A61M 5/31511
Piston or piston-rod constructions
Official title: {Piston or piston-rod constructions, e.g. connection of piston with piston-rod (A61M5/5066 takes precedence)}
A61M5/31511 (Piston or piston-rod constructions) appears on 2,853 US grants and 3,644 published applications in this corpus.
Search patents in A61M- Granted patents
- 2,853
- Published applications
- 3,644
- Assignees
- 987
- Inventors
- 4,544
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 4 | 0 |
| 1978 | 5 | 0 |
| 1979 | 4 | 0 |
| 1980 | 10 | 0 |
| 1981 | 6 | 0 |
| 1982 | 8 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 6 | 0 |
| 1986 | 6 | 0 |
| 1987 | 13 | 0 |
| 1988 | 7 | 0 |
| 1989 | 10 | 0 |
| 1990 | 10 | 0 |
| 1991 | 16 | 0 |
| 1992 | 11 | 0 |
| 1993 | 13 | 0 |
| 1994 | 28 | 0 |
| 1995 | 31 | 0 |
| 1996 | 22 | 0 |
| 1997 | 21 | 0 |
| 1998 | 38 | 0 |
| 1999 | 36 | 0 |
| 2000 | 32 | 0 |
| 2001 | 26 | 19 |
| 2002 | 30 | 40 |
| 2003 | 41 | 38 |
| 2004 | 31 | 65 |
| 2005 | 12 | 61 |
| 2006 | 23 | 59 |
| 2007 | 22 | 114 |
| 2008 | 20 | 111 |
| 2009 | 32 | 118 |
| 2010 | 69 | 120 |
| 2011 | 89 | 138 |
| 2012 | 74 | 154 |
| 2013 | 106 | 176 |
| 2014 | 118 | 164 |
| 2015 | 129 | 177 |
| 2016 | 141 | 207 |
| 2017 | 175 | 208 |
| 2018 | 139 | 199 |
| 2019 | 218 | 191 |
| 2020 | 164 | 209 |
| 2021 | 169 | 226 |
| 2022 | 160 | 179 |
| 2023 | 152 | 208 |
| 2024 | 147 | 200 |
| 2025 | 132 | 160 |
| 2026 | 84 | 103 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- A61M 5/31513Piston constructions to improve sealing or sliding675
- A61M 5/31515Connection of piston with piston rod631
- A61M 2005/31518Designed to reduce the overall size of an injection deviceIndexing code406
- A61M 2005/3152Including gearings to multiply or attenuate the piston displacing forceIndexing code269
- A61M 2005/31516Reducing dead-space in the syringe barrel after deliveryIndexing code226
- A61M 2005/31521Pistons with a forward extending skirt at their front endIndexing code50
- A61M 2005/31523For reducing refluxIndexing code30
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Most cited
By later US patents
- Hypodermic syringe with protective shield1,132US 5,222,945 A1993
- Removable controller for an infusion pump756US 7,981,102 B2Asante Solutions, Inc. · 2011
- Medication infusion pump with flexible drive plunger734US 5,637,095 AMiniMed Inc. · 1997
- Needleless hypodermic injection device732US 5,383,851 ABioject, Inc. · 1995
- Plunger assembly for patient infusion device658US 6,723,072 B2Insulet Corporation · 2004