WO2001036023A2

WO2001036023A2 - A sterile disposable spinal syringe set without mandril

Info

Publication number: WO2001036023A2
Application number: PCT/TR2000/000060
Authority: WO
Inventors: Sami ÖNDER
Original assignee: Oender Sami
Priority date: 1999-11-15
Filing date: 2000-11-14
Publication date: 2001-05-25
Also published as: AU1912601A; WO2001036023A3

Abstract

The disposable, sterile spinal syringe set without mandrin consists of three components, namely; a syringe (6), a dental needle (1) and a normal needle (2). The dental needle (1) may be manufactured with an adapter part (5) made of plastics, in order to facilitate its attachment to the syringe (6). Dental needle (1) is a spinal needle without mandrin. The inner surface of the adapter can be flat, threaded or luer-locked. The main body (3) of the dental needle can be manufactured in various gauges and lengths of a special iron whereas its tip (4) can be made as straight, inclined, with a pin-tip or can be formed obliquely. In an alternative embodiment of using the disposable sterile spinal syringe set without mandrin, a normal needle (3) is not employed whereas the disposable sterile syringe (6) pre-filled with medicament for a single-use and a dental needle (1) which is a spinal needle without mandrin are used as one piece.

Description

A STERILE DISPOSABLE SPINAL SYRINGE SET WITHOUT

MANDRIN

The present invention relates to an injector and needles without mandrin and particularly to a sterile disposable syringe set comprising these components.

Many studies are being conducted in order to reduce the side effects occurring during the application of spinal anaesthesia which is practised since 1884. Some of the said side effects are explained below.

In the spinal anaesthetic method employed in the state of art, spinal needles with mandrin, i.e the needles, inner space of which is completely occupied by an iron bar (a mandrin), are used. After the insertion of the mandrin needle into the body, the mandrin is drawn-back to allow the cerebro-spinal fluid (CSF) to flow into the syringe. As soon as fluid is seen, the local anaesthetic solution in the sterile plastic syringe is injected to the cerebro-spinal fluid, following the withdrawal of the syringe in order to complete the anaesthetic procedure.

In this procedure, a needle and syringe to administer the local anaesthetic solution, a special needle with mandrin to reach the subarachnoid space, and a syringe to administer the local anaesthetic solution into the CSF, are used successively. The preparation of all these materials takes a lot of time and increases the cost. Furthermore postural headache is observed in the patient as a post-anaesthetic side effect. This type of headache which is particularly observed when the patient is standing up and carrying out normal activities, may cause the patient feel worse and may even keep the patient in bed. As this side effect is mostly considered as related to the needle gauge (thickness) and to the application details practised in this technique; the use of thin spinal needles (of small gauge) are suggested in order to avoid it. However due to the fact that the small gauge spinal needles are too thin and long, they cannot be grasped tightly and as their diameters are too small, the flow of the CSF through them takes time.

The object of the present invention is to provide a syringe with needles without mandrin and particularly to provide a sterile disposable spinal syringe set consisting of these components.

The sterile, disposable spinal syringe set without mandrin realised in order to achieve the above mentioned object of the invention has been illustrated in the attached drawings, wherein:

Figure 1, is the overall view of the sterile, disposable spinal syringe set without mandrin;

Figure 2, is an alternative view of the sterile, disposable spinal syringe set without mandrin as one piece, pre-filled with the medicament.

The components shown in the figures have been separately enumerated as follows:

1. Dental needle

2. Normal size needle

3. Needle body

4. Needle tip 5. Adapter

6. Syringe

7. Cylindrical body

8. Syringe end portion

9. Piston As can been seen in Figure 1, the disposable sterile spinal syringe set without mandrin, consists of a syringe (6), a normal needle (2) and a dental needle (1).

The dental needle (1) may be manufactured with an adapter part (5) made of plastics, in order to facilitate its attachment to the syringe (6). Dental needle (1) is a spinal needle without mandrin. The inner surface of the adapter can be flat, threaded or luer-locked. The main body (3) of the dental needle can be manufactured in various gauges and lengths of a special iron whereas its tip (4) can be made as straight, inclined, with a pin-tip or can be formed obliquely.

The syringe (6) consists of a syringe body (7), an end portion (8) and a piston (9). The syringe body (7) can be made of glass or plastic; and its end portion (8) can be scarfed, threaded or luer-locked. There is a joint made of glass, rubber or plastics, or made with mandrin, at the end of the piston (9). By means of this joint, the piston (9) is placed in the cylindrical body (7) in a liquid-proof manner while moving easily inside the cylinder (7).

Furthermore, by forming a spur on the inner surface of the rear portion of the cylindrical body (7), the piston (9) is prevented from being drawn-out of the cylindrical body (7).

Additionally the cylinder body (7) is provided with scale indicators on its surface, showing the dosage of the medicaments and liquids to be administered.

The set of disposable sterile spinal syringe without mandrin, also contains a needle (2) used for the intake of the medicament. The said needle (2) is also manufactured together with a plastic adapter (5) at its back side, to provide its easy attachment to the syringe (6). The disposable, sterile spinal syringe set without mandrin consists of three components, namely; a syringe (6), a dental needle (1) and a normal needle (2). The operational procedure of performing spinal anaesthesia by using the disposable, sterile spinal syringe set without mandrin is realised as explained below:

The needle (2) is attached to the syringe (6) in order to draw the local anaesthetic medicament into the syringe (6).

Upon the completion of the intake of the local anaesthetic solution to be used, the said needle (2) is removed and the dental needle (1), being a spinal needle without mandrin, is attached to the syringe (6) which has been filled with the local anaesthetic medicament.

The dental needle (1) attached to the syringe (6) is inserted cutaneously and sub-cutaneously by the local anaesthetic application and is directed carefully and slowly towards spinal space. Any resistance during the progressive insertion of the needle is considered to be a bone-contact whereupon the needle (1) is retrieved and redirected. After the needle is assumed to be inserted in a sufficient distance with no trouble, the piston (9) of the syringe (6) to which said needle is attached, is slightly pulled back in order to apply a negative pressure which in turn will cause an increase in the amount of the local anaesthetic medicament in the syringe (6). If the amount of said increase is in a range between 0.5 to 1 ml, the result is positive, i.e. CSF is assumed to be aspired into the syringe. Then the local anaesthetic medicament in the syringe (6) is administered to the patient, thus completing the spinal anaesthesia procedure.

In an alternative embodiment of using the disposable sterile spinal syringe set without mandrin, a normal needle (3) is not employed whereas the disposable sterile syringe (6) pre-filled with medicament for a single-use and a dental needle (1) which is a spinal needle without mandrin are used as one-piece.

In this case, the syringe (6) is not filled by the user and the dental needle (1) which is a spinal needle without mandrin attached to the end portion (8) of the syringe is ready for use (Figure 2).

With this disposable sterile spinal syringe set without mandrin of the invention, less time is required for the application of spinal anaesthesia, cost is decreased and the side effects previously observed in the patients are reduced.

Claims

1. A disposable sterile spinal syringe set with no mandrin, which comprises a syringe (6) consisting of a cylindrical tube (7), and portion (8) and a piston (9); a needle (2) used to draw the medicament into the said syringe (6); and a dental needle (1) being a spinal needle without mandrin and consisting of an inner surface, a body (3) and an end part, i.e its tip.

2. A disposable sterile spinal syringe set with no mandrin, characterized in that the dental needle (1) being a spinal needle without mandrin is manufactured as one-piece, together with a syringe (6) which is prefύled with the local anaesthetic medicament.