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Table 1 Features of TouStar and other reusable pens

From: A review of reusable insulin pens and features of TouStar—a new reusable pen with a dedicated cartridge

Feature

TouStar

AllStar

NovoPen 4

HumaPen Ergo II

INSUPen Pro

Insulin type

Toujeo® U300

Any Sanofi U-100 (Lantus®, Insulin lispro, Apidra®)

Penfill®

Huminsulin® or Humalog®

Insugen-R Refil, Insugen-N Refil, Insugen-30/70® Refil, Insugen-50/50 Refil and Basalog Refill

Maximum dose that can be delivered in one injection (increment in units)

80 U (1 U)

80 U (1 U)

60 U (1 U)

60 U (1 U)

60 U (1 U)

Total capacity

450 U

300 U

300 U

300 U

300 U

User can reverse dial without losing insulin

Yes

Yes

Yes

Yes

Yes

"End of cartridge" dial limit when dialing doses

Yes

Yes

Yes

No

No

Simple "push-to-reset" plunger (no screwing required)

Yes

Yes

Yes

Yes

Yes

Readability, high contrast, magnified dose numbers

Character height (mm) after magnification, if applicable (SD)

3.3 (0.1)

3.2 (0.1)

3.4 (0.0)

3.1 (0.1)

3.0 (0.0)

Character width (mm) after magnification, if applicable (SD)

2.1 (0.0)

2.1 (0.0)

2.4 (0.0)

1.9 (0.0)

2.0 (0.0)

Compactness

Length with Cap fitted in mm (SD)

154.6b (0.2)

154.6b (0.2)

157.1 (0.0)

165.2 (0.1)

166.6 (0.1)

Diameter at widest point excluding pocket clip in mm (SD)

16.3b (0.0)

16.3b (0.0)

15.9 (0.0)

20.2 (0.0)

17.4 (0.0)

Weight—total mass in g, including a full cartridge (SD)

25.9a (0.0)

28.5 (0.0)

56.3 (0.1)

46.6 (0.1)

38.1 (0.0)

Dial extension measured at 60 U from end of dose button to housing in mm. (SD)

27.5b (0.1)

27.5b (0.1)

27.9 (0.0)

44.2 (0.1)

44.2 (0.1)

  1. Differences were tested using a two-sided t-test at a significance level p = 0.001
  2. SD standard deviation
  3. aStatistically significant difference between TouStar and all other pens
  4. bStatistically significant difference between TouStar/AllStar and remaining pens