screw threads.

compared with the prior art, the administration device for the anesthetic disclosed by the invention has the beneficial effects that: the administration device of the invention can avoid the situation that the anesthetic flowing out of the injection needle is suddenly increased when the pressure of the piston is suddenly increased by changing the through-flow section (or opening) allowing the anesthetic to pass, thereby improving the uniformity of administration to a certain extent.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

the summary of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the full scope or all features of the disclosed technology.

Drawings

In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments, by way of example and not by way of limitation, and together with the description and claims, serve to explain the inventive embodiments. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

Fig. 1 is a schematic structural diagram of a drug delivery device for anesthetic provided by an embodiment of the present invention (the piston is uniformly stressed and within a predetermined range).

Fig. 2 is an enlarged view of a portion a of fig. 1.

Fig. 3 is a schematic structural diagram of a drug delivery device for anesthetic provided by an embodiment of the present invention (when the piston is suddenly forced up).

Fig. 4 is an enlarged view of a portion B of fig. 3.

Reference numerals:

10-an injection cylinder; 20-a piston; 30-a piston rod; 40-injection needle; 41-holes; 50-a valve element; 51-a valve body; 511-valve cavity; 512-thread insert; 52-a valve core; 521-a ladder structure; 53-first channel; 531-import; 54-a second channel; 541-an outlet; 55-a spring; 56-first plugging head; 561-a projection; 57-a second plugging head; 58-third channel.

Detailed Description

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.

As shown in fig. 1 to 4, the disclosed embodiment of the present invention discloses a drug delivery device for an anesthetic agent, which is used to inject the anesthetic agent. The drug delivery device comprises: syringe 10, piston 20, piston rod 30, injection needle 40, valve element 50.

The piston 20 is disposed in the syringe 10, the head of the piston rod 30 extends into the syringe 10 and is connected to the piston 20, the tail of the piston rod 30 is located outside the tail of the syringe 10, and the piston 20 can slide along the axial direction of the syringe 10 by pushing and pulling the piston rod 30 to perform anesthetic sucking operation and anesthetic injecting operation. Specifically, the piston rod 30 is biased by a human hand to slide the piston 20.

An injection needle 40 is disposed at the head of the syringe 10, and the injection needle 40 is used to penetrate the site to be anesthetized to inject the anesthetic into the subcutaneous tissue by the pushing of the plunger 20.

As shown in fig. 2 and 4, the valve element 50 is disposed between the injection needle 40 and the syringe barrel 10 such that anesthetic can enter the injection needle 40 through the back of the valve element 50. The valve element 50 includes: the valve comprises a valve body 51, a valve core 52, a valve cavity 511, a first passage 53, a second passage 54, a third passage 58, a spring 541, a first blocking head 56 and a second blocking head 57.

the valve body 51 is substantially disc-shaped to match the cross section of the syringe 10, and the valve cavity 511 radially penetrates the valve body 51 to enable the valve core 52 to enter the valve cavity 511; the valve core 52 is located in the valve chamber 511 and is slidable along the valve chamber 511. The first passage 53 is a straight passage, the first passage 53 communicates the valve cavity 511 with the syringe 10, and the first passage 53 penetrates through the cavity wall of the valve cavity 511 to form an inlet 531; the second passage 54 is a straight passage, the second passage 54 communicates the valve chamber 511 with the injection needle 40, and the second passage 54 penetrates the cavity wall of the valve chamber 511 to form an outlet 541; the third passage 58 communicates the first passage 53 with the valve chamber 511 above the valve spool 52, which enables the liquid medicine to enter the valve chamber 511 above the valve spool 52 through the first passage 53 and the third passage 58.

the first blocking head 56 extends into the valve cavity 511 from the upper end of the valve cavity 511 to be located above the valve core 52, the lower end of the first blocking head 56 is provided with a protruding part 561, and the protruding part 561 is used for contacting with the upper end face of the valve core 52 to enable one end, located in the valve cavity 511, of the third passage 58 to be always in an open state.

a stepped structure 521 is provided in the middle of the valve core 52, the stepped structure 521 is obtained by machining a shoulder on the cylindrical valve core 52, and the position of the shoulder of the stepped structure 521 is used for controlling the opening degree of the inlet 531: when the valve core 52 moves down, the shoulder increases the amount of shielding of the inlet 531 so that the opening degree of the inlet 531 decreases, and when the valve core 52 moves up, the shoulder decreases the amount of shielding of the inlet 531 so that the opening degree of the inlet 531 increases.

The second blocking head 57 extends into the valve cavity 511 from the lower end of the valve cavity 511 to be located below the valve core 52, and the spring 541 is disposed in the valve cavity 511 and between the valve core 52 and the second blocking head 57, so that the spring 541 is in a compressed state, and the spring 541 always has a certain upward elastic force on the valve core 52, which enables the valve core 52 to be located at an upper position where the first blocking head 56 is contacted.

The working principle of the drug delivery device of the present invention is described below.

When it is necessary to suck anesthetic, the needle is extended into the anesthetic container, and the piston rod 30 is pulled by applying force, so that anesthetic enters the valve cavity 511 through the second passage 54, enters the first passage 53 through the inlet 531 by the clearance between the cylinder body between the two shoulders and the valve cavity 511, and enters the syringe 10 after flowing through the first passage 53.

When it is desired to inject anesthetic into a desired location, the needle penetrates the tissue at the corresponding location, the force is applied to push the piston rod 30, and the piston 20 applies pressure to the anesthetic in the syringe barrel 10 such that the anesthetic enters the injection needle 40 through the first and second channels 53 and 54 and is injected into the tissue through the injection needle 40.

it should be noted that: anesthetic can enter the valve chamber 511 above the valve element 52 through the third passage 58, that is, the valve chamber 511 above the valve element 52 contains anesthetic, and the pressure of the anesthetic is approximately equal to the pressure in the syringe 10.

as shown in fig. 2, during the injection, if the force is uniformly applied within a predetermined range, the elastic force of the spring 541 is greater than the pressure of the anesthetic at the upper end of the valve core 52, so that the valve core 52 is located at the upper position, at this time, the shielding amount of the shaft shoulder (or step structure 521) to the inlet 531 is the smallest, and the opening degree of the inlet 531 is the largest.

As shown in fig. 4, when the biasing force is larger than the predetermined range, the pressure of the anesthetic in the syringe 10 increases, and accordingly, the pressure of the anesthetic above the valve element 52 also increases, and the valve element 52 moves down against the elastic force of the spring 541, and the amount of shielding the inlet 531 increases, so that the opening degree of the inlet 531 decreases.

According to the principles of fluidics, the flow cross-section (for example, the opening of the inlet 531 is such as to allow the passage of the anesthetic agent) is inversely proportional to the pressure of the fluid when the flow rate of the fluid is constant. That is, the present invention keeps the flow rate of anesthetic flowing into the injection needle 40 substantially constant or avoids a sudden increase in the flow rate by reducing the degree of opening of the inlet 531 when the pressure of anesthetic increases.

The administration device of the present invention can prevent the anesthetic from suddenly increasing flowing out from the injection needle 40 when the pressure of the piston 20 suddenly increases by changing the through-flow section (or opening) allowing the anesthetic to pass through, thereby improving the uniformity of administration to a certain extent.

In some preferred embodiments, the valve body 51 is disc-shaped, a threaded sleeve 512 is formed on one side of the valve body 51 facing the syringe 10, and the threaded sleeve 512 is connected to the head of the syringe 10 through a threaded connection sleeve; wherein: a sealing ring is arranged between the screw sleeve 512 and the syringe 10.

In some preferred embodiments, a section of the injection needle 40 near its head is provided with a plurality of holes 41; the plurality of holes 41 are arranged in order in the axial direction. Thus, after the injection needle 40 is inserted into the tissue, the anesthetic can flow out through the plurality of holes 41 at the same time, thereby increasing the anesthetic area obtained by performing one injection.

moreover, although exemplary embodiments have been described herein, the scope of the present invention includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.

The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the above-described embodiments, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, inventive subject matter may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

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 drug delivery device for an anesthetic, comprising:

An injection tube;

a piston provided in the syringe and slidable in the syringe;

An injection needle provided at the head of the syringe;

2. The administration device for anesthetic agents according to claim 1, characterized in that the valve member comprises:

The valve cavity is arranged in the valve body;

3. the administration device for anesthetic agents as claimed in claim 2, characterized in that the valve member further comprises a third channel and a spring;

4. the administration device for anesthetic according to claim 3, characterized in that a first blocking head extends into the valve chamber from the upper end of the valve chamber, and a protrusion is formed at the lower end of the first blocking head, and the protrusion is used for contacting with the valve core to make one end of the third channel located in the valve chamber in an open state.

5. The delivery device of claim 3, wherein a second plug extends into the valve chamber from a lower end of the valve chamber, and the spring is interposed between the second plug and the valve core.

6. the administration device for anesthetics according to claim 1, wherein the valve body is disc-shaped, a threaded sleeve is formed on one side of the valve body facing the syringe, and the threaded sleeve is arranged on the head of the syringe through a threaded connection sleeve; wherein:

And a sealing ring is arranged between the screw sleeve and the injection tube.

7. The administration device for anesthetics of claim 1 wherein said needle defines a plurality of holes adjacent a head portion thereof; the holes are sequentially arranged along the axial direction.

8. the administration device for anesthetic agents according to claim 2, characterized in that the valve core is provided with a stepped structure at its middle portion, and the valve core controls the opening degree of the inlet port by the stepped structure.

9. The delivery device for anesthetic agents as claimed in claim 4, characterized in that the first stopper head is connected in the valve body by means of a screw thread.

10. the delivery device for anesthetic agents as claimed in claim 6, characterized in that the second stopper head is screwed into the valve body.