Aspiration syringe

Abstract

The invention relates to the field of medical equipment, more specifically to syringes, and can be used for procedures of aspiration of various fluids, for fine needle biopsy, for puncture morphological diagnostics, and for injections of liquid medicinal products. The subject matter of the invention: the disclosed device, including a barrel with a tip for attaching a needle at one end, a piston with a stem slidingly mounted inside the barrel, and a grip at the end of the stem, according to the invention, is provided with a handle moveably coupled to the stem grip and rotatable in relation to a hinge unit located on the stem grip, wherein the handle is at least formed as a bracket with a reverse grip located at the end opposite to the handle attachment and having a slot arranged in the middle portion and intended for enclosing the stem on two sides.

Claims

1. An aspiration syringe comprising: a barrel with a tip for attaching a needle; a piston having a stem, the stem being slidably mounted inside the barrel; and a stem grip located at an end of the stem, wherein the syringe is provided with a handle moveably attached to the stem grip and rotatable in relation to a hinge unit located at the stem grip, wherein the handle is formed at least as a bracket with a reverse grip located at an end opposite to the handle attaching point, the handle further has a slot arranged in a middle portion of the bracket and configured to enclose the stem from two sides.

2. The syringe according to claim 1, wherein the stem grip is formed as an elongated pad extending asymmetrically in relation to an axis of symmetry of the stem, wherein the hinge unit is located on a bottom surface of the stem grip.

3. The syringe according to claim 1, wherein the bracket has an arched shape, wherein a radius of curvature of the bracket approximately equals a distance the piston exits the barrel in operation.

4. The syringe according to claim 3, wherein the slot in the bracket is formed along an entire length of the bracket, and a width of the slot corresponds to a diameter of the stem.

5. The syringe according to claim 1, wherein the handle is provided with an auxiliary bracket located on a bottom surface of the reverse grip.

6. The syringe according to claim 5, wherein the auxiliary bracket is formed as at least one arched element having a slot arranged in the middle portion of the auxiliary bracket and configured to enclose the barrel.

7. The syringe according to claim 5, wherein the auxiliary bracket is provided with a tab located at an end opposite to the reverse grip.

8. The syringe according to claim 6, wherein a width of the slot in the auxiliary bracket corresponds to an outer diameter of the barrel.

9. The syringe according to claim 7, wherein the auxiliary bracket is formed as two arched elements, the elements being coupled to each other and having different diameters, wherein the slot of the auxiliary bracket is formed only in the element of the bracket adjacent to the tab.

10. The syringe according to claim 9, wherein the two arched elements of the auxiliary bracket and the tab are formed so as to correspond to a plurality of fingers.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is illustrated in the drawings, in which

(2) FIG. 1 shows a general view of a syringe before an aspiration begins;

(3) FIG. 2 shows a syringe handle;

(4) FIG. 3 shows a general view of the device in the process of performing aspiration;

(5) FIG. 4 shows a general view of the device with the handle maximally withdrawn.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(6) The disclosed aspiration syringe (FIG. 1) has a barrel 1 with a tip 2 for mounting a needle at one end thereof and a flange 3 at the other end thereof. A piston 4 with a stem 5 is slidably mounted inside the barrel 1, and there is a finger grip 6 on its end configured to be engaged (pressed) in case of injecting medicinal substances into a patient's body.

(7) The barrel 1 is made of polypropylene and has a stop ring (a fixing mechanism) 7 on its inner surface closer to the flange 3 to prevent the piston 4 from inadvertently slipping out of the barrel 1. A scale (not shown) that allows measuring the medical substance when making an injection or determining the volume of fluid withdrawn from the body during the procedure of aspiration (puncture), can be applied on the outer surface of the barrel 1 via engraving or with indelible paint.

(8) The syringe piston 4 is made of high-density polyethylene, and its stem 5 is formed of four longitudinal ribs forming a X-shaped cross-section, which allows minimizing friction of the piston against the barrel 1 walls and keeping a symmetrical position in relation to the walls and the rigidity of the stem 5 at the same time.

(9) The grip 6 mounted at the end of the stem 5 of the piston 4 can be flat or have a slightly concave shape for convenience of placing a doctor's or a nurse's thumb thereon when injecting a medical substance (injection). In contrast to the known analogues, the grip 6 is slightly elongated in one direction in relation to the axis of symmetry of the syringe stem, forming a protrusion having a hinge unit 8 on its bottom surface on that side, the moveable handle 9 actuated by the operator's operational thumb and the stem 5 being connected through the hinge unit.

(10) The main element of the handle 9 (FIG. 2) is a bracket 10 formed as a segment of a circle and having a reverse grip 11 on an end thereof and a slot 12 arranged in the middle portion and intended for enclosing the stem 5 from two sides when it is moved upward (when performing aspiration). The arched shape of the bracket 10 allows increasing the stroke of the piston with a minimal operator's effort and at the same time shortens the distance from the grip 6 of the stem 5 to the reverse grip 11 of the bracket 10, consequently facilitating operator's access to the handle 9 engagement spot and eliminating the need to move the finger for a long distance. Experiments proved that the curvature radius of the bracket 10 approximately equals the distance the piston 4 exits the barrel 1 in operation before it rests on the stop ring 7.

(11) The width of the slot 12 in the bracket 10 of the handle 9 should correspond to (be slightly greater than) the diameter of the piston stem 5. Similarly to the barrel 1 of the syringe, the handle 9 is also made of polypropylene.

(12) In an embodiment of the device, in order to maximize the exit of fluid being withdrawn, the handle 9 can be provided with an auxiliary bracket 13 extending from the bottom surface of the reverse grip 11, and can be formed as at least one arched element having a tab 14 on its end and a slot 15 arranged in the middle portion and intended for enclosing the barrel 1 from two sides when the stem 5 is moved upward (when performing aspiration). Accordingly, the width of the slot 15 in the bracket 13 of the handle 9 should correspond to or be slightly greater than the outer diameter of the barrel 1.

(13) In an optimal embodiment, the auxiliary bracket 13 is formed as two arched elements of different diameters coupled to each other, wherein the slot 15 is formed only in the second bracket 13 element adjacent to the tab 14. By alternatively pressing the elements of the auxiliary bracket 13 of the handle 9 with a finger, the piston 4 can be additionally extended in a step-wise manner. When the force is applied to the tab 14 the piston 4 moves to the topmost position exiting the barrel 1 for the maximum length of the stem.

(14) Moreover, the concave elements of the auxiliary bracket 13 and the tab 14 are sized so as to correspond to the fingers providing for additional convenience of using the syringe and improving the effectiveness of its handling. In addition, by actuating the reverse grip 11 of the handle 9, the elements of the auxiliary bracket 13, and the tab 14 in a step-wise manner, the material being withdrawn can be measured.

(15) The device operates as follows.

(16) After inserting the needle in the required area of the patient's body, a medical worker actuates the handle 9 with a movement of the thumb of the operating hand. The thumb engages the handle 9 (FIG. 3) and moves the reverse grip 11 toward the barrel 1 of the syringe, and while turning in it's the point it is attached to the grip 6 around the axis of the hinge unit 8 the bracket 10 engages the piston 5, which results in the piston 5 smoothly sliding out of the barrel 1, which in turn creates negative pressure in the barrel 1 of the syringe. Meanwhile, when engaging the handle 9, the operator moves the thumb toward the center of the palm clenching the hand, instead of retracting the thumb, which considerably lowers the load on the thumb joint and improves the operator's work comfort and productivity. With that, the rest of the fingers of the operating hand reliably hold the syringe to lower the risk of undesired movement of the needle and, thus, traumatizing the patient.

(17) When the fingers are maximally clenched, the handle 9 abuts the barrel 1 of the syringe and the piston 5 moves to the top position creating negative pressure in the syringe, and aspiration is performed in the required volume. Since the position of the handle 9 is always controlled by the operator, aspiration stops when the pressure is taken off.

(18) This syringe construction is particularly applicable to a syringe of small size, when the handle 9 is rather short and there is enough space for one finger.

(19) In case of using a larger syringe (more than 10 ml) in order to ensure maximum movement of the arched bracket 10 and maximum displacement of the piston toward the topmost position while maintaining comfortable physiological grasp of the barrel and handle, the handle 9 with the auxiliary bracket 13 is used, the auxiliary bracket is formed with one or two concave (arched) elements and the tab 14, which are rests for the index, middle, and ring fingers (FIG. 4). Meanwhile, the barrel 1 enters the slot 15 of the bracket 13, and the tab 14 abuts the outer surface of the barrel 1.

(20) When it is necessary to make an injection, one can move the fingers into a standard position and inject fluid by pressing the stem grip 6 with a thumb.

(21) The disclosed device is convenient to use, ergonomic, lowers the load on the operator's hand and enhances productivity. The device is applicable in fields such as fine needle aspiration biopsy of various organs for the purpose of cytological diagnosis (all organs: liver, prostate gland, thyroid gland, mammary gland, and so on), aspiration of biomaterial (removing fluid: ascites, pleuritis, hemothorax, post operational seromas, hematomas at various sites, pus pockets, etc.), blood sampling, syringe liposuction, irrigation by medical substances (sinus infection, mastitis, abscessus, sclerotherapy of cysts at various sites, etc.), active (aspirational) wound drainage.

(22) Furthermore, in addition to medical application, the disclosed device can be used in any other industry, such as chemical, food, and the like, and also in household for measured withdrawal of liquid preparations, especially if there is a measurement scale applied on the outer surface of the device.