CN203149103U - Gradient coil assembly and shimming strip mold - Google Patents
Gradient coil assembly and shimming strip mold Download PDFInfo
- Publication number
- CN203149103U CN203149103U CN 201320019045 CN201320019045U CN203149103U CN 203149103 U CN203149103 U CN 203149103U CN 201320019045 CN201320019045 CN 201320019045 CN 201320019045 U CN201320019045 U CN 201320019045U CN 203149103 U CN203149103 U CN 203149103U
- Authority
- CN
- China
- Prior art keywords
- shimming
- conduit
- gradient coil
- coil assembly
- auxiliary member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 239000005060 rubber Substances 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 239000003292 glue Substances 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 description 7
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 208000037656 Respiratory Sounds Diseases 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002595 magnetic resonance imaging Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000023753 dehiscence Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The utility model discloses a gradient coil assembly and a shimming strip mold. The gradient coil assembly comprises a body part and shimming holes, wherein the body part has an accommodating cavity, the shimming holes are arranged on the body part and extend along the axial direction, each of the shimming holes includes a first groove channel and a second groove channel which is adjacent to the front end face or the rear end face of the body part, and the second groove channel is radially wider than the first groove channel. The shimming strip mold comprises a strip-shaped body and an auxiliary part, wherein the strip-shaped body corresponds to the first groove channels, and the auxiliary part is arranged on a free tail end of the strip-shaped body and fits the second groove channels. The second groove channels, with larger width, of the shimming holes easily assemble shimming sheets in the first groove channels. The shimming strip mold is equipped with the auxiliary part, the strip-shaped body does not contact the tail ends of the shimming holes, and after the auxiliary part is taken out, a closed angle formed by glue pouring is not subject to hard impact of the strip-shaped body of the shimming strip mold to damage or crack the shimming holes of the gradient coil assembly.
Description
[technical field]
The utility model relates to the mr imaging technique field, relates in particular to the shimming bar mould in the shimming hole of a kind of gradient coil assembly for magnetic resonance imaging and this gradient coil assembly of moulding.
[background technology]
Magnetic resonance imaging need have the magnetic field of high strength and high uniformity, and this magnetic field is provided by the electromagnet of superconduction or resistive coil usually.At present, though the design of magnet system has been dropped into great effort so that it can produce the high strength uniform field.Yet the designed magnet system that goes out still can not produce magnetic field fully uniformly in actual applications.Main cause have following some: manufacturing tolerance makes coil from the skew of its design attitude inevitably, and the characteristic of employed electric wire may be different from the characteristic of supposing in the design process; In addition, when magnet is installed in operationlocation, its producible magnetic field will be subjected to the influence of surrounding environment, and for instance, in hospital environment, the structure of buildings contains structural steel usually, and near miscellaneous equipment will influence the final field that produces of magnet system.For those reasons, use shimming (shimming) to proofread and correct actual field and the deviation that designs the field, improve actual field, so that actual field approaches the design field more.Known two types shimming: active shimming and passive shimming.Active shimming refers to increase the shim coil in magnet system, by adjusting the electric current in the shim coil, make it produce the magnetic field of the field that influences magnet system on the whole.Passive shimming relates in magnetic field places multi-disc magnetic material (normally steel) so that the true field distortion, makes it more approachingly be similar to designed magnetic field.
At the magnet system that is used for imaging, many coils carry electric currents are to produce high strength and uniform relatively magnetic field.This can be described as home court or ambient field.In addition, need gradient fields, gradient fields changes to some extent along the axial intensity of home court, and is not to be uniform.Usually, gradient coil is arranged in the tubular space of inner radial of home court line chart.See also Fig. 1 and Fig. 2, a kind of typical gradient coil assembly 20 comprises the lead that is embedded in the potting material (for example resin).In addition, gradient coil assembly also is provided with some shimmings hole 202 of extending vertically, and some shimming sheets 10 are installed in the shimming hole 202.The shimming sheet is the plates of being made by magnetic material.
The shimming hole 202 of gradient coil assembly 20 is by corresponding shimming bar mould is set in die cavity in advance among Fig. 1, treat the encapsulating moulding after, shimming bar mould is taken out, can obtain.In the actual production, because it can not be right angle (not considering pattern draft) completely that machining precision and production cost cause the corner of the depanning end of shimming bar mould, even machining precision is very high at the beginning, the corner does not have chamfering or fillet, in long-term use, the corner is rust slowly also, produces chamfering or fillet.Like this when encapsulating, resin can be filled this chamfering or fillet, and curing molding, cause when depanning, not only need to overcome resin to the adhesive power of mould during the depanning of shimming bar mould, also need chamfering or fillet are broken through, and the required destructive power of hard brittle material is big, increased the required impulsive force of depanning, and may crack at shimming porous dehiscence line stress raiser, simultaneously, because wedge angle is removed not thoroughly when being broken through, form sharp knife-edge, can stay cut at die surface, scratch the coating of die surface.The crackle at place, gradient coil shimming hole can reduce the fatigue behaviour of gradient coil, has also increased the possibility that the gradient coil inner water tube is torn.
[utility model content]
Technical problem to be solved in the utility model provides a kind of improved gradient coil assembly and for the manufacture of the shimming bar mould of this gradient coil assembly.
The utility model is that to solve the problems of the technologies described above the technical scheme that adopts as follows: a kind of gradient coil assembly, comprise the main part with host cavity, the shimming hole that is arranged on the main part and extends vertically, described shimming hole comprises second conduit of first conduit and contiguous main part front end face or rear end face, and second conduit is wide diametrically than first conduit.
Further, described first conduit is long in the axial direction than second conduit.
Further, the longitudinal section of described first conduit is rectangle, and the longitudinal section of second conduit is isosceles trapezoid.
Further, described first conduit, second conduit axially set gradually and are interconnected same.
The utility model is that to solve the problems of the technologies described above the technical scheme that adopts as follows: a kind of shimming bar mould for gradient coil assembly, comprise the strip shape body corresponding with first conduit and the auxiliary member that is arranged on the free terminal of strip shape body, and auxiliary member and second conduit match.
Further, described auxiliary member is provided with accepting hole, is used for holding the free terminal of strip shape body.
Further, the accepting hole of described auxiliary member is the through hole that extends in the axial direction, and the longitudinal section of through hole is rectangle or T type.
Further, described auxiliary member is made by silica gel or rubber or plastic material.
Further, the height of described auxiliary member from large to small vertically.
Further, described strip shape body is made from aluminum or steel.
The utility model contrast prior art has following beneficial effect: gradient coil assembly is provided with the shimming hole, can be used for holding corresponding shimming sheet, can improve the homogeneity in magnetic field, and the shimming hole has second conduit of big width, convenient the shimming sheet is assembled in first conduit; On the shimming bar mould auxiliary member is set, when the shimming hole of encapsulating molding gradient coil block, the strip shape body of shimming bar mould does not contact with the end in shimming hole, after taking out auxiliary member, the rigid impact of strip shape body that the wedge angle that encapsulating forms can not be subjected to shimming bar mould causes breakage or the crackle in the shimming hole of gradient coil assembly, the coating of the strip shape body that same wedge angle can scratch shimming bar mould yet.
[description of drawings]
Fig. 1 is the structural representation of gradient coil assembly in the prior art;
Fig. 2 is the enlarged drawing that is installed in the shimming sheet in the shimming hole of the gradient coil assembly among Fig. 1;
Fig. 3 is the front view of the utility model gradient coil assembly;
Fig. 4 is that Fig. 3 is along the sectional view of A-A direction;
Fig. 5 is the partial enlarged drawing of Fig. 4;
Fig. 6 is the structural representation that is used for the shimming bar mould in molding gradient coil block shimming hole;
Fig. 7 is that Fig. 6 is along the sectional view of B-B direction;
Fig. 8 is the different structural representations that change the auxiliary member of routine shimming bar mould with Fig. 9.
[embodiment]
The utility model will be further described below in conjunction with drawings and Examples.
See also Fig. 3 to Fig. 5, the utility model gradient coil assembly 1 is the ingredient for the magnet system of magnetic resonance imaging.Gradient coil assembly 1 comprises some coils by the metallic conductor coiling and is molded over the formed main part 11 of resin material above the coil.It is cylindric that main part 11 roughly becomes, and is provided with the columned host cavity 12 that is positioned at its center.Main part 11 is provided with some be used to the shimming hole (conduit) 13 of accommodating shimming sheet (not shown), and the front and rear end of main part 11 is run through in shimming hole 13.Shimming hole 13 comprises first conduit 131 of extension vertically and second conduit 132 of contiguous main part front end face or rear end face.First conduit 131, second conduit 132 set gradually in the axial direction and are interconnected, and first conduit 131, the 132 coaxial settings of second conduit.Second conduit 132 is wide diametrically than first conduit 131, and first conduit 131 is long in the axial direction than second conduit 132.In a preferred embodiment, shimming hole 13 is " Y " type, and the longitudinal section of first conduit 131 is rectangle, and the longitudinal section of second conduit 132 is isosceles trapezoid.Gradient coil assembly 1 is provided with shimming hole 13, can be used for holding corresponding shimming sheet (not shown), can improve the homogeneity in magnetic field, and shimming hole 13 has second conduit 132 of big width, convenient the shimming sheet is assembled in first conduit 131
See also Fig. 5 to Fig. 9, be used for the shimming bar mould 2 in the shimming hole 13 of molding gradient coil block 1.Shimming bar mould 2 comprises the strip shape body 21 corresponding with first conduit 131 and the free terminal 211 and auxiliary member 22 second conduit 131 corresponding (coincideing) that is arranged on strip shape body 21.In the present embodiment, the xsect of strip shape body 21 is roughly rectangle, and in other embodiments, the interface of strip shape body also can be circular or other structures.Auxiliary member 22 is provided with accepting hole 221, and it is used for holding the free terminal 211 of strip shape body 21.Auxiliary member 22 can be made by silica gel, rubber or plastic materials such as ABS, POM.Strip shape body 21 can be made by aluminium, steel or other materials.
When the shimming hole 13 of encapsulating molding gradient coil block 1, even there are chamfering or fillet in four limits of the auxiliary member of shimming bar mould 2 22 self end face, cause resin glue to form wedge angle at auxiliary member 22 chamfering places, but because this wedge angle does not contact with the strip shape body 21 of shimming bar mould 2, after taking out auxiliary member 22, the strip shape body 21 rigid impacts that the wedge angle that encapsulating forms can not be subjected to shimming bar mould 2 cause breakage or the crackle in the shimming hole 13 of gradient coil assembly 1, the coating of the strip shape body that same wedge angle can scratch shimming bar mould 2 yet.
In practice, 13 places, shimming hole that auxiliary member 22 is installed do not have crackle, and the wedge angle that encapsulating forms heats and removed with guarded blade utility knife after 2 depannings of shimming bar mould.
See also Fig. 8 and Fig. 9, the auxiliary member 22a-22f of the shimming bar mould of other structures.The auxiliary member 22a-22c of the shimming bar mould 2 among Fig. 8 has the roughly the same accepting hole 221a-221c of structure, and accepting hole 221a-221c is the through hole that extends in the vertical, and the longitudinal section of through hole is rectangle; Its difference is that the contact end face 222a of auxiliary member 22a is (arc) curved surface, and the contact end face 222b of auxiliary member 22b is the dip plane, and the contact end face 222c of auxiliary member 22c is the combination of surface level and dip plane.It is roughly the same and have an accepting hole 221d-221f of T-shape longitudinal section that the auxiliary member 22d-22f of the shimming bar mould 2 among Fig. 9 has structure, its difference is that the contact end face 222d of auxiliary member 22d is (arc) curved surface, the contact end face 222e of auxiliary member 22e is the dip plane, and the contact end face 222f of auxiliary member 22f is the combination of surface level and dip plane.Auxiliary member 22a-22f from large to small highly vertically, namely near the appropriate section height maximum of the auxiliary member 22a-22f at the least significant end place of the strip shape body 21 of shimming bar mould 2, diminish away from the appropriate section height of the auxiliary member 22a-22f at the least significant end place of strip shape body 21.The auxiliary member 22a-22f of this structure is convenient to be stripped from out from gradient coil assembly 1 shimming hole 13, and can itself not constitute too much infringement to gradient coil assembly 1.
Though the utility model discloses as above with preferred embodiment; so it is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.
Claims (10)
1. gradient coil assembly, comprise the main part with host cavity, the shimming hole that is arranged on the main part and extends vertically, it is characterized in that: described shimming hole comprises second conduit of first conduit and contiguous main part front end face or rear end face, and second conduit is wide diametrically than first conduit.
2. gradient coil assembly as claimed in claim 1 is characterized in that, described first conduit is long in the axial direction than second conduit.
3. gradient coil assembly as claimed in claim 1 is characterized in that, the longitudinal section of described first conduit is rectangle, and the longitudinal section of second conduit is isosceles trapezoid.
4. gradient coil assembly as claimed in claim 1 is characterized in that, described first conduit, second conduit axially set gradually and are interconnected same.
5. a shimming bar mould that is used for the described gradient coil assembly of claim 1 comprises the strip shape body corresponding with first conduit and the auxiliary member that is arranged on the free terminal of strip shape body, and auxiliary member and second conduit match.
6. shimming bar mould as claimed in claim 5 is characterized in that described auxiliary member is provided with accepting hole, is used for holding the free terminal of strip shape body.
7. shimming bar mould as claimed in claim 5 is characterized in that, the accepting hole of described auxiliary member is the through hole that extends in the axial direction, and the longitudinal section of through hole is rectangle or T type.
8. shimming bar mould as claimed in claim 5 is characterized in that, described auxiliary member is made by silica gel or rubber or plastic material.
9. shimming bar mould as claimed in claim 5 is characterized in that, the height of described auxiliary member from large to small vertically.
10. shimming bar mould as claimed in claim 5 is characterized in that described strip shape body is made from aluminum or steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320019045 CN203149103U (en) | 2013-01-15 | 2013-01-15 | Gradient coil assembly and shimming strip mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320019045 CN203149103U (en) | 2013-01-15 | 2013-01-15 | Gradient coil assembly and shimming strip mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203149103U true CN203149103U (en) | 2013-08-21 |
Family
ID=48976619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320019045 Expired - Lifetime CN203149103U (en) | 2013-01-15 | 2013-01-15 | Gradient coil assembly and shimming strip mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203149103U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107462850A (en) * | 2016-06-02 | 2017-12-12 | 上海联影医疗科技有限公司 | Gradient coil assembly |
| CN113702884A (en) * | 2021-08-26 | 2021-11-26 | 深圳市联影高端医疗装备创新研究院 | Medical imaging equipment |
| CN114200366A (en) * | 2021-12-16 | 2022-03-18 | 武汉联影生命科学仪器有限公司 | Shimming device, magnetic field assembly, magnetic resonance imaging system and shimming method |
-
2013
- 2013-01-15 CN CN 201320019045 patent/CN203149103U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107462850A (en) * | 2016-06-02 | 2017-12-12 | 上海联影医疗科技有限公司 | Gradient coil assembly |
| CN113702884A (en) * | 2021-08-26 | 2021-11-26 | 深圳市联影高端医疗装备创新研究院 | Medical imaging equipment |
| CN114200366A (en) * | 2021-12-16 | 2022-03-18 | 武汉联影生命科学仪器有限公司 | Shimming device, magnetic field assembly, magnetic resonance imaging system and shimming method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101300728B (en) | Production method of rotor and rotor | |
| CN203149103U (en) | Gradient coil assembly and shimming strip mold | |
| US20140290891A1 (en) | Chaplet, cast molding system, and method | |
| CA2739256A1 (en) | An electrical machine and a method for assembling it | |
| EP2209128B1 (en) | Gapped magnet core | |
| CN206595791U (en) | The rotor of motor | |
| CN107462850B (en) | Gradient coil assembly | |
| CN111585367A (en) | Rotor assembly, production method thereof and hub motor | |
| JP2009159752A (en) | Linear motor and manufacturing method | |
| CN210041475U (en) | HALBACH array motor rotor | |
| JP6318945B2 (en) | Coreless linear motor armature, coreless linear motor, and manufacturing method of coreless linear motor armature | |
| CN106298216B (en) | Magnetic field system assembly method | |
| CN201572881U (en) | Embedded mold core used for casting | |
| CN204205876U (en) | A kind of coil inserting apparatus rule mould | |
| CN202462746U (en) | Demolding device for insulation disk | |
| CN206344344U (en) | A kind of location structure of composite steel-plastic pipe fitting skeleton | |
| CN111371265A (en) | Manufacturing method of embedded permanent magnet motor rotor | |
| CN205354792U (en) | Magnetizing device | |
| CN213185669U (en) | Tractor magnet steel disc | |
| CN201217586Y (en) | Integral wire coil | |
| CN204665428U (en) | Electric field insulated isolated device | |
| CN204029596U (en) | Current transformer wire resin material support insulators | |
| KR101493974B1 (en) | Production method of silicon-busbar | |
| CN204069622U (en) | An electromagnetic radiator adopting a high-voltage insulating and sealing structure | |
| CN203554106U (en) | Low eddy current loss permanent magnet motor rotor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201815 No. 1180 Xingxian Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee after: Shanghai Lianying Medical Technology Co.,Ltd. Address before: 201815 No. 1180 Xingxian Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130821 |
|
| CX01 | Expiry of patent term |