# US 11,432,842 B2 · Cannula

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- Number: US 11,432,842 B2
- Document ID: US11432842B2
- Status: Granted
- Kind: B2
- Application number: 16/071,082
- Filed: 2017-01-18
- Published: 2021-07-08
- Granted: 2022-09-06
- Earliest claimed: 2016-01-19
- Assignees: Mani, Inc.
- Applicants: MANI, Inc.
- Inventors: Etsuo Murakami; Masanori Oshino
- Web page: https://patentgrep.com/patent/US11432842B2

## CPC

- A61B 17/3421: {Cannulas}
- A61F 9/007: Methods or devices for eye surgery
- A61B 17/00234: {for minimally invasive surgery (A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence)}
- A61B 17/3462: {with means for changing the diameter or the orientation of the entrance port of the cannula, e.g. for use with different-sized instruments, reduction ports, adapter seals (expandable cannulas A61B17/3417)}
- A61B 2017/00238: {Type of minimally invasive operation (A61B2017/00805 takes precedence)}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

There is provided a cannula that suppresses leakage of vitreous humor, etc., from a slit through which a surgical tool is inserted. A cannula (10) used for piercing through an eyeball during an ophthalmic operation, includes: a pipe (11); a cylindrical base (12) fitted together with the circumference of a base end of the pipe (11); a resin cap (13) including a cover surface (13c) covering the surface of the base end of the pipe (11) and a side surface (13a) covering a cylindrical side surface of the base (12); and a slit (13d) passing through the center of the cover surface (13c). The outer diameter of the cylindrical side surface of the base (12) at a position where the cylindrical side surface of the base (12) touches the side surface (13a) of the cap is larger than the inner diameter of the side surface of the cap.

## Claims

### Claim 1

A cannula for piercing an eyeball during an ophthalmic operation, comprising:
a pipe;
a cylindrical base fitted together with a circumference of a base end of the pipe;
a resin cap comprising a cover surface covering a surface of the base end of the pipe and a side surface covering a cylindrical side surface of the base; and
a slit passing through a center of the cover surface, wherein
an outer diameter of the cylindrical side surface of the base at a position where the cylindrical side surface of the base touches the side surface of the cap is larger than an inner diameter of the side surface of the cap,
the slit is linear,
the outer diameter of the cylindrical side surface of the base orthogonal to the slit is larger than the inner diameter of the side surface of the cap, and
the outer diameter of the cylindrical side surface of the base orthogonal to the slit is larger than the outer diameter of the cylindrical side surface of the base parallel to a length of the slit.

### Claim 2 (depends on 1)

The cannula of claim 1, wherein the base comprises a groove along a circumference of the cylindrical side surface,
the cap comprises a locking part fitted together with the groove so as to touch a groove bottom surface of the groove,
the outer diameter of the cylindrical side surface of the base is an outer diameter of the groove bottom surface, and
the inner diameter of the side surface of the cap is an inner diameter of the locking part.