JPS6314859Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hypodermic needle, and more particularly, the present invention includes a cartridge having a needle mount with a hypodermic needle attached thereto, and a needle protection cap that is removably engaged with the needle mount at one end and is placed over the hypodermic needle to protect the needle. The cap has a main part and a thicker part at the end facing the needle mount.

A syringe of the above-mentioned type is disclosed, for example, in Dutch patent no.
133649.

The thicker portion of the needle protection cap is clamped to the sleeve of the needle mount to protect the needle inside and provide a sterile seal. When using a syringe, sterility of the needle is essential.

A disadvantage of known syringes is that the user cannot ensure the sterility of the needle. That is, it cannot be ascertained whether the needle protection cap was removed before it entered the user's hands or whether the needle protection cap became loose during transportation. Therefore, there is no guarantee that the needles used are sterile.

The object of the present invention is to provide a syringe which does not suffer from the above-mentioned drawbacks and allows the user to immediately check whether the needle protection cap has been removed before using the syringe.

To achieve the above-mentioned object, the syringe according to the invention is characterized in that, in the above-mentioned type, the needle protection cap is prevented from falling off unintentionally by a safety member, the safety member having a central hole through which The safety member is provided with a break for receiving the needle protection cap therein and removably and irreversibly coupling said safety member to a cartridge or cartridge holder, the minimum diameter of said central hole being defined by the main diameter of said needle protection cap. The dimension between the diameter of the rupture part and the diameter of the thick part is such that the safety member can naturally fall off from the needle protection cap after breaking the rupture part.

The needle protection cap of the syringe according to the invention cannot be removed without removing the safety member. To remove the safety member, rotate it relative to the cartridge or pull it. This causes the break between the safety member and the cartridge or cartridge holder to break. The safety member is removed along with the needle protection cap and the needle protection cap is now removable.

Since the broken part of the syringe according to the present invention is not broken, it can be confirmed that the needle part is sterile.

The safety member can be of various types. For example, the cylindrical member may have a central hole at one end to engage the thicker portion of the needle protection cap, and a break at the other end. The break may be, for example, a plurality of strips, the free end of which is fixed to the cartridge or cartridge holder.

An embodiment of the safety member is a cap with an open bottom end, a broken part at the open end, a central hole at the top,
The diameter of the hole is midway between the diameters of the main portion and the thicker portion of the needle protection cap.

The embodiments described above also provide protection for the connection between the needle protection cap and the needle mount, since the thicker portion of the needle protection cap is covered by the safety member.

According to another embodiment, the outer diameter of the open end of the cap-like cylindrical member of the safety member is approximately equal to the outer diameter of the opposing portion of the cartridge holder, the break is a notch, a strip, a wire, etc., and the free end Attach the cartridge to the cartridge holder.

In the embodiments described above, the safety member outer diameter is approximately equal to the cartridge holder outer diameter, so that the safety member can be considered an extension of the holder. This makes it less likely that the breakage portion will break due to external forces during transportation.

Embodiments and drawings illustrating the present invention will be described.

Syringe barrel 2 of the syringe cartridge 1 shown in FIG.
An injection solution 5 is put between the stop member 3 and the plunger 4 at the front end. The front end of the syringe barrel forms a neck 6 with a flange 7 . The needle mount 8 is clamped by a flange portion 9, a flange 11 of the stop member, and a flange 9 of the neck portion by an aluminum ring 10, with the flange 11 of the stop member superimposed and the flange 9 of the neck portion. An injection needle 13 with beveled ends is mounted in a cylindrical sleeve 12 formed at the front end of the needle mount 8. The needle protection cap 14 is placed over the needle 13 and the thickened portion 15 is placed over the sleeve 12. The needle protection cap 14 is covered with a safety member 16 according to the invention. The safety member 16 is made of transparent synthetic resin or the like, and has the shape of a cap 17 with an open bottom end.
It is approximately cylindrical in shape and has a hole 19 in the top 18. The main part of the needle protection cap projects through the hole 19 and defines the diameter of the hole 19 such that the safety member 16 contacts the end face of the thickened portion 15. ．． Top part 18 of the safety member
The inner surface of the thick portion 15 substantially contacts the upper end surface of the thick portion 15.
A break 20 is formed at the lower end of the cylindrical cap 17. The break 20 is a thin synthetic resin or a plurality of synthetic resin strips, the lower end of which is fixed to the ring 10 of the cartridge.

In the syringe shown in FIG. 2, each part of the cartridge designated by reference numerals 1 to 15 is the same as that in FIG. This cartridge 1 is attached to the cartridge holder 2 shown in Fig. 2.
Contained within 1. The holder 21 has a hollow cylinder 22 and a laterally projecting bottom 23 . Cylinder 22
The front end of the cartridge 1 forms a small diameter section 24, the inner diameter of which is slightly larger than the outer diameter of the ring 10 of the cartridge 1. In order to lock the cartridge 1 inside the holder 21, a cam 25 is provided on the inner surface of the holder 21 and engages with the lower surface of the flange 7 of the neck 6 of the tube 2.

A safety member 26 is engaged on the outside of the needle protection cap 14. The safety member 26 is made of transparent synthetic resin or the like, and is engaged with the needle protection cap 14 as a cap 27 with an open bottom end. The cap 27 is generally conical and has a central hole 29 in its top 28. The inner diameter of the central hole 29 is larger than the main portion of the needle protection cap 14 and smaller than the outer diameter of the thickened portion 15. The lower surface of the top portion 28 substantially contacts the end surface of the thick portion 15. A break 30 is provided at the lower end of the cap 27 of the safety member. The broken part 30 is made of a thin transparent synthetic resin, and the free end is fixed to the top of the holder 21. The diameter of the bottom of the cap 27 is approximately equal to the diameter of the top of the holder 21. The broken portion can be formed by a weak portion of the cap 27, a large number of strips or thin wires, or the like. When using the syringe of the present invention, first make sure that the broken parts 20 and 30 are not broken. This ensures that sterility is not compromised. Next, safety member 1
6 and 26 by hand to break the breakage parts 20 and 30, and remove the safety members 16 and 26. The syringe is now ready for use. To perform an injection, the plunger is pushed forward with the aid of a plunger rod (not shown). Then, the pressure applied to the injection solution 5 causes the center portion 31 of the stopper member 3 to swell. When the pressure is of sufficient magnitude, the central portion ruptures on its own or against the beveled lower end of the needle 13. The needle protection cap 14 is then removed, forcing out the air and then inserting the needle into the patient's body. plunger 4
When pressed further, the liquid 5 passes through the needle 13 and enters the patient's body.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of a syringe with a safety member according to the present invention. DESCRIPTION OF SYMBOLS 1... Cartridge, 2... Syringe barrel, 3... Stopping member, 4... Plunger, 5... Injection liquid, 6...
...Neck, 7,9,11...Flange, 8...Needle mount, 12...Sleeve, 13...Needle, 14...
...Needle protection cap, 15...Thick part, 16,2
6... Safety member, 19, 29... Hole, 20, 30
...Broken part, 21 ... Cartridge holder, 2
5...Cam section.

Claims (1)

[Scope of utility model registration request] A cartridge having a needle mount with a needle attached thereto, and a needle protection cap that removably engages the needle mount at one end and covers the needle, the needle protection cap having a main portion and a thicker portion at the end facing the needle mount. In the syringe, the safety member prevents the needle protection cap from falling off unintentionally, the safety member has a central hole through which the needle protection cap is inserted, and the safety member the safety member is provided with a break that removably and irreversibly connects the needle to the cartridge or cartridge holder, and the minimum diameter of said central hole is the dimension between the diameter of the main portion and the diameter of the thicker portion of the needle protection cap. A syringe characterized in that the safety member is configured to naturally fall off from the needle protection cap after the breakage portion is broken.