# US 12,108,965 B2 · Minimally invasive subdural evacuating system

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- Number: US 12,108,965 B2
- Document ID: US12108965B2
- Status: Granted
- Kind: B2
- Application number: 17/376,645
- Filed: 2021-07-15
- Published: 2021-11-04
- Granted: 2024-10-08
- Earliest claimed: 2019-07-02
- Assignees: MUSC Foundation for Research Development
- Applicants: MUSC Foundation for Research Development
- Inventors: Stephen Kalhorn; Ryan Kellogg; Joe Ruscito
- Web page: https://patentgrep.com/patent/US12108965B2

## CPC

- A61B 17/3423: {Access ports, e.g. toroid shape introducers for instruments or hands (access sites for liquids A61M39/0247)}
- A61B 90/10: for stereotaxic surgery, e.g. frame-based stereotaxis
- A61B 17/00234: {for minimally invasive surgery (A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence)}
- A61B 17/1695: {Trepans or craniotomes, i.e. specially adapted for drilling thin bones such as the skull}
- A61B 17/320016: {Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes (A61B10/0233, A61B17/29, A61B17/3207 take precedence)}
- A61B 17/3496: {Protecting sleeves or inner probes; Retractable tips (for protecting body piercing guide needles A61M25/0612)}
- A61B 2017/3425: {for internal organs, e.g. heart ports}
- A61B 2017/3456: {blunt}
- A61B 2090/034: {abutting on parts of the device itself}
- A61B 2090/062: {penetration depth}
- A61B 2090/103: {Cranial plugs for access to brain}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

The present invention provides minimally invasive subdural evacuating systems and methods of use thereof. The subdural evacuating systems include a cutting component and a rod component, wherein the rod component provides an external physical indicator that the surface of the dura mater has been reached, permitting the cutting component to accurately pierce the dura mater with minimal to no risk of damaging any adjacent anatomy.

## Claims

### Claim 1

An apparatus for cutting tissue through a port comprising:
a cannula comprising a substantially elongate body and a distal cutting end;
a position indicator configured to indicate a position of the cutting end in relation to a tissue to be cut; and
a depth stop configured to control a depth of the cutting end in relation to the tissue to be cut.

### Claim 2 (depends on 1)

The apparatus of claim 1 further comprising:
a port, wherein the port further comprises a distal threaded end and a lumen extending between a proximal opening and a distal opening.

### Claim 3 (depends on 2)

The apparatus of claim 2 wherein:
the cannula has a height that is greater than a height of the port, and
the cannula is sized to fit within the lumen of the port.

### Claim 4 (depends on 3)

The apparatus of claim 3 wherein:
the cannula has an outer diameter that is sized to fit substantially flush with the lumen of the port.

### Claim 5 (depends on 3)

The apparatus of claim 3 wherein:
the cutting end of the cannula is held in place relative to the port and the tissue to be cut by a spring force.

### Claim 6 (depends on 5)

The apparatus of claim 5 wherein:
the spring force can be provided by a coil spring, a disc spring, a wave spring, or a gas spring.

### Claim 7 (depends on 1)

The apparatus of claim 1 wherein:
the cannula is configured to be advanced between a proximal and distal position by rotational movement of the cannula.

### Claim 8 (depends on 1)

The apparatus of claim 1 wherein:
the cannula comprises one or more slots and depth markers on an outer surface.

### Claim 9 (depends on 1)

The apparatus of claim 1 wherein:
the tissue to be cut is a dura mater.

### Claim 10 (depends on 1)

The apparatus of claim 1 wherein:
actuating the apparatus rotates and advances the cannula in a distal direction to pierce the tissue.