Zzanggu Flexible Shaft Couplings 5mm to 8mm(2PCS) NEMA 17 Stepper Motors for RepRap 3D Printer or CNC Machine, 3D Printer Accessories

Zzanggu 2PCS Flexibility Coupling, Shaft Couplings 5mm to 8mm for 3D Printer or CNC Machine

【Shaft Usage Range】

Suitable for 5mm to 8mm/ 0.19 to 0.31 inch

【Materials】 Aluminum alloy

【Size】 25mm x 19mm(L x D)

【Main Color】 Silver

【Weight】 18g / 0.63 oz

【Features】

[1] Zero backlash. One-piece metallic spring coupling. For little torque shaft connect

[2] Flex capability of the coupler removes stress when shafts are not aligned perfectly

[3] Useful in RepRap 3D Printers and small CNC machines

[4] Compatible with NEMA 17 stepper motors (for 5mm to 8mm shaft diameter).

【Packaging Includes】

Flexibility Coupling(5mm to 8mm) x2

Product Features

  • Flexible Coupling Range: 5mm to 8mm / 0.19 to 0.31 inch
  • Material: Aluminum alloy with 25mm x 19mm(L x D)
  • Flexibility of this coupler removes stress between motor and driving component
  • Shaft Coupling with zero backlash for little torque shaft connect
  • Useful in RepRap 3D Printers and small CNC machines, compatible with NEMA 17 stepper motors (for 5mm to 8mm shaft diameter)

Detailed Information available on our Homepage…

Proximal third humeral shaft fractures fixed with long helical PHILOS plates in elderly patients

The optimal treatment for humeral shaft fracture remains controversial. Although a large proportion of these fractures can be treated without surgery, a recent study, involving a randomized controlled trial, compared bridge plate with functional brace fixation for humeral shaft fractures and concluded that surgical plating has a statistically significant advantage with a better DASH score, lower non-union rate, and lower residual deformity rate [1]. As for proximal third humeral shaft fractures, they were thought to be complicated with a higher non-union rate when treated conservatively compared with middle and distal fractures [2, 5, 16]. Since the helical plating technique was introduced for the treatment of humeral fractures, some studies have shown that this technique resulted in increased stiffness compared to fixation with a straight plate under torsional loading and produced satisfactory clinical outcomes [14, 17]. However, how to produce a suitable helical plate for each individual patient is a big question for surgeons. Previous studies have proven that the 3D printing technique is a good tool for designing surgical plans and pre-contouring plates used to treat other bone fractures [1820]. Our results demonstrate the benefit of pre-contouring plates on a 3D-printed model for this special technique.

In this study, all kinds of fractures (from type A to type C) were treated by helical plating technique, and satisfactory outcomes were obtained. It was coincident with our previous cadaveric study results [11], so we thought this special technique was a good choice for these fractures. Previously, Stedtfeld and Biber reported that approximately 49.3% of the proximal third humeral shaft fractures extend into the humeral head and that this type of fracture cannot be characterized by conventional AO classification [6]. In our study, a total of 41.3% (19/46) of fractures involved the proximal humerus, a rate slightly lower compared with their report, but still a high rate of these fractures. Consequently, attention should be paid on the proximal third humeral shaft fractures since about half of them need adequate proximal fixation.

At the 1-year follow-up visit, all fractures were healed and none of the patients had suffered non-union, an outcome better than that reported for other treatment methods [1, 2, 5, 9, 2123]. The mean union times of the Synbone group and the 3D-printed groups were 16.16 and 15.57 weeks, respectively, which was similar to other studies even though our patients were older than in other studies [11, 17, 24]. Functional evaluations were satisfactory but were worse than those reported by others who conducted the same surgeries (Constant-Murley score 76.80, 76.95 vs. 88.6) [13, 17]. This may be attributed to the fact that our population was much older, so that humeral fracture might be combined with rotator cuff degeneration in our enrolled patients.

The primary outcomes of this study were that surgical duration and blood loss were reduced by the use of a 3D-printed model for pre-contouring the plates before surgery. This result was consistent with our hypothesis and can be explained by the fact that the humeri of older patients in our country are much shorter than the standard Synbone, requiring surgeons to adjust the plates during surgery. Since the 3D-printed model represented the actual size of the bone, the plates pre-contoured on these models were always suitable for fixing the fractures. Because of MIPO technique application, there was only 15 ml of blood loss difference between the two groups; maybe it was not clinically relevant, but on the whole, it reduced 12.5% of blood loss volume and presented a small part of the benefit of 3D-printed technique.

We compared the outcomes between the two grades of surgeons in the 3D-printed group. Although senior attending doctors are much more experienced than junior attending doctors, the results showed that there was no significant difference between them in terms of outcome. We believed that the 3D printing technique would make this novel technique much easier and make it available for use by less specialized surgeons. However, since all fractures in the Synbone group were finished by senior attending doctors, it was impossible to compare the results with a control group.

There are some limitations to this study: (I) the retrospective design limits the level of evidence and only represents one single center; (II) some patients who died within 1 year of surgery are excluded from this study, which may influence the final results; (III) all these surgeries were finished by surgeons in one trauma center, so personal differences cannot be avoided; and (IV) this study only included Asian population, and maybe the results could be challenged by other races because of different skeletal sizes.

UEETEK 4pcs Flexible Shaft Couplings 5mm to 8mm Stepper Motor Coupler Aluminum Alloy Joint Connector for RepRap 3D Printer CNC Machine

Description

Adoption of premium aluminum material, it is durable and long lasting use. The shaft coupler often used to connect servo motor, stepper motor, encoder, screw driving, machine platform, etc. It provides an extremely tight grip without marring the shaft. Compatible with stepper motors, 3D Printers or small CNC machines.

Feature

– Color: Silver.
– Material: Aluminum alloy.
– Size: About 2.5 x 1.9 x 1.9cm/1 x 0.7 x 0.7inch(LxWxH).
– Made of premium aluminum material, it is durable and long lasting use.
– Shaft coupler often used to connect servo motor, stepper motor, encoder, screw driving, machine platform, etc.
– The motor shaft coupler provides an extremely tight grip without marring the shaft.
– Compatible with stepper motors (for 5mm shaft diameter). Fits for RepRap 3D Printers or small CNC machines.
– Shaft: 5mm to 8mm / 0.2inch to 0.31inch.
Package Including
4 x Flexible Shaft Couplings 5mm to 8mm Stepper Motor Coupler Aluminum Alloy Joint Connector for RepRap 3D Printer CNC Machine

Product Features

  • Made of premium aluminum material, it is durable and long lasting use.
  • Shaft coupler often used to connect servo motor, stepper motor, encoder, screw driving, machine platform, etc.
  • The motor shaft coupler provides an extremely tight grip without marring the shaft.
  • Compatible with stepper motors (for 5mm shaft diameter). Fits for RepRap 3D Printers or small CNC machines.
  • Size: About 2.5 x 1.9 x 1.9cm/1 x 0.7 x 0.7inch(LxWxH).

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2 PCS Flexible Couplings 5mm to 8mm NEMA 17 Shaft for RepRap 3D Printer Prusa i3 or CNC Machine

Product Specifications:

Product Name: 3D Printer Flexible Couplings

Material: Aluminum Alloy

Product size: ø18mm, 5mm × 5mm × 25mm / 5mm × 8mm × 25mm

Product use: 3D printing

Color classification: silver white

ProducFeatures: Simple structure, easy to install, buffer, shock absorption, wear, easy disassembly and so on.

Package Content : 2 x Beam Coupling(1 x 5-5mm,1 x 5-8mm)

Product Features

  • Product use: Elastic coupling can eliminate the stress between the motor and the drive parts.
  • Product size: diameter 18mm, 5mm * 8mm * 25mm.
  • Material: aluminum alloy.
  • Color classification: silver white.
  • Features: simple structure, easy to install.

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