RU51878U1 - SAFETY ACCURATE SYRINGE WITH RETAINED NEEDLE HOLDER - Google Patents

Abstract

A safe hypodermic syringe is provided with a retractable needle holder. The syringe contains a housing, a piston, a needle holder and a needle cap. On the outer surface of the needle holder and on the inner surface of the housing, several engagement elements are provided, wherein the engagement elements of the needle holder can come into contact with the engagement elements of the housing, so that the needle holder is firmly held at the distal end of the housing. Several positioning elements are provided on the inside of the needle holder, and the distal end of the piston is also provided with several positioning elements, and the positioning elements of the needle holder can come into contact with the positioning elements of the piston, which makes it possible to connect the needle holder with the piston. The breaking element and the piston neck allow the user to break the piston into pieces. Thus, the user first uses the piston to install the needle holder in its place, injects it, pulls the piston back to retract the needle holder, which is held inside the case, as a result of which direct contact of someone with the hypodermic needle is prevented.

Description

The technical field to which the utility model relates.

The present utility model relates generally to a safe syringe, in particular to a safe hypodermic syringe (hypodermic syringe), in which the needle holder is retracted into the syringe tube and the piston may be broken after use.

State of the art

Currently, when conducting medical procedures, the greatest attention is paid to safety issues, to the provision of which advanced technologies in the field of medicine are directed. The use of medical devices, especially invasive devices, an ill-conceived design can cause serious illness for patients. For example, the design flaws of hypodermic syringes lead to irreparable misfortunes.

To ensure the high quality of medical procedures, efforts should be concentrated, in addition to the development of technology for conducting procedures, on the improvement of medical devices. Regarding hypodermic syringes, the most important preventive measures are currently being taken to prevent reuse of syringes and unwanted direct contact with the needle. To prevent reuse, all syringes must be brought to a non-functional state, placed in a sealed container or bag, and then burnt as garbage. However, bringing the syringes to this state requires additional work. Thus, employees of many medical institutions or clinics only separate the needles from the tubes, which makes it possible to reuse syringes. In addition, although medical personnel must use gloves while the syringes are in a non-functional state, these gloves can be punctured with a needle that causes the disease.

Thus, safe hypodermic syringes should allow the needle to retract into a safe position after use to prevent unwanted direct contact with the needle when medical personnel attempt to separate the needle from the syringe tube.

Various safety syringes are known in which the needle retracts or closes after use.

US Pat. No. 5,411,487 describes a needle closing mechanism for a hypodermic syringe containing a cylinder for injection fluid and a piston for displacing this fluid from the cylinder. The mechanism includes a protective closing sleeve mounted to move between the retracted position at which the needle is exposed and the extended position at which the needle is closed. In addition, the mechanism comprises a compression screw spring mounted inside the closure sleeve to move it to the extended position, a lock to hold the closure sleeve in the retracted position, and a manual trigger to release the constipation.

WO 9205818 describes a retractable needle syringe in which a spring pushing a needle into a piston is released by pushing the piston into the cylinder after using the syringe.

US Pat. No. 5,049,133 describes a safety syringe with manual needle retraction in which the spring retracting the needle into the syringe body is released by displacing the piston.

Prior art safety syringes with manual retraction of the needle usually have the disadvantage associated with too much force required to release the power element, which makes it difficult to use such a syringe.

The author of this utility model has several patents for previous inventions and utility models, for example RU 45923. The solution disclosed in this patent document can be selected as the closest analogue of the claimed utility model. A well-known safe hypodermic syringe equipped with a retractable needle holder comprises a housing having a space for liquid, a hole being made in the distal surface of the housing, a piston mounted inside the housing, and a groove provided in the piston in which an annular sleeve is installed for sealing the fluid space , the needle holder in which the passage for installing the needle is made. However, this solution has some drawbacks such as a complicated design and a weak connection between the piston and the needle holder. Therefore, the author made every effort to create a useful model in which these shortcomings were eliminated.

Utility Model Disclosure

The objective of this utility model is to create a safe hypodermic needle for safe use,

preventing unwanted contact with the hypodermic needle and meeting environmental requirements.

Another objective of the utility model is to create a safe hypodermic syringe, in which the needle cover can be inserted into the syringe body after use.

The third objective of the utility model is to create a safe hypodermic syringe, which enables the placement of the needle with the needle holder in the space of the syringe body intended for the liquid after its use.

The fourth task of the utility model is to create a safe hypodermic syringe, the piston of which can be moved by the user several times to the left and to the right to break off the piston neck from the rest of it.

To solve the above problems, a safe hypodermic syringe (subcutaneous syringe) according to this utility model comprises a body, a piston, a needle holder and a needle cap. The housing has a liquid space, a positioning space located in the region of the distal end of the liquid space, an opening made in the distal surface of the body, an inclined annular surface in the positioning space, giving the distal part of the body the shape of a truncated cone, and there are many meshing elements, each of which is equipped with one or two inclined guide surfaces. In a preferred embodiment, the inclined guide surface of each engagement element has an arcuate shape. A fracture element is provided at the proximal end of the fluid space. The piston is installed inside the housing and has at its distal end an upper part on which a plurality of positioning elements are provided. Behind the positioning elements in the piston, a groove is made in which an annular sleeve is installed for hermetically sealing the space for the liquid. Behind the annular sleeve is a piston neck that can be broken off from the rest of the piston.

In a preferred embodiment, the engagement elements of the housing are arranged circumferentially at the same distance from each other in the positioning space, and the engagement elements of the needle holder are arranged circumferentially on the outer surface of the needle holder also at an equal distance from each other.

The positioning elements of the piston are located on its upper part, preferably at an equal distance from each other, and the positioning elements of the needle holder are located in the space provided therein also preferably at an equal distance from each other.

The needle holder is located in the positioning space. A passage is made in the needle holder in which the needle is held by adhesive or by friction. Behind the passage there is a space with a plurality of positioning elements in contact with the positioning elements of the piston. The outer surface of the needle holder is provided with a plurality of engagement elements, each of which has one or two inclined guide surfaces, allowing these engagement elements to come into contact with the engagement elements of the housing. The needle holder is equipped with an inclined annular surface for a snug fit on the inclined annular surface of the housing. The needle holder cap has a cylindrical body with a domed tip and can close the needle.

In the process, the user first places the cap on the needle and pushes the piston forward to bring the positioning elements of the needle holder into contact with the positioning elements of the piston. The user then pushes the piston further to pull the needle out of the body through the hole. After that, the user rotates the piston so that the engagement elements of the needle holder come into contact with the engagement elements of the housing. The user can then remove the cap and insert the needle into the container for the drug to extract the drug from it. The user can now inject. Upon completion of the injection, the user can push the piston forward to engage the positioning elements of the needle holder in contact with the positioning elements of the piston. The user then rotates the piston and the needle holder in opposite directions to disconnect the engagement elements of the needle holder and the engagement elements of the housing. After that, the user pulls the piston back into the fluid space until the needle holder stops with a breaking element, the inner diameter of which is slightly smaller than the outer diameter of the needle holder. Now the user can move the piston left and right several times to break off the neck from the rest of the piston. In this case, the ring sleeve remains inside the housing for sealing. In conclusion, the user can insert a cap, the diameter of which slightly exceeds the diameter of the hole, in the specified hole inverted to close it. A safe hypodermic needle is ready for disposal.

List of drawings. Drawings illustrate a preferred embodiment of a utility model, designed to demonstrate its various advantages and tasks. In the drawings:

figure 1 shows an exploded view of a safe syringe in the first exemplary embodiment,

figa depicts in perspective a first embodiment of a piston,

figv depicts in perspective a second embodiment of the piston,

figa depicts in side view the first embodiment of the needle holder,

3B is a sectional view of a first embodiment of a needle holder,

figs depicts in perspective a second embodiment of the needle holder,

3D is a sectional view of a second embodiment of a needle holder,

figure 4 depicts in perspective the engagement of the piston and needle holder,

5 depicts a perspective view of a needle cap located on a needle holder that is connected to a piston inside a syringe tube,

6 depicts a perspective view of the engagement elements (first option) of the needle holder coming into contact with the engagement elements (first option) of the syringe tube,

6A is an enlarged partial view of FIG. 6,

6B is an enlarged partial perspective view showing the engagement elements (second embodiment) of the needle holder coming into contact with the engagement elements (second embodiment) of the syringe tube,

Fig. 6C is a perspective enlarged partial view showing engagement elements (second embodiment) of a needle holder in contact with engagement elements (second embodiment) of a syringe tube,

Fig.7 shows a medicinal product extracted from its intended container and contained in the space for liquid,

on Fig shows the rotation of the piston by the user (the first option) and the needle holder in opposite directions to disconnect the engagement elements of the needle holder and the engagement elements of the syringe tube,

figure 9 in perspective shows a broken piston into parts (the first option), part of which together with the needle holder remained inside the syringe tube.

Utility Model Implementation

Figure 1 shows a safe hypodermic syringe according to the present utility model, comprising a housing 1, a piston 2, a needle holder 3 and a needle cap 4.

The housing 1 comprises a fluid space 11 into which a medicine can be placed. In the region of the distal end of the space 11, a positioning space 12 is provided in which the needle holder 3 is fixedly held. A hole 13 is made in the distal surface of the housing 1 through which a needle 36 extends from the housing 1 and is installed in the needle holder 3. In the positioning space 12, a plurality of elements 14 gears that have the same shape and size and are spaced around the circumference at an equal distance from each other. Each engagement element 14 is provided with one or two inclined guide surfaces 141, FIG. 6B, which engage the elements 14 with the needle holder 3. Alternatively, each engagement element 14 has an arcuate inclined guide surface 142, FIG. 6C. An inclined annular surface 15 is provided, so that the distal part of the housing 1 has the shape of a truncated cone. Behind the fluid space 11 there is a breaking element 16 that can be used to break into a part of the piston 2.

A piston 2 is located outside the housing 1 and is used to displace the medicine from the housing 1. The distal end of the piston 2 is provided with an upper part 21 on which there are a plurality of positioning elements 22, as shown in FIGS. 2A and 2B. The positioning elements 22 have the same shape and size and are located at the same distance from each other to enable the piston to adhere to the needle holder 3, as shown in FIG. 4. A groove is provided in the rear of the positioning elements 22, in which an annular sleeve 23 is mounted. The annular sleeve 23 is made of rubber, silicone resin or other soft rubber material and creates a tight seal of the fluid space 11. Behind the annular sleeve 23 there is a neck 24, which provides breaking of the piston 2, as shown in Fig.9. In this case, the annular sleeve 23 remains in the housing 1.

The needle holder 3 is located in the space 12 of the housing 1. In the needle holder 3, a passage 31 is made, as shown in FIG. 3B, in which the needle 36 is held either by means of adhesive or by friction, as shown in FIG. 3D. During use, the needle can be pulled out of the housing 1 through the hole 13. At the back of the passage 31, a space 32 is provided in which a plurality

positioning elements 33, as shown in figs. The positioning elements 33 have the same shape and size and are located at an equal distance from each other. In use, the positioning elements 33 come into contact with the positioning elements 22 of the piston 2. A plurality of engagement elements 34 are provided on the outer surface of the needle holder 3, as shown in FIG. 3A. The engaging elements 34 have the same shape and size and are located around the circumference of the needle holder 3 at the same distance from each other. Each engagement member 34 has one or two inclined guide surfaces, FIG. 6B, so that the engagement members 34 can come into contact with the piston engagement members 14 in a circular motion.

The cap 4 has a cylindrical shape and is designed to close the needle.

As follows from figure 5, in the process of using a safe hypodermic syringe, the user first places the cap 4 on the needle and pushes the piston 2 forward to bring the positioning elements 33 of the needle holder 3 into contact with the positioning elements 22 of the piston 2. Then the user pushes the piston 2 further to removing the needle 36 from the housing 1 through the hole 13. After that, the user rotates the piston 2, so that the engagement elements 34 of the needle holder 3 come into contact with the engagement elements 14 of the housing 1, as shown in phi 6 and 6A. Since the inclined annular surfaces 15 and 35 are provided in the positioning space 12 and on the outside of the needle holder 3, the needle holder 3 fits snugly in the housing 1, so that there is no gap in the liquid space 11.

The user can then remove the cap 4 and insert the needle 36 into the container (not shown) for the medicament. Subsequently, the user pulls back the piston 2. Since the needle holder 3 is firmly seated in the housing 1, the positioning elements 22 of the piston 2 can easily come out of contact with the positioning elements 33 of the needle holder 3, and the medicine is pulled from the container into the fluid space 11, as shown in FIG. 7. The injection can be performed after filling the space 11 with a medical preparation. Upon completion of the injection, the user can push the piston 2 forward to ensure that the positioning elements 33 of the needle holder 3 are in contact with the positioning elements 22 of the piston 2. Then the user rotates the piston 2 and the needle holder 3 in opposite directions to disconnect the engagement elements 34 of the needle holder 3 and the engagement elements 14 of the housing 1, as shown in Fig. 8. After that, the user pulls the piston back into the space 11 until the needle holder 3 stops with the breaking element 16. Now the user can

move the piston left and right several times to break off the neck 24 from the rest of the piston 2, as shown in Fig.9. In this case, the annular sleeve 23 remains inside the housing 1 for sealing. In conclusion, the user can insert the cap 4 into the opening 13 in an inverted manner to close it, and the safe hypodermic syringe is ready for disposal.

In contrast to the aforementioned previous inventions of the author and similar known devices, the safety hypodermic syringe according to the present utility model has the following advantages.

1. Guiding surfaces are provided on the engagement elements of the housing and the engagement elements of the needle holder, whereby the needle holder is securely held inside the case.

2. The positioning elements of the piston can come into contact with the positioning elements of the needle holder, and the user can rotate the piston and the needle holder in opposite directions to separate the engagement elements of the needle holder and the engagement elements of the housing.

3. The diameter of the needle cap slightly exceeds the diameter of the hole. The user can insert the cap upside down into the opening to close it.

For a specialist in this field it is clear that in the implementation of the utility model, various changes and modifications are possible, not going beyond the scope of protection. The utility model is intended to promote progress in science and practice, and the scope of its protection is defined in the utility model formula.

Claims (15)

1. A safe hypodermic syringe equipped with a retractable needle holder, comprising a housing having a fluid space, a positioning space located in a region of a distal end of the fluid space, an opening being made in a distal surface of the body, and an inclined annular surface provided in the positioning space giving the distal part of the body the shape of a truncated cone, and there are many elements of engagement, each of which is equipped with one or two inclined guiding surfaces; a piston mounted inside the housing and having at its distal end an upper part on which a plurality of positioning elements are provided, wherein a groove is provided behind the positioning elements in the piston, in which an annular sleeve is installed for hermetically sealing the fluid space; and a needle holder located in the positioning space, wherein a passage is made in the needle holder, behind which there is a space with a plurality of positioning elements contacting with the piston positioning elements, the outer surface of the needle holder provided with a plurality of engagement elements, each of which has one or two inclined guide surfaces that allow these engagement elements to come into contact with the engagement elements of the housing, and the needle holder is provided with n inclined annular surface for a snug fit on the inclined annular surface of the housing. 2. The syringe according to claim 1, characterized in that a cap is provided for closing the needle. 3. The syringe according to claim 1, characterized in that each engagement element of the housing has one inclined guide surface. 4. The syringe according to claim 1, characterized in that each engagement element of the housing has two inclined guide surfaces. 5. The syringe according to claim 1, characterized in that the inclined guide surface of each engagement element has an arcuate shape. 6. The syringe according to claim 1, characterized in that the engagement elements of the housing are arranged circumferentially at the same distance from each other in the positioning space. 7. The syringe according to claim 1, characterized in that the positioning elements of the piston are located on its upper part at an equal distance from each other. 8. The syringe according to claim 1, characterized in that the needle is held in the passage using adhesive or due to friction. 9. The syringe according to claim 1, characterized in that the positioning elements of the needle holder are located in the space provided therein at an equal distance from each other. 10. The syringe according to claim 1, characterized in that the engagement elements of the needle holder are located on a circle on the outer surface of the needle holder at an equal distance from each other. 11. The syringe according to claim 1, characterized in that each element of the engagement of the needle holder has one inclined guide surface. 12. The syringe according to claim 1, characterized in that each engagement element of the needle holder has two inclined guide surfaces. 13. The syringe according to claim 1, characterized in that the positioning elements of the piston are made to come into contact with the positioning elements of the needle holder, and the rotation of the piston and the needle holder in opposite directions by the user ensures separation of the engagement elements of the needle holder and the engagement elements of the housing. 14. The syringe according to claim 1, characterized in that a fracturing element is provided at the proximal end of the liquid space, the inner diameter of which is slightly smaller than the outer diameter of the needle holder, as a result of which the piston moves the user several times left and right to break the neck from the rest parts of the piston, while the annular sleeve remains inside the housing for sealing. 15. The syringe according to claim 1, characterized in that the diameter of the cap for the needle slightly exceeds the diameter of the hole, so that the user can insert the cap into the hole inverted to close it.