CN101711700B - Magnetic resonance imaging (MRI) compatible needle knife - Google Patents

Abstract

The present invention provides a magnetic resonance imaging compatible needle knife, comprising: a needle knife handle, a needle knife body and a needle knife head; wherein: the needle knife body and the needle knife head are made of paramagnetic metal material; and, the paramagnetic A layer of diamagnetic metal material coating is coated on the metal material. In the present invention, since the diamagnetic metal material coating can counteract the magnetization effect of the external magnetic field on the paramagnetic metal material, the paramagnetic metal material will not cause the magnetic field distortion of the magnetic resonance equipment, and will not Artifacts are produced in scanned images. Moreover, since both the paramagnetic and diamagnetic metal materials are composed of metal elements, the mechanical properties of the needle knife body and the needle knife head can be guaranteed, thereby meeting the requirements of needle knife surgery.

Description

A magnetic resonance imaging MRI compatible needle knife

technical field

The invention designs a medical device, in particular to an MRI compatible needle knife for magnetic resonance imaging.

Background technique

A kind of needle knife is disclosed among the Chinese patent 98208305. This acupotomy organically integrates the surgical treatment method of Western medicine and the acupuncture treatment method of Chinese medicine in the treatment of diseases, and turns the open operation of Western medicine into a closed operation. Needle-knife surgery can not only achieve the purpose of cutting, loosening, peeling, and clearing the lesion, but also does not need to cut the skin and related tissues, and avoids the sequelae and complications of surgery, thus becoming a clinically applicable, An operational medical technology.

However, due to the characteristics of closed surgery such as needle-knife surgery, doctors cannot directly see the lesion during the operation, so needle-knife surgery requires doctors to have rich knowledge of physiological anatomy and clinical experience. In order to assist doctors to perform "visualized" operations and reduce the risk of needle-knife surgery, magnetic resonance imaging-guided (MRI-guided) needle-knife surgery has become an important development trend in the field of needle-knife medicine.

Magnetic resonance imaging guidance makes full use of the good tissue anatomical structure resolution ability of magnetic resonance imaging and the high contrast between diseased tissue and normal tissue. Through rapid imaging technology, the whole process of needle-knife surgery is monitored in real time, which can help doctors understand and judge at any time. The positional relationship between the acupotomy and the lesion and its surrounding important blood vessels and nerves determines the scope of the operation, and then achieves the purpose of real-time monitoring of the curative effect of the operation.

In order to perform magnetic resonance imaging-guided needle-knife surgery, the surgical needle-knife should have non-magnetic properties to be compatible with magnetic resonance equipment. However, traditional needle knives are mostly made of stainless steel. When this kind of needle knife is used for magnetic resonance imaging-guided needle-knife surgery, it will cause magnetic field distortion of the magnetic resonance equipment, affect the quality of magnetic resonance imaging, and bring Serious nuclear magnetic safety issues. To this end, US Patent No. 6,258,071 proposes an MRI-compatible needle knife made of ceramic material. Although ceramic materials have non-magnetic properties, their texture is relatively brittle and hard, so the mechanical properties of needle knives made of ceramic materials are not ideal. In addition, US Patent No. 5,730,732 proposes an MRI compatible needle knife made of 316 type stainless steel material. Although the mechanical properties of this needle knife can meet the requirements, when it is used for magnetic resonance imaging, it will still produce serious artifacts (artefact) in the scanned image, especially at the position of the needle knife head, so that doctors cannot Make a good observation of the lesion area and accurately judge the position of the needle knife head.

Contents of the invention

In view of this, the object of the present invention is to provide an MRI-compatible needle knife, which has good mechanical properties and does not produce artifacts in the scanned image.

The above object of the present invention is achieved through the following technical solutions: a magnetic resonance imaging compatible needle knife, comprising: a needle knife handle, a needle knife body and a needle knife head; wherein:

The needle blade body and the needle blade head are made of a paramagnetic metal material; and,

The paramagnetic metal material is coated with a layer of diamagnetic metal material coating.

According to the needle knife of the present invention, the paramagnetic metal material is platinum, magnesium, aluminum or titanium, and the diamagnetic metal material is gold, silver or bismuth.

According to the needle knife of the present invention, there is a notch on the coating of the paramagnetic metal material at the needle knife head, and the needle knife head is only made of the paramagnetic metal material at the notch.

According to the needle knife of the present invention, the notch is an annular notch surrounding the needle knife head.

According to the needle knife of the present invention, the needle knife body is hollow tubular, and has openings at both ends of the needle knife handle and the needle knife head.

According to the needle knife of the present invention, the needle knife handle and the needle knife body are detachable, and the needle knife handle is made of plastic.

According to the needle knife of the present invention, wherein, the needle knife handle is integrated with the needle knife body, and the needle knife handle is also made of the paramagnetic metal material, and the paramagnetic metal material is coated with the Metallic coating of diamagnetic material.

In the present invention, the needle blade body and the needle blade head are designed as a double-layer structure, and the coating of the diamagnetic metal material can counteract the magnetization effect of the external magnetic field on the paramagnetic metal material, so that the paramagnetic metal material The material does not distort the magnetic field of the MRI system and does not produce artifacts in the scanned image. Moreover, since both the paramagnetic and diamagnetic metal materials are composed of metal elements, the mechanical properties of the needle knife body and the needle knife head can be guaranteed, thereby meeting the requirements of needle knife surgery.

Description of drawings

The purpose and features of the present invention will be described in detail below in conjunction with the accompanying drawings and through specific embodiments. These specific implementations are illustrative and not restrictive.

Fig. 1 is a schematic diagram of the structure of a needle knife in an embodiment of the present invention;

Fig. 2 is a schematic diagram of the cross-sectional direction of the needle knife shown in Fig. 1;

Fig. 3 is A-A sectional schematic diagram in Fig. 2;

Fig. 4 is a schematic cross-sectional view of B-B in Fig. 2 .

Detailed ways

The magnetic resonance imaging compatible needle knife of the present invention comprises: a needle knife handle, a needle knife body and a needle knife head; wherein, the needle knife body and the needle knife head are made of a paramagnetic (paramagnetism) metal material; and, the paramagnetic metal The material is coated with a layer of diamagnetism metal material coating.

In the present invention, in order to make the needle knife compatible with the nuclear magnetic resonance equipment while maintaining the required mechanical properties of the needle knife, the needle knife body and the needle knife head are designed as the above-mentioned double-layer structure. In this way, when performing magnetic resonance imaging-guided acupotomy surgery, the coating of the diamagnetic metal material on the needle-blade body and the needle-blade head entering the imaging area will cancel the magnetization of the paramagnetic metal material by an external magnetic field , so the paramagnetic metal material will not cause the magnetic field distortion of the magnetic resonance equipment, and will not produce artifacts in the scanned image. Moreover, since both the paramagnetic and diamagnetic metal materials are composed of metal elements, the mechanical properties of the needle knife body and the needle knife head can be guaranteed, thereby meeting the requirements of needle knife surgery.

In one embodiment of the present invention, as shown in FIG. 1 , the needle knife is composed of a needle knife handle 1 , a needle knife body 2 and a needle knife head 3 . Wherein, the needle blade body 2 and the needle blade head 3 are made of a paramagnetic metal material 5 , and a diamagnetic metal material coating 6 is coated on the paramagnetic metal material 5 . In this embodiment, the paramagnetic metal material 5 can be made of platinum, magnesium, aluminum or titanium, preferably titanium, and the diamagnetic metal coating 6 can be made of gold, silver or bismuth, preferably a bismuth coating .

In this embodiment, in order to further help the doctor judge the position of the needle cutter head 3, there is a gap 7 on the diamagnetic metal material coating 6 at the needle cutter head 3, and the needle cutter head 3 can only be moved along the notch 7. Magnetic metal material 5 is made. In this way, through the weak magnetism shown by the paramagnetic metal material 5 in the external magnetic field, the position of the notch 7 will be displayed as a black spot on the scanned image, and the doctor can know the needle knife through the position of the black spot on the scanned image. The position of head 3. As a way of identifying the position of the needle knife head 3, the shape of the notch 7 can be any appropriate shape, as long as the black spot formed on the scanned image at the position of the notch 7 can be distinguished by the doctor. In this embodiment, the notch 7 is preferably an annular notch surrounding the needle cutter head 3 . Fig. 2, Fig. 3 and Fig. 4 respectively show the A-A cross-sectional direction of the needle knife body 2 part, the B-B cross-sectional direction of the needle knife head 3 part and the corresponding cross-sectional schematic diagrams of the needle knife shown in Fig. 1 .

Since the acupotomy surgery sometimes needs to cooperate with sealing, laser, chemical and other treatments at the same time, therefore, the acupotomy body 3 in this embodiment is preferably hollow tubular, and has openings at both ends of the acupotomy handle 1 and the acupotomy head 3 , like this, sealing liquid medicine, laser light, chemical medicament etc. just can be transported to lesion place from the tube of needle blade body 3.

In order to save the manufacturing cost of the needle-knife, and because the needle-knife handle 1 will not enter the imaging area in the needle-knife surgery guided by magnetic resonance imaging, the needle-knife handle 1 can use a structural component 4 that is detachable from the needle-knife body 2, and is composed of made of plastic, as shown in Figure 1. The detachable structure between the needle knife handle 1 and the needle knife body 2 can be, for example, a plug-in, clamping or screw connection structure, and the specific shape of the needle knife handle 1 can be, for example, oval, drop-shaped or gourd-shaped.

In addition, optionally, the needle knife handle 1 can also be made into one body with the needle knife body 2. At this time, the needle knife handle 1 is also made of a paramagnetic metal material 5, and the paramagnetic metal material 5 is coated with a metal coating of a diamagnetic material. Layer 6, such a structure can make the needle knife have better mechanical properties, and at the same time prevent the part of the needle knife handle 1 from being affected by the magnetic force of the external magnetic field.

Claims (7)

1. a nuclear magnetic resonance compatible needle knife comprises: pin handle of a knife, pin blade and pin cutter head; It is characterized in that:

Said pin blade and pin cutter head are processed by the paramagnetic metal material; And,

Be coated with one deck diamagnetism metal material coating on the said paramagnetic metal material, said diamagnetism metal material coating is in order to offset the magnetization of externally-applied magnetic field to said paramagnetic metal material.

2. pin cutter as claimed in claim 1, wherein, said paramagnetic metal material is platinum, magnesium, aluminum or titanium, said diamagnetism metal material is gold, silver or bismuth.

3. according to claim 1 or claim 2 pin cutter wherein, has a breach on the said diamagnetism metal material coating at said pin cutter head place, and said pin cutter head is only processed by said paramagnetic metal material in said indentation, there.

4. pin cutter as claimed in claim 3, wherein, said breach is an annular breach around said pin cutter head.

5. according to claim 1 or claim 2 pin cutter, wherein, said pin blade is a hollow tubular, and has opening at said pin handle of a knife and said pin cutter head two ends.

6. according to claim 1 or claim 2 pin cutter, wherein, said pin handle of a knife and pin blade are detachable, and said pin handle of a knife is made of plastics.

7. according to claim 1 or claim 2 pin cutter, wherein, said pin handle of a knife and pin blade are one, and said pin handle of a knife also processed by said paramagnetic metal material, are coated with said antimagnetic material metal coating on the said paramagnetic metal material.

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