# US 12,758,130 B2 · Simple head pressing type disposable safety lancet

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,758,130 B2
- Document ID: US12758130B2
- Status: Granted
- Kind: B2
- Application number: 18/696,166
- Filed: 2022-09-27
- Published: 2024-12-05
- Granted: 2026-10-13
- Earliest claimed: 2021-09-28
- Assignees: Sterilance Medical (Suzhou) Inc.
- Applicants: Sterilance Medical (Suzhou) Inc.
- Inventors: Guoping Shi; Anthony Scott Horstman; Xiangsheng Wang; Jinquan Zhang
- Web page: https://patentgrep.com/patent/US12758130B2

## CPC

- A61B 5/15142: {Devices intended for single use, i.e. disposable}
- A61B 5/15113: {Manually triggered, i.e. the triggering requires a deliberate action by the user such as pressing a drive button}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A safety lancet includes a housing, a needle core, a pusher and a launching spring, the front end of the needle core having a protective rod, the side of the needle core having an elastic arm having a protrusion; a sliding platform is provided for the protrusion on the inner wall of the housing, and the front end face of the sliding platform is the triggering surface for triggering launching the lancet, and the tabletop of the sliding platform is a sliding surface in the length direction of the lancet; the distance of the decoupling point of the projection relative to the center of the lancet is greater than or equal to the distance of the sliding surface relative to the center of the lancet; a stopper is on the protection rod, and corresponding to the stopper a second limit surface is on the inner wall of the pusher.

## Claims

### Claim 1

A safety lancet, comprising a housing, a needle core, a pusher and a launching spring, a direction to which a needle tip of the lancet points being defined as a front of the lancet; wherein:
a front end of the needle core is equipped with a protective rod, and a side of the needle core is equipped with an elastic arm;
the elastic arm is provided with a first blocking surface and a resisting surface, the pusher is provided with a second blocking surface, and the second blocking surface cooperates with the first blocking surface to restrict a forward movement of the needle core in relation to the pusher;
a triggering surface is provided on an inner wall of the housing, and the triggering surface cooperates with the resisting surface to force the elastic arm to bend towards a longitudinal axis of the lancet;
a first limiting surface is provided on an outer side of the pusher, a locking bump is provided on the inner wall of the housing, and the locking bump cooperates with the first limiting surface to limit a forward movement of the pusher relative to the housing;
a sliding platform is provided for the resisting surface on the inner wall of the housing, a front end face of the sliding platform is the triggering surface, and a top of the sliding platform forms a sliding surface in a length direction of the lancet;
the second blocking surface has a decoupling point that matches the first blocking surface on the elastic arm, a needle body of the lancet is a center of the lancet in a cross-sectional view, and a distance between the decoupling point and the center is greater than or equal to a distance between the sliding surface and the center;
the protective rod is provided with an obstructing surface, a second limiting surface is provided on an inner wall of the pusher, and the second limiting surface cooperates with the obstructing surface to limit a forward movement of the needle core relative to the pusher.

### Claim 2 (depends on 1)

The safety lancet according to claim 1, wherein:
the elastic arm is equipped with a protrusion, a front end face of the protrusion is the first blocking surface, and a rear end face of the protrusion is the resisting surface;
in an initial assembly state of the lancet, the housing is sleeved outside the pusher, a front end of the pusher protrudes out of an opening at a front end of the housing, the needle core is located inside the housing and is slidable relative to the pusher, the protective rod at the front end of the needle core is located inside the pusher, a front end of the protective rod protrudes out of a needle-tip puncture hole at the front end of the pusher, and the launching spring acts in an ejection direction between the needle core and the housing;
in the initial assembly state of the lancet, the second blocking surface of the pusher is located in front of the protrusion of the elastic arm, and the triggering surface on the inner wall of the housing and the sliding surface are located behind the protrusion of the elastic arm, so that the protrusion is located between the second blocking surface and the sliding platform; and
when the protective rod or the pusher is accidentally triggered, a triggering force forces the needle core to move backward relative to the housing, compressing the launching spring, while the protrusion on the elastic arm slides backward along the triggering surface to the sliding surface, until it stops sliding, and when the triggering force is eliminated, under an action of the launching spring, the protrusion on the elastic arm slides along the sliding surface forward to a position between the second blocking surface and the sliding platform, restoring the needle core to a position of the needle core in to the initial assembly state of the lancet.

### Claim 3 (depends on 2)

The safety lancet according to claim 2, wherein: in the initial assembly state of the lancet, the launching spring is in a pre-compressed state, the pre-compressed state of the launching spring simultaneously forcing the obstructing surface of the protective rod against the second limiting surface of the pusher, and forcing the first limiting surface of the pusher against the locking bump of the housing.

### Claim 4 (depends on 1)

The safety lancet according to claim 1, wherein: the sliding surface is a flat surface which is parallel to an ejection direction of the lancet.

### Claim 5 (depends on 1)

The safety lancet according to claim 1, wherein: the resisting surface is a straight surface or a beveled surface or a curved surface.

### Claim 6 (depends on 1)

The safety lancet according to claim 1, wherein: the needle core is provided with an impact surface, which is oriented towards the front of the lancet, the pusher is provided with a third limiting surface, which is oriented towards a rear of the lancet, and during a launching process of the needle core, the impact surface cooperates with the third limiting surface to limit a puncture depth of the lancet.

### Claim 7 (depends on 1)

The safety lancet according to claim 1, wherein: the protective rod includes a stopper that includes the obstructing surface, a notch for the stopper to pass through is provided on the pusher next to a needle-tip puncture hole of the pusher, and in an initial assembly state of the lancet, the notch is located in a rotational position in which the stopper is rotated with the protective rod.

### Claim 8 (depends on 1)

The safety lancet according to claim 1, wherein: the elastic arm is of an arch bridge type elastic arm structure.

### Claim 9 (depends on 1)

The safety lancet according to claim 1, wherein: a twist cap or cover cap is provided, the twist cap or cover cap being set on a head of the pusher in an initial assembly state of the lancet.

### Claim 10 (depends on 1)

The safety lancet according to claim 1, wherein: the housing is a one-piece molded structure, with guiding bevels on both sides of a rear portion of the inside of the housing for guiding installation of the launching spring, and a spring-connecting post for locating the launching spring is provided at a rear end of the housing.