# US 2024/0197367 A1 · Bone screw and sleeve remover

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- Number: US 2024/0197367 A1
- Document ID: US20240197367A1
- Status: Published application
- Kind: A1
- Application number: 18/286,604
- Filed: 2021-05-10
- Published: 2024-06-20
- Earliest claimed: 2021-05-10
- Assignees: Ulrich GmbH & Co. KG
- Applicants: Ulrich GmbH & Co. KG
- Inventors: Stefan MIDDERHOFF; Michael FROMM; Frauke ZIMMERMANN
- Web page: https://patentgrep.com/patent/US20240197367A1

## CPC

- A61B 17/702: {having a core or insert, and a sleeve, whereby a screw or hook can move along the core or in the sleeve}
- A61B 17/7032: {Screws or hooks with U-shaped head or back through which longitudinal rods pass}
- A61B 17/8863: {Apparatus for shaping or cutting osteosynthesis equipment by medical personnel}
- A61B 2090/037: {with a frangible part, e.g. by reduced diameter}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A bone screw has a threaded screw shank and a screw head that in turn has two opposite legs defining a receptacle between them and integrally connected to a tissue-protecting sleeve. The tissue-protecting sleeve has a slot that runs from the sleeve's one edge to the opposite edge. Further, a sleeve remover has a corpus structured as a hollow cylinder, which has a separation element at one end, on its inside circumference, which element extends over part of the circumference direction.

## Claims

### Claim 1

A bone screw (1) having a screw shank (2) that has a thread, and having a screw head (3) that has two legs (5) that lie opposite one another and form a receptacle (4) between them, which are connected, in one piece, with a tissue-protecting sleeve (8), wherein the tissue-protecting sleeve has a slot (9) that extends from its one edge all the way to the opposite edge.

### Claim 2 (depends on 1)

The bone screw (1) according to claim 1, wherein the legs (5) of the screw head (3) are connected with the tissue-protecting sleeve (8) by way of a planned breaking point (7).

### Claim 3 (depends on 1)

The bone screw (1) according to claim 1, wherein the tissue-protecting sleeve (8) has a stabilization bracket (10) on the edge opposite to the legs (5).

### Claim 4 (depends on 1)

The bone screw (1) according to claim 1, wherein the tissue-protecting sleeve (8) has an opening (11) on the side opposite the slot (9), which opening extends from the edge facing the leg (5), over part of the longitudinal expanse of the tissue-protecting sleeve (8).

### Claim 5 (depends on 1)

The bone screw (1) according to claim 1, wherein the tissue-protecting sleeve (8) is circular in cross-section and the slot (9) extends over an arc having a length between 15° and 90°.

### Claim 6 (depends on 1)

The bone screw (1) according to claim 1, wherein a sleeve remover (12) that can be placed over the tissue-protecting sleeve (8) is provided, which remover has a separation element (14) on its inside circumference, in the configuration placed onto the tissue-protecting sleeve (8), at its end (13) that faces the legs (5), the expanse of which element, which lies in the circumference direction, is smaller than the expanse of the slot (9), which lies in the circumference direction.

### Claim 7 (depends on 6)

The bone screw (1) according to claim 6, wherein the separation element (14) is configured as a blade.

### Claim 8 (depends on 6)

The bone screw (1) according to claim 6, wherein the sleeve remover (12) has a drive opening (16) on its circumference.

### Claim 9 (depends on 8)

The bone screw (1) according to claim 8, wherein the drive opening (16) is arranged on the end that faces away from the legs (5) and/or on the side opposite the separation element (14).

### Claim 10 (depends on 6)

The bone screw (1) according to claim 6, wherein a rod (6) can be placed in the receptacle (4) between the legs (5), and wherein the separation element (14) is so far away from the end (13) of the sleeve remover (12) that the separation element (14) is assigned to the planned breaking point (7) when the end (13) lies on the rod (6).

### Claim 11 (depends on 2)

The bone screw (1) according to claim 2, wherein an inside thread (18) for accommodating a fixation screw (17) is formed on the inside of the legs (5), which thread lies below the planned breaking point (7).

### Claim 12

A sleeve remover (12) having a corpus (15) structured as a hollow cylinder, which has a separation element (14) at one end, on its inside circumference, which element extends over part of the circumference direction.

### Claim 13 (depends on 12)

The sleeve remover (12) according to claim 12, wherein the separation element (14) is configured as a blade.

### Claim 14 (depends on 12)

The sleeve remover (12) according to claim 12, wherein the corpus (15) has a drive opening (16) in its circumference.