JPH066130B2 - Bone marrow needle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bone marrow puncture needle used as a medical instrument.

[0002]

2. Description of the Related Art Conventionally, a bone marrow puncture needle for puncturing the bone marrow and letting a cerebrospinal fluid, a medical drug solution and the like flow in and out is made of stainless steel because it does not like rust. Most of them are composed of a hollow tubular outer needle and an inner needle having a conical tip. When puncturing, insert the inner needle into the outer needle, and use only the conical portion of the inner needle so that it projects from the outer needle. At the rear ends of the outer needle and the inner needle, a metal gripping portion and a pressing portion are formed, respectively. When the inner needle is inserted into the outer needle, the grip portion and the pressing portion are often partially fitted to form an integral handle. Puncture while grasping the handle with one hand and applying a screw to the force. When it reaches the bone marrow, pull out the pressing part and pull out only the inner needle. Various operations are performed through the placed outer needle.

[0003]

Since the conventional bone marrow puncture needle is slightly magnetic, when the bone marrow puncture needle is punctured and the inner needle is removed and only the outer needle is left indwelling, spinal fluid Iron contained in the liquid medicine for medical use and the like is adsorbed on the inner wall of the outer needle, which impedes the smooth flow of the medical liquid medicine.

Further, since the conventional bone marrow puncture needle is not hardened, it is weak against bending and easily worn. Since the hardness is small and not uniform, the conical needle tip wears unevenly and easily causes a blade spill. It is very difficult to puncture the bone marrow with a non-sharp needle. The practitioner can puncture with all the power of the body and gradually puncture, resulting in a great loss of physical strength. The subject may also have long and intolerable scratches and leave large scars on the bones and the like. Previously, it was said that the conventional stainless steel was not quenched, but even if it is quenched, it hardly causes a hardening phenomenon.

The present invention is a bone marrow puncture made of special steel stainless that has a non-magnetic property such that a medical drug solution and bone marrow flow smoothly, and a hardness that can easily and easily puncture bone marrow. The purpose is to provide a needle.

[0006]

The present invention provides a carbon content of 0.0
3% or less, silicon 0.30% or less, manganese 0.35%
Below, phosphorus 0.03% or less, sulfur 0.03% or less, copper 0.25% or less, nickel 6.00% to 8.00%,
Chromium 12.00% to 14.00%, titanium 0.80
% To 1.20%, aluminum 0.60% to 1.
The present invention relates to a bone marrow puncture needle characterized by non-magnetism using special stainless steel containing each component of 00%.

The present invention also relates to a bone marrow puncture needle characterized by being non-magnetic, using the special stainless steel of claim 1 which has been quenched and hardened.

[0008]

It has been confirmed by experiments that the special stainless steel containing the above-mentioned components is non-magnetic so that the medical drug solution, bone marrow and the like can smoothly flow. In order to easily process and use special stainless steel for a bone marrow puncture needle, it is necessary to adjust the tensile strength, elongation and hardness of the metal. Then, as a result of producing an ideal special stainless steel in which each component is within the above range and which can be easily processed, it was found that the ratio is shown in the lower part of Table 1.

A quench hardening test was carried out by increasing or decreasing the ratio of each component within the range of the numerical values shown in the upper part of Table 1, that is, the numerical value for ensuring non-magnetism. In all of them, a remarkable hardening phenomenon was observed. The strength is three times that of conventional stainless steel. Since elasticity occurs and bending occurs, it is strong against bending and difficult to break. Actual bone marrow aspiration could be performed quite easily, which was not comparable to the conventional method. Since the hardness was uniform and the wear was stable, only a few blade spills could be confirmed.

[0010]

[Table 1]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to this embodiment.

The ratio in the lower part of Table 1 above, that is, carbon 0.
012%, silicon 0.11%, manganese 0.30%, phosphorus 0.016%, sulfur 0.003%, copper 0.03%, nickel 6.58%, chromium 12.19%, titanium 1.0.
A special stainless steel that is characterized by non-magnetism and contains 7% aluminum and 0.78% aluminum. The inner needle 1 and the outer needle 2 shown in FIGS. 1 and 2A and 2B are made by quenching. Molded. The surfaces of the inner needle 1 and the outer needle 2 were chemically polished so that the bone marrow puncture could be performed more smoothly. In the figure, 3 is a pressing portion formed at the rear end of the inner needle 1. Reference numeral 4 in the figure denotes a grip portion formed at the rear end of the outer needle 2. At the time of puncturing, the inner needle 1 is inserted into the outer needle 2, the pressing portion 3 and the grip portion 4 are integrally assembled to form a handle, which is gripped with one hand and pressed to be used. A claw portion 5 for preventing idling is formed on the pressing portion 3, and the claw portion 5 is fitted into the notch portion 6 formed in the grip portion 4. In the figure, 7 is a stopper for keeping the puncturing depth constant. If the subcutaneous fat is thick, puncture is performed with the stopper 7 removed. When the needle tip reaches the bone marrow,
Only the pressing portion 3 is pulled out to remove the inner needle 1, the outer needle 2 is left in the bone marrow together with the grip portion 4, and various kinds of operations are performed. Flat surfaces 8 are formed on the upper and lower surfaces of the pressing portion 3 for the purpose of stabilizing the inner needle 1 so as to prevent an unexpected injury.

In addition, although some of the components affect the human body in many cases, the components of the examples according to the present invention have been proved to be 100% safe even in the pyrogenic substance test.

In this embodiment, all parts except the inner needle 1 and the outer needle 2 are made of plastic resin (ABS). In order to prevent blood infections, which have become a serious problem in recent years, it is necessary to ensure safety in management use and economic efficiency of disposable use. Since the center of gravity shifts to the inner needle 1 side from the pressing portion 3, there is no danger that the inner needle 1 will face directly above when placed. It is light and easy to handle during surgery. I won't slip even if I sweat on my palm. Further, since the manufacturing cost can be reduced to about 1/10, it is possible to maintain the economical efficiency even if it is disposable.

[0015]

INDUSTRIAL APPLICABILITY As described above, the bone marrow puncture needle according to the present invention is nonmagnetic unlike the conventional one. Therefore, during the puncture with the bone marrow puncture needle according to the present invention and the indwelling of the outer needle, iron components such as spinal fluid and medical drug solution flow smoothly without adsorbing to the inner wall of the outer needle. Since this effect is exhibited at the inner wall portion of the outer needle having a small inner diameter and a relatively long length, it is sure to make a very large difference.

Further, even though it is made of stainless steel, the inner needle and the outer needle are formed of a special steel which, when quenched, has a strength three times as strong as that of the conventional one. The person can puncture the bone marrow with little pain, and the practitioner can easily and easily puncture the body. It is necessary to say that this effect is extremely significant in terms of medical treatment, because it is often necessary to puncture dozens of places per person.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an exploded state of one embodiment of the present invention.

[Explanation of symbols]

 1 inner needle 2 outer needle 3 pressing part 4 gripping part

Claims (2)

[Claims] 1. Carbon 0.03% or less, silicon 0.30%
Below, manganese 0.35% or less, phosphorus 0.03% or less,
Sulfur 0.03% or less, copper 0.25% or less, nickel 6.
00% to 8.00%, chromium 12.00% to 14.
A non-magnetic bone marrow puncture needle made of special stainless steel containing the following components: 00%, titanium 0.80% to 1.20%, and aluminum 0.60% to 1.00%. 2. A bone marrow puncture needle characterized by being non-magnetic, using the special stainless steel according to claim 1 that has been quenched and hardened.