CN115779195A - Single-hand reciprocating syringe - Google Patents

Abstract

The single-hand reciprocating syringe includes outer cylinder, push rod and piston part; a plunger assembly consisting of a push rod and a piston is arranged in the inner cavity of the outer cylinder, and upward returning sheets at two sides of the push rod penetrate through a gap at the curled edge of the outer cylinder and extend upwards along the outer wall of the outer cylinder; the maximum distance L from the outer cylinder edge curl to the transverse protruding piece at the upper section of the vertical plate of the push rod is greater than the length of the outer cylinder nominal capacity scale; clamping the outer cylinder curled edge by a single-hand index finger and a middle finger, pressing the push rod handle by a thumb, and mutually squeezing to finish single-hand injection; the transverse protruding pieces on the upper sections of the folded plate pieces on the two sides of the push rod are clamped by a single-hand indicating finger and a middle finger, the outer cylinder is pressed by a thumb to be curled, the push rod can move out of the outer cylinder backwards, and the process of extracting liquid medicine or collecting tissue specimens under the operation of a single hand is finished. The invention has the advantages of simple structure, convenient use, one-hand completion of reciprocating operation, simplified operation, reduced labor and improved diagnosis and treatment efficiency.

Description

Single-hand reciprocating syringe

Technical Field

The invention relates to a medical instrument, in particular to a single-hand reciprocating syringe which is used for taking liquid medicine, injecting medicine into tissues or transferring or discharging tissue samples after the tissue samples are taken and needs to be operated in a reciprocating way.

Background

The syringe generally consists of an outer cylinder, a push rod and a piston and is mainly used for extracting liquid medicine for compatibility or (adapting to a syringe needle) for infusing the liquid medicine into human tissues; and are also commonly used in diagnostic procedures for collecting tissue specimens or/and withdrawing body fluids.

Syringes have been used clinically for over a hundred years, and disposable (plastic) syringes have been used for over 70 years. During injection, the curled edge of the outer cylinder is clamped by a middle finger and a pointer finger by one hand, the thumb is mutually extruded on the press hand at the tail end of the push rod, the plunger consisting of the push rod and the piston is pressed towards the inside of the syringe cylinder to move, and the extruded liquid medicine is injected into human tissues through a conical hole at the upper end of the outer cylinder and an injection needle (inner hole) to complete the process of injecting the liquid medicine.

However, two-handed operation is required when drawing the liquid medicine: one hand holds the outer cylinder, the other hand pulls out a plunger piston consisting of a push rod and a piston from the syringe cylinder, and the extracted liquid medicine enters the cylinder by utilizing the negative pressure generated in the syringe cylinder; this operation has formed standard movements and occupational habits of medical personnel over the last century.

In the clinical diagnosis and treatment process, the operation of extracting liquid medicine (tissue fluid and body fluid) by both hands brings many difficulties:

such as: the tissue fluid extraction and discharge of patients with chest and ascites (cirrhosis with ascites and pleurisy exudative pleural effusion) are necessary diagnosis and treatment measures; often need to extract and discharge (body fluid) tens of times repeatedly (still need with great specification syringe), the normal operation of both hands pull push rod plunger and fixed urceolus can influence the fixed of pjncture needle (rock and can influence the needle point position, cause injury or position removal, liquid level contact height changes and causes the extraction difficulty) and to the management of closing in time and opening of drainage tube (every time the extraction finishes to close, will open during the extraction), just need to increase an assistant and assist work.

And the following steps: the liquid medicine diluting and medicine compatibility processes before transfusion both need a large amount of repeated liquid medicine extracting operations, and the needle tip (port) is difficult to be accurately fixed at the lowest position in a liquid medicine container (beneficial to liquid medicine extraction and residue reduction) through double-hand operation; therefore, the medical staff mostly adopts a one-hand operation method: the outer cylinder of the syringe is clamped by a thumb, a pointer and a middle finger of a single hand, and a ring finger and a little finger of the hand are used for pulling a push rod and a piston assembly of the syringe backwards so as to lead the push rod and the piston assembly to move backwards and extract the liquid medicine; the method becomes the operation action which is forced to be taken by medical care personnel in clinic, and clinical application is carried out for decades and is handed down by one generation.

The defects are as follows:

(1) because the pulling force of the ring finger and the little finger on the push rod is insufficient, especially when the middle-sized and large-sized syringes are used in the medicine liquid compatibility process, the frequent operation can increase the fatigue degree of medical personnel and the friction damage chance to the palm soft tissue;

(2) due to the relative movement among the fingers of one hand, the space between the three fingers (thumb, index finger and middle finger) for fixing the outer cylinder and the ring finger and the little finger for pulling the push rod is limited, the liquid medicine extracted each time is limited, the preset capacity of the outer cylinder can be extracted only by repeated extraction of the position for reversely resetting and moving the holding push rod for many times, if the liquid medicine is subjected to concentrated compatibility (the concentrated preparation process of large infusion), the preparation method is often too long in compatibility time, high in labor intensity, repeated operation by one hand for many times, low in efficiency, easy in skin abrasion and capable of causing hand tissue damage.

Due to the restriction of the syringe structure, medical staff carelessly continue to adopt the operation, and suffer from difficulties and injuries in clinical application. Therefore, there is a need for a syringe that can be used with a single hand to facilitate the procedure and improve efficiency.

Disclosure of Invention

In order to solve the defects of the prior injector structure in the application scene and solve the difficulty in operation, the invention provides a single-hand reciprocating injector which has simple structure, safety, reliability and good practicability and is easily accepted by medical care personnel; in order to achieve the purpose, the technical scheme of the invention is as follows: the single-hand reciprocating syringe includes outer cylinder, push rod and piston part; the method is characterized in that: a plunger assembly consisting of a push rod and a piston is arranged in the outer cylinder, and the periphery of the piston is provided with an annular ridge which is in sliding seal with the inner wall of the outer cylinder; two sides of a press handle at the lower end of the push rod are provided with upward turning plates which are parallel to the push rod and symmetrical, and the upper sections of the turning plates at the two sides are respectively provided with a transverse protruding piece which is symmetrical with each other; symmetrical notches are arranged at two sides of the outwards turned edge at the lower end of the outer barrel.

The piston is made of rubber or similar elastic materials; the piston can also be made of the same material as the push rod, and the piston and the push rod are integrated into a whole, so that the upper end of the push rod is in a circular sheet structure, the outer diameter of the push rod is slightly larger than the inner diameter of the outer cylinder, and the push rod is in interference fit with the inner wall of the outer cylinder and is in sliding seal.

The turn-back plates on the two sides of the push rod penetrate through the notches on the two sides of the outer cylinder curling edge and extend upwards along the outer wall of the outer cylinder; the maximum distance L from the outer cylinder edge curl to the transverse protruding piece of the upper section of the turn-back plate piece is greater than the length of the outer cylinder nominal capacity scale; the length of the push rod is greater than the depth of the inner cavity of the outer barrel.

The invention has the following technical characteristics and technical progress:

the invention adds the upward turning plate parallel to the push rod and the transverse protruding piece on the upper section of the upward turning plate on the two sides of the push rod; the push rod can drive the piston to move outwards from the deep part of the outer cylinder through the mutual extrusion action of the transverse protruding piece at the upper section of the single-hand index finger and middle finger clamping plate piece and the outer cylinder curled edge pressed by the thumb, and the generated negative pressure can extract liquid medicine or tissue specimens; then, the middle finger and the indicating finger of one hand clamp the outer cylinder to curl, and the thumb presses the push rod to press the hand, so that the normal injection action is realized, and the injection purpose is completed. The invention has the characteristics of simple structure, complete one-hand operation, convenient use, reliability and practicability, and can reduce the labor intensity and improve the working efficiency.

Drawings

Legend: 1-an outer cylinder; 11-luer on the upper end of the outer barrel; 12-curling the lower end of the outer cylinder; 13-notches symmetrical at two sides of the turned edge;

2-a push rod; 21-a press handle at the lower end of the push rod; 22-piston support at the upper end of the push rod; 23-two sides of the push rod are symmetrically provided with the plates which are turned back upwards in parallel; 24-transverse tabs located on the upper section of the plate; 25-a circular sheet structure located at the upper end of the push rod;

3-a piston; 31-an annular ridge located on the periphery of the piston;

FIG. 1 is an exploded view of the single-handed reciprocating-use syringe of the present invention;

FIG. 2 is a schematic view of the plunger of the first embodiment of the single-handed reciprocating syringe of the present invention;

FIG. 3 is a schematic view of the plunger of a second embodiment of the single-handed reciprocating syringe of the present invention;

FIG. 4 is a schematic view showing the overall structure of a first embodiment of the syringe of the present invention for one-handed reciprocal use;

FIG. 5 is a schematic view showing the overall structure of a second embodiment of the single-handed reciprocal syringe of this invention;

fig. 6 is a schematic view showing an exemplary appearance of the syringe of the one-hand reciprocating use type according to the present invention.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

As can be seen from FIG. 1, the syringe of the present invention, which is of one-handed reciprocating use type, comprises an outer cylinder 1, a push rod 2 and a piston 3; the following can be understood by combining the attached drawings 2 and 4: the piston 3 is sleeved on the outer surface of a piston bracket 22 at the upper end of the push rod 2 and then is arranged in the cavity of the outer cylinder 1; a plurality of annular ridges 31 are arranged on the periphery of the piston 3 to form sliding seal with the inner wall of the outer cylinder 1; the length of the push rod 2 is larger than the depth of the inner cavity of the outer cylinder 1; the piston 3 is usually made of rubber or the like elastically.

Referring to fig. 2, a circular piston support 22 is arranged at the upper end of the push rod 2, the upper end of the support can be embedded into the inner cavity of the piston 3, and the outer diameter of the lower end of the support is slightly smaller than the inner diameter of the outer cylinder 1 and is used for supporting the piston 3; the length of the push rod 2 is larger than the depth of the inner cavity of the outer cylinder 1.

A flat press handle 21 is arranged at the lower end of the push rod 2, and the press handle 21 and the piston bracket 22 are connected by a cross or parallel plate-shaped bracket; two symmetrical upward-turning plate sheets 23 extending parallel to the push rod are arranged at two sides of the push rod 2, and the side surfaces of the plate sheets can be provided with reinforcing ribs with the length equal to or less than that of the push rod; in the upper section of the two plates 23 there is a transverse tab 24, each of which is symmetrical from side to side.

As can be seen from fig. 1, the outer cylinder 1 is a cylindrical hollow structure, and a scale with a nominal volume is printed on the outer surface of the outer cylinder; the upper end of the syringe is provided with a luer 11 for connecting an injection needle, the lower end of the syringe is provided with an outward turned bead 12, and two sides of the bead are provided with symmetrical notches 13; the depth and width of the notch are adapted to the two return flaps 23 on the outside of the push rod, through which they can pass.

Referring to fig. 4 and 6, a plunger assembly consisting of a push rod 2 and a piston 3 is installed in the inner cavity of the outer cylinder 1, and the return plates 23 on two sides of the push rod 2 penetrate through the notches 13 on two sides of the outer cylinder curl 12 and extend forwards along the outer wall of the outer cylinder; the maximum distance L from the outer cylinder curled edge 12 to the transverse protruding piece 24 of the upper section of the push rod folded sheet 23 is larger than the length of the outer cylinder nominal capacity graduated scale.

A transverse lug 24 for clamping the upper section of the folded plate 23 at the outer side of the push rod 2 by a single finger and a middle finger when extracting the liquid medicine (or extracting the tissue fluid); pressing the curled edge 12 of the outer cylinder with thumb, squeezing each other with force, so that the plunger composed of the push rod 2 and the piston 3 can slide outwards along the inner cavity of the outer cylinder 1 of the syringe, and extracting the liquid medicine by using the negative pressure of the plunger; at the moment, the other hand of the medical staff can conveniently adjust the liquid medicine container or fix the puncture needle, or open or close the drainage tube and the like.

When injecting liquid medicine (or discharging tissue body fluid), the curled edge 12 of the outer cylinder of the injector is clamped by a single-hand indicating finger and a middle finger, the thumb presses the press hand 21 at the lower end of the push rod 2, the push rod 2 and the plunger assembly formed by the piston 3 are pressed to be displaced towards the deep part of the inner cavity of the outer cylinder of the injector 1, and the liquid medicine is injected into the tissue or the tissue body fluid is discharged through a luer (and an injection needle); the other hand can perform related operations (such as massage on the injection part to facilitate the absorption and diffusion of the liquid medicine and relieve pain, or preparation for compression hemostasis, or preparation of a sample container or a test tube for receiving tissue and body fluid samples, etc.).

The operations can be alternately repeated to complete the expected diagnosis and treatment activities.

The invention can simplify the operation, reduce the labor intensity, improve the working efficiency and save assistants in the diagnosis and treatment process; has certain positive effects.

FIG. 3 is a schematic structural view of a putter in accordance with a second embodiment of the present invention; as can be seen, the push rod 2 and the piston 3 can be made into an integral structure by adopting the same material; at this time, the upper end of the push rod 2 is made into a circular sheet structure 25, the outer diameter of which is slightly larger than the inner diameter of the outer cylinder 1, and a good sliding seal is formed with the inner wall of the outer cylinder 1.

FIG. 5 is a schematic structural diagram of a second embodiment of the present invention, in which a push rod 2 is installed in an inner cavity of an outer cylinder 1, and a circular sheet structure 25 at the upper end of the push rod is in interference fit with the inner wall of the outer cylinder 1 to form a sliding seal; a turn-back plate 23 parallel to the push rod 2 penetrates through the notch 13 at the outer cylinder curled edge 12 and extends upwards along the outer side wall of the outer cylinder; the maximum distance L from the curled edge 12 to the transverse protruding piece 24 of the upper section of the parallel plate pieces 23 at two sides of the push rod is larger than the length of the marking capacity graduated scale of the outer cylinder.

FIG. 6 is a schematic view of the outer appearance of a single-handed reciprocal syringe of the present invention; a push rod 2 (a plunger component formed by the push rod and a piston 3) is arranged in the inner cavity of the outer cylinder 1, and return plates 23 on two sides of a push rod press handle 21 penetrate through gaps on two sides of the outer cylinder curling edge and tightly cling to the side wall of the outer cylinder to extend upwards; the upper section of the folded sheet 23 has a transverse projecting piece 24 which can be held between the middle finger and the indicating finger when the liquid medicine is extracted.

The invention has the advantages of simple structure, convenient use, one-hand completion of reciprocating operation, simplified operation, reduced labor and improved diagnosis and treatment efficiency.

The above structure only represents a typical structure of the injector capable of being used with one hand in a reciprocating way, and all types (self-destruction, safety, needle prick prevention, etc.) of injector structure types which can realize the basic functions of the injector (a liquid medicine container and a metering tool) can fall into the protection scope of the invention as long as the return plate structure provided by the invention is adopted in a push rod or a plunger assembly.

Claims (3)

1. The single-hand reciprocating syringe comprises an outer cylinder (1), a push rod (2) and a piston (3); the method is characterized in that: a plunger assembly consisting of a push rod (2) and a piston (3) is arranged in the outer cylinder (1), and an annular ridge (31) is arranged on the periphery of the piston (3) and is in sliding seal with the inner wall of the outer cylinder (1); two sides of a press handle (21) at the lower end of the push rod (2) are provided with symmetrical upward returning plate sheets (23) which are parallel to the push rod (2), and the upper sections of the returning plate sheets at the two sides are respectively provided with a transverse protruding sheet (24) which are mutually symmetrical; symmetrical notches (13) are arranged at two sides of a turned edge (12) which is turned outwards at the lower end of the outer cylinder (1).

2. The single-handed reciprocating syringe of claim 1, wherein: the piston (3) is made of rubber or similar elastic materials; the piston (3) can also be made of the same material as the push rod (2) and is integrated with the push rod (2), so that the upper end of the push rod (2) is in a circular sheet structure (25), the outer diameter of the circular sheet structure is slightly larger than the inner diameter of the outer cylinder (1), and the circular sheet structure is in interference fit with the inner wall of the outer cylinder (1) and is in sliding seal.

3. A single-handed reciprocating syringe as defined in claim 1 wherein: the return plates (23) at two sides of the push rod (2) penetrate through the notches (13) at two sides of the outer cylinder curled edge (12) and extend upwards along the outer wall of the outer cylinder (1); the maximum distance L from the outer cylinder curled edge (12) to the transverse protruding piece (24) at the upper section of the folding back plate piece (23) is larger than the length of the outer cylinder nominal capacity scale; the length of the push rod (2) is larger than the depth of the inner cavity of the outer cylinder (1).

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