# US 12,178,422 B2 · Programmable stiffness tissue displacement device

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- Number: US 12,178,422 B2
- Document ID: US12178422B2
- Status: Granted
- Kind: B2
- Application number: 17/894,861
- Filed: 2022-08-24
- Published: 2022-12-22
- Granted: 2024-12-31
- Earliest claimed: 2017-06-23
- Assignees: The Regents of the University of California
- Applicants: The Regents of the University of California
- Inventors: Shanglei Liu; Mohamad Ramzi Abdul Majit; Santiago Horgan; Michael Tolley; William Weston-Dawkes; Esmeralda Ochoa
- Web page: https://patentgrep.com/patent/US12178422B2

## CPC

- A61B 17/0218: {for minimally invasive surgery (A61B17/0281, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence)}
- A61B 2017/00544: {pneumatically}
- A61B 2017/00557: {inflatable (A61B2017/22051 takes precedence)}
- A61B 2017/00566: {fixation of form upon application of vacuum}
- A61B 2017/00858: {high friction or non-slip}
- A61B 2017/00946: {malleable}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A retraction device, e.g., a programmable stiffness state tissue displacement device, for providing increased visibility during an operation is provided. The device includes one or more strips of compliant jammable layer components connected in parallel, and encapsulated within a flexible envelope such that each of the one or more strips of compliant jammable layer components are pneumatically connected. The device further includes a negative pressure pump coupled to the flexible envelope, such that the application of negative pressure to the flexible envelope by the negative pressure pump causes the one or more strips of compliant jammable layer components to jam and thereby transition the retraction device from a malleable state to a rigid state.

## Claims

### Claim 1

A method for providing increased visibility during an operation, the method comprising:
introducing a retraction device in a delivery state to an operation site in a patient, the retraction device comprising one or more strips of compliant jammable layer components, the one or more strips of compliant jammable layer components connected in parallel and encapsulated within a flexible envelop;
manipulating the one or more strips of compliant jammable layer components to a desired shape; and
applying negative pressure to the flexible envelope to jam the one or more strips of compliant jammable layer components, such that the retraction device transitions from a malleable state to a rigid state,
wherein the retraction device, in the rigid state, comprises a stiffness sufficient to retract an anatomical structure of the patient to provide increased visibility of the operation site during the operation.

### Claim 2 (depends on 1)

The method of claim 1, wherein the retraction device further comprises an inflatable positive pressure chamber disposed along at least a portion of the retraction device adjacent the flexible envelope.

### Claim 3 (depends on 2)

The method of claim 2, further comprising applying positive pressure to the inflatable positive pressure chamber after introducing the retraction device, such that the retraction device transitions from the delivery state to an expanded state.

### Claim 4 (depends on 3)

The method of claim 3, further comprising deflating the inflatable positive pressure chamber prior to manipulating the one or more strips of compliant jammable layer components to the desired shape.

### Claim 5 (depends on 2)

The method of claim 2, further comprising applying positive pressure to the inflatable positive pressure chamber after manipulating the one or more strips of compliant jammable layer components to the desired shape to increase normal forces on a surface of the retraction device, thereby increasing friction forces between the retraction device and the anatomical structure of the patient.

### Claim 6 (depends on 5)

The method of claim 5, further comprising deflating the inflatable positive pressure chamber after applying negative pressure to the flexible envelope, thereby providing stronger retraction of the anatomical structure of the patient during the operation.

### Claim 7 (depends on 2)

The method of claim 2, wherein the retraction device comprises a tapered end portion configured to facilitate introduction through a trocar, the method further comprising removing the retraction device by pulling the retraction device through the trocar via the tapered end portion.