# US 11,026,721 B2 · Medical needle with protector

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- Number: US 11,026,721 B2
- Document ID: US11026721B2
- Status: Granted
- Kind: B2
- Application number: 16/094,516
- Filed: 2017-03-17
- Published: 2019-05-09
- Granted: 2021-06-08
- Earliest claimed: 2016-04-26
- Assignees: Kabushiki Kaisha Top
- Applicants: Kabushiki Kaisha Top
- Inventors: Daisuke Nakagawa; Sho Takayanagi; Dai Takahashi
- Web page: https://patentgrep.com/patent/US11026721B2

## CPC

- A61B 17/3496: {Protecting sleeves or inner probes; Retractable tips (for protecting body piercing guide needles A61M25/0612)}
- A61M 5/158: Needles {for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body}
- A61M 5/1626: {Needle protectors therefor (in combination with syringes A61M5/3202; protectors for sharps A61B50/3001)}
- A61M 5/32: Needles; Details of needles pertaining to their connection with syringe or hub (infusion needles A61M5/158); Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M 5/3293: {characterised by features of the needle hub}
- A61B 2017/347: {Locking means, e.g. for locking instrument in cannula}
- A61B 2017/3492: {against the outside of the body}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

A medical needle with a protector (1) includes: a hub (3) that supports a needle tube (2); a protector (4) capable of storing the needle tube (2); a first lock unit (42a, 42b, 73) that locks the hub (3) to the protector (4) capable of unlocking; and a second lock unit (43, 44, 74, 75) that locks the hub (3) to the protector (4) incapable of unlocking. The hub front end has a pair of first protrusion portions (74) in the vertical direction and a pair of second protrusion portions (75) in the horizontal direction. The protector rear end has a pair of protrusion pieces (43) in the horizontal direction and a pair of side wall portions (44) in the vertical direction. The space between the side wall portions (44) is the width of the protrusion portions (74 and 75) or larger and the height of the same or smaller.

## Claims

### Claim 1

A medical needle with a protector comprising:
a cylindrical hub at a front end supporting a rear end of a needle tube;
a cylindrical protector that is capable of storing the needle tube inside;
a first lock unit that locks the hub to the protector in a manner capable of unlocking with the needle tube protruded from the protector; and
a second lock unit that locks the hub to the protector in a manner incapable of unlocking with the needle tube stored in the protector,
wherein
the hub comprises:
a small cylindrical portion into which a rear end of the needle tube is inserted on a front side;
a pair of first protrusion portions that is provided at a front end of the small cylindrical portion, and projects in a direction of a first axial line orthogonal to an axial line of the small cylindrical portion and is individually protruded in a direction away from an outer peripheral surface of the small cylindrical portion; and
a pair of second protrusion portions that is provided at a front end of the small cylindrical portion at a first predetermined space from the first protrusion portions to a rear end side of the small cylindrical portion, and projects in a direction of a second axial line that is orthogonal to the axial line of the small cylindrical portion and crosses the first axial line at a predetermined angle,
the protector comprises:
a large cylindrical portion to which the small cylindrical portion is capable of sliding inside;
a pair of protrusion pieces that is provided at a rear end of the large cylindrical portion on a third axial line orthogonal to an axial line of the large cylindrical portion, each protrusion piece extending from an inner peripheral surface of the large cylindrical portion toward the axial line of the large cylindrical portion while inclining toward a rear end side of the large cylindrical portion, and being elastically deformable in a direction away from the axial line of the large cylindrical portion; and
a pair of side wall portions that is provided on the inner peripheral surface of the large cylindrical portion with a second predetermined space equal to or smaller than the first predetermined space from the protrusion pieces of the large cylindrical portion to a front end side of the large cylindrical portion and is opposed to each other on a fourth axial line that is orthogonal to the axial line of the large cylindrical portion and crosses the third axial line at the predetermined angle,
the second lock unit is configured such that, front end sides of the side wall portions of the protector are locked to the first protrusion portions and rear end sides of the protrusion pieces are locked to the second protrusion portions, so as to lock the hub to the protector, and
a space between the pair of side wall portions is set to be;
equal to or larger than a maximum length in the direction of the second axial line of a portion of the small cylindrical portion that is provided with the first protrusions;
equal to or larger than a maximum length in the direction of the first axial line of a portion of the small cylindrical portion that is provided with the second protrusions;
smaller than a maximum length in the direction of the first axial line of a portion of the small cylindrical portion that is provided the first protrusions; and
smaller than maximum length in the direction of the second axial line of a portion of the small cylindrical portion that is provided the second protrusions.

### Claim 2 (depends on 1)

The medical needle with the protector according to claim 1, wherein
the outer peripheral surface of the small cylindrical portion has a streak along the axial line of the small cylindrical portion, and
the side wall portions have a slit through which the streak passes.

### Claim 3 (depends on 2)

The medical needle with the protector according to claim 2, wherein
each of the side wall portions are formed from a pair of plate spring members elastically deformable in a direction in which the side wall portions are separated from the axial line of the large cylindrical portion, and
the slit is formed by separating the opposing protrusion ends of the plate spring members from each other at a predetermined distance.

### Claim 4 (depends on 1)

The medical needle with the protector according to claim 1, wherein
the hub comprises a pair of auxiliary protrusion portions that is provided at a portion of the small cylindrical portion that is provided with the first protrusions, the pair of auxiliary protrusion portions project in the direction of the second axial line that is orthogonal to the axial line of the small cylindrical portion.